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Retrofitting

The Fan Laws

Two kinds of fans are used in HVAC applications: centrifugal and axial. Centrifugal fans can generate higher pressures, such as those needed to overcome the high resistance of duct systems, while axial-flow fans can deliver […]
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Retrofitting

Main Branch Line off a Hydronic Loop

A large facility may have a complex fluid loop, with several sub-branches off the main supply and return lines. Each loop should be provided with valves on the supply and return lines. These serve two […]
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Retrofitting

Cooling Tower

A cooling tower is a complex system designed to cool the circulating water by evaporation. The water is atomized, then circulated through the tower, where it’s further cooled by a forced airflow caused by the […]
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Retrofitting

Water-Source Heat Pump

A new technology to replace the air-cooled condenser technology is the Water-Source Heat Pump (WSHP). Instead of rejecting heat to the atmosphere via an air-cooled condensing unit, the WSHP rejects heat to water in a […]
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Retrofitting

Cooling-Tower Maintenance Tasks

As with any complex mechanical system, maintenance is the key to performance. Cooling towers are more intricate than most systems, representing the careful coordination of fluid, electrical, and mechanical systems. As a result, there are […]