Hello,
I have one, I think fairly simple questions about eQUEST.
1. My simulation shows quite a bit of energy used by ventilation fans but it
is for a simulation of a house that does not have ventilation fans. Where
can I tell eQUEST there are no ventilation fans? I do actually have an heat
recovery ventilation system but it runs for about only 2 hours each day.
Does eQUEST have the ability to simulate that also?
James Mathias, Ph.D., P.E.
James,
What is your system selection? Also - could you attach your inp file?
Vikram Sami
Ok here goes - copying the group in case anyone else has better feedback
At first glance here's a couple of impression. I don't do too many single family homes, so my mental validation might be off.
* The fan load is high compared to everything else. Partly because everything else is really low. Your annual EUI is 13.2 KBTU/ft2-yr - that's very low - even for a house. This makes sense with a GSHP.
* 1" static pressure on your fans might be high for a residential terminal unit that's not ducted.
* PVVT might not be the best system choice to go with a ground loop - try a water loop heat pump. You will still have fan energy, but with a terminal unit (as opposed to a ducted one) you should see that go down.
* The heat recovery system for the ventilator is a more complex matter that will require you to go well beyond the SD wizard. You will need to model a DOAS with energy recovery.
Vikram Sami
Vikram:
FYI; Jeff Hirsh responded to a question that I posed and stated that eQuest does not support an OA-from systems with an ERV.? While I find it possible to add one, the airflow and recovery through the ERV do not make sense.
Have you found a work-around?
?
Paul Diglio
He is correct. The workaround is to introduce a phantom load in the dummy zone.
Another way that seems more straightforward (I haven?t used it yet, but I will on the next one) is to preheat the exhaust and specify the exhaust air temp in the dummy zone.
Vikram Sami