Wetback-Dryback [SearchToll].ppt
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This document compares wetback and dryback designs for Scotch Marine boilers. It summarizes that wetbacks have separate rear tube sheets that allow for expansion and contraction, preventing thermal stresses, while drybacks have a common rear tube sheet. Wetbacks also have a water-backed rear turnaround for improved heat absorption and sustained efficiency compared to the refractory wall of drybacks, which deteriorates over time. Wetbacks require less maintenance due to lacking refractory materials and proprietary sealing kits, and have a smaller functional footprint and lower total operating costs over the 25 year lifespan compared to drybacks.
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Wpływ regulatora temperatury na efektywność systemu grzewczego
Wpływ regulatora temperatury na efektywność systemu grzewczego
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Historic Windows
This document summarizes a presentation on retrofitting historic windows for energy savings rather than replacement. It discusses how window retrofits can achieve similar energy savings as new windows through options like weatherstripping, storm windows, insulating shades and films. A study found most retrofit options had better return on investment than full window replacement. The document outlines the components and repair processes for common wood and steel window types to maximize performance through maintenance and minor repairs. It emphasizes fixing other building envelope issues first before addressing windows to achieve the best energy savings.
Sustainability engineering beyond limits.
Bronswerk Heat Transfer is an engineering company focused on sustainable solutions. They develop energy efficient heat exchangers, cooling systems, condensers, and fans. Their innovations include a compact header design for shell and tube heat exchangers that uses less material, and a new Whizz-Wheel fan that is lighter, quieter, and more efficient than existing fans. Bronswerk offers customized solutions and services to address clients' heat transfer needs.
Saving Energy in Existing Multifamily Buildings
This document summarizes strategies for improving energy efficiency in existing multifamily buildings. It discusses the Center for Energy and Environment (CEE), which conducts research on energy use in multifamily buildings. Key opportunities for energy savings include optimizing existing condensing boilers through proper controls and piping configuration, modifying building ventilation systems to reduce excessive airflow, and installing demand-based hot water recirculation controls. Ensuring success requires focusing on strategies with good paybacks and marketability to building owners.
Step 4 - Properly Sized, Designed, Installed, and Commissioned HVAC Systems
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Building enclosure design presentation 1
This document provides an overview of an enclosure design training presentation focused on low energy buildings. The presentation covers definitions of key terms, the five critical barriers in enclosure design including the thermal and air barriers, approaches to designing continuous barriers, and details of enclosure assemblies. It emphasizes the importance of continuity, airtightness, insulation, and coordination between building systems in achieving energy efficiency and durability. Case studies are presented on high performance building enclosures and MEP designs.
Improved closed loop cooling arrangement
The document discusses closed-loop cooling systems and recommends a cooling tower plus plate heat exchanger system. This system provides a closed cooling circuit while using less energy than traditional closed-circuit cooling towers. It costs less to purchase and operate due to using less total HP. The heat exchanger plates are stainless steel and more accessible than the coil in traditional towers, making maintenance and cleaning easier. The system prevents downtime from corrosion and has a longer warranty.
Airtight Construction - Step 1 of The Seven Steps of Building a Synergy Home
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This document discusses the importance of airtight construction according to the 2009 International Residential Code. It provides many examples of how to properly construct and air seal a home to eliminate air leakage, including sealing electrical boxes, windows, top plates, band joists, attic hatches, recessed lights, and more. Without a comprehensive air sealing approach that addresses all potential leakage points, insulation will not perform as intended and air quality, moisture, and comfort issues may arise.Hydro crackers do you like cracks?
Hydrocracking is a process that uses hydrogen at high pressure and temperature to break down long carbon chains in petroleum into lighter fuels like gasoline and diesel. It involves using a catalyst to crack the hydrocarbon molecules and adding hydrogen, which increases the hydrogen level in the fuels. Producing lighter fuels through hydrocracking requires withstanding high pressures and temperatures, so equipment is made from specialized 21⁄4 chromium steel that is strong but sensitive to rupturing during manufacturing. The document discusses a client project where a heat exchanger was designed and manufactured from 21⁄4 chromium steel to meet the client's specifications for a hydrocracking installation.
Step 3 - Improved Thermal Systems of the Seven Steps of Building a Synergy Home
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This document discusses improvements to building codes and energy efficiency standards, with a focus on proper insulation and air sealing techniques. It notes that the 2009 International Residential Code now addresses energy efficiency, not just health and safety. It emphasizes the importance of airtight construction, proper insulation installation and alignment with the air barrier, quality spray foam insulation, and low-E windows to improve a home's energy efficiency and comfort.Ultra compact air cooled coolers : A cool story?
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This document provides details about renovating a 1970s ranch home in Holderness, NH to make it carbon neutral. Key points:
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New Wave Energy Services Ltd. Presentation 2016 US
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Evacuated tube collectors specifications
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Airtight Construction - Step 1 of The Seven Steps of Building a Synergy Home
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Bradford white water heater information
Bradford White is a water heater manufacturer founded in 1881 that has focused on innovation. It produces American-made water heaters and related products. Bradford White is committed to supporting American workers and manufacturers. It offers a wide range of water heaters for residential and commercial use, including innovative features that improve performance and ease of installation.
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The document summarizes a case study comparing an existing fixed-speed beverage cooler system using R134a to a proposed variable-speed system using R290 from Tecumseh Products Company. Tests were conducted in Tecumseh's laboratories replacing just the cooling cassette. Results showed the variable-speed cassette significantly improved pull-down times by up to 26% and reduced energy consumption by up to 64% while maintaining stable temperatures. The compact design of the variable-speed cassette also increased merchandising space in the cooler. The study concluded the Tecumseh variable-speed solution provides benefits like energy savings, rapid cooling, and a simple transition to R290 refrigerant.Condensing Boilers
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Fluid applied membranes such as the Astec Re-Ply Roofing and Ceramic Coating Systems can have dramatic effects on both maintenance and capital expenditure budgets. This presentation shows how you can promote sustainable facility life-cycle management with products such as Astec.
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Step 4 - Properly Sized, Designed, Installed, and Commissioned HVAC Systems
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Net Zero Energy in Very Cold Climates by Peter Amerongen
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Airtight Construction - Step 1 of The Seven Steps of Building a Synergy Home
Airtight Construction - Step 1 of The Seven Steps of Building a Synergy Home
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Step 3 - Improved Thermal Systems of the Seven Steps of Building a Synergy Home
New Wave Energy Services Ltd. Presentation 2016 US
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Airtight Construction - Step 1 of The Seven Steps of Building a Synergy Home
Is Passivhaus a step too far? South Pacific Passive House Conference Auckland...
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Applications of artificial Intelligence in Mechanical Engineering.pdf
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
Null Bangalore | Pentesters Approach to AWS IAM
#Abstract:
- Learn more about the real-world methods for auditing AWS IAM (Identity and Access Management) as a pentester. So let us proceed with a brief discussion of IAM as well as some typical misconfigurations and their potential exploits in order to reinforce the understanding of IAM security best practices.
- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
- Basics of IAM in AWS
- Implementing IAM Policies with Least Privilege to Manage S3 Bucket
- Objective: Create an S3 bucket with least privilege IAM policy and validate access.
- Steps:
- Create S3 bucket.
- Attach least privilege policy to IAM user.
- Validate access.
- Exploiting IAM PassRole Misconfiguration
-Allows a user to pass a specific IAM role to an AWS service (ec2), typically used for service access delegation. Then exploit PassRole Misconfiguration granting unauthorized access to sensitive resources.
- Objective: Demonstrate how a PassRole misconfiguration can grant unauthorized access.
- Steps:
- Allow user to pass IAM role to EC2.
- Exploit misconfiguration for unauthorized access.
- Access sensitive resources.
- Exploiting IAM AssumeRole Misconfiguration with Overly Permissive Role
- An overly permissive IAM role configuration can lead to privilege escalation by creating a role with administrative privileges and allow a user to assume this role.
- Objective: Show how overly permissive IAM roles can lead to privilege escalation.
- Steps:
- Create role with administrative privileges.
- Allow user to assume the role.
- Perform administrative actions.
- Differentiation between PassRole vs AssumeRole
Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
Impartiality as per ISO /IEC 17025:2017 Standard
This document provides basic guidelines for imparitallity requirement of ISO 17025. It defines in detial how it is met and wiudhwdih jdhsjdhwudjwkdbjwkdddddddddddkkkkkkkkkkkkkkkkkkkkkkkwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwioiiiiiiiiiiiii uwwwwwwwwwwwwwwwwhe wiqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq gbbbbbbbbbbbbb owdjjjjjjjjjjjjjjjjjjjj widhi owqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq uwdhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhwqiiiiiiiiiiiiiiiiiiiiiiiiiiiiw0pooooojjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj whhhhhhhhhhh wheeeeeeee wihieiiiiii wihe
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Accident detection system project report.pdf
The Rapid growth of technology and infrastructure has made our lives easier. The
advent of technology has also increased the traffic hazards and the road accidents take place
frequently which causes huge loss of life and property because of the poor emergency facilities.
Many lives could have been saved if emergency service could get accident information and
reach in time. Our project will provide an optimum solution to this draw back. A piezo electric
sensor can be used as a crash or rollover detector of the vehicle during and after a crash. With
signals from a piezo electric sensor, a severe accident can be recognized. According to this
project when a vehicle meets with an accident immediately piezo electric sensor will detect the
signal or if a car rolls over. Then with the help of GSM module and GPS module, the location
will be sent to the emergency contact. Then after conforming the location necessary action will
be taken. If the person meets with a small accident or if there is no serious threat to anyone’s
life, then the alert message can be terminated by the driver by a switch provided in order to
avoid wasting the valuable time of the medical rescue team.
Blood finder application project report (1).pdf
Blood Finder is an emergency time app where a user can search for the blood banks as
well as the registered blood donors around Mumbai. This application also provide an
opportunity for the user of this application to become a registered donor for this user have
to enroll for the donor request from the application itself. If the admin wish to make user
a registered donor, with some of the formalities with the organization it can be done.
Specialization of this application is that the user will not have to register on sign-in for
searching the blood banks and blood donors it can be just done by installing the
application to the mobile.
The purpose of making this application is to save the user’s time for searching blood of
needed blood group during the time of the emergency.
This is an android application developed in Java and XML with the connectivity of
SQLite database. This application will provide most of basic functionality required for an
emergency time application. All the details of Blood banks and Blood donors are stored
in the database i.e. SQLite.
This application allowed the user to get all the information regarding blood banks and
blood donors such as Name, Number, Address, Blood Group, rather than searching it on
the different websites and wasting the precious time. This application is effective and
user friendly.
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Generative AI Use cases applications solutions and implementation.pdf
Generative AI solutions encompass a range of capabilities from content creation to complex problem-solving across industries. Implementing generative AI involves identifying specific business needs, developing tailored AI models using techniques like GANs and VAEs, and integrating these models into existing workflows. Data quality and continuous model refinement are crucial for effective implementation. Businesses must also consider ethical implications and ensure transparency in AI decision-making. Generative AI's implementation aims to enhance efficiency, creativity, and innovation by leveraging autonomous generation and sophisticated learning algorithms to meet diverse business challenges.
https://www.leewayhertz.com/generative-ai-use-cases-and-applications/
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Mechanical Engineering PROJECT REPORT ON SUMMER VOCATIONAL TRAINING
AT MBB AIRPORT
Levelised Cost of Hydrogen (LCOH) Calculator Manual
The aim of this manual is to explain the
methodology behind the Levelized Cost of
Hydrogen (LCOH) calculator. Moreover, this
manual also demonstrates how the calculator
can be used for estimating the expenses associated with hydrogen production in Europe
using low-temperature electrolysis considering different sources of electricity
一比一原版(爱大毕业证书)爱荷华大学毕业证如何办理
原版一模一样【微信：741003700 】【(爱大毕业证书)爱荷华大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】外观非常简单，由纸质材料制成，上面印有校徽、校名、毕业生姓名、专业等信息。
办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
校徽：象征着学校的荣誉和传承。
校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理(爱大毕业证书)爱荷华大学毕业证【微信：741003700 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
原版制作(Humboldt毕业证书)柏林大学毕业证学位证一模一样
原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问微bwp0011
【主营项目】
一.毕业证【微bwp0011】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微bwp0011】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODEL
As digital technology becomes more deeply embedded in power systems, protecting the communication
networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3)
represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data
Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities.
Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because
of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To
solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion
detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network
(CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection
dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to
train and test our model. The results of our experiments show that our CNN-LSTM method is much better
at finding smart grid intrusions than other deep learning algorithms used for classification. In addition,
our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
accuracy rate of 99.50%.
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Wetback-Dryback [SearchToll].ppt
- 1. 1 Wetback vs Dryback Scotch Marine Boiler Design
- 2. 2 Wetback vs Dryback Goal The purpose of this presentation is to provide project decision-makers with fundamental, and critical, boiler design information.
- 3. 3 Wetback vs Dryback Two Basic Designs Dominate the Scotch Marine Boiler Market: Wetback Dryback
- 4. 4 Wetback vs Dryback Wetback vs. Dryback • Basic construction comparison • Design principles • Technical considerations • Total operating costs comparison This presentation will show you the differences
- 5. 5 Wetback vs Dryback Three-Pass Wetback
- 6. 6 Wetback vs Dryback Wetback Design Principles • Separate tube sheets between all major temperature changes (between tube passes) • Rear turnaround is totally surrounded by water • No expensive refractory to maintain • Rear doors are either lightweight lift off type or split-hinged • Sealing materials are inexpensive, non-proprietary • Efficient “functional footprint”
- 7. 7 Wetback vs Dryback Four-Pass Dryback
- 8. 8 Wetback vs Dryback Dryback Design Principles • Common rear tube sheet between passes • Rear turnaround is a refractory wall • Door refractory is a maintenance item • Rear door is vessel-sized in diameter, extremely heavy, and hinged or davited • Sealing materials are typically proprietary • Large “functional footprint”
- 9. 9 Wetback vs Dryback Tube Sheets Wetback Separate rear tube sheets • Separate tube sheets are free to expand and contract at their own rate in response to the 1300 – 1600 F temp. differential between passes. Dryback Common rear tube sheet • Common tube sheet experiences extreme thermal stress in response to temp. differentials, increasing the likelihood of leaks.
- 10. 10 Wetback vs Dryback Rear Tube Sheets Wetback is Separate Dryback is Common
- 11. 11 Wetback vs Dryback Rear Turnaround Wetback • Surrounding water absorbs burner heat, improving efficiency by 1 to 3%. • Efficiency is sustainable, as turnaround does not deteriorate over time. Dryback • Rear refractory wall reflects burner heat, promoting greater exterior radiation losses. • Hot flue gases erode refractory baffle resulting in “short circuiting,” and loss of efficiency.
- 12. 14 Wetback vs Dryback Rear Refractory Replacement Wetback • NO expensive refractory to maintain • Significant maintenance cost savings over the life of ownership Dryback • Refractory must be inspected regularly and replaced periodically • Replacement costs are burdensome, involving proprietary sealing kits, special rigging and down time
- 13. 15 Wetback vs Dryback Doors Wetback • Front Doors are typically split-hinged, or davited • Rear Doors are lightweight (< 60#) lift-type
- 14. 16 Wetback vs Dryback Doors Wetback • Larger models typically feature hinged, or davited rear doors • Split doors maintain efficient “functional footprint”
- 15. 17 Wetback vs Dryback Doors Dryback Annual inspections are typically more costly for the dryback, requiring proprietary door sealing kits, special tools, and considerable manpower in “muscling” massive, and typically sagging, doors into “bolt-thru” alignment.
- 16. 18 Wetback vs Dryback Doors Dryback • Large, heavy, single front door offers complicated multi- sectioned design • Additional costs for seal kits and labor can significantly impact annual operating expenses
- 17. 19 Wetback vs Dryback Simplified design requires far fewer seals All are non-proprietary, inexpensive, and easy to install Sealing Kits Wetback
- 18. 20 Wetback vs Dryback Sealing Kits Dryback “Watch Case” design requires numerous proprietary sealing kits for each inspection, and every vessel service
- 19. 21 Wetback vs Dryback Functional Footprint Dryback Wetback • Dryback: Vessel-diameter door means a larger functional footprint, demanding additional floorspace •Wetback: Lift-type or split-hinged doors have minimal impact on floorspace requirements
- 20. 23 Wetback vs Dryback The Wetback Advantage: Summary • Offer far fewer maintenance concerns: - No rear door refractory to repair - No refractory baffling to burn-out - Far less thermal stress on tube sheets, and tube ends • Don’t require proprietary parts • Offer maximum sustainable efficiency: Maintenance- free water backed turnaround provides better heat absorption at the most critical heat transfer point. Wetback Boilers -
- 21. 24 Wetback vs Dryback Maintenance Costs Comparison Bottom Line We surveyed a few of our service reps who perform repair/maintenance work on boilers and specifically asked them to share dryback expenses. We averaged them together and came up with the following maintenance report;
- 22. 25 Wetback vs Dryback Based on repairs costs of a 300 HP boiler with a life span of 25 years • Average cost to replace refractory rear door; $6,000 each time • Average cost to replace proprietary door gaskets; $500 each time
- 23. 26 Wetback vs Dryback The rear door needs to be replaced every 3 years, or 8 times. The gaskets need replaced 2-3 times per year. • Refractory door; $6,000 x 8 times = $48,000 • Door gaskets; $500 x 2 times/year x 25 = $25,000 • Wetback gaskets; $30 x 1/year x 25 years = $750 Total maintenance costs for 25 years $72,250 They could have bought a new boiler and burner!!
- 24. 27 Wetback vs Dryback Add In Consideration to Sustainable Efficiency Improvement. Don’t You Think Someone Should Know That Before Making an Equipment Decision? Any Questions?