The capacity of the heat pump is mainly determined according to the heating area of the house, the height of the floor, the thermal insulation of the wall, the thermal insulation and sealing of doors and windows, etc. Houses with a large heating area and poor thermal insulation generally choose a heat pump with a large capacity; houses with a small heating area and good thermal insulation can choose a heat pump with a smaller capacity.
The selection of heat pumps is not the bigger the capacity the better, the right one is the best. If the capacity of the heat pump is selected to be large, it is easy to cause frequent startup and shutdown, and the cost will be high, resulting in unnecessary waste; but if the capacity of the heat pump is selected to be small, the heating effect will not be achieved.
Selection and calculation of heat pump
The following selection calculations are for reference only:
Floor heating: 80~90W/m2 (30~35℃ output water temps)
Fan coil unit: 90-100W/m2 (40~45℃ output water temps)
Radiator: 130-160w/m2
(This is the type selection when the house's thermal insulation effect is good. If the house's thermal insulation effect is not good, the capacity should be increased, and a higher outlet water temperature is required, preferably a heat pump above 60℃, especially the old radiator. If it is a radiator with a high heat dissipation effect, the water temperature is 55 to 60 ℃, and the hot water can slowly circulate in it to meet the heating needs of users.)
For example, for a new building of 80 square meters, the insulation effect of the house is good. The terminal equipment connected to the heat pump is floor heating, and a heat pump of about 7.2KW is required. The calculation is as follows:
0.09KW/m2 X 80m2=7.2KW heating capacity
