[Equest-users] Toilet Exhaust Allocation

[Steve Jacobs]

I know fan energy has been talked about before but I can't find the 
exact answer to my question.

What do you guys find is the best way to deal with point source exhaust. 
Especially when it is going to be running intermittently, and not 
necessarily associated with main equipment.

1. A simple example is an apartment unit with a fan coil and then 
kitchen and bathroom exhaust that will run intermittently. Do you feel 
that you need to take the 0.3 W/cfm and distribute it between the supply 
and exhaust? Then schedule the exhaust to run explicitly for 2 hours (or 
whatever time) per day.

If the fans are not being required to supply the ventilation air. I feel 
like the easiest approach would be to model the exhaust fan as a direct 
load on the electric meter in the proposed case. And leave the baseline 
supply at 0.3 w/cfm.

Or is there any case to be made that you could consider either the 
bathroom or kitchen exhaust a process load and model it the same in the 
baseline and proposed (in addition to the 0.3 W/cfm).

2. A more complicated example would be a school. Where you have some 
continuous exhaust systems for pressurization. You can also have makeup 
exhaust for the kitchen. And intermittent exhaust for the labs.

Do you feel you need to model these all explicitly? Also, is it 
necessary to include all of the fan power from the exhaust as part of 
your appendix G allowance based on supply flow rate, then distribute it 
based the ratio of exhaust, return and supply. Again, I feel it is 
easiest to take some of the smaller exhaust systems and model them 
directly on the electric meter. I also feel large, intermittently 
running exhaust systems will distort the fan power allocation in the 
baseline.

I would appreciate hearing how the community deals with these issues.

Thanks,
Steve