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Thermal performance of a solar assisted horizontal ground heat exchanger

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  • Al-Ameen, Yasameen
  • Ianakiev, Anton
  • Evans, Robert

Abstract

This paper presents an experimental study of a solar assisted horizontal ground heat exchanger system (HGHEs) operating as a daily heat storage unit. Initially, several soils were assessed as sensible heat storage mediums, with sand and gravel selected as the most appropriate. Then, a HGHEs was designed and connected to a 15 m2 test room with a heating load of 1 kW at Nottingham Trent University. Heating cables, simulating solar input, were used to heat the soil in the HGHEs to 70 °C, then a heat transfer fluid (HTF), was circulated through a closed loop heat exchanger to extract the stored heat. The parameters of soil backfill and HTF mass flow rate were investigated in the HGHEs. Several output flowrates ranging between 0.1 and 0.6 L/min were tested, producing discharge times varying between a few hours to a few days. The HTF mass flowrate was found to be the most significant parameter, affecting the HGHEs thermal capacity and heat exchange rates. The sand filled HGHE produced approximately 50% more hot water (T > 35 °C) during a longer duration achieving an efficiency of 78% compared to the gravel filled HGHE with a lower system efficiency of 58%. Insulating the HGHE system was found to reduce heat losses and avoid temperature fluctuations in the HGHEs. Overall, the results show the hot water quantity, temperature range and duration produced from the system were in line with low temperature district heating guidelines and can be applied to some household heating applications incorporating low flows and low temperatures.

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  • Al-Ameen, Yasameen & Ianakiev, Anton & Evans, Robert, 2017. "Thermal performance of a solar assisted horizontal ground heat exchanger," Energy, Elsevier, vol. 140(P1), pages 1216-1227.
    • Handle: RePEc:eee:energy:v:140:y:2017:i:p1:p:1216-1227
    DOI: 10.1016/j.energy.2017.08.091
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    References listed on IDEAS

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    1. Mirzanamadi, Raheb & Hagentoft, Carl-Eric & Johansson, Pär, 2020. "Coupling a Hydronic Heating Pavement to a Horizontal Ground Heat Exchanger for harvesting solar energy and heating road surfaces," Renewable Energy, Elsevier, vol. 147(P1), pages 447-463.
    2. Al-Ameen, Yasameen & Ianakiev, Anton & Evans, Robert, 2018. "Recycling construction and industrial landfill waste material for backfill in horizontal ground heat exchanger systems," Energy, Elsevier, vol. 151(C), pages 556-568.
    3. Weeratunge, Hansani & Narsilio, Guillermo & de Hoog, Julian & Dunstall, Simon & Halgamuge, Saman, 2018. "Model predictive control for a solar assisted ground source heat pump system," Energy, Elsevier, vol. 152(C), pages 974-984.
    4. Agrawal, Kamal Kumar & Misra, Rohit & Agrawal, Ghanshyam Das, 2020. "Improving the thermal performance of ground air heat exchanger system using sand-bentonite (in dry and wet condition) as backfilling material," Renewable Energy, Elsevier, vol. 146(C), pages 2008-2023.

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