戸建木造住宅のレンジファンを用いた簡易気密性能確認法の精度検証

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タイトル別名
  • A VERIFICATION OF SIMPLIFIED EXAMINATION METHOD ON AIRTIGHT LEVEL USING A RANGE FAN OF WOODEN DETACHED HOUSES
  • コダテ モクゾウ ジュウタク ノ レンジファン オ モチイタ カンイ キミツ セイノウ カクニンホウ ノ セイド ケンショウ

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抄録

 The aim of this study is to verify a simple examination method on airtight level “single point method”. In this method, equivalent leakage areas: C and exponents on leakage characteristic: n were measured using a pressure-sensor, a CO2-analyzer, a gas range and a range food fan which is installed in houses. An inside-outside pressure difference and an air flow rate through the range fan was measured when the range fan and the gas range are used. The air flow rate is calculated using the generation rate of carbon dioxide from combustion gas and the concentration of carbon dioxide in the exhaust air. C and n were calculated from the pressure difference and the air flow rate, using a characteristic of n toward C. The characteristic was prepared from former measurements data on airtightness in the similar houses.<br> In order to verify this simple method, airtightness was measured using a general method according to JIS and using this simple method in ten wooden detached houses. The results showed the followings.<br> 1. The equivalent leakage area per its floor area of the investigated houses varied from 0.4 to 3.0 cm2/m2 and the exponent of leakage characteristic: n was from 1.1 to 1.6. The characteristics of n toward C was similar to the former studies.<br> 2. The results of the simple method (single-point method) were very similar to those of general airtight test (JIS). However, the results of the simple method is rather than those of general method. One of the reason was thought to be that the collection efficiency of the range hood was higher than 85% which was used in order to calculate C-value.<br> 3. Both the measurements results of this study and the measurement results of former study showed that the accuracy of single point method was very high in the case of C-value, however rather low in the case of n-value.<br> These results showed that when the measurements data of airtightness are obtained, it is easy to examine the airtight revel of houses. It is desired that this simple method is used and contribute for the improvement of airtightness, development of ability for airtight and the performance guarantee.

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