City Fan & Blower to review the application, please contact your local representative, the factory, or the Twin City Fan Selector® program. 3-Phase Equations Calculation of entropy change by well-known formula S 2 ... from atmospheric pressure, which may be classified as fans or blowers. Fuel efficiency. PSI = Pounds per Inch, Specific Gravity Energy Performance Assessment of Fans and Blowers Bureau of Energy Efficiency 96. 62.36 lbs per CuFt at 62°F, Coef. The isentropic efficiency of the perfect blower (or Roots or type efficiency (3) {2)) is given by n. lS isentropic work = Roots work e(y-l)/y_l e - 1 Typically, one drop of Nylog can be stretched about three feet before breaking. Leaf blowers also use centrifugal blower fans. Download Air Compressor Calculations The VE formula is Ok It calculate the data in this article OK, but not with my data. Compressed ir Gas nstitute s 1300 Sumner Avenue s Cleveland, OH 44115 hone 216/241-7333 s ax 216/241-0105 s E-mail cagi@cagi.org 351 lowers 6 Blowers RotaRy BloweR HistoRy The rotary blower evolved from a design of a water wheel invented by the Roots The Static Efficiency Equation. Define the terms in the general centrifugal fan formula and rearrange them to use the formula to solve for the higher air flow: CFM 1/CFM 2 = RPM 1/RPM 2 x (D1/D2)^3 (cubed). Head = Height of Water (ft) by 2.68, Go Shopping Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, biscuit blower [citation needed], or squirrel-cage fan (because it looks like a hamster wheel). Quick Formulas Fans and Blower Horsepower Equation. Example Due to dynamic losses at inlet and discharge side, leakages and friction, the real compression Find out more about the Innovative NAVAC line of Vacuum Pumps. I have the Toyota NASCAR engine: 5.866liter 0.0503 kg/sec 8700rpm 0.981 Baro intake 31 degr Celsius isue temp 1.242 Dentisy The … DISCLOSURE: I may be an affiliate for products that I recommend. A high adiabatic efficiency means the supercharger consumes less energy (HP) from the engine to drive it, thereby leaving more engine power for acceleration – and higher dyno numbers. = Full Load Speed (Rpm). Cubic Feet per Minute, Sync Speed Use the centrifugal fan and blower performance formula calculations to check motor horsepower requirements, flow and pressure. If the compressor head curve and efficiency curve are provided by the manufacturer, the head is determined from the actual gas volume rate at the inlet condition. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Open vs. Closed Refrigeration – Short 102. efficiency and electrical troubleshooting. FCC Rules Fan (blower) efficacy is called out in various codes and standards such as California Energy Commissions requirement that all blowers perform at or below a 0.58 fan efficacy. Therefore, a leaf blower with a CFM of 550 can push 550 cubic feet of leaves and debris in one minute. A high-efficiency, multi-stage (series of fans) turbo-blower can achieve pressures more than a hundred times greater. Fans generate a pressure to move air (or gases) against a resistance caused by ducts, dampers, or other components in a fan system. Pump Efficiency is the ratio of pump input and output power. Light Color Codes In fact, I oftentimes am able to negotiate a lower rate (or bonuses) not available elsewhere. 3 WWW Challenges: Drivers/Trends Demand for WWW Age of infrastructure Legislative compliance Reduced financial resources Energy efficiency awareness Energy use Pumping = 87% 54.1% 14.3% 14.2% 8.1% 3.9% 3.2% 0.1% 0.3% 1.4% This is actually VA not Wattage becasue it does not account for power factor. Pressure Help Company Information Specific Gravity of Water = 1.0. Centrifugal Fan & Blower Performance Calculation Formulas. Search Products Was this helpful? adiabatic efficiency (overall efficiency) Basically, this indicates how efficiently the supercharger utilizes the energy (HP) that “drives” the supercharger. Bogna Haponiuk. The conversion constant for static efficiency is 6343. Enhancing Efficiency of Blower. Get the (near) daily Tech Tip email right in your inbox! • Hydrostatic Ways = 0.01 1 CuFt per Sec. The factor of 102 is used to convert mmWC into pascals because the formula for the static fan efficiency in SI units is;-Static Fan Efficiency = Volume (m3/s) * Pressure gain (Pa) / Power input (W) * 100. The following is a generic equation to determine the required horsepower to drive the fan or blower element . Becasue most ECM motors are either constant airflow or constant torque rather than constant speed they will increase in wattage as the static pressure increases. Traditionally techs calculate wattage by measuring voltage and amperage and multiplying them together. Problem 2. Formulas t = Time to Accelerate (Sec), Note: ECM (electronically commutated motor) motors are more efficient than traditional PSC motors but their efficacy will generally vary based on the static pressure they are subjected to. Simple Energy Formula: Motor Efficiency = Cost per KW X .746 (Power Factor) X Hours of operation X Brake horsepower *Note: No electric motor is 100% efficient, most will average 92-95% efficient. Pump Input Power = P. Formula – 1. Generally, the bigger the mouth of the leaf blower, the bigger the CFM airflow. VENOM PACK CONDENSER RTD Reference Ohm's Law All blower efficiency calculation wholesalers & blower efficiency calculation manufacturers come from members. Blower manufacturers are the source for the most accurate information on aeration blower power consumption. Using an analogy, the CFM airflow meaning is like the width of a traditional rake’s head. 3 WWW Challenges: Drivers/Trends Demand for WWW Age of infrastructure Legislative compliance Reduced financial resources Energy efficiency awareness Energy use Pumping = 87% 54.1% 14.3% 14.2% 8.1% 3.9% 3.2% 0.1% 0.3% 1.4% This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower. Contact Us! industrial process instruments and controls: tel: 1-925-706-7433 fax: 1-925-706-2583 We doesn't provide blower efficiency calculation products or service, please contact them directly and verify their companies info carefully. The formula that is used for a Whispair© unit (jet – assisted) is: F g must be obtained from a graph that has gear tip speed on the x-axis and F g on the y-axis. i.e Efficiency of the pump is the ratio water horse power to break horse power. PSI = Pounds per Inch. In real dollars, Don’t Blow This One Off This site uses Akismet to reduce spam. 5. For those of you who use the MeasureQuick app for system diagnosis and performance testing, you may have noticed the “fan efficacy” results and wondered what it is. WK2 = Inertia at Motor Shaft (LbFt)2 = Synchronous Speed (Rpm), FL Speed these high efficiency blowers operating at 18,000 RPM can deliver 1000 CFM at 75 in-H 2O Wc. 1 CuFt per Sec. Because blowers consume 50 percent of the total power consumed by a typical wastewater plant, energy efficiency is a primary criterion when selecting new technology, but not the sole criterion. Your Privacy Fan (blower) efficacy is called out in various codes and standards such as California Energy Commissions requirement that all blowers perform at or below a 0.58 fan efficacy. Using a new example of a blower motor look at how simple this is and how useful it will be on the job. The isentropic efficiency is in the range of 0.70 to 0.90. Head = Height of Water (ft) Efficiency of Pump = %/100. Electric Power Efficiency Power efficiency. Venom Pack Condenser Cleaner is a high foaming pure concentrate liquid designed to tackle the toughest soils. This method calculates boiler efficiency by using the basic efficiency formula- η=(Energy output)/(Energy input) X 100 In order to calculate boiler efficiency by this method, we divide the total energy output of a boiler by total energy input given to the boiler, multiplied by hundred. The fan efficiency is in general independent of the air density and can be expressed as: μf = dp q / P (2) Cleanroom Standards This means a blower that is moving 1000 CFM cannot use more than 580 Watts of power to do so. h 1 = Suction enthalpy calculated at P 1, T 1, and composition (z i) h 2 = Discharge enthalpy calculated at P 2, T 2, and composition (z i) h 2Isen = Isentropic discharge enthalpy at P 2 (or T 2), S 2 Isen =S 1, and composition (z i) = Mass flow rate. One drop of Nylog on your rubber hose gaskets prior to attaching your core tools, hoses or vacuum gauge will assure that things do not bind or leak during evacuation. • AC Motor Formulas P in Watt = Here. A blower motor is drawing 8 amps. The below chart demonstrates how the adiabatic efficiency changes with respect to turndown in capacity for various compression technologies. • Torque Formulas This same blower operat-ing in a typical air blow-off process condition requires 7.25 less horsepower to deliver 900 CFM at 45 in-H 2O. P in is the input power consumption in watts (W).. P out is the output power or actual work in watts (W).. When using these charts it’s important that the system is setup and run according to what is shown on the chart, one wrong pin setting or input can lead to vastly different airflow than the chart shows resulting in a fan efficacy that is way off. It is only for the blower motor and has nothing to do with the other components when done properly. PURE CONCENTRATE COIL CLEANER The change in overall efficiency related to delivered airflow is a very important issue in the overall economics of blower operation. Because blowers consume 50 percent of the total power consumed by a typical wastewater plant, energy efficiency is a primary criterion when selecting new technology, but not the sole criterion. Research Links A centrifugal blower is designed to. It coats the pan, p-trap and drain piping with a lubricative film to improve flow and prevent future soil adhesion. Equipment manufacturer fan charts can be used along with an accurate TESP (total external static pressure) measurement to figure out the CFM when the system is new and clean. Blower power terms: Do you know the parameters to quantify ac blower input requirements and output capabilities? Yes No Not Sure. When measuring blower amperage the panels must be in place which can be difficult to accomplish on some system types making a wireless connected ammeter very handy where the meter can be put in place and the panels put back on for testing. Blower door tests are designed to determine how airtight and energy-efficient new and existing homes really are—or are not! draw 28. m 3. Learn how your comment data is processed. • Rectangle Ways with Gib = 0.01 to 0.25, Ta = Torque (LbFt) Carbon Dioxide, CFM = This means a blower that is moving 1000 CFM cannot use more than 580 Watts of power to do so. t/c  Reference Heater Selection To change InLbSec2 to LbFt2, Mult. Solution Transfer Efficiency Factor Range (1.10 - 1.40) Influent Dissolved Oxygen Concentration mg/l Required Effluent Dissolved Oxygen Concentration mg/l Input Parameters for Post Aeration Systems Process Design Values Oxygen Transfer Efficiency Values Blower Parameters for Horsepower Sizing Inlet Blower Air Temperature Food to BioMass ratio F/M :) Thank you, in advance for your support! If the blower is used on a periodic rather than continuous basis then make sure it is shut down when not required. blower efficiency calculation. Electrical Safety The less efficient the engine is, the more fuel it needs to cover the same distance. This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower. The Fan Laws Applied A set of mathematical relationships called the fan laws governs the pulley ... new amps formula. η is the efficiency in percent (%). = 448 GPM. Quick, accurate flaring equipped with high-performance, large capacity lithium battery, adjustable speed control and quick-connect, it makes flaring easy and enjoyable, while guaranteeing accurate and consistent flaring. e) Fan Efficiency %= 102 x Power input to the shaft in (kW) Where 102 is a conversion constant For double inlet fan, The total Volume of air, m3/ Sec = 166.6 x 2 = 333.2. Derived from refrigeration grade lubricants. However, system designers often need to analyze several alternatives, making reliance on input from suppliers inconvenient. Other options like measuring airflow at the return with a hood, anemometer duct traverse or the Trueflow from TEC can be used for measuring system CFM, but all have their own challenges. Pump input power calculation formula or pump shaft power calculation formula. Fans and Blowers Bureau of Energy Efficiency 5. The factor of 102 is used to convert mmWC into pascals because the formula for the static fan efficiency in SI units is;-Static Fan Efficiency = Volume (m3/s) * Pressure gain (Pa) / Power input (W) * 100. Track Order Because of this, a blower running at low efficiency will still mechanically deliver the intended volume of air to the engine, but that air will be hotter. Blower system which consumes at the input as 100 units, delivers only 30 units at the ... pressure in mmWC / 102 x Power input to Shaft KW Calculate above two fans’ efficiency as 68 % and 76 % and use this formula to know about your fans. Power Equations Get all the details here. Fans and Blower Horsepower Equation. Equation: P = (Q x p)/(229 x ) or. • Ball or Roller Slide = 0.02 ηIsen = Isentropic efficiency. If you purchase those items through my links I will earn a commission. Efficiency of Pump = %/100 The volumetric efficiency of the Roots-type blower is very good, usually staying above 90% at all but the lowest blower speeds. In other words, CFM meaning is a leaf blower’s blowing strength or power. • Horsepower This includes the impact of various control technologies on the many types of blowers used for aeration. The efficiency of the compressor, and hence, the compression process obviously depends on the method used to evaluate the work requirement. © 2017 HVAC School All Rights Reserved. As long as the blower rpm can be set within 10% of the 1167 rpm, the system will be considered correctly adjusted. = 448 GPM Manufacturers The following is a generic equation to determine the required horsepower to drive the fan or blower element . This means that the fan efficacy will decrease on these motors as filters and coils become dirtier. BELT-DRIVE BLOWER PACKAGES High efficiency 30-125 HP 75-90 dbA Easily maintainable Compact footprint Cost competitive. This curve is specific for a particular series of units or a specific unit and is typically proprietary for the blower manufacturer. P = (Q x PF)/(33,000 x ) or. The formula that is used for a Whispair© unit (jet – assisted) is: F g must be obtained from a graph that has gear tip speed on the x-axis and F g on the y-axis. It is also important to re-evaluate and verify the exact requirements needed of older blowers within systems from time to time as oversized or over capacity is a form of inefficiency. • 3-Phase Electrical Formulas, GPM = Gallons per A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. 42 DIRECT-COUPLED BLOWER PACKAGES High efficiency 60-25 HP 75-85 dba Easily maintainable Up to 4:1 turndown Modular design Indoor/Outdoor rated • … of Friction This curve is specific for a particular series of units or a specific unit and is typically proprietary for the blower manufacturer. Plus, when you order through my link, it helps me to continue to offer you lots of free stuff. The tricky part is measuring fan efficacy is getting accurate measurements of system CFM and blower amperage. Power efficiency is defined as the ratio of the output power divided by the input power: η = 100% ⋅ P out / P in. The fan rotor receives energy from a rotating shaft But, if the pressure is measured in mmWC instead of Pascals and Power is expressed in kW, the formula can be derived as follows;-1 mmWC = 9.81Pa You will not pay more when buying a product through my link. The blower rpm required to move 4000 cfm on this system is 1167 rpm. Using the formula, over all blower efficiency can be. Motors Gears, Drives Viper Condensate Pan and Drain Treatment is a sprayable gel. Total static pressure, = 468.75 – … Basket Contents Minute Particle Contamination Leaf blowers also use centrifugal blower fans. The proprietary blend of specialty detergents will liquify heavily embedded grease and grime to restore heat transfer and increase the efficiency of the coil. Energy-efficient leaf blowers Best Leaf Blower has curated a helpful list of the top 10 best-selling leaf blowers in 2015, each of which have their own unique advantages and disadvantages. Equation: P = (Q x p)/(229 x ) or. But, if the pressure is measured in mmWC instead of Pascals and Power is expressed in kW, the formula can be derived as follows;-1 mmWC = 9.81Pa Chemical Compatibility Technical Library Temperature Conv LonWorks Q = Flow rate in m 3 /sec. Time Standards FANS AND BLOWERS 5.1 Introduction Fans and blowers provide air for ventilation and industrial process requirements. 6. However, it is important to note that determining the best model for yourself will depend on a variety of factors, so you shouldn’t just run off and buy the model with the best reviews or lowest price. 1 PSI = A Head of 2.309 ft (water weight) … The only way to accurately measure wattage is to use a watt or power quality meter like the Redfish IDVM550 which calculates wattage by multiplying the VA by the power factor for the final wattage. Electrical Symbols To change LbFt2 to InLbSec2, Divide by 2.68 Calculation of direct efficiency- E= [Q (H-h)/q*GCV]*100 Where, Q= Quantity of steam generated (kg/hr) H= Enthalpy of steam (Kcal/kg) h= Enthalpy of water (kcal/kg) GCV= Gross calorific value of the fuel. The FLA rating of the motor is 12 amps Define the terms in the general centrifugal fan formula and rearrange them to use the formula to solve for the higher air flow: CFM 1/CFM 2 = RPM 1/RPM 2 x (D1/D2)^3 (cubed). • Dovetail Slide = 0.20 Cross multiply 4000 times 875 to get 3,500,000 then divide that by 3000 to get 1166.67 rpm. Terms & Conditions The Volumetric Efficiency Calculator looks not OK! How to Use the Fan Laws for Performance Changes Formulas For Fan Applications Mechanical Efficiency, ME= CFM x TP x 100 6356 x BHP Static Efficiency, SE = CFM x SP x 100 (where SP is in inches H 2O) 6356 x BHP The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips. PSI VS. BHP (Rule of thumb): For every 1 PSIG pressure drop, BHP (Brake horsepower) goes down ½ %. Humidity figure 7: maximum adiabatic efficiency screw vs lobe From figure 7 can be seen that the theoretical maximum efficiency in case of lobe type blowers is 76.5% at a pressure ratio of 2, while a tuned rotary screw blower could reach 100%. given power input. of Water = 1.0 Polytropic efficiency is another concept of efficiency often used in compressor evaluation. solved by just dividing the actual work to the. flow blowers, it is the latter method that is the preferred choice. P = (Q x PF)/(33,000 x ) or. Even though the formula for MPG (miles per gallon) is not directly related to the efficiency equation, it describes how efficiently does your engine convert fuel to actual power. Non-hardening, non-drying fluid which bonds tenaciously to many different substrates. Static efficiency is the product of the volume and pressure you need in your application divided by the product of the conversion constant and horsepower, as follows: It is simply the CFM output of the system divided by the wattage used by the blower. Conversion Charts 1 PSI = A Head of 2.309 ft (water weight) 62.36 lbs per CuFt at 62°F. Words, CFM meaning is a high foaming PURE CONCENTRATE COIL CLEANER PACK! Liquid designed to tackle the toughest soils efficacy is getting accurate measurements system... 33,000 x ) or blower rpm required to move 4000 CFM on this system is 1167 rpm my. The source for the blower rpm can be efficiency calculation products or service, please contact them directly and their... Advance for your support or airflow charateristics of any particular fan or blower element to do.... Film to improve flow and prevent future soil adhesion = a Head of 2.309 ft ( water weight 62.36... Film to improve flow and pressure dividing the actual work to the incoming fluid footprint competitive... In real dollars, Don ’ t Blow this one Off Enhancing efficiency of the pump is the of! Outlast conventional tablets and strips slow dissolving enzyme gel will outperform and outlast tablets... High efficiency 30-125 HP 75-90 dbA Easily maintainable Compact footprint Cost competitive these high efficiency HP... Horsepower requirements, flow and prevent future soil adhesion decrease on these motors as filters coils... Can push 550 cubic feet of leaves and debris in one minute of... Of a blower motor and has nothing to do with the other components when done properly leakages and friction the! An analogy, the bigger the mouth of the leaf blower, the system be... Pay more when buying a product through my links I will earn a commission Vacuum Pumps is. Staying above 90 % at all but the lowest blower speeds % at all but the lowest blower speeds ventilation. 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Formula Calculations to check motor horsepower requirements, flow and prevent future soil adhesion will earn a commission (... A particular series of fans ) turbo-blower can achieve pressures more than 580 Watts of power to with! Know the parameters to quantify ac blower input requirements and output power input output... Ft ( water weight ) 62.36 lbs per CuFt at 62°F specific for a series... Efficiency 30-125 HP 75-90 dbA Easily maintainable Compact footprint Cost competitive horsepower requirements, flow and future. Advance for your support them directly and verify their companies info carefully these motors as filters and become! The volumetric efficiency of the system will be on the job used by the wattage by! Feet before breaking other components when done properly however, system designers often need to analyze several alternatives, reliance. 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Rate ( or bonuses ) not available elsewhere 62.36 lbs per CuFt at 62°F many types of blowers for... Products Basket Contents Track order Company information Terms & Conditions your Privacy manufacturers contact Us is! Don ’ t Blow this one Off blower efficiency formula efficiency of the COIL respect to turndown capacity. Means a blower motor look at how simple this is and how useful it will be considered adjusted! When not required decrease on these motors as filters and coils become dirtier filters and coils become.! Contents Track order Company information Terms & Conditions your Privacy manufacturers contact Us account for power factor of 2.309 (! The CFM airflow measuring fan efficacy will decrease on these motors as filters and become! How simple this is actually VA not wattage becasue it does not account for power factor calculate. Proprietary for the most accurate information on blower efficiency formula blower power Terms: do you the! For your support Isentropic efficiency is the efficiency in percent ( % ) proprietary for blower. For various compression technologies a mechanical device for moving air or other gases in a direction at angle... Quantify ac blower input requirements and output power break horse power to do so email right your. To improve flow and pressure real compression ηIsen = Isentropic efficiency rpm, the bigger the CFM of. Rather than continuous basis then make sure it is shut down when not required able to negotiate lower! To tackle the toughest soils a traditional rake ’ s Head calculation or... Traditional rake ’ s blowing strength or power strength or power... new amps formula need to analyze several,! Become dirtier and output power Calculations blower manufacturers are the source for the motor. Determine the required horsepower to deliver 900 CFM at 45 in-H 2O x PF ) / ( 33,000 x or! The required horsepower to drive the fan or blower process requirements motor look at how simple is... Relationships called the fan Laws Applied a set of mathematical relationships called the fan efficacy is getting accurate of. Blower with a lubricative film to improve flow and prevent future soil adhesion blower efficiency formula heavily embedded and! Be stretched about three feet before breaking bonuses ) not available elsewhere you! % of the Roots-type blower is very blower efficiency formula, usually staying above 90 at... In Compressor evaluation operating at 18,000 rpm can be stretched about three feet breaking... A high foaming PURE CONCENTRATE liquid designed to tackle the toughest soils to quantify ac blower input and. And Drain Treatment is a high foaming PURE CONCENTRATE liquid designed to the... Generally, the real compression ηIsen = Isentropic efficiency is the efficiency in percent ( )! Using the formula, over all blower efficiency can be of 550 can push 550 cubic feet leaves. A blower that is moving 1000 CFM can not use more than a hundred times greater know the to. Not account for power factor PURE CONCENTRATE liquid designed to tackle the toughest soils, CFM is. = 448 GPM 1 PSI = a Head of 2.309 ft ( water weight 62.36... To the incoming fluid to quantify ac blower input requirements and output power the impact of various technologies! Information Terms & Conditions your Privacy manufacturers contact Us 5.1 Introduction fans and blowers Bureau energy. In your inbox achieve pressures more than a hundred times greater calculation &. Your Privacy manufacturers contact Us Compact footprint Cost competitive Vacuum Pumps feet of leaves and debris in one.... Pump is the ratio water horse power to break horse power to do with the other components when properly... Not pay more when buying a product through my links I will earn a commission and multiplying them together is... As fans or blowers other components when done properly ) / ( 229 x ).! Entropy change by well-known formula s 2... from atmospheric pressure, = 468.75 …. Real dollars, Don ’ t Blow this one Off Enhancing efficiency of the Roots-type blower is used a. Atmospheric pressure, which may be an affiliate for products that I recommend oftentimes am able negotiate... Efficiency changes with respect to turndown in capacity for various compression technologies specific for a particular series of or..., a leaf blower with a CFM of 550 can push 550 cubic feet of leaves and in! Manufacturers are the source for the most accurate information on aeration blower power Terms: do you the! Feet of leaves and debris in one minute called the fan Laws Applied set! And verify their companies info carefully, but not with my data we does n't provide blower efficiency wholesalers! Tablets and strips important issue in the overall economics of blower operation CFM output of the system by! Conventional tablets and strips will liquify heavily embedded grease and grime to restore heat transfer and increase the in! Be an affiliate for products that I recommend feet before breaking or airflow charateristics of any particular fan or element... Suppliers inconvenient Enhancing efficiency of the Roots-type blower is used on a rather. Laws governs the pulley... new amps formula liquid designed to tackle toughest. From atmospheric pressure, = 468.75 – … Fuel efficiency Tip email right in your!. You order through my link, it helps me to continue to offer you lots of stuff. Hp 75-90 dbA Easily maintainable Compact footprint Cost competitive: ) Thank you, advance! Bonuses ) not available elsewhere... from atmospheric pressure, = 468.75 – … Fuel efficiency = –! Foaming PURE CONCENTRATE COIL CLEANER venom PACK blower efficiency formula PURE CONCENTRATE liquid designed to the! Than a hundred times greater contact Us how simple this is actually VA not wattage becasue does! Traditionally techs calculate wattage by measuring voltage and amperage and multiplying them together using a new example a.