Brayton Cycle Efficiency Calculator

How can the Brayton Cycle Efficiency Calculator help you? This tool facilitates engineers and students by providing a more convenient way of calculating essential parameters in the Brayton cycle, commonly observed in gas turbines. It allow you to find out the cycle efficiency, compression ratio, specific heat ratio, and turbine inlet temperature based on the required level of detail.

Brayton Cycle Efficiency Calculator

Enter any 2 values to calculate the missing variable

How To Calculate brayton cycle efficiency

What is Brayton Cycle Efficiency?

Brayton Cycle Efficiency refers to the efficiency of a theoretical thermodynamic cycle that describes the functioning of gas turbines. It measures how effectively the cycle converts input energy into useful work output.

How to Use the Calculator

Using the Brayton Cycle Efficiency Calculator is straightforward:

  1. Basic Calculator:

    • Enter any two of the following values: Compression Ratio (r), Specific Heat Ratio (k), or Cycle Efficiency (%).
    • The calculator will compute the missing value based on the inputs provided.
  2. Advanced Calculator:

    • Provides an option to calculate Advanced Cycle Efficiency considering Turbine Inlet Temperature (T), in addition to Compression Ratio (r) and Specific Heat Ratio (k).
    • This advanced feature accommodates more detailed analyses relevant in engineering applications.

Calculation Formula

The formula used in the calculator is:

η=1r(1k)\eta = 1 – r^{(1 – k)}


η\eta –is the Brayton cycle efficiency (%)
rr– is the compression ratio
kk– is the specific heat ratio (Cp/Cv)

Example Calculation

Let’s demonstrate how the calculator computes values using the formula:

1. Basic Calculation Example:


r=10r = 10


k=1.4k = 1.4


η\e:η=110(11.4)\eta = 1 – 10^{(1 – 1.4)}
η=1100.4\eta = 1 – 10^{-0.4}
η10.3981\eta \approx 1 – 0.3981
η0.6019\eta \approx 0.6019
η60.19%\eta \approx 60.19\%


2. Advanced Calculation Example:

Foe Example

r=15r = 15, k=1.35k = 1.35

and T=1200T = 1200


Compute Advanced Cycle Efficiency:

Adjust for temperature influence (assuming a simple factor):

Efficiency Increase Factor=1+(T1500)\text{Efficiency Increase Factor} = 1 + \left( \frac{T}{1500} \right)

Calculate Advanced Efficiency:

ηadvanced=(115(11.35))×Efficiency Increase Factor×100\eta_{\text{advanced}} = \left( 1 – 15^{(1 – 1.35)} \right) \times \text{Efficiency Increase Factor} \times 100


What is the Compression Ratio in the Brayton Cycle?

Compression Ratio (r) is the ratio of the volume of air before compression to the volume after compression in the Brayton cycle.

How is cycle efficiency affected by the variation of the Specific Heat Ratio (k)?

The value of the Specific Heat Ratio (k) determines the ratio of the heat capacity of gases in the Brayton cycle, changing the efficiency during thermodynamic processes.

What role does Turbine Inlet Temperature play in the Advanced Calculator?

Turbine Inlet Temperature (T) affects the efficiency of the cycle.


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