Refrigerant Flow Control Systems in HVAC

Control method and device for heat exchanger systems that optimizes refrigerant flow through the system by dynamically regulating compressor operation and refrigerant reserve levels based on temperature differences. The method monitors temperature differences between indoor and outdoor environments and adjusts compressor operation frequency and refrigerant reserve levels accordingly. This enables optimal refrigerant flow when temperatures are within predetermined ranges, while preventing excessive refrigerant flow when temperatures are outside these ranges.

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Operating an HVAC system with enhanced thermal management capabilities through a flow control device that dynamically regulates the primary fluid flow rate based on the secondary fluid temperature. The device monitors both primary and secondary fluid temperatures and adjusts the primary fluid flow rate to maintain optimal temperature differential between the primary and secondary fluid streams. This enables precise control over the thermal energy transfer process, ensuring reliable operation and energy efficiency while maintaining safe operating conditions.

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Air conditioner with a built-in liquid reservoir that enables dynamic refrigerant management through a single control system. The air conditioner includes an outdoor unit with a compressor, first and second heat exchangers, and a liquid reservoir connected to the refrigerant circuit. The liquid reservoir stores refrigerant during normal operation, while the compressor and heat exchangers operate as usual. When the air conditioner enters an operating mode, the liquid reservoir can be used to supplement the compressor's refrigerant supply, while the compressor's normal operation is maintained. This allows the air conditioner to operate with a variable refrigerant capacity, enabling precise control over the amount of refrigerant used during different operating conditions.

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Air conditioning system with autonomous refrigerant circulation adjustment to improve performance. The system has a liquid storage tank connected to the refrigerant piping between the outdoor heat exchanger and indoor heat exchangers. Valves control refrigerant exchange between the tank and system. The valve states are adjusted based on parameters like compressor and heat exchanger superheats to optimize refrigerant flow. This allows dynamic refrigerant circulation adjustment based on load to prevent over/under flow issues.

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A method for optimizing air conditioner operation through dynamic control of refrigerant branch valves. The method enables precise temperature control during heat transfer by dynamically regulating the refrigerant branch valves based on condensation temperature. This approach eliminates the need for standard refrigerant fill rates and allows continuous monitoring of the refrigerant system. The control method is implemented through a storage medium containing the control program, which can be executed by a processor to implement the dynamic valve control strategy.

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Air conditioner that determines refrigerant quantity based on ambient temperature and system operation mode. The system calculates the refrigerant amount difference between actual and optimal operating conditions, enabling precise refrigerant quantity determination regardless of system configuration. This approach eliminates the need for manual refrigerant charging and provides accurate refrigerant quantity monitoring across various operating modes.

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A refrigerant circulation device, air conditioner, and control method that enables precise temperature control through a novel refrigerant path configuration. The device employs a switching component that divides the refrigerant flow into two paths: one for the evaporator and another for the condenser. This path configuration allows the refrigerant to be pre-cooled before entering the condenser, while also enabling the condenser to operate at lower temperatures. The device achieves temperature control through the precise control of refrigerant flow between the evaporator and condenser, enabling dynamic temperature adjustments while maintaining optimal system performance.

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Heat pump air conditioner with adaptive refrigerant management through a novel valve plate mechanism. The valve plate enables controlled opening and closing of a conductive hole in the cylinder, allowing precise regulation of the refrigerant path during both heating and cooling cycles. This valve plate system enables the heat pump to optimize refrigerant usage and maintain system pressure during heating, while also storing excess refrigerant during cooling to prevent pressure surges.

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Flow control system for HVAC systems that enables precise control of fluid flow between two circuits through a single valve. The system employs a 3-way valve with a 2-way return port, a flow sensor, and a controller. The valve switches between circuit connections based on circuit selection, while the flow sensor measures flow through the valve's output port. The controller controls the valve position based on setpoint values, flow rate, and temperature differential. The system achieves precise flow control by maintaining the valve position when flow is below maximum limits, and dynamically adjusting position when flow exceeds maximum limits.

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Control method and device for air conditioners that improves refrigerant distribution and heat transfer efficiency through a novel expansion valve strategy. The method involves dynamically adjusting the expansion valve opening to optimize refrigerant flow distribution between evaporator branches. By increasing the expansion valve opening when the branch temperature difference between inlet and outlet exceeds a predetermined threshold, the method enhances the evaporator's heat transfer capacity while preventing excessive refrigerant flow into the shunt. This approach ensures more uniform refrigerant distribution between evaporator branches and maintains optimal subcooling conditions in the condenser.

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A method for controlling heating and cooling in HVAC systems to achieve both targeted cooling and heating temperatures. The method involves selecting an operating mode based on cooling and heating demands, and then operating the system in that mode. The modes include adaptive cooling, adaptive heating, and balanced cooling/heating. The adaptive modes unload the compressor when the temperature exceeds a threshold. The balanced modes control the flow of fluids to meet target temperatures.

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A control method and air conditioner for an air conditioner refrigeration system that improves heat dissipation efficiency of the electric control board while maintaining temperature regulation performance. The method enables controlled heat dissipation of the electric control board through a novel branch control valve configuration that directs refrigerant flow through a uniform temperature plate on the high-temperature board area. This configuration enables precise temperature regulation while maintaining system efficiency, particularly in high-temperature operation conditions.

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Air conditioner that can achieve further performance improvement of a refrigeration cycle using an internal heat exchanger while keeping the size of the internal heat exchanger small. The air conditioner includes a refrigerant circuit, an internal heat exchanger, an external heat exchanger, and a flow rate adjusting device.

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HVAC system that enables precise temperature and humidity control through dynamic refrigerant flow management. The system employs a modulating valve that directs refrigerant to two distinct heat exchangers: a condenser coil and a reheat coil. The valve's control circuit monitors air flow conditions and dynamically apportions refrigerant between these heat exchangers based on the air flow's operating parameters. This enables precise temperature and humidity management of the supply air flow, allowing for more accurate space conditioning compared to traditional vapor compression systems.

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An air conditioner with a compact internal heat exchanger that enhances refrigeration performance through optimized heat transfer. The system employs a novel heat exchanger design where the heat transfer medium is maintained between the refrigerant circuits. A flow rate adjustment device controls the heat medium flow rate to the heat exchanger, while a temperature sensor monitors the heat medium temperature. This enables precise control of heat transfer while maintaining the compact size of the internal heat exchanger.

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A two-pipe heat recovery multi-line system that enables dynamic control of refrigerant flow direction based on cooling and heating demand. The system integrates an outdoor unit refrigeration system, a mode converter, and multiple indoor units, with a flow control device that determines operating mode based on demand analysis. The device controls the flow direction of refrigerant through strategically positioned solenoid valves, enabling automatic mode switching between cooling and heating modes. This enables enhanced user experience by automatically adapting operating modes to changing demand conditions.

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A three-tube heat recovery multi-split air conditioning system that dynamically adjusts cooling indoor unit evaporator temperature in response to ambient conditions. The system integrates a low temperature cooling and anti-freezing module with a refrigerant distribution device, featuring a heat exchange assembly with four-way valves. When the indoor unit's evaporator temperature falls below a predetermined threshold, the system automatically adjusts the evaporator temperature by generating intermediate pressure between the low temperature cooling module and the low-pressure air tube. This adaptive control ensures optimal evaporator temperature matching to ambient conditions while preventing freezing.

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Control method for a multi-line system that optimizes refrigerant flow through an air treatment device by dynamically adjusting the throttle element's opening based on the device's actual heat transfer requirements. The method measures the device's superheat or subcooling levels in both cooling and heating modes, and uses this information to control the throttle element's opening. This enables precise control of refrigerant flow rates while maintaining optimal heat transfer performance.

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Air conditioner control method that prevents indoor unit freezing during low-temperature operation. The method maintains the indoor unit evaporator temperature at a predetermined value while controlling the refrigerant distribution device's valve opening. When the system enters low-temperature mode, the evaporator temperature is set based on the indoor unit evaporator temperature and the distribution device's outlet temperature. The control method ensures the refrigerant distribution device maintains a safe operating temperature, preventing the indoor unit from freezing during low-temperature operation.

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Air conditioner with optimized refrigerant circulation and heat transfer by introducing a novel piping configuration. The system employs a parallel piping arrangement between the heat source and utilization units, with separate return paths that enable controlled refrigerant flow management. This configuration enables the system to dynamically regulate refrigerant flow between the heat source and utilization units, allowing efficient heat transfer and improved system performance across both heating and cooling modes.

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