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Cooling ceiling
Water-carrying cooling ceilings can be used as a supplement, if cooled-air temperature regulation systems are insufficient. The cooling effect is primarily achieved through the absorption of heat, with convection being a secondary function.
Cooling surface
A cooling surface is used for cooling of outside air before injection into the building. A cooling surface can be an integrated part of an AHU or placed directly in an air injection duct.
Cooling tower
A cooling tower is used to remove excess heat from an air-conditioning system if the heat cannot be utilised for another purpose.
COSP (Coefficient of system performance)
The COSP of a heat pump is based on the total heat extracted (also referred to as Q) in relation to the energy supplied to the heat pump (also referred to as W).
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.
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.
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.
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.
Direct boosting
When a booster system is connected directly to the water mains it is called direct boosting.
Discharge de-superheater
A discharge de-superheater can be used in a cooling plant to produce domestic hot water. This is possible when there is a simultaneous demand for both cooling and hot domestic water in the building.