The intentional introduction of outside air can be categorized as either mechanical ventilation, or natural ventilation. Ventilation is mainly used to control indoor air quality by diluting and displacing indoor pollutants it can also be used for purposes of thermal comfort or dehumidification when the introduction of outside air will help to achieve desired indoor psychrometric conditions. "Ventilation is the intentional introduction of outside air into a space.
This apartment HVAC (Heating, Ventilating and Air Conditioning) plan shows the layout of exhaust ventilation duct outlet diffusers.
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The HVAC plan example "Digital unit ventilator control" was created using the ConceptDraw DIAGRAM diagramming and vector drawing software extended with the HVAC Plans solution from the Building Plans area of ConceptDraw Solution Park. A thermostat may switch on and off at temperatures either side of the setpoint the extent of the difference is known as hysteresis and prevents too frequent switching of the controlled equipment." The output of the sensor then controls the heating or cooling apparatus. Thermostats can be constructed in many ways and may use a variety of sensors to measure the temperature. The name is derived from the Greek words thermos "hot" and statos "a standing".Ī thermostat may be a control unit for a heating or cooling system or a component part of a heater or air conditioner. The thermostat does this by switching heating or cooling devices on or off, or regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature.
"A thermostat is a component of a control system which senses the temperature of a system so that the system's temperature is maintained near a desired setpoint.
This HVAC floor plan sample illustrates the temperature sensors of air handler digital thermostat control. The floor plan example "Air handler - HVAC plan" was created using the ConceptDraw DIAGRAM diagramming and vector drawing software extended with the HVAC Plans solution from the Building Plans area of ConceptDraw Solution Park. An air handler designed for outdoor use, typically on roofs, is known as a packaged unit (PU) or rooftop unit (RTU)." A larger air handler that conditions 100% outside air, and no recirculated air, is known as a makeup air unit (MAU). Small air handlers, for local use, are called terminal units, and may only include an air filter, coil, and blower these simple terminal units are called blower coils or fan coil units. Sometimes AHUs discharge (supply) and admit (return) air directly to and from the space served without ductwork. Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the AHU. An air handler is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. "An air handler, or air handling unit (often abbreviated to AHU), is a device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. This HVAC plan sample shows the air handler layout on the floor plan.
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