日射量の変化による密閉コンテナ内の温度, 湿度応答(日本航海学会第45回講演会)

抄録

The solar radiation intensity and the air temperature and humidity inside and outside a closed dry container were observed at the campus of Kobe College of Mercantile marine in Kobe city on 3rd. (cloudy), 6th. (rainty) and 7th. (sunny) Aug.1971. Some results are as follows ; (1) It is important to find out not only the meam value but also variations in temperature and humidity which vary with in order to know the weather situations in detail, to protect the cargo from sweat damage and to design a good container. (2) On the above three days the mean value of the transmisivity. P of solar rodiation through the atmosphere and the ratio of the observed solar radiation intensity to the theoretical one J_n/J_<n, th> are (0.65, 0.53 ; 3rd (cloudy), (0.35, 0.18 ; 6th (rainy)) and (0.75, 0.65 ; 7th. (sunny)) respectively, so, it is cleared that humidity (specially clouds) bas stronger injluehce on P and Jn than pure air and the duet in the atmospbere. (3) They proposed to use a statistical method with a certain distribution curve which deals with the mean value and variation of the time-varing temperature and humidity, and want to note there are two types of distribution: one is a wide range and the other is a narrow one, for the weather situation the former means a changable weather, the latter does an unchangable one, besides for the rang tempemperature the former means the change of outside face temperature t_f of one container, the latter does that of ambient air temperature t_o outside the container (4) For the temperature response at some point of container, the variation of t_f is about five〜ten times of that of middle portion temperature t_4 in the contaiher, and the peak of t_4 follows on that of t_f with a lag time of about 15〜20 minutes. (5) They want to point out the following two indices which are useful for the purpose of optimal route and package to minimize sweat damage and to do quality control for the corgo ; (i) total hours (t_f is below t_4) of the day…ΣΔt_<f4>/24 because in the former period Δt_<f4> (ii) tolol hours (t_f is below the dew point d_4 of the air in the container) of the day…ΣΔt_<fd>/24 because in the former period Δt_<f4> condensation is expected to happen in the container wbose outside face is wetten, in the latter one Δt_<fd> condensation and wetting cargo actually happens in the container as t_f is usually decreasing at sunset.