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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korea Society of Geothermal Energy Engineers
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Journal DOI :
Korea Society of Geothermal Energy Engineers
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Volume & Issues
Volume 7, Issue 2 - Dec 2011
Volume 7, Issue 1 - Jun 2011
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Economic Analysis of Various Residential Geothermal Heat Pump System Capacities
Lee, Chung-Kook ; Suh, Seung-Jik ; Kim, Jin-Sang ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 1~9
Geothermal heat pumps are known as the most efficient and environment-friendly heating and cooling system, and are also gaining acceptance in buildings. Building energy simulation program, EnergyPlus is used to calculate the energy consumption of residential buildings. This simulated energy consumption is essential for accurate economic analysis. Residential buildings with geothermal heat pumps have complex energy price structure. Electricity rates for residential buildings increase rapidly as the monthly use increases. This complex energy price structure makes the economic analysis complicated. The purpose of this study is to conduct economic comparison of residential geothermal heat pumps and provide a feasible approach in finding their economically feasible capacity.
Effect of the Design Parameters of Geothermal Heat Exchanger Design Length
Min, Kyong-Chon ; Choi, Jae-Ho ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 10~15
A ground loop heat exchanger for the ground source heat pump system is the core equipment determining the thermal performance and initial cost of the system The length and performance of the heat exchanger is dependent on the ground thermal conductivity, the operation hours, the ground loop diameter, the grout, the ground loop arrangement, the pipe placement and the design temperature. The result of this simulation shows that higher thermal conductivity of grouting materials leads to the decrease length of geothermal heat exchanger from 100.0 to 84.4%.
Analysis of Heating Energy Consumption of District Heated Apartment with respect to Reinforcement of Building Energy-saving Design Criteria
Lee, Sung-Woo ; Chung, Kwang-Seop ; Kim, Young-Il ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 16~22
Since 1970s, energy-saving design criteria of buildings has been improved through numerous revisions. The purpose of this research is to show how energy saving design criteria affects heating energy consumption of apartments using district heating. Heating energy consumption has been measured in 4 apartments located in Gyeonggi province, Korea from Nov. 1,2007 through Oct. 31, 2008. Collected data was regressed to linear correlations. Heating energy consumptions were calculated for past, present and future energy-saving design criteria, which are outdoor temperature, ventilation and insulation. The results show that present design criteria has reduced heating energy consumption by 15%, and the future criteria will reduce the energy consumption by 42% compared to the criteria before 2001.
Heat Transfer and Pressure Drop Characteristic of Plate Heat Exchanger with Corrugation Height for District Cooling System
Kwon, Oh-Kyung ; Kim, Hyeon-Joong ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 23~29
The objectives of this paper are to study the characteristics of heat transfer and pressure drop of the plate heat exchanger with corrugation height by numerical analysis. Plate heat exchanger of three types was designed, which was corrugation height 3.1mm, 2.8mm and 2.5mm. The plate heat exchanger was numerically investigated for Reynolds number in a range of 950~3,380. The temperatures of the hot side were performed at
while that of the cold side was conducted at
. The results show that the performance of heat transfer coefficient for corrugation height 2.5mm increases about 9.5~17.1% compared to that of corrugation height 3.1mm. On the other hand, the performance of pressure drop for corrugation height 2.5mm is remarkably higher than that of corrugation height 3.1mm, about 65.7~86.0%.
Experimental Study on Energy Saving Performance of Outdoor Temperature Reset Control Strategy for Central Cooling System
Kim, Dong-Cheol ; Song, Jae-Yeob ; Ahn, Byung-Cheon ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 30~36
In this study, energy saving performance of outdoor temperature reset control strategy for central cooling system is researched by experiments. Outdoor temperature reset control is the control method to change indoor air set temperature according to outdoor air temperature change. The range of indoor air set temperature is represented by the comfort temperature range of indoor air temperature offered from ASHRAE and indoor air set temperature is programmed between
by outdoor air temperature
in summer. As a result of applying outdoor temperature reset control to central cooling system, the suggested control method shows better performances of energy savings than the conventional method which indoor temperature maintains constantly.
Operation Cost Comparison of Dedicated Outdoor and Cooling + reheating Air-conditioning Systems by On-site Performance Test
Kim, Young-Il ; Kim, Jung-Min ; Chung, Kwang-Seop ; Park, Seung-Tae ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 37~42
Dedicated outdoor air(DOA) system which conditions the outdoor air separately is superior to conventional Cooling + reheating system with respect to energy consumption and indoor comfort. Since the sensible and latent load characteristics of indoor and outdoor are different, it is more efficient to treat them separately. In this study, cycle analysis and on-site performance test of DOA system have been conducted. The study shows that DOA requires 50% less equivalent energy than the conventional system. The on-site performance test of a prototype shows that the coefficient of performance(COP) of the DOA system is 37% higher than the conventional system.
Evaluation of Heat Transfer Characteristics in Double-Layered and Single-Layered Soils
Yoon, Seok ; Park, Skan ; Park, Hyun-Ku ; Go, Gyu-Hyun ; Lee, Seung-Rae ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 43~50
This paper presents how to analyze heat transfer characteristics of double-layered soils. Thermal response tests were conducted to measure the ground thermal conductivities of Joomunjin sand and double layered soils filled in a steel box of which the size is
. Double-layered soils were composed of Joomunjin sand and Kaoline clay. Each thermal conductivity of Joomunjin sand and Kaloine clay was measured by using Heat Flow Meter considering different void ratio. The ground thermal conductivity of double-layered soils was 15% smaller than that of Joomunjin sand.
Thermal Diffusivity Measurement of Backfilling Materials for Horizontal Ground Heat Exchanger Using Dual-Probe Method
Sohn, Byong-Hu ; Choi, Hang-Seok ;
Transactions of the Korea Society of Geothermal Energy Engineers, volume 7, issue 2, 2011, Pages 51~59
Storage and transfer heat in soils are governed by the soil thermal properties and these properties are therefore needed in many engineering applications, including horizontal ground heat exchanger for ground-coupled heat pumps. This paper presents the measured results of the thermal diffusivity of soils(silica, quartzite, limestone, sandstone, and masonry soils) used for the trench backfilling materials of the horizontal ground heat exchanger. To assess this thermal property, we (i) measure the soil thermal conductivities and volumetric heat capacities using dual-probe method and (ii) compare the estimates from the de Vries method of summing the heat capacities of the soil constituents. The results show that the thermal diffusivity tends to increase as dry soil begins to wet, but it approaches a constant value or even decreases as the soil continues to wet. Measurements made by using the dual-probe method agreed well with independent estimates obtained using the single-probe method.