Primary-secondary

Do you mean via heat exchangers?

If so then contact someone like Sondex and tell them what you intend doing.

I have an Alpha Laval chiller unit which cools fresh water on the primary side then through a heat exchanger to cool sea water. If your setup is similar then Sondex will do the calculations for you and supply a suitable heat exchanger.

Cool Pic of the Avatar. Does it run?

Ok to define a scope, Im talking Primary circuit with a chiller and the pumps, secondary circuit with a pump that takes the water from the primary and runs it thru different coils in a building, this system should be control with a VFD system depending on demand

Thank you

Contact Carrier Air cond. company... I worked for them for 11 years, that is what they do.

http://www.commercial.carrier.com/commercial/hvac/product_description/0,,CLI1_DIV12_ETI434_PRD1,00.html

There is an American standard called TEMA, Tubular Exchanger Manufacturers Association to assist users, engineers, designers and manufacturers, www.tema.org.

The best place to get the required information is ASHRAE Handbook which gives you detail of how to design your primary and secondary requirement for chilled water system.