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Journal of Biological Sciences

Year: 2003 | Volume: 3 | Issue: 12 | Page No.: 1114-1125
DOI: 10.3923/jbs.2003.1114.1125
Determination of Cooling Effect of R12 and R404A
Serap Akdemir and Selcuk Arin

Abstract: Purposes of this research as to determine cooling effect of Freon 12 (R12) and R404 A in a cold store built specifically for this research. Inlet and outlet temperature of the evaporator and condenser, compressor suction and compression pressures were measured and cooling coefficients were calculated. Required flow rate of R12 quite larger than that of R404 A because of its less evaporative specific heat. High flow rate increases compression work and consequently compressor will use more energy. Used energy per unit cooling of R12 was higher than R404 A. Capacity of condenser for R12 refrigerant was too much in spite of small cooling load. Evaporator pressure of R404 A was higher than R12. This caused to increase the vapour density and to establish more cooling effect. Suction and compression pressures of the R404 A were higher than Freon 12. High suction and compression pressure decrease compressor life. Cooling effect of system showed superiority of R404 A.

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How to cite this article
Serap Akdemir and Selcuk Arin , 2003. Determination of Cooling Effect of R12 and R404A. Journal of Biological Sciences, 3: 1114-1125.

Keywords: colling system, r-12, r404a and performance of the colling system

REFERENCES
  • Althouse, A.D., C.H. Turnquist and A.F. Bracciano, 1992. Modern Refrigeration and Air Conditioning. Goodheart Willcox Company Inc., South Holland, Illinois, USA., pp: 285

  • Anonymous, 2001. Refrigeration (installation). Turkish Mechanical Engineering Chamber. Publication No. MMO/2001/295, pp: 90-91.

  • Boumaraf, L. and A. Lallemand, 1999. Performance analysis of a jet cooling system using refrigerant mixtures. Int. J. Refrigeration, 7: 580-589.

  • Dagsoz, K.A., 1981. Refrigeration Techniques. Istanbul Technical University, Istanbul, pp: 131-139

  • Desai, M.P., R.G. Mokadam, D.C. Nguyen, F.L. Sindermann and D.B. Wigmore, 1991. Design Optimization and Development of an Energy-efficient Heat-Pump-Design. AESASME, New York, USA., pp: 39-47

  • Erol, N., 1993. Fundamental Methodologies in Refrigeration and Airconditioning. Marine High School Society, Istanbul, Turkey

  • Ersoydan, Y.A., 1967. Refrigeration-theory and problems. Ticaret Matbaac l k, Izmir.

  • Genceli, O., 1997. Refrigerants and Brines. Installation Engineering Society, UK., pp: 17.4-17.5

  • Oertel, K. and M. Fischer, 1999. Adsorption cooling system for cold storage using methanol/silicagel. Applied-Thermal-Eng., 18: 773-786.
    CrossRef    

  • Ozkol, N., 1999. Refrigeration Techniques with Applications. Turkish Machine Engineering Chamber, Turkey

  • Savas, S., 1987. Cold Storage and Staring to Refrigeration Techniques-I. Uludag University, Turkey, pp: 38-39

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