Economizer mode

The economizer mode is used to provide free cooling when outdoor condition is desirable. In summer or transit season, when the outdoor air enthalpy is smaller than indoor air enthalpy, the economizer is turned on. In economizer mode, the recirculating damper is closed and the system is operating in 100% outdoor air mode.

   
  
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   Economizer psYchrometric Chart (credited by yjy (2016))

Economizer psYchrometric Chart (credited by yjy (2016))

Air flow diagram : Economizer mode

  SOURCE : CREDITED BY YJY (2016)

SOURCE : CREDITED BY YJY (2016)

Heating Mode

The heating is provided by geothermal water loop, water source heat pump and the heat exchange via desiccant energy recovery wheel. The control and operational mode of these components is determined by heating request, outdoor air condition, return air condition, geothermal water temperature. 

Air flow diagram : Heating mode

  SOURCE : CREDITED BY YJY (2016)

SOURCE : CREDITED BY YJY (2016)

Cooling Mode

The cooling is provided by geothermal water loop, water source heat pump and the heat exchange via desiccant energy recovery wheel. The control and operational mode of these components is determined by cooling request, outdoor air condition, return air condition, geothermal water temperature. 

Air flow diagram : Cooling mode

  SOURCE : CREDITED BY YJY (2016)

SOURCE : CREDITED BY YJY (2016)