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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/18014
Title: Condensation enhancement of R-22 by twisted-tape inserts inside a horizontal tube
Authors: Kumar R.
Agarwal K.N.
Lal S.N.
Varma H.K.
Published in: Proceedings of ASHRAE Transactions
Abstract: In this paper the salient features of an experimental investigation on heat transfer enhancement by twisted-tape inserts inside a horizontal R-22 condenser are reported. The test condenser has four test sections connected in series, and each test section has an inside diameter of 12.7 mm and length of 950 mm. Three twisted-tape inserts with twist ratios, y, of 14.95, 9.05, and 5.90 were put, one by one, in the entire length of the test condenser. The refrigerant mass velocity G was varied from 210 to 372 kg/s-m2 in four steps. Enhancement in the average heat transfer coefficient h was attained up to 25% for the twisted-tape insert with the twist ratio y of 5.90, as compared to the plain tube flow. It was also found that the twisted-tape inserts are more effective at low vapor mass velocities inside the tubes. An empirical correlation equation was also developed to calculate the heat transfer coefficients. This equation predicts the experimental heat transfer coefficient within an error band of ±30% for a tube with the twisted-tape inserts. © 2005 ASHRAE.
Citation: Proceedings of ASHRAE Transactions, (2005), 18- 25. Orlando, FL
URI: http://repository.iitr.ac.in/handle/123456789/18014
Issue Date: 2005
Keywords: Condensation enhancement
Horizontal tubes
Correlation methods
Heat transfer
Refrigerants
Tubes (components)
Condensation
ISSN: 12505
Author Scopus IDs: 55389796000
7201380489
7203074890
7006817955
Author Affiliations: Kumar, R., ASHRAE, India, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Agarwal, K.N., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Lal, S.N., Bhagalpur Engineering College, Bhagalpur, India
Varma, H.K., Ideal Institute of Technology, Ghaziabad, India
Corresponding Author: Kumar, R.; Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India
Appears in Collections:Conference Publications [ME]

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