• 자원ㆍ환경경제연구
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• 제9권5호
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• pp.925-945
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• 2000

This paper analyses the impact of energy-saving investment on Greenhouse gas emissions using a model of energy demand in Korea. SUR method was employed to estimate the demand equation. The econometric estimates provide information about the energy price divisia index, sector income, and energy saving-investment elasticities of energy demand. Except for energy price divisia, the elasticities of each variable are statistically significant. Also, the price and substitution elasticities of each energy price are similar to the results reported by the previous studies. The energy-saving investment is statistically significant and elasticities of each sector is inelastic. Using the coefficient of energy-saving investment and carbon transmission coefficient, the amount of reduction of energy demand and the reduction of carbon emissions can be estimated. The simulation is performed with the scenario that the energy-saving investment increase by 10~50%, keeping up with Equipment Investment Plan of 30% increase in energy-saving investment by 2000. The results show that the reduction of energy demand measured as 11.2% based upon 1995's level of the energy demand, in industrial sector. Accordingly, the carbon emissions will be reduced by 11.3% based upon 1995's level of the carbon emissions in industrial sector.

• 자원ㆍ환경경제연구
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• 제16권3호
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• pp.485-510
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• 2007

본 연구에서는 우리나라 제조업의 전체 에너지절약 투자액과 에너지원단위 자료를 이용하여 에너지절약 투자액이 에너지원단위를 개선시키는 효과가 있는지를 실증분석하였다. 실증분석에 사용된 자료는 패널자료(panel data)로서 제조업 9개 업종 가운데 분석기간 동안 시계열의 안정성이 상대적으로 떨어지는 것으로 판단되는 기타 제조업을 제외한 8개 업종이다. 이 가운데 에너지 다소비업종과 비다소비업종은 각각 4개씩이다. 분석기간은 에너지절약 설비 투자 자료가 이용 가능한 1982~2004년까지이다. 추정결과에 의하면, 첫째로 에너지절약 투자는 에너지원단위를 개선시키는 효과가 있는 것으로 추정되었으나, 에너지절약 절대량 측면에서 그 효과는 그리 크지 않는 것으로 나타났다. 둘째로 에너지절약 자금이 에너지원단위를 개선시키는 데 있어 탄력성 측면에서는 에너지 다소비 업종에 비해 에너지 비다소비 업종에서 더 큰 것으로 추정되었다. 셋째로 에너지절약 관련 투자에 있어 에너지절약 투자 자금도 중요하지만, 자동화 투자도 에너지원단위 개선에 중요한 역할을 하는 것으로 나타났기 때문에 투자의 효율성 개선 측면에서 신중한 접근이 필요하다. 분석에 의하면, 자동화 투자의 에너지원단위 개선효과가 탄력성 측면에서 에너지절약 투자보다 큰 것으로 나타났다. 그러나 투자규모면에서 보면, 에너지절약 투자규모는 자동화 투자 규모에 비해 현격히 낮다. 따라서 탄력성 측면에서는 에너지원단위가 에너지절약 투자액보다 자동화투자에 보다 민감하게 반응하지만, 투자규모를 고려한 단위 투자비에 대한 온실가스 배출 저감효과는 에너지절약 투자액이 보다 큰 것으로 나타났다.

• 설비공학논문집
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• 제30권1호
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• pp.10-16
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• 2018

The climate of summer in Korea is quite hot and humid. Many studies have been carried out to reduce the energy required for operating a dehumidifier. The dehumidifier is mainly connected to the cooling system since it operates in the summer. Conventional dehumidification methods often require additional cooling and energy for dehumidification. In this study, a system for increasing the efficiency by applying a membrane was analyzed. Its energy saving effect was analyzed when it was applied to residential buildings. Economic efficiency was also evaluated. As a result of this study, 9.0% energy savings were achieved for residential buildings. The investment recovery period was 28.9 years. Such long investment recovery period was because the initial investment cost was excessive and annual energy saving only appeared in the summer.

• KIEAE Journal
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• 제13권2호
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• pp.53-60
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• 2013

This study examined the building envelope structure used in small housings near urban area which have not good energy source in relation to the application of passive design for energy saving of small-sized architectural design firms in local cities and aimed to provide the basic materials of future design direction of designers and housing owners by analyzing economy of a project in order to know the amount of energy saving and additional expenses depending on the building envelope pattern. As a result of comparing and examining the energy saving cost from the period of use compared to investment by the thickness of insulating materials based on building envelope pattern for energy saving, it was found that the thicker the insulating materials are, the more energy saving amount is. While the current bead-type insulating materials have short payback period due to low initial investment, extruded insulating materials show the difference of five years compared to bead-type insulation because of its high initial investment.

• 한국지열·수열에너지학회논문집
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• 제13권2호
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• pp.16-21
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• 2017

In this study, the flow effect of warming and cooling in the air supply of a pit for air conditioning were evaluated in BS art museum. We simulated the flow temperature for a pit winter and summer seasons using computational fluid dynamics. Consequential, energy saving, energy saving costs and initial payback periods were calculated and the following conclusions were drawn. The warming effect of the winter increased by $18.1^{\circ}C$ and $0.2^{\circ}C/m$ and the cooling effect of the summer decreased by $6.1^{\circ}C$ and dropped to $0.07^{\circ}C/m$. Energy saving appeared to be 19.1 kW in the summer and 54.3 kW in winter. Energy saving costs ranged from 2,567,119 won/year to 5,134,238 won/year and at minimum, initial payback period for initial investment was 3.9 years. As a result, the air supply system using an existing pit without any burden on initial investment costs is believed to contribute to energy saving through warming and cooling of unutilized energy effects.

• 설비공학논문집
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• 제23권10호
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• pp.656-661
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• 2011

The amount of water resources that can be used tend to be decreased gradually. In contrast, the rapidly increasing water consumption is a problem that need to be addressed. Renovation and equipment replacement to improve energy efficiency and to reduce expenditure for building usage is required. But the excessive initial investment cost and the prolonged of pay back period may be uneconomical choice. Water usage for cleaning the toilet bowl accounts for 27%of the total water usage. Water-saving valve that can select the amount of water for cleaning toilet bowl can be reduced expenditure. After installing water-saving valve, analysed the economic effects. Water-saving valves compared with flush valves, and researched the amount of water usage. Then analyzed for the economic effects. Water-saving valve was used 5.6 ${\ell}$/time for cleaning toilet bowl. In contrast, flush valve was consumed 8.4 ${\ell}$/time. Water-saving valve's water-saving rate was 33.3%. The initial payback period for Water-saving valve was 459.5 days. By a small investment in water saving valve, the economic benefits can be obtained.

• 자원ㆍ환경경제연구
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• 제20권1호
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• pp.99-118
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• 2011

산업부문에서 '저탄소 녹색성장'의 달성 가능성은 기존 화석연료 사용의 의존도를 줄이는 것이 장기적으로 산업 생산성의 향상으로 이어질 수 있느냐에 달려 있다고 볼 수 있다. 본 연구에서는 국내 제조업을 대상으로 에너지절약시설에 대한 투자가 산업 생산성에 미치는 장단기 파급효과를 분석하는 이론적 모형을 제시하고 계량분석기법을 통하여 통계적 유의성 유무를 검증하였다. 에너지절약시설에 투자할 경우 단기적으로는 투자지출이 늘어나 생산비용이 증가하는 '측정효과'와 기술혁신을 위한 신규투자가 지연되는 부(負)의 '실질효과', 장기적으로는 에너지집약도가 개선되어 생산비용이 절감되는 정(正)의 '실질효과' 등이 나타날 수 있다. 산업 생산성의 변화를 설명하는 데 있어서 에너지절약시설 투자규모의 내생성 문제를 해결하기 위하여 2SLS 회귀분석을 실시하였다. 생산액 대비 에너지 투입비용이 상대적으로 높은 제조업 5개 부문을 대상으로 1982년~2006년까지의 연도별 자료를 사용하여 에너지절약시설 투자의 생산성 파급효과 여부를 검증한 결과 화학제품산업을 제외하고 4개 부문에서는 해당 추정계수의 통계적 유의성이 기각되었다. 화학제품산업의 경우 부(負)의 '실질효과'가 정(正)의 '실질효과'를 압도하며 에너지절약시설 투자비용 대비 에너지비용 절감효과는 상대적으로 미미한 것으로 나타났다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.338-341
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• 2011

Water usage for cleaning the toilet bowl accounts for 27% of the total water usage. Water-saving valve that can select the amount of water for cleaning toilet bowl can be reduced expenditure. After installing water-saving valve, analysed the economic effects. Water-saving valves compared with flush valves, and researched the amount of water usage. Then analyzed fort he economic effects. Water-saving valve was used 5.6 ${\ell}/time$ for cleaning toilet bowl. In contrast, flush valve was consumed 8.4 ${\ell}/time$. Water-saving valve's water-saving rate was 33.3%. The initial payback period for Water-saving valve was 459.5 days. By a small investment in water saving valve, the economic benefits can be obtained.

• 한국국방경영분석학회지
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• 제35권2호
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• pp.99-117
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• 2009

에너지는 기업이 생산활동을 하는데 필수불가결한 요소이다. 그렇다면 에너지 가격이 상승할 때 기업의 이윤이 감소하지 않기 위한 조건은 무엇인가? 결론적으로 말해서 에너지 가격 변화율에 따른 생산성 향상 변화율이 총매출액 대비 에너지 비용보다 클 경우 기업은 에너지 가격의 상승으로 인한 충격을 피할 수 있다. 또한 기업이 에너지 비용을 낮춘다는 것은 에너지 효율성을 향상시킨다는 것이다. 이에 본 연구에서는 우리나라 제조업에서 유가의 상승이 에너지절약투자에 미치는 영향과 에너지절약투자가 에너지효율성에 미치는 영향을 분석하였다. 이를 통해서 에너지 가격의 상승에 따른 에너지 효율성의 변화와 그 요인을 함께 분석할 수 있다는 데에 본 연구의 의의를 두고자 한다.

• 교육녹색환경연구
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• 제6권2호
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• pp.25-52
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• 2007

This paper is focused on the economical efficiency of the geothermal heat pump system in school. As the importance of problems of environment and energy becomes larger, the development and distribution of energy-saving technology in the whole nation has become influential. This paper is intended, targeting on school buildings scattered all over the country, to evaluate the introduction and possibility of a terrestrial heat system which is in the first stage of introduction in the country, through energy consumption and efficiency in case where a terrestrial heat system is introduced. To do that, the author performed a qualitative analysis of the heat pump system using various terrestrial heat energy and the system introduced to existing school buildings and, through the analysis, made tentative evaluation on the most environment-friendly and energy saving type system. Also, the author performed simulation analysis using a currently typical school building standard and, on the basis of this result, conducted efficiency analysis of various heat pump systems. The conclusion according to synthetical analysis & evaluation can be summarized as follows. In case a heat pump system is introduced to a school building, it was deemed the investment in the early stage would increase, but the investment could be collected within 5~6 years through reduction of large operation expenses. Also, it was analyzed in case of terrestrial heat contracted heat mode using midnight electric power among heat pump systems, not only early investment but also operation expenses could be reduced to a great extent. Accordingly in case the system using terrestrial heat energy is applied to the school buildings that are to be newly built or repaired in the future, it will provide an object-lesson to students as well as contributing to energy saving.