POOL BOILING HEAT TRANSFER COEFFICIENTS OF HYDROCARBON REFRIGERANTS ON VARIOUS ENHANCED TUBES
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 10 kW m-2 in the decreasing order of heat flux. Hydrocarbon refrigerants` data 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 with higher reduced pressure such as propylene and propane. Finally,Thermoexcel-E showed the highest heat transfer enhancement ratios of 2.3～9.4 among the tubes tested due to its sub-channels and re-entrant cavities.
Hyun Shin PARK Ki-Jung PARK Dongsoo JUNG
Graduate student, Inha University, Incheon, 402-751, Korea Department of Mechanical Engineering, Inha University, Incheon, 402-751, Korea
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）