Heat pump unit control method

Abstract

The invention discloses a heat pump unit control method. The heat pump unit adopted by the method is controlled by a double-expansion valve for increasing enthalpy of a compressor, and comprises a main heat exchange loop and an auxiliary air supply loop, and the main heat exchange loop and the auxiliary air supply loop are subjected to heat exchange through a first heat exchanger; the method comprises the following steps that deviation rate of an air suction superheat degree of the compressor is calculated, and the opening degree of a main throttling device is adjusted according to the deviation rate of the air suction superheat degree; an actual target superheat degree of the first heat exchanger is calculated, the opening degree of an auxiliary throttling device is adjusted according tothe actual target superheat degree of the first heat exchanger. According to the heat pump unit control method, the opening degree of the main throttling device on the main heat exchange loop and theopening degree of the auxiliary throttling device on the auxiliary air supply loop are adjusted, and then the amount of refrigerant entering the heat exchange loop and the air supply loop is adjustedcorrespondingly, so that the unit is enabled to improve the air suction temperature of a press machine of the unit under a low ambient temperature, high heat exchange of the unit at a low ambient temperature is guaranteed, and the heating capacity of the unit is improved.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a method for controlling a heat pump unit. Background technique [0002] At present, there are two types of heat pump water heaters generally sold in the heat pump water heater market in my country: air source heat pump water heaters and water source heat pump water heaters. Under normal climates, the ambient temperature is much higher than the water temperature, and the power consumed to produce hot water at the same temperature is much lower than that of water source heat pump water heaters. In the northern part of my country, the ambient temperature in the cold winter season is around -15°C, while the water temperature is generally kept above 10°C, and the northern winter generally lasts for 4 months. Heat pump water heaters are much higher. Although in the three seasons of spring, summer and autumn, air source heat pump water heaters can still meet the use requirements in...

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Problems solved by technology

[0004] In order to solve the technical problem of low heating capacity of hot water at low ambient temperature in existing air source heat pump water heaters, the present invention proposes a control method for heat pump units, which can solve the above problems

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