Evaporative heat transfer and enhancement performance of serpentine tubes with strip-type inserts using refrigerant-134a
- National Sun Yat-Sen Univ., Kaohsiung (Taiwan, Province of China). Dept. of Mechanical Engineering
Recent technological implications have given rise to increased interest in enhancement of the in-tube evaporation used in many air conditioning and refrigeration systems. Although many past studies have examined in-tube evaporative heat transfer enhancement and the associated pressure drop with internally finned tubes, in-tube evaporations with strip-type inserts, using R-134a as a refrigerant, have not been conducted. In addition, the fundamental phenomenon of nucleate boiling from a heated wall subject to a strip-type insert is as yet not well understood, especially for the flow in serpentine tubes. In this study, flow boiling tests were conducted in serpentine coil with inserts. To accomplish these tasks, experiments were performed in a seven-pass serpentine test tube with longitudinal strip and cross-strip types inserts, 10.6-mm inside diameter with R-134a as the boiling fluid immersed in a hot water bath.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 687538
- Journal Information:
- Journal of Heat Transfer, Vol. 121, Issue 3; Other Information: PBD: Aug 1999
- Country of Publication:
- United States
- Language:
- English
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