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Chiller curve and AHRI test condition.

asked 2018-07-25 06:58:22 -0600

Siv gravatar image

updated 2018-09-27 07:46:41 -0600

Hi

It looks like the IPLV calculated for my chiller is not at AHRI test conditions,

image description

The error reads

** Warning ** Chiller:Electric:EIR = CHILLER ELECTRIC EIR 1:  Integrated Part Load Value (IPLV) calculated is not at the AHRI test condition.
   **   ~~~   **  Check limits in Cooling Capacity Function of Temperature Curve, Curve Type = BIQUADRATIC, Curve Name = CURVE BIQUADRATIC 47
   **   ~~~   **  Check limits in EIR Function of Temperature Curve, Curve Type = BIQUADRATIC, Curve Name = CURVE BIQUADRATIC 48

Is there a work around for this issue or should I change my chiller ?

TABLE 3

image description

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answered 2018-07-25 09:36:16 -0600

updated 2018-07-25 09:36:46 -0600

This is just a warning to tell you that the min/max values for X/Y variables exceeds the limits defined from AHRI 551/591,2011 Table3. These limits are defined in StandardRatings.cc#L704:L70. You'll see in the next 80 lines after that, that all it does is to compare your Curve Min/Max X/Y with these values (and depending whether your chiller is air cooled or water cooled).

So double check these limits are whether your curve as a whole is appropriate and if so, then ignore the warning.

A common cause for this warning may be that you use an Aircooled curve for a Watercooled chiller or vice versa... Not sure what your chiller is supposed to be here.

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My chiller is a water cooled chiller. I changed the Xmin, Xmax to 7, Ymin and Ymax values to 19 and 30 but still the error persists. I checked the AHRI 551/591 it gives those values. I have attached a picture of that table 3 above. Could you please help me regarding this issue ?

Siv gravatar imageSiv ( 2018-09-27 07:46:04 -0600 )edit

Xmin and Xmax shouldn't be both 7. Read the description here. "The biquadratic curve should be valid for the range of water temperatures anticipated for the simulation"

Julien Marrec gravatar imageJulien Marrec ( 2018-10-02 02:32:28 -0600 )edit

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Asked: 2018-07-25 06:58:22 -0600

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Last updated: Sep 27