EHD enhancement of in-tube condensation heat transfer of alternate refrigerant R-134a in smooth and microfin tubes
- Copeland Corp., Sidney, OH (United States). Advanced Development Center
- Univ. of Maryland, College Park, MD (United States)
The applicability of the electrohydrodynamic (EHD) technique for in-tube condensation heat transfer enhancement of R-134a was investigated experimentally. The test section consisted of a horizontally experimentally. The test section consisted of a horizontally mounted tube-in-tube heat exchanger with test refrigerant flowing in the inner tube and water flowing in the outer tube. Two types of tubes were tested--smooth and microfin copper tubes, both 12.7 mm (0.5 in.) outside diameter and 305 mm (12 in.) long. Six different electrodes representing various electrode diameters and electrode spacing were tested. With the most optimum electrode (highest enhancement), detailed experiments were performed as a function of parametric values of inlet quality, heat flux, and mass flux. With the optimum electrode, heat transfer enhancement of as high as six-and-half-fold was found. The EHD power consumption was less than 0.08% of the condenser capacity. The pressure drop results indicated that the EHD effect introduces additional penalty.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 345281
- Report Number(s):
- CONF-9702141-; TRN: IM9922%%214
- Resource Relation:
- Conference: American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) winter meeting, Philadelphia, PA (United States), 24-28 Feb 1997; Other Information: PBD: 1997; Related Information: Is Part Of ASHRAE transactions: Technical and symposium papers, 1997. Volume 103, Part 1; PB: 1136 p.
- Country of Publication:
- United States
- Language:
- English
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