parallel and counterflow heat exchanger pdf

Parallel and counterflow heat exchanger pdf

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Parallel-flow heat exchanger

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What is Parallel-flow and Counter-flow Heat Exchanger – Definition

Category: Parallel and counterflow heat exchanger pdf

Sridharan, M. October 15, Thermal Sci. June ; 12 3 :

Parallel-flow heat exchanger

The Laplace Transform Method is applied to solve the transient response of the counter flow heat exchanger with finite wall capacitance problem. The mathematical model is based on three local energy balance equations which are solved assuming that only the fluid 1 inlet condition is perturbed step change. As any counter flow problem could be reduced to an adequate integral equation, collocation method is used for solving such equation in the presented case. Results are given for the outlet temperatures of both fluids and temperature distributions for both fluids and the wall as an explicit analytical formula. Download to read the full article text.

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. Under comparable conditions, more heat is transferred in a counter-flow arrangement than in a parallel flow heat exchanger. The temperature profiles of the two heat exchangers indicate two major disadvantages in the parallel-flow design. The design of a parallel flow heat exchanger is advantageous when two fluids are required to be brought to nearly the same temperature.

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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.

Each of the three types of heat exchangers Parallel, Cross and Counter Flow has advantages and disadvantages. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area. The efficiency of a counter flow heat exchanger is due to the fact that the average T difference in temperature between the two fluids over the length of the heat exchanger is maximized, as shown in Figure 4 Counter Flow. Therefore the log mean temperature for a counter flow heat exchanger is larger than the log mean temperature for a similar parallel or cross flow heat exchanger. This can be seen by comparing the graphs in Figure 3, Figure 4, and Figure 5. The following exercise demonstrates how the higher log mean temperature of the counter flow heat exchanger results in a larger heat transfer rate. The log mean temperature for a heat exchanger is calculated using the following equation.

What is Parallel-flow and Counter-flow Heat Exchanger – Definition

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Design and Development of Parallel -Counter Flow Heat Exchanger

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Category: Parallel and counterflow heat exchanger pdf

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4 comments

  • Rosamonde Г. 17.04.2021 at 23:58

    The heat exchanger development did by many researchers using software's, design methods, changing the designs, changing shape of tubes.

    Reply
  • Achmat H. 18.04.2021 at 05:19

    Partes de un motor electrico de corriente directa pdf electrical energy transmission and distribution pdf

    Reply
  • Liane S. 20.04.2021 at 14:53

    To browse Academia.

    Reply
  • Celsa V. 23.04.2021 at 10:48

    A heat exchanger is a system used to transfer heat between two or more fluids.

    Reply

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