[Equest-users] air flow sizing

[Uday Gorre]

Hi Tiwari,

As per my knowledge there is no separate Cfm calculation for Latent load,
Latent load accounts in cooling capacity of AHU only(BY coil surface
temperature)i.e dehumidification takes place at coil itself.

Simply CFM calculated based on room sensible heat gain.

Uday....


 
-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of sambhav
tiwari
Sent: 12 June 2012 11:08 AM
To: equest-users
Subject: [Equest-users] air flow sizing

Hi All,
          The cfm for zone is sized based on room and supply air temperature
deltaT and room sensible heat load  ie
cfm=RSHL(btu/hr)/(1.08XdeltaTinF)

similarly the cfm for the latent load is
cfm=RLHL(btu/hr)/(4840XdeltaW) Where deltaW is Ws-Wr  ,Ws is humidity
ratio lb of water/lb of dry air   of supply air at 55F and Wr is room
design humidity and RLHL is latent load in btu/hr

the total cfm should be sum of both due to deltaT and deltaW

But equest takes only due too sensible load because there is no where option
to input supply air humidity and room design humidity then how it takes in
account of cfm due to deltaW?

Thanks
Sambhav
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