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Possibility to introduce HFO-1234ze(E) and its mixture with HFC-32 as low-GWP alternatives for heat pump/refrigeration systems.

Number: pap. NS09

Author(s) : KOYAMA S., TAKADA N., MATSUO Y., et al.

Summary

In this study the authors have investigated the possibility to introduce HFO-1234ze(E) and its mixture with HFC-32 as low-GWP alternatives for vapour compression heat pump/refrigeration systems. As the first trial, they have estimated the thermodynamic cycle performance of several refrigerants, using the REFPROP Ver.7 combined with the HFO-1234ze(E) program package, which was developed by Akasaka. The result shows that HFO-1234ze(E) is suitable as an alternative for turbo refrigeration system though its refrigeration effect is 25% lower than that of HFC-134a. It is also confirmed that a HFO-1234ze(E)/HFC-32 mixture is applicable as an alternative for domestic airconditioning system. Next, we have carried out the drop-in experiments of R410A, HFO-1234ze(E) and the mixture of 50mass%HFO-1234ze(E)/50mass%HFC-32 at heating conditions, using a compressor developed for R410A. It is found that in the case of the mixture of 50mass%HFO-1234ze(E)/50mass%HFC-32 the COP value is little affected by the degree of subcooling at the condenser outlet and it is only about 10% lower than that of R410A at the same heating load of 2.8 kW. This reveals that mixtures of HFO-1234ze(E)/HFC-32 is considered to be applicable as low-GWP alternatives for R410A by adjusting the composition of the mixture and by reconsidering the design parameters of components of room air-conditioning system. Finally, the authors have measured the vaporliquid phase equilibrium characteristics of HFO-1234ze(E)/HFC-32 mixture at isothermal condition of 292.65 K. Measured results were compared with estimated results by REFPROP Ver. 7.

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Details

  • Original title: Possibility to introduce HFO-1234ze(E) and its mixture with HFC-32 as low-GWP alternatives for heat pump/refrigeration systems.
  • Record ID : 30000467
  • Languages: English
  • Source: Measures to address climate change. 2010 International Symposium on Next-generation Air Conditioning and Refrigeration Technology: February 17-19, Tokyo, Japan.
  • Publication date: 2010/02/17

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