This research was conducted to study the performances of the heat and multilayer reflection insulators used for buildings in South Korea to realize eco-friendly,low-energy-consumption,green construction,and to contrib...This research was conducted to study the performances of the heat and multilayer reflection insulators used for buildings in South Korea to realize eco-friendly,low-energy-consumption,green construction,and to contribute to energy consumption reduction in buildings and to the nation's greenhouse gas emission reduction policy(targeting 30% reduction compared to BAU(business as usual) by 2020).The heat insulation performance test is about the temperatures on surfaces of test piece.The high air temperature and the low air temperature were measured to determine the overall heat transfer coefficient and thermal conductivity.The conclusions are drawn that the heat transmission coefficients for each type of existing reflection insulator are:A-1(0.045 W/(m·K)),A-2(0.031 W/(m·K)),A-3(0.042 W/(m·K)),A-4(0.078 W/(m·K)),and the average heat conductivity is 0.049 W/(m·K);The heat conductivity for each type of Styrofoam insulator are 0.030 W/(m·K) for B-1,0.032 W/(m·K) for B-2,0.037 W/(m·K) for B-3,0.037 W/(m·K) for B-4,and the average heat conductivity is 0.035 W/(m·K) regardless of the thickness of the insulator;The heat conductivity values of the multilayer reflection insulators are converted based on the thickness and type C-1(0.020 W/(m·K)),C-2(0.018 W/(m·K)),C-3(0.016 W/(m·K)),and C-4(0.012 W/(m·K));The multilayer reflection insulator keeps the indoor-side surface temperature high(during winter) or low(in summer),enhances the comfort of the building occupants,and conducts heating and moisture resistance to prevent dew condensation on the glass-outer-wall surface.展开更多
We reported previously the idea to improve reflection-ability of a magnetic mirror by installing a cyclotron resonance space in the front part of the mirror. However, since the previous analysis was insufficient from ...We reported previously the idea to improve reflection-ability of a magnetic mirror by installing a cyclotron resonance space in the front part of the mirror. However, since the previous analysis was insufficient from the examination after that, we complement the following two things in this work: 1) A simpler procedure of design to make a supplemental magnetic mirror with the simplest magnetic configuration, compared with the procedure reported previously. 2) A peculiar characteristic arising only in reflection of a nonrelativistic charged particle (a deuteron ion).展开更多
In this paper,the protective performance of woven fab-rics against heat radiation is studied from the view offabric structure.As indices reflecting the protective per-formance against heat radiation,the heat emissivit...In this paper,the protective performance of woven fab-rics against heat radiation is studied from the view offabric structure.As indices reflecting the protective per-formance against heat radiation,the heat emissivity andthe transmissivity of different fabrics are measured.It ispointed out that structure changes of common textiles af-fect their transmission to heat radiation while have littleinfluence on their absorption or reflection to heat radi-ation except fabrics surfaces are aluminized.Double-layer weave is proved to be an effective fabric weave forreducing the trasmissivity.It helps increase the densityand tightness while keeps the comfort of woven fabrics atthe same time.展开更多
This paper presents the solution of coupled radiative transfer equation with heat conduction equation in complex three-dimensional geometries. Due to very different time scales for both physics, the radiative problem ...This paper presents the solution of coupled radiative transfer equation with heat conduction equation in complex three-dimensional geometries. Due to very different time scales for both physics, the radiative problem is considered steady-state but solved at each time iteration of the transient conduction problem. The discrete ordinate method along with the decentered streamline-upwind Petrov-Galerkin method is developed. Since specular reflection is considered on borders, a very accurate algorithm has been developed for calculation of partition ratio coefficients of incident solid angles to the several reflected solid angles. The developed algorithms are tested on a paraboloid-shaped geometry used for example on concentrated solar power technologies.展开更多
基金Project(NRF-2010-0024155) supported by the National Research Foundation of Korea
文摘This research was conducted to study the performances of the heat and multilayer reflection insulators used for buildings in South Korea to realize eco-friendly,low-energy-consumption,green construction,and to contribute to energy consumption reduction in buildings and to the nation's greenhouse gas emission reduction policy(targeting 30% reduction compared to BAU(business as usual) by 2020).The heat insulation performance test is about the temperatures on surfaces of test piece.The high air temperature and the low air temperature were measured to determine the overall heat transfer coefficient and thermal conductivity.The conclusions are drawn that the heat transmission coefficients for each type of existing reflection insulator are:A-1(0.045 W/(m·K)),A-2(0.031 W/(m·K)),A-3(0.042 W/(m·K)),A-4(0.078 W/(m·K)),and the average heat conductivity is 0.049 W/(m·K);The heat conductivity for each type of Styrofoam insulator are 0.030 W/(m·K) for B-1,0.032 W/(m·K) for B-2,0.037 W/(m·K) for B-3,0.037 W/(m·K) for B-4,and the average heat conductivity is 0.035 W/(m·K) regardless of the thickness of the insulator;The heat conductivity values of the multilayer reflection insulators are converted based on the thickness and type C-1(0.020 W/(m·K)),C-2(0.018 W/(m·K)),C-3(0.016 W/(m·K)),and C-4(0.012 W/(m·K));The multilayer reflection insulator keeps the indoor-side surface temperature high(during winter) or low(in summer),enhances the comfort of the building occupants,and conducts heating and moisture resistance to prevent dew condensation on the glass-outer-wall surface.
文摘We reported previously the idea to improve reflection-ability of a magnetic mirror by installing a cyclotron resonance space in the front part of the mirror. However, since the previous analysis was insufficient from the examination after that, we complement the following two things in this work: 1) A simpler procedure of design to make a supplemental magnetic mirror with the simplest magnetic configuration, compared with the procedure reported previously. 2) A peculiar characteristic arising only in reflection of a nonrelativistic charged particle (a deuteron ion).
文摘In this paper,the protective performance of woven fab-rics against heat radiation is studied from the view offabric structure.As indices reflecting the protective per-formance against heat radiation,the heat emissivity andthe transmissivity of different fabrics are measured.It ispointed out that structure changes of common textiles af-fect their transmission to heat radiation while have littleinfluence on their absorption or reflection to heat radi-ation except fabrics surfaces are aluminized.Double-layer weave is proved to be an effective fabric weave forreducing the trasmissivity.It helps increase the densityand tightness while keeps the comfort of woven fabrics atthe same time.
文摘This paper presents the solution of coupled radiative transfer equation with heat conduction equation in complex three-dimensional geometries. Due to very different time scales for both physics, the radiative problem is considered steady-state but solved at each time iteration of the transient conduction problem. The discrete ordinate method along with the decentered streamline-upwind Petrov-Galerkin method is developed. Since specular reflection is considered on borders, a very accurate algorithm has been developed for calculation of partition ratio coefficients of incident solid angles to the several reflected solid angles. The developed algorithms are tested on a paraboloid-shaped geometry used for example on concentrated solar power technologies.
