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Experimental research on vapor injection high temperature heat pump with an economizer.

Number: pap. 2454

Author(s) : HE Y., JIN L., CAO F., et al.

Summary

Vapor injection technique is often used in cold regions to increase heat pump’s heating capacity and decrease discharge temperature at low evaporation temperature. Injecting refrigerant vapor into port opened at specific position of compressor can increase mass flow rate of compressor and condenser. Vapor injection also changes pressure ratio of compression process and decreases discharge temperature. It’s a feasible way to improve heating performance of heat pump at cold regions. High temperature heat pump (HTHP) can provide up to 90-120°C water for industrial usage regions but there exists some problems on its usage. Total heating capacity decreases and discharge temperature increases with the raise of condensation temperature. Refrigerant temperature before expansion valve is high and may exceed working temperature range of common used electronic expansion valve (EEV). Vapor injection technique with an economizer was adopted to solve these problems. In this paper a new high temperature heat pump cycle was designed based on vapor injection and outlets water temperature of the prototype manufactured was reached to 90°C. Heating capacity, discharge temperature, compressor power consumption of the heat pump system at different amount of injected vapor was conducted by theoretical and experimental research. Adopting vapor injection could increase total heating capacity of a certain heat pump unit worked at high condensation temperature. But coefficient of performance (COP) decreased due to the increment of compressor power consumption caused by mass flow rate increment. Refrigerant temperature before expansion valve was well controlled by the usage of economizer in the experimental research.

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Pages: 9 p.

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Details

  • Original title: Experimental research on vapor injection high temperature heat pump with an economizer.
  • Record ID : 30013554
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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