Table of Contents
How does induced draft fan work?
An induced draught fan (ID fan) is provided to maintain a negative pressure in the furnace by sucking the products of combustion from it with a slight positive pressure at the discharge end vis-à-vis the bottom of the chimney/stack.
What do discharge dampers do?
A damper is a valve or plate that stops or regulates the flow of air inside a duct, chimney, VAV box, air handler, or other air-handling equipment. A damper may be used to cut off central air conditioning (heating or cooling) to an unused room, or to regulate it for room-by-room temperature and climate control.
Which way should a centrifugal fan turn?
Centrifugal fans can in general turn in both directions. The performance of the fan may however not be identical for both directions. Centrifugal fans can only blow air radially outwards.
What type of fan and blades are used for induced Draught fans?
Induced Draft Fans. Forced Draft Fans: Forced Draft fans used in a power plant are centrifugal fans, utilizing radial airflow blading or variable pitch axial fans. Forced Draft Fans (FD) supply the air necessary for fuel combustion by pushing air through the combustion air supply system and into furnace.
Why induced Draught considered better than forced Draught?
By what is natural draught produced?…
| Q. | Why is induced draught considered better than the forced draught? |
|---|---|
| B. | maintenance of induced draught fan is costlier |
| C. | forced draught is less efficient |
| D. | forced draught produces less amount of speed of air |
| Answer» a. because power requirement is high for forced draught |
What are Fan dampers and how do they work?
The fan & motor speeds remain constant. There are (2) main types of dampers and they adjust fan capacity with different system effects: Inlet Vane Damper (VIV) – installed on the inlet of the fan and swirls the air in the same direction as the fan rotation. They are commonly modulated with electric or pneumatic actuators.
Can a fan run with a closed suction damper?
The vent line is a closed system except for a number of relief valves that will vent into it in a emergency. Thus the problem is that the fan will run most of is lifetime with a “closed” suction damper. Can fans operate like this? Can you add pressure switches upstream of the relief valves set to a pressure just under the relief valve setting?
Do I need A VFD or outlet damper?
Power consumption can be reduced, though not as much as with a VFD. Outlet Damper – mounted on the outlet of the fan and simply “throttles” the air leaving the fan. This damper is the least efficient option, as it increases system pressure drop as the air flow decreases. How About a VFD?
What is a barometric damper or draft regulator?
The barometric damper or draft regulating device we are discussing here is normally used only on oil-fired heating equipment, not on gas-fired equipment. On oil fired equipment the barometric damper, or draft regulator is typically a round Tee inserted in the flue vent connector between the heating appliance and the chimney.