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Improved p(t)-linear Average Method for Ground Thermal Properties Estimation during in-situ Thermal Response Test
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2015 (English)In: Procedia Engineering, Elsevier, 2015, 726-734 p.Conference paper (Refereed)Text
Abstract [en]

One potential problem for the ground coupled heat pump is that the ground thermal properties is hardly to be known due to the complicated ground construction. The p(t)-linear average method has been proved that it can improve the accuracy of borehole thermal resistance. However, the p(t)-linear fluid temperature distribution approximation is not agree well with the temperature profile measured by the fiber cable. Thus, in this paper, an improved p(t)-linear average method in which the fluid temperature distribution approximation based on the vertical temperature profile is proposed. With the new vertical temperature profile simulation model, the accuracy for the borehole thermal resistance estimation will be improved comparing to the true value. Besides that, the estimation results are sensitive with the distance between two pipes, and together with the borehole thermal resistance, the distance will be optimized by the outlet fluid temperature. The life cycle cost analysis results of a case study for an office building in Hunan University show that, although the operation cost will be increased, the total cost during the whole lifetime will be reduced with a lower initial investment.

Place, publisher, year, edition, pages
Elsevier, 2015. 726-734 p.
Keyword [en]
Fluid Temperature profile, Ground-Coupled Heat Pump, Improved p(t)-linear average method, Thermal Response Test, Air conditioning, Costs, Geothermal heat pumps, Heat pump systems, Investments, Life cycle, Office buildings, Temperature control, Temperature distribution, Thermodynamic properties, Fluid temperatures, Ground coupled heat pump, In-situ thermal response tests, Life cycle cost analysis, Linear averages, Resistance estimation, Vertical temperature profile, Cost benefit analysis
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-187501DOI: 10.1016/j.proeng.2015.09.020ISI: 000380499000099ScopusID: 2-s2.0-84957891981OAI: diva2:937015
9th International Symposium on Heating, Ventilation and Air Conditioning, ISHVAC 2015 Joint with the 3rd International Conference on Building Energy and Environment, COBEE 2015, 12 July 2015 through 15 July 2015

QC 20160614

Available from: 2016-06-14 Created: 2016-05-25 Last updated: 2016-08-30Bibliographically approved

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Acuna, José
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Applied Thermodynamics and Refrigeration
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