With some exceptions (schedule differences, heat recovery in Baseline, etc. Nm/kg = J/kg = m 2 /s 2; Specific Work of a Pump or Fan. It is expressed 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 in turbo machines as fans, pumps, compressors or turbines has the SI-units. Calculate % Proposed Exhaust Fan Power --> 2,500 / 40,500 = 6.173%. 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. 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). BASIC FAN LAWS Existing Flowrate (CFM): Existing Static Pressure (in. 4. 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. 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 … Specific work of a pump or fan working with an incompressible fluid can be expressed as: w = (p 2 - p 1) / ρ (1) where = 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 Specific work is work per unit weight. 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. ), it’s OK to consolidate fan types in the Baseline. 2020 © Volution Ventilation UK Limited trading as Vent-Axia Company Number: 11352032. The requirement is simply that the fans serve the same functions. 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. 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 11. H2O): Existing Horsepower (HP): Existing Speed (RPM): New Speed (RPM): New Flowrate (CFM): 5. For the baseline case, 90% rule would hold true as stated in AHSRAE 90.1-2007. 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