Retrofitting

A large facility that requires several chillers to satisfy the peak building load usually has chillers that have different capacities and efficiencies. As the building load increases from zero to the peak daily use, there’s […]

Chillers operate more efficiently when they provide chilled water at warmer temperatures. A familiar EMS controls application keeps close tabs on the building load by measuring the return fluid temperature and rate of flow, then […]

Hydronic systems are often designed with a backup pump for both the hot-water and chilled-water loops. This not only allows uninterrupted service when one of the pumps is down for maintenance, but also— with a […]

Chiller efficiency is also dependent on condenser-water temperature. The equipment usually performs best at a steady, low condenser-water temperature. This is accomplished by several means: two-speed or variable-speed cooling-tower fans, cooling-tower cell sequencing, or use […]

At this point, there are on/off controls in place for virtually every major item of the HVAC system. It is now possible to use the EMS to great advantage by monitoring the electrical demand and […]