Freshwater is a critical natural resource; we are all more conscious of our water consumption now more than ever. Using a hybrid or economizing cooling system can dramatically reduce annual water consumption. Hybrid cooling is a change-over application, in which either free cooling is used in cool weather conditions or cooling with a chiller is used in warm weather conditions.
The 3-way change-over butterfly valve handles the change-over between free cooling and cooling with the chiller. Two 3-way control butterfly valves (mixing valves) control the temperatures at the heat exchanger and/or the chiller. During commissioning and maintenance, Belimo manual open/close butterfly valves with gearwheels isolate the pumps, chillers, dry cooler, and strainers. Differential pressure sensors monitor the differential pressure of the pumps to ensure the pumps are functioning and to avoid irregular operating states (cavitation, the air in the system, etc.). Differential pressure sensors monitor the strainers to detect contamination in the pipe system at an early stage. Static pressure sensors detect leakages in the system. In most cases, the volumetric flows of the generator (chiller) and consumer (usually partial load) will vary, meaning that a hydraulic separator or a buffer tank is used for the required load equalization.
The Belimo butterfly valves features and advantages are:
Belimo sensors features and advantages are:
In a hybrid cooling application, it is possible to select from various products. Our recommendations do not replace the individual system planning and design of hydraulic components. As a rule, planning should always be accomplished in coordination with the manufacturers of chillers and pumps. Belimo butterfly valve assemblies and sensors have been specially designed and developed for HVAC applications. They are maintenance-free over their entire lifecycle and are backed with a 5-year warranty. All butterfly valve-actuator combinations with PR actuators are equipped with Near Field Communication (NFC) and enable rapid commissioning and parametrization with a smartphone and the Belimo Assistant App. The electronic fail-safe assemblies offer SuperCap technology that provides an intelligent and energy-efficient alternative to the mechanical spring return. Learn more online.