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How energy in fan is conserved?
Fan power requirements are a function of the CFM (cubic feet per minute) to the cube power. Fan hp = (cfm)3. If a fan at 10,000 CFM uses 10 hp (horsepower), then that same fan running at 9,000 CFM will use (0.9 x 0.9 x 0.9 x 10 hp) = .72 x 10 hp = 7.2 hp - in theory. A electronic variable speed drive (VFD) is the best choice of system to operate a fan at different speeds. In practice there are certain mechanical losses within the entire fan system that reduce the efficiency such that a 10% reduction may be closer to 7.5 or 7.8 hp. Nevertheless, given that ALL fans for HVAC applications are sized for the worst conditions (usually the warmest day of the year), virtually all can operate at 90% output, and usually much less, for most of the year. A fan variable speed drive is the single most important energy saving measure possible with almost all heating and air conditioning applications.
If 3 ounce weight is on a 15 inch fan rotating at 900 rpm so What is the force on the fan blade in pounds?
You havent mentioned the location of the weight. Insufficient information for the calculation.
Why does a fan has odd number of wings?
A fan does not have to possess an odd number of blades. The can have any number from two on up. Ceiling fans typically have 3 to 5 blades, with four being extremely common.
What is a fire suppressant used for?
A fire suppressant is used to remove one of 3 things from a fire. Depending on what the suppressant is, it operates by removing ONE of the 3. IE: CO2 works by removing the OXYGEN from the fire, water works by removing HEAT, and something like a fire fighting foam works by removing heat and the FUEL, by causing a blanketing action between flame and the fuel.
How an electric fan works?
Ceiling fans spin rapidly, pushing air around and creating wind to make you feel cooler. Wind is moving air, and helps perspiration. Actually, the fans don't cool the room down. In fact, since motors generate heat by using energy, they warm the room up gradually. That means that fresh air is needed.
What is wrong if the only air condition setting that works is high4 1-3 doesnt even blowand the AC light doesnt come on It will only blow on the highest setting Any Ideas?
You may have a faulty switch that controls the speeds on the a/c blower fan.
Why does my Rover 25 fan heater only works on 3 and 4 but does not work on the lower speeds?
The stage 1 relay has blown! it is located behind the glovebox door above the heater blower. # find it # pull it out # replace it job done:-)
2002 Chevy silverado fan blower only runs on speeds 3 4 and 5 where is the relay located?
Its not the relay, it is the blower motor resistor.
If you have a 92 jeep wrangler heater and ac are separate how many speeds is the ac fan not the heater?
I had one of these on a 1991 Wrangler and if I remember correctly it had 3 speeds. i currently have a 92 and it dose have 3 speeds
Why would a 1998 Honda Civic AC blower only work on settings 3 and 4?
I've had a similar problem on my 98 civic ex. There's two resistors wired to the fan control. One for speeds 1 and 2 and another for speeds 3 and 4. I suspect the one controling the 1 and 2 speeds has blown.
Fan control switch on a Ford Festiva 1995 works in position 3 but not 1 or 2 fuses or contacts worn?
Could be switch Could be low speed relay Could be low speed winding on fan motor Could be fan motor resistor Uses 2 relays (one for High speed and other for lower speeds Motor has 2 windings one for High speed and otheer for lower speeds
What would be the cause of your heat only working sometimes in your Hyundai Elantra when you can hear the switch clicking when you turn it?
Possibly a fan resistor. Does it work on only certain speeds like 1 and 2 but not 3 and 4?
Grand prix fan blower only works on high?
u need a new control button switch the button that has 3 nobs on it that control temp .i had same problem only works on 5 right.
How do you repair an air conditioner on a 1996 Nissan Sentra that only works on level 4 and nothing happens on levels 1 2 and 3?
A resistor block controls the speed of the AC/Heater fan. These resistors are switched on and off in various combinations to create the different fan speeds. When the resistors burn out, your fan will only work on the "HI" setting. The "HI" setting doesn't use any of the resistors and that's why it works. These resistors are near the blower and the blower is beneath the dashboard on the pasenger side. A/C is probably fine. If you try the heater, it will show the same problem as your question.
2003 Chevy sivlerado heater blower quit working on speeds 1 2 only works on 3-5 whats the problem?
The blower motor resistor is bad.
What would cause the heater fan rear defroster to not work on a 1991 Chevy caprice the heater fan only works on the highest setting?
If the heater fan on your 1991 Caprice only works on "High" the problem is more than likely the resister assembly in your blower circuit or poor connections at the resister assembly. When the switch is in the "high" position the current does not flow through the resister assembly it flows directly to the coil of the blower relay. When the switch is in "low", "medium 1", or "medium 2" position the current flows through 1, 2, or all 3 of the resistors in the resistor assembly which results in the 3 different lower speeds. Check the resister assembly and replace if needed.
Why does the heater fan only works when the switch is in the high position of your 2002 Chevy prism not the first 3 positions?
replace the blower fan resistor located under the dash behind the glove box
