Ductless splits in Gymnasium
Ductless splits in Gymnasium
(OP)
I was looking at a school gymnasium which currently has an air handler w/hot water coil serving the gym. The existing duct is sized to handle about 5000 cfm.
The supply duct is located above the ceiling with ceiling diffusers. The return drops down to the floor level.
The cooling load for the space is approximately 22 tons at 8400 cfm.
I was thinking of replacing the existing air handler with a new Trane climate changer (existing AHU is from 1959) w/hot water and dx coil. There would be a 12.5 ton condenser located on the roof.
Could the remaining load be handled by a few ceiling mounted ductless splits. The ceiling is 20 ft. high. I'm only thinking ceiling mounted as opposed to wall so i don't have to worry about the occasional stray basketball.
I was thinking the low returns would help pull the ductless air to the floor level.
The supply duct is located above the ceiling with ceiling diffusers. The return drops down to the floor level.
The cooling load for the space is approximately 22 tons at 8400 cfm.
I was thinking of replacing the existing air handler with a new Trane climate changer (existing AHU is from 1959) w/hot water and dx coil. There would be a 12.5 ton condenser located on the roof.
Could the remaining load be handled by a few ceiling mounted ductless splits. The ceiling is 20 ft. high. I'm only thinking ceiling mounted as opposed to wall so i don't have to worry about the occasional stray basketball.
I was thinking the low returns would help pull the ductless air to the floor level.





RE: Ductless splits in Gymnasium
RE: Ductless splits in Gymnasium
RE: Ductless splits in Gymnasium
Latent loads are high in gymnasia.
The pressure drop and velocity may be unacceptably high using the same ductwork for the air handler with increased volume..
Perhaps, rather than taking professional risk, you should tell the owner he can't afford to do this with the current budget. Nobody will thank you if it works poorly.
RE: Ductless splits in Gymnasium
If you can mount a condenser unit on the roof, why not two 10 or 12ton package units?
Displacement ventilating pommel horse?
RE: Ductless splits in Gymnasium
Possible to reduce the cooling load? White roof, better lighting, better glazing, more insulation?
What is your design wetbulb? Evaporative cooling is cheap (when it is appropriate).
Probably the easiest would be to add a 12 ton RTU.