Background. The known methods to assess the efficiency of heat transformers do not consider pressure losses in the transformer circuit. These losses seem to be insignificant. However, the issue is how insignificant they are and whether they should still be considered. The purpose of the study is to modernize available methods to calculate heat transformers to take into account the impact of refrigerant pressure losses in the heat transformer circuit.
Materials and methods. The methods of assessing the efficiency of a vapor compression and absorption transformers are based on the methods of V. Maake and P.A. Trubaev, and the methods of T.V. Morozyuk and L.S. Timofeevsky, respectively. The method of A.N. Noskov has been used to clarify the efficiency of the compressor. The hydraulic resistances of heat exchangers and pipelines in the circuits of heat transformers have been determined using available methods of domestic authors. The obtained resistance values have been displayed on the P-h diagram of the cycle.
Results. A modernized method for assessing the efficiency of vapor compression and absorption heat transformers has been obtained, considering pressure losses in the circuit. Calculations of the efficiency indicators of heat transformers are carried out using the obtained methodology. The results of the calculations correspond to the experimental data obtained earlier by V.O. Mamchenko and A.A. Malyshev.
Conclusions. Pressure losses in the circuit of the vapor compression heat transformer reduce the transformation ratio for example under study by 5,4 %, and in the circuit of the absorption heat transformer by 0,4 %. Accordingly, when assessing the efficiency of vapor compression heat transformers, pressure losses play a significant role.