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A platform for research: civil engineering, architecture and urbanism
Experimental study on the thermal performance of tunnel lining ground heat exchangers
Highlights An innovative technology, tunnel lining GHEs was introduced. The field test of tunnel lining GHEs was introduced. The field test investigated the impact factors of heat transfer performance.
Abstract Innovative tunnel lining ground heat exchangers (GHEs) were introduced in China for the first time and applied to Linchang Tunnel in Inner Mongolia. This paper is dedicated to studying this new technology based on a field experiment at Linchang Tunnel. The experiment investigated the heat transfer performance of tunnel lining GHEs and its impact factors, including the flow rate, inlet water temperature and pipe distance. The test results show that (i) the ground temperature at a pipe distance of 50cm cannot completely recover when the intermittent ratio is 1.1, but it can completely recover at a pipe distance of 100cm; (ii) the heat exchange rate presents a linear variation with the inlet temperature of the heat carrier liquid, and on average, the heat exchange rate increases 2.494W/m for every 1°C increase in the inlet temperature; (iii) the heat exchange rate increases exponentially as the flow rate increases; (iv) the heat exchange rate shows an exponential downward trend as the running time increases, and the heat exchange rate for a pipe distance of 50cm is always higher than that for a pipe distance of 100cm during the testing.
Experimental study on the thermal performance of tunnel lining ground heat exchangers
Highlights An innovative technology, tunnel lining GHEs was introduced. The field test of tunnel lining GHEs was introduced. The field test investigated the impact factors of heat transfer performance.
Abstract Innovative tunnel lining ground heat exchangers (GHEs) were introduced in China for the first time and applied to Linchang Tunnel in Inner Mongolia. This paper is dedicated to studying this new technology based on a field experiment at Linchang Tunnel. The experiment investigated the heat transfer performance of tunnel lining GHEs and its impact factors, including the flow rate, inlet water temperature and pipe distance. The test results show that (i) the ground temperature at a pipe distance of 50cm cannot completely recover when the intermittent ratio is 1.1, but it can completely recover at a pipe distance of 100cm; (ii) the heat exchange rate presents a linear variation with the inlet temperature of the heat carrier liquid, and on average, the heat exchange rate increases 2.494W/m for every 1°C increase in the inlet temperature; (iii) the heat exchange rate increases exponentially as the flow rate increases; (iv) the heat exchange rate shows an exponential downward trend as the running time increases, and the heat exchange rate for a pipe distance of 50cm is always higher than that for a pipe distance of 100cm during the testing.
Experimental study on the thermal performance of tunnel lining ground heat exchangers
Zhang, Guozhu (author) / Xia, Caichu (author) / Yang, Yong (author) / Sun, Meng (author) / Zou, Yichuan (author)
Energy and Buildings ; 77 ; 149-157
2014-03-15
9 pages
Article (Journal)
Electronic Resource
English
Experimental study on the thermal performance of tunnel lining ground heat exchangers
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