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The document discusses different types of heat exchangers classified based on the nature of heat exchange and flow/construction. There are direct contact, recuperators, and regenerators based on heat exchange process. Parallel flow, counter flow, and cross flow are types based on fluid flow and construction within the heat exchanger. Heat exchangers are commonly used in refrigerators, power plants, petrochemical plants, HVAC systems, engines, boilers, condensers, and pre-heaters/coolers to gain or reject heat from mechanical and chemical systems.
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This document discusses heat exchangers and provides details about different types of heat exchangers classified based on heat exchange process, fluid flow direction, physical state of fluids, and constructional features. It describes double pipe heat exchangers and the objective of the study to compare the overall heat transfer coefficient of a double pipe heat exchanger without and with twisted sheet inserts of varying twist ratios. Key terms discussed include heat exchangers, regenerators, recuperators, parallel flow, counter flow, cross flow, condensers, and evaporators.
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This document provides an overview of heat exchangers. It defines a heat exchanger as a device that transfers thermal energy between two or more fluids at different temperatures. The document outlines various applications of heat exchangers in industry and vehicles. It also describes the principles of heat transfer via exchangers and introduces several common types, including shell and tube, plate, regenerative, and adiabatic wheel exchangers. The objectives are to classify exchanger types, analyze heat transfer performance, and understand considerations for exchanger selection.
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S01226115124
This document discusses heat exchangers and provides details about different types of heat exchangers classified based on heat exchange process, fluid flow direction, physical state of fluids, and constructional features. It describes double pipe heat exchangers and the objective of the study to compare the overall heat transfer coefficient of a double pipe heat exchanger without and with twisted sheet inserts of varying twist ratios. Key terms discussed include heat exchangers, regenerators, recuperators, parallel flow, counter flow, cross flow, condensers, and evaporators.
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This document provides an overview of heat exchangers. It defines a heat exchanger as a device that transfers thermal energy between two or more fluids at different temperatures. The document outlines various applications of heat exchangers in industry and vehicles. It also describes the principles of heat transfer via exchangers and introduces several common types, including shell and tube, plate, regenerative, and adiabatic wheel exchangers. The objectives are to classify exchanger types, analyze heat transfer performance, and understand considerations for exchanger selection.
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Heat exchangers are devices that transfer heat between two fluids to control the temperature of one fluid. There are various types of heat exchangers that differ based on their flow arrangement, surface compactness, construction technique, and whether they use direct or indirect contact between fluids. Common examples include shell and tube heat exchangers, which contain multiple tubes in a shell, and plate heat exchangers, which use metal plates to transfer heat. Coaxial heat exchangers consist of an inner corrugated tube within an outer tube to efficiently transfer heat between fluids flowing separately within the tubes.
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The document discusses heat exchangers, which are devices that facilitate heat transfer between two fluids at different temperatures. It describes four common types of fluid flow configurations in heat exchangers: countercurrent, cocurrent, crossflow, and hybrid flows. It also outlines four main design configurations for heat exchangers: double-pipe, shell-and-tube, plate, and condensers/boilers. The document provides examples and diagrams to illustrate each type of flow configuration and design.
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1) Heat exchangers are devices that transfer thermal energy between two or more fluids without mixing the fluids. They are commonly used in industries like petroleum refining, power plants, and HVAC systems.
2) Heat exchangers can be classified based on fluid flow patterns (parallel, countercurrent, crossflow) and heat transfer methods. Countercurrent flow is the most efficient as it produces the highest temperature changes in each fluid.
3) Common types of heat exchangers include tubular (shell and tube, concentric tube), plate (flat plate, spiral plate), and extended surface heat exchangers. Tubular heat exchangers involve one fluid flowing inside tubes while another flows
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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.
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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
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This document discusses heat exchangers and their classification. It defines a heat exchanger as a device that transfers thermal energy between two or more fluids without mixing them. Heat exchangers are classified based on fluid flow arrangement (parallel, counter, cross flow) and heat transfer method (tubular, plate). Common examples include shell-and-tube exchangers, radiators, and cooling towers. Counter flow configuration is most efficient as it produces the largest temperature changes in each fluid. Tubular heat exchangers use concentric tubes or a shell and tube design for fluid separation. Plate heat exchangers come as flat or spiral plate types.
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This document summarizes an experiment on enhancing the heat transfer efficiency of a counter flow heat exchanger by using API SN oil and Super Kool Xtra oil. The experimental setup uses a copper tube heat exchanger with the hot fluid passing through the inside of the copper tube and the cold fluid passing over the outside. Temperature readings are taken at the inlet and outlet of both fluids. The results show that API SN oil provides greater heat transfer efficiency than water or Super Kool Xtra oil based on the temperature changes of the fluids. The heat exchanger has applications in industries involving heat transfer like oil/gas, power generation, and industrial processing.
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1) Heat exchangers are devices that transfer thermal energy between two or more fluids without mixing the fluids. They are commonly used in industries like petroleum refining, power plants, and HVAC systems.
2) Heat exchangers can be classified based on fluid flow patterns (parallel, countercurrent, crossflow) and heat transfer methods. Countercurrent flow is the most efficient as it produces the highest temperature changes in each fluid.
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Chapter 7: Heat Exchanger
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.
double pip heat exchanger lab
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
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- 3. E
- 5. Classification Based on Nature of Heat Exchange Process
- 9. 2. Classification Based On Flow And Construction Of Heat Exchanger
- 10. i) Parallel flow of heat exchangers In parallel flow of heat exchangers the hot and cold fluids with a large temperature difference enter the heat exchanger from the same end and flow parallel to each other.
- 11. ii) Counter flow of heat exchangers
- 13. iii) Cross flow of heat exchangers
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- 16. Thank You