Thermal charging of boreholes

Tshewang Lhendup, Lu Aye and Robert James Fuller

Renewable Energy, 2014, vol. 67, issue C, 165-172

Abstract: This paper presents experimental study of thermal charging the boreholes that are used for inter-seasonal thermal storage of heat and coolth integrated with ground-coupled heat pump and unglazed solar collectors. After 180 days of thermal charging, it was observed that the temperature of the ground at 21 m depth and 1 m distance from the borehole had increased by 2.5 °C. The unglazed collectors are able to collect heat for charging the heat storage borehole at an average of 43.9 MJ day−1. The system is able to charge borehole at an average heat transfer rate of 57 W m−1. A comparison of the experimental results with the simulated results of a TRNSYS model of the system showed a good agreement. The mean efficiency of the unglazed solar collector during 180 days charging operation was found to be 30% and the mean efficiency of the system was found to be 38%.

Keywords: Thermal charging; Unglazed solar collector; Inter-seasonal thermal storage (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (8)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:67:y:2014:i:c:p:165-172

DOI: 10.1016/j.renene.2013.11.045

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