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Exfiltration
Exfiltration refers to the leakage of wastewater into soil and groundwater through faulty joints, damaged pipes, around manholes, etc.
Expansion
Expansion is an expression used in a cooling plant. It relates to the temperature and the process that brings the refrigerant from the condenser side to the evaporator side in the cooling plant.
Expansion of fluid
When a liquid is heated it expands, i.e. its density falls as temperature increases. The temperature of a liquid in a heating system will vary significantly over time.