# APPLICATION GUIDE. Comparison of Latent Cooling Performance of Various HVAC systems in a Classroom Application

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1 APPLICATION GUIDE Comparison of Latent Cooling Performance of Various HVAC systems in a Classroom Application

3 Using the classroom example in Table 1; Ventilation Rate The ventilation rate is based on ASHRAE Std 62.1 single zone systems. This is the most straightforward method in ASHRAE Std 62. V bz = R p P z + R a A z V oz = V bz /E z V ot = all zones V oz (For 100% outdoor air systems like WBCS) where V bz = outdoor airflow rate in the breathing zone (cfm) R p = people outdoor air rate (cfm/person) P z = number of people R a = area outdoor air rate (cfm/ft²) A z = area (ft²) V oz = zone airflow rate (cfm) E z = zone air distribution effectiveness (E z = 1.0 for ceiling chilled beams) Occupancy (NP) = 30 Area = 1000 ft² R p = 10 cfm/person R p = 0.12 cfm/ft² Ventilation rate = cfm ft² = 423 cfm Latent Rate The latent load in a classroom will dominate the primary airflow sizing for a WBCS system. The change in humidity ratio will likely be 20 gr/lb or more. Such a large change will require a higher humidity level in the space and a lower humidity level from the primary unit. = P latent /(0.68*( W r W primary air )) where w primary air = the humidity ratio of primary air in gr/lb w r = the humidity ratio of the design space condition in gr/lb P latent = the latent load in Btu/h = the primary air flow in cfm = P latent /(0.68 (W r W primary air )) Latent load Platent = 7165 Btu/h w r = 71.2 gr/lb (Note: this is based on 75 F and 55% RH) w primary air = 51.6 gr/lb (Note: this is based on F leaving coil temperature) Primary air flow for latent load = 7165 / (0.68 ( ) = 538 cfm Swegon Application Guide 2

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