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Insulation and refractory is a second part of Energy Conservation Subject Course work
Steam distribution system, utilization and designAzmir Latif Beg
n any steam plant or any process plant effectiveness of steam distribution system is dependent upon the project specific conditions like location and layout of the process plant and its steam consuming equipment like heat exchangers, decorators etc. Steam distribution circuit is one of the major link between the steam production point and the point of end use i.e. process plant. Primary steam generating source are co-generation plant and Steam generators. However it not the source of steam generation but the effective and efficient steam distribution system that decides right quality (pressure and temperature) and quantity of steam to reach to the process through it. Thus designing of steam distribution is to be given due importance along with installation and subsequently maintenance during operation.
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
Steam distribution system, utilization and designAzmir Latif Beg
n any steam plant or any process plant effectiveness of steam distribution system is dependent upon the project specific conditions like location and layout of the process plant and its steam consuming equipment like heat exchangers, decorators etc. Steam distribution circuit is one of the major link between the steam production point and the point of end use i.e. process plant. Primary steam generating source are co-generation plant and Steam generators. However it not the source of steam generation but the effective and efficient steam distribution system that decides right quality (pressure and temperature) and quantity of steam to reach to the process through it. Thus designing of steam distribution is to be given due importance along with installation and subsequently maintenance during operation.
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
Insulation _refractories,Purpose of Insulation,Types and Application,Economic Thickness of Insulation (ETI). Simplified Formula for Heat Loss Calculation, Refractories, Properties of Refractories,Classification of Refractories,Selection of Refractories, Heat Losses from Furnace Walls
00923006902338
Solar collector : A device designed to absorb incident solar radiation and to transfer the energy to a fluid passing in contact with it, usually liquid or air.
Flat – Plate Collector : A typical flat-plate collector is an insulated metal box with a glass or plastic cover (called the glazing) and a dark-colored absorber plate. These collectors heat liquid or air at temperatures less than 180°F.
Waste heat recovery, co geration and tri-generationAmol Kokare
Diploma in Mechanical Engg.
Babasaheb Phadtare Polytechnic, kalamb-walchandnagar
Sub- Power plant engineering
Unit-Waste heat recovery, co geration and tri-generation.
By- Prof. Kokare Amol Yashwant
Aircraft refrigeration system (air cooling system)Ripuranjan Singh
Aircraft air refrigeration systems are required due to heat transfer from many external and internal heat sources (like solar radiation and avionics) which increase the cabin air temperature. With the technological developments in high-speed passenger and jet aircraft's, the air refrigeration systems are proving to be most efficient, compact and simple. Various types of aircraft air refrigeration systems used these days are.
Simple air cooling system
Simple air evaporative cooling system
Boot strap air cooling system
Boot strap air evaporative cooling system
Reduced ambient air cooling system
Regenerative air cooling system
COMPRESSOR EFFICIENCY AND TURBINE EFFICIENCY.
Comparison of Various Air Cooling Systems used for Aircraft ON basis of dart
The ppt contains detailed study of Vapor Absorption Refrigeration System with neat sketches and description. It is well formed as per the syllabus of GTU
It is basic information about what is critical thickness and why we should we know this. Then there is critical thickness formula for cylindrical pipe and spherical shell.
This presentation explains how to improve energy efficiency of industrial furnaces. It was prepared for energy auditor training in Nepal in the context of GIZ/NEEP programme. For further information go to EEC webpage: http://www.eec-fncci.org
Insulation _refractories,Purpose of Insulation,Types and Application,Economic Thickness of Insulation (ETI). Simplified Formula for Heat Loss Calculation, Refractories, Properties of Refractories,Classification of Refractories,Selection of Refractories, Heat Losses from Furnace Walls
00923006902338
Solar collector : A device designed to absorb incident solar radiation and to transfer the energy to a fluid passing in contact with it, usually liquid or air.
Flat – Plate Collector : A typical flat-plate collector is an insulated metal box with a glass or plastic cover (called the glazing) and a dark-colored absorber plate. These collectors heat liquid or air at temperatures less than 180°F.
Waste heat recovery, co geration and tri-generationAmol Kokare
Diploma in Mechanical Engg.
Babasaheb Phadtare Polytechnic, kalamb-walchandnagar
Sub- Power plant engineering
Unit-Waste heat recovery, co geration and tri-generation.
By- Prof. Kokare Amol Yashwant
Aircraft refrigeration system (air cooling system)Ripuranjan Singh
Aircraft air refrigeration systems are required due to heat transfer from many external and internal heat sources (like solar radiation and avionics) which increase the cabin air temperature. With the technological developments in high-speed passenger and jet aircraft's, the air refrigeration systems are proving to be most efficient, compact and simple. Various types of aircraft air refrigeration systems used these days are.
Simple air cooling system
Simple air evaporative cooling system
Boot strap air cooling system
Boot strap air evaporative cooling system
Reduced ambient air cooling system
Regenerative air cooling system
COMPRESSOR EFFICIENCY AND TURBINE EFFICIENCY.
Comparison of Various Air Cooling Systems used for Aircraft ON basis of dart
The ppt contains detailed study of Vapor Absorption Refrigeration System with neat sketches and description. It is well formed as per the syllabus of GTU
It is basic information about what is critical thickness and why we should we know this. Then there is critical thickness formula for cylindrical pipe and spherical shell.
This presentation explains how to improve energy efficiency of industrial furnaces. It was prepared for energy auditor training in Nepal in the context of GIZ/NEEP programme. For further information go to EEC webpage: http://www.eec-fncci.org
Introduction to hydraulics and pneumatic by Varun Pratap SinghVarun Pratap Singh
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This file contains basic information about hydraulics and pneumatic systems.
Hydraulics & Pneumatics is a part of the Ahuja Group and is based in Jaipur, India. Established in 1970, we focus on supplying the latest in Industrial Automation Products, Supplies and Services and have established a name in the global market for the quality and technology of our products and excellent after sale service. Since the company is continually improving and has become one of the major player in the market today with thousands of valued customers.
Although all Textiles will burn, some are naturally more resistant to fire than others. Those that are more flammable can have their fire resistance drastically improved by treatment with fire retardant chemicals called flame Retardant Textiles.
Automation in Manufacturing (Unit-1) by Varun Pratap Singh.pdfVarun Pratap Singh
Unit 1: Production systems
Categories of manufacturing systems, manufacturing support systems, automation in production systems, automated manufacturing systems, opportunities for automation and computerization, types of automation, computerized manufacturing support systems, reasons for automating, automation principles and strategies, the USA principle, ten strategies for automation, automation migration strategy.
Automation in Manufacturing (Unit-6) by Varun Pratap Singh.pdfVarun Pratap Singh
Unit 6: Flexible manufacturing systems
Introduction to FMS, types of FMS, FMS components, applications and benefits, planning and implementation issues in FMS, quantitative analysis of FMS.
Automation in Manufacturing (Unit-5) by Varun Pratap Singh.pdfVarun Pratap Singh
Unit 5: Cellular manufacturing
Group technology, part families, parts classification and coding, production flow analysis, Opitz coding system, composite part concept, machine cell design, applications of GT.
Automation in Manufacturing (Unit-4) by Varun Pratap Singh.pdfVarun Pratap Singh
Unit 4: Production and assembly systems
Automated production lines- fundamentals, system configurations, work part transfer mechanisms, storage buffers, control of production line, applications. Automated assembly systems- fundamentals, system configurations, parts delivery at work stations, applications.
Automation in Manufacturing (Unit-3) by Varun Pratap Singh.pdfVarun Pratap Singh
Unit 3: Material handling system
Material handling equipment, design considerations for material handling system, material transport equipment, analysis of material transport systems, storage systems and their performance and location strategies, conventional and automated storage systems, overview of automatic identification and data capture, bar code technology, RFID, other AIDC technologies.
Automation in Manufacturing (Unit-2) by Varun Pratap SinghVarun Pratap Singh
Unit 2: Automation and control technologies in production system
Basic elements of an automated system, advanced automation functions, levels of automation, continuous and discrete control systems, computer process control, common measuring devices used in automation, desirable features for selection of measuring devices.
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UNIT-5
Stress and Strain Analysis Simple stress and strain: Introduction, Normal shear stresses, Stress-strain diagrams for ductile and brittle materials, Elastic constants, One dimensional loading of members of varying cross section, Strain energy, Thermal stresses.
Compound stress and strains: Introduction, State of plane stress, Principal stress and strain, Mohr’s circle for stress and strain.
Pure Bending of Beams: Introduction, Simple bending theory, Stress in beams of different cross sections.
Torsion: Introduction, Torsion of Shafts of circular section, Torque and Twist, Shear stress due to Torque.
Basic mechanical engineering (BMET-101/102) unit 5 part-1 simple stress and ...Varun Pratap Singh
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UNIT-5
Stress and Strain Analysis Simple stress and strain: Introduction, Normal shear stresses, Stress-strain diagrams for ductile and brittle materials, Elastic constants, One dimensional loading of members of varying cross section, Strain energy, Thermal stresses.
Compound stress and strains: Introduction, State of plane stress, Principal stress and strain, Mohr’s circle for stress and strain.
Pure Bending of Beams: Introduction, Simple bending theory, Stress in beams of different cross sections.
Torsion: Introduction, Torsion of Shafts of circular section, Torque and Twist, Shear stress due to Torque.
Basic mechanical engineering (BMET-101/102) unit 4- part1 (force system and a...Varun Pratap Singh
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Unit-4 Part -1
Force system and Analysis
Basic concept: Review of laws of motion, transfer of force to parallel position, resultant of planer force system, Free-Body Diagrams, Equilibrium. Friction: Introduction, Laws of Coulomb friction, Equilibrium of bodies involving dry fiction.
Basic mechanical engineering (BMET-101/102) unit 4- part 3 (truss) by varun p...Varun Pratap Singh
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Unit-4 Part-3
Trusses: Introduction, Simple Trusses, Determination of forces in simple truss members, Method of Joints and Method of section.
Basic mechanical engineering (BMET-101/102) unit 4- part 2 (beams) by varun p...Varun Pratap Singh
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Unit4 Part-2
Force system and Analysis
Basic concept: Review of laws of motion, transfer of force to parallel position, resultant of planer force system, Free Body Diagrams, Equilibrium. Friction: Introduction, Laws of Coulomb friction, Equilibrium of bodies involving dry fiction.
Basic mechanical engineering (BMET-101/102) unit 3 (part-1) Properties of ste...Varun Pratap Singh
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Unit-3 Part-1
Properties of steam: Properties of steam, Phase transformation process and its graphical representation on P-V, T-V& T-s diagram, Mollier diagram and Steam Tables, Processes involving steam in closed and open systems.
Introduction to I.C. Engines: Two & four stoke S.I. and C.I. engines. Otto cycle, Diesel cycle, Dual cycle.
Basic mechanical engineering (BMET-101/102) unit 2 numerical by Varun Pratap ...Varun Pratap Singh
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UNIT-2: Zeroth law: Zeroth law, Different temperature scales and temperature measurement First law: First law of thermodynamics. Processes flow and non-flow, Control volume, Flow work and non-flow work, Steady flow energy equation, unsteady flow systems and their analysis. Second law: Limitations of first law of thermodynamics, Essence of second law, Thermal reservoir, Heat engines. COP of heat pump and refrigerator. Statements of second law and their equivalence, Carnot cycle, Carnot theorem, Thermodynamic temperature scale, Clausius inequality. Concept of entropy.
Basic mechanical engineering(BMET-101/102) unit 2 (part-2) thermodynamics law...Varun Pratap Singh
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UNIT-2: Part-2
Zeroth law: Zeroth law, Different temperature scales and temperature measurement
First law: First law of thermodynamics. Processes flow and non-flow, Control volume, Flow work and non-flow work, Steady flow energy equation, unsteady flow systems and their analysis.
Second law: Limitations of first law of thermodynamics, Essence of second law, Thermal
reservoir, Heat engines. COP of heat pump and refrigerator. Statements of second law and their equivalence, Carnot cycle, Carnot theorem, Thermodynamic temperature scale, Clausius
inequality. Concept of entropy.
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UNIT-2: Part-1
Zeroth law: Zeroth law, Different temperature scales and temperature measurement
First law: First law of thermodynamics. Processes flow and non-flow, Control volume, Flow work and non-flow work, Steady flow energy equation, unsteady flow systems and their analysis.
Second law: Limitations of first law of thermodynamics, Essence of second law, Thermal
reservoir, Heat engines. COP of heat pump and refrigerator. Statements of second law and their equivalence, Carnot cycle, Carnot theorem, Thermodynamic temperature scale, Clausius
inequality. Concept of entropy.
Power plant engineering unit 3 notes by Varun Pratap SinghVarun Pratap Singh
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Unit-3
Diesel power plant
General layout, performance of diesel engine, fuel system, lubrication system, air intake and admission system, supercharging system, exhaust system, diesel plant operation and efficiency, heat balance.
Gas turbine power plant
Elements of gas turbine power plants, Gas turbine fuels, cogeneration, auxiliary systems such as fuel, controls and lubrication, operation and maintenance, Combined cycle power plants.
Power plant engineering unit 2 notes by Varun Pratap SinghVarun Pratap Singh
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SYLLABUS
Unit-II
Steam power plant
Power plant boilers including critical and super critical boilers. Fluidized bed boilers, boilers
mountings and accessories.
General layout of steam power plant. Different systems such as fuel handling system,
pulverizes and coal burners, combustion system, draft, ash handling system, feed water
treatment and condenser and cooling system, turbine auxiliary systems such as governing, feed
heating, reheating, flange heating and gland leakage.
Operation and maintenance of steam power plant, heat balance and efficiency.
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1. To study the Cochran, Locomotive Fire-Tube Boiler, and Babcock & Wilcox Boilers.
2. To study the working & function of mountings and accessories in boilers.
3. To study 2-Stroke & 4-Stroke diesel engines.
4. To study 2-Stroke & 4-Stroke petrol engines.
5. To prepare a stress-strain diagram for mild steel and cast iron specimens under tension and compression respectively on a U.T.M.
6. To determine the Rockwell hardness no. of a specimen on the respective machines.
7. To determine the Brinell hardness no. of a specimen on the respective machines.
8. To determine the Impact strength of a specimen in the Izod & Charpy Test.
9. Study of refrigerator and refrigeration cycle
10. Study of Air Conditioner and its components
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Unit-I
Part-1 Introduction
Power and energy, sources of energy, review of thermodynamic cycles related to power plants,
fuels and combustion, calculations.
Part-2 Variable Load Problem
Industrial production and power generation compared ideal and realized load curves, terms, and factors. Effect of variable load on power plan operation, methods of meeting the variable load problem.
Part-3 Power plant economics and selection Effect of plant type on costs, rates, fixed elements, energy elements, customer elements, and investor’s profit; depreciation and replacement, theory of rates. Economics of plant selection, other considerations in plant selection.
Basic mechanical engineering unit 1 thermodynamics by varun pratap singh (202...Varun Pratap Singh
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Notes for Basic mechanical engineering subject unit 1 thermodynamics for Uttarakhand Technical University
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
2. CONTENT
• Refractory-
– Types,
– Selection
– Application of Refractoriness.
• Insulation
– Type
– Application,
– Economic Thickness of Insulation,
– Heat Savings and Application Criteria,
3. INSULATION
• A thermal insulator is a poor conductor of heat and has a low thermal
conductivity. Insulation is used in buildings and in manufacturing
processes to prevent heat loss or heat gain. Although its primary purpose
is an economic one, it also provides more accurate control of process
temperatures and protection of personnel. It prevents condensation on
cold surfaces and the resulting corrosion. Such materials are porous,
containing large number of dormant air cells.
• Thermal insulation delivers the following benefits:
– Reduces over-all energy consumption
– Offers better process control by maintaining process temperature.
– Prevents corrosion by keeping the exposed surface of a refrigerated system
above dew point
– Provides fire protection to equipment
– Absorbs vibration
4. INSULATION- Types and Application
• The Insulation can be classified into three groups according to the
temperature ranges for which they are used.
• Low Temperature Insulations (up to 90 °C)
• This range covers insulating materials for refrigerators, cold and hot water
systems, storage tanks, etc. The commonly used materials are Cork, Wood,
85% magnesia, Mineral Fibers, Polyurethane and expanded Polystyrene,
etc.
• Medium Temperature Insulations (90 – 325 °C)
• Insulators in this range are used in low temperature, heating and steam
raising equipment, steam lines, flue ducts etc. The types of materials used
in this temperatures range include 85% Magnesia, Asbestos, Calcium
Silicate and Mineral Fibers etc.
• High Temperature Insulations (325 °C – above )
• Typical uses of such materials are super heated steam system, oven dryer
and furnaces etc. The most extensively used materials in this range are
Asbestos, Calcium Silicate, Mineral Fibre, Mica and Vermiculite based
insulation, Fireclay or Silica based insulation and Ceramic Fibre.
5. Insulation Material- Classification
• Insulation materials can also be classified into organic and inorganic types. Organic insulations are based on hydrocarbon
polymers, which can be expanded to obtain high void structures
Example: Thermocol (Expanded Polystyrene) and Poly Urethane Form(PUF). Inorganic insulation is based on
Siliceous/Aluminous/Calcium materials in fibrous, granular or powder forms.
Example: Mineral wool, Calcium silicate etc.
Properties of common insulating materials are as under:
• Calcium Silicate:
• Used in industrial process plant piping where high service temperature and compressive strength are needed. Temperature
ranges varies from 40 °C to 950 °C.
• Glass mineral wool:
• These are available in flexible forms, rigid slabs and preformed pipe work sections. Good for thermal and acoustic insulation
for heating and chilling system pipelines. Temperature range of application is –10 to 500 °C.
• Thermocol:
• These are mainly used as cold insulation for piping and cold storage construction.
• Expanded nitrile rubber:
• This is a flexible material that forms a closed cell integral vapour barrier. Originally developed for condensation control in
refrigeration pipe work and chilled water lines; now-a-days also used for ducting insulation for air conditioning.
• Rock mineral wool:
• This is available in a range of forms from light weight rolled products to heavy rigid slabs including preformed pipe sections.
In addition to good thermal insulation properties, it can also provide acoustic insulation and is fire retardant.
• Use of Moulded Insulation
• Lagging materials can be obtained in bulk, in the form of moulded sections; semi - cylindrical for pipes, slabs for vessels,
flanges, valves etc. The main advantage of the moulded sections is the ease of application and replacement when undertaking
repairs for damaged lagging.
7. Calculation of Insulation Thickness
• The most basic model for insulation on a pipe is shown in Figure 5.2. r1 show the outside
radius of the pipe r2 shows the radius of the Pipe+ insulation.
• Heat loss from a surface is expressed as
• H = h X A x (Th–Ta)
• Where
• h = Heat transfer coefficient, W/m2–K
• H = Heat loss, Wattsantage of the moulded sections is the ease of application and replacement
when undertaking repairs for damaged lagging.
8. Calculation of Insulation Thickness
• Economic Thickness of Insulation (ETI)
• Insulation of any system means capital expenditure. Hence the most important factor in any Insulation
system is to analyse the thermal insulation with respect to cost. The effectiveness of insulation follows the
law of decreasing returns. Hence, there is a definite economic limit to the amount of insulation, which is
justified. An increased thickness is uneconomical and cannot be recovered through small heat savings. This
limiting value is termed as economic thickness of insulation. An illustrative case is given in Figure 5.3.
Each industry has different fuel cost and boiler efficiency. These values can be used for calculating
economic thickness of insulation. This shows that thickness for a given set of circumstances results in the
lowest overall cost of insulation and heat loss combined over a given period of time. The following Figure
5.4 illustrates the principle of economic thickness of insulation. The simplest method of analysing whether
you should use 1" or 2" or 3" insulation is by comparing the cost of energy losses with the cost of insulating
the pipe. The insulation thickness for which the total cost is minimum is termed as economic thickness.
Figure shows the curve representing the total cost reduces initially and after reaching the economic
thickness corresponding to the minimum cost, it increases.
9. Economic Thickness of Insulation (ETI)
• Economic Thickness of Insulation (ETI)
• The determination of economic thickness requires the attention to the following factors.
i. Cost of fuel
ii. Annual hours of operation
iii. Heat content of fuel
iv. Boiler efficiency
v. Operating surface temperature
vi. Pipe diameter/thickness of surface
vii. Estimated cost of insulation.
viii. Average exposure ambient still air temperature
10. Procedure for Calculating E.T. of Insulation
• To explain the concept of economic thickness of insulation, we will use an example. Consider an 8 bar steam pipeline of 6"
dia having 50-meter length. We will evaluate the cost of energy losses when we use 1", 2" and 3" insulation to find out the
most economic thickness.
• A step-by-step procedure is given below.
• 1. Establish the bare pipe surface temperature, by measurement.
• 2. Note the dimensions such as diameter, length & surface area of the pipe section under consideration.
• 3. Assume an average ambient temperature. Here, we have taken 30 °C.
• 4. Since we are doing the calculations for commercially available insulation thickness, some trial and error calculations will
be required for deciding the surface temperature after putting insulation. To begin with assume a value between 55 & 65 °C,
which is a safe, touch temperature.
• 5. Select an insulation material, with known thermal conductivity values in the mean insulation temperature range. Here the
mean temperature is 111 °C. and the value of k = 0.044 W/m2°C for mineral wool.
• 6. Calculate surface heat transfer coefficients of bare and insulated surfaces, using equations discussed previously. Calculate
the thermal resistance and thickness of insulation.
• 7. Select r2 such that the equivalent thickness of insulation of pipe equals to the insulation thickness estimated in step 6.
From this value, calculate the radial thickness of pipe insulation = r2-r1
• 8. Adjust the desired surface temperature values so that the thickness of insulation is close to the standard value of 1" ( 25.4
mm).
• 9. Estimate the surface area of the pipe with different insulation thickness and calculate
• the total heat loss from the surfaces using heat transfer coefficient, temperature difference between pipe surface and ambient.
• 10. Estimate the cost of energy losses in the 3 scenarios. Calculate the Net Present Value of the future energy costs during an
insulation life of typically 5 years.
• 11. Find out the total cost of putting insulation on the pipe ( material + labor cost)
• 12. Calculate the total cost of energy costs and insulation for 3 situations.
• 13. Insulation thickness corresponding to the lowest total cost will be the economic thickness of insulation.
13. Procedure for Calculating Economic
Thickness of Insulation
Note: the total cost is lower when using 2" insulation, hence is the economic insulation
thickness.
14. INTRODUCTION
• How the structure of blast furnace survive with so much temperature?
• The whole theory relies on heat insulating property of some materials known
as Refractory Materials
• REFRACTORY MATERIALS
• Any material can be described as ‘refractory’, if it can with stand the action
of abrasive or corrosive solids, liquids or gases at high temperatures.
or
• A material having the ability to retain its physical shape and chemical
identity when subjected to high temperatures.
or
• ASTM C71 defines refractories as "non-metallic materials having those
chemical and physical properties that make them applicable for structures
or as components of systems that are exposed to environments above 1,000
°F (811 K; 538 °C)".
• Refractories are inorganic, non-metallic, porous and heterogeneous
materials composed of thermally stable mineral aggregates, a binder
phase and additives
Blast Furnace
15. REFRACTORIES
• A refractory material is one that retains its strength at high
temperatures. ASTM C71 defines refractories as "non-
metallic materials having those chemical and physical
properties that make them applicable for structures, or as
components of systems, that are exposed to environments
above 1,000 °F (811 K; 538 °C)".
• Refractory materials are used in linings for furnaces, kilns,
incinerators and reactors. They are also used to make
crucibles and moulds for casting glass and metals and for
surfacing flame deflector systems for rocket launch structures.
• Today, the iron- and steel-industry uses approximately 70% of
all refractories produced.
16. THE GENERAL REQUIREMENTS OF A
REFRACTORY MATERIAL
• Ability to withstand high temperatures.
• Ability to withstand sudden changes of temperatures.
• Ability to withstand action of molten metal slag, glass, hot
gases, etc.
• Ability to withstand load at service conditions.
• Ability to withstand load and abrasive forces.
• Low coefficient of thermal expansion.
• Should be able to conserve heat.
• Should not contaminate the material with which it comes into
contact.
17. PROPERTIES OF REFRACTORIES
• MELTING POINT
Most refractory materials consist of high melting particles bonded together. At
high temperature, glass fuses and as the temperature rises, the resulting slag
increases in quantity by partial solution of the refractory particles. The
temperature at which this action results in failure of a test pyramid (cone) to
support its own weight is called, for convenience, the melting point of the
refractory. Table shows the melting point of some pure compounds used as
refractories.
18. • BULK DENSITY:
Its defines the material present in a given volume. An increase in bulk density of a
given refractory increases its volume stability, its heat capacity, as well as resistance
to slag penetration.
• POROSITY:
The apparent porosity is a measure of the volume of the open pores, into which a
liquid can penetrate, as a percentage of the total volume. This is an important
property in cases where the refractory is in contact with molten charge and slags. A low
apparent porosity is desirable since it would prevent easy penetration of the refractory
size and continuity of pores will have important influences on refractory behaviour. A
large number of small pores is generally preferable to an equivalent number of large
pores.
• COLD CRUSHING STRENGTH:
the ability to withstand the rigors of transport, can be used as a useful indicator to
the adequacy of firing and abrasion resistance in consonance with other properties such
as bulk density and porosity.
PROPERTIES OF REFRACTORIES CONT.
19. • Pyrometric Cone Equivalent (PCE):
Temperature at which a refractory will deform under its own weight is known as its
softening temperature which is indicated by PCE. Refractories, due to their chemical
complexity, melt progressively over a range of temperature. Hence refractoriness or fusion
point is ideally assessed by the cone fusion method. The equivalent standard cone which
melts to the same extent as the test cone is known as the pyrometric cone equivalent.
According to ASTM C24 -01, PCE is measured by making a cone of the material and firing
it until it bends to 3 O’clock.
Thus in the Figure refractoriness of Sample A is much higher than B and C. The pyrometric
cone equivalent indicates only the softening temperature. But, in service the refractory is
subjected to loads which would deform the refractory at a much lower temperature than that
indicated by PCE. With change in the environmental conditions, such as reducing
atmosphere, the P.C.E. value changes drastically.
PROPERTIES OF REFRACTORIES CONT.
20. • Refractoriness under load (RUL):
The refractoriness under load test (RUL test) gives an indication of the temperature at
which the bricks will collapse, in service conditions with similar load.
• Creep at high temperature:
Creep is a time dependent property which determines the deformation in a given time and
at a given temperature by a material under stress.
• Volume stability : Expansion and Shrinkage at high temperatures:
The contraction or expansion of the refractories can take place during service. Such
permanent changes in dimensions may be due to:
i) The changes in the allotropic forms which cause a change in specific gravity.
ii) A chemical reaction which produces a new material of altered specific
gravity.
iii) The formation of liquid phase.
iv) Sintering reactions.
v) It may also happen on account of fluxing with dust and stag or by the action
of alkalies on fireclay refractories, to form alkali-alumina silicates,
causing expansion and disruption. This is an example which is generally
observed in blast furnaces.
PROPERTIES OF REFRACTORIES CONT.
21. • Reversible Thermal Expansion:
Any material when heated, expands, and contracts on cooling. The reversible
thermal expansion is a reflection on the phase transformations that occur during
heating and cooling.
• Thermal Conductivity:
Thermal conductivity depends upon the chemical and mineralogical
compositions as well as the glassy phase contained in the refractory and the
application temperature. The conductivity usually changes with rise in
temperature. In cases where heat transfer is required though the brick work, for
example in recuperates, regenerators, muffles, etc. the refractory should have
high conductivity. Low thermal conductivity is desirable for conservation of heat
by providing adequate insulation.
PROPERTIES OF REFRACTORIES CONT.
22. REFRACTORY MATERIALS
• Refractory materials must be chemically and physically stable at high
temperatures. Depending on the operating environment, they need to be resistant
to thermal shock, be chemically inert, and/or have specific ranges of thermal
conductivity and of the coefficient of thermal expansion.
• The oxides of aluminium (alumina), silicon (silica) and magnesium (magnesia)
are the most important materials used in the manufacturing of refractories. Another
oxide usually found in refractories is the oxide of calcium (lime). Fire clays are
also widely used in the manufacture of refractories.
• Refractories must be chosen according to the conditions they will face. Some
applications require special refractory materials. Zirconia is used when the
material must withstand extremely high temperatures. Silicon
carbide and carbon (graphite) are two other refractory materials used in some
very severe temperature conditions, but they cannot be used in contact
with oxygen, as they will oxidize and burn.
• Binary compounds such as tungsten carbide or boron nitride can be very
refractory. Hafnium carbide is the most refractory binary compound known, with
a melting point of 3890 °C.
• The ternary compound tantalum hafnium carbide has one of the highest melting
points of all known compounds (4215 °C).
23. CLASSIFICATION OF REFRACTORY MATERIALS
• Based on chemical composition
– Acidic refractories
– Neutral refractories
– Basic refractories
• Based on method of manufacture
– Dry press process
– Fused cast
– Hand molded
– Formed (normal, fired or
chemically bonded)
– Un-formed (monolithic-plastic,
ramming and gunning mass,
castables, mortars, dry vibrating
cements.)
– Un-formed dry refractories
• Based on fusion temperature
– Normal refractory: fusion
temperature of 1580 ~ 1780 °C
(e.g. Fire clay)
– High refractory: fusion
temperature of 1780 ~ 2000 °C
(e.g. Chromite)
– Super refractory: fusion
temperature of > 2000 °C (e.g.
Zirconia)
25. CLASSIFICATION OF REFRACTORY
MATERIALS CONT.
• Based on chemical composition
• Acidic refractories
Acidic refractories consist of mostly acidic materials like alumina (Al2O3)
and silica (SiO2). They are generally not attacked or affected by acidic materials, but
easily affected by basic materials. They include substances such as silica, alumina, and
fire clay brick refractories. Notable reagents that can attack both alumina and silica are
hydrofluoric acid, phosphoric acid, and fluorinated gases (e.g. HF, F2). At high
temperatures, acidic refractories may also react with limes and basic oxides.
• Neutral refractories
These are used in areas where slags and atmosphere are either acidic or basic and are
chemically stable to both acids and bases. The main raw materials belong to, but are not
confined to, the R2O3 group. Common examples of these materials
are alumina (Al2O3), chromia (Cr2O3) and carbon.
• Basic refractories
These are used in areas where slags and atmosphere are basic; they are stable to
alkaline materials but could react with acids. The main raw materials belong to the RO
group to which magnesia (MgO) is a very common example. Other examples include
dolomite and chrome-magnesia. For the first half of the twentieth century, the steel
making process used artificial periclase (roasted magnesite) as a lining material for the
furnace.
26. SELECTION OF REFRACTORIES
• The selection of refractories for any particular application is made with a view to achieve
the best performance of the equipment furnace, kiln or boiler and depends on their
properties. Further, the choice of a refractory material for a given application will be
determined by the type of furnace or heating unit and the prevailing conditions e.g. the
gaseous atmosphere, the presence of slags, the type of metal charge etc. It is, therefore,
clear that temperature is by no means the only criterion for selection of refractories.
• The furnace manufacturers or users have to consider the following points, before
selecting a refractory.
i) Area of application.
ii) Working temperatures.
iii) Extent of abrasion and impact.
iv) Structural load of the furnace.
v) Stress due to temperature gradient in the structures and temperature fluctuations.
vi) Chemical compatibility to the furnace environment.
vii) Heat transfer and fuel conservation
viii) Cost considerations.
27. HEAT LOSS AND ENERGY
CONSERVATION
• Furnaces and kilns particularly depending on heat treatment or melting applications
operate at very high temperatures. Refractory bricks are used for internal lining of
furnace. When a furnace is heated up from cold, the first stage involves bringing the
brickwork up to temperature. The heat energy required for initial heat up depends to a
great extent upon the time cycle of the furnace. In a furnace with a weekly cycle when
the furnace is not used at weekends it will be considerable. With a daily cycle shutting
down over night it will still be considerable. Finally in furnaces operating on a heating
and cooling cycle in which the furnace is heated up with each charge of goods, the heat
consumed by the brickwork may assume quite surprising proportions in relation to the
heat usefully used.
• The heat stored in the body of the furnace depends on the weight of each component, its
specific heat and its average rise in temperature. There are two broad categories of
furnaces viz. continuous furnaces and intermittent batch type furnaces.
Whichever category of furnace is used, the heat losses result from
1) The loss through the furnace walls due to conduction, radiation and convection.
2) The loss due to the thermal mass of the furnace storing unnecessary heat
28. HEAT LOSS AND ENERGY
CONSERVATION CONT.
• The striking benefits of the application of insulation to a furnace can be seen from the
following example:
• A refractory brick walled furnace with walls of a nominal 9” thickness and an internal
wall temperature of 2000°F will lose 145 BTUs per square feet. With a nominal 4” of
insulation the heat loss will be reduced to 32 BTUs per square feet and with nominal 8”
insulation to 18 BTUs per square feet.
• Heat losses can also be reduced to certain extent by increasing the thickness of the
refractory brick but this is not very effective as this method adds significant cost to the
furnace structure. It is much better to use insulation. But a word of caution: The insulation
of furnaces should not be adopted without careful consideration of the
• consequences and the changes in refractory temperatures that may result.
• Heat losses can also be reduced to certain extent by increasing the thickness of the
refractory brick but this is not very effective as this method adds significant cost to the
furnace structure. It is much better to use insulation. But a word of caution:
• The insulation of furnaces should not be adopted without careful consideration of the
• consequences and the changes in refractory temperatures that may result.
29. HEAT LOSS AND ENERGY
CONSERVATION CONT.
• To sum up, the heat losses from walls depend on
• 1) Inside temperature
• 2) Outside air temperature
• 3) Outside air velocity
• 4) Configuration of walls
• 5) Emissivity of walls
• 6) Thickness of walls
• 7) Conductivity of walls
• The last two can be easily controlled by the furnace fabricator. The following conclusions can be drawn:
a) As the wall thickness increases, the heat losses reduce
b) As thickness of insulation is increased, heat losses reduce
c) The effect of insulation in reducing heat losses is more pronounced than the increase of wall thickness
(roughly 1 cm of insulation brick is equivalent to 5 to 8 cm of refractory firebrick)
d) In intermittent furnaces, thin walls of insulating refractories are preferable to thick walls of a normal
refractory for intermittent operation since less heat is stored in them.
e) One approach to achieve less heat storage capacity would be to utilize insulating material itself to form the
inner refractory lining. Robust refractories with fairly god strength and spelling resistance can be used for
temperature in the range of 1300° C. They are termed as hot face insulation.
f) Hot face insulating bricks are lighter than normal refractories, weighing only one third to one half as much.
Therefore, heat storage in the hot face insulation is very much reduced.