In the area of architecture, there are a number of studies on energy saving and of the cases where various systems are in effect applied to building. The components of building include wall and roof. While in the case of wall, the use of various ornaments and insulation would lead to energy saving, ...
In the area of architecture, there are a number of studies on energy saving and of the cases where various systems are in effect applied to building. The components of building include wall and roof. While in the case of wall, the use of various ornaments and insulation would lead to energy saving, in the case of roof, even the roof with insulation could directly receive strong sunlight resulting in the occurrence of a lot of cooling load at its top. Rooftop greening is regarded as a way to settle this issue, namely to lessen load at its top, while forming Bio Top simultaneously. But in practice, it is difficult to implement rooftop greening in small house has due mainly to the cost. Shedding light upon roof, in particular rooftop, amongst the components of a building, this study considers the way to lessen cooling load and to deal with interior heated environment at the top of a building. Miniature experiment has been conducted to examine the interior thermal environment at the top level that can vary according to each material forming a building; for this, materials forming the roof, which can affect the sunlight block effect the rooftop is to have, have been selected. The study intends to present itself as a basic data on the interior thermal environment at the top level which will be needed in building design. In order to identify to what degree the thickness of rubber mat and of rooftop greening, which performs the thermal buffer function at the rooftop, can affect the surface of interior ceiling and interior temperature, miniature was created, and that degree was estimated at 10 minutes intervals. The result of this experiment shows that the surface of rooftop level on which sunlight has direct effect may affect the rise of interior temperature to a great degree. This result can be summarized as follows.
1. It has turned out that it is significantly advantageous to cover rooftop level with the material that can play the role of thermal buffer between air and the surface of rooftop in lessening interior cooling load of the miniature.
2. It has been observed that in the case of rooftop greening consisting of soil and lawn, rather than rubber mat, interior temperature is lower than exterior temperature
3. When setting up rubber mat, it is necessary to diminish the flow of air as much as possible by making it fully attached to the surface, and when attaching a rubber mat to another rubber mat, it should be done in a way that reduces the flow of air.
4. To compare rubber mat to rooftop greening, as to the identical 100㎜ thickness, (+) and (-) value are displayed at the same time, and as to over 200㎜ thickness, all displays (-) value. Also, when comparing 200㎜ thickness with 300㎜ thickness, the cooling load of the former turns out to be reduced by around 2.4 times. Thus, it can be said that in the case where construction of rooftop is planned in favor of thermal buffer functioning, at least over 200㎜thickness would bring about the sufficient outcome.
5. To accelerate the thermal buffer functioning of the rooftop level, the use of materials which have large heat capacity is needed and of a reflector is also necessary.
6. The result of the experiment discloses that the main factors affecting the rise of interior temperature of the miniature are heat coming from the rooftop level and sunlight and radiation coming through the windows at the balcony. Thus, the further studies into whether sunlight load in the rooftop level affects more than sunlight load at the balcony the miniature’s interior or vice versa, will be necessary in the future.
In the area of architecture, there are a number of studies on energy saving and of the cases where various systems are in effect applied to building. The components of building include wall and roof. While in the case of wall, the use of various ornaments and insulation would lead to energy saving, in the case of roof, even the roof with insulation could directly receive strong sunlight resulting in the occurrence of a lot of cooling load at its top. Rooftop greening is regarded as a way to settle this issue, namely to lessen load at its top, while forming Bio Top simultaneously. But in practice, it is difficult to implement rooftop greening in small house has due mainly to the cost. Shedding light upon roof, in particular rooftop, amongst the components of a building, this study considers the way to lessen cooling load and to deal with interior heated environment at the top of a building. Miniature experiment has been conducted to examine the interior thermal environment at the top level that can vary according to each material forming a building; for this, materials forming the roof, which can affect the sunlight block effect the rooftop is to have, have been selected. The study intends to present itself as a basic data on the interior thermal environment at the top level which will be needed in building design. In order to identify to what degree the thickness of rubber mat and of rooftop greening, which performs the thermal buffer function at the rooftop, can affect the surface of interior ceiling and interior temperature, miniature was created, and that degree was estimated at 10 minutes intervals. The result of this experiment shows that the surface of rooftop level on which sunlight has direct effect may affect the rise of interior temperature to a great degree. This result can be summarized as follows.
1. It has turned out that it is significantly advantageous to cover rooftop level with the material that can play the role of thermal buffer between air and the surface of rooftop in lessening interior cooling load of the miniature.
2. It has been observed that in the case of rooftop greening consisting of soil and lawn, rather than rubber mat, interior temperature is lower than exterior temperature
3. When setting up rubber mat, it is necessary to diminish the flow of air as much as possible by making it fully attached to the surface, and when attaching a rubber mat to another rubber mat, it should be done in a way that reduces the flow of air.
4. To compare rubber mat to rooftop greening, as to the identical 100㎜ thickness, (+) and (-) value are displayed at the same time, and as to over 200㎜ thickness, all displays (-) value. Also, when comparing 200㎜ thickness with 300㎜ thickness, the cooling load of the former turns out to be reduced by around 2.4 times. Thus, it can be said that in the case where construction of rooftop is planned in favor of thermal buffer functioning, at least over 200㎜thickness would bring about the sufficient outcome.
5. To accelerate the thermal buffer functioning of the rooftop level, the use of materials which have large heat capacity is needed and of a reflector is also necessary.
6. The result of the experiment discloses that the main factors affecting the rise of interior temperature of the miniature are heat coming from the rooftop level and sunlight and radiation coming through the windows at the balcony. Thus, the further studies into whether sunlight load in the rooftop level affects more than sunlight load at the balcony the miniature’s interior or vice versa, will be necessary in the future.
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