Answered stationary engineer definitions

Cl2 CORRECT ANSWER Chlorine boiler CORRECT ANSWER equipment that provides hot water or steam for various uses PRV CORRECT ANSWER PRESSURE RELIEVE VALVE NOWL CORRECT ANSWER Normal operating water level BTU CORRECT ANSWER British Thermal Unit absolute pressure CORRECT ANSWER gauge pressure (psi) + atmospheric pressure (14.7 psi) at sea level air changes per hour CORRECT ANSWER The hourly ventilation rate divided by the volume of a space. For perfectly mixed air or laminar flow spaces, this is equal to the number of times per hour that the volume the space is exchanged by mechanical and natural ventilation. Air conditioner CORRECT ANSWER An appliance, system, or mechanism designed to dehumidify and extract heat from an area. Chiller CORRECT ANSWER A device that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. This cooled liquid flows through pipes in a building and passes through coils in air handlers, fan-coil units, or other systems, cooling and usually dehumidifying the air in the building. Chillers are of two types; air-cooled or water-cooled. Air-cooled chillers are usually outside and consist of condenser coils cooled by fan-driven air. Water-cooled chillers are usually inside a building, and heat from these chillers is carried by recirculating water to a heat sink such as an outdoor cooling tower.