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Temperature stratification in hot-water storage tanks

Author

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  • Hariharan, K.
  • Badrinarayana, K.
  • Srinivasa Murthy, S.
  • Krishna Murthy, M.V.

Abstract

Experiments have been carried out on a scale model of stratified hot-water storage tanks to study the effects of operating conditions on the thermoclines and on the extraction efficiency. The following parameters were varied: the cold-water temperature (from 30 to 80 °C), hot-water temperature (from 40 to 90 °C), water-flow rate (from 6 to 601/h), and LD ratio (1.56, 2.06, 3.54 and 4.0). Care was taken to keep the total volume and dD ratio the same for all tanks. It was observed that stratification improves with increasing ΔT and water flow rates. LD values between 3 and 4 are optimal. The extraction efficiency has been correlated by an analytical expression.

Suggested Citation

  • Hariharan, K. & Badrinarayana, K. & Srinivasa Murthy, S. & Krishna Murthy, M.V., 1991. "Temperature stratification in hot-water storage tanks," Energy, Elsevier, vol. 16(7), pages 977-982.
    • Handle: RePEc:eee:energy:v:16:y:1991:i:7:p:977-982
    DOI: 10.1016/0360-5442(91)90057-S
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    Cited by:

    1. Farzaneh-Gord, M. & Arabkoohsar, A. & Deymi Dasht-bayaz, M. & Farzaneh-Kord, V., 2012. "Feasibility of accompanying uncontrolled linear heater with solar system in natural gas pressure drop stations," Energy, Elsevier, vol. 41(1), pages 420-428.
    2. Li, Qiong & Huang, Xiaoqiao & Tai, Yonghang & Gao, Wenfeng & Wenxian, L. & Liu, Wuming, 2021. "Thermal stratification in a solar hot water storage tank with mantle heat exchanger," Renewable Energy, Elsevier, vol. 173(C), pages 1-11.
    3. Majumdar, Rudrodip & Saha, Sandip K. & Singh, Suneet, 2018. "Evaluation of transient characteristics of medium temperature solar thermal systems utilizing thermal stratification," Applied Energy, Elsevier, vol. 224(C), pages 69-85.
    4. Majumdar, Rudrodip & Saha, Sandip K., 2019. "Effect of varying extent of PCM capsule filling on thermal stratification performance of a storage tank," Energy, Elsevier, vol. 178(C), pages 1-20.
    5. Armstrong, P. & Ager, D. & Thompson, I. & McCulloch, M., 2014. "Improving the energy storage capability of hot water tanks through wall material specification," Energy, Elsevier, vol. 78(C), pages 128-140.

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