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    HEAT PUMP SYSTEMS AND METHODS WITH FROST MITIGATION
    74.
    发明公开
    HEAT PUMP SYSTEMS AND METHODS WITH FROST MITIGATION 审中-公开

    公开(公告)号：US20230375212A1

    公开(公告)日：2023-11-23

    申请号：US18199139

    申请日：2023-05-18

    Applicant: Johnson Controls Tyco IP Holdings LLP

    Inventor： Jeremy Ryan Smith ,  Thomas John Martin

    IPC: F24F11/84 ,  F24F11/41 ,  F24F11/65 ,  F24F11/86

    CPC classification number: F24F11/84 ,  F24F11/41 ,  F24F11/65 ,  F24F11/86 ,  F24F2140/30

    Abstract: A heat pump includes a working fluid circuit configured to circulate a working fluid therethrough. The working fluid circuit includes a first heat exchanger, a second heat exchanger, a compressor, and an expansion valve. The first heat exchanger is configured to exchange heat between the working fluid and a supply air flow, and the second heat exchanger is configured to exchange heat between the working fluid and an ambient air flow. The heat pump also includes a bypass circuit configured to direct a portion of the working fluid from the compressor to the second heat exchanger, a bypass valve configured to control a flow of the portion of the working fluid along the bypass circuit, and a controller configured to receive data indicative of a measured value of an operating parameter associated with formation of frost on the second heat exchanger and to control a position of the bypass valve based on a comparison of the measured value with a baseline value of the operating parameter.

    REFRIGERATION CYCLE APPARATUS
    75.
    发明公开
    REFRIGERATION CYCLE APPARATUS 审中-公开

    公开(公告)号：US20230366583A1

    公开(公告)日：2023-11-16

    申请号：US18227588

    申请日：2023-07-28

    Applicant: DAIKIN INDUSTRIES, LTD.

    Inventor： Ken TAKAHASHI

    IPC: F24F11/86 ,  F24F11/61 ,  F24F11/84 ,  F24F11/871

    CPC classification number: F24F11/86 ,  F24F11/61 ,  F24F11/84 ,  F24F11/871

    Abstract: A refrigeration cycle apparatus suppresses a phenomenon that a condensed refrigerant accumulates in a heat source-side heat exchanger during a low-load operation. A refrigeration cycle apparatus performs air conditioning of a target space. The refrigeration cycle apparatus includes a refrigerant circuit and a controller. The refrigerant circuit includes a compressor, a heat source-side heat exchanger, an expansion mechanism, a usage-side heat exchanger, and a flow direction switching mechanism. The controller controls the compressor and the flow direction switching mechanism. The controller executes first control of temporarily increasing the pressure of the refrigerant flowing through the heat source-side heat exchanger in a low-load operation in which the refrigerant circuit is in a low-load state with a low air conditioning load and the compressor operates at a predetermined number of rotations or less.

    HVAC SYSTEM LEAK DETECTION
    78.
    发明公开
    HVAC SYSTEM LEAK DETECTION 审中-公开

    公开(公告)号：US20230160587A1

    公开(公告)日：2023-05-25

    申请号：US18153237

    申请日：2023-01-11

    Applicant: Lennox Industries Inc.

    Inventor： Payam Delgoshaei ,  Eric Berg

    IPC: F24F11/36 ,  F24F11/84 ,  F24F11/86

    CPC classification number: F24F11/36 ,  F24F11/84 ,  F24F11/86 ,  F24F2140/12

    Abstract: An HVAC system includes a high-pressure subsystem and a low-pressure subsystem. After determining that refrigerant leak diagnostics should be performed, a controllable valve is closed between a condenser and compressor of the HVAC system. The compressor then operates until a predetermined input refrigerant pressure is reached. After the predetermined input refrigerant pressure is reached, operation of the compressor is stopped. After stopping operation of the compressor and waiting at least a predetermined wait time, the pressure in the low-pressure subsystem of the HVAC system is monitored. A rate of change of the pressure in the low-pressure subsystem is determined. If the rate of change is negative and a magnitude of the rate of change is greater than a threshold value, a leak location is determined to be in the low-pressure subsystem.

    System and method for identifying causes of HVAC system faults
    79.
    发明授权
    System and method for identifying causes of HVAC system faults 有权

    公开(公告)号：US11639803B2

    公开(公告)日：2023-05-02

    申请号：US17651942

    申请日：2022-02-22

    Applicant: Lennox Industries Inc.

    Inventor： Amita Brahme ,  Umesh Gokhale

    IPC: F24F11/38 ,  F24F11/86 ,  F24F110/40 ,  F24F110/10

    Abstract: A controller of an HVAC system is communicatively coupled to a suction-side sensor and a shutoff switch. The controller stores measurements of the suction-side property over an initial period of time. The controller detects that the shutoff switch is tripped at a first time stamp corresponding to an end of the initial period of time. The controller accesses the measurements of the suction-side property. The controller determines, based on the measurements of the suction-side property, whether the suction-side property has an increasing or decreasing trend. In response to determining that the suction-side property has the increasing trend, the controller determines that a malfunction of a fan caused the shutoff switch to trip. In response to determining that the suction-side property has the decreasing trend, the controller determines that a blockage of the refrigerant conduit subsystem caused the shutoff switch to trip.

    OUTDOOR UNIT OF AIR-CONDITIONING APPARATUS
    80.
    发明申请
    OUTDOOR UNIT OF AIR-CONDITIONING APPARATUS 有权

    公开(公告)号：US20230100590A1

    公开(公告)日：2023-03-30

    申请号：US17794666

    申请日：2020-03-19

    Applicant: Mitsubishi Electric Corporation

    Inventor： Tomohiro MORI ,  Motoshi NASU ,  Akinori HASHIMOTO

    IPC: F24F11/32 ,  F24F1/20 ,  F24F11/52 ,  F24F11/86

    Abstract: An outdoor unit of an air-conditioning apparatus includes: a refrigerant circuit in which a compressor and an outdoor-side heat exchanger are connected by a refrigerant pipe; an outdoor-side fan that sends air to the outdoor-side heat exchanger; and a controller including an inverter circuit configured to drive the compressor. The controller includes: a first heat generating component; a second heat generating component that generates a smaller amount of heat than the first heat generating component; a temperature detection circuit provided in the first heat generating component to detect a temperature thereof; a temperature acquisition module that acquires the temperature detected by the temperature detection circuit; and an estimate calculation module that calculates a temperature estimate of the second heat generating component based on the temperature acquired by the temperature acquisition module, and calculates an estimate of a life of the second heat generating component based on the temperature estimate.

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