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The Engineering Toolbar
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From Kele Inc.
Many seminars and technical sessions have been held to outline procedures for balancing variable flow water systems. Most of these sessions recommend "Proportional Balance." When this technique is used, all control valves are set wide open and the circulating pump is operated at maximum speed. If the pump is not sized for the sum of total coil loads, then each coil balancing valve is adjusted for proportional flow. For example, if the pump will handle 80% of the total coil load, then each coil would be balanced for 80% of the specified coil G.P.M. Products & Services
Flow meters (flowmeters) and flow sensors are devices used for measuring the flow rate or quantity of a moving fluid or gas.
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Learn more about Flow Meters
Liquid flow meters are used for measuring the flow or quantity of a moving fluid.
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Learn more about Liquid Flow Meters
Gas flow switches and liquid flow switches, velocity, are used to measure the flow or quantity of a moving fluid in terms of velocity, such as feet per minute.
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Learn more about Velocity Flow Switches
Air velocity flow sensors measure air velocity or volume flow using insertion probes or capture hoods.
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Learn more about Air Velocity Flow Sensors
Ultrasonic flow meters use sound waves to determine flow rates. They can be either Doppler Effect meters or Time-of-Flight meters.
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Learn more about Ultrasonic Flow Meters
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Topics of Interest
ALLOCATION OF BALANCING GRADES
We see that, in the retrospective DOP, all deltas on fixed grades, intermediate stocks, and crude run have been eliminated. The deltas between actual production and...
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Valve sizing cannot be accurate without firm understanding of the hydronic system. While valves are the final control element, the balancing, coil sizing, coil response curve, and the piping losses...
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FIRST STAGE
The project began with modifications to an existing 3-ton (10.6 kW) variable-speed air-to-air heat pump. The machine has an ARI 210/240 rating of SEER=15.2 (COP=4.5) and an HSPF=8.75...
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Questions and Answers
M-1
A centrifugal pump delivers 300 gpm of water at 3,000 ft total dynamic head when operating at 3,500 rpm.
At what speed must a geometrically similar pump...
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13-1 Classification of Pumps.
Classified by use, pumps are called: low service, high service, deep well, booster, sewage, sludge, boiler feed, chemical, proportional feeders, air blowers, etc.
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