Help with Heat Loss

Jed_2

Merry Christmas to all, and all the best for the coming year.

I am faced with proposing a hydronic heating system for an Automobile Dealership Service Department Addition. It will feature a drive through bay for service evaluation, along with additonal rooms/offices. I have never done one of these with respect to the drive through bay. The balance of the addition is no problem. The bay will require exhaust ventilation. I'm sure that tail pipe exhaust will be provided, but, I,m told there will need to exteior wall exhaust fans as well. I do not have any data at this point about the capacity for the exhaust fans.

I guess I,m asking if anyone has had experience with this; and is there a Code or standard for exhaust CFM for this application? My thinking now is to somehow provide a radiant(slab is already poured) heat delivery, rather than fan coil or commercial baseboard. I,m looking for ideas/experience.

I will attempt to copy a floor plan of a Viso drawing I did for the addition. Ceiling height is 12'.

Jed_2

Vehicle Exhaust Ventilation

Merry Christmas to all, and all the best for the coming year.

I am faced with proposing a hydronic heating system for an Automobile Dealership Service Department Addition. It will feature a drive through bay for service evaluation, along with additonal rooms/offices. I have never done one of these with respect to the drive through bay. The balance of the addition is no problem. The bay will require exhaust ventilation. I'm sure that tail pipe exhaust will be provided, but, I,m told there will need to exteior wall exhaust fans as well. I do not have any data at this point about the capacity for the exhaust fans.

I guess I,m asking if anyone has had experience with this; and is there a Code or standard for exhaust CFM for this application? My thinking now is to somehow provide a radiant(slab is already poured) heat delivery, rather than fan coil or commercial baseboard. I,m looking for ideas/experience.

I will attempt to copy a floor plan of a Viso drawing I did for the addition. Ceiling height is 12'.

hr

A radiant slab

would be nice, but not real do-able with a slab in place. Maybe radiant ceilings or walls??

We installed 4 Clean Burn waste oil unit heaters in service bays like this last year for a Buick dealer.

They love waste oil powered equipment at dealerships. Many actually have to pay to have drain oil hauled away these days. Waste oil makes a lot of sense for repair shops like this.

They also make waste oil boilers if you can design a hydronic system somehow.

hot rod

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Jed_2

Thanks Hot Rod

In fact, they will be installing a Clean Burn waste oil boiler. Glad I don't have to service it. They want the service bay about 65°F. I just don't know what CFM value to consider in this. Any input would be welcomed.

Jed

Dave-St Louis

Car Dealership Service Area

Recent project we furnished material on was sized for 400 cfm per exhaust. This was for a Car-Mon system to remove the vehicle exhaust. Had ten (10) service bays, so we had 4000 CFM exhaust required. Used direct fired makeup air interlocked with exhaust fan, balance of heat provided by waste oil unit heaters.

Jed_2

Dave

Were these wall exhausts, or tailpipe? I don't think I need to consider tailpipe exhaust. They are also using exhaust fans from the space. That's what I',m concerned about.

Jed

Dave-St Louis

Car dealership exhaust

Jed: We had ten (10) stations of tailpipe exhaust. We also figured in 7,000 cfm for air exchange because of other exhaust. Our exhaust fan totaled 11,000 cfm and the air make up unit was 12,000 cfm. A CO detector can bring on the exhaust fan, which in turn will bring on the Air Make UP unit. OR the MUA can start the exhaust fan if space heating is needed and is not being supplied by the waste oil unit heater.

Jed_2

Thanks, Dave

I will trial run an interpolation based on your numbers, since I don't have any from the GC. Just what I was looking for.

Thanks,

Jed

Jed_2

Hot Rod

Yes, I can design a hot water system around a Clean burn waste oil boiler. Just wondering if you had any typical CFM data for exhaust(not tailpipe).

Jed