Ultrahigh-temperature heat pump and control method thereof

Abstract

The invention discloses an ultrahigh-temperature heat pump and a control method thereof. The ultrahigh-temperature heat pump is provided with a refrigerant purification device and comprises a precooler, a purifier and a cooling machine for providing cooling capacity for the purifier, wherein part of exhaust gas of a compressor is cooled to be in a saturated gaseous state through the precooler and then enters the purifier, purified liquid is converged with a refrigerant in an evaporator and then enters an air suction port of the compressor for circulation, and non-condensable gas is discharged into the atmosphere from a gas outlet above the purifier. A third electronic expansion valve is arranged on a liquid outlet pipeline of the purifier, the purified refrigerant cools a motor of the compressor after being throttled and depressurized through the third electronic expansion valve, and then the purified refrigerant and the refrigerant in the evaporator are converged to enter the air suction port of the compressor. According to the ultrahigh-temperature heat pump, refrigerant purification and compressor motor cooling requirements can be met at the same time, and the energy efficiency ratio of the unit is increased.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an ultra-high temperature heat pump capable of simultaneously purifying refrigerant and cooling a compressor motor and a control method thereof. Background technique [0002] R134a is often used as a refrigerant in conventional centrifugal chillers, but for ultra-high temperature heat pump systems with an outlet water temperature above 100°C, due to its high outlet water temperature, it has exceeded the critical temperature of R134a, and the GWP of commonly used refrigerant R134a ( Global warming potential) is as high as 1300, which does not meet the requirements for use and environmental protection. The use of green and environmentally friendly refrigerants has become the key to the refrigeration industry. A new refrigerant R1233zd(E) stands out because of its excellent environmental protection characteristics of ozone depletion potential ODP=0 and global warming poten...

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Problems solved by technology

[0005] The present invention proposes an ultra-high temperature heat pump and its control method that can simultaneously purify the refrigerant and cool the compressor motor, so as to solve the problem of low energy efficiency of the unit caused by the mixture of non-condensable gas in the refrigerant and the inability to meet the cooling requirements of the compressor motor in the prior art technical problem

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