Conditioning Room Environment

Howdy, we are currently using a company LUWA (formally Environmental Specialities)to do the calibration on our Stability chambers. The controllers that are being used are: West 6100N temp controller/West 6100N RH controller/ Vaisala RH transmitter. The 6100's have a fuzzy logic ability so the can be tuned to your needs. we are also monitoring this via our Ethernet , I am the Equipment Validation Specialist for our facility so that is one thing I have to keep a close eye on. WWW.luwausa.com perhaps just contact these guys for questions, I am sure they can be helpful. And I will do what I can!

I suppose you're faced not a control problem but lack of physical capacity (power) the facility. Both heater and compressor can't deliver sufficient power to cope with changed climate conditions.

You can manage yourself to install additional entrance door and use better insulating materials for windows and walls. Either you need to replace your system with more powerful. It does no matter what its program logic.

There was only my supposition.

Good luck.

From your post you have 4 issues to address in addition to conventional "air conditioning" which in it self is not easy in an industrial setting.You must first do a load calculation to ensure you have the correct equipment for the space (BTU and CFM). Don't try to cheap out or you'll fall on your face! The Supply, Return, Filtration, De-humidification and if required Humidification systems must be designed AND installed correctly. NOTE: This almost never happens.

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• Maintaining an equal environment in all areas of a conditioning room.

Move/mix the air constantly to prevent stratification, think of the air as if it's water. (The supply ducts must have been sized & placed correctly for this to work correctly)

• Requirement is Temp. 21 +1 & RH 65 + 3.

An experienced HVAC&R designer can handle this without much trouble. Typically you use a properly sized air conditioner that has HEAT, COOL and DEHUMIDIFY modes.

(To dehumidify you simply run heat and cool at the same time)

The next 2 issues are a little harder but having auxiliary systems (EXAMPLE: space heaters and window units) OR grossly over-sized equipment has worked for me in the past. The most important thing is to have POSITIVE AIR PRESSURE in your space! This is acheived by sucking in outside air which is prefiltered and air conditioned as needed You can use a double door "interlock" setup to help maintain the positive air pressure.

(that's an outer door, very small hallway and inner door) the idea is both doors should never be open at the same time

• Winter season when out side temperature goes down to -C

• Monsoon season when humidity is too high

Again good HVAC&R company can make this happen a with rather simple control system that you set and forget. Inspect and do preventive maintenance on regularly on the system and it should give you 10 to 15 years of service.