Centrifugal compressor efficiency calculation pdf

1. How do you calculate the efficiency of a compressor?
2. What is compressor efficiency?
3. How do you calculate the kW of a compressor?
4. Which compressor has highest efficiency?
5. How do you calculate the power consumption of a compressor?
6. What is adiabatic compressor efficiency?
7. What is pressure ratio in centrifugal compressor?
8. What is pressure coefficient in centrifugal compressor?
9. What is the difference between adiabatic and polytropic efficiency?
10. What is isothermal efficiency of a compressor?

How do you calculate the efficiency of a compressor?

Simple Energy Formula: Motor Efficiency = Cost per KW X . 746 (Power Factor) X Hours of operation X Brake horsepower *Note: No electric motor is 100% efficient, most will average 92-95% efficient.

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.

How do you calculate the kW of a compressor?

The efficiency of the compressor must be taken into consideration and is equal to 0.72 which gives a required power of 156*0.72 = 216.8 kW.

Which compressor has highest efficiency?

The most energy efficient air compressor is a two-stage double acting compressor.

How do you calculate the power consumption of a compressor?

This trim compressor would be 45% loaded (186/414= 45%). At the 600 cfm level the kWh for the fully loaded base compressor is calculated as follows: For the trim: Specific power at 45% load would be 33.6 kW/100 cfm (from Figure 3 the unit consumes 72% of full load power at 45% which is 1.6 times the full load sp).

What is adiabatic compressor 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.

What is pressure ratio in centrifugal compressor?

A multistage centrifugal compressor (i.e., a machine with multiple stages) can achieve, with natural gas, a pressure ratio of about 4–5, which equates to about 70,000–90,000 ft lb/lb of head. The temperature rise resulting from this amount of head is usually a limiting factor.

What is pressure coefficient in centrifugal compressor?

Centrifugal compressors are usually designed in the flow coefficient range = 0.01 to 0.16. ... Figure 1 shows the typical application area of various compressor impellers and the typical areas where most industrial radial impellers are designed.

What is the difference between adiabatic and polytropic efficiency?

The key difference between adiabatic and polytropic processes is that in adiabatic processes no heat transfer occurs whereas in polytropic processes heat transfer occurs. ... The exchanged energy can take several forms such as light energy, heat energy, sound energy, etc.

What is isothermal efficiency of a compressor?

A measure of the performance of a reciprocating air compressor. It is expressed as a ratio of the isothermal work input to the actual work input. ... Isothermal compression is an ideal case since none of the work input is absorbed in raising the temperature of the compressed air, i.e. in raising its internal energy.... ...