Browse > Article
http://dx.doi.org/10.17664/ksgee.2017.13.4.001

Evaluation on in-situ Heat Exchange Efficiency of Energy Slab According to Pipe Materials and Configurations  

Lee, Seokjae (School of Civil, Environmental and Architectural Engineering, Korea University)
Oh, Kwanggeun (School of Civil, Environmental and Architectural Engineering, Korea University)
Han, Shin-in (R&D Center, Seoyoung Engineering)
Park, Sangwoo (Department of Civil Engineering and Environment, Korea military academy)
Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of the Korean Society for Geothermal and Hydrothermal Energy / v.13, no.4, 2017 , pp. 1-7 More about this Journal
Abstract
The energy slab is a ground coupled heat exchanger equipped in building slab structures, which represents a layout similar to the horizontal ground heat exchanger (GHEX). The energy slab is installed as one component of the floor slab layers in order to utilize the underground structure as a hybrid energy structure. However, as the energy slab is horizontally arranged, its thermal performance is inevitably less than the conventional vertical GHEXs. Therefore, stainless steel (STS) pipes are alternatively considered as a heat exchanger instead of high density polyethylene (HDPE) pipes in order to enhance thermal performance of GHEXs. Moreover, not only a floor slab but also a wall slab can be utilized as a heat-exchangeable energy slab in order to maximize the use of underground space effectively. In this paper, four field-scale energy slabs were constructed in a test bed, which consist of the STS and HDPE pipe, and a series of thermal response tests (TRTs) was conducted to evaluate relative heat exchange efficiency per unit pipe length according to the pipe material and the configuration of energy slabs. The energy slab equipped with the STS pipe shows higher thermal performance than the energy slab with the HDPE pipe. In addition, thermal performance of the wall-type energy slab is almost equivalent to the floor-type energy slab.
Keywords
Energy slab; Ground heat exchanger; Thermal response test; Stainless steel; Relative heat exchange efficiency;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Lee, C., Park, S., Won, J., Jeoung, J., Sohn, B., and Choi, H., 2012, Evaluation of thermal performance of energy textile installed in Tunnel, Renewable Energy, Vol. 42, pp. 11-22.   DOI
2 Markiewicz, R., 2004, Numerische und experimentelle Untersuchungen zur Nutzung von geothermischer Energie mittels erdberuhrter Bauteile und Neuentwicklungen fur den Tunnelbau, na.
3 Brandl, H., 2006, Energy foundations and other thermoactive ground structures, Geotechnique, Vol. 56, pp. 81-122.   DOI
4 De Moel, M., Bach, P. M., Bouazza, A., Singh, R. M., and Sun, J. O., 2010, Technological advances and applications of geothermal energy pile foundations and their feasibility in Australia, Renewable and Sustainable Energy Reviews, Vol. 14, pp. 2683-2696.   DOI
5 Park, S., Lee, D., Lee, S., Chauchois, A., and Choi, H., 2017, Experimental and numerical analysis on thermal performance of large-diameter cast-in-place energy pile constructed in soft ground, Energy, Vol. 118, pp. 297-311.   DOI
6 Choi, J-M., 2012, Heating and cooling performance of a ground coupled heat pump system with energy-slab, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 24, pp. 196-203.   DOI
7 Carslaw, H. S., and Jaeger, J. C., 1959, Conduction of heat in solids, Oxford: Clarendon Press, 2nd ed. 1959.
8 Park, S., Lee, D., Choi, H. J., Jung, K., and Choi, H., 2015, Relative constructability and thermal performance of cast-in-place concrete energy pile: Coil-type GHEX (ground heat exchanger), Energy, Vol. 81, pp. 56-66.   DOI
9 Park, S., Sung, C., Lee, D., Jung, K., and Choi, H., 2015, Evaluation on Thermal Performance Along with Constructability and Economic Feasibility of Largediameter Cast-in-place Energy Pile, Journal of the Korean Geotechnical Society, Vol. 31, No. 5, pp. 5-21.   DOI
10 Boennec, O., 2008, Shallow ground energy systems, Proceedings of the Institution of Civil Engineers-Energy, Vol. 161, pp. 57-61.
11 Choi, J-M., Sohn, B-H., 2012, Performance analysis of energy-slab ground-coupled heat exchanger, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 24, pp. 487-496.   DOI