• KIEAE Journal
• /
• 제16권5호
• /
• pp.73-79
• /
• 2016

Purpose: In order to improve the energy performance of existing buildings, so actively promoted green remodeling business. Also, improvement of the performance of envelope system of apartment housing is an absolute. The purpose of implementation of the data base and application plan of the envelope system for green remodeling of apartment housing. Method: For this study, It proposed a classification system of green remodeling envelope system constructed actual to select the applicable representative method and input material of apartment housing for green remodeling. In this study, divided into construction waste processing stage and production phase of the material for the boundary of the system, and implementation the classification system of the envelope system for applicable green remodeling. For this, established 6 environmental impact categories database. Result: As a result of various suggestions were available for case study research, alternative combinations of existing combinations than six kinds of environmental impact insulation system with superior input materials combining 96 kinds, window system, 12 kinds for determining the applicability of the established database. Depending on the account for a large proportion if compared to the detailed analysis of the environmental impact resulting from the production phase and disposal phase was analyzed that the operating management of the necessary input materials. Is considered that the economic performance and integrated energy performance required by the applicable public housing green remodeling evaluation techniques considered for future improvements insulation sheath.

• 한국건설관리학회논문집
• /
• 제13권6호
• /
• pp.3-12
• /
• 2012

최근 민간건축 경기 침체가 거듭되면서 '신축' 시장 대비 비용 절감 효과는 물론, 자원절약 및 환경보호 효과를 거둘 수 있다는 긍정적인 반응과 함께 에너지성능향상형 리모델링 시장의 규모가 확대되고 있다. 서울시의 경우 2008년 시범사업을 시작으로 기존 건물에 대해 '건물에너지이용합리화사업(BRP)'를 추진, 시설개선사업을 통해 에너지 절감 및 이용 효율을 향상시킬 수 있도록 융자지원을 하고 있다. 2012년 보도자료에 따르면 254개소의 민간건축물이 참여, 친환경녹색건축물로 조성됨에 따라 온실가스 4만 1천톤/년을 감축, 석유환산 시 1만4천 TOE의 절감에 해당되어 매년 75억원의 에너지비용 절감효과를 보이고 있다고 한다. 본 연구는 기존 건물의 에너지 효율화 대책으로 리모델링 시 우선적으로 고려해야 할 에너지성능향상 방안 중 건축적 요소인 외피를 연구범위로 설정, 그 방안을 모색하였다. 그리고 해석모델에 적용, 분석함으로써 기존 건물의 에너지 절감효과, 즉 건물의 에너지성능향상 효과를 제시하였다. 연구의 범위가 외피 리모델링만을 고려한 건물의 에너지사용량을 감소시키는 단열보강 등의 목적지향적인 방법일 수 있겠으나, 대부분의 비주거용 업무시설의 경우 임대형이라는 점을 고려하였을 때 건축적 기술만을 적용한 방법의 모색은 실제 리모델링 시 가장 보편적인 기초자료가 될 수 있으므로 연구의 의미가 있다고 할 수 있다.

• KIEAE Journal
• /
• 제12권6호
• /
• pp.85-92
• /
• 2012

The Korean government has introduced building regulations with improved energy conservation measures, including higher insulation levels for building envelope. However, there are many existing buildings that tend to consume more energy for heating and cooling than new buildings, as they were built under the former regulations with relatively higher U-values of walls and glazing. In order to improve energy efficiency in existing buildings, green remodelling of building envelope and building services are required. For existing buildings, building services improvements have been achieved through energy service company(ESCO), but much attention has not been paid to building envelope improvements with various reasons, such as uncertainty of energy saving effect design issues and costs. The aim of this study is to evaluate the impact of building envelope improvements in a typical commercial building on its heating and cooling energy loads. The results show that the improvement of glazing with lower U-values has the highest energy saving effects, followed by wall, roof and floor, under the condition of same level of insulation improvements. However, high insulated glazing increased LCC because of higher initial investment costs.

• 한국건설관리학회논문집
• /
• 제16권3호
• /
• pp.91-100
• /
• 2015

에너지 소비 절감 및 이산화탄소 배출 감소를 위한 노력의 일환으로 대다수의 선진국에서 리모델링 프로젝트를 장려하고 있으며, 이에 따라 건설산업에서 리모델링 사업은 큰 비중으로 성장하고 있다. 기존의 리모델링 관련 연구를 분석한 결과, 1) 리모델링 대안의 생성 및 선정 과정과 2) 건축물 경과년수에 따른 경제적 타당성 분석 결과가 제대로 반영되어 있지 않은 문제점이 있었다. 본 연구에서는 리모델링 대안에 따른 에너지절감량과 경제성을 동시에 고려하여 가장 비용효율적인 에너지절감형 리모델링 대안을 선정할 수 있는 의사결정 지원모델을 개발하였다. 개발된 프로세스 모델은 외피 시스템과 신재생에너지 설비를 조합한 "리모델링 솔루션"을 생성하며, 국제기준(ISO-13790, DIN V 18599)을 응용한 에너지성능평가, 생애주기비용 분석(LCCA)기법을 통한 경제성 평가를 실시하도록 구성되어있으며, 입력된 대안을 순환평가하여 최적의 대안을 출력하도록 구성하였다. 개발된 모델을 실제 사례에 적용한 결과, 비용효율적인 에너지절감형 리모델링 대안을 선정할 수 있는 것으로 확인하였다. 따라서 이 연구를 통해 개발된 모델은 리모델링을 계획하는 의사결정자(예: 발주자) 등에게 효율적인 대안 선정에 도움을 줄 수 있을 것으로 기대된다.

• 한국지열·수열에너지학회논문집
• /
• 제19권4호
• /
• pp.27-38
• /
• 2023

The Government the Republic of Korea is showing a lot of interest in net zero-energy buildings (NZEBs) to reduce energy consumption of buildings and to promote green growth policy in construction sector. The application of building passive technologies and renewable energies is essential to achieving NZEBs. Green remodeling reinforced the insulation of the exterior walls and roofs of the buildings and replaced high-efficiency windows and doors. In this study, the energy performance before and after green remodeling applied in a detached house was comparatively analyzed for baseline scenario and three different ones, ALT 1, ALT 2 and ALT 3. A building modeling and simulation software (DesignBuilder V7.0) with EnergyPlus (V9.4) calculation engine was used to calculate the energy demand and energy consumption for each scenario. Based on the calculation results of the building's energy demand for baseline, it was determined that the target building required more heating energy than cooling energy. The simulation results also showed that the implementation of building envelope performance improvement technologies (ALT 1) could notably decrease the heating energy consumption of the building. After the remodeling (ALT 1), the source energy consumption per unit floor area was assessed to be reduced by 65.2%, compared to prior remodeling of 338.7 kWh/m² -y. Meanwhile, ALT 2 can achieve energy savings of 67.7% and ALT 3 can achieve savings of 73.1%. Following completion of the remodeling project, actual construction costs, and on-site measurements and verification results will be gathered and compared with the simulation results. Additionally, economic analysis including construction costs and payback period will be conducted using actual site data.

• KIEAE Journal
• /
• 제13권3호
• /
• pp.71-78
• /
• 2013

A need for building energy efficiency is on the issue since energy demand in the building stock in Korea represents about 24% of the final energy consumption. As a way of improving the thermal performance of buildings for reducing maintenance costs and environmental conservation, a lot of effort is shown to improve the building energy efficiency by applying improvement of envelope insulation performance for buildings whose energy efficiency is low relatively through the remodeling. The windows of building envelopes are areas that lead to the biggest heat loss in the building. So windows are considered to be the primary target of energy efficiency in remodeling and various studies for windows have been done. Currently, however, only U-factor and airtightness of windows performance are regulated. Window wall ratio(WWR) and solar heat gain coefficient(SHGC) of windows are not considered when conducting the remodeling. In this study appropriate performance of windows(U-factor and SHGC) for existing residential is proposed according to the window wall ratio by using EnergyPlus. As the results of this study, the U-factor of windows representing the maximum energy savings is $1.0W/m^2K$ but in case of SHGC, the values that indicate the maximum energy savings are different depending on the window wall ratio. Therefore, when conducting the remodeling of windows, to determine energy efficiency by considering only the U-factor is inadequate so it is necessary that appropriate windows are applied to buildings by considering window wall ratio and windows properties(U-factor and SHGC).

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2009년도 하계학술발표대회 논문집
• /
• pp.718-723
• /
• 2009

The purpose of this study is to present an in-site evaluation method for building insulation performance using Infra-red camera. The research contents of this study are to evaluate validity and suitability of building insulation defect survey using Infra-red camera for apartment housing with temperature & heat flow pattern analyze method. By establishing the in-site evaluation method building insulation performance using infra-red camera, it is expected that 1) building envelope repair market will be activated by using developed method in ESCO and remodeling companies, 2) the method developed in this research will contribute to reduce national energy consumption by promoting old building insulation remodeling.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2021년도 가을 학술논문 발표대회
• /
• pp.234-235
• /
• 2021

We set the representative balcony types of the existed building to two types: unexpanded balcony and extended balcony, and analyze the effect of reducing the cooling and heating energy load when applying remodeling. The scope of the study was limited to balcony walls, including window-wall junctions, and was conducted by comparing cases with and without thermal break insulation structures for a clear conclusion. The study was conducted using the equivalent U-value in each case. The equivalent U-value was calculated by deriving through 2 dimensional steady-state heat transfer analysis of each case balcony envelope. And building energy was calculated using the derived equivalent U-value. According to the calculation results, for unexpanded balconies, the equivalent U-value was reduced by about 80%, and the heating and cooling load was reduced by about 20%. In the case of extended balconies, the equivalent U-value was reduced by about 57% and the resulting heating and cooling load was reduced by about 12%.

• KIEAE Journal
• /
• 제15권4호
• /
• pp.69-76
• /
• 2015

Purpose: This study is to investigate the effects of facade insulation and window remodeling of an existing old middle school building on the reduction of energy consumption. Method: To analyze energy performance of building, using DesignBuilder v3.4, building energy simulation tool based EnergyPlus engine. Energy consumption and problem of target building was analyzed based on data and survey. Based on building energy simulations it analyzed the variation of energy demand for the building according to U-value of wall, glazing properties and external shading devices. Result: When insulation of building was reinforced, cooling and heating load was decreased. Glazing properties that minimize cooling and heating energy consumption were analyzed. In conclusion, it is important to choose SHGC and U-value of window fit in characteristic of target building. Setting external blind for cooling load decreases 5%.

• 한국생활환경학회지
• /
• 제21권6호
• /
• pp.959-964
• /
• 2014

Energy performance of building envelope components, including external walls, floors, roofs, windows and doors, is crutial for determining how much energy is required for heating and cooling in a building. Among various building technologies, a green roof system can be a good option for reducing heat gain and loss in new buildings as well as existing buildings for green remodeling. This paper evaluates the performance of green roof systems according to soil depth and Leaf Area Index (LAI) for existing buildings. It also attempts to quantify the energy saving effects on new and existing buildings with different insulation levels. Thermal performance of green roofs is mainly dependent on soil thickness and LAI. Installation of green roofs in deteriorated existing buildings can lead to improvements in roof insulation, due to the soil layer. An increase in soil depth leads to a decrease in heating load, regardless of conditions of vegetation on the green roof. Larger LAI values may reduce cooling loads in the cooling season. Installation of green roof in deteriorated existing buildings showed bigger energy saving effect in comparison to a case in new buildings. A simulation study showed that the installation of green roof systems in deteriorated existing buildings with low insulation levels, due to low thermal performance requirements when constructed, could improve the energy performance of the buildings similar or better to the peformance on new buildings with the most updated insulation standard. Thus, when remodeling a deteriorated building, green roofs could be a good option to meet the most recent energy requirements.