JP Journal of Heat and Mass Transfer
Volume 12, Issue 2, Pages 167 - 180
(November 2015) http://dx.doi.org/10.17654/JPHMTNov2015_167_180 |
|
THERMAL PERFORMANCE MEASUREMENT ON STANDING COLUMN WELL TYPE BOREHOLE HEAT EXCHANGER
Kyungbin Lim, Sanghoon Lee and Changhee Lee
|
Abstract: Thermal performance is the most important factor for development of borehole heat exchanger utilizing geothermal energy. The thermal performance is affected by many different design parameters such as configuration type and pipe size of borehole heat exchanger. Also, this eventually determines operation and cost efficiency of borehole heat exchanger system. The main purpose of this paper is to measure and evaluate on the thermal performance of SCW geothermal heat exchanger system. For this, thermal response test rig is established with line-source theory. The test rig is composed of sub-circulation pump, a boiler, temperature sensors, flow meters and data logger system. The thermal response test is performed with additional constant input heat source. Effective thermal conductivity and thermal resistance are obtained from measured data. From the measurement, the effective thermal conductivity is found to have rather high value indicating active heat transfer for the open standing column well type heat exchanger. Meanwhile, the thermal resistance has lower value compared to computed results from design programs and this suggests modification for computing procedure. |
Keywords and phrases: standing column well type, thermal response test, effective thermal conductivity, thermal resistance. |
|
Number of Downloads: 305 | Number of Views: 1093 |
|