HVAC SYSTEM Flashcards
A system or process for simultancously controlling the temperature, humidity, purity, distribution, and motion of the air in an interior space, esp. one capable for cooling.
AIR CONDITIONING
A refrigeration process ni which cooling is effected by the vaporization and expansion of a liquid refrigerant.
COMPRESSIVE REFRIGERATION
The component of a refrigeration system in which the refrigerant absorbs heat from a cooling medium and changes from aliquid to a gas.
EVAPORATOR
a device that uses a compressible refrigerant to transfer heat from one reservoir to another, with the process being reversible so that it can be used for both heating and cooling a building.
HEAT PUMP
A refrigeration process that uses a generator and an absorber instead of a compressor to transfer heat.
ABSORPTION REFRIGERATION
A device for transferring the heat of a fluid flowing on one side of a barrier to a fluid flowing on the other.
HEAT EXCHANGER
Any device or apparatus for controlling, esp. lowering, the temperature and humidity of a space.
AIR CONDITIONER
A factory-assembled air conditioner having a fan, filters, compressor, condenser, and evaporator coils for cooling. For heating, the unit may operate as a heat pump or contain auxiliary heating elements.
PACKAGED AIR CONDITIONER
A valve that reduces the pressure and evaporation temperature of a refrigerant as it flows to the evaporator
EXPANSION VALVE
A liquid capable of vaporizing at a low
temperature, such as ammonia, used in mechanical refrigeration.
REFRIGERANT
A pump or other machine for reducing the voulme and increasing the pressure of a gas.
COMPRESSOR
A device for reducing a vapor or gas to liquid or solid form.
CONDENSER
The demand placed on a heating, ventilating, or air-conditioning system in order to maintain the desired conditions of thermal comfort in a building.
LOAD
The hourly rate of heat gain in an enclosed space expressed in Btu per hour and used as the basis for selecting an air-conditioning unit or system
COOLING LOAD
A degree-day above the standard temperature of 75°F (24°C), used in estimating energy requirements for air-conditioning and refrigeration.
COOLING DEGREE-DAY
A fluid substance, such as chilled water or cool air, for removing heat, as from the interior spaces of a building.
COOLING MEDIUM
The cooling effect obtained when 1ton of ice at 32°F (0°C) melts to water at the same
temperature in 24 hours, equivalent to 12,000 Btu/hr. (3.5 kW
TON OF REFRIGERATION
An index of the efficiency of a refrigerating unit: expressing the Btu removed per watt of electrical energy input.
ENERGY EFFICIENCY RATING
A fluid agent for reducing the temperature of a system below a specified value by conducting away the heat produced in the operation of the system.
COOLANT
A medium or environment for the absorption or dissipation of unwanted heat.
HEAT SINK
The component of an absorption-refrigeration system that uses a saline solution to draw water vapor from the evaporator, cooling the remaining water in the process.
ABSORBER
The component of an absorption-refrigeration system that uses a heat source to remove excess water vapor from a saline solution.
GENERATOR
