Weather Data Compilation for Design and Average Heat Load Calculation at any Location in the World : Part 2-Estimation Methods of Hourly Weather Values Based on Monthly Data

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  • 世界の任意地点における設計および平均熱負荷計算のための気象データに関する研究 : 第2報-気象データ月統計値に基づく時刻別値の推定法
  • 世界の任意地点における設計および平均熱負荷計算のための気象データに関する研究-2-気象データ月統計値に基づく時刻別値の推定法
  • セカイ ノ ニンイ チテン ニ オケル セッケイ オヨビ ヘイキンネツ フカ

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Abstract

In the previous report, BMO and JMA, the computer files consisting of the monthly weather data at more than 3700 stations in the world, were compiled. In this report, hourly values of the meteorological parameters, such as dry-bulb temperature, solar radiation, humidity ratio, nocturnal radiation, wind speed and wind direction, are estimated based on the monthly data in the two files. Hourly temperatures for a typical day of each month through a year are generated from the following values and equations: 1) monthly mean values of daily maximum temperatures, and of daily minimum temperatures (these values are included in the files), 2) the possible times of the day when the maximum and minimum temperatures occur, 3) the equations representing the curves between the maximum and minimum temperatures. To generate hourly temperatures for an extreme day, daily maximum and daily minimum temperatures corresponding to a given frequency level such as 5%, 10% or 20% of a cooling or a heating month are estimated from the data in the files, then the same method as used for a typical day is applied. Monthly mean daily global solar radiations through a year are included in the files. However, daily global solar radiation for a clear day is necessary for design cooling load calculation. Therefore, the multiple regression equation predicting the transmittance of the atmosphere for a clear day is developed. Using the equation, global solar radiation at solar noon can be calculated at any location in the world. Global solar radiations at the other times during the day are calculated according to the relation between daily and hourly solar radiations developed by Collares, Pereira and Rabl. The values of cloud amount, wind speed and wind direction at 6, 12, 18 and 24 GMT (Greenwich Mean Time) are included in the files. Based on the proposed interpolation methods, the hourly values for each of these meteorological parameters for a typical day of each month are generated. Relative humidities coincident with the maximum and minimum temperatures are included in the files. Hourly relative humidities through a day are generated by the same method as used for dry-bulb temperature mentioned above. Then hourly humidity ratios are calculated using hourly temperatures and relative humidities. Hourly nocturnal radiations are computed from hourly temperatures, humidity ratios and cloud amounts.

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