How to use the heat engine work and heat rejected calculator
Find work and exhausted heat given input heat and efficiency. Enter heat input, efficiency in the fields above; the work output, heat rejected are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- Qh — Heat input (kJ)
- eff — Efficiency (%)
Worked example
With heat input = 1000 kJ, efficiency = 35 %, the calculator gives work output ≈ 350 kJ; heat rejected ≈ 650 kJ.
Frequently asked questions
What is the formula for the heat engine work and heat rejected calculation?
Work output (kJ) = Qh × eff / 100. Heat rejected (kJ) = Qh-[Work output]. Here Qh is heat input (kJ), eff is efficiency (%).
What inputs do I need for the heat engine work and heat rejected calculator?
You need heat input in kJ, efficiency in %. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.