| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 98 === This thesis aims to conduct the qualitative and quantitative research for the energy conservation in building by using the ventilated shading plate on the western external walls. The simulations were conducted using the commercial, well-known, general-purpose CFD code, FLUENT. The steady-state simulation results show that the western external wall with thickness 0.25m can reduce 41% heat gain by using the ventilated sun shading plate. The dynamic simulations add the thermal storage effect of the building thermal mass, and the results show that the time lag of the western external wall with thickness 0.25m is 4.3 hours, when installing the ventilated sun shading plate, the time lag is increased to 7 hours, and the maximum heat gain can be reduced 46% within one day. In this study, we use the equivalent thermal resistance concept to evaluate the energy conservation performance of the ventilated shading plate, the simulation results show that the total resistance of the western external wall increase 70% by using the ventilated shading plate. Finally, We use the low-energy house which is built by the New Energy Center in NTU as the validation object of the equivalent thermal resistance concept, and good agreement between the measured data and the simulation results was obtained. The results also show that after the installation of ventilated shading plate, the U-value of the low energy house external wall is less than 0.15W/m2K, while Germany''s building energy conservation standards specify that the U-value of the low energy consumption buildings external wall should less than 0.3W/m2K, as a result, the low-energy house has reached the low energy building standard.
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