HVAC Systems and Indoor Air Quality

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How Much Ventilation? ❂ ASHRAE St<strong>and</strong>ard 62-89: • cfm O/A per person • or go “scientific” ❂ Proposed Revision to 62-89 ● cfm/person + cfm/ft 2 ● i.e., people + building ❂ Other approaches: ● Olf (the nose test) ● exposure limits
People & Pollution ❂ Some emission rates correlate to people’s activities ❂ People consume oxygen ❂ People can have diseases which are air borne ❂ Carbon dioxide (CO 2 ) levels can be an indicator of overall indoor air quality
Page 1 and 2: HVAC Systems and Indoor Air Quality
Page 3 and 4: HVAC Systems are Dynamic Heat Gains
Page 5 and 6: The Purpose of HVAC Systems H V A T
Page 7 and 8: More Definitions ❂ cfm: cubic fee
Page 9 and 10: HVAC Control Strategies ❂ Outline
Page 11 and 12: Two Contaminant Control Strategies
Page 13 and 14: Two Dilution Methods 1. Natural •
Page 15 and 16: Natural Ventilation ❂ Disadvantag
Page 17: Mechanical Ventilation ❂ How much
Page 21 and 22: The Economizer Section EXHAUST RETU
Page 23 and 24: Ignoring Infiltration 200 cfm 1,000
Page 25 and 26: Ventilation Summary Source Emission
Page 27 and 28: Filters Gases Viruses Smoke Dust Po
Page 29 and 30: Filter Types ❂ Standard (panel, p
Page 31 and 32: Humidification ❂ Desired Range 30
Page 33 and 34: Ducts Sources: ● ● ● ● Acou
Page 35 and 36: Intakes ❂ Proximity to Exhausts:
Page 37 and 38: Moisture ❂ Sources • Humidifier
Page 39 and 40: Combustion ❂ Sources • Faulty H

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