Heat load-carrying capacity of surface water source combined with stagnant water and river water

Abstract

This paper studies the heat load-carrying capacity characteristics of a surface water body integrated with stagnant water and river water as a heat source for water source heat pumps in winter. In the cold climate, the influence of each variable on the surface water temperature was simulated and analyzed. The results showed that the solar radiation intensity, the air temperature at the water surface and the heat pump extraction time are important factors affecting the heat load-carrying capacity of surface water body. At a simulated solar radiation intensity of 500 W/m2, the water body provided the heat pump with 25 kg/s of extracted water to keep the surface water body temperature largely stable. The heat pump extraction time affects the water extraction flow rate. The flow rate for 24 h of heat extraction per day was only 0.4 times that of 10 h of heat extraction. The replenishment flow rate can change the rate of water temperature variation and the heat load-carrying capacity of the water body. When the solar radiation intensity was 0W/m2, the average temperature drop of the water body decreased from 0.23 °C to 0.15 °C by increasing the replenishment water flow rate from 0 to 10 kg/s.