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Cross flow heat exchanger
A cross-flow heat exchanger exchanges thermal energy from one airstream to another in an air handling unit (AHU). Unlike a rotary heat exchanger, a cross-flow heat exchanger does not exchange humidity and there is no risk of short-circuiting the airstreams.
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. This means that the water content in the air changes states from gas to liquid.
Diaphgram tank
The volume of the water in a pipe system will vary depending upon its temperature. An expansion tank is used to ensure the absorption of excessive volumes of 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.