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Experimental investigation of closed loop oscillating heat pipe as the condenser for vapor compression refrigeration.

Number: pap. n. R23, 2102

Author(s) : YEUNYONGKUL P., SAKULCHANGSATJATAI P., GHAJAR A. J.

Summary

The aim of this article is to experimentally investigate the application of a closed loop oscillating heat pipe (CLOHP) as the condenser for a vapor compression refrigeration system. Split type air conditioner for residential use has two major disadvantages. First, it has a large pressure drop in the condenser caused by the flow of refrigerant inside a very small tube which affects compressor power and results in a decrease in the coefficient of performance (COP). Second, a large amount of heat is rejected to the surroundings since the refrigerant has to condense after passing through the condenser. To decrease pressure drop and recover heat rejection from the condensing process, this study considered using CLOHP instead of the conventional condenser in the split type air conditioner. The refrigeration capacity was set at 12,500 Btu/h (3.663 kW) with R22 as the refrigerant. The simulation of CLOHP condenser for the establishment of the optimum size of the vapor compression refrigeration system was performed using the thermo-economical method. For the optimum system size, it was found that water as the working fluid provided the highest net savings. The optimum size of the system with water as the working fluid consists of a 0.08 meter of evaporator section length, a 0.1 meter of condenser section length, pipe with an inner diameter of 2.03 millimeter, and 250 turns. Therefore, these sizes were selected to construct the CLOHP condenser. The experimental results were obtained and compared with the conventional condenser. It was found that COP of CLOHP condenser with a heat load of 800 W was decreased by about 32.4% but the pressure drop of the CLOHP condenser was lower than that of the conventional condenser by about 91.2%. In addition, the energy efficiency rating of the CLOHP condenser was higher than the conventional condenser by about 13.4%. Finally, the outlet temperature of the cooling water which recovers heat from the condenser section of CLOHP, was increased by about 3°C. The same trend was also observed for the heat loads of 900 W and 1000 W.

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Pages: 8 p.

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Details

  • Original title: Experimental investigation of closed loop oscillating heat pipe as the condenser for vapor compression refrigeration.
  • Record ID : 30000978
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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