Methodology for the Evaluation of Natural Ventilation in ... - Cham

21-Oct21-Oct22-Oct22-Oct23-Oct24-Oct24-Oct25-Oct25-Oct26-Oct27-Oct27-Oct28-Oct29-Oct29-Oct30-Oct30-Oct31-Oct1-Nov1-Nov2-Nov3-Nov3-Nov4-Nov4-Nov5-Nov6-Nov6-Nov7-Nov8-Nov8-NovTemperature ( C)Temperature ( F)3530South Average TemperatureNorth Average TemperatureOutside Air Temperature928225722015621052542032Figure 20. Fall Average Building Internal Temperature by Orientation: North versus SouthSummer data were collected during the heat wave that occurred during the summer of 2003 inthe UK, which provided data on the performance of this naturally ventilated building duringextreme conditions. Though the external temperature reached over 36 ºC, the average internaltemperature within the building was 30ºC, significantly lower than the outside. It was observedthat when these high temperatures occurred during the workday, occupants wore lighter clothingand used personal fans to generate a breeze to improve their comfort. When comparing theinternal and external temperatures to an adaptive standard for naturally ventilated buildingsbased on ASHRAE Standard 55 (Brager 2000, ASHRAE 2004), the internal temperatures fallwithin the 90 percent acceptability limits. Normally the temperate climate has approximately 30hours when the outside air temperature is at or above 26ºC, whereas in 2003 there were overthree times as many with 98 hours. As for internal conditions, there were 119 hours during thesummer of 2003 when the average building internal temperature was at or above 26ºC; howeverthirty percent of this was during unoccupied hours.60