well put lil but that brings me to a question though. Alot of Test and balance will set minimum requirement for the osa dampers. Why not just put a CO2 sensor in the return duct therfore the dampers wont be set on a minimum basis? I dont know if he has a current control system on the unit but...
I have a room that holds about 10 pumps of all sizes, 3 chillers (2 centrifugal (R-123) , 1 Screw (R -134a), A HX, 6 VFD drives and A MCC in the central plant. When you design for a shut down or panic button is the intent on shutting down the Chillers themselves or is the intent on shutting...
the motor sounds bad ............sounds like the bearings are goig on it. The motor under no load has little amp draw. Can you try and rotate the motor with ease with your hand ?
Forgot about the hardwood floor question. Temp and humididty is critical when it is first installed so the wood does not expand or contract when it is installled on the ground. But soon after they do a seal on the floor some kind of laquer or sealant and once the floor is sealed you wont have to...
Let's take a class on psychometrics 101 ..........The psych chart as i call it would be usefull tool to understanding in what operating temps you will be in. It will also tell you how much humidity you want to have before it becomes uncomfortable. Remember designing is about human comfort so if...
i recently had a problem with frozen coils that broke when we had an unusual nights here in Fl. Alot can contribute to the coil failures such as ex fans running all the time creates pressure differences therefore depending on how well its sealed (the building that is) it will suck in the cold...
As far as using wet bulb for a demand control i would agree with you. Really the wet bulb control is a signal that lets us know that conditions are ideal outside. Usually there are very few cooling demands when you are in a plate and frame mode.Therefore we can run the CHW water temp a little...
Well i hope i can answer a few of your questions here.As far as HX mode most control companies base there start off of outside wb. The sequence for the control is to find the more efficient way for energy savings. So if cooling demand is needed in the bldg the operation is to compare the outside...
I think it depends on the type of CO2 sensor you buy. The only one I trust and are familiar to are from Veris Industries. They have a 5 year warranty and they self calibrate themselves. Here is a link you can check out there eng specs and manual...
