HVAC and BEMS

Ability of a circuit system to store electricity.  The capacitance of a capacitor is measured in farads and is determined by the formula C = q/V, where q is the charge (in coulombs) on one (1) of the conductors and V is the potential difference (in volts) between the conductors.  The capacitance depends only on the thickness, area, and composition of the capacitor's dielectric.

A colourless, odourless non-combustible gas with the formula CO2 that is present in the atmosphere.  It is formed by the combustion of carbon and carbon compounds (such as fossil fuels and biomass), by respiration, which is a slow combustion in animals and plants, and by the gradual oxidation of organic matter in the soil.

Arrangement in which two (2) or more refrigerating systems are used in series.

Space between the flooring and above the suspended ceiling that accommodates the mechanical and electrical equipment and that is used as part of the air distribution system.  The space is kept under negative pressure.

See Air Conditioner

This is the same as an Air Handling Unit but serves more than one (1) area.

In HVAC, a system where heat is supplied to areas of a building from a single appliance through a network of ducts or pipes.

The amount of refrigerant in a system.

To add a charge of refrigerant to a system.

A mechanical device normally applied to a piping system which allows fluid to flow in only one direction.