9 日射量に関する研究 : I.測定法と1、2の例題的分析

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タイトル別名
  • 9) STUDY ON THE SOLAR RADIATION
  • 日射量に関する研究-1-
  • ニッシャリョウ ニ カンスル ケンキュウ 1

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The solar radiation has much contribution to the heating or cooling load of the air conditioning system and other purposes. At the load calculation, it is necessery to know the daily change of radiant energy on the horizontal and vertical surfaces, in both the monthly or seasonal average value and the instantaneous maximum value. But in Japan we have not enough data of those values. The measurements of solar radiation were begun at Tokyo Univ. in Feb. 1959 and now are going on. The contents and the apparatus employed are as followings:- (1) The total radiations on a horizontal surface and four vertical surfaces facing East, West, South and North, with Eppley pyrheliometers. [Fig. 2・1] In the white painted box, about 40cm square in base and 30cm in height, five pyrheliometers are set. To prevent the ground reflexions, a black painted wire netting of about 2m square is drawn around the box. (2) The direct solar radiation at normal incidence with a new designed pyrheliometer which moves round following the sun. Its element is the Gorczinsky's thermo piles. [Fig. 2・2] Photos show the cylindrical body in which a synchronous motor and gears are equipped, and the rotating pyrheliometer at the top of the body. Usually a hemispherical glass, about 45cm in diameter, is used for weather proof. (3) The horizontal diffused sky radiation with a Eppley pyrheliometer and a shading ring. [Fig. 2・3] The ring, 100cm in diameter, is made of vinyl tube, 8cm in diameter. The Eppley pyrheliometer can move on the rail as the change of declination. Some examples of self recorded charts of the potentiometer are shown in [Fig. 3・1]. [Fig. 3・2] is the average daily variation curves in Feb. and Mar. 1959 on each surface. After having got at least a year's records, the whole analysis will be done.

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