Heat insulation control method and device for heat pump water heater and heat pump water heater

Abstract

The invention provides a heat insulation control method and device for a heat pump water heater and a heat pump water heater. The heat insulation control method comprises the following steps: acquiring the current water temperature T5 inside a water tank; comparing the current water temperature T5 inside the water tank with an acceptable temperature value TL, and when the current water temperature T5 inside the water tank is smaller than the acceptable temperature value TL, judging whether the start-up condition of a heat pump mainframe is satisfied, if yes, starting up the heat pump mainframe to heat water in the water tank, and if no, judging whether the start-up condition of an auxiliary electric heater is satisfied, if yes, starting up the auxiliary electric heater to heat water in the water tank. The heat insulation control method for the heat pump water heater can prevent frequent start and stop of the auxiliary electric heater, so that the service life of the auxiliary electric heater is prolonged; frequent starting of multiple auxiliary electric heaters is also avoided; under the premise of not influencing normal use of other electric appliances of users, water comfort degree is guaranteed for the users and the use cost is lowered.

Description

technical field [0001] The invention relates to the technical field of heat pump water heaters, in particular to a method and device for heat preservation control of a heat pump water heater, and a heat pump water heater. Background technique [0002] In the field of heat pump water heaters, due to the difficulty in manufacturing a simple high-temperature heat pump system, in order to produce high-temperature hot water, an auxiliary electric heater (that is, a heat pump electric heater) is often installed in the water tank of the existing heat pump water heater. After the heat pump is heated to the highest temperature, the hot water in the water tank is heated again by the auxiliary electric heater to achieve the purpose of producing high-temperature hot water. However, the higher the water temperature, the more obvious the temperature drop will be when the water is used or placed for a long time. How to ensure that the whole tank of water maintains a higher temperature requ...

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Problems solved by technology

[0003] In order to achieve the effect of maintaining the water temperature, in the existing heat pump water heaters, the start temperature of the heat pump and the start temperature of the auxiliary electric heater are generally set. As long as the water temperature is detected to drop to the corresponding temperature, the heat pump or the auxiliary electric heater will be turned on, although This fixed mode of heating may also meet the water demand, but the opening temperature of the auxiliary electric heater is generally higher than the opening temperature of the heat pump, and the set temperature is generally not adjustable, which leads to frequent auxiliary electric heaters. If the heat pump water heater is equipped with two or more auxiliary electric heaters, when all the electric heaters are frequently started and stopped at the same time, the power load will change greatly. Large, affecting the normal use of other electrical appliances of the customer

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