• Title, Summary, Keyword: Thermal Insulation Performance

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Condensation Prevention Performance Assessment Taking Into Account Thermal Insulation Performance Degradation Due to Aging for Apartment Housing

  • Choi, Doo-Sung;Lee, Myung-Eun
    • KIEAE Journal
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    • v.15 no.6
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    • pp.11-18
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    • 2015
  • Purpose: The current study analyzed trends in thermal insulation performance with aging, and condensation characteristics caused by the former. Method: Thermal insulation and condensation prevention performance of an architecture were assessed using Temperature Difference Ration Inside, or TDRi. Subjects of this quantitative analysis in thermal insulation performance change due to aging included recently constructed apartments and aged apartments older than 40 years. Time series comparison and analysis were conducted to observed changes in the thermal insulation performance and condensation characteristics. Result: Analysis showed that wall insulation performance degraded with aging regardless of fortified insulating material usage or insulating material type, which caused increased danger of condensation. In addition, when fortified insulating material was installed on the connection between the walls, insulation performance degradation was lower compared to cases in which fortified materials were not used. In all cases from 1 to 10, the rate of thermal insulation performance degradation increased after 20 years of aging.

Energy Consumption Characteristics and Evaluation of Thermal Insulation Performance in Accordance with Built Year of Apartment Complex (공동주택의 준공연도에 따른 단열성능 평가 및 에너지소비 특성에 관한 연구)

  • Choi, Doo Sung;Lee, Myung Eun;Chun, Hung Chan
    • KIEAE Journal
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    • v.14 no.3
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    • pp.79-86
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    • 2014
  • Studies have shown that the thermal performance of buildings changes depending on the year of construction completion. It leads to increased energy consumption of buildings and significant financial burden on users. Thus, this study has calculated the thermal insulation performance of 86 apartments quantitatively, using temperature difference ratio and sensible heat flux. Also, energy consumption characteristics depending on the year of construction completion and thermal insulation performance were analyzed by comparatively analyzing the results of insulation performance evaluation and heating costs. The analysis results are as follows. As for thermal insulation performance, it was around 70% lower in the apartments completed before 1985, compared to apartments completed after 2010. As for heating costs, the apartments with the highest heating cost incurred 1.5 higher heating cost than the apartment with the lowest heating cost. In terms of the insulation performance evaluation, the difference was 2.5-fold.

Calculation of Adequate Remodeling Period for The Improvement of Thermal Insulation Performance of External Walls in Deteriorated Apartments

  • Choi, Doo-Sung;Lee, Myung-Eun
    • KIEAE Journal
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    • v.17 no.2
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    • pp.5-12
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    • 2017
  • Purpose: Under the purpose of presenting the adequate remodeling period for the improvement of thermal insulation performance of external walls in deteriorated buildings, the change in external wall and residential environment problem(dew condensation) due to aged deterioration after the apartments were constructed in Korea were analyzed. Method: Temperature Difference Ratio Outside(TDRo) and Heat Flow Meter(HFM) were used as measurement methods to evaluate the thermal insulation performance of deteriorated buildings. For TDR evaluation, thermo-graphic camera was used to measure and analyze the surface temperature of external wall. Also, dew condensation evaluation was analyzed using the Temperature Difference Ratio Inside(TDRi). Result: As a result of analyzing thermal performance through TDRo, the first decline point of thermal insulation performance began after 14-16 years have passed since construction was completed, and after 20 years have passed the decline point of thermal insulation performance reappeared. As a result of analyzing U-value with HFM measurement method, the decline rate of external wall's thermal insulation performance is lower than 2% in average at around 5 years after completion, and 8.7% in average at 10-15 years, and over 10.2% in average at 20 years.

Prediction of Wall Insulation Performance by Design Parameters of Low Emissivity Thin-film Composite Insulation (저방사 박막 복합 단열재 설계인자에 따른 벽체 단열성능 예측에 관한 연구)

  • Seo, Jun-Sik;Hong, Seung-Hun;No, Sang-Tae
    • 한국건축친환경설비학회 논문집
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    • v.12 no.5
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    • pp.433-448
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    • 2018
  • This increase in input per unit area due to the strengthening of energy design standards appears to accelerate the growth of insulation market. Therefore, in Korea, the construction of low radiation thin film composite insulation has been increasing in order to improve the thermal resistance of the air cavity and to reduce the thickness of the insulation. As building energy-saving designs become more popular in Korea (notification of Ministry of Land, Infrastructure and Transport), test reports of insulation tests on windows and walls must be approved for new construction. However, it is difficult to measure the thermal insulation performance of low-emissivity insulation only, and the insulation performance of low-emissivity insulation only is not satisfied because it does not satisfy the indices required for thermal insulation performance such as the energy performance index of the energy saving plan. Therefore, in order to derive reference data of low emissivity insulation, this study analyzed and measured the change of insulation performance according to the design factor of low emissivity insulation wall through numerical analysis and model test.

The Thermal Performance of Building Insulation Materials According to Long-Term Aging (건축용 단열재의 장기 경시변화에 따른 열성능 특성)

  • Choi, Bo-Hye;Kang, Jae-Sik
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.11
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    • pp.617-623
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    • 2013
  • This study is to draw thermal property data during long-term aging, by testing the thermal conductivity of building insulation materials in Korea. The thermal resistance of extruded insulation within 3 days from manufacture performed well over the KS Standard. After 50 to 110 days, however, the thermal performance had deteriorated to the level of the KS standard. Eventually, after 4,000 days, the insulation performance had deteriorated to about 25.4~41.8% of the initial performance. Therefore, this research will be utilized as a reference for thermal properties during long-term aging, in order to improve standards and regulations related to building insulation materials.

Thermal Insulation Performance of Composite Waterproofing Method of Thermal Supplement Type (단열 보완형 복합방수공법의 단열성능에 관한 연구)

  • Choi, Sung-Min
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.18 no.4
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    • pp.59-66
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    • 2014
  • Insulation of rooftop is one of the major performance to energy-saving construction. Further, waterproofing performance is also important. For such a reason, it is need to develop waterproofing method containing thermal insulation property. This study was wanted to evaluate thermal insulation performance about the composite waterproofing method of thermal supplement type that is developed recently. As a result of waterproofing performance test, every test item was showed over the performance standards of KS (Korean (Industrial) Standards). And the result of thermal insulation performance test, the highest temperature in the styrofoam box was $25.91^{\circ}C$, the bubble sheet box was $17.28^{\circ}C$, the insulation sheet box was $15.47^{\circ}C$ and the waterproofing sheet box of thermal supplement type was $24.11^{\circ}C$. In observations of thermal bridges of sheet's joint, thermal bridges was not identified at the sheet's joint. As a result, composite waterproofing method of thermal supplement type is interpreted to have thermal insulation performance.

Studies on Insulation Effect Related with Thin-Plate Design Factors for Reflective Metal Insulation(RMI) of Nuclear Power Plant (금속단열재 박판의 설계인자별 단열성능 영향 연구)

  • Eo, Minhun;Lee, Sungmyung;Jang, Kyehwan
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.28 no.9
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    • pp.350-354
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    • 2016
  • Although fibrous insulations are generally used with resistive insulation type, metallic insulation is proper matter to satisfy low head-loss and equipment life when considering the specific condition, especially for Nuclear power plant. Common insulation is resistance insulation with a low thermal conductivity. but RMI is made of sheet plate with low emissivity and closed air space. Thermal radiation is blocked by stainless steel with low emissivity. Thermal conductivity and thermal convection are blocked by closed air space. This study shows the changes and effects of the heat loss according to shape and method of stacking sheet plates inserted into the insulation and analyzed the most optimized way for thermal insulation performance. The result shows that using sheet plate structure through raised and protruding shape processing was the appropriate model to optimize thermal performance. Additionally, insulating performance of RMI improved by placing the sheet plate in a high temperature region intensively.

Behavior of Thermal Insulation Ratio and clo due to Changes in Weight and Thickness of High Thermal Insulation Padding (고보온성 패딩의 중량과 두께 변화에 따른 보온율과 clo의 거동)

  • Lee, Jeong Mun;Kim, Byung Soon;Chun, Sang Hee;Kim, Seong Wook;Cho, Gil Soo
    • Textile Science and Engineering
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    • v.53 no.3
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    • pp.205-212
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    • 2016
  • In the previous study of constant packing density when padding low thermal insulation, heat resistance and thermal insulation ratio (%) was determined to increase proportionally with the thickness. This study investigates the change in the thermal insulation ratio and clo with increase in weight and thickness of the padding, which has high thermal insulation performance, and the result is as follows. When the weight or thickness of the padding is small, the initial thermal insulation ratio (%) increases proportionally with the weight or thickness. Unlike in previous studies, in this study, the growth rate of thermal insulation ratio decreases from a certain point, and the proportional relationship does not appear. Thereafter, the growth rate of thermal insulation ratio is convergent near zero. Moreover, thermal insulation ratios do not increase even though the weight or thickness increases. If the padding has high thermal insulation performance, the clo increases proportionally with the weight or thickness of the padding. Furthermore, with the aforementioned behavioral characteristics of high thermal insulation padding, high insulation products can be used to improve vitality and survival rate of the wearer because high insulation padding with less weight and thickness than low insulation padding can achieve the same thermal insulation ratio.

Evaluation of Building Envelope Performance of a Dry Exterior Insulation System Using Truss Insulation Frame (트러스 단열 프레임을 이용한 건식 외단열 시스템의 외피 종합 성능 평가)

  • Song, Jin-Hee;Lee, Dong-Yun;Shin, Dong-Il;Jun, Hyun-Do;Park, Cheol-Yong;Kim, Sang-Kyun
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.35 no.6
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    • pp.153-164
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    • 2019
  • The presence of thermal bridges in a building envelope cause additional heat loss which increases the heating energy. Given that a higher building insulation performance is required in these cases, the heat loss via thermal bridges is a high proportion of the total heat energy consumption of a building. For the dry exterior insulation system that uses mullions and transoms to fix insulation and exterior materials such as stone and metal sheet, the occurrence of thermal bridges at mullions and transoms is one of the main reasons for heat loss. In this study, a dry exterior insulation system using the truss insulation frame (TIF) was proposed as an alternative to metal mullions. To evaluate the building envelope performance, structural, air-leakage, water-leakage, fire-resistance, thermal, and condensation risk tests were conducted. In addition, the annual energy consumption associated with heating and cooling was calculated, including the linear thermal transmittance of the thermal bridges. As a result, the dry exterior insulation system using TIF achieved the allowable value for all tests. It was also determined that the annual heating load of a building was reduced by 36.7 % when the TIF dry exterior insulation system was used, relative to the dry exterior insulation system using steel pipes without additional insulations.

Thermal Performance of Building Envelope with Transparent Insulation Wall (건물 외피 투과형단열 벽체의 열성능 해석 연구)

  • Jang, Yong-Sung;Yoon, Yong-Jin;Park, Hyo-Soon
    • KIEAE Journal
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    • v.5 no.1
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    • pp.27-33
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    • 2005
  • Global efforts have made to reduce energy consumption and $CO_2$ gas emission. One of the weakest parts for energy loss through the whole building components is building envelopes. Lots of technologies to increase the thermal performance of building envelopes have been introduced in recent year. Transparent Insulation Wall(TIW) is a new technology for building insulation and has been function both solar transmittance and thermal insulation. A mathematical model of a Transparent Insulation Wall equipped with south wall was proposed in order to predict thermal performance under varying climates(summer and winter). Unsteady state heat transfer equations were set up using an energy balance equation and solved using Gauss-Seidel iteration solution procedure. The thermal performance of the TIW determined from a wall surface and air layer temperature, non-airconditioned room temperature and air conditioning load. As a result, this numerical study shows that the TIW is effective in an air conditioning load reduction. Further experimental study is required to establish complete TIW system.