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Two phase loop distributed HVACandR system

  • US 10,429,102 B2
  • Filed: 01/05/2017
  • Issued: 10/01/2019
  • Est. Priority Date: 01/05/2016
  • Status: Active Grant
First Claim
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1. An HVAC&

  • R system comprising;

    a first pumping device configured to circulate a first medium, the first medium includes a first two-phase fluid;

    a plurality of secondary HVAC&

    R units, wherein at least one of the plurality of secondary HVAC&

    R units is operably coupled to the first pumping device, wherein at least one of the plurality of secondary HVAC&

    R units is configured to operate in a heating mode and a cooling mode;

    a primary HVAC&

    R unit operably coupled to at least one of the plurality of secondary HVAC&

    R units and the first pumping device;

    a controller; and

    at least one sensing device;

    wherein the first pumping device, a portion of each of the plurality of secondary HVAC&

    R units, and a portion of the primary HVAC&

    R unit form a primary fluid loopwherein the at least one sensing device is disposed on at least the first primary loop, wherein the at least one sensing device is configured to monitor the pressure and temperature of at least the first medium in the first primary loop, wherein the controller is configured to prevent cavitation in the first pumping device by varying the operation of at least the first primary HVAC&

    R unit and the first pumping device to maintain the subcooling of the first medium at an inlet of the first pumping device using the monitored pressure and temperature;

    wherein each of the plurality of secondary HVAC&

    R units includes a secondary compressor and a first secondary heat exchanger operably coupled to the secondary compressor, wherein the secondary compressor is configured to circulate a second medium, the second medium includes a second two-phase fluid;

    wherein a portion of the primary fluid loop is operably coupled to the first secondary heat exchanger.

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