16 assumptions are provided in the appendix of Climate-Driven Design volume I. This booklet serves as a companion document to other Building Technology Press textbooks and includes references to relevant book sections for further information. For example, CDDI-10 stands for ClimateDriven Design I chapter 10. The remainder of this chapter presents the three step HVAC selector framework starting with the type of ventilation system desired. Ventilation Type The choice of HVAC system for a particular building or portion of a building is inextricably linked to its ventilation requirements, i.e. how much fresh, outdoor air per unit time is needed to properly operate all enclosed spaces in the building. Air flow rates are measured in volume per time such as liter per second (l/s) or cubic feet per minute (ft3/min). The American Society of Heating, Refrigerating and Air-Conditioning Engineers' (ASHRAE) standard ASHRAE 62.1 Ventilation and Acceptable Indoor Air Quality specifies ventilation requirements based on program type, peak number of occupants and floor area (CDDII-10).7 For the Medium Office Boston, the required area and person based flow rates are 0.3l/s/m2 and 2.5 l/s/person, respectively. Assuming a peak occupancy density of 0.057 person/m2, the required fresh air flow rate, Qfresh air, is Fig 1.5 Perspective of the Medium Office Boston from the Climate-Driven Design I textbook
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