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How much electricity does an air-to-air heat pump heating cost per day?

Published on:

2023-04-20

The daily power consumption of air source heat pump heating is mainly determined by the input power of the air source heat pump unit itself. In addition, the power consumption is also affected by factors such as regional climate, house insulation status and terminal matching type. Assuming that the air energy heat pump with an input power of 1KW, under standard working conditions, the power consumption per hour is 1KWh, but there are other factors, such as in extremely cold weather, the heat pump unit has frosting problems, and it needs to consume part of the heat to carry out Defrosting will lead to an increase in power consumption per hour, so there is no fixed power consumption standard for air energy heat pump heating.

1. The regional climate mainly depends on the average ambient temperature and humidity of the heating city in winter. The ambient temperature is -12°C and -25°C. No lower than 2.1, and it can start normally at minus 25°C. The power consumption of air energy heat pump heating is different under these two ambient temperatures. In addition, the weather humidity will determine the frequency of frosting of the unit, and frosting and defrosting will increase power consumption quantity.

2. End type, the heating end of the air energy heat pump will affect the power consumption, because the heating end requires different outlet water temperature, such as floor heating radiation, the outlet water temperature only needs to be 35-40°C, and fan coil heating is generally 40-45°C. While the temperature of the radiator is above 55°C, the old-fashioned cast iron radiator requires a higher outlet water temperature. The higher the outlet water temperature, the higher the power consumption, so the air energy heat pump with floor heating is the most energy-efficient.

3. House insulation, the insulation condition of the building will affect the calculation of the heat load, the insulation condition of the building is not very good, in the design and selection of the air energy heat pump heating, it is necessary to consider the heat loss, which will generally increase the value of the heat load, so the insulation condition A good building consumes less electricity for heating with an air source heat pump.

To sum up, the power consumption of the heat pump will be related to the regional climate, the insulation condition of the house, and the type of terminal matching (outlet water temperature). There is no fixed power consumption standard, so how to calculate the operating cost of the air energy heat pump heating?

[Example] A certain self-built villa with two floors above ground and a total construction area of ​​470㎡. Among them, the second floor is 245㎡, and the first floor is 230㎡. The air source heat pump is proposed to be used as the heat source, and it is planned to run for 14 hours at the design temperature of outdoor heating. The water temperature parameter of the heat pump is 45/40°C. Floor heating is used indoors. It is known that 370 clay brick exterior walls and insulating glass are used. According to the heating heat index recommendation table, the heat index of the second floor is 70W/㎡, and that of the first floor is 50W/㎡. The heating heat load under continuous heating: 70×245+50×230=28650W, the average energy efficiency coefficient of heating is 3, 28650/3*24=229kw, that is, the daily power consumption of the heat pump is 229kw, and the heating days are 105 days, 0.55 yuan/kWh, 229*105*0.55/470=28 yuan per square meter, that is, the heating cost of a 470 square meter villa is 28 yuan per square meter.

Note: The data is for reference only.