What efficiency does CHP achieve?

CHP total efficiency: 70–90% (heat + electricity combined). Gas engine CHP: 35–45% electrical, 40–50% heat. Steam turbine CHP: 20–35% electrical, 45–65% heat. Combined vs separate generation: CHP saves 15–40% of primary energy.

What is the power-to-heat ratio of CHP?

Gas engine CHP: typically 0.5–1.0 (kWe per kWth). Higher ratios suit applications with more electricity demand (offices). Lower ratios suit heat-intensive applications (district heating, industrial processes).

When is CHP economically viable?

CHP economics depend on the spark spread (electricity price minus gas price × heat rate). Positive spark spreads >$40/MWh typically make CHP viable. The bigger the heat demand, the better.

Combined Heat and Power (CHP) Efficiency Calculator

Calculate CHP system overall efficiency, electrical efficiency, heat recovery rate, and power-to-heat ratio. Compare to separate generation alternatives.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the scenario you are assessing. Calculate CHP system overall efficiency, electrical efficiency, heat recovery rate, and power-to-heat ratio. Compare to separate generation alternatives. Use the chp efficiency result to inform your calculation.

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Frequently Asked Questions

What efficiency does CHP achieve?

What is the power-to-heat ratio of CHP?

When is CHP economically viable?