HEAT PUMP SYSTEM FOR AIR HEATING AND VENTILATION WITH RECUPERATOR AND RECIRCULATION OF EXHAUST AIR

Background. Today, based on the increasing use of non-renewable energy sources, which leads to their reduction in the world, more and more countries are switching to renewable energy sources. The main problem of the present is saving of natural resources of the Earth, and the use of an environmentally safe alternative. Technological progress leads to an increase in the need for energy, thermal or electric, which leads to the creation of new technologies or the improvement of existing ones. Objective. Finding the conditions for maximizing the energy efficiency of heat pump systems for air heating and ventilation of buildings by combining a heat pump and means of rational use of heat of exhaust ventilation air. Methods. In the article, a thermodynamic and numerical analysis of the energy efficiency of the heat pump system of air heating and ventilation with the heat recuperator and the recirculation of exhaust air was carried out. The analysis of existing heat pump systems was carried out and the complex of the auxiliary equipment of the heat pump system was improved. Results. A complex of equations describing the thermodynamic state of the heat pump system and the specific energy consumption of heating and ventilation are obtained. The graphs of changing the parameters of the system are shown, depending on the temperature of the outside air and the parameters of the heat utilization devices of the exhaust air. The optimal mode of operation of the heat pump system is determined and the influence of the temperature of the outside air on the operation of the heat pump is determined. Conclusions. It has been shown that the combined heat pump heating and ventilation system with heat recuperator and partial recirculation of exhaust ventilation air has the maximum energy effect when placing the mixing chamber of exhaust and fresh air flows in front of the condenser of the heat pump.