Mapa mental

HVAC

Zoe Wong Inglês

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HVAC

AHU
- Damper
  - adjust air volume flow rate by altering air passage cross-section with opposing blades rotating on horizontal pins.
  - opening control by servo motor handled by automatic control syustem.
  - Parallel blades
    - deflection and shut-off purpose
  - Opposing blades
    - controlled synchronously
- Mixed Air Chamber
  - 2-way
    - outdoor ventilation mix with return air
    - minimize energy consumption
  - 3-way
    - incorporates separate return air fan
    - use opposing blades damper
  - free cooling
    - when outdoor isat or slightly below indoor design T
    - activated by having outdoor air damper on open position to supply up to 100% outdoor air without operating air-conditioning equipment
- Air Filter
  - Mechanical
    - Bag Type
      - MERV: 13-16
    - Box Type
      - high efficiency particulate air (HEPA)
        MERV: 17-20
      - ultra low penetration air (ULPA)
        MERV: 17-20
    - Pleated Type
      - MERV: ~6
  - Elastrostatic
    - >95% on Arrestance (not efficient) scale
    - washable
    - MERV: 4
  - Minimum Efficiency Reporting Value (MERV)
- Air Conditioning Source
  - Heating
    - furnace
    - boiler
  - Cooling
    - DX Coil
    - Water Coil
- Humidifier
- Supply Air Fan
  - fan position
    - Draw-through
      - generate better uniform air flow across cooling/heating source
      - carry over condensation from cooling source due to air dehumidification
    - Blow-through
  - fan type
    - centrifugual
      - pulled along fan shaft and blown radially away from shaft in scroll casing
      - forward curved (FC)
      - backward curved (BC)
        Airfoil fan
        centrifugal fan with BC blades thickened twice
        highest efficiency
    - axial
      - pulled along fan shaft and blown along in same direction
      - propeller
      - tubeaxial
      - vaneaxial
- Air Distribution
  - Air conveyance
    - fittings
    - ducts
      - metal duct (rigid)
        least heat loss/gain
        least fan operating cost
      - non-metal duct (flexible) - fibreglass
        insulation
        light weight
        low cost
        sound absorbing
        rectangular: fibreglass board
        round: fiberglass aluminum foil
      - noise reduction
        vibration
        canvas (flexible) connection @ inlet & outlet opentings
        residual
        inner duct surface with acoustical board
      - return air
        return-air plenum space for small area
        vast space in drop ceiling
        low air velocity for noise reduction
  - Room distribution
    - ceiling distribution
      - ceiling/linear diffuser
        include volume control damper
        excellent for cooling & heating
        without undue draft or local discomfort
      - cooling only
    - inside wall distribution
      - register
        grille with volume control damper
    - perimeter distribution
      - along exposed perimeter of space
      - optimum comfort for winter heating
    - grille
      - fixed/adjustable blades directing flow only
    - air outlet performance
      - noise
        noise criteria (NC)
        increase NC, decrease size of outlet
      - outlet/face velocity
        500 to 800 fpm
      - throw
        distance b/w outlet and occupied zone
      - drop
        vertical distance supply air has fallen at the end of throw
      - terminal velocity
        50fpm at the end of throw

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Descrição: Mapa Mental sobre HVAC, criado por Zoe Wong em 12-12-2016.
Criado por: Zoe Wong
Visualizações: 8
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HVAC

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