HVAC magasinet Nr. 1 (2010) Page 32

<h1>HVAC magasinet Nr. 1 (2010) Page 32</h1>I n t e r n a t i o n a l f o r s k n i n g Læs 1. del af artikelserien i HVAC magasinet nr. 12 - 2009, side 44. Ventilation filters may pollute the indoor air: Part 2 - Economic impact and solutions. An article in the last issue of the HVAC Magasinet described why used filters in a ventilation system, when not replaced frequently enough, can have an adverse impact on perceived air quality, sick building syndrome symptoms, and performance of office work. The present article focuses on the possible economic impact of such polluting filters and the engineering solutions feasible to overcome the problem pant productivity due to sensory offending pollutants emitted from used ventilation filters can lead to significant economic losses. In order to monetize the endpoints, US dollars were used. This is due to the fact that the most comprehensive input data for these calculations are monetize. For example, it is challenging to precisely determine how much the pollution from loaded filters can influence workers' productivity. Various studies showed that this effect can be as high as 10% and filters can start polluting after 3 months of operation. However, pends on the perspective of the stakeholder: the employer renting the building is impacted by occupant performance and building energy costs; the building owner is impacted by maintenance of the building and its HVAC system; the society is impacted by the employ- By Gabriel Bekö According to the US Environmental Protection Agency poor indoor air quality costs the United States tens of billions of dollars annually in lost productivity and medical care. It is not known with certainty to what extent various ventilation filters can affect these outcomes. While their potential to remove particles from the supply air is highly beneficial, the processes occurring on surfaces of used filters and their adverse impact on the environmental quality are not fully understood at the present. We derived crude estimates of the initial costs, annual running costs and the corresponding monetary benefits of particle filtration for a standard office building using single-stage F7 pocket-type filtration. Based on available epidemiological data, we estimated how much the reduction in occupants' exposure to particles during their workday may reduce their mortality and morbidity. Regarding morbidity, the following health effects of particles were included in the model: respiratory hospital admissions, asthma emergency room visits, minor restricted activity days and work loss days. Filtration may also reduce the costs associated with building and HVAC cleaning. Conversely, losses of occu32 Figure 1. Lower, central and upper estimates of the aggregated benefits and costs of particle filtration from the perspective of the society. The lower estimate calculates with 0% productivity loss, the central estimate with 0.5% productivity loss over 50% of the filter's total service time and the upper estimate predicts a 1% productivity loss over 75% of the filter's lifetime. available for the United States. There are several ways to assign a dollar value to the positive health effects of decreased exposure to particles. Other endpoints can be rather difficult to sensitivity analyses can provide a lower, central and upper estimate of the endpoints within the most relevant range of the input parameters (figure 1). The benefits-to-costs ratio dewww.lindab.dk ees' health and welfare (figure 1). As a result, regardless of perspective, particle filtration is anticipated to lead to annual savings significantly exceeding the running costs for filtration. HVAC 1 · 2010 Bedre indeklima. 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