公开(公告)号：US20210325071A1

公开(公告)日：2021-10-21

申请号：US17361190

申请日：2021-06-28

Applicant: Hefei Midea Heating & Ventilating Equipment Co., Ltd. ,  GD Midea Heating & Ventilating Equipment Co., Ltd.

Inventor： Guozhong YANG ,  Xin LIANG ,  Mingren WANG ,  Zhijun TAN

IPC: F24F11/64 ,  F24F11/80 ,  F24F11/70 ,  F24F11/84 ,  G05B19/042

Abstract: A control method and device for a low-temperature cooling air valve include: obtaining an actual system pressure, an ambient temperature, and a system energy requirement; and determining an opening degree pre according to the actual system pressure, the ambient temperature, and the system energy requirement. The control method is employed to perform combined control on the low-temperature cooling air valve according to the system high pressure, the ambient temperature and the system energy requirement, and can refine the range of opening degrees of the low-temperature cooling air valve and determine an opening degree thereof, thereby facilitating cooling operation of a multi-split air conditioning system in an ultra-low temperature environment, while also increasing the reliability of the cooling operation at low temperature and expanding the operation range.

公开(公告)号：US11149976B2

公开(公告)日：2021-10-19

申请号：US16447813

申请日：2019-06-20

Applicant: Johnson Controls Technology Company

Inventor： Rachel A. Glanzer ,  Brennan H. Fentzlaff ,  Kirk H. Drees

IPC: F24F11/84 ,  F24F140/20

Abstract: A method for controlling flow in a heating, ventilation, and air conditioning (HVAC) system includes adjusting a setpoint associated with a valve based on a temperature change across a heating or cooling coil to reduce energy waste. The method includes receiving a first temperature measurement associated with an inlet of the coil, receiving a second temperature measurement associated with an outlet of the coil, calculating a difference between the first temperature measurement and the second temperature measurement, determining that the difference between the first temperature measurement and the second temperature measurement is below a threshold, and adjusting a setpoint associated with the valve. Additional control features may be provided to improve system behavior such as a pulse generation feature, a change-limiting feature, and a reevaluation feature.

公开(公告)号：US11098936B2

公开(公告)日：2021-08-24

申请号：US16355351

申请日：2019-03-15

Applicant: GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD. ,  MIDEA GROUP CO., LTD.

Inventor： Changjing Tang

IPC: F25B47/02 ,  F24F11/42 ,  F24F11/64 ,  F24F11/84 ,  F24F11/85 ,  F24F3/06 ,  F24F140/12

Abstract: A multi-split air conditioning system and liquid return prevention control method thereof. When the multi-split air conditioning system is in heating operation, the multi-split air conditioning system is switched to a defrosting mode to operate for defrosting if an outdoor unit receives a defrosting instruction. After detecting gas exhaust pressure, gas return pressure and gas exhaust temperature of a compressor in real time, the multi-split air conditioning system sends a defrosting completion signal to a diverter, controls the compressor to reduce frequency and a plurality of electric-control valves to open, and controls any one of the electric-control valves to open and the rest of the electric-control valves to close during reversing of a four-way valve, so as to reduce the amount of a refrigerant returned to a low-pressure gas-liquid separator.

公开(公告)号：US11092981B2

公开(公告)日：2021-08-17

申请号：US16031310

申请日：2018-07-10

Applicant: Siemens Schweiz AG

Inventor： Karl-Heinz Petry

IPC: F24F11/84 ,  F25B41/20 ,  G05B13/02 ,  G05B23/02 ,  G05D7/00 ,  G05D7/06 ,  F16K31/04 ,  F24D19/10 ,  F25B40/00 ,  H03M3/00 ,  F16K1/22 ,  H03M1/12

Abstract: A valve assembly may include: a valve body with a fluid path extending between the inlet port and the outlet port; a valve member with a closed position blocking the fluid path and an open position; a sensor the fluid flow; an actuator coupled to the valve member; and a controller for the actuator with a set point value and a default flow rate indicative of nominal flow through the fluid path. The controller may: read the sensor; calculate a flow rate; compare the flow rate to a threshold value indicative of substantially zero flow rate; and if the measure of flow rate is below the threshold value, calculate a position of the valve member directly from the set point value and the default flow rate, produce a control signal from the calculated position, and communicate the control signal to the actuator.

公开(公告)号：US11047590B2

公开(公告)日：2021-06-29

申请号：US16338246

申请日：2017-09-26

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Takuro Yamada ,  Yuusuke Nakagawa ,  Masahiro Honda ,  Yuusuke Oka

IPC: F24F11/84 ,  F25B1/10 ,  F25B5/02 ,  F25B31/00 ,  F25B41/20 ,  F25B41/40 ,  F25B43/00 ,  F25B13/00

Abstract: An air conditioner, in which a liquid-pressure adjustment expansion valve that decompresses a refrigerant so that the refrigerant flowing through a liquid-refrigerant connection pipe is in a gas-liquid two-phase state is provided in an outdoor liquid-refrigerant pipe that connects a liquid-side end of an outdoor heat exchanger to the liquid-refrigerant connection pipe, properly transports the refrigerant in a two-phase state while suppressing an increase in a discharge temperature of a compressor. A liquid injection pipe that branches part of a refrigerant flowing through an outdoor liquid-refrigerant pipe and feeds the branched refrigerant to a compressor is connected to a portion of the outdoor liquid-refrigerant pipe on a side of an outdoor heat exchanger with respect to a liquid-pressure adjustment expansion valve.

公开(公告)号：US20210164684A1

公开(公告)日：2021-06-03

申请号：US17262891

申请日：2018-09-28

Applicant: Mitsubishi Electric Corporation

Inventor： Naofumi TAKENAKA ,  Kimitaka KADOWAKI ,  Hiroki WASHIYAMA ,  Yuji MOTOMURA ,  Koji FURUYA ,  Jun NISHIO ,  Koji AZUMA

IPC: F24F11/84 ,  F24F11/52

Abstract: An air-conditioning apparatus includes: a heat-medium transfer device including a pump provided to transfer a heat medium that contains water or brine and transfers heat; a plurality of indoor units each of which includes an indoor heat exchanger provided to cause heat exchange to be performed between indoor air and the heat medium, and a flow control valve provided to adjust a flow rate of the heat medium that flows through the indoor heat exchanger, the plurality of indoor units being connected to the heat-medium transfer device by respective heat medium pipes; and a controller provided to control an opening degree of the flow control valve. The controller determines a valve opening-degree control range that is a control range of an opening degree of the flow control valve of each indoor unit, based on a flow-passage resistance depending on a length of a pipe that extends from the heat-medium transfer device to the indoor unit, such that the lower the flow-passage resistance, the smaller the valve opening-degree control range.

公开(公告)号：US20210102726A1

公开(公告)日：2021-04-08

申请号：US16595671

申请日：2019-10-08

Applicant: Mitsubishi Electric US, Inc.

Inventor： Joseph Paul BUSH ,  Allen BARBELY

IPC: F24F11/84 ,  F25B30/02 ,  F24F3/00

Abstract: A low ambient cooling system for a variable refrigerant flow heat pump includes an outdoor air conditioning unit and an indoor air conditioning unit. The outdoor air conditioning unit includes an outdoor heat exchanger with one or more valves that selectively control refrigerant flow through different sections of condenser coils during a low ambient cooling mode. During the low ambient cooling mode, the condenser coils of the outdoor heat exchanger include an active coil section through which refrigerant flows and an inactive coil section that is closed. An outdoor-coil restrictor plate with holes is attached to the active condenser coil in the outdoor air conditioning unit. The outdoor-coil restrictor plate restricts excessive heat release from the active coil section of the condenser coils in the outdoor heat exchanger during the low ambient cooling mode.

公开(公告)号：US10969128B2

公开(公告)日：2021-04-06

申请号：US15503568

申请日：2015-08-13

Applicant: VIGILENT CORPORATION

Inventor： Clifford Federspiel ,  Prasad Nair

IPC: F24F11/00 ,  G06Q50/06 ,  G05B13/02 ,  F24F11/30 ,  F25B49/02 ,  G05B15/02 ,  F24F11/62 ,  F24F11/83 ,  F25B25/00 ,  F24F11/63 ,  F24F11/84 ,  F24F11/64 ,  F24F11/46

Abstract: The present invention is directed to an apparatus for minimizing power consumption in a cooling system. In one embodiment, the apparatus comprises one or more processors, one or more sensors associated with one or more regulated environments and one or more chillers that regulate temperature of the one or more regulated environments and a storage device, coupled to the one or more processors, storing instructions that when executed by the one or more processors performs a method. The method comprises gathering readings from the one or more sensors, determining a cost and power consumption associated with setting values for a plurality of control variables associated with the one or more chiller plants, selecting values for the control variables with a minimum cost as optimized control variable values and applying the optimized control variable values to the plurality of control variables to minimize power consumption of the cooling system.

公开(公告)号：US20210080137A1

公开(公告)日：2021-03-18

申请号：US17046291

申请日：2018-08-28

Applicant: GREE ELECTRIC APPLIANCES (WUHAN) CO., LTD ,  GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI

Inventor： Shiqiang ZHANG ,  Lianfa WU ,  Limin LI ,  Huachao JIAO ,  Bing ZHOU ,  Peng CAO ,  Tao FENG

IPC: F24F11/30 ,  F24F1/0068 ,  F24F1/32 ,  F24F1/48 ,  F24F11/86 ,  F24F11/84 ,  F25B13/00 ,  F25B29/00 ,  F25B49/02

Abstract: An air conditioning system, including a compressor, two outdoor heat exchange units, a liquid pipe used for communicating with indoor units, a high-pressure gas tube and a low-pressure gas tube; the air conditioning system further includes a valve assembly. One outdoor heat exchange unit has a first state in which one end thereof communicates with the high-pressure gas tube and another end thereof communicates with the liquid pipe, and has a second state in which one end thereof communicates with the low-pressure gas tube and the other end thereof communicates with the liquid pipe. Further disclosed is a control method for the air conditioning system.

公开(公告)号：US20210063044A1

公开(公告)日：2021-03-04

申请号：US16961786

申请日：2019-08-09

Applicant: Qingdao Haier Air-conditioning Electronic Co., Ltd ,  Haier Smart Home Co., Ltd.

Inventor： Kun YANG ,  Yunhua MA ,  Longling GE ,  Yanyao LEI ,  Chao SUN ,  Changyou XIONG ,  Zhiyang GAO ,  Yabin SUI ,  Zhigao CAO ,  Shouyu LIU

IPC: F24F11/84 ,  F24F11/64

Abstract: A method of judging lack-of-freon in an air conditioner and an air conditioner control method. The control method includes: acquiring outflow air temperatures at the first air outlet and the second air outlet, and calculating a temperature difference; comparing the temperature difference with a preset temperature difference threshold; and adjusting an opening degree of the expansion valve accordingly. In the method, the opening degree of the expansion valve can be automatically adjusted according to a result of temperature comparison to compensate for the flow rate of freon, so as to improve the cooling or heating efficiency of the air conditioning system and realize the adaptive adjustment of the air conditioner, thereby ensuring the cooling or heating efficiency of the system even if the system lacks freon to a slight extent and effectively reducing energy consumption. The judging method has a higher accuracy of judging result, and is easier to implement.