Hi there,
I would appreciate any help.
I am designing an air-conditioning system for hospital operating room. The supply air must be completely fresh air with design ambient temp of 42°C. Room design temp is 17°C to 22°C with 45 to 55% relative humidity.
My questions are :
1- The air conditioning system should be direct expansion or cold water system for better control purposes?
2- What is the best control system? The room thermostat should control the water flow regulating valve or …? NOTE that because of required minimum of air change in the room, the fan must supply minimum quantity of air. i.e., the fan can not be switched off.

Anybody having experience in this field please share.
Thanks.
Cheers