18 results about "Variable refrigerant flow" patented technology

The invention discloses a gas environment regulation and control system and method for a clean laboratory. The gas environment regulation and control system comprises an air treatment unit and a gas monitoring unit, and the air treatment unit and the gas monitoring unit are connected with an intelligent control unit; the control unit is connected with an execution mechanism; the air treatment unit comprises a three-stage filtering module, an activated carbon adsorption module, a variable refrigerant flow air conditioning system and a heat recovery device; the gas monitoring unit comprises a multi-dimensional sensor network, a movable sampling device and a rail type gas suction hood; the intelligent control unit comprises an edge computing node and a cloud management platform; the execution mechanism comprises an airflow control assembly and a temperature and humidity regulation and control assembly. The gas environment regulation and control system of the clean laboratory adopts a composite purification technology and has a real-time monitoring and purifying function.

The present application relates to a power failure detection circuit, the circuit comprises: a rectifying circuit for full-wave rectifying an alternating current voltage so as to obtain a first voltage; a switching circuit for converting the first voltage into a periodic voltage pulse; and a judgment circuit for providing an output signal to a fan control circuit for closing a fan when the periodic voltage pulse is not received within a preset time period, and providing the output signal to a micro-control unit for closing an electronic expansion valve. The present application also relates to a control circuit for a variable refrigerant flow VRF system.

The present disclosure describes various embodiments of a new HVAC system and apparatuses (and related methods) that combine the efficiencies of VRF and VAV systems. An exemplary system comprises a plurality of indoor units located in different zones of a building, each comprising a damper operable to modulate airflow through the indoor unit into a building space and a valve operable to modulate a flow of refrigerant through the indoor unit; an air handling unit having a supply fan that is configured to generate the airflow that is received by the plurality of indoor units; and a controller unit operable to control the damper and the valve simultaneously for each of the plurality of indoor units, wherein the controller unit is operable to control the supply fan and an amount of airflow generated by the supply fan.

Multiple air handling units feeding into a common air distribution system are used to provide both latent and sensible temperature control. When dehumidification without sensible cooling is required, different air handling units feeding into a common distribution system may be operated in different modes so that both cooling and reheating are occurring simultaneously. The result is an energy efficient means of controlling both ambient air temperature and relative humidity. Air handling units such as water source heat pumps and variable refrigerant flow (VRF) units may be employed.

The embodiment of the invention discloses clothes treatment equipment with a drying function, a control device and a filter screen cleaning method, and belongs to the technical field of clothes treatment equipment. The clothes treating equipment comprises a clothes treating drum. The air duct assembly comprises a main air duct for communicating the first air outlet of the clothes processing drum with the air inlet and an auxiliary air duct for communicating the second air outlet of the clothes processing drum with the air inlet, the main fan is arranged in the main air duct, and the auxiliary fan is arranged in the auxiliary air duct; the heat pump system comprises a first refrigerant circulating flow path and a second refrigerant circulating flow path which are variable in refrigerant flowing direction. The first filter screen covers the first air outlet, and the second filter screen covers the second air outlet; the control device is configured to control the heat pump system to be in a starting state in the filter screen cleaning process, control the rotating direction of the main draught fan and the rotating direction of the auxiliary draught fan according to the filth blockage conditions of the first filter screen and the second filter screen, and control the refrigerant flowing direction of the first refrigerant circulating flow path and the refrigerant flowing direction of the second refrigerant circulating flow path. According to the invention, the filter screen can be timely and effectively cleaned.

The invention discloses a household modular energy station, which has the one-to-many integration advantage of a regional energy station, and adopts a variable refrigerant flow method to perform flow distribution of a terminal by controlling the refrigerant circulation amount of a compressor and the refrigerant flow entering an indoor heat exchanger. And in response to the call of energy conservation and emission reduction, a total heat recovery measure is taken on the condenser side, so that the aim of environmental protection is fulfilled. Heat exchangers of products such as a refrigerator, a heat pump water heater, an air conditioner, an oven and a clothes dryer form various modular energy terminals, and other system hosts are combined into a set of large system to be placed outdoors for operation so as to reduce cost and improve efficiency. A user can purchase corresponding energy terminals for rapid combination according to family needs. And after calculation configuration is carried out on the modular energy station, overall decoration arrangement is carried out. According to the invention, multiple purposes are achieved through centralized energy supply and modular terminals.

The present application discloses a variable refrigerant flow air conditioning system, comprising: an outdoor unit, comprising a compressor and an outdoor expansion element; a plurality of indoor units connected to the outdoor unit by means of refrigerant piping, and each indoor unit comprising an indoor expansion element; and a control apparatus configured for controlling the outdoor unit and the plurality of indoor units. When heating, after receiving a shutdown or stop command, the control apparatus executes an evacuation operation, so that refrigerant on the outdoor unit side moves toward the indoor unit side. The control apparatus may be configured to perform control so as to achieve an equilibrium state between pressure at a suction side and pressure at a discharge side of the compressor.

Disclosed in the embodiments of the present application are a state processing method and apparatus for a variable refrigerant flow system, a storage medium and an electronic device. The method comprises: acquiring target system configuration information and target device operation information of a target variable refrigerant flow system; on the basis of the target system configuration information, performing system diagram matching processing on the target variable refrigerant flow system to obtain a target system schematic diagram component; and, on the basis of the target device operation information, performing system operating state configuration on the target system schematic diagram component to obtain a target system operating state topological graph. The technical solution is used to combine obtained target system configuration information and target device operation information of target variable refrigerant flow systems, thereby configuring target system operating state topological graphs.

An HVAC system includes a first indoor heat exchanger coupled to an outdoor heat exchanger and disposed in a first zone. A second indoor heat exchanger is coupled to the outdoor heat exchanger and disposed in a second zone. A compressor is coupled to the outdoor heat exchanger, the first indoor heat exchanger, and the second indoor heat exchanger. A first circulation fan is positioned to circulate air around the first indoor heat exchanger and a second circulation fan is positioned to circulate air around the second indoor heat exchanger. A zone controller is coupled to the first indoor heat exchanger and configured to measure a temperature in the first zone, compare the measured temperature to a setpoint temperature of the first zone, and responsive to a difference between the measured temperature and the setpoint temperature, adjust a speed of the first circulation fan independent the second circulation fan.

Multiple air handling units feeding into a common air distribution system are used to provide both latent and sensible temperature control. When dehumidification without sensible cooling is required, different air handling units feeding into a common distribution system may be operated in different modes so that both cooling and reheating are occurring simultaneously. The result is an energy efficient means of controlling both ambient air temperature and relative humidity. Air handling units such as water source heat pumps and variable refrigerant flow (VRF) units may be employed.

The present application discloses a variable refrigerant flow air conditioning system, comprising: an outdoor unit, comprising a compressor and an outdoor expansion element; a plurality of indoor units connected to the outdoor unit by means of refrigerant piping, and each indoor unit comprising an indoor expansion element; and a control apparatus configured for controlling the outdoor unit and the plurality of indoor units. When heating, after receiving a shutdown or stop command, the control apparatus executes an evacuation operation, so that refrigerant on the outdoor unit side moves toward the indoor unit side. The control apparatus may be configured to perform control so as to achieve an equilibrium state between pressure at a suction side and pressure at a discharge side of the compressor.

An oil return control method and apparatus for variable refrigerant flow (VRF), and a VRF system. The oil return control method for VRF comprises: when a VRF system needs to enter an oil return operation, dividing, according to an operating state of each I indoor unit, indoor units into a first indoor unit and a second indoor unit, wherein the oil return operation comprises a plurality of oil C return stages; and using different control strategies at each oil return stage, so as to control the frequency of a compressor of the VRF Lq system and control the opening degree of an indoor unit valve of at least one of the first indoor unit and the second indoor unit.

Disclosed are a method for controlling a variable refrigerant flow (VRF) air conditioner, a VRF air conditioner, and a computer-readable storage medium. The method includes: obtaining a target indoor unit in a warming stage among started indoor units; determining a target superheat degree according to a working condition parameter of the target indoor unit; and adjusting an operating parameter of an electronic expansion valve of the target indoor unit according to the target superheat degree.

A Variable Refrigerant Flow (VRF) dehumidification system. The system has at least one condenser module in fluid communication with one or more indoor air handlers. At least one evaporator coil is in fluid communication with the indoor air handlers and at least one reheat / reclaim coil. The evaporator and reheat / reclaim coils are also in communication with the condenser module. A plurality of electronic expansion valves (EEVs) are in fluid communication with the indoor air handlers. A plurality of sensors is disposed in the system and are in communication with at least one VRF dehumidification system controller. In one embodiment, a logic is stored in a non-transitory computer readable medium that, when executed by one or more processors, causes the VRF dehumidification system to monitor the data input from the plurality of sensors and regulates the capacity of the VRF dehumidification system needed to maintain a set dew point parameter.

A variable refrigerant flow (VRF) air conditioning system, a control method thereof, and a computer-readable storage medium are provided. When the VRF air conditioning system is cooling, indoor units in an operating state are obtained. Indoor units with humidity demand and indoor units without humidity demand in the operating state are obtained. A ratio of humidity demand is determined according to an output nominal value of each indoor unit in the operating state. The ratio can include a ratio of a total output nominal value of indoor units with humidity demand to a total output nominal value of indoor units without humidity demand. When the ratio is greater than a preset ratio, a rotation speed of an outdoor fan can be adjusted according to an outdoor environment temperature.

A refrigerant charge controller for heating, ventilation, or air conditioning (HVAC) equipment includes a processing circuit configured to analyze usage data for the HVAC equipment using a machine learning model to estimate an amount of refrigerant used by the HVAC equipment, identify a refrigerant deficiency based on the amount of refrigerant, and initiate a corrective action in response to identifying the refrigerant deficiency.

A method for air conditioning including installing an air conditioning unit at a desired location. The air conditioning unit includes a housing that has air supply inlets and exhaust air outlets. The housing encloses a mode control unit that switches a zone coil associated with a zone from a cooling mode to a heating mode by switching from a cooling medium to a heating medium flowing through the zone coil. The zone coil receives the heating or cooling medium and conditions incoming air from a supply fan to be exhausted in a zone associated with the zone coil. A variable refrigerant flow cooling / heating unit provides a cooling medium or a heating medium at varying rates to control a temperature of a zone.