The key technology in high temperature ground source heat pump applications

Relative to the output temperature below 55 ℃ heat pump technology, high-temperature ground source heat pump without increasing the temperature of low-temperature heat source (ground source), the heat pump heating temperature reached 60 ℃ above, and maintain high operating efficiency and stable operating conditions , Generally need to solve the following key technologies.
Compressor options: At present, the types of compressors commonly used in heat pump equipment are screw compressors, fully enclosed scroll compressors and semi-hermetic piston compressors. After comparing the operating characteristics of different types of compressors, the current high-temperature heat pump equipment is generally used Semi-closed piston compressor;

The choice of working fluid: According to the maximum working pressure of high temperature heat pump equipment ≤ 25bar, using environmentally friendly R134a refrigerant as working fluid, pollution-free environment, no damaging effect on the ozone layer;

Circulation system design: The use of multiple independent refrigeration cycle system, sharing a water circulation system, reducing the condensing equipment operating temperature and pressure;

In the device to add a special heat exchange device (economizer), increase the stability of equipment operation;

System Control Optimization: The average compressor operating time optimization control mode to ensure the long-term stability of the unit for a long time and service life, and based on the source temperature and winter heat source temperature, adjust the high-temperature heat pump operating conditions and conditions.

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