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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Korea Society of Geothermal Energy Engineers
Journal Basic Information
Journal DOI :
Korea Society of Geothermal Energy Engineers
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Volume & Issues
Volume 8, Issue 4 - Dec 2012
Volume 8, Issue 3 - Sep 2012
Volume 8, Issue 2 - Jun 2012
Volume 8, Issue 1 - Mar 2012
Selecting the target year
Demand Control Application Strategies for Saving Electric Power Price of Central Cooling System
Hwang, Jin-Won ; Song, Jae-Yeob ; Ahn, Byung-Cheon ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 8, issue 4, 2012, Pages 1~7
In this study, computer simulation for demand control strategies to save the electric energy and power price in the building central cooling system is done. The demand control and outdoor reset control algorithms are applied by consideration the electric energy and power price according to the energy consumption characteristics. The suggested control methods show better responses in the power price and energy consumption in comparison with the conventional one.
Thermal Conductivity Estimate of Ground Using Energy Piles
Yoon, Seok ; Go, Gyu-Hyun ; Park, Hyun-Ku ; Park, Skhan ; Lee, Seung-Rae ; Cho, Kyung-Jin ; Song, Chi-Yong ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 8, issue 4, 2012, Pages 8~16
The use of energy pile foundation has been increased for economic utilization of geothermal energy. This paper describes an experimental and numerical study on thermal response tests (TRTs) using W and 3U-shaped ground heat exchangers (GHEs) in precast-high strength concrete (PHC) energy piles. Ground thermal conductivity and borehole thermal resistance were measured and compared with those numerical analysis. W-shpaed GHE showed higher heat transfer behavior than 3U-shaped one because of different conditions such as pile size and volume of grout. That is, ground thermal conductivity using W-shaped GHE was higher than that of 3U shaped GHE, and borehole thermal resistance vice versa. The relative error of borehole resistance values between numerical and analytical solution was less than 5%.
Economical Analysis of a Small Capacity Heat Pump utilizing Heat Sources of Air, Geothermal and Underground Water Tank using Dynamic Simulation
Yang, Chul-Ho ; Kim, Youngil ; Chung, Kwang-Seop ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 8, issue 4, 2012, Pages 17~23
Due to reinforcement of international environment regulation and high oil prices, interest in renewable energy is growing. Countries participating in UNFCCC are continuously putting efforts in reducing greenhouse gas after enforcing Kyoto Protocol into effect on Feb, 2005. Energy used in buildings, which relies heavily on fossil fuel accounts for about 24% of total energy consumption. In this study, air, geothermal and water source heat pump systems for an 322
auditorium in an office building is simulated using TRNSYS version 17 for comparing energy consumptions. The results show that energy consumptions of air, geothermal and water source heat pumps are 14,485, 10,249, and 10,405 kWh, respectively. Annual equal payments which consider both initial and running costs become 5,734,521, 6,403,257 and 5,596,058 Won. Thus, water source heat pump is the best economical choice.
Theoretical Study on the Performance in a Solar-Geothermal Hybrid R22 Heat Pump During Winter Season according to Heat Source Temperature
Kang, Byun ; Cho, Honghyun ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 8, issue 4, 2012, Pages 24~31
The Solar and geothermal energy have many advantage like low cost, non-toxic, and unlimited. But those the have very low energy efficiency. In this study, the theoretical study of performance in a sola-geothermal hybrid heat pump with operating conditions has carried out. As a result, as the solar radiation increases from 1
, the heat pump operating time decreases by 19.5% from 18 times to 14.5 times and the heat pump heat decreases by 23%. Besides, the heating COP increases by 21.4% when the evaporator inlet temperature increases from
. By adapting the geothermal system into a solar hybrid R22 heat pump, the system performance and reliability increases significantly for variable operating conditions during winter season.
Evaluation of Ground Effective Thermal Properties and Effect of Borehole Thermal Resistance on Performance of Ground Heat Exchanger
Sohn, Byonghu ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 8, issue 4, 2012, Pages 32~40
Geothermal heat pump(GHP) systems use vertical borehole heat exchangers to transfer heat to and from the surrounding ground via a heat carrier fluid that circulates between the borehole and the heat pump. An Important feature associated with design parameters and system performance is the local thermal resistances between the heat carrier flow channels in the borehole and the surrounding ground. This paper deals with the in-situ experimental determination of the effective thermal properties of the ground. The recorded thermal responses together with the line-source theory are used to determine the thermal conductivity and thermal diffusivity, and the steady-state borehole thermal resistance. In addition, this paper compares the experimental borehole resistance with the results from the different empirical and theoretical relations to evaluate this resistance. Further, the performance simulation of a GHP system with vertical borehole heat exchangers was conducted to analyze the effect of the borehole thermal resistance on the system performance.