Abstract
Indoor air quality in buildings must be guaranteed for the health and comfort of the occupants. In order to assess the ventilation strategy of a considered room, the parameter of the air change efficiency ( ε a ) can be used. The objective of this work is to provide designers with a graphical tool for a reliable estimate of the value of ε a of a room. The temperature gradient between the outdoor air supply and the indoor air is so low that the ventilation flow can be assumed as isothermal when high-efficiency heat recovery systems are used. By means of charts, the optimal location of the openings for a better ε a can be determined during the design process, in order to subsequently apply them. It is concluded that it is very important to consider the ε a in the case of openings located in facing walls given that its range varies between 40% and 65%. In contrast, its use can be obviated in the case of openings located in non-facing walls, as the value of ε a obtained is close to 50%; this means a perfect mixing air flow pattern, which is the reference value for the estimation of the indoor air quality (IAQ) in the different national regulations.
Highlights
The air quality in indoor environments is essential for the well-being of their occupants
Different national building regulations include requirements regarding indoor air quality (IAQ) based on performance that entails enough outdoor air flow to guarantee the dilution and subsequent exhaust of the polluted air
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Summary
The air quality in indoor environments is essential for the well-being of their occupants. Where the local mean age of the air, τe, is a statistical value of the average time it takes fresh air particles to flow from the inlet to the point under study (in this case, the exhaust). Sustainability 2020, 12, 1031 where the local mean age of the air, τe, is a statistical value of the average time it takes fresh air particles to flow from the inlet to the point under study (in this case, the exhaust). This research focused on the characterization of the impact of the relative location (vertical and horizontal distance) of the inlet and exhaust openings on the air flow pattern This parameter is essential to determine the efficiency, εa, which is the dilution and exhaust capacity of polluted air through ventilation with heat recovery [16]. The use of the air change efficiency parameter, εa, is recommended in the literature [20] to characterize rooms where the location of the contaminating source is not specified and, at the same time, an adequate IAQ is desired in the entire volume of the room
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