An experimental investigation of natural convection heat transfer over outer surface of vertical helical coil condenser

  • Rajesh Kumar National Institute of Technology Patna, India
  • Prabhansu - National Institute of Technology Patna, India
  • Prakash Chandra National Institute of Technology Patna, India
Keywords: Domestic refrigerator, existing wire-on-tube condenser, free convection, helical coil condenser, outside heat transfer coefficient.

Abstract

Free convection heat transfer over the outer surface of helical coil condenser (HCC) and existing wire-on-tube condenser (WOTC) in air was experimentally studied under steady state condition. Two types of condenser are tested: helical coil condenser of different coil diameter to tube diameter ratio and an existing wire-on-tube condenser. The experiments were conducted for turbulent flow outside, the helical coil surface as well as, conventional wire-on-tube condenser surface and comparative analysis was done. The experimental results show that decrease in diameter ratio as well as pitch leads to increase in outside heat transfer coefficient. 12.42% higher outside heat transfer coefficient was obtained for helical coil condenser in comparison with the conventional wire-on-tube condenser. It was also observed that the COP of the domestic refrigerator with designed HCC is 12.77 % higher than existing WOTC.

Author Biographies

Rajesh Kumar, National Institute of Technology Patna, India
Research Scholar, Department of Mechanical Engineering
Prabhansu -, National Institute of Technology Patna, India
Research Scholar, Department of Mechanical Engineering
Prakash Chandra, National Institute of Technology Patna, India
Associate Professor, Department of Mechanical Engineering

References

Ali, M. E. 1998. Laminar natural convection from constant heat flux helical coiled tubes. International Journal Heat Mass Transfer 41 (14):2175-2182.

Ali, M. E. 1994. Experimental investigation of natural convection from vertical helical coiled tubes. International Journal Heat Mass Transfer 37 (4):665-671.

Ali, M. E. 2004. Free convection heat transfer from the outer surface of vertically oriented helical coils in glycerol-water solution. Heat and Mass Transfer 40:615-620.

Ali, M. E. 2006. Natural convection heat transfer from vertical helical coils in oil. Heat Transfer Engineering 27 (3):1-7.

Al-Hajeri, M. H. Koluib, A. M. Mosaad, M. & AL-Kulaib, S. 2007. Heat transfer performance during condensation of R-134a inside helicoidal tubes. Energy Conversion and Management 48:2309-2315.

Amori, K. E. 2014. Thermal and hydraulic characteristics of a novel helical coiled tube used as a heat exchanger. Arab Journal Science Engieering 39:4179-4186.

Futagami, K. & Aoyama, Y. 1988. Laminar heat transfer in a helically coiled tube. International Journal Heat Mass Transfer 31 (2):387-396.

Ghorbani, N. Taherian, H. Gorji, M. & Mirgolbabaei, H. 2010.

Experimental study of mixed convection heat transfer in vertical helically coiled tube heat exchangers. Experimental Thermal and Fluid Science 34:900-905.

Janssen, L. A. M. & Hoogendoorn, C. J. 1978. Laminar convective heat transfer in helical coiled tubes. International Journal Heat Mass Transfer 21:1197-1206.

Jayakumar, J. S. Mahajani, S. M. Mandal, J. C. Vijayan, P. K. & Bhoi, R. 2008. Experimental and CFD estimation of heat transfer in helically coiled heat exchangers. Chemical Engineering Research and Design 86: 221-232.

Kays, W. Crawford, M. & Weigand, B. 2005. Convective heat and mass transfer. (McGraw Hill,Singapore).

Korane, A. B. Purandare, P. S. Mali, K. V. 2012. Pressure drop analysis of helical coil heat exchanger for circular and square-coiled pattern. International Journal of Engineering and Science Research 25 (8):361-369.

Kothandaraman, C. P. Subramanyan, S. 2010. Heat and mass transfer data book, (New age international publication, New Delhi) 34:136.

Kumbhare, B. P. Purandare, P. S. & Mali, K. V. 2012. Experimental analysis of square and circular helical coil for the heat recovery system. International Journal of Engineering and Science Research 2 5 (4):318-327.

Liebenberg, L. & Meyer, J. P. 2007. In-tube passive heat transfer enhancement in the process industry. Applied Thermal Engineering 27:2713-2726.

Lin, C. X. & Ebadian, M. A. 2007. Condensation heat transfer and pressure drop of R134a in annular helicoidal pipe at different orientations. International Journal of Heat and Mass Transfer 50:4256-4264.

Liu, S. & Sakr, M. 2013. A comprehensive review on passive heat transfer enhancements in pipe exchangers. Renewable and Sustainable Energy Reviews 19:64-81.

Mao, Y. Guo, L. Bai, B. & Zhang, X. 2010. Convective heat transfer in helical coils for constant-property and variable-property flows with high Reynolds number. Front Energy Power Engineering China 4 (4):546-552.

Mohammed, H. N. 2009. Effect of curvature ratio on the heat transfer and pressure drop in coiled tube. Diyala Journal of Engg Sci 02:1-14.

Mohammed, H. N. 2011. Experimental study of free convection in coiled tube heat exchanger with vertical orientation. Tikrit Journal of Engineering Sciences 18 (4):80-87.

Naphon, P. 2007. Thermal performance and pressure drop of the helical-coil heat exchangers with and without helically crimped fins. International Communication in Heat and Mass Transfer 34:321-323.

Neshat, E. Hossainpour, S. & Bahiraee, F. 2014. Experimental and numerical study on unsteady natural convection heat transfer in helically coiled tube heat exchangers. Heat Mass Transfer 50:877-885.

Patankar, S. V. Pratap, V. S. & Spalding, D. B. 1974. Prediction of laminar flow and heat transfer in helically coiled pipes. Journal Fluid Mech. 62:539-551.

Prabhanjan, D. G. Raghavan, G. S. V. & Rennie, T. J. 2002. Comparison of heat transfer rates between a straight tube heat exchanger and a helically coiled heat exchanger. International Communication Heat Mass Transfer 29 (2):185-191.

Prabhanjan, D. G. Rennie, T. J. & Raghavan, G. S. V. 2004. Natural convection heat transfer from helical coiled tubes. International Journal of Thermal Science 43:359-365.

Rabin, Y. & Korin, E. 1996. Thermal analysis of a helical heat exchanger for ground thermal energy storage in arid zones. International Journal Heat Mass Transfer 39 (5):1051-1065.

Rennie, T. J. & Raghavan, V. G. S. 2005. Experimental studies of a double-pipe helical heat exchanger. Experimental Thermal and Fluid Science 29:919-924.

Rennie, T. J. & Raghavan, V. G. S. 2006. Effect of fluid thermal properties on the heat transfer characteristics in a double-pipe helical heat exchanger. International Journal of Thermal Science 45:1158-1165.

Yildiz, C. Bicer Y. & Pehlivan D. 1996. Influence of fluid rotation on the heat transfer and pressure drop in double-pipe heat exchangers. Applied Energy 54 (1):49-56.

Zachar, A. 2012. Investigation of natural convection induced outer side heat transfer rate of coiled-tube heat exchangers. International Journal of Heat and Mass Transfer 55:7892-7901.

Published
2017-11-02
Section
Mechanical Engineering (1)