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دانلود رایکان مقاله انگلیسی ISI با موضوع استنتاج مقاومت حرارتی و جرم حرارتی موثر یک دیواره

عنوان فارسی مقاله:

استنتاج مقاومت حرارتی و جرم حرارتی موثر یک دیواره با استفاده از اندازه گیری های دمای مکرر و شار گرما

عنوان انگلیسی مقاله:

Inferring the thermal resistance and effective thermal mass of a wall using frequent temperature and heat flux measurements

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2. Case study and monitoring campaign

The dataset analysed in this paper was collected during the winter of 2010 by the Building Services Research and Information Association (BSRIA) as part of a study to investigate the U-values of walls in occupied domestic properties [21]. Walls at 93 different sites across England were monitored and were expected to be solid (with no cavity or insulation). Measurements were collected in accordance with ISO 9869:1994 [21,22]. Sensors were ideally placed on north-facing walls to exclude the impact of solar radiation on the external surface and away from internal sources of heat [21]. Moreover, sensors were usually placed with reference to structural features; however, sensor location was compromised in some cases for the convenience of the occupants [21]. The wall was instrumented with a heat flux meter (HFM) and thermistor temperature sensors [22]; the data were averaged over 5 minutes and recorded by Eltek 401 [27] data loggers. The HFM (Hukseflux HFP01 [28]) was placed on the inside surface of the wall. Silicon grease was used to achieve good thermal contact between the HFM and the wall surface, while a thin PVC film was applied to protect the wall surface. The thermistors were placed in the air near the internal and external surfaces of the wall. Internally the temperature sensor was placed as close as possible to the HFM. Surface mounted thermometers are often used to minimise deviations due to air movements and wind [29]. However, fixed estimates of the boundary layer resistances must then be incorporated into U-value calculation. Appropriately placed air temperature thermometers can be used to account for real environmental conditions adjacent to the wall and better reflect the real in-situ U-values.