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- Title
Heat transfer enhancement through inner grooved copper tubes with different tube parameters.
- Authors
Rahman, M. M.; Ling, Y. M.; Soon, G. W.; Kuan, G. A.
- Abstract
This paper presents the evaluation of heat transfer coefficients for the flow of R22 through internally grooved copper tubes. A series of tests were conducted using two types of tubes namely Tube A and Tube B, which have different tube parameters. The straight and horizontal test section of the test apparatus with a length of 3.67 m was heated or cooled by water circulated in a surrounding annulus. Condensation tests were conducted at mass flux rates of 180 to 537 kg/m2s and the vapor qualities ranged from a nominal value of 83% at the test section inlet to 6% at the outlet. Evaporation tests were conducted at mass flux rates of 110 to 404 kg/m2s and the nominal vapor qualities at the inlet and outlet were 0 and 85%, respectively. For both the condensation and evaporation tests, the heat transfer coefficients are found to increase as the mass flux rate increases
- Subjects
HEAT transfer; HEAT exchangers; HEAT flux; COPPER tubes; CONDENSATION; COOLING systems; EVAPORATION (Chemistry)
- Publication
International Journal of Energy & Environment, 2012, Vol 3, Issue 1, p49
- ISSN
2076-2895
- Publication type
Article