If the outdoor air did not meet these requirements, filtration or other air treatment was required to meet these criteria. Ventilation air also is considered not acceptable if the concentration of any contaminant exceeded one-tenth of the threshold limit value issued by the American Conference of Governmental Industrial Hygienists. f ederal criteria - promulgated in 1975 for several outdoor contaminants. 1 - defined acceptable air quality for ventilating buildings based on U.S. Part 1 to 3 of the standard is about purpose, scope and definitions. In addition, outside air will normally be treated prior introducing to a building. This include s positive pressure ventilation, exhaust ventilation and balanced system s that use both supply and exhaust ventilation. Mechanical ventilation refers to any system that uses mechanical means, such as fan s, to introduce outside air in to a space or removing air from a space. Natural ventilation can only be achieved within certain distance of a building perimeter and there is no treatment to the outside air. Natural ventilation refers to intentionally designed passive methods of introducing outside air to a space without the use of a mechanical system. Ventilation of a building can be achieved by means of natural ventilation, mechanical ventilation or combination of both. Ventilation is the intentional introduc tion of outside air into or removing air from a space and is mainly used to control IAQ by diluting and displacing or removing indoor pollutants. Means of ventilationīuilding ventilation has long been recognized for its role in occupant health, comfort and productivity. T he purpose of the standard remains unchanged, which is to specify minimum ventilation rates and other measures intended to provide IAQ acceptable to human occupants by minimizing adverse health effects. The s tandard has undergone key revisions over the years, reflecting the expanding knowledge, experiences and research related to ventilation and air quality. The s tandard is updated regularly by the ASHRAE Standing Standard Project Committee and has been re vised every three years since 200 1. Going far beyond the minimum requirements, i t provides information and tools building designer s can use to achieve IAQ sensitive building design integrated with other design goals, budget constraints and functional requirements.ĪSHRAE Standard 62 has served as one of the most prominent ventilation standards since it was first published in 1973. The g uideline cover s design, construction and commissioning of IAQ. 1 with practical examples of compliance and explai ns the b asis of ventilation rate requirement and calculation methods. It provides information on how to use and apply S tandard 62. The user manual contains explanatory material, detailed information, figures and examples to aid user in designing, installing and operating buildings. 1, which is written to be code enforceable and therefore contain s only mandat o ry language. The u ser’s m anual is intended to be used as a companion to S tandard 62. ASHRAE 62.1 -2016 includes appendix A through K, with only Appendix A and B being normative appendices and part of the s tandard. Informative appendices are merely intended to provide knowledge with no conformance requirements. Normative appendices are part of the s tandard and provide alternative procedures for compliance to the s tandard. Appendices include two types : normative appendices and informative appendices.
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