CHP - CIBSE Ireland

Report
By Mark Foley

Combined Heat and Power is the generation
of electricity and usable heat simultaneously
from the same fuel input.

Electricity primarily used on-site, but can be
sold back to grid.

Thermal energy used for heating/cooling or
process applications

Large Scale

Small Scale

Micro

Generation of electricity while using heat
produced.

Higher efficiency

Use of waste or byproduct fuel

On-site electric generation avoids
distribution costs (7%)

Increased reliability and power quality

Must be Simultaneous Demand for Heat &
Electricity

Large Capital & Maintenance costs.

Require back up of power and heat

Noise from CHP units

Steam Boiler/ Steam
Turbine
• Gas Turbine
Compression Engine
Spark Ignition

Spark Ignition up to 4 MW

Compression Ignition – 15 MW

Exhaust Gases around 400°C

Water or Lubricating oil Systems (70 -80°C)

Ratio of 2:1
Stirling Engine →
Summary of Prime Movers
Electrical
Output
(Mwe)
Typical
Fuels
Primary
Energy
Savings
(%)
Gas Turbine
0.5 >
Flexible
Up to 30
Steam Turbine
0.5 >
Flexible
5 to 20
Spark Ignition
Up to 4
Gas
Up to 30
Compression
Ignition
Gas/ Heavy
2 to 15
Up to 30
Fuel Oil
Up to 50
Micro Turbines
Kwe
1 to 25
Sterling Engines
Kwe
Gas
Up to 30
Flexible
Up to 20



Base load of Heat &
Power exceeding
4000 hours yearly


Base Electrical Load
Base Heating Load

Hotels
Nursing/Residential
Homes
University
Campuses




CHP can help deliver the green agenda
Development of more efficient
technologies
Buildings & Industries can reduce carbon
footprint
Still a large capital cost



Design of CHP system for the buildings
use.
Reducing CO2 emissions from buildings.
Task for BSE to design and produce
these types of efficient systems.
Questions?

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