Nm/kg = J/kg = m 2 /s 2; Specific Work of a Pump or Fan. Specific Gravity of Water = 1.0 1 CuFt per Sec. BASIC FAN LAWS Existing Flowrate (CFM): Existing Static Pressure (in. = 448 GPM 1 PSI = A Head of 2.309 ft (water weight) 62.36 lbs per CuFt at 62°F : For Fans and Blowers: HP = HP = HP = Where: CFM = Cubic Feet per Minute PSF = Pounds per Square Foot ... Power Equations Pressure Help Quick Formulas Research Links Temperature Conv t/c Reference RTD Reference Motor power required for its working depends upon the following factors:-ID Fan Capacity – Quantity of flue gases drawn from the system measured in (m^3/Hr). Over the years the formulas behind the tools have been developed and enhanced along with the pump and fan manufacturers in order to provide accuracy. Specific work of a pump or fan working with an incompressible fluid can be expressed as: w = (p 2 - p 1) / ρ (1) where Specific work is work per unit weight. With some exceptions (schedule differences, heat recovery in Baseline, etc. The design fan power calculations should take account of this. 2020 © Volution Ventilation UK Limited trading as Vent-Axia Company Number: 11352032. It is expressed 4. EnergySave is a user-friendly and interactive tool for comparing AC drive control against traditional flow control methods in different applications such as pumps, fans and compressors. ASHRAE Handbook) LW = KW + 10 log10 Q + 20 log10 P +BFI +CN where: LW= sound power level (dB) KW = specific sound power level depending on the type of fan (see Fig 9-3), from empirical data provided by fan manufacturer H2O): Existing Horsepower (HP): Existing Speed (RPM): New Speed (RPM): New Flowrate (CFM): 1. Calculate % Proposed Exhaust Fan Power --> 2,500 / 40,500 = 6.173%. ID Fan Head – Amount of pressure required by flue gases to overcome the friction or bending losses as it passes through the system, measured in (mmWC). Specific work in turbo machines as fans, pumps, compressors or turbines has the SI-units. Calculate Total Baseline Fan Power allowances per Appendix G, G3.1.2.9 (another way to check your fan power allowance calcs is the newest version of COMcheck, which includes the fan power calcs, finally :) ) 6. ), it’s OK to consolidate fan types in the Baseline. For the baseline case, 90% rule would hold true as stated in AHSRAE 90.1-2007. The requirement is simply that the fans serve the same functions. FAN NOISE PREDICTION The sound power produced by centrifugal and axial fans can be approximated by a simple equation (ref. Definition, physical background and calculation of SFP For simplicity of presentation, we consider only one air stream, in reference conditions as set in ErP Regulation but the methodology is of course applicable on both streams : A (Specific Fan Power) is defined as the ratio between an electrical input power and an airflow. 5. 11. conduction and radiation as well as natural convection effects on the external surfaces of t Here it is assumed that all of the heat to be dissipated is picked up by the air; i.e. Specific Fan Power (SFP) If we assume that the air-handling unit is selected with heat recovery then the biggest energy consumers are the fans. Registered Address: Fleming Way, Crawley, West Sussex RH10 9YX. 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specific fan power calculation

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