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Performance calculations for closed-loop air-to-water solar hybrid heating systems with and without a rock bed in the solar air heater

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  • Choudhury, C.
  • Garg, H.P.

Abstract

A transient analysis has been carried out on a hybrid solar water heater which comprises a rock bed air heater with optimum design parameters in conjunction with an air-to-water transverse fin shell-and-tube heat exchanger (mixed air and unmixed water type) in which cold water from the storage tank receives heat from the hot air coming out of the air heater which flows in the shell at right angles to the water flowing in the tubes. The system's performance has been evaluated for typical winter weather conditions in Delhi for different combinations of flow rates of air and water for different volumes of the water storage tank. No hot water is assumed to be withdrawn from the tank to serve the load. A comparative analysis of the system's performance with and without a rock bed in the air heater reveals about 11°C higher temperature of storage tank in the former at 50 kg/h m2 air flow rate. With both the air heater types, although the system performance was observed to increase with the rates of air and water flow, no significant improvement in system performance was achieved at Ṁw ⩾ 2Ṁa.

Suggested Citation

  • Choudhury, C. & Garg, H.P., 1993. "Performance calculations for closed-loop air-to-water solar hybrid heating systems with and without a rock bed in the solar air heater," Renewable Energy, Elsevier, vol. 3(8), pages 897-905.
    • Handle: RePEc:eee:renene:v:3:y:1993:i:8:p:897-905
    DOI: 10.1016/0960-1481(93)90048-L
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    References listed on IDEAS

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    1. Bansal, N.K. & Kumar, Anil & Batra, A.K., 1987. "Performance equations for a closed-loop water-heating system using a solar air-heating collector," Energy, Elsevier, vol. 12(1), pages 53-57.
    2. Garg, H.P. & Choudhury, C. & Jha, Ranjana & Zaidi, Z.H., 1992. "Performance prediction of a hybrid air-to-water solar heater," Renewable Energy, Elsevier, vol. 2(3), pages 211-218.
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    Cited by:

    1. Saxena, Abhishek & Varun, & El-Sebaii, A.A., 2015. "A thermodynamic review of solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 863-890.
    2. Tchinda, Réné, 2009. "A review of the mathematical models for predicting solar air heaters systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1734-1759, October.

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    4. Garg, H.P. & Choudhury, C. & Jha, Ranjana & Zaidi, Z.H., 1992. "Performance prediction of a hybrid air-to-water solar heater," Renewable Energy, Elsevier, vol. 2(3), pages 211-218.
    5. Saxena, Abhishek & Varun, & El-Sebaii, A.A., 2015. "A thermodynamic review of solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 863-890.

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