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# (Solved): Measurements Assume a natural gas higher heating value of $$38.6 \mathrm{MJ} / \mathrm{m}^{3}$$. ...

Measurements Assume a natural gas higher heating value of $$38.6 \mathrm{MJ} / \mathrm{m}^{3}$$. Calculations Draw a 'heat (and mass) balance' diagram' and a 'Sankey' diagram' for the CHP unit. Calculate the net electrical and thermal efficiencies and hence determine the overall efficiency, the heat-to-power ratio and the air-fuel ratio. $${ }^{1}$$ UK Microgeneration Part II: Technology Overviews, Proceedings of the ICE - Energy, November 2010 2 "Heat (and mass) balance" diagram reports pressure, temperature and mass flow rate for each state point. $${ }^{3}$$ Sankey diagrams are a specific type of flow diagram, in which the width of the arrows is shown proportionally to the flow quantity (i.e. energy). Sankey diagrams are typically used to visualise energy transfers between processes.

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