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http://dx.doi.org/10.7843/kgs.2014.30.7.55

Evaluation of Heat Exchange Rate in Horizontal Slinky and Coil Type Ground Heat Exchangers Considering Pitch Interval  

Yoon, Seok (Dept. of Civil and Environmental Eng., KAIST)
Lee, Seung-Rae (Dept. of Civil and Environmental Eng., KAIST)
Kim, Min-Jun (Dept. of Civil and Environmental Eng., KAIST)
Kim, Woo-Jin (Dept. of Civil and Environmental Eng., KAIST)
Go, Gyu-Hyun (Dept. of Civil and Environmental Eng., KAIST)
Jeon, Jun-Seo (Dept. of Civil and Environmental Eng., KAIST)
Publication Information
Journal of the Korean Geotechnical Society / v.30, no.7, 2014 , pp. 55-61 More about this Journal
Abstract
The need of geothermal energy is constantly increasing for economical and environmental utilization. Horizontal ground heat exchangers (GHEs) can reduce installation cost and increase efficiency. There are many kinds of GHEs, and it is known that slinky and spiral coil type GHEs show high thermal performance. Therefore, this paper presents experimental results of heat exchange rates in horizontal slinky and spiral coil type GHEs installed in a steel box whose size is $5m{\times}1m{\times}1m$. Dried Joomunjin standard sand was filled in a steel box, and thermal response tests (TRTs) were conducted for 30 hours to evaluate heat exchange rates by changing different pitch spaces of horizontal slinky and spiral coil type GHEs. As a result, spiral coil type GHE showed 30~40% higher heat exchange rates per pipe length than horizontal slinky type GHEs. Furthermore, long pitch interval (Pitch/Diameter=1) showed 200~250% higher heat exchange rates per pipe length than short pitch interval (Pitch/Diameter=0.2) in both spiral coil and horizontal slinky type GHEs, respectively.
Keywords
Horizontal ground heat exchanger; Spiral coil; Horizontal slinky; Heat exchange rate;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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