Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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An Experimental Study on Evaperation Heat Transfer and Pressure Drop in Plated cleat Exchangers with Different Chevron Angles

판형열교환기의 세브론각에 따른 증발 열전달특성 및 압력강하에 대한 실험적 연구

  • Kim, Yun-Ho (Dept.of Mechanical Engineering, Graduate School of Korea University) ;
  • Lee, Gyu-Jeong (Dept.of Mechanical Engineering, Korea University)
  • 김윤호 (고려대학교 대학원 기계공학과) ;
  • 이규정 (고려대학교 기계공학과)
  • Published : 2002.02.01
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Abstract

Experiments on the evaporation heat transfer and pressure drop in the brazed type plate heat exchangers were performed using refrigerants R410A and R22. To investigate the geometric effect, plate heat exchangers with the same pitch and height but different 45$^{\circ}$, 35$^{\circ}$and 20$^{\circ}$chevron angles are used. Tests were conducted fur the ranges of the mass flux of refrigerant from 13 kg/m$^2$s to 34 kg/m$^2$s, the evaporation temperatures of 15$^{\circ}C$, 1$0^{\circ}C$ and 5$^{\circ}C$, vapor quality from 0.15 to 0.95 and the heat flux from 2.5 kW/m$^2$to 8.5 kW/m$^2$. The evaporation heat transfer coefficients and pressure drops were measured. Most of flow patterns are in the chum flow regime and become close to the annular flow for increasing the mass flux and the vapor quality. The heat transfer coefficient increases with increasing the evaporation temperature at a given mass flux in all plate heat exchangers. Also, the pressure drop increases with increasing the mass flux and the quality and decreasing the evaporation temperature and the chevron angle.

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References

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