• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.7 no.1
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• pp.32-41
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• 1978

• Journal of Bio-Environment Control
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• v.20 no.2
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• pp.83-92
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• 2011

This study is about an analysis of surplus solar energy by important greenhouse type using Typical Meteorological Year (TMY) data which was secured in order to provide basic data for designing an optimum thermal storage system to accumulate surplus solar energy generated in greenhouses during the daytime. The 07-auto-1 and 08-auto-1 types showed similar heat budget tendencies regardless of greenhouse types. In other words, the ratios of surplus solar energy were about 20.0~29.0% regardless of greenhouse type. About 54.0~225.0% and 53.0~218.0% of required heating energy will be able to be supplemented respectively according to the greenhouse types. The 07-mono-1 and 07-mono-3 types also showed similar heat budget tendencies regardless of greenhouse types. In other words, the ratios of surplus solar energy were about 20.0~26.0% and 21.0~27.0% respectively by greenhouse type. About 57.0~211.0% and 62.0~228.0% of required heating energy will be able to be supplemented by greenhouse type. Except for Daegwallyeong and Suwon area, other regions can cover heating energy only by surplus solar energy, according to the study.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2003.04a
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• pp.44-47
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• 2003

시설재배에서 가장 시급한 과제를 꼽는다면 난방에너지 비용의 절감 대책을 들 수 있다. 시설원예농가의 경영비의 30% 이상을 차지하는 난방에너지 비용이야말로 시설원예농가의 경쟁력을 떨어뜨리고, 시설농업의 발전을 가로막는 주원인이라고 할 수 있다. 더욱이 최근의 이라크 전쟁과 화석연료자원의 고갈 예고 등 세계적인 경향 또한 우리나라 시설원예 산업의 발전에 부정적인 영향을 미치고 있는 실정이다. (중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.8
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• pp.3307-3314
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• 2012

The annual energy demand of the standard rural house models was analyzed using the DesignBuilder. Indoor temperature set-point, U-value of outer wall, type of window, and degree of ventilation were selected as simulation parameters. In all the simulation cases, heating energy demand was higher than cooling energy demand regardless of the building size. When the lower U-value of the outer wall was applied to account for the thicker insulation layer, heating energy demand was decreased while cooling energy demand was increased. However, it is better to reduce the area of outer wall which is directly exposed to outdoor air because reducing the U-value of the outer wall is not effective in decreasing heating energy demand. Among the four different window types, the double skin window is most favorable because heating energy demand is the lowest. For a fixed infiltration rate, higher ventilation rate resulted in an increased heating energy demand and had minor impact on cooling energy demand. As long as the indoor air quality is acceptable, lower ventilation rate is favorable to reduce the annual energy demand.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
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• v.7 no.2
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• pp.16-22
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• 2011

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.

• Solar Energy
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• v.15 no.3
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• pp.119-125
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• 1995

Since the using of heating energy associated with infiltration is significant in a building, the efforts to minimize the infiltration while ensuring minimum ventilation rates for various types of occupancy will be beneficial. In constrast to that many efforts have been made to reduce heat loss by improving thermal resistance of building envelope, little has been tried to reduce heat loss from infiltration. For achieving such an objective, measurement of air leakage rate will be pre-requisite as a diagnostic tool. A blower door system, a depressurization/pressurization method, was employed and it demonstrated a good potential for measuring airtightness performance of residential buildings. Based on the test results, annual energy savings for residential heating was estimated by reducing infiltration to a level of reasonably airtight or to a level of ASHRAE Standard 62-1989 for minimum ventilation.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2001.04b
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• pp.29-30
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• 2001

자연에너지원중 태양에너지를 이용한 자갈축열 태양열 온실의 난방에너지 절감효과를 분석하기 위하여 야간에 내부설정온도를 18℃로 했을 때의 자갈축열 태양열 온실과 동일한 제원의 대조온실의 난방연료소비량을 비교하였다. 자갈축열 태양열 온실의 경우 난방초기에는 연료가 대조온실에 비해 약 10%정도 더 소모되었으나 2일이 경과한 후에는 점차 난방연료소비량이 감소하였다(Fig. 2) 이러한 결과는 자갈축열 태양열 온실의 경우 주간에 온실에 투여되는 일사에 의해 축열이 이루어 질뿐만 아니라 야간에 난방을 할 경우에도 축열층의 온도가 설정온도에 도달할 때까지 축열이 이루지기 때문인 것으로 분석되었다 (Fig. 1). 3월 10일부터 3월 15일까지 6일간의 난방연료소비량이 대조온실은 167℃였으나, 자갈축열 태양열 온실은 109℃로써 대조온실에 비해 약 35%정도 난방연료 절감효과가 있는 것으로 분석되었다(Fig. 2). 6일간의 난방 후 자갈축열 태양열 온실에 난방을 중단한 결과 온실외부의 최저기온이 -2.4℃일 때 자갈축열 태양열 온실의 내부최저온도는 14℃를 유지하였으며, 이후 계속 난방을 수행하지 않은 상태에서도 주간에 축열효과로 인하여 최저외기온이 3℃전후일 때 자갈축열 태양열 온실의 내부온도는 15℃를 유지하였으나 대조온실은 5℃ 전후였다. 그리고, 일기온차가 심한 3월말에는 야간설정온도가 18℃인 경우에 자갈축열 태양열 온실의 난방연료소비량이 대조온실에 비해 월등히 적음을 알 수 있었다(Fig. 1, 2). 3월에 자갈축열 태양열 온실의 난방연료소비량은 대조온실에 비해 약 50%이상의 절감효과가 있는 것으로 나타났다./TEX>3.1cm, 2cm$\times$4.2cm 순으로 나타났다. 5. 저고리의 옆길이 곡선에 대한 평가는 진종의 중심인 겨드랑이가 5cm인 것이 가장 우수한 것으로 나타났으며, 그 다음으로 4cm, 6cm, 3cm 순으로 나타났다. 6. 이에 위의 항목들을 종합하여 제작한 연구저고리는 등길이가 28cm, 어깨선 위치는 1.75cm, 깃크기는 5cm$\times$21.5cm, 소매통 크기는 3cm$\times$4.3cm, 옆길이 곡선은 5cm로써 그 형태에 따른 신체적합성에 대한 외관 관능검사 결과로 3.83의 평균값으로 나타났고, 심미성에 대한 외관 관능검사를 항목별 평균치 값으로 종합하면 4.00의 값으로 나타났다. 또한 각 부위별 동작적합성 관능검사는 7가지 동작을 부위별 항목 평균치 결과 3.95의 유수한 저고리로 평가되었다. 본 연구 실험 결과 앞으로도 전통 저고리를 피복함에 있어 외관과 동작적합성이 좋은 저고리를 만들기 위해 지속적 연구가 요청된다. turned back than the Korean women's. Based on the above findings, a torso prototype was developed for the Chinese women by setting the body measurements in reference with their average body measurements plus minimum reserve. The reference lines were set for front/back central line, front/

• 보일러설비
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• s.78
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• pp.68-70
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• 2000

• 보일러설비
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• s.75
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• pp.73-75
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• 2000

• Journal of the Korean Society for Marine Environment & Energy
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• v.14 no.4
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• pp.301-306
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• 2011

The paper presents an analysis of the heating cycle and discusses a desalination cycle that uses lowtemperature seawater. The basic heating cycle model is the heat pump cycle, and seawater desalination is usually performed by the indirect freezing desalination method. The low temperature of the seawater (below $5^{\circ}C$) acts as the heat source of the evaporator. R-134a, R-1234yf, R-600a are used as working fluids. In the 2-stage compression cycle, the compressor's work decreased by about 15.6% from that in the 1-stage compression cycle. Further, the COP in the 2-stage cycle was 17.6% higher than that in the 1-stage cycle. In the indirect desalination cycle, the energy per unit fresh water productivity in the 2-stage cycle was 19.8% lower than that in the 1-stage cycle.