At times, you may have overtime requests in excess of 'minimum load.' The calculation considers this and includes 'minimum load' and 'other load. Minimum load for W.C.U.s 300 Tons and smaller is at your discretion, but is assumed not to be over 30 of full load. Minimum load for Water Chilling Units over 300 Tons will be 30 of full load.

The ARP Forum will become Pro Member only on September 1, 2020. This notice is dismissible, click the top right X and it will vanish. Now, if you can remember anything from this article, let it be this: The tonnage.A quick announcement here. Use the following conversion information to determine your existing system size (use the system model number NOT the serial number) 18 1.5 tons 24 2 tons 30 2.5 tons 36 3 tons 42 3.5 tons 48 4 tons 60 5 tonsAir Conditioning Tonnage Calculation - Air Conditioner Drain Pans Air Conditioning Tonnage Calculation air conditioning A system for controlling the humidity, ventilation, and temperature in a building or vehicle, typically to maintain a cool atmosphere in warm conditions air conditioner: a system that keeps air cool and dry (Air-conditioned) buses fares cost a little overThis cooling power or cooling capacity is measured between 1.5 and 5.0 tons.

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Next you need to know the design specifications for the chiller. Make sure the taps where you measure the water pressure are at the same height or adjust for the difference in height. I use a Fluke 87 with a pressure transducer to measure the water pressure into and out of the chiller. Most chillers today have sensors that are accurate within =/-. Of course the accuracy of the sensors and the meter used to measure flow will have an affect on the results, but it can be calculated. A chiller with a constant volume which the OP has since it's a primary/secondary loop, pumping can be calculated.

If memory serves me it is Actual GPM = Design GPM x the cube root of the actual pressure drop divided by the design pressure drop. If your actual pressure drop is different than design, then there is a formula you need to apply to determine actual flow. The part that you need to find out is what the pressure drop through the evaporator is at design. For example, if the chiller has a flow rate of 550 GPM and the Delta T is 4.8гЂ«F, then the tonnage would be 110 Tons. Tonnage is calculated as follows: GPM x в€† Tпё’ Г· 24.

Tons = GPM x Delta T of the water x Specific heat x Specific gravity / 24 147.08 FPM x 1.5 Gal Per Ft = 220.62 GPM 200.62 gal x 60 min x 10.6 delta T = 1,169800 BTUH Tons = GPM x 60 x 8.337 x Delta Temp of water / 12,000 BTU per ton Total Pressure -pressure = Velocity pressureFind the tons of a chiller above example with entering water of 58.8 Deg and leaving water of 45.2 Deg I'll check it tomorrow morning.I.e.: 30.0 inches and specific gravity of 0.90 the fluid pressure transmitter will be 30.0 inches.(rise) x 0.90 (specific gravity) = 27.0 inches of H2OFind GPM of 6' pipe Sch 40 with a pressure of 42.45 and a total pressure of 42.7

Calculate rise across the pump by subtracting the suction pressure from the discharge pressure. Measure the pressure on the suction and discharge sides of the pump ( dif head pressure)6. The suction valve should always be fully open when the pump is in normal operation.5. Verify the suction valves is open. Close the discharge valve. This is shown as (3)In order to determine the amount of flow in the system using the pump, the impeller size must be verified.3.

I was thinking about the thread yesterday and I learned that the next time I will ask what the purpose of the information is. I worked for Trane for 16 out of 26 years doing mostly chillers, centrifugal and screw, then moved into controls Now I own my own company and a lot of times I get to figure out weather the controls or the chiller is the problem on systems that don't perform as designed. My sole purpose here is to try and help people when I can and get help if needed.

Does that mean that we are looking for tonnage from the chiller with in its primary loop, or are we talking about tonnage of chilled water in the secondary loop.It would be my opinion that the secondary loop is the most important whereas this is where the work or power is required. The beauty of it all is, like most of us - I don't have to dig for it.Trouble shooting is not part of the repair.understand the symptoms and you will find a solution.As far as calculating the actual tonnage this is left to interpretation. Which is why I have this information and much more at my finger tips. However each of us must know the criteria and apply this knowledge so as to be effective with out wasting time or resources.Like the most of us here, I am also just a mechanic and also have to decide for myself what is the best way to figure something out. Just like a specialty tool, it has its specific function.There is always another way and not one answer is always correct.

In area and under a pressure of 25 Psi has force of 250 Lbs.The unit of mechanical work is the Horsepower.One HP is the equivalent of 33,000 Foot pounds of work per minute.If a 2000-lb. It will be necessary to average out the consumption of chilled water over a 24 hr period and base a final number on this average.A Piston 10 Sq. It will be difficult to make any estimates for actual tonnage due to the fact that this is a variable load. However it needs to be considered - the off time of the chiller when satisfied or when at part load.

Tonnage Calculation Hvac