Calculating Chilled Water Pump Head

It's the sum of

the static system delivery pressure, +

the dynamic system pressure, -

the static system supply pressure

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(answer)

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for hydronic applications, we can say that:

1. For closed systems: Pump head = the sum of all friction pressure drops Where: Friction pressure drop = piping pressure drop + terminal unit pressure drop + source unit pressure drop* + valve pressure drop + accessories pressure drop.
2. For open systems: Pump head = the sum of all friction losses plus the static lift of the fluid plus the pressure head.

* The "source unit" is defined as the boiler, chiller, or heat exchanger, which creates the hot or chilled water.

Total Head = Suction Head + Delivery Head + friction loss in suction pipe + friction loss in delivery pipe + friction loss in fittings + (velocity head in delivery pipe/9.81)

all dimensions in mtrs.

Suction head = height from bottom of suction pipe to centre of pump inlet

Delivery head = height from centre of pump outlet to the delivery point

friction loss in suction pipe = approx 0.21kgs/sq.cm per 30mtrs

friction loss in delivery pipe = .07kgs/sqcm per 30mtrs.