EuroSun2008-2

Heat exchanger model validation

In order to tune the heat exchanger model with the experimental data, the heat transfer coefficients need to be identified. For one exchanger, four heat transfer coefficients are defined: one for each zone on the refrigerant side, and one for the secondary fluid.

For given supply and exhaust temperature conditions, the condenser model predicts its pressure. Figure 7 shows that this pressure is predicted with a relative error of about 3%.

In the evaporator, the pressure is imposed by the expander and the feed pump. Given its supply temperature and the saturation pressure, the model predicts the heat flow and the exhaust temperature. Figure 8 shows that the heat flow is predicted with an error lower than 2%.