Parallel Flow And Counterflow Heat Exchanger Pdf

parallel flow and counterflow heat exchanger pdf

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Sridharan, M.

Heat exchangers are typically classified according to flow arrangement and type of construction. The simplest heat exchanger is one for which the hot and cold fluids move in the same or opposite directions. This heat exchanger consists of two concentric pipes of different diameters. Figure represents the directions of fluid flow in the parallel and counter-flow exchangers.

Why counter flow heat exchangers are more efficient

Sridharan, M. October 15, Thermal Sci. June ; 12 3 : The heat exchanger is a device in which heat transfer takes place between two fluids at different temperatures. Among various classifications of heat exchangers, parallel and counter flow types are used widely in many industrial applications.

Such FLESs are capable of predicting the exit temperature of heat carrier fluids and its effectiveness in an accurate manner. In total, 96 sets of experiments have been conducted for parallel and counter flow types under different combinations of the mass flow rate.

The performance accuracy of the fuzzy logic expert system is measured by comparing fuzzy predicted results with experimental data sets. Such a comparison indicates a good agreement between experimental data sets and fuzzy predicted results. The accuracy of the parallel-flow FLES in predicting the exit temperature and its effectiveness is The accuracy of the counter-flow FLES in predicting the exit temperature and its effectiveness is Sign In or Create an Account.

Sign In. Advanced Search. Skip Nav Destination Article Navigation. Close mobile search navigation Article navigation. Volume 12, Issue 3. Previous Article Next Article. Article Navigation. Research Papers. Sridharan M. Email: sridharan-mech saranathan. This Site. Google Scholar. Author and Article Information. Sridharan Assistant Professor. Jun , 12 3 : 11 pages.

Published Online: October 15, Article history Received:. Abstract The heat exchanger is a device in which heat transfer takes place between two fluids at different temperatures. Issue Section:. You do not currently have access to this content. View full article. Learn about subscription and purchase options. Product added to cart. View Metrics. Accepted Manuscript Alert. New Issue Alert. Cited By Web Of Science 2. Appl April Appl December, Numerical and experimental modeling of the thermal flow in a modern rotary transfer machine J.

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Parallel And Counter Flow Heat Exchanger Pdf

Burlingame, California, USA. July 16—18, The transient and steady-state response of single pass constant-flow concentric parallel flow, concentric counter flow heat exchangers was investigated using a finite volume method. Heat exchanger transients initiated by both step-change and sinusoidally varying hot stream inlet temperatures were investigated. The wall separating the fluid streams was modeled by conduction with thermal mass; hence the heat exchanger transient behavior is dependent on the thermal mass of the fluid streams as well as the internal wall. The outer wall is approximated as fully insulating.

In heat exchanger analysis, if the fluid inlet and outlet temperatures are specified or can be determined by simple energy balance, the LMTD method can be used; but when these temperatures are not available The NTU or The Effectiveness method is used. The effectiveness-NTU method is very useful for all the flow arrangements besides parallel flow and counterflow ones because the effectiveness of all other types must be obtained by a numerical solution of the partial differential equations and there is no analytical equation for LMTD or effectiveness, but as a function of two variables the effectiveness for each type can be presented in a single diagram. To define the effectiveness of a heat exchanger we need to find the maximum possible heat transfer that can be hypothetically achieved in a counter-flow heat exchanger of infinite length. The method proceeds by calculating the heat capacity rates i. The other fluid would change temperature more slowly along the heat exchanger length.

Heat Exchangers

It is common knowledge amongst heat exchanger designers that a counter flow heat exchanger installation is more efficient than the parallel flow alternative, but for everyone else it can be a bit of a mystery. In this article we will explain what counter flow is and why it is more efficient than parallel flow. First we need to understand what the differences are between counter flow and parallel flow. As a brief description; the term refers to the relationship between the flow directions of the hot and cold fluids. With parallel flow the fluids are travelling through the heat exchanger in the same direction where as a counter flow installation will have the fluids flowing against each other in opposite directions.

NTU method

Why counter flow heat exchangers are more efficient

The most common arrangements for flow paths within a heat exchanger are counter-flow and parallel flow. A counter-flow heat exchanger is one in which the direction of the flow of one of the working fluids is opposite to the direction to the flow of the other fluid. In a parallel flow exchanger, both fluids in the heat exchanger flow in the same direction. Figure 9 represents the directions of fluid flow in the parallel and counter-flow exchangers. Under comparable conditions, more heat is transferred in a counter-flow arrangement than in a parallel flow heat exchanger.

Heat Transfer pp Cite as. Thus far, we have been concerned with heat transfer phenomena. In this chapter, we are concerned with types of equipment that are intended to accomplish the transfer of heat. General classes of heat exchangers are described, as are general considerations of heat exchanger design.


The analysis is applied to the absorber heat exchanger. Expressions of effectiveness and number of transfer units of a counterflow heat.


Category: Parallel and counterflow heat exchanger pdf

Sridharan, M. October 15, Thermal Sci. June ; 12 3 : The heat exchanger is a device in which heat transfer takes place between two fluids at different temperatures.

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Heat exchanger description. 2. Parallel flow heat exchangers. 3. Counter flow heat exchangers. 4. Effectiveness. 5. NTU. 6. Phase Change. 7. Constant specific​.

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PDF | Heat exchangers are used widely in many industries for heat recovery or cooling purposes. This paper developed a numerical model to simulate a | Find​.

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