under certain environmental conditions can really achieve its economic and energy-saving. But how do we configure it?
There are four working mode for solar energy and heat pump combined.
A. Solar energy heat for domestic hot water
In most sunny days, the system works under this condition. At this time, the work of the solar circulating pump is controlled by the system controller. Base on the temp of the solar collector and the hot water tank. The heat collected by the collector is continuously used to transfer to the hot water tank through the intermediate heat exchange.
B. Solar-assisted heat pump unit heating domestic hot water
In cloudy weather, when the solar collector temperature is lower than the water temperature of the hot water tank, it ts not enough to directly heat the domestic hot water. Then the heat pump unit will start up and use air as the heat source to heat the domestic hot water in the hot water tank.
In autumn and winter, when the ambient temperature is lower than the economic operating temperature of heat pump, the heating efficiency of heat pump unit decreases and the surface of evaporator frosts. At this time, the auxiliary heating cycle of heat pump starts, and the low temperature solar hot water above the ambient temperature enters the auxiliary heat exchange of heat pump unit. The air preheated through improves the efficiency of heat pump and has the function of preventing frosting of evaporator. It can save the power consumption of heat pump unit.
C. Solar energy and heat pump unit heat domestic hot water work together
In sunshine days, if the heat consumption of the hot water system is greater than the effective heat supply of the solar collector system or the number of solar collectors are less, it can not meet the heat demand of the hot water system. Then the solar energy and heat pump unit work simultaneously to heat the hot water system.
D. Heat pump unit heat the domestic hot water
In continuous rain and snow weather, the heat required by the hot water system is provided entirely by the air source heat pump unit. At this time, the solar energy system is in standby state, and the heat pump unit works alone to heat the hot water.