Hi,
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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?
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Thanks a lot for your help
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Shaojie
DX Cooling EIR Ratio Curve
Feb 13, 2009
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
Jonathan and Glenn,
?
Thanks a lot?for your replies. However, the values I calculated by using return or mixing air wet bulb temperatures are still different to the number listed in the hourly report.
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Thanks
?
Shaojie
Jeff,
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The system type is DX packaged single zone. From the hourly report, I found sometimes Temp correction to COOLING-EIR, Part load correction to COOLING-EIR and Operating EIR are zero when Cool on/off flag is on. Is there a specific condition?that?these parameters?can equal zero?
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Thanks a lot
?
Shaojie