Staged Heat Pump Cooling Loop for Lightweight Aircraft Thermal Control

The patent combines multiple standalone vapor cycle units into a single centralized thermal management system that serves multiple climate-controlled regions. The centralized system includes one compressor, one condenser, one expansion device, and one evaporator that collectively provide cooling to multiple regions through a shared refrigerant loop, thereby reducing overall system weight while maintaining comprehensive cooling coverage.

The centralized thermal management system performs multiple cooling functions for different climate-controlled regions simultaneously through a single system. The refrigerant is distributed to multiple evaporators located in different regions, allowing one system to fulfill the roles of multiple standalone units, thus improving adaptability and versatility without proportionally increasing weight.

The patent segments the centralized thermal management system into modular components including the compressor, condenser, expansion device, evaporator, and multiple distribution loops. Each component is optimized for its specific function, and the system uses staged cooling with intermediate heat exchangers to reduce refrigerant volume requirements in each segment, thereby reducing overall system weight while maintaining centralized operation.

The system employs staged cooling that changes refrigerant parameters (temperature and pressure) at different stages of the cooling process. By using intermediate heat exchangers and expansion devices at different points in the refrigerant loop, the system optimizes refrigerant density and volume at each stage, reducing the total refrigerant quantity needed compared to a single-stage centralized system.

The patent segments the total cooling capacity into multiple smaller cooling stages distributed along the refrigerant loop. Instead of using one large evaporator, the system uses multiple evaporators and intermediate heat exchangers that provide cooling in stages, allowing the total cooling capacity to be achieved with smaller, lighter components distributed throughout the system.

The system changes refrigerant parameters through staged expansion and cooling processes. By using multiple expansion devices and heat exchangers at different stages, the refrigerant progressively changes temperature and pressure, extracting cooling capacity incrementally at each stage. This approach achieves high total cooling capacity while using less refrigerant volume and lighter components compared to a single large-stage system.