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Danfoss Drives - Page 4
VLT® solutions optimise cooling systems District cooling District cooling is becoming increasingly interesting due to the high demands for energy optimisation. District cooling is made by absorption and adsorption cooling from electricity production, heatpump systems or natural cooling from the sea or underground. VLT® drives can optimise the control of the system and help to increase the total energy saved. The larger the system, the greater power required – and VLT® drives go all the way. Stable cooling circuit • Efficiency increase of electronic expansion valves • Avoiding “flash gaz” due to lack of subcooling when fans are switching • Stable liquid level Lower noise level: • Lower speed at fan extremities • No switching and changing noise levels Less dirt in coils: • Lower Δt and higher compressor efficiency • Less maintenance costs 4 Pump Adding VLT® drives on pump applications in the refrigeration system will reduce the energy comsumption while increasing system performance. The Sleep Mode will prevent pumps running at low or no flow. The Dry Pump Protection and End of Curve Detection will protect the system in case of defective pumps or leaks.