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Thermal stratification in vertical mantle heat-exchangers with application to solar domestic hot-water systems

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  • Knudsen, S.
  • Furbo, S.

Abstract

Experimental and numerical investigations of vertical mantle heat-exchangers for solar domestic hot-water (SDHW) systems have been carried out. Two different mantle inlet positions are investigated. Experiments based on typical operation conditions are carried out to investigate how the thermal stratification is affected by different positions of the mantle inlet. The heat transfer between the solar collector fluid in the mantle and the domestic water in the tank is analysed by CFD-simulations. Furthermore, side-by-side laboratory tests have been carried out with SDHW systems with different mantle inlet-positions. It is shown that for a high inlet-temperature to the mantle, it is an advantage to have the inlet located at the top and for a low inlet temperature it is an advantage to have the inlet moved down. Marketed tanks have typically the mantle inlet located at the top of the mantle. The side-by-side laboratory tests indicate that it is an advantage to move the inlet down from the top.

Suggested Citation

  • Knudsen, S. & Furbo, S., 2004. "Thermal stratification in vertical mantle heat-exchangers with application to solar domestic hot-water systems," Applied Energy, Elsevier, vol. 78(3), pages 257-272, July.
    • Handle: RePEc:eee:appene:v:78:y:2004:i:3:p:257-272
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    1. Mondol, Jayanta Deb & Smyth, Mervyn & Zacharopoulos, Aggelos, 2011. "Experimental characterisation of a novel heat exchanger for a solar hot water application under indoor and outdoor conditions," Renewable Energy, Elsevier, vol. 36(6), pages 1766-1779.
    2. Kumar, Naveen & Chavda, Tilak & Mistry, H.N., 2010. "A truncated pyramid non-tracking type multipurpose domestic solar cooker/hot water system," Applied Energy, Elsevier, vol. 87(2), pages 471-477, February.
    3. Li, Gang, 2016. "Sensible heat thermal storage energy and exergy performance evaluations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 897-923.
    4. Osorio, J.D. & Rivera-Alvarez, A. & Swain, M. & Ordonez, J.C., 2015. "Exergy analysis of discharging multi-tank thermal energy storage systems with constant heat extraction," Applied Energy, Elsevier, vol. 154(C), pages 333-343.
    5. Ding, Tao & Meng, Zhaoming & Chen, Kailun & Fan, Guangming & Yan, Changqi, 2020. "Experimental study on thermal stratification in water tank and heat transfer characteristics of condenser in water-cooled passive residual heat removal system of molten salt reactor," Energy, Elsevier, vol. 205(C).
    6. Al-Habaibeh, Amin & Shakmak, Bubaker & Fanshawe, Simon, 2018. "Assessment of a novel technology for a stratified hot water energy storage – The water snake," Applied Energy, Elsevier, vol. 222(C), pages 189-198.
    7. 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.
    8. Mawire, Ashmore & Taole, Simeon H., 2011. "A comparison of experimental thermal stratification parameters for an oil/pebble-bed thermal energy storage (TES) system during charging," Applied Energy, Elsevier, vol. 88(12), pages 4766-4778.
    9. Sala, J.M. & González, L.M. López & Míguez, J.L. & Eguía, J.J. & Vicuña, J.E. & Juárez, M.C. & Doménech, J., 2005. "Improvement of a chain-hardening furnace by computational fluid dynamics (CFD) simulation," Applied Energy, Elsevier, vol. 81(3), pages 260-276, July.
    10. Gertzos, K.P. & Caouris, Y.G. & Panidis, Th., 2010. "Optimal design and placement of serpentine heat exchangers for indirect heat withdrawal, inside flat plate integrated collector storage solar water heaters (ICSSWH)," Renewable Energy, Elsevier, vol. 35(8), pages 1741-1750.
    11. 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.
    12. Han, Y.M. & Wang, R.Z. & Dai, Y.J., 2009. "Thermal stratification within the water tank," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(5), pages 1014-1026, June.
    13. Mawire, Ashmore, 2013. "Experimental and simulated thermal stratification evaluation of an oil storage tank subjected to heat losses during charging," Applied Energy, Elsevier, vol. 108(C), pages 459-465.
    14. Poppi, Stefano & Bales, Chris & Heinz, Andreas & Hengel, Franz & Chèze, David & Mojic, Igor & Cialani, Catia, 2016. "Analysis of system improvements in solar thermal and air source heat pump combisystems," Applied Energy, Elsevier, vol. 173(C), pages 606-623.

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