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Chapter 4 Heat Exchanger (1).pptx

Chapter 4 Heat Exchanger (1).pptx - BKF2422 HEAT TRANSFER...

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BKF2422 HEAT TRANSFER CHAPTER 4 HEAT EXCHANGER CO2 Utilize the design equations for heat exchanger to solve problems related to heat exchanger. PO1 Engineering Knowledge - Apply knowledge of mathematics, science, engineering fundamentals and an engineering specialisation to the solution of complex engineering problems. PO2 Problem Analysis - Identify, formulate, research literature and analyse complex engineering problems reaching substantiated conclusions using first principles of mathematics, natural sciences and engineering sciences. PO3 Design/Development of Solutions - Design solutions for complex engineering problems and design systems, components or processes that meet specified needs with appropriate consideration for public health and safety, cultural, societal, and environmental considerations.
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Types of Heat exchanger Fouling Factors and Typical Overall U values The Heat Exchanger Analysis: Log Mean Temperature Difference (LMTD) Correction Factors The Heat Exchanger Analysis: The Effectiveness-NTU Method CONTENTS
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It is expected that students will be able: to classify different types of heat exchangers to determine fouling factor and set up the thermal resistance network for the overall heat transfer coefficient to determine LMTD correction factor for multi-passes heat exchanger and utilize the LMTD method to solve problems related to single and multiple-passes heat exchangers to determine heat exchanger effectiveness and to evaluate the thermal performance by the NTU method TOPIC OUTCOMES
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TYPES OF HEAT EXCHANGER
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Type of Heat Exchan ger Double-pipe heat exchanger Shell and tube heat exchanger Cross flow heat exchanger
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Double-pipe heat exchanger
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Shell and Tube Heat Exchanger 1 shell pass I tube pass (1-1 exchanger) 1 shell pass 2 tube passes (1-2 exchanger)
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Shell and tube exchanger Shell inlet Shell outlet Tube inlet Tube outlet Shell inlet Tube inlet Tube outlet Shell outlet
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Cross-Flow Heat exchangers One fluid mixed, one fluid unmixed Both fluids unmixed Gas flow Gas flow
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Types of Heat exchanger Fouling Factors and Typical Overall U values The Heat Exchanger Analysis: Log Mean Temperature Difference (LMTD) Correction Factors The Heat Exchanger Analysis: The Effectiveness-NTU Method CONTENTS
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Energy Balances and Heat Transfer Rate Energy balance on hot fluid: Energy balance on cool fluid: Heat transfer rate: o h hi h p T T c m q ci co c p T T c m q m T UA q
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Distance Countercurrent Distance Co-current T 1 T’ 2 T 2 T’ 1 T 1 T’ 2 T 2 T’ 1 LOG MEAN TEMPERATURE DIFFERENCE (LMTD) 1 ' T 2 ' T 1 T 2 T T 1 2 T 1 T 1 ' T 2 T 2 ' T T 2 T 1
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T m = T lm this holds for a
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