Updated: Sep 11, 2019
How to maintain peak production
A properly sized chiller is necessary, but not sufficient to ensure your facility stays at peak production. A properly designed glycol piping system will distribute the cooling from your chiller evenly to your tanks. This ensures loads closer to the chiller do not obtain preferential cooling, and avoids extended pull-down rates for those loads that are further out.
A simple and proven method of glycol piping that will evenly distribute chiller capacity is the reverse return piping system depicted in the schematic below.
Extending the return piping leg as shown results in the same length of piping (supply + return) to all loads. This results in an even pressure drop between the loads, and thus, even glycol flow and cooling supplied to each load.
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2008 ASHRAE Handbook: HVAC Systems and Equipment
CHAPTER 12 HYDRONIC HEATING AND COOLING SYSTEM DESIGN