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Chapter 4.6 - Fans and Blowers

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6. ENERGY PERFORMANCE ASSESSMENT OF FANS AND BLOWERS 6.1 Introduction This section describes the method of testing a fan installed on site in order to determine the performance of the fan in conjunction with the system to which it is connected. 6.2 Purpose of the Performance Test The purposes of such a test are to determine, under actual operating conditions, the volume flow rate, the power input and the total pressure rise across the fan. These test results will provide actual value for the flow resistance of the air duct system, which can be compared with the value specified by supplier. 6.3 Performance Terms and Definitions Static Pressure: The absolute pressure at a point minus the reference atmospheric pressure. Dynamic Pressure: The rise in static pressure which occurs when air moving with specified velocity at a point is bought to rest without loss of mechanical energy. It is also known as velocity pressure. Total Pressure: The sum of static pressures and dynamic pressures at a point. Fan Shaft Power: The mechanical power supplied to the fan shaft Motor Input Power: The electrical power supplied to the terminals of an electric motor drive. Fan Efficiency: The air power static divided by impeller power Static Fan Efficiency % = Volume in m 3 / Sec x total pressure in mmwc 102 x Power input to the shaft in (kW) 6.4 Scope The procedure describes field testing of centrifugal fans and blowers for assessing performance and efficiency. 6.5 Reference Standards British Standard, BS 848 - Fans for general purposes Part 1, Methods of testing performance Bureau of Energy Efficiency 87

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