モデル計算による暖房設計用外界条件の検討  [in Japanese] Simulation Analysis of Outdoor Conditions for Heating Design  [in Japanese]

Abstract

周期定常負荷計算を前提とした暖房設計用外界条件を設定する目的で,モデル計算を行った.モデル計算の負荷を大きさの順に順位付け,その累積度数率から設計条件を決定する方法を用いた.この方法は,建物というフィルタを通した負荷そのものに注目しているので,建物側条件さえ合えば設計用負荷決定に最も適切な結果を導くものと考えられる.種々の建物側条件によりどのような設計外界条件が設定され,逆にその条件の下で負荷計算を行った場合に,結果がどのようになるかの検討を行った.

The paper describes simulated load calculation made in an attempt to establish appropriate outdoor conditions for use in heating design by the use of the periodic steady state method. Conditions for Model-based Computation The models were prepared assuming ordinary office rooms in buildings located in Tokyo. Models were made to represent rooms facing north, east, south, west and all the four directions. Using these models, computations were made for nine seasons from December 1960 to March 1969. Determination of Load Sequence At the outset, load computation was made. Based on the computed loads, sequential numbers were given to all days in the descending order of volume of daily max. loads. The load on the 27th day from the top of the list (corresponding to the last day in the top 2.5% group of days) was adopted as "Design Heating Load." Assumption of Design Outdoor Conditions Daily heat loads on days in top group were summed up and averaged and the number of days involved were counted repetitively in order to see how many days from the top of the list must be considered if their average heat loads are to be equated to "Design Heating Load." According to "Climatic Pattern Classification," all the selected days were sorted into "Fine," "Cloudy" and other patterns. Thereafter, the weather data were processed to obtain every hourly and pattern-sorted average data. From these average data, values applicable to a period during 10:00 AM on the previous day through 9:00 AM on the given day were selected, combined and assumed as design outdoor conditions. In both fine-day and cloudy-day patterns, those values were found to exemplify inherent features of typical fine and cloudy days. In each pattern, the temperatures and humidities thus obtained turned out larger than the TAC-established values. Computation for Design Next, max. loads were computed by the periodic steady state calculation method using the aforesaid design outdoor conditions and the computed data was compared with the said design heating loads. Table 12 shows comparison of those two types of loads. Also shown for reference purpose are values computed using TAC 2.5% (in terms of both temperatures and humidities) in which solar radiation is neglected. Obviously, different outdoor conditions must be applied to rooms having different orientations. Use of TAC-established values which are on the safe side in every respect is likely to result in over-estimated design loads. In order to establish design outdoor conditions which are more appropriate for the building conditions, efforts must be made to broaden the scope of studies to cover a greater range of building requirements.

Journal

Transactions of the Society of Heating,Air-Conditioning and Sanitary Engineers of Japan.   [List of Volumes]

Transactions of the Society of Heating,Air-Conditioning and Sanitary Engineers of Japan. (8), 11-22, 1978-10-25  [Table of Contents]

The Society of Heating, Air-Conditioning Sanitary Engineers of Japan

Cited by:  2

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Codes

  • NII Article ID (NAID) :
    110007864477
  • NII NACSIS-CAT ID (NCID) :
    AN00065706
  • Text Lang :
    JPN
  • Article Type :
    Journal Article
  • ISSN :
    0385275X
  • NDL Article ID :
    1969220
  • NDL Source Classification :
    NA91(建築設備)
  • NDL Source Classification :
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No. :
    Z16-955
  • Databases :
    CJPref  NDL  NII-ELS 

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