패시브주택과 일반주택의 난방운전특성 비교 분석

김용기,김원욱,이태원 한국퍼실리티매니지먼트학회 2018 한국퍼실리티매니지먼트학회지 Vol.13 No.2

Domestic residential buildings mainly use radiant floor heating. The government is continuously reinforcing the insulation standards, so it is necessary to review the operating conditions and design data of the floor heating system in high insulation conditions. Therefore, in this study, the characteristics of daily heating operation are analyzed for passive design households, and the daily heating energy consumption is compared with the characteristics in existing insulation conditions. As a result of examining the heating operation characteristics for passive houses, it was reasonable to maintain the room temperature even if the heating supply water temperature in the high insulation housing is lowered to 40~50℃. In addition, the passive apartment houses of this study showed that heating energy consumption decreased to about 50% compared with the insulation conditions in 2006. In passive apartment houses, heat loss to the upper and lower floors becomes relatively important as the heat loss through the enclosure decreases. To prevent this, it is necessary to strengthen the insulation against the bottom layer.

An Experimental Verification Study on the Heat Flow Analysis Results of a Tube Furnace

Byungsuk Park,Sangwoon Kwon,Juho Lee,Changhwa Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2

In general, systems are developed by repeatedly performing the processes of design, analysis, manufacturing, and performance testing. In particular, systems with temperature, pressure, and flow rate often utilize computational fluid dynamics tools at the design stage. In this paper, we aim to verify the reliability of the analysis results of Solidworks Flow Simulation, which is widely used in heat flow analysis at the design stage. A tube furnace was manufactured, various experiments were performed, and a study was conducted to compare the analysis results. The details of the experiment are as follows. First, an experiment was conducted in which the heater was heated to 900°C without insulating the exposed part of the tube. The detailed contents of the experiment are as follows; - Heating heater and measuring temperature without supplying flow inside the tube, - Tube flow supply (25°C, 15 lpm air) and heater heating/temperature measurement. Second, an experiment was performed in which the exposed part of the tube was insulated (thickness 50 mm) and the heater was heated to 900°C. The detailed contents of the experiment are as follows; - Insulate the outside of the tube except for the flanges at both ends of the tube, and heat the heater and measure the temperature without supplying flow inside the tube. - Insulate the outside of the tube except for the flanges at both ends of the tube, supply flow rate inside the tube (25°C, 15 lpm air) and measure heater heating/temperature. - Insulate the flange of the flow supply section, heat the heater and measure temperature without supplying flow inside the tube. - Insulate the flange of the flow supply section, heat the supply air (277°C, 15 lpm) and measure the temperature using a heating gun without heating the heater. - Insulate the flange of the flow supply section, supply heated air (277°C, 15 lpm) and measure heater heating/temperature. - Insulate the flange of the flow supply section and measure temperature according to heater heating (900°C) and supply temperature (25°C, 277°C 15 lpm). The following results were derived from the experimental and analysis results. - When the exposed part of the tube is insulated, the temperature inside the tube increases and the steady-state power decreases compared to non-insulated. - In areas with insulation, the temperature error between experiment and analysis results is not large. - When flow rate is supplied, there is a large temperature error in experiment and analysis results. - The temperature change after the center of the heater is not large for a temperature change of 15 lpm flow rate. From these results, it can be seen that Solidworks Flow Simulation has a significant difference from the experimental results when there is a flow rate in the tube. This was thought to be because the flow rate acts as a disturbance, and this cannot be sufficiently accounted for in the analysis. In the future, we plan to check whether there is a way to solve this problem.

원전용 금속단열재의 내부 형상결정을 위한 설계인자 별 열전달 특성 분석

송기오(Ki O Song),유정호(Jeong Ho Yu),이태호(Tae Ho Lee),전현익(Hyun Ik Jeon),하승우(Seung Woo Ha),조선영(Sun Young Cho) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.11

일반적으로 산업현장에서 많이 사용되고 있는 단열재는 유리섬유와 같은 열전도도가 낮은 재료를 사용함으로써 단열성능을 확보하고 있다. 이와 달리 원전용 금속단열재의 경우 높은 열전도도를 가진 TP 304 스테인리스 박판을 재료로 한정하고 있어 단열성능을 확보하기 위해서는 구조적 측면에서의 접근이 필요하다. 본 연구에서는 금속단열재 내부구조에 대한 설계인자를 전도, 대류, 복사로 구성된 3가지 열전달 모드를 고려해 추출하고 각 인자들이 열전달에 미치는 영향과 각각의 열전달이 전체 열전달에 차지하는 비율을 열 유동해석을 이용하여 파악하고자 하였다. 본 연구를 통해 단열재 내부에서 발생되는 대류현상을 최소화하기 위해 다수의 박판을 삽입함과 동시에 증가하는 전도 비율을 비교하여 내부형상결정을 위한 세 가지 열전달 모드 하에서의 단열성능을 분석하였다. A heat insulating material used in the industrial site normally derives its heat insulating performance by using a low thermal conductivity material such as glass fiber. In case of the metal insulation for nuclear power plant, in contrast, only TP 304 stainless steel foil having high thermal conductivity is the only acceptable material. So, it is required to approach in structural aspect to ensure the insulation performance. In this study, the design factors related to the metal insulation internal structure were determined considering the three modes of heat transfer, i.e., conduction, convection, and radiation. The analysis of heat flow was used to understand the ratio of the heat transfer from each factor to the overall heat transfer from all the factors. Based on this study, in order to minimize the convection phenomenon caused by the internal insulation, a multiple foil was inserted in the insulation. The increase in the conduction heat transfer rate was compared, and the insulation performance under the three modes of heat transfer was analyzed in order to determine the internal geometry.

공동주택 결로 방지 보조 단열재의 난방 에너지 저감 성능 분석

신미수,이규남 한국건축친환경설비학회 2021 한국건축친환경설비학회 논문집 Vol.15 No.1

In apartment buildings, supplementary insulation is usually applied to the indoor side of wall-wall or wall-slab junctions to prevent condensation at thermal bridges. Although it is well known that the supplementary insulation is effective for the condensation prevention, few studies were conducted to investigate the impact of the supplementary insulation on the heating energy. In the present study, THERM and TRNSYS simulations were performed to analyze the impact of the width of supplementary insulation and the thickness of exterior wall insulation on heating energy as well as condensation prevention. Simulation results showed that the supplementary insulation of 300 mm-width is enough for the condensation prevention. It was found that the supplementary insulation can reduce the heating energy demand by 4.1%, 4.3%, and 5.5% for Central 1, Central 2, and Southern region, respectively. The width of supplementary insulation needs to be determined to achieve the sufficient energy saving while avoiding excessive addition of the supplementary insulation.

광발열 단열시트를 적용한콘크리트의 특성

이현직 ( Lee Hyeon-jik ),백성진 ( Baek Sung-jin ),이승민 ( Lee Seung-min ),임군수 ( Lim Gun-su ),김종 ( Kim Jong ),한민철 ( Han Min-cheol ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1

In this study, light-heat generating materials were produced in two ways, and the performance of two light-generating insulation sheets was reviewed. As a result of the experiment, it was possible to confirm the improved heating performance of the light heating insulation sheet compared to the existing bubble sheet. The light heat insulation sheet (b) showed improved thermal properties compared to the existing bubble sheet, and it is believed that the temperature has increased due to the combined effect of initial hydration heat and heat generation after installation. In future studies additional experiments are needed to compensate for the insufficient insulation performance due to the single bubble sheet through the double bubble sheet and to adjust the amount of light-generating materials added as a consideration of the optimal heat-generating effect of the light-generating insulation sheet (b).

패시브 디자인이 적용된 공동주택의 단위세대 난방운전특성 분석

김용기(Yongki Kim),김원욱(Wonuk Kim),이태원(Taewon Lee) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6

Domestic residential buildings mainly use radiant floor heating. The government is continuously reinforcing the insulation standards, so it is necessary to review the operating conditions and design data of the floor heating system in high insulation conditions. Therefore, in this study, the characteristics of daily heating operation are analyzed for passive design households, and the daily heating energy consumption is compared with the characteristics in existing insulation conditions. As a result of examining the heating operation characteristics for passive houses, it was reasonable to maintain the room temperature even if the heating supply water temperature in the high insulation housing is lowered to 40 ~ 50℃. In addition, the passive apartment houses of this study showed that heating energy consumption decreased to about 50% compared with the insulation conditions in 2006. In passive apartment houses, it is necessary to strengthen the insulation of the floor to prevent heat loss to the upper and lower floors.

철도전기실의 초박형 액체단열재 적용을 통한 에너지 절감효과

김형철(Hyungchul Kim),장정훈(Junghoon Jang),신승권(Sungkwon Shin),박용섭(Yongsub Park),김상암(Sangam Kim),김형래(Hyeong Rae kim),현병수(Byungsoo Hyun),김진호(Jinho Kim) 대한전기학회 2015 전기학회논문지 Vol.64 No.1

In this paper, because of global environmental problems such as energy shortage and abnormal climate, green energy development and energy saving technology development is being magnified. Heat insulation, the most basic and traditional energy saving method, is highly expected. Especially, simple and advanced heat insulation technique based on Nano material is promising future technology. The railway system also requires heat insulation. Especially, traditional heat insulator such as glass wool has been adopted frequently to rolling stock. The heat insulator is also adopted in general railway service buildings. Take account of cost-effective heat blocking performance, the heat insulator shall be adopted in diverse fields such as electric power, railroad, signal and communication. The only and direct solution for this problem is installing heat insulator with outstanding endurance, corrosion resistance and heat resistance to block outer heat Upgrading heat specification of equipment can be a solution, but since price and maintenance cost rise severely, this plan might be incongruous. In this research, energy saving effect of ultrathin heat insulator film was demonstrated by installing the film on roof of electrical room.

Energy Efficiency Analysis of Internally and Externally Insulated Apartment Buildings

Song, Seung-Yeong,Yeo, Myoung-Souk,Koo, Bo-Kyoung,Lee, Soo-Jin Architectural Institute of Japan 2011 JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEE Vol.10 No.2

<P>Apartment buildings are the most common type of residential buildings in Korea, where hot water heating pipes are installed in the floor structures. An internal insulation system (IIS) has been applied to the outside walls of most Korean apartment buildings, so there are many cases in which the layer of insulation is disconnected by structural components at the wall-slab joints. These joints become thermal bridges where heat transfer increases. An external insulation and finish system (EIFS) is a possible solution to this problem. In this study, the surface temperature distributions of actual apartment buildings with an IIS and an EIFS were investigated with an infrared thermal imaging camera. Annual heat losses and gains through the wall-slab joints with an IIS and an EIFS were calculated by three-dimensional transient heat transfer simulations in which hot water heating was excluded and included, respectively, in order to evaluate not only the heating and cooling loads, but also the heating efficiency when the building is actually heated. The results show that the amount of heat transfer through the wall-slab joints with an IIS is considerable, even though additional insulation is installed under the slab, and the EIFS significantly reduces the heating and cooling loads and improves the heating efficiency.</P>

열 차단 필름의 적용에 따른 냉난방 부하 분석에 관한 연구

김석현(Kim Seok-Hyun),조영흠(ChoYoung-Hum) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.6

In order to reduce the energy consumption of the building, much effort is being made. The problems are that excessive solar radiation in summer and the heat loss in winter by the increase of window area. To prevent this problems, government limited the window area ratio or the performance of windows in new buildings. In order to reduce energy consumption of the existing buildings, the window film insulation is spotlight because the window film insulation was simple to installation. This study confirmed the performance of the window film insulation and affect to heating & cooling load of buildings. The impact of the window film insulation coating was confirmed by experiment. And this study confirmed the annual heating & cooling load by simulation. As a results, the surface temperature of coated window was higher than the surface temperature of existing window. The window film insulation was increased surface temperature of window. And this study confirmed that the increased surface temperature was slightly affected the room air temperature through experiment of the insulation box. The results of the heating and cooling load by simulation, this study confirmed that the case of coated window film insulation decreased cooling load in summer and increased heating load in winter. Also the annual total heating & cooling load was increased a little in the case of coated the window film insulation.

발열시트 및 단열재를 사용한 거푸집 내부 콘크리트의 저온환경하 온도이력 특성에 관한 실험적 연구

최시현,이한승,최현국 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.4

본 연구에서는 저온환경에서 콘크리트 동해를 방지하기 위해 생석회의 화학반응을 활용한 발열시트 및 단열재를 사용하여 제작한 거푸집 특성을 실험을 통해 평가하였다. -10°C 정온조건에서 거푸집 실험 결과, 발열시트가 부착된 거푸집의 경우 발열시트 내부 생석회의 발 열로 인해 타설 초기에 일반거푸집에 비해 10°C이상 높은 온도이력을 보여주었고 단열재를 부착한 거푸집의 경우 콘크리트 수화열을 보존하 여 지속적으로 높은 온도를 유지하는 특징을 나타냈다. 아이소핑크와 발열시트를 부착한 거푸집과 진공단열재를 붙인 거푸집이 압축강도나 적산온도에서 가장 높은 값을 가졌다. 압축강도 측정시 진공단열재 및 아이소핑크와 발열시트를 부착한 거푸집이 재령 3일에서 약 5 MPa로 가 장 높게 측정되었다. 몽골 현지 외기온도에서도 실험을 하였는데 앞선 결과와 마찬가지로 발열시트, 단열재를 함께 붙인 거푸집이 48시간 동안 25°C 이상으로 가장 높은 온도이력를 나타내었다. 따라서 거푸집에 발열시트 및 단열재 부착을 함으로써 발열 및 단열효과로 인해 저온환경에 서 콘크리트 강도발현에 도움을 주는 것을 확인할 수 있었다. In this study, in order to prevent the frost damage of the concrete, the characteristics of the form using heating sheet utilizing the chemical reaction of quicklime and the insulation were evaluated through experiments at low temperature. In the case of form at –10°C, the form with attached heating sheet showed a temperature history of more than 10°C higher than that of wood form at the early of concreting due to heat of the quicklime in the heating sheet. In the case of the insulated form, the concrete was kept at a high temperature by preserving the hydration heat. When the heating sheet and the isopink(extruded polystyrene) were attached together on the form, the effect was the same as that of the vacuum insulation. The compressive strength of the form with vacuum insulation and form with isopink, heating sheet as measured about 5 MPa at age 3. The experimental in Mongolia, as with the pervious results, the form with the heating sheet and the insulation showed the highest temperature history over 25°C for 48 hours. Therefore, it was confirmed that the heating sheet and insulation are attached to the form, which helps the concrete strength development at low temperature by heat generation and the insulation effect.