• 한국신재생에너지학회:학술대회논문집
• /
• 2005.11a
• /
• pp.353-362
• /
• 2005

태양열시스템은 하절기에 급탕과 난방 부하가 적거나, 거의 없어 시스템의 과열 문제가 야기 될 수 있다. 이를 해결하는 방안 중에 하나로 흡수식 냉방시스템을 이용하여 하절기 잉여열원을 활용하여 냉방하는 방법이 대두되고 있다. 태양열 냉방시스템은 전기에너지를 대체하는 효과 뿐 아니라 태양열 연간 이용 효율 극대화에도 크게 기여 할 수 있다. 본 고에서는 국내 기술로 최초로 개발 실용화된 중온용 단일 진공관형 태양열 집열기와 1중 효용 흡수식 냉방기를 이용하여 실증연구를 계획하였다. 태양열 냉방 실증을 위하여 단일 진공관형 태양열 집열기 집열면적 200m2, 축열조(태양열, 급탕, 냉수), 10RT급 냉방기, 냉각탑, 보조 보일러, 원격 제어 및 모니터링 등이 계획 되었다. 실증시험 중간 결과 태양열 냉방시스템은 하절기 맑은 날 하루 동안 약 5 - 6시간 안정적으로 가동 되었으며, 앞으로 온수급탕, 난방 시험을 거쳐 시스템 성능 및 경제성 평가를 통하여 유용성, 안정성 및 신뢰성이 검증 될 계획이다.

• 한국태양에너지학회:학술대회논문집
• /
• 2009.04a
• /
• pp.203-208
• /
• 2009

This paper presents demonstration study results derived through field testing of a solar assisted cooling and heating system for the library of a cultural center building located in Gwangju, Korea. The area of demanded cooling and heating for building was about 350m2. Solar hot water was delivered by means of a 200m2 array of evacuated tubular solar collector (ETSC) to drive a single-effect (LiBr/H2O) absorption chiller of 10RT nominal cooling capacity. From March in 2008 to February in 2009, demonstration test were performed for solar cooling and heating system. After experiments and analysis, this study found that solar thermal system was 84% for the solar hot water supply and 12% for space heating and 4% for space cooling.

• 한국태양에너지학회:학술대회논문집
• /
• 2008.11a
• /
• pp.214-219
• /
• 2008

This study is describes thermal performance of solar cooling and hot water for demonstration system with ETSC(Evacuated tubular solar collector) installed at Seo-gu culture center of Kwanju. Control condition for solar cooling and hot water system is changed by connection of auxiliary heater. Demonstration system was connected to central air conditioning system. Demonstration system was operated by two types. First type(A) was operated to cooling and hot water supply in that order. Second type(B) was operated to hot water supply and cooling in that order. As a result. it was indicated that the total solar energy consumption of (A) was 799 MJ and the solar energy consumption rate for the cooling and hot water supply was 70% and 30% respectively. Total solar energy consumption of (b) was 898 MJ and the solar energy consumption rate for the cooling and hot water supply was 31% and 69% respectively.

• Proceedings of the SAREK Conference
• /
• 2007.11a
• /
• pp.564-569
• /
• 2007

This study describes thermal performance of solar cooling and hot water for demonstration system with ETSC(Evacuated tubular solar collector) installed at Seo-gu art center of Kwangju. For demonstration study, a reading room with about 350㎡ was heated and cooled with the solar system. The system was consisted of ETSCs, storage tank, hot water supply tank, subsidiary boiler, subsidiary tank, absorption chiller, chiller storage tank, and cooling tower. The results of the experimental study indicated that the total solar energy gain as daily performance on a sunny day (August 25, 2007) with total daily radiation of $606\;W/m^2$ was 671 kWh, the collecting efficiency of 55%. In the case of supplies to heat source more than $83^{\circ}C$, cooling time operated by solar was driven 8.8 hours, cooling energy generated by solar system was 179 kWh and the solar cooling fraction was 79.2%, and hot water supplied with surplus heat source by the solar system was 201 kWh.

• Korean Journal of Construction Engineering and Management
• /
• v.10 no.4
• /
• pp.111-118
• /
• 2009

This study is to analyze the performance of SWH(Solar Water Heating) and GSHP(Ground Source Heat Pump) systems by evaluating their energy efficiency and LCC(Life Cycle Cost) as being applied to the OO hall as a selected building in the Army. The OO hall, used as bathrooms, dining rooms, accommodations and offices, has reinforced concrete structure system with three floors above the ground and one underground, and its total floor area is approximately 2,917$m^2$. Two energy simulations are conducted to predict the yearly cooling and heating energy of the selected building: One is for analysis of an air-conditioning energy consumption using the e-Quest program, and another is for two new-renewable energy facilities as a water heating source using the RETScreen. The installed capacity of two new-renewable energy facilities is determined according to the 5% level of total standard construction cost. As a briefly result, SWH system is more energy-effective than GSHP system. Considering the break-even point, it is expected that SWH can take only 3 years 11 months to pay for itself in savings while the investment of GSHP can be recovered in more than 16 years 6 months.