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Ventilation (HVAC systems (Air conditioning systems (Thermal storage…

- - - - Heating and cooling supplied by AHU
        
        Single duct system
        
        CAV
        
        VAV
        
        VAV system terminal device controls the air volume dictated by thermostat
        
        Reduction of air flow increases duct pressure. Static pressure sensor controls fan power
        
        Low operation cost
        
        Dual Duct system
        
        CAV
        
        Fan is always running
        
        Relatively easy to design and install
        
        Low installation cost
        
        VAV
        
        Multi zone system
        
        CAV
        
        VAV
  - - - When there is excess energy or cheaper
    - - Air source
      - Water source
        
        Using sufface water
        
        wells
      - Ground source
        
        Soil temperature at 10-15m varies very lite though out the year
        
        Ground could be used as a heat sink
        
        Vertical
        
        Expensive
        
        Little land use 15-20m beween borhole
        
        High efficient
        
        Diamiter 110-170mm
        
        Depth 100-300m
        
        Heat exchange rate 10-30w/m
        
        Horizontal
        
        More land required
        
        Less expensive
        
        Less efficient
      - Exhaust air
        
        Electric heating for cold weather
        
        Ventiletion
        
        Hot water
        
        Heating
        
        2-4 COP:
    - - Packed Units
        
        Usually outside
        
        25-250kW
        
        Condenser
        
        Compressor
        
        Cooling coil
        
        Hasting coil
        
        Fan
      - Split unit
        
        Reversible flow Cools and heats
        
        5-90 kW
      - Window/Wall mounted
        
        1.5-7 kW
        
        Used in residential buildings
    - - Commercial and industrial applications
      - Water is used for heating and cooling
      - Minimized ducts
      - 150kW +
  - - - Larger then compressor systems
      - Les noise level and vibration
      - COP: 0.5-1.4
      - Low maintainance
    - - Economical with cheep electricity
      - Smaller compared to absorption
      - CPO reduces considerably at part loads
      - CPO: 3-5
      - Noisy