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Effects of Pulsating Flow on Evaporation of Refrigerant in a Plate Heat Exchanger  

Kang Byung-Ha (School of Mechanical and Automotive Engineering, Kookmin University)
Jeong Il-Kwon (Graduate School, Kookmin University)
Kim Suk-Hyun (School of Mechanical and Automotive Engineering, Kookmin University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.8, 2006 , pp. 627-634 More about this Journal
Abstract
Evaporation heat transfer characteristics by pulsating flow in a plate heat exchanger have been investigated experimentally in this study. R-l34a is evaporated by receiving heat from the hot water in the plate heat exchanger. The pulsating frequency in refrigerant side of the plate heat exchanger is varied in the range of 5-25 Hz. The operating pressure of R-l34a and mass flux of hot water are also varied 0.6-0.9 MPa and $45-105 kg/m^2s$, respectively. The experimental results indicate that evaporation heat transfer coefficient of pulsating flow is improved up to 6.3% compared with that of the steady flow at 10 Hz and $G_w=45 kg/m^2s$. It is also found that the evaporation heat transfer enhancement ratio is decreased with an increase in mass flux of hot water, and the evaporation heat transfer enhancement is little influenced by operating pressure of R-l34a.
Keywords
Plate heat exchanger; Pulsating flow; Evaporation heat transfer enhancement ratio;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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