Air-cooled heat pump hot and cold water machine, and heat exchanger anti-freezing method and system thereof

Abstract

The invention provides a heat exchanger anti-freezing method and system of an air-cooled heat pump hot and cold water machine. The method includes the steps: acquiring an environmental temperature, a condenser outlet temperature and water inlet and outlet temperatures of a heat exchanger in real time; comparing the temperature difference between the environmental temperature and the condenser outlet temperature with a second preset temperature difference threshold value when the temperature difference between the water inlet and outlet temperatures is larger than a first preset temperature difference threshold value; controlling the air-cooled heat pump hot and cold water machine to stop and outputting fault information when the temperature difference between the environmental temperature and the condenser outlet temperature is larger than or equal to the second preset temperature difference threshold value. The risk of icing of a water side of the heat exchanger of the air-cooled heat pump hot and cold water machine is judged according to the detected temperature difference, on and off of the air-cooled heat pump hot and cold water machine are controlled, and safety and reliability of the air-cooled heat pump hot and cold water machine are improved. Besides, the invention further provides the air-cooled heat pump hot and cold water machine comprising the heat exchanger anti-freezing system of the air-cooled heat pump hot and cold water machine.

Description

technical field [0001] The invention belongs to the field of air energy water heaters, and in particular relates to an air-cooled heat pump water heater and a method and system for antifreezing a heat exchanger thereof. Background technique [0002] At present, the danger of freezing water in the heat exchanger of the air energy air-cooled heat pump hot and cold water machine and freezing the heat exchanger can be divided into two categories: (1) Freezing caused by the low temperature of the surrounding environment. For example, if the evaporator or water-cooled condenser is placed outdoors, if the temperature is below zero in winter, the heat exchanger may be damaged by freezing; (2) For icing caused by internal reasons, it may only appear on the water side of the heat exchanger. The reason is that the refrigerant is below zero. It may be that the suction pressure is too low, the evaporator inlet water temperature is too low, the water flow is too small, the water is cut o...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a heat exchanger anti-freezing method based on an air-cooled heat pump water cooler, aiming to solve the problem of freezing of the heat exchanger due to internal causes of the air-cooled heat pump water cooler, which may easily cause the entire air-cooled heat pump to freeze. The problem of complete scrapping of the water heater system

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