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Coordinated control of HVAC system using aggregated system demand

  • US 9,851,727 B2
  • Filed: 05/28/2015
  • Issued: 12/26/2017
  • Est. Priority Date: 05/28/2015
  • Status: Active Grant
First Claim
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1. An HVAC system comprising:

  • a plurality of HVAC components;

    a plurality of terminal units, at least one terminal unit of the plurality of terminal units associated with each HVAC component of the plurality of HVAC components;

    a control system comprising;

    a coordination module; and

    a controller operably associated with the coordination module and in signal communication with the plurality of HVAC components and associated terminal units, the controller configured to;

    determine an aggregated thermal demand of the HVAC system;

    determine, with the coordination module, an operational setpoint for at least one HVAC component of the plurality of HVAC components based on the determined aggregated thermal demand; and

    send a signal indicative of each determined operational setpoint to each associated HVAC component of the plurality of HVAC components;

    wherein the plurality of HVAC components comprises a capacity generation plant, a fluid circulation pump, and ventilation equipment;

    wherein the coordination module includes a cooling mode module and a heating mode module;

    wherein determining the operational setpoint for at least one of the plurality of HVAC components comprises at least one of;

    (i) determining one or more setpoints to be sent to the capacity generation plant, wherein the controller is configured to set the capacity generation plant to a minimum effort setpoint below a low demand threshold (La), increase the effort setpoint from the low demand threshold (La) to a high demand threshold (Ha) and to set a maximum effort setpoint beyond the high demand threshold (Ha);

    (ii) determining one or more setpoints to be sent to the fluid circulation pump, wherein the controller is configured to set the pump to a minimum effort setpoint below a low demand threshold (Lb), increase the effort setpoint from the low demand threshold (Lb) to a high demand threshold (Hb) and to set a maximum effort setpoint beyond the high demand threshold (Hb);

    (iii) determining one or more setpoints to be sent to the ventilation equipment that treats fresh air from outside, wherein when the capacity generation plant is operated in cooling mode, a supply air setpoint (SATsp) is determined by the sum of the maximum room air temperature setpoint amongst all zones and the air duct losses/gains, and wherein when the capacity generation plant is operated in heating mode, a supply air setpoint (SATsp) is determined by the sum of the minimum room air temperature setpoint amongst all zones and the air duct losses/gains.

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