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How efficient are HVAC systems in filtering virus
The APS manual highlights concerns about the effectiveness of HVAC system upgrades in mitigating COVID-19 transmission. While authorities have recommended increasing ventilation and upgrading filters to MERV 13, APS questions the necessity and efficacy of these measures.
DX Cooling Opportunity
HVAC systems that mix fresh air and building return air to varying quantities for cooling purposes often have control logic comparing the total heat content of the outdoor to the total heat content of the return air.
HVAC logic improvements
APS has developed many unique HVAC logic circuits: improving comfort and reducing energy consumption. The reductions caused the avoidance of over 60,000 person-years of GHG emissions with a three-person crew.
Enthalpy Report
Enthalpy is the total heat content value in air, considering both dry bulb temperature and relative humidity level. If either value changes while the other is constant the enthalpy value has to change.
Bourdon Tube Investigation
Industry experts contacted indicated that the volume of a Bourdon tube does not change while flexing or they had no data on this consideration. If the industry consensus is true, work output can exceed work input (Wout ˃ Win) as per an APS experiment.
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