A control method, device, controller and system based on heat pump water heater

Abstract

Embodiments of the invention disclose a control method, a control device, a controller and a control system based on a heat pump water heater. The control method includes: acquiring and detecting current ambient temperature and determining a temperature range of the current ambient temperature; when the current ambient temperature changes to a holding range, referring to a temperature association table and highest hot water temperature determining record; using highest hot water temperature, determined when the ambient temperature in the highest hot water temperature determining record changes to the holding range once, as current highest hot water temperature; controlling a compressor of the heat pump water heater to start or stop according to current water temperature and current highest hot water temperature. The holding range is between two adjacent temperature ranges of determined highest hot water temperature. By the use of the control method, the control device, the controller and the control system, the problem that the compressor of the heat pump water heater starts and stops frequently when the ambient temperature frequently changes around a critical temperature is overcome, and reliability of the heat pump water heater is guaranteed.

Description

technical field [0001] The present invention relates to the technical field of heat pump water heater control, and more specifically, relates to a heat pump water heater-based control method, device, controller and system. Background technique [0002] A heat pump water heater is a device that transfers heat from a low-temperature medium to high-temperature water. Its working principle is: the evaporator absorbs heat from the ambient air to evaporate the heat-transfer working medium, the temperature and pressure of the working medium steam rise after being compressed by the compressor, and when the high-temperature steam condenses into a liquid through the condenser, the heat released is transferred to the water in the storage tank. The condensed heat transfer fluid returns to the evaporator through the expansion valve, and then is evaporated again, and so on. The heat pump water heater needs to operate when the outside temperature is -15°C-45°C. [0003] In the case of h...

AI Technical Summary

Problems solved by technology

However, when the ambient temperature fluctuates frequently near the critical ambient temperature, the compressor of the heat pump water heater will start and stop frequently, which will affect the reliability of the heat pump water heater

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