What does AHU stand for? What does AHU mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: AHU. We've found a total of 6 definitions for AHU: Filter by:Select category from list...──────────AllAcademic & Science (1)Architecture (1)Unions (1)FDA (1)NASA (1)Unclassified (3)Airport Codes (1) AHUAir Handling UnitAcademic & Science » Architecture -- and more...AHUAl Hoceima, MoroccoRegional » Airport CodesAHUArquivo Histórico UltramarinoMiscellaneous » UnclassifiedAHUAir Handling UnitsMiscellaneous » UnclassifiedAHUAir HandlingMiscellaneous » UnclassifiedAHUArizona Hockey UnionCommunity » Unions What does AHU mean? Know what is AHU? Got another good explanation for AHU? Don't keep it to yourself! Still can't find the acronym definition you were looking for? Use our Power Search technology to look for more unique definitions from across the web! . STANDS4 LLC, 2016.

The list of abbreviations used in a set of engineering drawings varies from office to office.  Be sure to check the front section of the drawing set for the abbreviations used within. AAir or Compressed Air CFMCubic Feet per Minute CTBDCooling Tower Blow Down EAEach or Exhaust Air EAHUExhaust Air Handling Unit FAFree Area or Fire Alarm FDFloor Drain, Fire Damper, or Fire Department HPHorsepower or High Point HZHertz (Cycles per Second) NCNoise Criteria or Normally Closed PCFPounds per Cubic Foot PSIPounds per Square Inch PSIAPounds per Square Inch - Absolute PSIDPounds per Square Inch - Differential PSIGPounds per Square Inch - Gauge SDSmoke Detector or Smoke Damper SFDCombination Smoke / Fire Damper TEFCTotally Enclosed Fan Cooled TON12,000 BTUH (Cooling Capacity)Sample Plans and Sections partitions to divide the underfloor plenum into separate zones (e.g., interior and perimeter) is comparable to the conventional approach to zoning with

overhead air distribution systems. It enables supply air of different temperatures or volumes to be delivered to different spaces within the overallDiffusers within the same zone typically receive supply air of similar In addition to being either partitioned or open-plan, plenums can operate asPressurized plenums have a small positive static pressure applied, created by a central fan in the air-handling unit (AHU), that drives the air up through the diffusers to the lower pressure surroundings of the conditioned office space. Standard methods of control at the central AHU are used to maintain the desired overall supply volume and temperature under thermostatic control, and a pre-set pressure level, at which the diffusersThe low operational pressure of underfloor plenums, compared to ceiling-based systems, potentially reduces fan energy consumption and thus operating costs. In zero-pressure plenums, small local fan units draw air from the underfloor

plenum and deliver it to the space through floor diffusers or outlets located in the furniture or partitions. Compared to passive diffusers, used with pressurized-plenum systems, fan-powered outlets are generally more easily and effectively controlled by nearby occupants. home air conditioner compressor not working onHowever, for reasons of reducedoutdoor ac unit fan motor maintenance, installation and equipment costs, pressurized-plenums are the mostreset button on ac unit outside commonly installed systems at present. Air is typically extracted from the room through return grilles located at ceiling level using a conventional ceiling-return plenum. If no plenum is present, air can be returned through high side-wall grilles.

The return air is then ducted back to the AHU where it is either exhausted to the outdoors, or filtered and dehumidified as necessary in the AHU before mixing with the supply air and re-entering the underfloor plenum. In some configurations, a portion of the return air is re-circulated directly back into the underfloor plenum where it is thoroughly mixed with incoming primary air from the AHU. Some portion of each floor in a typical building will be devoted to accommodating the mechanical plant risers, equipment (e.g. the AHU) and circulation shafts such as stairs and elevators. In the plans indicated this area is placed as centralized at the core of the floor plate, however this is not always the case. Other possibilities include a distributed or perimeter service area, for example. Shown below, in plan view and corresponding floor-to-floor section, are threeThe first two examples represent earlier UFAD designs in which the more extensive use of ductwork and partitions

within the plenum was a more common practice.  It is now recommended to minimize to the extent possible, the amount of installed ducts, air highways, and other HVAC-related components in the underfloor plenum so that it can serve as a highly flexible and accessible service plenum.  For any particular building project, the most suitable configuration will be determined by a number of parameters unique to that project - such as floor plate area, site-specific climate, or anticipated HVAC loads and their distribution, for example. this reason it is important that decisions as to the plenum configuration be made with respect to the project's characteristics. In addition, please note that the drawings shown below represent only three of any number of possible 1. Multi-zoned with extensive perimeter ductwork This approach has been used in many existing underfloor installations and uses a similar control strategy to overhead variable-air-volume (VAV) systems.

Conditioned air is supplied to interior and perimeter zones through an underfloor supply duct encircling the interior/perimeter boundary. to defining the interior and perimeter, underfloor sheet metal partitioning is used to create smaller zones around the perimeter of the floor plan, as well as other zones as necessary. Using a conventional variable-air-volume (VAV) control strategy, air flow to each zone is controlled by VAV terminal units in response to zone thermostats. Supply air is delivered to all zones through passive (swirl or other non fan-powered) diffusers. Nearby occupants have some amount of control over these floor diffusers. In this example, heating in the perimeter zones is accomplished with reheat coils (electric or water-based) inThe large amount of perimeter ductwork may restrict the flexibility to reconfigure plenum services in the future. 2. Multi-zoned, limited perimeter ductwork This approach also uses underfloor partitioning to divide interior and

However, the amount of underfloor ductwork is reduced by relying on a single feeder duct to supply conditioned air to each of the four large perimeter zones, as shown. are used to deliver a constant volume, variable temperature supply of air toAir flow from individual diffusers in the interior zone may be controlled by nearby occupants. Air flow to the perimeter zones is delivered through linear grills and controlled by VAV terminal units in response to zone thermostats. Perimeter finned tube heating coils, located directly under the linear grills in the underfloor plenum, are used during the heating mode. Conditioned air from a central source is distributed to diffusers across the entire floor area through a single, undivided pressurized plenum. methods of control at the central AHU are used to maintain the static pressure in the plenum at a constant level. Supply air is delivered to the interior zone through passive diffusers that can be controlled by nearby occupants.