Heat pump water heater control method, control device and heat pump water heater

Abstract

The invention discloses a control method for a heat pump water heater. When a compressor is in stopped status, a first temperature value of water in a water tank and a second temperature value of water in a water inlet pipe in a hot water shell and tube heat exchanger are obtained at the same time, only when all the obtained first temperature values and second temperature values are lower than a first preset temperature value, the compressor is started. Since a mounting process for temperature measurement devices in the water inlet pipe in the hot water shell and tube heat exchanger is simpler, the two the deviation possibility generated during the temperature measurement process of the temperature measurement devices is low. Based on the control method for the heat pump water heater, the mistaken start-up possibility of the compressor in the heater pump water heater can be reduced, and the possibility that the compressor runs needlessly is reduced, so that the service life of the compressor is prolonged, and the power consumption of the system is reduced. The invention also discloses another control method, another corresponding control device and the heat pump water heater.

Description

technical field [0001] The invention belongs to the technical field of water heater control, and in particular relates to a heat pump water heater control method, a control device and the heat pump water heater. Background technique [0002] The heat pump water heater is a high-efficiency heat energy lifting and transferring device based on the reverse Carnot cycle. It uses a small amount of electric energy as power to transfer the heat of the low-temperature heat source to the water that needs to be heated to realize the heating function of the water. [0003] At present, the control method of the heat pump water heater is: install a temperature sensing package in the water tank, compare the temperature of the water body detected by the temperature sensing package with the temperature set by the user, and when the detected temperature of the water body is lower than the set temperature, turn on heat pump water heater, or when the detected water body temperature is equal to ...

AI Technical Summary

Problems solved by technology

[0004] However, the current control method for heat pump water heaters has disadvantages: in the engineering installation stage, it is necessary to open a blind hole in the water tank, and then install the temperature sensing package in the blind hole, and ensure that the temperature sensing package is in close contact with the blind hole

However, in the construction process of technicians, there are often irregular operations, such as placing the temperature sensing package in the water tank at will, or the blind hole is opened in an improper position, which will lead to deviations in the temperature detection of the temperature sensing package. Specifically, The temperature value detected by the temperature sensor is lower than the actual temperature of the water body

Therefore, based on the existing control method, it is very easy to have control deviation, resulting in unnecessary operation of the compressor. On the one hand, the running time of the compressor is prolonged, thereby shortening the service life of the compressor. On the other hand, the heat pump heat is increased The power consumption of the water machine

Images