ENERGY EFFICIENCY OF USING THE ACCUMULATED IN THE SOIL OF SOLAR ENERGY IN THE HEAT PUMP HEATING SYSTEM

Abstract

A heat pump scheme is proposed to ensure heat supply to the building, which during the heating period of the year uses the energy received in the summer by solar collectors located on this building and stored in the soil battery. A thermodynamic analysis of the efficiency of the heat pump heating system in combination with a vertical soil heat exchanger during the accumulation of solar radiation in the soil in the summer period and with the subsequent extraction of this heat from the soil in the heating period was carried out. The main operating parameters of the heat pump heating system (optimal speed of the heat carrier, minimum specific consumption of external energy, effective coefficient of transformation of the heat pump from the month of the heating period) were determined using balance equations at different values of the depth of the well and the diameter of the pipe. Graphical dependences of energy efficiency indicators on the determining parameters of the system were constructed and analyzed. The obtained ratios between the parameters can be used in calculating the optimal operating conditions of the vertical soil heat exchanger in heat pump systems of low-temperature heating in order to achieve its maximum energy efficiency.