The Korean government is planning to cut the greenhouse gas emission from buildings, which accounts for approximately 25% of the total energy consumption, and at approximately 30% from the forecast value by 2020. In November 2013, the heat insulation standard was reinforced for buildings at approxim...
The Korean government is planning to cut the greenhouse gas emission from buildings, which accounts for approximately 25% of the total energy consumption, and at approximately 30% from the forecast value by 2020. In November 2013, the heat insulation standard was reinforced for buildings at approximately 30%. In order to save the building energy, the thermal insulators are recently being produced with a thicker exterior cover, while the available building area is reduced, thereby resulting in the increase in construction costs. In order to address such problems, the development of highly efficient insulation materials is being focused on. The high-efficiency insulators are thin, but have good insulation performance. They include vacuum insulators, aerogel insulators, and reflection insulators. The most favorable high-efficiency insulator is the heat reflection insulator, which is used for small-scale buildings in the market. The heat reflection insulator showed better insulation performance than the resistance insulators, albeit with the same thickness, in many studies. In addition, the heat reflection insulator is compact and easily installed. Accordingly, it is increasingly used as the exterior thermal insulator. However, the shape of the heat reflection insulator is not kept uniform, i.e. in the laboratory or in the field, and the insulation performance varies according to the installation method. Nevertheless, there have been a few accurate study data on such issues. Furthermore, energy is often wasted in the field because of the lack of accurate understanding about the heat reflection insulator, thereby resulting in an incorrect installation. In this study, an aluminum thin film and a paper honeycomb were used in a panel form in order to develop a heat reflection insulator, which maintained a certain shape even under an external pressure. Based on the test results, the following conclusions were made : 1. The overall insulation performance was measured during the test period, and the heat reflection insulator with the Styrofoam and honeycomb had the best performance. When the external temperature was low and the temperature inside the specimen was high, the insulation performance was at the highest in the heat reflection insulator with the Styrofoam, and at the lowest in the existing one with the aluminum. When the external temperature was high, however, the aluminum heat reflection insulator with the honeycomb had the highest insulation performance among the specimens with the same thickness. 2. When the paper honeycomb was punctured and tested with diverse specimen shapes, the thermal transmittance was at the lowest in the single-layer 20-mm honeycomb, followed by the single-layer punctured 20-mm honeycomb, single-layer 40-mm honeycomb, double-layer 20-mm honeycomb, single-layer 40-mm honeycomb, and double-layer punctured 20-mm honeycomb, respectively. Accordingly, when the paper honeycomb was used to make an aluminum panel, the punctured honeycomb had a better insulation performance than the non-punctured honeycomb because it had a lower thermal transmittance. When the honeycomb was used to make an aluminum panel, a single-layer punctured honeycomb layer was better than a double-layer honeycomb in terms of the thermal insulation performance. 3. In the heat reflection insulator specimen with an aluminum thin film based on the paper honeycomb, the thermal transmittance was higher when the honeycomb was punctured so that air could pass through. This indicates that the insulation performance was improved by the heat reflection effect of the thin aluminum film rather than the insulation effect of the air layer between the honeycombs. 4. In order to improve the insulation performance of the heat reflection insulators in the market, the aforementioned characteristics should be considered to develop products with better insulation performance. When the reflected heat was emitted to the outside by puncturing the honeycomb, however, it had no insulation effect because either the thermal insulation effect of the air in the space in the honeycomb was better than the effect of emitting the reflected heat, or the heat was not emitted to the outside through the honeycomb cell holes due to the test specimen characteristic. In this study, the paper honeycomb was used as the heat reflection insulator in order to improve the performance of the existing thermal insulators. In addition, the feasibility of the study results in the field was verified through the multi-dimensional comparative analysis. In the construction field, the appropriate methods for the insulation materials were not used, and the characteristics of the heat reflection insulator were not considered. Accordingly, the thermal insulation performance was not uniform throughout the year (summer and winter), for example. Therefore, diverse measures should be taken, including the development of field construction manuals, precautionary measures on installation position, exterior/interior insulation selection standard, and further studies are required not only on the insulation materials, but also on the relevant policies.
The Korean government is planning to cut the greenhouse gas emission from buildings, which accounts for approximately 25% of the total energy consumption, and at approximately 30% from the forecast value by 2020. In November 2013, the heat insulation standard was reinforced for buildings at approximately 30%. In order to save the building energy, the thermal insulators are recently being produced with a thicker exterior cover, while the available building area is reduced, thereby resulting in the increase in construction costs. In order to address such problems, the development of highly efficient insulation materials is being focused on. The high-efficiency insulators are thin, but have good insulation performance. They include vacuum insulators, aerogel insulators, and reflection insulators. The most favorable high-efficiency insulator is the heat reflection insulator, which is used for small-scale buildings in the market. The heat reflection insulator showed better insulation performance than the resistance insulators, albeit with the same thickness, in many studies. In addition, the heat reflection insulator is compact and easily installed. Accordingly, it is increasingly used as the exterior thermal insulator. However, the shape of the heat reflection insulator is not kept uniform, i.e. in the laboratory or in the field, and the insulation performance varies according to the installation method. Nevertheless, there have been a few accurate study data on such issues. Furthermore, energy is often wasted in the field because of the lack of accurate understanding about the heat reflection insulator, thereby resulting in an incorrect installation. In this study, an aluminum thin film and a paper honeycomb were used in a panel form in order to develop a heat reflection insulator, which maintained a certain shape even under an external pressure. Based on the test results, the following conclusions were made : 1. The overall insulation performance was measured during the test period, and the heat reflection insulator with the Styrofoam and honeycomb had the best performance. When the external temperature was low and the temperature inside the specimen was high, the insulation performance was at the highest in the heat reflection insulator with the Styrofoam, and at the lowest in the existing one with the aluminum. When the external temperature was high, however, the aluminum heat reflection insulator with the honeycomb had the highest insulation performance among the specimens with the same thickness. 2. When the paper honeycomb was punctured and tested with diverse specimen shapes, the thermal transmittance was at the lowest in the single-layer 20-mm honeycomb, followed by the single-layer punctured 20-mm honeycomb, single-layer 40-mm honeycomb, double-layer 20-mm honeycomb, single-layer 40-mm honeycomb, and double-layer punctured 20-mm honeycomb, respectively. Accordingly, when the paper honeycomb was used to make an aluminum panel, the punctured honeycomb had a better insulation performance than the non-punctured honeycomb because it had a lower thermal transmittance. When the honeycomb was used to make an aluminum panel, a single-layer punctured honeycomb layer was better than a double-layer honeycomb in terms of the thermal insulation performance. 3. In the heat reflection insulator specimen with an aluminum thin film based on the paper honeycomb, the thermal transmittance was higher when the honeycomb was punctured so that air could pass through. This indicates that the insulation performance was improved by the heat reflection effect of the thin aluminum film rather than the insulation effect of the air layer between the honeycombs. 4. In order to improve the insulation performance of the heat reflection insulators in the market, the aforementioned characteristics should be considered to develop products with better insulation performance. When the reflected heat was emitted to the outside by puncturing the honeycomb, however, it had no insulation effect because either the thermal insulation effect of the air in the space in the honeycomb was better than the effect of emitting the reflected heat, or the heat was not emitted to the outside through the honeycomb cell holes due to the test specimen characteristic. In this study, the paper honeycomb was used as the heat reflection insulator in order to improve the performance of the existing thermal insulators. In addition, the feasibility of the study results in the field was verified through the multi-dimensional comparative analysis. In the construction field, the appropriate methods for the insulation materials were not used, and the characteristics of the heat reflection insulator were not considered. Accordingly, the thermal insulation performance was not uniform throughout the year (summer and winter), for example. Therefore, diverse measures should be taken, including the development of field construction manuals, precautionary measures on installation position, exterior/interior insulation selection standard, and further studies are required not only on the insulation materials, but also on the relevant policies.
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