Heat Recovery, Counter and Cross Flow Plate Heat Exchangers, Paper Numerical Validation
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- The problem numerically simulates a cross-flow heat exchanger plate panel using ANSYS Fluent software.
- We design the 2-D model with the Design Modeler software.
- We Mesh the model with ANSYS Meshing software.
- The mesh type is Structured, and the element number equals 155000.
- This project is simulated and validated with a reference article.
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The present problem is a CFD simulation of a cross-flow heat exchanger plate panel by ANSYS Fluent software.
This simulation is based on the data in the reference article “Numerical model and effectiveness correlations for a run-around heat recovery system with combined counter and cross-flow exchangers,” The results are compared and validated with the results in the paper.
This heat exchanger consists of two special flow channels; In this way, the airflow flows from one side of the panel’s central panel, and the solution flows from the other side but in the opposite direction to the airflow.
This panel generally belongs to one of the two panels in the closed cycle of solution and airflow. The fluids used in the present model include air and ethylene glycol (CH2OH), although their thermophysical properties are manually defined in the Fluent.
Ethylene glycol is a colorless, odorless, low volatility, low viscosity material whose properties are defined as temperature-dependent polynomials. Also, since hot and cold flows are not integrated into this heat exchanger, there is no need to use a multiphase flow module, and on the other hand, a separating plate is used as an interface.
The geometry of the present model is designed in three dimensions using Design Modeler software.
The meshing has been done using ANSYS Meshing software, and the mesh type is structured. The element number is 155000. The cells near the wall boundaries are smaller and more accurate.
Exterior walls also act as insulation.
The solution fluid in the model has a temperature higher than the airflow; therefore, the purpose of the problem is to cool the hot air flow outlet. The general purpose of the present problem is to study the fluid behavior and heat transfer of the flows and to investigate the performance efficiency of the heat exchanger.
At the end of the simulation process, the efficiency of the heat exchanger is calculated, compared, and validated with the value obtained in the reference paper. This comparison and validation are based on the values in the diagram in Figure 11 of the article.
This diagram shows the changes in the heat exchanger efficiency (Ԑ) in the ratio xi / x0. This ratio xi / x0 is defined as the ratio of the length of the liquid flow inlet to the total length of the heat exchanger. According to the modeled geometry of the present numerical simulation, the value of this ratio in the current work is 0.1.
The relationships in the paper are used to calculate the heat exchanger efficiency. The amount of air and liquid inlet temperature was defined in the boundary conditions.
The outlet temperature of the air and fluid was obtained. It should be noted that the heat transfer from the cold fluid to the hot fluid during the simulation process equals the heat transfer from the hot fluid to the cold fluid.
|Present simulation||Paper result|
|Effectiveness based on xi/x0||0.665||0.716|
Also, according to the relations and calculations mentioned above, the ratio of the heat capacity of the liquid to the air can be calculated. According to the diagram in Figure 19, the efficiency of the heat exchanger can be obtained in the amount of the mentioned ratio and be compared with the calculated efficiency according to the above relations.
|Present simulation||Paper result|
|Effectiveness based on CL/CA||0.665||0.580|
Also, two-dimensional contours related to temperature, pressure and velocity have been obtained in two sections, X-Z and Y-Z, and two-dimensional path lines.