[Bldg-sim] DX Cooling EIR Ratio Curve

[Jonathan Curtin]

Shaojie,
 
I believe you should be concerned with the wetbulb temp of the mixed air
entering the coil (unless you are 100% OA). If I remember correctly, I
went through the same analysis once. It becomes a little difficult
because I don't believe the mixed air wetbulb is a variable that you'll
find available in the hourly reports. But if you do the manual
calculation things should start to come together.
 
Good luck,
 
  Jonathan M. Curtin, EIT, LEED(r) AP
  Mechanical Engineer

  


________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of eric wang
Sent: Friday, February 13, 2009 12:48 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] DX Cooling EIR Ratio Curve


Hi,
 
I used the default DX Cooling EIR Ratio Curve (DX-Cool-Cap-fEWB&OAT) in
eQUEST. The variables are t entering wetbulb and t enter condenser. I
assume these refer to outside air wet and dry bulb temperatures. After
exporting outside air wet and dry bulb temperatures in hourly report,
the value of "Temp correction to COOLING-EIR" I calculated is different
to the one in the hourly report by using the curve coefficients. Can
anyone point out if my understanding is correct?
 
Thanks a lot for your help
 
Shaojie


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