| Title |
Pool Boiling Heat Transfer Coefficients of Hydrocarbon Refrigerants on Various Enhanced Tubes |
| Authors |
박기정(Ki-Jung Park) ; 정동수(Dongsoo Jung) |
| Keywords |
풀비등 ; 열전달계수 ; 탄화수소계 냉매 ; 촉진관 ; 촉진비 Pool boiling ; Heat transfer coefficient ; Hydrocarbon refrigerant ; Enhanced tube ; Enhancement ratio |
| Abstract |
In this work, pool boiling heat transfer coefficients(HTCs) of five hydrocarbon refrigerants of propylene, propane, isobutane, butane and dimethylether(DME) were measured at the liquid temperature of 7℃ on a 26fpi low fin tube, Turbo-B, and Thermoexcel-E tubes. All data were taken from 80 to 10kW/m2 in the decreasing order of heat flux. The data of hydrocarbon refrigerants showed a typical trend that nucleate boiling HTCs obtained on enhanced tubes also increase with the vapor pressure. Fluids with lower reduced pressure such as DME, isobutane, and butane took more advantage of the heat transfer enhancement mechanism of enhanced tubes than those enhancement ratios of 2.3∼9.4 among the tubes tested due to its sub-channels and re-entrant cavities. |