Primary Variable Chilled Water system

What about them, specifically?

Do you ever partake in "Refrigeration Engineer.com" in the U.K.

Yes: What about them? There are many types. i.e. I do chill water system for fish storage in Small Boats , Engine Driven. 4 ton.

dellori3

I am talking about a system with a variable flow chiiled water system who serves chilled water to a hotel complex depending on demand...

thank you

Most chillers require a minimum flow through the evaporator. Therefore, variable flow systems are designed around a primary and a secondary pumping system. The secondary system may consist of one variable pump or a combination of pumps and only one being a variable pump. Also depending on the overall tonnage, there may be more than one chiller. There is also a control sequence of operation that must be developed. This is generally done through the use of a computer.

Things to avoid is the short cycling of the chillers and pumps.

Economizers are also used in these types of systems as outside air temp is often usable as the cooling requirements. All controlled by computer using sensors.

dellori3

For a simple explanation, with links to other sources: (1) Go to www.mcquay.com, (2) Select "Americas" (3) Select "Literature" (4) Select "Design Tools" (5) Select "Systems" (6) Select "Variable Flow Chiller Plants." This website has two or three other documents you might find useful.

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• All-Variable Speed Chilled Water Distribution Systems

The Trane web site also has "White Papers" on Variable Flow Chilled Water Systems. You may also want to look into wet economizer cycles. I design Central Plants for the Large Casinos in Vegas. We have tried just about every Chiller arrangement out there.