0
One measure of efficiency is power output/power input.
Assuming that you have in the input power to the compressor in watts, the output flow rate in liters per minute, and the output pressure in bar(absolute), then the formula for efficiency is
(V * 100 * ln (P))/Input
Where v is flow rate in liters per second referenced to atmospheric pressure, P is pressure in bar, and Input is power to the compressor in watts. This also assumes that the input air is roughly atmospheric pressure and near room temperature, and the output air has cooled back to near room temperature.
A rule of thumb is that 1 hp into a compressor will generate 4cfm at 100psi. Lets see what efficiency that is.
1 cfm = 1cu ft * 28.3 liter/cu ft * 1 minute/60 second = 0.472 liters per sec
100psig = 115psia = 7.9 bar absolute
4 cfm = 4*0.472 lps = 1.89 lps
1.89 * 100 * log-natural (7.9) = 390 watts of output power
1 horsepower = 746 watts.
390/746 = 52% efficiency
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
What is the Conclusion of air compressor?
The conclusion of and air compressor is a supply of air. The air compressor generates air that is stored in a tank.
How do you calculate free air delivery?
Free air delivery (FAD) is a standardized measure of the capacity of an air compressor. source: http://www.pneumatic-source.com/compressed_air/index.php?p=23 Mohammed
How do you calculate surge in compressor?
fool
How do you calculate cooling coil efficiency?
Calculate condenser and coils
How are air compressors different from air conditioning compressors?
Air Conditioning compressors always use in the home, it is small and cheap price, In generally, we think that air compressor is industrial air compressor, which this kind of air compressor use in factory and mining machinery, to compressed air.
How do you calculate the heat of compression for an air compressor?
enthalpy of air leaving the compressor minus enthalpy of air entering the compressor
Why is the axial flow compressor better than the centrifugal compressor?
Higher peak volumetric efficiency. You don't have to turn the air at all, so you do not lose and energy in transforming it as you compress the air.
How do you calculate air compressor capacity?
Flow rate times pressure divided by input will yield air compressor capacity. Input is another term for horsepower of the compressor. The pressure can be adjusted depending on how compact the result is to be.
Does compressor work more efficiently with an increased head pressure?
It depends on other conditions too. There is a net suction head, which is the pressure from which the compressor is drawing the gas. An increase here will often improve the compressor's efficiency. There is also a net discharge head, which is the pressure the compressor is trying to maintain. An increase here will often decrease the compressor's efficiency. There is an efficiency curve for all compressors, and they are all different based on their design, it is dependent on the differential pressure (NDH - NSH) and load (air flow in SCFM, typically) of the compressor, at a certain load the efficiency peaks then drops as the load increases.
What is the purpose of the turbine in a jet engine?
To drive the compressor section, therefore 'doing work' on the air to increase the efficiency of the combustion process.
How the efficiency of a compressor can be increased?
You can have your mom sit on it
What is the Conclusion of air compressor?
The conclusion of and air compressor is a supply of air. The air compressor generates air that is stored in a tank.
What is the poly tropic efficiency of the air compressor?
it is the eff of thermal and volumetric efforts done on compressor. the bore stroke volume and the clearance volume is isential in this. to run it most ifficiantly one should have knoladge about all
What is a cracked air compressor?
a cracked air compressor
What is air con compressor?
air conditioning compressor
If you raise your cars air conditioner to a higher temperature will you use less gas than if you keep it cooler?
The gas efficiency of a vehicle is determined by how much power is being used. The air compressor is what affects the gas mileage. The hard the compressor works the more gas a car will use. If the compressor is on the gas economy will go down.
In an air compressor the compression takes place at a constant internal energy and 50 kj of heat are rejected to the cooling water for every kilogram of air Calculate the work input for the compre?
Q1 In an air compressor the compression takes place at a constant internal energy and 50Kj of heat are rejected to the cooling water for every Kilogram of air. Calculate the work input for the compression stroke per kilogram of air?
