Adiabatic cooling | | The process of cooling air by adding humidification. |
Air volume | | Rate of airflow, normally expressed in cubic feet per minute (cfm) or cubic meter per hour (cmh). |
Air Handling Unit | AHU | An air handler, or air handling unit is a device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. |
Building Automation System | BAS | A computer-based control system installed in buildings System that controls and monitors the building’s mechanical and electrical equipment such as ventilation, lighting, power systems, fire systems and security systems. |
Building Control System | BCS | A computer-based control system installed in buildings System that controls and monitors the building’s mechanical and electrical equipment such as ventilation, lighting, power systems, fire systems and security systems. |
Building Management System | BMS | A computer-based control system installed in buildings System that controls and monitors the building’s mechanical and electrical equipment such as ventilation, lighting, power systems, fire systems and security systems. |
Bypass | | A pipe used to convey fluid to or around another pipe. |
Cooling Coil | CC | |
Central Processing Unit | CPU | The part of a computer that inteprets and executes instructions. |
Cooling Water | CW | Energy contained in cold water used to supplement energy recovery. |
Dehumidification | | The process to remove atmospheric moisture. |
Dry Bulb Temperature | DB | The temperature of air measured by a thermometer freely exposed to the air but shielded from radiation of moisture. |
Dew Point | DP | The atmospheric temperature (varying according to pressure and humidity) below which water droplets begin to condense and dew can from. |
Exhaust Air | EA | Commonly known as return air. The air mechanically removed from a building. |
Electrical Cabinet | ECA | |
Energy Recovery Coil | ERC | Energy Recovery Heat Exchanger |
Exhaust Heat Recovery Coil | EHRC | |
Energy Recovery System | ERS | A system to reclaim and recycle waste heat from other sources, such as building exhaust air, in order to reduce the need for the primary energy source. |
Filter | | A device to remove contaminants. |
Free-Cooling | FC | An economical method of using low external air temperatures to assist in chilling water that can be used in mechanical processes. |
Hydronic Module | | Prefabricated unit containing mechanical equipment, controls, valves and sensors. |
Heat Recovery Coil | HRC | |
Heat Recovery System | HRS | A system to reclaim and recycle waste heat from other sources, such as building exhaust air, in order to reduce the need for the primary energy source. |
Humidity relative | % r.H. | The ratio of the partial pressure of water vapor in an air-water mixture to the saturated vapor pressure of water at a prescribed temperature. |
Heating, Ventilation, Air Conditioning | HVAC | |
Heating Water | HW | |
Latent Heat | | The quantity of heat absorbed or released by a substance undergoing a change of state. |
Light-Emitting Diode | LED | A device that lights up and displays information when electricity passes through it. |
Outside Air | OA | Air taken from the external atmosphere not previously circulated through the building. |
Pre-Heat Coil | PHC | Preheat elements are the first element in the air stream following the intake and prefilter, which is a position that allows them to protect the rest of the system and building from freezing air. |
Plate & Frame Heat Exchanger | PHx | A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. |
Plate & Frame Heat Exchanger Cooling Water | PHE-CW | |
Plate & Frame Heat Exchanger Heating Water | PHE-HW | |
Return Air | RA | Describes the air leaving a room. It may be recyled or purged to the environment. |
Return Air Humidifier | RA-HUM | |
Running Around Recovery System | RARS | A very efficient type of energy recovery system that consists of heat exchangers in the supply and exhaust air streams, piping (containing a heat transfer fluid) between the heat exchangers and a pump. Sophisticated systems communicate with the BMS and include controls and monitoring equipment. |
Re-Heat Coil | RHC | |
Sensible Heat | | Heat exchanged by a body or thermodynamic system that has as its sole effect a change of temperature. |
Supply Air | SA | Air that has been conditioned entering a space. |
Supply Air Humidifier | SA-HUM | |
Supply Heat Recovery Coil | SHRC | |
Supply Heat Recovery Coil - Pre Heater | SHRC-PH | |
Supply Heat Recovery Coil - Supplenmentary Heater | SHRC-SH | |
Uninterruptable Power Supply | UPS | A device that supplies power on a short term basis when a primary power source is lost. |
Ventilation | | The process of "changing" or replacing air in a space to provide high indoor air quality. |
Variable Frequency Drive | VFD | Power control conversion devise for 3 phase motors. |
Virtual Private Network | VPN | A network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or individual users with secure access to their organization’s network. |
Wet Bulb Temperature | WB | The temperature at which water, by evaporating into air, can bring the air to saturation at the same temperature. |
Watchdog Timer | WDT | An electronic timer that is used to detect and recover from computer malfunctions. |