[BLDG-SIM] eQuest 100% OSA & Heat Recovery with System Type PZRH & SZRH Only?

[Brandon Nichols]

Hello All,

In simulating a 100% outside air heat recovery system with multistage DX cooling and supply air reset capability (40,000 CFM x2 units, in my mind a couple of big PVVTs), it was most time-consuming to learn by trial-and-error that heat recovery does not seem to work as expected for certain types of systems.  For the PVVT, PVAV, and VAV system types the baseline system would always outperform the heat recovery system, despite numerous iterations of parameter tweaking, and even if 'extreme measures' such as high internal heat loads were applied to force a large delta-T.

However when I at last selected a packaged or single zone reheat (PZRH or SZRH, after getting a clue from the BLDG-SIM archives)... Voilà!,  reasonable results are instantly obtained.

My question is... do we need to stick to a list of simple systems when simulating heat recovery, regardless of whether its a 100% outside air system?  If so, does anyone have a list? So far, my list consists of just PZRH and SZRH, which seems a bit limiting.

Any empirical or quantitative insight into the mysterious inner workings of eQuest that would account for these observations much appreciated...


Regards

Brandon Nichols, PE
Mechanical
HARGIS ENGINEERS
600 Stewart St
Suite 1000
Seattle, WA 98101
d | 206.436.0400 c | 206.228.8707
o | 206.448.3376 f | 206.448.4450
www.hargis.biz

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