![]() The indoor environmental standard is 10 ppm (0.001%) or less, and the environmental standard for air pollution is 10 ppm or less per hour as a daily average, or 20 ppm or less per hour as an 8-hour average. Even a small amount of this gas is harmful to the human body. Carbon monoxide is generated when fuel lacks oxygen during combustion. C Carbon MonoxideĪn odorless and colorless gas. Butterfly ValveĪ valve in which a disk-shaped valve element rotates and opens and closes in a cylindrical valve enclosure, operated from a drive shaft along the diameter of the valve element. BrineĪlso referred to as a secondary refrigerant, brine is a liquid used in indirect cooling systems that circulates through the evaporator of a refrigerator and to a place to be cooled, transferring heat to the evaporator. The pressure capacity can be 1 to 20 mH₂O, and it is used for pumping air, gas, etc., in factories and the like. BlowerĪ type of centrifugal fan that compresses air and other gases. The structure is the same as that of an industrial cleanroom, but the main purpose is to control dust-borne bacteria, and so the room is devised so that it can be sterilized. Bioclean RoomĪ cleanroom for microoganisms. The bell mouth is the intake port of an axial blower. The point where the speed of the gas or liquid is increased by rapidly squeezing the fluid is called a bell mouth. Special background noise is noise that enters from the outside, internally generated noise other than air conditioning equipment, and the like. When examining the noise of air conditioning equipment in facilities such as halls and studios, it refers noise when the air conditioning equipment is stopped and in the absence of people. When a specific sound is considered as a target in a certain place, noise at the place when there is no target sound is referred to as background noise with respect to the target sound. The contacts are closed (closed circuit) when the relay is energized. A-type ContactĪ term representing the contact structure of a relay or similar device, and refers to a structure in which the contacts are normally open (open circuit) when the relay is not operating (when it is not energized). Mainly it specifies the ratio of the long side to the short side of a duct outlet, intake grille frame, or rectangular duct frame. In case of natural ventilation, the Building Standards Law stipulates that they be installed at a height of less than half the ceiling height. Air Supply Opening (Outlet)Īn opening in a wall or other surface to take in air. Since each device can be combined according to the required conditions of the blown air, it is also used for air conditioning that requires strict temperature and humidity control. ![]() Air Handling UnitĪ relatively large-capacity air conditioner that integrates a hot and cold water coil, humidifier, drain pan, blower, and air filter. In addition, it prevent foreign bodies such as mosquitoes, flies and insects from entering warehouses. It is used to prevent internally cooled and heated air from leaking out in buildings with many people, and is installed at the entrance of packing material storage and raw material warehouses in food factories and pharmaceutical factories, etc. Air CurtainĪn air curtain is equipment installed at openings such as entrances and entrances of buildings to form a thick layer of airflow in order to block the ingress of outside air, foreign matter, and dust. Allows airflow that is blown into a room to induce and mix with the existing room air. Anemostat DiffuserĪ ceiling-mounted outlet with several cone-shaped blades inside. ![]() The freezing point of water in terms of absolute temperature is 273 K (Kelvin). ![]() Atmospheric pressure in terms of absolute pressure would be 1.03 kg/cm 2.Absolute Pressure = Gauge Pressure + Atmospheric Pressure (1.03 kg/cm 2) Absolute TemperatureĪbsolute temperature is a temperature in which absolute zero is when the motion of the material particles stops (as considered in the thermodynamical sense), and a is scale applied that is the equivalent to the Celsius scale. Units are interms of kg/cm 2 abs or kg/cm 2 absolute. The pressure measured referenced to the pressure of an complete vacuum as 0. The ratio of the mass of water vapor contained in a volume of air to the total mass of that volume of air.
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