Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Capacity Modulation of a Heat Pump System by Changing the Composition of Refrigerant Mixtures

혼합냉매의 성분비 조절을 통한 열펌프의 용량조절

  • 김민성 (서울대학교 기계항공공학부) ;
  • 김민수 (서울대학교 기계항공공학부) ;
  • 김용찬 (고려대학교 기계공학과)
  • Published : 2000.03.01
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Abstract

Experimental investigation and cycle simulation of a capacity modulation of a heat pump system using a hydrofluorocarbon (HFC) refrigerant mixture, R32/134a as an alternative to R22, have been done. In the cycle simulation, the refrigeration system was operated by assigning the temperatures of the external heat transfer fluids with the heat exchangers generalized by an average effective temperature difference. Heating capacity, cooling capacity, and coefficient of performance (COP) of the system were investigated at several operating conditions. Experimental apparatus which had a refrigeration part and a composition changing part was built, and the performance of the heat pump system filled with R32/134a mixture was investigated. A gas-liquid separator was used in the experiment to change the composition by collecting the vapor and the liquid Phase separately, The mass fraction of the charged refrigerant in the heat pump system was 40/60 and 70/30 by weight percentage. The composition of the refrigerant with initial composition of 40/60 varied from 29/71 to 41/59 in the refrigeration cycle. For the refrigerant with initial composition of 70/30, the composition varied from 65/35 to 75/25.

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References

  1. Alternative Refrigerants Evaluation Program(AREP) Technical Committee Meeting ARI
  2. DOE/ORNL Heat Pump Conf. Evaluation of nonazeotropic refrigerant mixtures for capacity modulation Vineyard, E. A.;Sand, J. R.
  3. Proc. of the SAREK'99 Summer Annual Conf. Capacity modulation of an inverter driven heat pump using R407C Lee, Y. T.;Kim, Y. C.;Kim, T. D.;Jung, I. H.
  4. Int. J. of Refrig. v.2 no.1 The use of non-azeotropic refrigerant mixtures in heat pumps for energy saving Jakobs, R.;Kruse, H.
  5. Korean J. Air-Cond. Ref. Eng. v.4 Experimental Study on the Performance of Heat Pump Using Refrigerant Mixture R22/R142b Kim, M. S.;Chang, S. D.;Ro, S. T.
  6. Multiple fluid refrigeration system Schwind, H. O. H.
  7. Means and method for modulation and controlling the capacity of a vapor compression cycle device Vakil, H. B.
  8. Int. J. Refrig. v.12 Development of rectifying circuit with mixed refrigerants Yoshida, Y.;Suzuki, S.;Mukai, Y.;Nakatani, K.;Fujiwara, K.
  9. Int. J. Refrig. v.15 A simplified cycle simulation model for the performance rating of refrigerants and refrigerant mixtures Domanski, P. A.;McLinden, M. O.
  10. Method of testing for seasonal efficiency of unitary air-conditioners and heat pump ASHRAE
  11. Thermodynamic properties of refrigerants and refrigerant mixtures database (REFPROP), Version 5.0 Huber, M.;Gallagher, J.;McLinden M.;Morrison, G.