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What exactly meaning of a fan coil unit's static pressure?
Fan coil units don't have inherent static pressures, but it has to overcome the static pressures when it will be ducted to a system. Static pressure and pressure losses however can be determined accordingly in ducts. The designer sizes up the ducts to overcomes this losses and give the fan's output to the point of application sizing the duct to overcome frictional losses as much as it could to meet the space requirements cooling load. This value is the amount of resistance the fan will be able to overcome within the system it is ducted to and still be able to provide the designed air flow. For example if your fan coil unit is ducted on the supply side and the total frictional resistance of the ductwork and diffuser is below that of the fan coil units static pressure you won't have a problem. If on the other hand, the frictional resistance is greater, you won't see the design air flow at the diffuser. In general you can calculate a system's resistance with the following rules of thumb: 0.1"/100ft of duct, 0.1" per elbow, 0.1" at the diffuser. The fan will probably rated between 0.3" & 0.7" of water gauge.
How FD and ID fan control the air flow?
FD or Forced Draft Fans supply combustion air to the boiler. Different combustion controls demand a supply of combustion air in different ways but what they have in common they control the FD fan to provide enough air for complete combustion in the boiler furnace. In most systems in use today the ID or Induced Draft fan sucks the products of combustion from the boiler furnace, through the various passes of the boiler and pushes it out the chimney. How much or how fast this fan works is based on furnace pressure. The ID fan control set point is based on combustion side furnace pressure. If the furnace pressure goes up the ID fan removes more air to lower the pressure. As the furnace pressure goes down the ID fan removes less air. This air flow out of the boiler is referred to as draft. Both the FD and ID can be controlled by various means. The air flow can be restricted in the plenum or ducts by dampers or louvers or the speed of the fan can be changed by mechanical means from a fixed speed driver. Also the speed of the fan can be changed by the use of a variable steam turbine or an electric motor with VFD (Variable Frequency Drive)
Is forced draft has negative pressure drop?
No, the forced draft fan has positive pressure as it just forces yhe air into the combustion chamber.only the induced draft fan has negative pressureas it removes the flue gases & exhaust gases is stacked up
Four methods for controlling head pressure in an aircooled condenser are?
fan cycling.3 way modulating valve
What causes high head pressure in an air cooled condenser?
It is due to pressure rising due to a bad condenser fan motor, bad capacitor, obstructing of airflowat the condenser, or a dirty condnser.
How do you change my own serpentine belt?
Take off fan shroud and fan. Loosen belt tensioner. When you take of belt remember how it went on and just replace.
How much to replace a fan belt in 1995 Toyota Camry?
There is no fan belt in a 95 Camry
How much does it cost to replace a fan belt on a doge neon?
It cost nothing. There is no fan belt.
How do you change fan belt on 2002 Toyota Tacoma?
take the fan belt off and put another one on...
How do you take off fan-belt on Lincoln Ls?
There is no fan belt.The fan is hydraulically controlled.Are you asking about the main drive/accessory belt?
How do you change fan belt on a Mercedes?
Take it to a mercedes garage
If the fan belt sticks or brakes what do you do?
Take it to the repair shop and replace it.
How do you tighten the fan belt on a holden rodeo 2000?
The fan belt on a 2000 Holden Rodeo is tightened by loosening the tensioner and using a pry bar to apply pressure. The bolt is then tightened to maintain the tension.
How do you change an alternator belt on a 1985 impala?
loosen altinator, loosen smog pump, take smog pump belt loose, then take altinator belt over smog pump belt and over fan
How do you tighten fan belt on Volvo 940 1991?
take it to a garage and get if fixed
What is the fan belt routing on a 1993 Chrysler lebaron 3.0L?
There is no fan belt it is an electric fan. Are you referring to the serpentine belt?
How to put on fan belt on 1993 Chevrolet pickup 305?
You have to take off the alternator to be able to reach the fan . After you should oiul the belt to slip on the fan very easy . Put the alternator back on and your ready to go .
