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M00003379
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SF-98-15-2 (RP-725) -- Ammonia Spray Evaporation Heat Transfer Performance of Single Low-Fin and Corrugated Tubes (same as 4109)
Conference Proceeding by ASHRAE, 1998
Xin Zeng, Ming Chyu, Zahid H. Ayub
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Evaporation of liquid ammonia distributed by commercial spray nozzles onto a horizontal low-fin steel tube of 3/4 in. diameter was tested. Experiments were conducted for the average local spray flow rate from 0.0139 kg/(sâ¢m) to 0.0788 kg/(sâ¢m), saturation temperature from -23.3°C to 10°C, and heat flux from 10 kW/m2 to 80 kW/m2. The effects of heat flux, saturation temperature, spray flow rate, and nozzle height were investigated. Both standard-angle and wide-angle commercial nozzles were tested. The Nu data were correlated as a function of Re, Pr, reduced pressure, and heat flux. The heat transfer coefficient data of the low-fin tube are compared with those of a corrugated tube and plain tube.
Units: SI
Citation: Symposium, ASHRAE Transactions, 1998, Vol 104, pt. 1A, San Francisco