Antifreeze control method for a low temperature air source heat pump heater

Abstract

The invention discloses an anti-freezing control method of a low-temperature air source heat pump heater. By means of the method, a required anti-freezing level can be judged automatically according to the temperature, and then corresponding devices are started for anti-freezing treatment. When the environment temperature is not very low, a water pump is started to run intermittently, and a watersystem is made to generate current to prevent freezing; when the environment temperature is low and water is still in a low-temperature state even after a first-stage freezing prevention mode of the water pump is started, a second-stage freezing prevention mode is started, heating starts, special treatment is carried out on defrosting at low water temperature, efficiency reduction caused by excessive frosting in the running process is avoided, and the water temperature is increased quickly to prevent freezing; and under the situation that the system cannot implement the second-stage freezing prevention mode due to refrigerant absence, start failure of a compressor and the like, a third-stage freezing prevention mode can be started, and an auxiliary electric heater of the water system is started to directly heat water to increase the temperature, so that the anti-freezing effect is achieved. By adoption of three-stage anti-freezing design, freezing prevention of the water system when the air source heat pump heater is in a standby state or shutdown state or failure state under the low-temperature environment is thoroughly achieved.

Description

technical field [0001] The invention relates to an antifreeze control method for a low-temperature air source heat pump heating machine. Background technique [0002] With the implementation of national environmental protection policies, clean energy heating has been implemented in northern my country to replace traditional coal-fired heating. Driven by relevant national subsidy policies, "coal-to-electricity" and "coal-to-gas" have been widely promoted in the north. As a mature clean energy heating product, the air source heat pump heating machine has become the main heating force in the northern region with its excellent energy saving and comfort. [0003] The air source heat pump heater exchanges heat with the air outdoors through the refrigerant system, and then exchanges heat with water in a high-efficiency tank or plate heat exchanger or other types of heat exchangers to obtain high-temperature water that is pumped to the room for heating , There are also some split h...

AI Technical Summary

Problems solved by technology

Both of these methods need to discharge the water from the water system when the heating is not used in the low temperature season, and then replenish the water before use, which results in a huge waste of water resources

[0006] With the development of control technology, there are now products that drive water pumps or compressors through the control system to prevent freezing. It is no longer necessary to drain the water system before leaving home and waste water resources. However, the control method is too simple to simply determine the water temperature. Start the water pump and compressor, and stop the compressor and water pump when the water temperature is higher than a certain value

This method can prevent freezing under most environmental conditions in actual use, but many products do not consider the defrosting problem during antifreezing operation. Can't defrost, some can run defrost, and the defrost will cause the water temperature to drop

These control methods all lead to poor antifreeze effect and high energy consumption.

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