1. The document discusses heat exchangers and describes an experiment using a shell and tube heat exchanger. The objectives are to evaluate heat transfer coefficients, LMTD, heat transfer, and heat loss. Water is used as the hot and cold fluids flowing in counter-current configuration.
2. Key aspects covered include types of heat exchangers, theory behind heat transfer calculations, experimental procedures, results which did not match theory due to bubbles, and conclusions that objectives were still met despite non-ideal results.
3. The shell and tube heat exchanger uses water, with hot water inside tubes and cold water in the shell space. Heat is transferred between the streams in counter-current flow. Calculations
Storing latent heat with liquid crystals (13th european conference on liquid ...Jokin Hidalgo
Thermal energy storage a key element in thermal
processes management especially in those related
to renewable energies. When processes entail
water condensation/evaporation, the best approach
is storing energy as latent heat with phase change
materials (PCM’s) that undergo state transitions at
temperatures close to the steam working conditions
(i.e. 140ºC-340 ºC). Current PCM’s exhibit solid to
liquid transitions and have a very poor thermal
conductivity Power density of the whole storage
is reduced and power in discharge is not constant.
Storing latent heat with liquid crystals (13th european conference on liquid ...Jokin Hidalgo
Thermal energy storage a key element in thermal
processes management especially in those related
to renewable energies. When processes entail
water condensation/evaporation, the best approach
is storing energy as latent heat with phase change
materials (PCM’s) that undergo state transitions at
temperatures close to the steam working conditions
(i.e. 140ºC-340 ºC). Current PCM’s exhibit solid to
liquid transitions and have a very poor thermal
conductivity Power density of the whole storage
is reduced and power in discharge is not constant.
The objective of this experiment is to calculate the rate of the heat transfer log mean temperature difference, and the overall heat transfer coefficient in case of Counter flow
Parallel flow heat exchanger is analysed with CFD tool. A comparative study of the analytical and experimental data is carried out to better understand the temperature profile, surface heat flux and heat transfer co-efficient parameters of the heat exchanger
Heat exchangers are devices that transfer heat from one medium to another. The purpose of the heat transfer typically is to lower or raise temperatures in a device.
Heat transfer is branch of thermodynamics in which due to temperature difference exist between two bodies heat flows from higher source temperature to lower source temperature.
The main principle used is that of the apparent thermal expansion of the liquid used. It is the difference between the volumetric reversible thermal expansion of the liquid and its glass container that makes it possible to measure temperature.
The objective of this experiment is to calculate the rate of the heat transfer log mean temperature difference, and the overall heat transfer coefficient in case of Counter flow
Parallel flow heat exchanger is analysed with CFD tool. A comparative study of the analytical and experimental data is carried out to better understand the temperature profile, surface heat flux and heat transfer co-efficient parameters of the heat exchanger
Heat exchangers are devices that transfer heat from one medium to another. The purpose of the heat transfer typically is to lower or raise temperatures in a device.
Heat transfer is branch of thermodynamics in which due to temperature difference exist between two bodies heat flows from higher source temperature to lower source temperature.
The main principle used is that of the apparent thermal expansion of the liquid used. It is the difference between the volumetric reversible thermal expansion of the liquid and its glass container that makes it possible to measure temperature.
heat exchanger is a device that transfers heat between two or more fluids. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Heat exchangers are widely used in a variety of applications, including:
Heating and cooling systems
Power plants
Chemical processing
Food processing
Refrigeration
Air conditioning
Aim of the experiment
“The aim of this experiment is to determine the amount of heat loss from hot water by
parallel flow current in the pipes of the heat exchanger.”
Double Pipe Heat Exchanger. 3
Chemical Engineering Department.
Stage III
Introduction to double pipe heat exchangers
A double pipe heat exchanger, also known as a hairpin heat exchanger, is a type of heat
exchanger used to transfer heat between two fluids. It consists of two concentric pipes,
one inside the other, forming a “U” or “hairpin” shape. One fluid flows through the inner
pipe, while the other flows through the annular space between the inner and outer pipes.
This design allows for efficient heat transfer between the two fluids, making it suitable for
various applications, such as cooling or heating processes in industrial systems.
Types of flows in double pipe heat exchangers
In a double pipe heat exchanger, there are two primary flow arrangements, each with its
variations, however, we are going to be focusing on two simple arrangements only, as
they would suffice to comprehend the basic ideas behind double pipe heat exchangers.
One flow arrangement is called “parallel flow” and the other is called “counter flow”.
The latter will be explained in our next experiment.
Parallel flow or uni-flow: in this type of flow, both the hot and cold fluids flow in the
same direction, entering one end of the inner pipe and exiting the other end. This
arrangement is simple but generally less efficient for heat transfer because the
temperature difference between the two fluids decreases along the length of the
exchanger.
Figure 1: simple parallel flow diagram.
By “Research Gate”
Double Pipe Heat Exchanger. 4
Chemical Engineering Department.
Stage III
However, when there’s a significant temperature difference between the two fluids at the
inlet, parallel flow heat exchangers can be more efficient for heat transfer. Both
arrangements have advantages and disadvantages and are used depending on the
system requirements.
Theoretical calculation for heat transfer in double pipe heat
exchangers
Heat Transfer: Heat transfer is the process of the exchange of thermal energy between
two objects or systems that are at different temperatures, and the heat energy always
flows from the high temperature object or system to the low ones because the entropy of
an isolated system can never decrease.
There are several ways to calculate the amount of heat added or lost by an object or a
system. However, in this experiment a relatively simple equation can be used to
determine the amount of heat lost from the hot water, which is equal to the amount of
heat added to the cold water.
When pressure is held constant throughout the process, the amount of heat transfer will
be equal to the change in enthalpy of the system and therefore can be calculated using
constant pressure enthalpy change equation.
Q=ΔH=mCpΔT
Where:
Q=ΔH is the amount of heat transferred to or from the system (J).
m: mass of the system (Kg)
Cp: cons
Type of heat exchanger. Which is mainly used in food industries, like dairy plant, for the pasturization, heat treatment of the beavrages or liquid raw material.
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.
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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.
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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.
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.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
1. 1 | P a g e
االسم
:
حا عدي
حمزة مرزة تم
A الشعبة
:
-
المرحلة
ال
ثالثة
2. 2 | P a g e
• Recognize numerous types of heat exchangers, and classify them,
• Develop an awareness of fouling on surfaces, and determine the overall heat
transfer coefficient for a heat exchanger,
• Perform a general energy analysis on heat exchangers,
• Obtain a relation for the logarithmic mean temperature difference for use in the
LMTD method, and modify it for different types of heat exchangers using the
correction factor,
• Develop relations for effectiveness, and analyze heat exchangers when outlet
temperatures are not known using the effectiveness-NTU method,
• Know the primary considerations in the selection of heat exchangers.
Heat exchangers are devices that facilitate the exchange of heat between two fluids
that are at different temperatures while keeping them from mixing with each other.
Heat exchangers are commonly used in practice in a wide range of applications,
from heating and air-conditioning systems in a household, to chemical processing
and power production in large plants. Heat exchangers differ from mixing
chambers in that they do not allow the two fluids involved to mix. In a car radiator,
for example, heat is transferredfrom the hot water flowing through the radiator
tubes to the air flowing through the closely spaced thin plates outside attached to
the tubes. Heat transfer in a heat exchanger usually involves convection in each
fluid and conduction through the wall separating the two fluids. In the analysis of
heat exchangers, it is convenient to work with an overall heat transfer coefficient
U that accounts for the contribution of all these effects on heat transfer. The rate of
heat transfer between the two fluids at a location in a heat exchanger depends on
the magnitude of the temperature difference at that location, which varies along
the heat exchanger. In the analysis of heat exchangers, it is usually convenient to
work with the logarithmic mean temperature difference LMTD, which is an
equivalent mean temperature difference between the two fluids for the entire heat
exchanger. Heat exchangers are manufactured in a variety of types, and thus we
start this chapter with the classification of heat exchangers. We then discuss the
determination of the overall heat transfer coefficient in heat exchangers, and the
1.Objectives
2. Introduction
3. 3 | P a g e
LMTD for some configurations. We then introduce the correction factor F to
account for the deviation of the mean temperature difference from the LMTD
in complex configurations. Next we discuss the effectiveness–NTU method,
which enables us to analyze heat exchangers when the outlet temperatures of
• Different heat transfer applications require different types of hardware and
different configurations of heat transfer equipment.
3.1-Double-Pipe Heat Exchangers:-
• The simplest type of heat exchanger is called the double-pipe heat exchanger.
• One fluid flows through the smaller pipe while the other fluid flows through the
annular space between the two pipes.
• Two types of flow arrangement
– parallel flow, – counter flow.
3. Types of Heat Exchangers
4. 4 | P a g e
3.2-Compact Heat Exchanger:-
• Large heat transfer surface area per unit volume.
• Area density β ─ heat transfer surface area of a heat
exchanger to its volume ratio.
• Compact heat exchanger β >700 m2/m3.
• Examples:
– car radiators (β ≈1000 m2/m3),
– glass-ceramic gas turbine heat
exchangers (β ≈6000 m2/m3),
– the regenerator of a Stirling
engine (β ≈15,000 m2/m3), and
– the human lung (β ≈20,000 m2/m3).
• Compact heat exchangers are commonly used
in
– gas-to-gas and
– gas-to liquid (or liquid-to-gas) heat exchangers.
• Typically cross-flow configuration ─ the two
fluids move perpendicular to each other.
• The cross-flow is further classified as
5. 5 | P a g e
3.3- Shell-and-Tube Heat Exchanger
• The most common type of heat exchanger in industrial applications.
• Large number of tubes are packed in a shell with their axes parallel to that of the
shell.
• The other fluid flows outside the tubes through the shell.
• Baffles are commonly placed in the shell.
• Shell-and-tube heat exchangers are relatively large size and weight.
• Shell-and-tube heat exchangers are further classified according to the number of
shell and tube passes involved.
3.4 Plate and Frame Heat Exchanger
• Consists of a series of plates with corrugated flat flow passages.
• The hot and cold fluids flow in alternate passages
• Well suited for liquid-to-liquid heat exchange applications, provided that the hot
and cold fluid streams are at about the same pressure.
6. 6 | P a g e
The main function of heat exchanger is to either remove heat from a hot fluid or to
add heat to the cold fluid. The direction of fluid motion inside the heat exchanger
can normally categorized as parallel flow, counter flow and cross flow. In this
experiment, heat exchanger used is only counter-current flow. For counter-current
flow, both the hot and cold fluids flow in the opposite direction. Both the fluids
enter and exit the heat exchanger on the opposite ends. This experiment focused on
the shell and tube heat exchanger.
Hot water flow rate (Hw )
QH = mH x CpH x (t1-t2)
Hot water flow rate (Cw )
QC = mC x CpC x (T2-T1)
Where:
QH = Heat load for hot water flow rate
QC= Heat load for cold water flow rate
mH=Hot water mass flow rate
mC=Cold water mass flow rate
t1=Hot water inlet temperature
t2=Hot water outlet temperature
T1=Cold water inlet temperature
T2=Cold water outlet temperature
LMTD
Calculations of log mean temperature difference (LMTD)
4. THEORY
7. 7 | P a g e
)
(
)
(
ln
)
(
)
(
1
2
2
1
1
2
2
1
T
t
T
t
T
t
T
t
LMTD
Heat loss rate = QH - QC
Dirt factor, Q = 0.5 (QH + QC )
Overall heat transfer coefficient, U
Overall heat transfer coefficient at which equivalent to D
U can be calculated by
using equation below. In this case, the value of total heat transfer area A has been
given and equal to 0.05 m2
.
LMTD
A
Q
U
Where:
Q Heat rate with respect to the average head load
Reynolds Number Calculation
Re =
ρv(ds−do)
μ
At which
Tube outside diameter, m
ds = Shell diameter, m
Viscosity, taken at average fluid temperature in the shell, Pa.s
Exchange area, m2
do
As
8. 8 | P a g e
5.1-General Start-up Procedure :
1. A quick inspection was performed to make sure that the equipment is in proper
working condition.
2. All valves were initially closed except V1 and V12.
3. Hot tank was filled via a water supply hose connected to valve V27. Once the
tank is full, the valve was closed.
4. The cold water tank was filled up by opening valve V28 and the valve was left
opened for continuous water supply.
5. A drain hose was connected to the cold water drain point.
6. Main power was switched on. The heater for the hot water tank was switched on
and the temperature controller was set to 50o
C.
7. The water temperature in the hot water tank was allowed to reach the set point.
8. The equipment was now ready to be run.
5.2-Counter-current Shell & Tube Heat Exchanger Procedures :
1. General start-up procedures was performed.
2. The valves to counter-current Shell & Tube Heat Exchanger arrangement was
switched.
3. Pumps P1 and P2 were switched on.
4. Valves V3 and V14 were adjusted and opened to obtain the desired flowrates for
hot water and cold water streams, respectively.
5. The system was allowed to reach steady state for 10 minutes.
6. FT1, FT2, TT1, TT2, TT3 and TT4 were recorded.
7. Pressure drop measurements for shell-side and tube side were recorded for
pressure drop studies.
5.PROCEDURE
9. 9 | P a g e
8. Steps 4 to 7 were repeated for different combinations of flowrate FT1 and FT2.
9. Pumps P1 and P2 were switched off after the completion of experiment.
5.3-General Shutdown Procedure :
1. The heater was switched off. The hot water temperature was waited until it
dropped below 40o
C.
2. Pump P1 and pump P2 were switched off.
3. The main power was switched off.
4. All water in the process line was drained off. The water in the hot and cold water
tanks were retained for next laboratory sessions.
5. All valves were closed.
In this experiment of shell and tube heat exchanger particular apparatus, water is used as
both the hot and cold fluid. The purpose of this heat exchanger is to cool a hot stream. Cooling
water flows through the outer pipe (the shell), and hot water flows through the inner pipe on the
inside. Heat transfer occurs in both directions; the hot water is cooled, and the cooling water is
heated. This arrangement is called a “shell-and-tube” heat exchanger. There are many other
forms of heat exchangers; most notably, the double-pipe heat exchanger.
The main objectives of this experiment is to evaluate and study the overall heat transfer
coefficient, LMTD, heat transfer and heat loss for energy balance as well as to evaluate and
study the performance of shell and tube heat exchanger at various operating condition. In this
shell and tube heat exchanger, the fluids flow in counter-current flow which results in faster heat
exchange. The basic theory in this air experiment is QH=QC, which the amount of heat release by
hot water is equal to the amount of heat absorb by cold water. However, the results is different
than the basic theory where the amount of heat release by hot water is not equal to the amount of
heat absorb by cold water, QH ≠ QC. This is due to some errors during conducting this
experiment which are the presence of bubbles in tube where the hot water flows. The presence of
these bubbles can cause corrosion and disturb the process of heat transfer. Although the results
6. DISCUSSION
7. CONCLUSION
10. 10 | P a g e
are not followed the basic theory, this experiment can be said as successful as the objectives of
this experiment is already achieve.
1-Yunus A.Cengel (2007). Heat and Mass Transfer Fundamentals and Application.
2-Shankar.S (n.d). Shell and Tube Heat Exchanger.
3- Chris.W (2016). Heat Exchanger. Retrieved from http://www.explainthatstuff.com/how-heat-
exchangers-work.html
8. References