Webinar: Correcting Low ∆T in Buildings with District Cooling

Chilled water provided from a utility plant is commonly in a building’s HVAC system in lieu of installing chillers. Lower return water temperatures or low ∆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. Finally, we will review a study of a building where “Low ∆T Syndrome” was corrected at the point of water to air heat transfer.

[@philipsimon8784]

We are using VFDs to control the pumps speed to match the flow requirements for varying load conditions in the building. In addition, 3 port bypass valves are installed at the index point to maintain cooling demand. Would Belimo controls be of use here in this design since the flow is already controlled using drives?

[@balajibala9836]

Is delta T calculated from the supply and return temperature of buldings or the chiller set point to return ???

[@greg-ZE]

Technically both, but the video addresses the issue where the intent was for a building or coil to achieve a higher delta T (i.e. temperature rise across the building/coil), but the actual performance is less. The intent would be to match the desired condition at your chiller plant..