The Building Automation System (BAS) of Center of Sustainable Landscapes (CSL) is built by Automated Logic Corporation. Following control logic diagrams are from BAS website. 

 
 source: http://ba.conservatory.org/ (2016)

source: http://ba.conservatory.org/ (2016)

Energy recovery wheel

The operational condition of energy recovery wheel depends on:

  • Whether the economizer mode is allowed 
  • Outdoor air temperature below a certain value 

 

 

Geothermal water loop (pre-cooling coil)

The geothermal water loop is allowed when:

  • The water temperature is smaller than mixed air temperature
  • The outdoor temperature is below a certain level

 

  SOURCE:   HTTP://BA.CONSERVATORY.ORG/ (2016)

SOURCE: HTTP://BA.CONSERVATORY.ORG/ (2016)

  SOURCE:   HTTP://BA.CONSERVATORY.ORG/ (2016)

SOURCE: HTTP://BA.CONSERVATORY.ORG/ (2016)

  SOURCE:   HTTP://BA.CONSERVATORY.ORG/ (2016)

SOURCE: HTTP://BA.CONSERVATORY.ORG/ (2016)

Geothermal water loop (Re-heating coil)

The geothermal water loop is allowed when:

  • The pre-cooling mode is on
  • The mixed air temperature is below supply air set-point

 

 

 

Water source heat pump

  SOURCE:   HTTP://BA.CONSERVATORY.ORG/ (2016)

SOURCE: HTTP://BA.CONSERVATORY.ORG/ (2016)

The reversed water source heat pump can be used in heating or cooling mode.                    

The cooling mode is enabled when:

  •    there is no need for heating
  •     pre-cooling coil is operating
  •     cooling request (which is derived from indoor conditions) is above a certain value

The heating mode is enabled when:

  •     there is a need for heating
  •     the heating request is above a certain value