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Jatuporn Kaew-On. Condensation Heat Transfer Coefficient and Pressure Drop of R-134a Flowing Through Horizontal Tubes. Master's Degree(Energy Technology). King Mongkut's University Technology Thonburi. : King Mongkut's University of Technology Thonburi, 2001.
Condensation Heat Transfer Coefficient and Pressure Drop of R-134a Flowing Through Horizontal Tubes
Name: Jatuporn Kaew-On
Organization :
King Mongkut's University Technology Thonburi. The Joint Graduate School of Energy and Environment. Department of Energy Technology
keyword:
Condensation
Abstract:
In this study, the condensation heat transfer coefficient and pressure drop forpure R-134a flowing through a smooth tube and two enhanced surface tubes Rreinvestigated. The test tubes used are 318 inch (9.52 mm) outer diameter smooth tube, a318 inch (9.52 mm) outer diameter micro-fin tube and a 5/16 inch (8.00 mm) outerdiameter micro-fin tube. Two types of experiments are performed. First, the massflux, heat flux, and saturation temperature are kept constant while the inlet quality isvaried. Second, the saturation temperature is maintained at a specific value, inlet andoutlet quality are kept constant at maximum and minimum values while the mass fluxis varied.The results from the smooth and micro-fin tubes experiment indicate that theaverage heat transfer coefficient is increased as mass flux, heat flux and averagequality increase, and as the saturation temperature is decreased. The increasing ofmass flux, and average quality, as well as the decreasing of saturated temperature,have effects on the increasing of the pressure drop. However, The effect of heat fluxon the pressure drop is found to be very small. It is also found that the micro-fin tubeshows significant performance benefits over the smooth tube. The heat transfercoefficient for 318 inch (9.52 mm) and 5/16 inch (8.00 mm) outer diameter micro-fintube are 80% to 120% and 100% to 150% higher than those of the smooth tube,respectively, The pressure drops, for 318 inch (9.52 mm) and 5/16 inch (8.00 mm)outer diameter micro-fin tubes are higher than those of the smooth tube by 10% to20% and 20% to 70%, respectively.
King Mongkut's University Technology Thonburi
Address:
Bangkok
Email:
info.lib@mail.kmutt.ac.th
Name: Somchai Wongwises
Role:
Advisor
Created:
2001
Issued:
2007-03-12
Modified:
2017-07-13
วิทยานิพนธ์/Thesis
ISBN:
9746287311
CallNumber:
JGSEE7
eng
DegreeName: Master of Philosophy
Level: Master's Degree
Descipline: Energy Technology
©copyrights King Mongkut's University of Technology Thonburi
RightsAccess:
ใช้เวลา
0.048592 วินาที
Jatuporn Kaew-On
| Title | Contributor | Type |
|---|---|---|
| Heat Transfer and Pressure Drop Characteristics of Alternative Refrigerants in Minichannels and Minichannel Heat Exchangers
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี Jatuporn Kaew-On | Somchai Wongwises | วิทยานิพนธ์/Thesis |
| Condensation heat transfer characteristics of R134a flowing inside a circular and flattened tubes
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าพระนครเหนือ Jatuporn Kaew-On;Ronee Binmud;Somchai Wongwises | บทความ/Article |
Somchai Wongwises