Techniques to Make Heat Exchangers Leak Resistant

A heat exchange assembly for HVAC equipment that eliminates the need for multiple refrigerant sensors while maintaining safety. The assembly comprises a mounting frame with a side panel that houses the heat exchange tubes, with each tube having a protruding bending area on the panel surface. A sealing cover is integrated into the panel to enclose the tube's bending area, creating a sealed environment for refrigerant flow between the heat exchange tubes and compressor assembly. This design eliminates the need for separate refrigerant sensors while maintaining the critical safety feature of preventing refrigerant leaks during installation.

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A low-emission safety combined heat and cooling heat recovery system for HVAC applications. The system employs a condensing evaporator operating at low pressure to produce hot water, thereby reducing refrigerant leakage risks and enhancing system reliability. The system integrates a condenser and evaporator in a single unit, with the evaporator operating at low pressure to produce hot water. This design minimizes the risk of refrigerant leakage while maintaining the system's safety features.

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Control method and system for heat exchangers that minimizes liquid spillage while maintaining heat transfer efficiency. The method compares the pressure difference across the heat exchanger's inlet and outlet to determine optimal fan speed. When a liquid baffle is present, the system dynamically adjusts fan speed to maintain the pressure difference while maintaining airflow. This approach reduces fan speed increases to avoid energy waste and maintains optimal heat transfer performance.

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Heat exchanger design that prevents fluid leakage through internal passages by utilizing a novel sealing mechanism. The design incorporates a cylindrical outer casing with a side wall featuring a reinforced sealing mechanism. The sealing mechanism comprises an elastomeric insert that compresses and deforms between the side wall and the heat exchanger, effectively blocking fluid leakage through the internal passages. This design provides a reliable barrier against fluid leakage while maintaining heat transfer efficiency, particularly advantageous for applications requiring precise fluid flow control.

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Air conditioning system that prevents refrigerant leaks in the indoor heat exchanger while maintaining safety. The system features a refrigerant detection device integrated into the indoor heat exchanger, which continuously monitors refrigerant flow through the heat exchanger. When a leak is detected, the system automatically activates a refrigerant recovery device that captures and recovers the leaking refrigerant. This proactive recovery capability prevents refrigerant accumulation in the room while maintaining system safety.

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Air conditioning system with enhanced water management through advanced monitoring and control. The system employs a water sensor group to detect water leaks in the refrigerant circuit, and an emergency valve to rapidly shut off the refrigerant flow when water is detected. The system integrates pressure monitoring to accurately assess the water immersion situation, enabling comprehensive judgment of system integrity. This proactive approach prevents water-borne system damage, including compressor failure and system downtime, while maintaining reliable operation.

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Air conditioner with rapid leak detection capability that eliminates safety hazards and improves environmental performance. The system employs a novel leak detection mechanism integrated into the air conditioner's heat exchanger, utilizing a combination of acoustic sensors and intelligent control algorithms to rapidly identify refrigerant leaks. This enables proactive intervention to prevent potential safety risks, while maintaining high efficiency and energy savings.

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Air conditioning system with enhanced safety features for refrigerant leaks. The system comprises a compressor unit and a valve unit, with each housing a refrigerant circuit. The valve unit features a liquid control valve and a gas control valve, with a dedicated detection system for refrigerant leaks. The system incorporates a dedicated detection unit that monitors refrigerant concentrations in the system, triggering a ventilation response when a leak is detected. The detection unit is integrated into the valve unit casing, with the valve unit housing the refrigerant circuits and the detection unit housing the detection system. The system includes a dedicated ventilation control structure that switches between normal and ventilation modes when a leak is detected, with the ventilation control structure being connected to the valve unit casing.

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Reducing the amount of refrigerant leakage by closing an opening/closing device when it is determined that refrigerant is present, and storing refrigerant condensed in a condenser in a refrigerant tank. The suppression is achieved by storing refrigerant condensed in a condenser, and an opening/closing device that controls passage of refrigerant flowing out of the refrigerant tank.

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Air conditioning system with enhanced refrigerant leak detection and ventilation control. The system employs a dual-ventilation approach where the air-conditioned space is connected directly to the outside environment through a heat exchanger, while the refrigerant supply air path bypasses the heat exchanger. A refrigerant sensor monitors refrigerant leaks, triggering the ventilation control mechanism to automatically open the bypass path when detected. This approach enables continuous refrigerant recovery while maintaining a direct connection to the outside environment.

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Vehicle air conditioner that suppresses the outflow of the refrigerant leaked from the refrigeration cycle into the vehicle interior. The air conditioner includes a housing, an indoor heat exchanger, an indoor blower, a detector, a suction port damper, and a ventilation port damper.

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A method for detecting refrigerant leaks in HVAC systems that employs a vertical baffle to direct refrigerant flow. The method involves circulating refrigerant between the indoor and outdoor heat exchangers through a pump, with a baffle positioned vertically adjacent to either the indoor or outdoor heat exchanger. The baffle directs at least a portion of refrigerant flow downward toward a refrigerant detection assembly, enabling rapid leak detection and separation of ignition sources.

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Preventing leakage in plate heat exchangers through controlled operation modes. The method involves monitoring the temperature difference between the sealing gasket and the ambient environment, and adjusting the system's operating parameters accordingly. The system maintains a specific operating state when the temperature difference is positive, reduces compressor frequency when the temperature difference is negative, and maintains the current operating state when the temperature difference is zero. This approach prevents refrigerant leakage by controlling the system's response to temperature changes, thereby maintaining system integrity.

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A water source cooling and heating dual-purpose air conditioner integrated machine with a novel waterproof design that prevents water leaks during installation. The machine features a fixed bottom shell with an external drain pipe through a sealing sleeve, a leak-proof box mounted on the bottom shell's outer wall, and an integrated water-absorbing system. The leak-proof box is positioned on the external wall of the bottom shell, with an installation groove providing a secure mounting point. This design eliminates the need for traditional plumb lines and level measurements during installation, making the system more accessible and efficient.

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A split air conditioning system that achieves low-temperature, low-noise, and low-vibration operation through a novel design of connecting pipes. The system features a unique rubber hose connection between the indoor and outdoor heat exchangers, eliminating metal-to-metal connections that can cause resonance and vibration issues. This design enables the system to maintain optimal performance while significantly reducing refrigerant leakage, noise levels, and vibration characteristics compared to conventional split systems.

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Air conditioner with adaptive refrigerant leakage detection that matches the specific characteristics of each indoor space. The system employs a control unit that dynamically adjusts the maximum allowable refrigerant leakage amount for each indoor unit based on its unique space characteristics. This allows the air conditioner to accurately detect and prevent refrigerant leaks that could compromise performance or safety in specific environments. The system includes a refrigerant leak detection unit that monitors refrigerant flow into the indoor space, and a control unit that blocks refrigerant flow when leakage exceeds the determined maximum allowable amount. The control unit can be configured to select different reference leakage amounts for each indoor unit, enabling precise adaptation to different space conditions.

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Sealed heat exchanger with enhanced side sealing for laboratory applications. The heat exchanger features a sealed outer wall that abuts and seals against the water supply and drainage main pipes, providing airtight protection against gas leakage. This design addresses common issues in laboratory heat exchangers where gas flow through the heat transfer zone can compromise experimental accuracy.

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Air conditioner with enhanced refrigerant leak detection and control. The system employs a relay-based approach to manage refrigerant flow through the indoor units while maintaining optimal system performance. When refrigerant leakage is detected, the system automatically switches to a controlled operation mode where the liquid and gas valves are closed, while maintaining the indoor expansion valve open. This configuration ensures that refrigerant leakage is minimized while preventing refrigerant flow through the indoor units. The system continuously monitors refrigerant temperatures in the indoor units to determine if leakage has persisted after the initial control action.

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Air-conditioning system with leak detection and automatic control that balances comfort and safety through refrigerant monitoring and protection. The system features a refrigerant circuit with leak detection through temperature monitoring, a leak detection and cutoff device, and a control device that combines these functions to prevent refrigerant loss while maintaining system performance.

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Air conditioner that suppresses the leakage of refrigerant into a room. The air conditioner includes a refrigerant circuit in which a compressor, a heat source side heat exchanger, a first shutoff device, an expansion unit, a use side heat exchanger and an accumulator are connected by refrigerant piping, and a use side heat exchanger and an accumulator are connected by refrigerant piping, and a flow path switching device in which a refrigerant leaks.

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