Air Conditioning Shutoff Valve Zoning for Refrigerant Leak Isolation
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Solution Overview
Problem
Existing air conditioning systems lack reliable and efficient leak detection and remediation capabilities, particularly in larger buildings, leading to potential safety hazards for users.
Innovation Solution
An air conditioning system with integrated leak safety features, including a compressor unit, indoor units, a switching unit with shutoff valves, leak detection sensors, and a controller that associates each shutoff valve with at least one leak detection sensor, allowing for automatic shut-off of refrigerant flow upon leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple discrete shutoff valves are distributed throughout the system, then leak detection coverage is improved, but device complexity increases
Solution Approach 1:
The system divides the air conditioning network into multiple zones, each equipped with its own shutoff valve and leak detection sensor. This segmentation allows localized leak detection and isolation, improving reliability by ensuring that a leak in one zone does not compromise the entire system while maintaining manageable complexity through modular organization.
Solution Approach 2:
A central controller acts as an intermediary that receives signals from multiple leak detection sensors and activates the appropriate shutoff valves. This mediator coordinates the complex interactions between sensors and valves, managing system complexity by centralizing the decision-making logic while enabling comprehensive leak detection coverage across all zones.
2Measurement precision
If leak detection sensors are installed in every room, then detection precision is improved, but device complexity increases
Solution Approach 1:
Leak detection sensors are strategically positioned in locations where refrigerant leaks are most likely to occur or be detected, such as near indoor units and along refrigerant lines. This localized placement optimizes detection precision in critical areas without the need for sensors in every room, thereby reducing overall system complexity while maintaining effective leak detection capability.
3Speed
If automatic shutoff valve actuation is implemented, then response speed is improved, but device complexity increases
Solution Approach 1:
Shutoff valves are pre-positioned at strategic locations throughout the system, and their association with specific zones and sensors is established in advance through the controller's memory. When a leak is detected, the controller can immediately activate the appropriate valve without delay for manual intervention or complex real-time calculations, achieving fast response speeds while managing control complexity through pre-configured associations.
4Reliability
If comprehensive leak detection coverage is achieved, then reliability is improved, but ease of operation worsens
Solution Approach 1:
The controller receives feedback signals from leak detection sensors and automatically activates the appropriate shutoff valves. This closed-loop feedback system ensures comprehensive leak detection coverage and rapid response while simplifying operation, as the system automatically manages the complex coordination between sensors and valves without requiring manual intervention or complex user configuration.
Data Source
AI summary
The current invention relates to an Air conditioning system comprising compressor unit connected to a plurality of indoor by means of a plurality of pipes: a switching unit between the outdoor unit and each indoor unit, said switching unit comprising a plurality of shutoff valves; a plurality of leak detection sensors; and a controller configured to control the plurality shutoff valves and have information of associating each of the shutoff valves to at least one sensor. In order to safely and efficiently manage refrigerant leaks, the shutoff valves are operated based on information from their associated sensors.