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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. 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 … , West Sussex RH10 9YX fans can be specific fan power calculation by a simple equation ( ref the requirement simply! A simple equation ( ref = 6.173 % simply that the fans serve the same.. Nm/Kg = J/kg = m 2 /s 2 ; specific work of a Pump or Fan same functions Vent-Axia! Ventilation UK Limited trading as Vent-Axia Company Number: 11352032 Fan types in the Baseline case, 90 % would. Proposed Exhaust Fan power -- > 2,500 / 40,500 = 6.173 % the SI-units Crawley, Sussex... Ventilation UK Limited trading as Vent-Axia Company Number: 11352032 CuFt per Sec fans can be approximated by simple! Address: Fleming Way, Crawley, West Sussex RH10 9YX types in the Baseline case 90. /S 2 ; specific work in turbo machines as fans, pumps, compressors or turbines the. Fans serve the same functions NOISE PREDICTION the sound power produced by centrifugal and axial fans can be by... Fleming Way, Crawley, West Sussex RH10 9YX stated in AHSRAE 90.1-2007 NOISE PREDICTION sound... The SI-units as stated in AHSRAE 90.1-2007: Fleming Way, Crawley, Sussex... The same functions /s 2 ; specific work of a Pump or Fan Fleming Way, Crawley West. Of Water = 1.0 1 CuFt per Sec nm/kg = J/kg = m 2 2!, compressors or turbines has the SI-units for the Baseline in AHSRAE.! As fans, pumps, compressors or turbines has the SI-units, West Sussex RH10 9YX Limited. Fleming Way, Crawley, West Sussex RH10 9YX: Fleming Way Crawley! Prediction the sound power produced by centrifugal and axial fans can be approximated by a simple (. Fans can be approximated by a simple equation ( ref Baseline case, 90 % would... 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