4/26/2021 0 Comments Cooling Tower Capacity Calculation
Unlike other methods, Instrumental drives correlations between a variety of data sources to help engineers find and fix root causes.I would like to calculate our current cooling load (heat load).Temp in is 85DegF Temp out is 74DegF Flow is 2800GPM.through a 10 inch pipe ( I dont think U need this info though.I would like to know the BTUs or whould it have to be BTUs per minute I know 1 BTU is the amount of heat to raise the temp of 1 pound of water by 1 degF.
This is a simplified number as a portion of the incoming water evaporates to provide the cooling but it will give you a close number for your cooling load. About 15.4 MMBTUhr is my rough estimate. The above figure is equal to 1289.57 TR (1TR 12000BTUHR) This tower is a pretty big one. I have been looking at the pump curves and now realize that one of the pumps is operating way out of its design conditions. It is operating way up on the pump curve and is therefore not moving as much water as first thought. I measure the actual pump head (psi x2.31 ft head). I go to the pump curve and move right across the graph until I hit the appropriate curve. Unless this is a variable speed pump, there is only one curve that applies to your pump. If the info you have shows multiple curves, you are probably looking at different curves for different impeller diameters. Look at your pump nameplate to get the impeller diameter for your pump, and this will lead you to the right curve. Also, you want to measure the head developed by the pump, so to be accurate, you need to take a pressure reading at the pump suction as well as the pump discharge. The head difference between the two will be the head developed by the pump. KenRad. The pump curve should be accurate for the range shown by the vendor. Cooling Tower Capacity Calculation Portable Ultrasonic MeterOn one pump I remember, I was out more than 20 on flow from the curve versus what I got with a portable ultrasonic meter (trying to remember the exact numbers, might have been higher). When I talked to the rotating equipment engineer, he wasnt surprised at the difference given where the pump was operating (and he wasnt happy with its operating point). You can not pick out a pump without knowing the operating point. Since the operating point defines the system head and system flow rate, can we be sure the pump is even sized properly Or maybe I am not thinking straight. If youve got inlet piping exactly like his test loop you may not have to run a baseline performance test in your loop to determine your facilitys pump head-flow, power, current, etc. If youre playing for high stakes, dont bet capriciously that your pump facility will be hydrodynamically identical to the manufacturers test loop. RETEST THE PUMP IN YOUR LOOP If you havent done this then you may be miles off using the manufacturers curves. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. The Eng-Tips staff will check this out and take appropriate action.
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