I am modeling a school building with small "unit ventilators" that have hot
water and chilled water coils, (i'm modeling as fan coil units in equest).
My problem is that these units have a small ERV and equest doesn't allow fan
coils to have them. If anyone has a bright solution or tips that would be
great.
my plan as of now is to create a dummy system that will feed OA to the fan
coil units and put the ERV on this dummy system.
Thanks,
--
Rob Hudson
Rob,
A DOAS won?t necessarily solve your problem because, while an ERV can be specified, it will only see the return air of its dummy zone. You want to assign the ERV directly to the ?real? zones? parent systems so that the correct return air is simulated.
You may want to try system types ?multi-zone? or ?variable air volume? and see which one you can tweak to match the fan coils. You can assign one zone per system and get past the multi-zone part, and you can adjust your minimum flow ratio if the fan coils are constant volume. The biggest problem I see is making sure you?re not cooling and reheating; VAV won?t allow you to disable zone hot water coils. If the fan coils are variable temp, maybe see if you can give yourself a wide berth on the cold deck leaving temp (possibly using a supply air reset schedule).
Thanks,
DAKOTA KELLEY
Personally, I would model Unit Ventilators as SZRH systems with hot
and chilled water coils, fan power as per the Unit Ventilator shop
drawings. Then you can specify the heat recovery type and effectiveness.
Chris Jones
Rob,
Is your OA being provided at constant or variable volume?
Carol
Constant Volume OA