What is energy flow diagram? State its significance from Energy Audit point of view.

What is energy flow diagram? State its significance from Energy Audit point of view.
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Example energy flow diagram:

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Significance of energy flow diagram: 1. Energy flow diagram, also known as Sankey diagram, is a specific type of flow diagram in which the width of the arrow is proportional to quantity of energy. 2. Length of the arrows has no bearings with the quantity of energy. 3. These diagrams indicate the flow of energy in a process and help identifying the quality and quantity of energy. 4. The input of energy begins from left of the diagram. The outputs (useful and leakages/losses of energy) are shown in diagram.

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