In double acting air compressor, air is admitted alternatively to both sides of the piston. If the air is cooled to temperature equal to the temperature of air at the inlet of the Ist stage cylinder, the inter-cooling is complete. The energy from the impeller is transferred to the air as the air flows through the machine and the pressure rise is primarily due to dynamic effects.
According to the design and principles of operation Reciprocating compressor Rotary compressor According to the action Single acting compressor Double acting compressor According to the number of stages Single stage compressor Multistage compressor According to the pressure limit Low pressure compressor Medium pressure compressor High pressure compressor According to the capacity Low capacity compressor Medium capacity compressor High capacity compressor 3. Define the mechanical efficiency of a reciprocating air compressor Mechanical efficiency of the reciprocating air compressor is defined as the ratio between theoretical or indicated power required to the driving power required or actual power supplied to the compressor. Discuss the effect of clearance upon the performance of an air compressor i) The volumetric efficiency of air compressor increases with decrease in clearance of the compressor.
The multi stage compression as compared to single stage compression……. A.Improves volumetric efficiency for the given pressure ratio. Compression efficiency is compared against……. A.Ideal compression. C.both isothermal and adiabatic compression.
To offer pressures higher than standard 100 psig in a fixed speed, direct coupled drive air compressor, the compressor element must be. Choosing an air receiver that is smaller than the flow doesn’t make sense, because you will not have the necessary air to meet the needs of your system or end use. An air receiver with a capacity equal to demand isn’t a bad idea, but applications with variable demand may experience an increase in demand that the air receiver cannot accommodate.
air compressor questions and answers pdf Related Question:
What are the four main parts of an air compressor?
They consist of a piston, connecting rod, crankshaft, cylinder, and valve head. The air is compressed in the following manner: The valve head at the top of the compressor tank draws air in by the downward movement of the piston in the cylinder.
What is the function of air compressor Mcq?
What is the function of the air compressor? Explanation: Air compressor is a machine which draws the air from the atmosphere, compresses it to increase the pressure and delivers the high pressure compressed air to the air receiver tank.
What are the 3 Classification of air compressor?
There are 3 styles of air compressor commonly found in mobile industrial applications: Reciprocating, Piston Compressors. Rotary Screw Compressors. Rotary Vane Compressors.
What is the head of a compressor?
The compressor head is one of the vital components of your compressor. In conjunction with the compressor’s motor, it is the enginethat drives the entire mechanism. When it comes to the repair of this key piece, only trust high-quality products and experienced technicians, like the ones at Compressed Air Systems.
Is air compressor part of engine?
On most cars, A/C compressors are driven by an engine-accessory belt. If the belt is worn and slips, the compressor won’t operate at full strength. Compressors can also leak refrigerant, resulting in less cold air going into the interior. Internal parts can also fail, leading to no cold air.
How many terminals are in a compressor?
Three terminals should be from inside the compressor if the unit is single phase or three phase. The terminals will be marked C common, S start, and R run on a single-phase unit or T1, T2, and T3 on a three-phase unit.
Which motor is used in compressor?
Most air compressors operate using standard, three-face induction motors. They are typically powered by electricity, diesel or natural gas. Electric motors are reliable, economical and capable of generating enough power for standard use at home or around your workshop or garage.
Which compressor has highest efficiency?
The most energy efficient air compressor is a two-stage double acting compressor. The power of specific power is between 15 and 16 kilowatts.
Do compressors increase pressure?
A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. Compression of a gas naturally increases its temperature. Compressors are closely related to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe.
What is the refrigerant number of water?
Water is also one of the many available refrigerants, having its own unique properties and refrigerant number (R718).
How will you measure the compressor capacity?
This means how much volume of compressed air can be generated by an air compressor when it has run for a particular amount of time. This unit is exactly measured as volume of air upon time. Eg: CFM (Cubic Feet per Minute) – Cubic Feet is a unit of volume and minutes is a unit of time. 1 cubic foot is = 28.317 Liters.
What is a continuous air compressor?
Continuous duty air compressors are designed to run for longer periods of time. They are ideal for air tanks, air horns, low riders, air tools and other situations where you have a frequent demand for air.
What is compressor efficiency?
The compression efficiency is the ratio of the work required to adiabatically compress a gas to the work actually done within the compressor cylinder as shown by indicator cards (Figures 18-12 and 18-16). The heat generated during compression adds to the work that must be done in the cylinder.
What is the adiabatic efficiency?
Adiabatic efficiency is defined as the ratio of work output for an ideal isentropic compression process to the work input to develop the required head. For a given compressor operating point, the actual or predicted isentropic efficiency can be calculated with Eq.
Is compressor adiabatic?
The fact that in compressor couple with the volume reduction of gas a rise in temperature clearly is an indication of the existence of an adiabatic process + entropy reduction, therefore compression of gas is approximated as an adiabatic isentropic process.
