| Title |
Experimental Study on Heat Transfer Characteristics of HFC134a for Enhanced Tubes Used in a Flooded Evaporator |
| Authors |
양승우(Seung-Woo Yang) ; 이영수(Young-Su Lee) ; 정진희(Jin-Hee Jeong) ; 강용태(Yong-Tae Kang) |
| Keywords |
증발열전달 ; 전열촉진관 ; 만액식 증발기 ; 동공 ; R-134a Evaporator heat transfer ; Enhanced tube ; Flooded evaporator ; Reentrant cavity ; HFC134a |
| Abstract |
The objectives of this paper are to study the characteristics of pool boiling heat transfer for enhanced tubes used in the evaporator of turbo chiller and to provide a guideline for optimum design of an evaporator using HFC134a. Three different enhanced tubes are tested at 4 different saturation temperatures. The wall super heated temperature difference ranges from 0.5℃ to 3.5℃. The refrigerant, HFC134a evaporates on the outside of the tube while the chilled water flows inside the tube. This study provides experimental heat transfer coefficients for evaporation on the enhanced tubes. It is found that the turbo-II tube provides the highest heat transfer coefficient. |