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Condensation Heat Transfer and Pressure Drop of R-134a in the Oblong Shell and Plate Heat Exchanger 원문보기

International journal of air-conditioning and refrigeration, v.12 no.3, 2004년, pp.158 - 167  

Park Jae-Hong (Department of Refrigeration and Air-Conditioning Engineering, Pukyong University) ,  Kim Young-Soo (College of Engineering, School of Mechanical Engineering, Pukyong University)

Abstract ▼ AI-Helper 아이콘AI-Helper

Condensation heat transfer experiments were conducted with a oblong shell and plate heat exchanger without oil in a refrigerant loop using R-134a. An experimental refrigerant loop has been developed to measure the condensation heat transfer coefficient $h_r$ and frictional pressure drop <...

주제어

#Oblong shell and plate heat exchanger   #Condensation   #R-l34a   #Heat transfer   #Pressure drop  

AI 본문요약
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제안 방법

  • Refrigerant R- 134a is circulated in a refrigerant loop. In order to obtain different test conditions of RT34a including the vapor quality, saturation temperature (pressure) and imposed heat flux, the temperature and flow rate of the working fluid in the water loop were controlled.
  • In this study, the characteristics of the condensation heat transfer and pressure drop for R-134a flowing in the oblong shell and plate heat exchanger were experimentally explored to set up database for the design of the oblong shell and plate heat exchanger.
  • To evaluate the frictional pressure drop associated with the R-134a condensation in the refrigerant channel, the frictional pressure drop Apf was calculated by subtracting the pressure losses at the test section inlet and exit ports ePport, then adding the deceleration pressure rise during the R-134a condensation ΔD* and the elevation pressure rise 血花 from the measured total pressure drop, 力旳 for the refrigerant channel. Note that for the vertical downward refrigerant flow studied here the elevation pressure rise should be added in evaluating Δ Thus

대상 데이터

  • The data acquisition unit includes a 20 channel Fluke NetDAQ 2640A recorder combined with a personal computer. The recorder was used to record the temperature and voltage data.
  • 1 and 2, respectively. The experimental system consisted of a test section, a refrigerant loop, a water loop and a data acquisition unit. Refrigerant R- 134a is circulated in a refrigerant loop.
  • The test section (oblong shell and plate heat exchanger) used in this study was formed by four commercialized SUS-304 plates. The plate surfaces were pressed to form grooved channels with a corrugated sinusoid1 shape and 45° chevron angle.
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참고문헌 (9)

  1. Kerner, J., Sjogren, S. and Svensson, L., 1987, Where plate exchangers offer advantages over shell-and-tube, Power, Vol. 131, pp.53-58 

  2. Williams, B., 1996, Heat transfer savings on a plate, Heating and Air Conditioning Journal, Apr., pp.29-31 

  3. Shah, R. K. and Wanniarachchi, A. S., 1992, Plate heat exchanger design theory in industry heat exchanger, in: J. M. Buchlin (ed.), Lecture Series, No.1991-04, Von Karman Institute for Fluid Dynamics, Belgium 

  4. Farrell, P., Wert, K. and Webb, R., 1991, Heat transfer and friction characteristics of turbulent radiator tubes, SAE Technical Paper series, No. 910197 

  5. Collier, J, G., 1982, Convective boiling and condensation, 2nd ed., McGraw-Hill Int. Book Company, pp. 32, 90-93 

  6. Shah, R. K. and Focke, W. W., 1988, Plate heat exchangers and their design theory, in: Shah, R. K., Subbarao, E. C., Mashelkar, R. A. (eds.), Heat Transfer Equipment Design, Hemisphere, Washington, DC, pp.227-254 

  7. Kline, S. J. and McClintock, F. A., 1953, Describing uncertainties in single-sample experiments, Mechanical Engineering, Vol. 75, No.1, pp. 3-12 

  8. Yan, Y.-Y., Lio, H.-C. and Lin, T.-F., 1999, Condensation heat transfer and pressure drop of refrigerant R-134a in a plate heat exchanger, Int. J. Heat and Mass Transfer 42, pp. 993-1006 

  9. Akers, W. W., Dean, H. A. and Crosser, O., 1958, Condensation heat transfer within horizontal tubes, Chem. Eng. Frog. 54, pp.89-90. 

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