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Re: [EnergyPlus_Support] Direct Evaporative Cooler - documentation



Ooi,

If you are considering a direct evaporative cooler:
  •  outdoor air is the only airstream and the leaving air temperature is as shown in the I/O reference (v9.0.1)


If you are considering an INdirect evaporative cooler (which seems to be the case):
  • the Engineering Reference is correct (shown below). I did not find a formula in the I/O Reference.

The effectiveness is always a fraction of the difference between the primary air's dry bulb and wet bulb temperatures. That product (eff x delta T) becomes the delta T of the secondary airstream.

James V Dirkes II, PE, BEMP, BCxP
Team Lead - Building Performance
616 450 8653
Foresight Management

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From: EnergyPlus_Support@xxxxxxxxxxxxxxx <EnergyPlus_Support@xxxxxxxxxxxxxxx> on behalf of Ooi Koon Beng ooi_kb3@xxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Saturday, July 6, 2019 9:05 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx; energyPlus energyPlus
Subject: [EnergyPlus_Support] Direct Evaporative Cooler - documentation
 
 

Dear all, 

In the EngineeringReference, the formula for the saturation efficiency 
does not seem to be correct
The InputOutputReference says that the Todb and Towb should be Tidb and Tiwb respectively

best regards
ooi




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Posted by: Jim Dirkes <Jim@xxxxxxxxx>


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