Air cooling heat pump system, refrigerant leakage detection method and detection system air cooling heat pump system thereof

A refrigerant leak detecting method for an air-cooling heat pump system, wherein the method comprises:

• (i), obtaining a leak indication parameter set, wherein the leak indication parameter set at least includes, in a heating mode of the air-cooling heat pump system, a refrigerant level in a liquid reservoir and in a cooling mode of the air-cooling heat pump system, a subcooling degree;
• (ii), comparing each leak indication parameter in the leak indication parameter set with a corresponding preset indication parameter interval;
• (iii), when each leak indication parameter falls within the corresponding preset indication parameter interval, obtaining and recording a corresponding evaluated refrigerant leak amount;
• (iv), when a cumulative value of the evaluated refrigerant leak amount falls within a preset refrigerant leak interval, determining that a refrigerant leak occurs in the air-cooling heat pump system;
• when the cumulative value of the evaluated refrigerant leak amount does not fall within the preset refrigerant leak interval, returning to the step (i);
• wherein the leak indication parameter set further includes one or more of the following:
• compressor speed or compressor capacity, and expansion valve opening and superheat degrees, and compressor discharge pressure;
• wherein leak indication parameters in the leak indication parameter set are each used to indicate different refrigerant leak degrees;
• in the step (ii), the leak indication parameters in the leak indication parameter set are each compared with the corresponding preset indication parameter intervals according to a trend indicating refrigerant leak degrees from high to low;
• wherein the compressor speed or the compressor capacity;
• the expansion valve opening and superheat degrees;
• and the refrigerant level are used to indicate refrigerant leak degrees from high to low, respectively;
• or alternatively the compressor speed or compressor capacity;
• the expansion valve opening and superheat degrees;
• the compressor discharge pressure;
• and the subcooling degree are used to indicate the refrigerant leak degrees from high to low, respectively.