3.2. Test procedure
The cooling capacity, Qf, and the COP are the most frequently adopted parameters to measure the efficiency and the range Fig. 4 e Diagram of the experimental system. Table 5 of application of a refrigeration system. The former represents the ability of a cooling system to remove heat from a low temperature ambient, while the latter is defined as the ratio between the cooling capacity and the supplied electric power. Both these parameters are significantly affected by the temperatures inside and outside the thermostatic chamber. In the experimental tests, Qf is calculated in stationary conditions, i.e. maintaining a constant temperature inside the thermostatic chamber through the aforementioned resistors, and according to Equation (1).