Design and development of a low-cost thermal response rig

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Title: Design and development of a low-cost thermal response rig
Authors: Hemmingway, Phil
Long, Michael (Michael M.)
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Date: 1-Aug-2012
Abstract: A thermal response test (TRT) is a controlled insitu test during which a known quantity of heat energy is injected into a closed loop heat-exchanger pipe while the heat dissipation rate into the surrounding ground is monitored. Results from a test can be interpreted to determine a number of ground thermal parameters with are vital design requirements for any medium to large scale ground source energy system. This paper describes the design and construction of a low cost TRT rig and compares the results obtained from a test using the constructed rig and a commercially built rig in order to evaluate the accuracy of the constructed equipment. The TRT rig is designed in accordance with the following principles: keep construction costs low, improve the cost-efficiency of TRT testing by incorporating remote data transmission capability and ensure attainment of sufficient accuracy to satisfy the design requirements of ground source energy systems. Analysis of data collected by the TRT rigs result in a calculated thermal conductivity of 1.9 W/mK in both cases. This value falls within the range expected for the tested geological formation and confirms the accuracy of both test rigs.
Funding Details: Irish Research Council for Science, Engineering and Technology
Type of material: Journal Article
Publisher: Institution of Civil Engineers
Journal: Proceedings of the Institution of Civil Engineers - Energy
Volume: 165
Issue: 3
Start page: 137
End page: 148
Copyright (published version): 2012 ICE Publishing Ltd.
Keywords: TRTThermal response testingGeothermalGround source energyRenewable energySite investigationResearch & development
Subject LCSH: Heat storage--Testing
Geothermal engineering
Thermal conductivity--Testing
Renewable energy sources
DOI: 10.1680/ener.11.00029
Language: en
Status of Item: Peer reviewed
Appears in Collections:Urban Institute Ireland Research Collection
Biosystems and Food Engineering Research Collection
Civil Engineering Research Collection

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