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

[Chris Hadlock]

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.
[image: image.png]
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20260520/fd30d318/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 32144 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20260520/fd30d318/attachment.png>