Webinar: District Cooling & the Effects of Low Delta T

Chilled water provided from a utility plant is commonly used in a building’s HVAC system in lieu of installing chillers. Lower return water temperatures or low Delta T (∆T) decreases the efficiency of the entire chilled water system. This condition is known as “Low ∆T Syndrome”. Low ΔT syndrome is the result of the inefficient use of chilled water at the point of consumption. This presentation will provide a review of district chilled water system design and how low ∆T impacts both the chillers and the buildings the chillers are serving. We will also cover low ∆T and how it impacts pumping, causes of low ∆T, attempts to correct low ∆T and the relationship between low ∆T and chiller capacity. In conclusion, we will review a study of a building where “Low ∆T Syndrome” was corrected at the point of water to air heat transfer.

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do we just modulate the belimo valves then by setting the desired return chill water temperature and forget about the supply air temperature?