Abstract
The number of sudden deaths while bathing related to heat shock in Japan is approximately 17,000 people for a year. This number is over 30% of elderly people dying in the residential buildings. To solve this problem, it is effective to introduce a whole-house air conditioning system in the residential buildings. The purpose of this study is to evaluate the applicability of the whole-house air conditioning system in cold climate district in Japan. To achieve this goal, this study is evaluated the thermal environment by using the whole-house air conditioning system and compared with individual air conditioning system. The results show that the maximum room temperature difference is measured approximately 6.8 ºC. As the reverse simulation in the study, this temperature difference can be decreased to approximately 4 ºC by adjusting the supply airflow rate. When the individual air conditioning is used, the room temperature difference is 7.5 ºC. It means that using the whole-house air conditioning system decreases the room temperature difference and reduces heat shock risk. It is also possible to raise the surface temperature of the wall by 20 to 30 % than in case of using individual air conditioning, thus it is effective in preventing dew condensation on the wall surface.
Highlights
IntroductionA local air-conditioning for occupied room is mainly used in Japan, individual cooling and heating units placed in each room of the house such as a stove, an air conditioner (hereinafter abbreviated as AC), and a kotatsu etc
A local air-conditioning for occupied room is mainly used in Japan, individual cooling and heating units placed in each room of the house such as a stove, an air conditioner, and a kotatsu etc
The CFD model was consistent with the actual measurement and it is possible to reproduce the indoor thermal environment with the actual findings
Summary
A local air-conditioning for occupied room is mainly used in Japan, individual cooling and heating units placed in each room of the house such as a stove, an air conditioner (hereinafter abbreviated as AC), and a kotatsu etc. The number of deaths due to heat shock is estimated to be 17,000 people per year in Japan [1], accounting for about 30% of the 59,416 deaths from annual accidents [2] To solve this problem, the central cooling and heating system has been received attention to prevent the heat shock in residential buildings. The purpose of this study is to evaluate the indoor thermal environment by the whole-house air conditioning system in cold climate district in Japan. The indoor thermal environment compares with individual air conditioning system
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