High-pressure re-start control algorithm for microchannel condenser with reheat coil

    公开(公告)号:US11022331B2

    公开(公告)日:2021-06-01

    申请号:US15362316

    申请日:2016-11-28

    Abstract: An HVAC system with a reheat coil is described, the system includes a compressor, a micro-channel condenser and an evaporator. A reversing valve is connected to the compressor, the micro-channel condenser and the reheat coil. The reversing valve is used to direct the refrigerant from the compressor to the micro-channel condenser in a normal mode, and to direct the refrigerant from the compressor to the reheat coil in a reheat mode. The reversing valve can be switched from normal mode to reheat mode when a high pressure condition is detected at an input to the micro-channel condenser, and switched back from reheat mode to normal mode when the high pressure condition has resolved or an amount of time has passed. In the normal mode the refrigerant is returned from the reheat coil into a refrigerant line between the evaporator and the compressor through a restrictor.

    System and method for controlling a blower of an energy recovery ventilator in response to internal air pressure

    公开(公告)号:US10823447B2

    公开(公告)日:2020-11-03

    申请号:US15465229

    申请日:2017-03-21

    Abstract: An energy recovery ventilator includes first and second blowers, a pressure transducer and a controller. The first blower is configured to direct a first air stream into a first zone of an enclosure. A second blower configured to direct a second air stream into a second zone of the enclosure. A pressure transducer is configured to determine internal air pressure within the enclosure. A controller is configured to control the first blower and/or the second blower in response to the internal air pressure.A method includes fabricating a rooftop unit and an ERV housing, the rooftop unit comprising an economizer, the ERV housing comprising first and second blowers and a pressure transducer. The method further includes coupling the ERV housing to the economizer and coupling a controller to the pressure transducer, the controller configured to control the first and/or second blowers in response to the internal air pressure.

    METHOD AND SYSTEM FOR SUPPLY-AIR RE-CIRCULATION

    公开(公告)号:US20200173683A1

    公开(公告)日:2020-06-04

    申请号:US16208880

    申请日:2018-12-04

    Abstract: An HVAC system includes an evaporator coil disposed between a supply air duct and a return air duct. A re-circulation duct fluidly couples the supply air duct and the return air duct. A damper is disposed in the re-circulation duct and is moveable between an open position and a closed position. A controller is operatively coupled to a variable-speed compressor, a variable-speed circulation fan, and the damper. Responsive to a determination that the variable-speed circulation fan is operating at the minimum speed and the suction pressure is above the pre-determined threshold, the controller signals the damper to move to the open position. Responsive to a determination that the variable-speed circulation fan is not operating at the minimum speed or the suction pressure is below the pre-determined threshold, the controller signals the damper to move to the closed position.

    HVAC bypass control
    28.
    发明授权

    公开(公告)号:US10563883B2

    公开(公告)日:2020-02-18

    申请号:US15879140

    申请日:2018-01-24

    Abstract: A heating, ventilation, and air conditioning (HVAC) system is configured to receive a signal from a thermostat. The signal instructs the HVAC system to operate a component in a partial load mode. The HVAC system is further configured to determine that the component has exceeded its operating envelope. In response to determining that the component has exceeded its operating envelope, the HVAC system is configured to operate the component according to an override configuration. The override configuration overrides the signal to operate the component in the partial load mode.

    Method of defrosting an energy recovery ventilator unit

    公开(公告)号:US10386087B2

    公开(公告)日:2019-08-20

    申请号:US15708530

    申请日:2017-09-19

    Abstract: A method of defrosting an energy recovery ventilator unit. The method comprises defrosting an energy recovery ventilator unit. The method comprises activating a defrost process of an enthalpy-exchange zone of the energy recovery ventilator unit when an air-flow blockage in the enthalpy-exchange zone coincides with a frost threshold in the ambient environment surrounding the energy recovery ventilator unit. The method also comprises terminating the defrost process when a heat transfer efficiency across the enthalpy-exchange zone returns to within 10 percent of a pre-frosting heat transfer efficiency wherein, the heat transfer efficiency is proportional to a temperature difference between an intake air zone of the energy recovery ventilator and a supply air zone of the energy recovery ventilator divided by a temperature difference between an return air zone of the energy recovery ventilator and the intake air zone.

    Layout for an energy recovery ventilator system

    公开(公告)号:US10254003B2

    公开(公告)日:2019-04-09

    申请号:US15187073

    申请日:2016-06-20

    Abstract: A method of manufacturing an energy recovery ventilator unit includes providing a cabinet having exterior walls and interior floors and walls that define an intake zone, a supply zone, a return zone, an exhaust zone and an enthalpy-exchange zone. The intake zone and the exhaust zone are both on one side of the enthalpy exchange zone. The supply zone and the return zone are both on an opposite side of the enthalpy exchange zone. The method further includes installing a first blower in the intake zone. The first blower pushes outside air into the intake zone and straight through the enthalpy exchange zone into the supply zone. The method also includes installing a second blower in the return zone. The second blower pushes return air into the return zone and straight through the enthalpy exchange zone into the exhaust zone.

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