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.
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:

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.

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:
$\eta = 1 – r^{(1 – k)}$
Variables:
$\eta –$
– is the Brayton cycle efficiency (%)
$r$
– is the compression ratio
$k$
– is the specific heat ratio (Cp/Cv)
Example Calculation
Let’s demonstrate how the calculator computes values using the formula:
1. Basic Calculation Example:
Suppose
$r = 10$
and
$k = 1.4$
Calculate
$\e$
:
$\eta = 1 – 10^{(1 – 1.4)}$
$$ $\eta = 1 – 10^{0.4}$
$$ $\eta \approx 1 – 0.3981$
$\eta \approx 0.6019$
$$ $\eta \approx 60.19\%$
2. Advanced Calculation Example:
Foe Example
$r = 15$
,
$k = 1.35$
and
$T = 1200$
Kelvin.
Compute Advanced Cycle Efficiency:
Adjust for temperature influence (assuming a simple factor):
$\text{Efficiency Increase Factor} = 1 + \left( \frac{T}{1500} \right)$
Calculate Advanced Efficiency:
$\eta_{\text{advanced}} = \left( 1 – 15^{(1 – 1.35)} \right) \times \text{Efficiency Increase Factor} \times 100$
FAQs