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지열원 히트펌프 성능 예측 및 검증 기술에 관한 연구

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Alternative Title
A study of geothermal heat pump performance prediction and assessment technique
Abstract
In nowadays Ground Source Heat Pump(GSHP) installation has been increased by average 10~30% yearly.[1]
The development of geothermal heat pump system application field like IEA(International Energy Agency) HP(Heat Pump) Annex 28, 29("heat pump performance evaluation technology", "heat pump marketplace problem") has gotten more expense and energy saving than conventional heat pump system.
GSHP system used for heating and cooling of residential and non-residential facilities that relatively used approximately 10~20℃, 50~200m deep. A comparison between a geothermal heat source system with atmospheric heat source system, shows one of advantage that geothermal heat source system temperature range more stable than atmospheric heat source system.
Although geothermal heat source system requires high initial cost, it reduces management and maintenance cost for Life Cycle Cost(LCC), which can be obtained by effective design.
The key point of geothermal technology depends on steadiness of technology, deveolopment of design technology and infrastructure installment, reaction of heat and part manufacturer.
As known the geothermal energy can be used in different fields such as: space facility heating/cooling, hot water and crop dry, argricultural green house, government public building heating/cooling etc.
The latest researches trends are focusing on soil thermal conductivity, geothermal heat pump system life cycle cost performance evaluation, reduction of the initial cost of the hybrid system and development of the geothermal heat pump system design.
This study is to develop a model to predict the soil temperature variation in KIER using its geothermal properties, such as, thermal conductivity and diffusivity.
Soil depth temperature variation is very important in the design of a proper GSHP system. This is because the size of the borehole depends on the soil temperature distribution, and this can decrease GSHP system cost. For given the thermal diffusivity and conductivity are known, the soil temperature can be predicted by either the Krarti equation or the Spitler equation. Then a comparison and analyzation of the Krarti equation and Spitler equation data with the measured data by high speed wireless ground heat exchange effectiveness tester can be performed.
The thermal conductivity, thermal diffusivity, thermal resistance and specific heat are measured by soil thermal property tester to help the limitation of high speed wireless ground heat exchange effectiveness tester measurement.
Finally, case study has been carried out to study a geothermal heat pump and its economic analysis by using RETScreen which is a renewable energy economic design tool.
Author(s)
김용환
Issued Date
2007
Awarded Date
2007. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000003934
Alternative Author(s)
Kim, Yong-Hwan
Affiliation
제주대학교 대학원
Department
대학원 기계공학과
Advisor
현명택
Table Of Contents
Ⅰ. 서론 = 1
1-1 연구배경 = 1
1-2 연구동향 = 2
1) 국외동향 = 2
2) 국내동향 = 3
1-3 연구목적 = 3
Ⅱ. 시스템 이론 = 4
2-1 지열원 히트펌프 = 4
2-2 토양의 주요 열물성값 = 7
1) 열전도율(Thermal conductivity) = 7
2) 열확산율(Thermal diffusivity) = 8
3) 열저항율(Thermal resistance) = 8
2-3 지중 온도 예측식 = 8
1) Krarti 지중 온도 예측식 = 9
2) Spitler 지중 온도 예측식 = 11
Ⅲ. 실험 장치 및 방법 = 12
3-1 지중 열교환 유효도 측정 기술 = 12
1) 초고속 무선 지중 열교환 유효도 측정장치 = 14
2) 열전도율 측정 = 18
3-2 토양 열적 특성 측정기술 및 평가 실험 = 19
1) 토양 열적 특성 측정장치 = 19
2) 토양 열적 특성 측정이론 = 19
3) 토양 열적 특성 측정장치 작동방법 = 23
3-3 토양의 수분함량 측정법 = 24
Ⅳ. 실험 결과 및 고찰 = 26
4-1 100m 보어홀의 실제측정값과 지중 온도 예측값 비교 = 26
1) 초고속 무선 지중 열교환 유효도 측정장치에 의한 지중 온도 변화 선도 = 26
2) Krarti & Spitler 지중 온도 예측식에 의한 지중 온도 변화 선도 = 28
4-2 토양의 열적 특성 파악 = 34
Ⅴ. 지열원 히트펌프 성능예측 기술 = 44
5-1 지중 열교환기 설계 프로그램 = 44
5-2 RETScreen 지중 열교환기 설계 프로그램 = 45
5-3 RETScreen 지중 열교환기 설계 프로그램 구현방법 = 48
Ⅵ. 결론 = 55
Ⅶ. 참고 문헌 = 57
Degree
Master
Publisher
제주대학교 대학원
Citation
김용환. (2007). 지열원 히트펌프 성능 예측 및 검증 기술에 관한 연구
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Faculty of Applied Energy System > Mechanical Enginering
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