Performance Analysis of heat pump cycle using CO<Sub>2</Sub>/DME refrigerant mixture

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  • CO<Sub>2</Sub>/DME混合冷媒を用いたヒートポンプサイクルの性能解析
  • CO2/DME混合冷媒を用いたヒートポンプサイクルの性能解析
  • CO2 DME コンゴウ レイバイ オ モチイタ ヒートポンプサイクル ノ セイノウ カイセキ

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Abstract

Performance analyses have been carried out for a heat pump cycle using zeotropic refrigerant mixtures of carbon dioxide (CO2) and dimethyl ether (DME). In order to clarify the characteristics and coefficient of performance (COP) of CO2/DME heat pump cycle, the concentration of mixture was varied over a wide range. The calculation conditions were established as a hot-water supply system and the calculations were conducted by considering the heat transfer between the refrigerant and heat source/sink water. Because the heat transfer between refrigerant and heat source/sink water strongly affects on the cycle behavior, effects of the heat transfer capability parameter were investigated. The heat pump cycle is formed around the critical point for high CO2 concentration mixtures and it is formed under the critical point for low CO2 concentration mixtures. The COP has the maximum at a certain pressure for each mixture and the COPs of the mixture and pure DME are higher than that of pure CO2. Operating pressure decreases with increase of DME concentration. The effects of heat transfer between the refrigerant and heat source/sink water on characteristics of the cycle have also been clarified.

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