Kindly let me know what pump I should use for a chilled water close loop system where required flow rate is 102 m3/hr and the max. hight of building is 100 ft.

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Originally Posted by knadeem123

kindly let me know what pump i should use for a chilled water close loop system where required flow rate is 102 m3/hr and the max. hight of building is 100 ft.

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You have 100ft height... what about your friction loss, fittings, horizontal run, coil?. it best that you talk to the person who will sell you the pump, this person should have a pump flow chart... remember you will try to buy a pump a little bigger than what you need now

On a closed system the building height has nothing to do with the pump flow. The height up equals the height down so they cancel each other out. The pressure (friction) loss of all the pipe, fittings and components in feet of water are added up. With the presuure loss, or what is commanly called head loss, in feet of water and the flow requirements a pump can be selected.

Dave Brown

The pump salesman is not likely to be able to tell you what size of pump to buy.

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Originally Posted by caibuadday

you will try to buy a pump a little bigger than what you need now

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Oversizing pumps is a HUGE waste of money. Buy one the right size, and if your demand changes, buy another one. The money you save in energy and maintenance will justify it.

Peerless Pump of Indianapolis, IN, makes the best general sizing guide I know of. It's called "System Analysis for Pumping Equipment Selection," brochure B-4003. If the technical language is over your head, call a consulting engineer to size your pump.

I have room size sqm, How many capacitor load for use

[QUOTE=knadeem123]kindly let me know what pump I should use for a chilled water close loop system where required flow rate is 102 m3/hr and the max. hight of building is 100 ft.[/QUOT
Kindly let me know what types of centrifugal pumps using for HVAC

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Originally Posted by Tingineer

On a closed system the building height has nothing to do with the pump flow. The height up equals the height down so they cancel each other out. The pressure (friction) loss of all the pipe, fittings and components in feet of water are added up. With the presuure loss, or what is commanly called head loss, in feet of water and the flow requirements a pump can be selected.

Dave Brown

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mr.brown what should we understand when you say the height up equals the height down.I have got a 40 meter high building where I plan to place chilled water pumps on roof top.its a 6 storey hospital and risers would run down up to ground floor.equivalent length of pipe comes out around 350 meter.can you share your experience regarding selection of pumps in this case.dont have to be that precise, just a rough idea for a 350 GPM load.Thanks

100 feet is the height of the building so the standing pressure is very less. The standing head is to be calculated for determining the pressure rating of the pump casing and accordingly the material of construction also change based on the pressure, however this is necessary only when your total standing head crosses 20 bar, wgereas in your case it is only 3 bars.
You can go for a ordinary MONOBLOC pump with TEFC motor and Cast iron pump casing. You have to calculate the Friction drop in the pipe line and fittings. Refer the carrier hand book for piping design
or
select the longest path and calculate the friction loss for all the chilled water pipes in the scale of 2 - 2.5 ft / 100 ft of pipe length. Sum up the entire length and multiply with the above value and multiply the final result by 1.4 - 1.5 to cover the friction loss in all the fittings and equpments.
Trust it clarifies

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Originally Posted by Sothearoat

I have room size sqm, How many capacitor load for use

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:eek::eek::cool::D:o:rolleyes:

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