Simulation analysis of the influence of compressor speed on a solar-assisted heat pump hot water system

Inverter compressors have great potential in improving the overall performance of the solar-assisted heat pump (SAHP) system. However, in the actual process, due to the uncontrollability of environmental factors, the relationship between compressor speed, environmental factors and system performance is complicated, so that it is difficult to obtain intuitive data through operating experiments. Therefore, based on the SAHP system, a quasi-steady-state mathematical model is established using the Engineering Equation Solver (EES). And use this model to study the relationship between compressor speed and heat pump system performance. The simulation results show that when the ambient temperature is 20°C, if the heat collection efficiency is not lower than 0.45, when the solar radiation intensity is 400, 600 and 800 W/m 2 , the best compressor speed values are 1600, 1800 and 2400 r / min, the corresponding system coefficient of performance (COP) will reach the maximum value at this time, which are 7.7, 8.6 and 8.4 respectively. In addition, compared with higher solar radiation, at lower solar radiation intensity, increasing the compressor speed can significantly increase the heating capacity of the system.