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황석호 한국건축친환경설비학회 2021 한국건축친환경설비학회 논문집 Vol.15 No.6
Drain Water Heat Recovery (DWHR) or Waste Water Heat Recovery (WWHR) system is a heat recovery from waste drain water flow and preheat the incoming cold water. This system has been shown to be a viable method of improving the building energy efficiency. This paper investigates the energy saving potential for shower water heat recovery system in residential building. Horizontal system of DWHR was considered because it can be installed under a shower booth and easy access to drain and cold water. The heat energy exchange rate is evaluated using the effectiveness-NTU method. Heat transfer effectiveness was calculated by U-value and area of heat exchanger and drain water flow rate. When a flow rate is 7.5 l/min using heat exchanger has 450 W/m2K U-value and 7 m length, it was possible to save about 20% water heating energy.
노후 단독주택에서 쿨루프의 적용을 통한 냉난방 요구량 변화에 대한 해석적 연구
황석호 한국건축친환경설비학회 2022 한국건축친환경설비학회 논문집 Vol.16 No.4
A cool roof has the advantage of reducing the urban heat island effect and building cooling requirement by reflecting solar radiation on the roof surface. Therefore, it is being used as a green remodeling technology for deteriorated buildings. However, to evaluate the performance of the cool roof, it is necessary to evaluation of increases of heating demand due to the decrease of solar heat gain in winter. The ratio of heat gain and loss on the roof surface was analyzed according to the insulation level of old buildings. In particular, buildings with good insulation can reduce heat loss in winter, but may increase cooling requirements in summer. Therefore, reducing the heat gain through the cool roof in summer can be a good alternative. It was confirmed that the heat gain in summer through the roof surface decreased rather than the heat gain in winter, so, the heating and cooling demand was reduced by 27% on the flat roof and 30% or more on the slope roof.
노후 단독주택의 난방에너지 효율 개선을 위한 대안 선정 방법에 관한 연구
황석호 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.2
More than 76% of the detached houses in Korea are over 20 years old. These old detached houses have poor energy efficiency. According to the 2017 Housing Census (Statistics Korea), more than 50% of low-income families live in detached houses. Therefore, the improvement of energy efficiency in old detached houses is needed from the viewpoint of energy welfare. The general method of building energy modelling for the verification of energy efficiency is based on the construction year data of “Building Design Criteria for Energy Saving” due to the cost and time involved in collecting the thermal performance data of buildings. There is poor accuracy with the deterioration of long-term aging of building materials. Also, the selection of alternatives for energy performance improvement is based on the items to be applied, not a performance improvement goal. It is difficult to calculate energy performance that reflects variations in various parameters with dynamic energy simulations. In this study, the influence of long-term aging is used to accurately predict the energy performance of old detached houses. The building energy modelling method is called ENERGY#, which is a static analysis method based on ISO13790. Energy performance is evaluated by a combination of input variables including building orientation, insulation of walls and roof, thermal performance of windows and window/wall ratio, and infiltration rate. Finally, this study provides a way to determine alternatives that meet energy performance improvement goals.