Micro-combined Heat and Power Systems

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Micro-combined heat and power (mCHP) systems

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These systems use a fuel source to supply heating, hot water, and electricity simultaneously. They achieve similar efficiencies to condensing boilers but operate differently. Typically, 80% of the heat is used for heating, and 15% for electricity production. This is known as a 'heat-led' system.

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Micro-combined heat and power (mCHP) systems component parts

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- The engine burner - The Stirling engine generator - The supplementary burner - The heat exchanger

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Diagram of a micro-combined heat and power (mCHP) system

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Illustrates the flow of flue gases, heating flow, gas supply, and heating return in an mCHP system.

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Micro-combined heat and power (mCHP) systems: Heat Call Process

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When there is a call for heat, the burner fires and starts the Stirling generator, producing about 25% of the full heat output.

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Function of the Burner in mCHP Systems

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The burner pre-heats the return system water, and hot flue gases pass across the heat exchanger to heat the system further.

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Supplementary Burner in mCHP Systems

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If there is more demand for heat, the supplementary burner ignites.

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Operation of the Stirling Engine

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The Stirling engine uses the expansion and contraction of internal gases to operate the piston without explosive combustion.

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Water conservation is essential due to increased demands on water supply systems from population growth.

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True, as population growth increases demand on water supply systems, making water conservation crucial.

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Uses of potable water include drinking, washing, bathing, and watering gardens.

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Potable water is used for drinking, washing, bathing, and watering gardens.

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Two methods of water conservation in the UK are rainwater harvesting and greywater reuse.

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Rainwater harvesting and greywater reuse are two methods of water conservation in the UK.