[Equest-users] Daikin heat pump curves

[Julien Marrec]

Hi,

I've been trying to model a Daikin VRV system and trying to figure out why
I was getting 100 times more space heating in the proposed (VRV) model
compared to the baseline model (PTHP). After isolating the problem to the
VRV, I found a conversation from March 2014 between a few folks (Byron
Burns and Bill Bishop mostly - thank you both!), that basically explained
why I was getting the issue: the .inp data from Daikin isn't importing
correctly.

I just wanted to say that we're in July now, and this still hasn't been
fixed (I downloaded the curve from Daikin a few days ago), so if you're
having the problem, the fix proposed by Byron and Bill still works. It
consists in to replacing the VRV Heating Curve with:

"VRV Heating EIR-F-EWB/ODB AC" = CURVE-FIT
   TYPE             = BI-QUADRATIC-T
   INPUT-TYPE       = COEFFICIENTS
   COEFFICIENTS     = ( -1.85025, 0.0620141, -0.000312822, 0.07145853,
         -0.0003626328, -0.0007776424 )
   ..

(at least that's how I understood it and it seems to be working).

I've attached the performance curves with repaired Heating EIR for VRV.

I'll email Daikin to let them know (again), maybe others will want to do
the same so that they realize this is a problem encountered by more than
one individual


Have a great day,
Julien
--
Julien Marrec, EBCP, BPI MFBA
Energy&Sustainability Engineer
T: +33 6 95 14 42 13

LinkedIn (en) : www.linkedin.com/in/julienmarrec
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