春季における自然換気性状及び省エネ効果の実測•数値シミュレーションによる検討

摘要

本研究では、自然換気と空調システムの併用手法（以下、ハイブリッド空調システム）及び自然換気給排気口の流量制御機能を備えた実在オフィスビルを対象とし、実測·数値シミュレーションを行うことで、対象システムの自然換気性状及び省エネ効果を定量的に示すことを目的としている。前報（第一報）では、同オフィスビルの空調試運転時を対象とした自然換気量の数値解析モデルを提案し、実測との比較により同解析モデルの予測精度の検証を行った。%In this paper, in order to evaluate natural ventilation properties and energy saving effects of a hybrid air-conditioning system in an existing office building with flow control inlets and outlets in spring, measurements and thermal and air-flow network analyses were carried out. The following results were obtained:1)The behavior of the hybrid air conditioning system was shown in detail based on analyses of measured values for each floor and area within a month or a day. 2) The flow rate at all air supplies by natural ventilation was reduced to less than 1,400 m~3/h by flow control function and the average of each floor's natural ventilation rate was 13,984 m~3/h (twice the amount of required ventilation rate). 3) The mean calculation error for measurement values of ventilation rate was about 9.8％, and so the proposed calculation model had sufficient prediction accuracy. 4) In this analysis, cooling energy consumption was reduced about 22.3％ by the natural ventilation during this measurement. 5) Relations of natural ventilation rate to the flow control system, buoyancy caused by heat loads and energy consumption of cooling were clarified by case studies using the calculation model.