A cogeneration system consists of an engine and a boiler, both working with naturalgas. Heat is recovered from the exhaust gases, from the lubrication oil and from theengine cooling water; nonetheless there is the need of further heat from a boiler. Thesystem provides 80 kW of electrical power of 200 kW heat.Calculate :a) Draw a diagram of the facility, indicating the energy flow in each component. b) The ratio heat / work from the engine. c) The Energy Utilization Factor of the power supply system d) The volumetric flow rate of gas (m3/hr) required to power the engine and the boiler. e) What are the annual savings in euros, from this cogeneration system? Data: Calorific value of natural gas 38MJ/m3 Mechanical efficiency of the engine: 35 % Alternator efficiency: 95 % Efficiency of the boiler: 85 % Thermal energy recovered from the engine: 62 % of total energy rejected by the engine. Total annual electricity produced by the system: 500 MWhe Unit cost of gas = 0.01 € / kWh Unit cost of electricity = 0.06 € / kWhe
A cogeneration system consists of an engine and a boiler, both working with naturalgas. Heat is recovered from the exhaust gases, from the lubrication oil and from theengine cooling water; nonetheless there is the need of further heat from a boiler. Thesystem provides 80 kW of electrical power of 200 kW heat.Calculate
:a) Draw a diagram of the facility, indicating the energy flow in each component.
b) The ratio heat / work from the engine.
c) The Energy Utilization Factor of the power supply system
d) The volumetric flow rate of gas (m3/hr) required to power the engine and the boiler.
e) What are the annual savings in euros, from this cogeneration system?
Data:
Calorific value of natural gas 38MJ/m3
Alternator efficiency: 95 %
Efficiency of the boiler: 85 %
Thermal energy recovered from the engine: 62 % of total energy rejected by the engine.
Total annual electricity produced by the system: 500 MWhe
Unit cost of gas = 0.01 € / kWh
Unit cost of electricity = 0.06 € / kWhe
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