Load Estimation

Sound like a Trane water package. Remember it most likely set up to run at 5.5°C TD across the chiller. When the load gets too large, the chiller will try to maintain it but due to the same flow at higher temp it will change a bit. Thus if set point is 5.5°C at 10.5°C in then = 5°C out water but if the load exceeds the chiller Design Cap at a specific flow e.g water will come in at 15°C, it will go back 12°C, thus the bad circle of circumstances starts.

Start at the beginning - do the Heat Calc's, the flow rates and balancing the pipe network, then the pumps that feed them = then balance all up to the chillers used, then you can see if you are in check or not.

Just done an anylysis on ammonia system - losses due to bad previous design, open chilled water ponds at 0.5°C at atmosphere temps of 35 -40°C, client just extending pipes, saving on piping material thickness etc = losing 25 -35% spray cooler capacity under various circumstances. Then there is the fact of cavitation where that bubble can burst up to temps of 1000K - excluding the effect of mechanics, the loss in kW-r is quite alot. Measured at on stage the pumps - losing 2°C over the inlet to outlet of pump alone, at 4 x pumps at 150cub/hr, - make a simple calc of mCp(dt) and you have an idea of what stupid dumb idiot farmers and winemaker people are doiing to themselves! Taking something that looks like a pump from the scrap heap and just fit it ! Saving $1 is wasting $1000's. Why - people do not want to use engineers - cost to much but this scenario is costing these guys in $ = 15000 in energy costs alone.

Being an idiot is not by accident, to be pardoned for it, another idiot in the making.

For chilled water the formula is Tons=GPM*DT/24.

You should be able to get your GPM close enough off of your pump or chiller specifications.