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The article discusses a strategy for operating a primary/secondary (P/S) plant based on full loading of chiller before another chiller is turned on. The author explores the performance of the P/S plant with bypass control and compares it with the performance under control of temperature of water entering air-handler coil. Several graphs depicting the performance comparison are also offered.

The article focuses on the mechanism of mixed-air-plenum in controlling outside air quantity in variable-air-volume (VAV) air handling systems. It notes that system should produce the minimum outside air quantity along with varying load-dependent supply-air quantity. It cites methods including direct measurement of outside-air via pitot or electronic device, fan tracking which measures supply and return air flow, and utilization of gravity dampers to control building pressure.

The article presents information on various heating, ventilation and air-conditioning products including the R-410A refrigerant from WaterFurnace International Inc., the DFD-LP fire damper from Ruskin Co. and the InRow DX data-center cooling solution from Schneider Electric.

The article reports on the initiative of Boston Marriott Copley Place hotel in Massachusetts to reduce energy consumption and increase operational efficiency. It indicates that the hotel installed kitchen ventilation controls called Intelli- Hood from Melink Corp. It mentions that the Intelli-Hood control systems will reduce exhaust automatically and adjust air-fan speed during idle cooking times.