Simulation

This section explains the settings to run the dual heat exchanger simulation.

Steady state simulation - Specified inlet temperature

This section explains the settings to run the dual heat exchanger simulation for specified inlet temperature case.

Select Simulation Panel, verify that the Number of Iterations as 500 and Result Saving Frequency as 500 respectively (see, Figure 7.327).
After you save the project, click Start to run the simulation.
The result files are saved as .sres in the working folder (Example : "dual_hx_model_inlet_temp.sres"). This file is overwritten depending on the Result Saving Frequency.

The residuals of Steady State Simulation for the specified inlet temperature model are displayed under the Residual Tab in the Plot Panel (see, Figure 7.328).

Figure 7.327 - Simulation settings - Specified inlet temperature

Figure 7.328 - Residual - Specified inlet temperature

Note: The default Converge Criterion is 0.001 for steady state simulations. A steady state simulation runs until the residual for each variable drops by 3 orders or until the maximum Number of Iterations is reached, at which time a results file will be saved as: “filename.sres.

Specified heat rejection case settings

This section explains the simulation settings for the heat rejection case.

Two fluid heat exchanger model - Coolant

Select radiator_linked under Volumes in the Geometric Entities Panel.
Select Two Fluid Heat Exchanger from the Heat Exchanger drop-down list under the Heat list.
Select Specified Heat Rejection from the Heat Input drop-down list under the Heat list.
Enter the following under Heat Exchanger drop-down list of Heat module.
- Q : 160 kW
- NTU : rad_ntu

Figure 7.329 - Two fluid heat exchanger – Coolant

Steady state simulation - Specified heat rejection

This section explains the settings to run the dual heat exchanger simulation for specified heat rejection case.

Select Simulation Panel, verify that the Number of Iterations is 500.
Verify that the Result Saving Frequency is 500 (see, Figure 7.330).
After you save the project, click Start to run the simulation.
The result files are saved as .sres in the working folder (Example : "dual_hx_model_heat_rej.sres"). This file is overwritten depending on the Result Saving Frequency.

´	Note: Ensure to save the specified heat rejection case with a different file name.

The residuals of Steady State Simulation are displayed under the Residual Tab in the Plot Panel (see, Figure 7.331).

Figure 7.330 - Simulation settings - Specified heat rejection

Figure 7.331 - Residual - Specified heat rejection