Concentric PCA Hose Assembly for Aircraft Air Temperature Retention
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Solution Overview
Problem
Aircraft conditioned air supply systems face challenges in maintaining desired temperatures due to thermal loading issues in hoses, which result in inefficient energy use and the need for larger supply units, especially in varying ambient conditions.
Innovation Solution
A self-insulating air delivery system utilizing a three-layer dual counterflow air delivery/insulation arrangement with concentric hoses and a reversing connector to maintain air temperature, featuring a PCA unit, a starting section, and a three-layered hose assembly with parallel and counterflow insulating air layers to minimize heat transfer from the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single-layer hose is used to deliver conditioned air, then the system is simple and easy to manufacture, but the air temperature cannot be maintained due to thermal loading from the environment
Solution Approach 1:
The patent implements a three-layer concentric hose assembly where the supply hose is nested within an intermediate insulating hose, which is in turn nested within an exterior insulating hose. This nested structure creates multiple annular air spaces that provide thermal insulation, maintaining the conditioned air temperature while protecting against environmental thermal loading.
Solution Approach 2:
The hose assembly is segmented into three distinct functional layers: a supply hose for air delivery, an intermediate insulating hose with parallel airflow, and an exterior insulating hose with counterflow. This segmentation allows each layer to perform its specific function, with the intermediate and exterior layers providing thermal insulation through their respective airflow mechanisms.
2Temperature
If the ground-based supply system compensates for thermal loss by supplying air at a substantially colder/warmer temperature, then the desired air temperature can be maintained at the aircraft, but larger supply units and excess energy are required
Solution Approach 1:
The intermediate insulating hose acts as a thermal mediator between the supply hose and the exterior environment. It introduces parallel airflow that creates a thermal barrier, reducing heat transfer between the conditioned air and the environment. This intermediary layer significantly reduces thermal loss without requiring the supply system to over-compensate with excessive energy input.
Solution Approach 2:
The system converts the potential harm of environmental thermal loading into a beneficial insulation mechanism. By introducing parallel and counterflow air layers in the intermediate and exterior hoses, the system creates thermal barriers that actively resist heat transfer, turning the hose structure from a thermal conduit into a thermal insulator.
3Loss of energy
If a three-layer dual counterflow arrangement is used to maintain air temperature, then energy consumption is reduced and air temperature is maintained, but the device complexity increases
Solution Approach 1:
The intermediate and exterior insulating hoses serve multiple functions: they provide structural protection for the supply hose, create thermal insulation barriers through parallel and counterflow mechanisms, and manage environmental thermal loading. This multi-functionality reduces the need for separate insulation components, thereby limiting the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively maintains the desired air temperature, reducing energy consumption and the need for larger supply units by insulating the conditioned air from external thermal influences, ensuring it arrives at the aircraft closer to the intended temperature.
Implementation Method 1
The first annular insulating air layer between the supply hose and the interior insulating hose with a parallel insulating airflow
Implementation Method 2
The second, counterflow, annular insulating air layer between the first insulating hose and a second, exterior, insulating hose. The airflow in the second annular insulating air layer travels in the opposite direction
Implementation Method 3
A self-insulating air delivery system utilizing a three-layer dual counterflow air delivery/insulation arrangement with concentric hoses
Data Source
AI summary
A self-insulating air delivery and recirculation system maintains a desired air temperature of the conditioned air supplied thereinto for delivery to an aircraft. The system uses insulating airflow layers; a parallel layer and a counterflow layer. A starting section connects to a PCA unit and delivers conditioned air therefrom to an interior supply hose. The starting section supplies conditioned insulating air to an interior insulating hose that is annularly outward of the supply hose and in which air flows parallel to airflow in the supply hose. A reversing connector indirectly connects the supply hose to the aircraft and reverses the flow of air from the interior insulating hose to flow back toward the PCA unit in an exterior counterflow hose that is annularly outward of the interior insulating hose and connects at its far end to provide intake airflow to the PCA unit.