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Decommissioning and disposal costs (Cd)
In the context of life cycle cost, decommissioning and disposal costs are non-existent or modest in commercial building systems.
Decomposition
Decomposition is the breakdown or degradation of complex organic substances into simpler substances by chemical or biological processes.
Degree day
Degree Days are a measure of how cold (or hot) it was over a period of time, and correspondingly how much energy is needed for heating (or cooling) a building.
Detention tank
A detention tank is an artificial flow-control structure that is used to contain stormwater and wastewater for a limited period of a time.
Dew point
The dew point temperature is the temperature where the water content in the air condenses into water.
Diaphragm Tank
Diaphragm tanks are pressurized water vessels where the water and air are separated by a flexible diaphragm allowing the water to expand and absorb pressure surges.
Differential pressure regulating valve
Differential pressure regulators are built into the system where a constant differential pressure is desired.
Direct boosting
When a booster system is connected directly to the water mains it is called direct boosting.
Direct system
A direct system is a heating system where the heat emitters are directly connected to a boiler or district heating system.
Discharge de-superheater
A discharge de-superheater can be used in a cooling plant to produce domestic hot water.