Press

5 Strategies for Handling Differing System Conditions

Last month, we discussed how a constant volume heating, ventilation and air conditioning (HVAC) system would continually pump the same flow rate of chilled water through the entire system regardless of the cooling load. This worked well when maximum cooling was needed on a hot day, but during times of low cooling load, much of the chilled water would go through the bypass. This method allowed the system to be controlled, but at a high cost. Also discussed was how centrifugal pumps connected to variable speed drives (VSD) could be used to reduce the pumping cost in a chilled water system by varying the flow rate through the system to match the system’s cooling loads.
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Meter and Orifice Sizing

PIPE-FLO® Professional version 16.1’s new orifice and meter sizing functionality allows users to quickly determine the appropriate device size needed based on desired requirements. Meter and orifice calculations are performed in PIPE-FLO® in accordance to the following standards: ASME MFC-3M-2004 Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and Venturi, as well as ASME MFC-14M-2003 Small Bore Precision Orifice Meters.
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Using the K, Cv, Kv Calculator

Accuracy of hydraulic calculations is critical for the proper design, operation, and determination of cost for many types of piping systems in residential, commercial, and industrial applications. It is crucial that the engineer understand and apply the correct formula to prevent costly mistakes in the sizing and selection of equipment, operating within safety limits, and avoiding unnecessary modifications later in the process. One aspect that leads to mistakes is the misuse of coefficients that characterize the hydraulic performance of devices that have a fluid flowing through them.
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Using Fluid Piping Software to Design Energy Efficient Pumping Stations

The need for water and wastewater capacity is continually growing on a global scale, and with rising energy costs and a greater emphasis on being green, the users and designers of pumping systems in this industry are realizing the need for more efficient designs and practices. It is estimated that water/wastewater facilities account for 35 percent of typical municipal energy budgets 1. With pumping systems responsible for much of this power consumption, design optimization can result in significant energy savings.
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