locker room hvac

[roned]

I'm new here. I have a single zone men's locker room for industrial plant, 200 people +/-, plus showers, toilets and urinals. I'd like to use 100% outdoor air a/c unit with modulating hot gas by pass and energy recovery wheel. I want to select the preferred room temperature control system. I believe air recirculation is not allowed per Building codes. I believe single zone variable volume control (to provide minimum required outside air is way to go with room temperature reset. Any comments?

 

[willard3]

Occupancy is going to dictate how much air you supply/exhaust. VAV is a poor choice for this with thermostat control.

 

[trashcanman]

Forget about VAV control. Calculate the cfm per the load. That will be the cfm, constant volume, 100% outside air. The cooling/heating coil will be controlled by the space thermostat. Be sure to tie the exhaust fan(s) to the makeup air unit.

 

[dbill74]

"Believing" air circulation is not allowed per Building code tells me you are young and not familiar with building codes. Something you need to rectify ASAP if you are going to be working on HVAC systems on a regular basis.

You are correct, air from a toilet or shower room cannot be returned to an AHU and circulated back into the building. However, this does NOT mean you need 100% outside air. IMC and ASHRAE 62.1 will guide you in determining an adequate amount of EA to provide (Note: NOT SA or OA). Hint, it's not based just on the number of people.

Lastly, for a toilet/locker room, and they way codes are written, it is more important to maintain a minimum EA rate than SA/OA rate.

 

[roned]

Locker room area will contribute to the required outside air requirement also, but it also cannot be recirculated per the building code. Only other building area is a relatively small entry area, so I don't have much supply of transfer air. That's why I said 100% outside air. I forgot to mention the air handler will be a package DX unit capable of handling 100% outside air, including modulating natural gas heating.

 

[chicopee]

I suppose that you have your design parameters for ambient and indoor temperature and relative humidity set. Being 100% make up air, how is the exhaust air dissipated to the outside?

 

[chicopee]

I should also mention that you should have estimated the sensible heat and latent heat loads generated within the locker room in order to size the cooling capacity of the A/C unit. Steam release from showers will be a tough one to estimate however do a web search or get a copy of ASHRAE from your library for guidelines.

 

[roned]

Exhaust air will be pulled thru the energy recovery wheel of the packaged unit by it's exhaust fan. Design parameters have been set and heat loads estimated.