Energy effectivity of air source heat pump

Abstract

The paper presents the results of simulation of heat pump air-to-air. Numerical design of the main heat exchangers initially performed for a nominal re gime with heating capacity 10.5 kW: evaporator and condenser with heat exchange surface of the minimum weight of the bimetallic finned tubes with fins optimal parameters and restriction to the pressure loss. Obtained the distribution pressure losses in the heat pump circuit by the working substance of the main and auxiliary heat-exchange apparatus. The greatest losses are observed in the evaporator and indicates the maximum permissible. In the following analysis was held of the heat pump in the off-design regimes when the air tempera-ture changes, which was a source of low-grade heat. Based on this analysis reached the following conclusions: – the main influence on the energy perfection of the heat pump is an irreversible losses and outside temperature. Losses in the evaporator are crucial. At low temperatures requires a reserve heat source; – selection of the heat pump must be carried out on the basis of complex comparative analysis and optimal design for each case their use. This approach allows to select a heat pump with the best energy characteristics; – method of analysis of the conjugate heat pump air-to-air can be used with pre-adaptation for other types of heat pumps.