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The performance of a coiled finned-tube heat-exchanger submerged in a hot-water store: The effect of the exchanger's orientation

Author

Listed:
  • Mote, R.
  • Probert, S.D.
  • Nevrala, D.

Abstract

A coiled-pipe exchanger was employed to extract heat rapidly at relatively high temperatures from a 90-litre hot-water charged tank, the water being initially at a temperature of approximately 80°C. The free-convective movements of the water around the outside of the coiled pipe (immersed in the store) were due to buoyancy forces induced by colder water being forced through the heat-exchanger's pipe. For the heat-exchanger orientations tested, the maximum effectiveness, with respect to the quality of the heat extracted was achieved (i) by having the axis of the coiled heat-exchanger arranged horizontally with its inlet at the lowest level; and (ii) with the lower rate tested (=6·6 litre/min) of water being passed through the heat-exchanger's pipe, partly because this led to a lower rate of disruption of the stratification of the water within the store.

Suggested Citation

  • Mote, R. & Probert, S.D. & Nevrala, D., 1991. "The performance of a coiled finned-tube heat-exchanger submerged in a hot-water store: The effect of the exchanger's orientation," Applied Energy, Elsevier, vol. 38(1), pages 1-19.
    • Handle: RePEc:eee:appene:v:38:y:1991:i:1:p:1-19
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    Cited by:

    1. Li, Zhouhang & Zhai, Yuling & Bi, Dapeng & Li, Kongzhai & Wang, Hua & Lu, Junfu, 2017. "Orientation effect in helical coils with smooth and rib-roughened wall: Toward improved gas heaters for supercritical carbon dioxide Rankine cycles," Energy, Elsevier, vol. 140(P1), pages 530-545.
    2. Nash, Austin L. & Badithela, Apurva & Jain, Neera, 2017. "Dynamic modeling of a sensible thermal energy storage tank with an immersed coil heat exchanger under three operation modes," Applied Energy, Elsevier, vol. 195(C), pages 877-889.

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