Relative to the output temperature of 55 degrees below the 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 of 60 degrees and 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-closed piston compressors. After comparing the operating characteristics of different types of compressors, the current high-temperature heat pump equipment Semi-closed piston compressor is generally used.
* The choice of working fluid: According to the maximum working pressure of high temperature heat pump equipment is less than or equal to 25BAR, using environmentally friendly R134A as refrigerant refrigerant, no pollution to the 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 exchanger (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's long-term operation and service life, and according to the ground source temperature and the winter heat temperature, adjust the high-temperature heat pump operating conditions and conditions.
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