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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074
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Enhancement of Heat Transfer Rates by Coiled Wires During Forced Convective Condensation of R-22 Inside Horizontal Tubes
ABSTRAKT
In this work, heat transfer augmentation by coiled wire inserts during forced convection condensation of R-22 inside horizontal tubes has been studied. The test-condenser consisted of four separate coaxial double pipe test sections assembled in series. It was a counter flow heat exchanger where R-22 condensed inside the inner tube by rejecting heat to the coolant flowing in the annulus. Coiled wires with different wire diameters and coil pitches were made and used in full length of test-condenser. The use of helically coiled wire was found to increase the condensing heat transfer coefficients by as much as 100 percent above the plain tube values on a nominal area basis. An empirical correlation to predict the enhanced heat transfer coefficients of this investigation was developed and presented.
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Goldstein R.J., Eckert E.R.G., Ibele W.E., Patankar S.V., Simon T.W., Kuehn T.H., Strykowski P.J., Tamma K.K., Bar-Cohen A., Heberlein J.V.R., Davidson J.H., Bischof J., Kulacki F.A., Kortshagen U., Garrick S., Heat transfer – a review of 2000 literature, International Journal of Heat and Mass Transfer, 45, 14, 2002. Crossref
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Akhavan-Behabadi M.A., Salimpour M.R., Pazouki V.A., Pressure drop increase of forced convective condensation inside horizontal coiled wire inserted tubes, International Communications in Heat and Mass Transfer, 35, 9, 2008. Crossref
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Imdad Aaqib, Ali Hassan, Farooq Haroon, Ali Hafiz, Effect of condensate flow rate, surface tension, density and vapor velocity on condensate retention of wire wrapped tubes, Thermal Science, 26, 1 Part B, 2022. Crossref