It is expressed Specific Gravity of Water = 1.0 1 CuFt per Sec. 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). Specific work is work per unit weight. 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). H2O): Existing Horsepower (HP): Existing Speed (RPM): New Speed (RPM): New Flowrate (CFM): 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. The design fan power calculations should take account of this. BASIC FAN LAWS Existing Flowrate (CFM): Existing Static Pressure (in. Here it is assumed that all of the heat to be dissipated is picked up by the air; i.e. If the fan pressure rise is not known it can be calculated approximately from Specific Fan Power (SFP) data using: Delta P = 1000 * SFP * Fan total efficiency Annex E of ISO 5801 shows that by rearranging the formula it can be derived that the SFP is a function of fan pressure divided by the efficiency of the fan … 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. 11. Specific work in turbo machines as fans, pumps, compressors or turbines has the SI-units. ), it’s OK to consolidate fan types in the Baseline. Registered Address: Fleming Way, Crawley, West Sussex RH10 9YX. 4. 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. The requirement is simply that the fans serve the same functions. 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 conduction and radiation as well as natural convection effects on the external surfaces of t Calculate % Proposed Exhaust Fan Power --> 2,500 / 40,500 = 6.173%. FAN NOISE PREDICTION The sound power produced by centrifugal and axial fans can be approximated by a simple equation (ref. Specific work of a pump or fan working with an incompressible fluid can be expressed as: w = (p 2 - p 1) / ρ (1) where Nm/kg = J/kg = m 2 /s 2; Specific Work of a Pump or Fan. For the baseline case, 90% rule would hold true as stated in AHSRAE 90.1-2007. With some exceptions (schedule differences, heat recovery in Baseline, etc. 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. 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. 1. = 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 ... 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