Dear Sir/Madam,

I want to know the chiller pipe pump head caculation for closed system?

Quote:

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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. -- Source

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You will also find detailed instructions describing the process of calculating the correct pump head for your situation.