Parameter study of dual-source heat pump

Abstract

Against the background of energy crisis and increasingly serious environmental pollution, dual-source heat pump system, as a high-efficiency and low-carbon heating technology, shows good application prospects. The system combines the forms of water and air heat sources, and the refrigerant can absorb the heat from both heat sources, so as to improve the operation efficiency and system stability. In this study, a simulation model of the dual-source heat pump system was established based on Aspen Plus, and a single-parameter sensitivity analysis method was used to systematically study the effects of the compressor outlet pressure on the coefficient of performance (COP), total energy consumption, heat exchanger area, and equipment investment cost. The results of the sensitivity analysis show that an increase in compressor outlet pressure leads to a decrease in COP and an increase in energy consumption, but reduces the heat exchange area required for the condenser and the estimated cost of the condenser; by comparing the estimated cost of the condenser and the COP, it is suggested that a balance between COP and energy consumption can be achieved by controlling the compressor outlet pressure to about 13 bar. These recommendations were made under simulated conditions with a fixed water supply temperature of 45°C and a compressor outlet pressure of 12-14 bar.