Differences between basic definitions for compressors and turbines

• Urmi Roy
In summary, turbines and compressors have differences in the way they are studied, including efficiency calculations, pressure ratios, efficiency types, and use of reheating or preheating. While turbines extract energy and deliver work, compressors require energy and increase fluid pressure. The differences in efficiency calculations are due to the different methods of operation for the two machines.
Urmi Roy
While making a comparative study between turbines and compressors, I noticed some differences between the way they are studied...pleasehelp me understand why these differences exist...

1. Efficiency for a turbine = (actual work/ideal work) whereas for compressors, it is (ideal work/actual work).

2. pressure ratio for turbines: (P1/P2) whereas for compressors, it is (P2/P1).

3. We use total to static efficiency in turbines whereas we use static to static efficiency in compressors.

4. Reheating is carried out for turbines whereas preheating is carried out for compressors.

5. Polytropic efficiency of turbine is ((n-1)/n)*(γ/(γ-1)) whereas it is the reciprocal for compressors.

I received these answers from a friend but they don't seem right...

...especially for the first question,it doesn't make sense as efficiency for both machines are defined in terms of ideal and actual work...

"1. Turbine delivers work, while compresor requires work.

2. Turbine extract energy by decreasing the pressure, while compressor increase fluid pressure.

3. This because turbines deliver works by decreasing total pressure to certain static pressure, without its dynamic velocity. While compressor requires energy to achieved total pressure at the outlet.

4. Reheat for turbine increases effiicency by deliver more works. In compressor usually use intercooler, not preheater to increase efficiency."

1. What is the main difference between compressors and turbines?

The main difference between compressors and turbines is their function. Compressors are used to increase the pressure of a gas, while turbines are used to convert the energy from a moving fluid (gas or liquid) into mechanical energy.

2. Are compressors and turbines classified as the same type of machine?

No, compressors and turbines are not classified as the same type of machine. While both involve the movement of fluids, they have different purposes and operate in opposite directions.

3. Can compressors and turbines be used interchangeably?

No, compressors and turbines cannot be used interchangeably. They are designed for specific functions and using them interchangeably can result in damage to the machine or failure to achieve the intended outcome.

4. How are compressors and turbines similar?

Compressors and turbines are similar in that they both involve the movement of fluids and use similar principles of thermodynamics. They also both play important roles in various industries such as power generation and oil and gas production.

5. What are some common types of compressors and turbines?

Some common types of compressors include centrifugal compressors, reciprocating compressors, and rotary screw compressors. Common types of turbines include steam turbines, gas turbines, and hydraulic turbines.

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