Combined Cycle Efficiency Calculator
Ideal combined cycle accountingηtop+(1−ηtop) recovered fractionηbottom; independent compatible energy denominators/auxiliary losses external. Actual independently established compatible SI units/model context; conditional arithmetic, not code compliance, engineering design or safe operation approval.
Description
An ideal combined-cycle balance depends on compatible top-cycle, recovery and bottom-cycle efficiency definitions.
An ideal combined-cycle balance depends on compatible top-cycle, recovery and bottom-cycle efficiency definitions.1
This tool combines supplied fractions without estimating auxiliary losses or actual plant performance.
When to use Combined Cycle Efficiency Calculator
Use this tool to combine supplied fractions without estimating auxiliary losses or actual plant performance.
How to use Combined Cycle Efficiency Calculator and how it works
- Prepare topCycleEfficiency, independentlyEstablishedRecoverableBottomFraction, bottomCycleEfficiency, with the units, conventions and assumptions below.
- Enter the required fields and run Combined Cycle Efficiency Calculator.
- Read result.value using the output definitions below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| topCycleEfficiency | Top Cycle Efficiency. Use the units and matching context stated in the calculation below. | number | Required; fraction from 0 to 1; finite; other constraints below |
| independentlyEstablishedRecoverableBottomFraction | Independently Established Recoverable Bottom Fraction. Use the units and matching context stated in the calculation below. | number | Required; fraction from 0 to 1; finite; other constraints below |
| bottomCycleEfficiency | Bottom Cycle Efficiency. Use the units and matching context stated in the calculation below. | number | Required; fraction from 0 to 1; finite; other constraints below |
Supply topping efficiency, recovered fraction of the remaining heat and bottoming efficiency, all between zero and one inclusive. Return toppingEfficiency+(1-toppingEfficiency)*recoveredFraction*bottomingEfficiency. This simplified accounting requires a consistent common energy basis.
combinedEfficiency=topEfficiency+(1-topEfficiency)*recoveryFraction*bottomEfficiency Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Dimensionless conditional combined-cycle efficiency. | number |
{
"input": {
"topCycleEfficiency": 0.4,
"independentlyEstablishedRecoverableBottomFraction": 0.5,
"bottomCycleEfficiency": 0.3333333333333333
},
"output": {
"result": {
"value": 0.5
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Turbine Work Calculator for a complementary operation: Steady turbine power can be estimated from mass flow and a signed specific-enthalpy drop under a restricted energy balance.
Use Compressor Power Calculator for a complementary operation: A restricted adiabatic compressor balance uses mass flow, matched heat capacity and observed temperature rise.
References
-
Combined Cycle Efficiency Calculator — tool.io
Similar or alternative tools
- Turbine Work Calculator
Steady turbine power can be estimated from mass flow and a signed specific-enthalpy drop under a restricted energy balance.
- Compressor Power Calculator
A restricted adiabatic compressor balance uses mass flow, matched heat capacity and observed temperature rise.