This dialog allows you to describe a combined heat and power plant supplying heat and electrical power to the building.
As currently configured, the CHP system operates a heat matching strategy, attempting to provide the heating needs of the building while generating electricity as a by-product. The operation of the CHP plant is dependent on:
The enabling of the appropriate heating systems for CHP input.
The minimum and maximum power output of the CHP system.
The profile for heat matching.
Each heating system (Apache System, ApacheHVAC boiler or ApacheHVAC direct acting heater) must be enabled for CHP input if it is to receive heat from the CHP system. This is done by ticking the CHP box for the system in question. Next to the CHP box is a Boiler Ranking parameter which allows you to specify the order in which the boilers are switched on when the CHP system is either off or unable to meet the total heating load. Boilers with low Boiler Ranking will be switched on first. These will normally be the most efficient. Where two boilers have the same Boiler Ranking the CHP plant will contribute the same fraction of the heating load for both systems.
CHP availability and meter
CHP generator
Tick this box to specify the existence of a CHP system.
Meter
The meter supplying fuel to the CHP system.
Performance at rated output
The following properties define the performance of the generator at its rated output.
Heat output
The maximum heat output
Thermal efficiency
The thermal efficiency (heat output divided by energy content of fuel consumed) at rated output.
Power efficiency
The power efficiency (power output divided by energy content of fuel consumed) at rated output.
Performance at minimum output
The following properties define the performance of the generator at its minimum heat output.
Heat output
The minimum heat output, expressed as a fraction of the rated heat output.
Thermal efficiency
The thermal efficiency at the minimum heat output.
Power efficiency
The power efficiency at the minimum heat output.
Profiles
Profile for heat matching strategy
Select a variation profile that defines the periods when the CHP system will attempt to match the heating load. The usual setting is ‘on continuously’.
Profile for power matching strategy
This feature is not available in version 5.6. When enabled it will allow the CHP system to operate a power matching strategy and various combinations of heat-matching and power-matching.
