Cogen turbine heat rate is the amount of heat energy required by a cogeneration system to generate one unit of electrical energy. It is generally expressed in kcal/kWh or kJ/kWh. A lower heat rate indicates better energy efficiency, meaning less heat energy is required to generate each unit of electricity.
What are the Inputs required for the Calculation of Cogen Turbine Heat rate calculation?
- Turbine inlet steam flow in TPH
- Turbine inlet steam pressure and temperature
- Bleed steam flow
- Bleed steam pressure and temperature
- Extraction steam flow
- Extraction steam pressure and Temperature
- Exhaust steam flow
- Exhaust steam pressure
Co-gen-THR =((Turbine inlet steam flow X its Enthalpy)-(Process steam flow X Enthalpy Exhaust steam flow X Enthalpy)) / Power generation
Steam Turbine Co-generation Heat Rate Calculator
1. Turbine Inlet Steam Conditions
2. Process Steam / Extraction / Bleed Conditions
3. Turbine Exhaust Steam Conditions
4. Turbine Power Generation
Calculation Results
Co-gen THR = [(Turbine Inlet Steam Flow × Inlet Enthalpy) − Σ(Process / Extraction Steam Flow × Extraction Enthalpy) − (Turbine Exhaust Flow × Liquid Enthalpy at Exhaust Pressure)] ÷ Power Generation
Important: Exhaust enthalpy is considered as saturated liquid enthalpy (hf) based on exhaust pressure. Exhaust temperature is not used for exhaust enthalpy calculation.


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