[Equest-users] Heat Pump Chiller - Anyone know the Rating Conditions

[Chris Hadlock]

Hi Bill,

Thank you for your detailed reply - I am running DOE2.2. I will see if I
can find the Eurovent rating conditions - thanks so much for the help!

Chris

On Wed, May 20, 2026 at 6:51 PM Bill Bishop <William.J.Bishop at imegcorp.com>
wrote:

> Hi Chris,
>
>
>
> Are you running DOE2.2 or DOE2.3?
>
>
>
> Looking through the DOE2.2 Vol2 Dictionary, there is a note that, “the
> performance curves are normalized at the Eurovent rating conditions, rather
> than ARI.” For HEAT-EIR-FT, “this curve should be normalized to 1.0 at the
> ARI or Eurovent rating point” but I don’t know what temp that is (or was,
> in 2009).
>
>
>
> With DOE2.3, HEAT-EIR-FT, “the value of the curve is usually normalized to
> 1.0 at rated conditions, but this is not mandatory; the program will
> normalize the curve internally”.
>
> In DOE2.3 mode, the default value for RATED-COND-T-HT is 45F based on the
> default expression for an air-cooled condenser. The default for RATED-HW-T
> is 110F.
>
> You can experiment by creating a custom hourly report block with variable
> type Chiller that reports leaving supply temperature, entering condenser
> temperature and correction to heat-input-ration for temperature.
>
>
>
> Regards,
>
> ~Bill
>
>
>
> *William Bishop*, PE, CEM, LEED AP, ASHRAE (BEMP, BEAP, CDP)
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>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Chris Hadlock via Equest-users
> *Sent:* Wednesday, May 20, 2026 10:20 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Heat Pump Chiller - Anyone know the Rating
> Conditions
>
>
>
> *External Email: *Treat links and attachments with caution.
>
> Hi All,
>
>
>
> I'm modeling a "heat pump" type chiller (air-cooled) and I'm trying to
> figure out the dependent variables about which the default curves are
> normalized so that I can create my own curves. Below is the screen-shot for
> my heat pump Performance Curves.
>
> For example, the heating EIR curve that is a function of evap leaving T
> (SWT) & cond entering T (OAT): does anyone know the leaving water
> temperature and entering air temperature at which point this curve is
> normalized (i.e. returns an EIR value of 1.000)? I used goal seek for
> various combination of temperatures and here are some options (yellow cell
> was calculated using GOAL-SEEK ):
>
>
>
> SWT ->
>
> 120
>
> 115
>
> 115.6816
>
> 105
>
> 112.2388
>
> OAT ->
>
> 54.36586
>
> 61.10728
>
> 47
>
> 39.21
>
> 44
>
> Goal Seek set to 1.000 ->
>
> 1.003649
>
> 0.999675
>
> 0.99995
>
> 1
>
> 0.999975
>
>
>
> Based on these results, it's looking like perhaps 115F SWT and 47F OAT
> might be correct...but wanted to confirm.
>
>
>
> Since there is a second heating EIR curve for OAT < 39F, does anyone know
> the leaving water temperature and entering air temperature at which point
> this curve is normalized?
>
>
>
> Thanks,
>
> Chris
>
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