Dear Sir/Madam,

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

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 (http://www.fluidh.com/calcpumphead.html)

You will also find detailed instructions (http://www.fluidh.com/calcpumphead.html) describing the process of calculating the correct pump head for your situation.