Dual-Envelope Aerostat Venting for Buoyant Gas Heat Isolation
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Solution Overview
Problem
Lighter than air vehicles face limitations in their airborne duration due to heat generated by onboard equipment, which can cause the buoyant gas to heat up and expand, requiring complex pressure management systems and potentially leading to unwanted lift and drag issues.
Innovation Solution
The design incorporates a dual-envelope structure with cooling tubes that allow ventilation to prevent heating of the buoyant gas, using transparent, gas-tight materials and a power generation system that focuses sunlight onto solar panels within the inner envelope, while also allowing for the rotation and positioning of devices like cameras to optimize energy generation and reduce overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If heat generating apparatus is placed within the second envelope, then the functional capabilities of the vehicle are improved, but the temperature of the buoyant gas increases
Solution Approach 1:
The vehicle is divided into two separate envelopes: a first envelope containing the buoyant gas and a second envelope containing the heat-generating apparatus. This segmentation physically isolates the heat source from the buoyant gas, allowing functional capabilities to be enhanced without compromising gas temperature stability.
Solution Approach 2:
The second envelope (containing heat-generating apparatus) is nested inside the first envelope (containing buoyant gas). This nested structure allows the heat-generating apparatus to be protected and positioned while maintaining spatial separation through the envelope walls, thus preventing direct thermal coupling between the apparatus and the buoyant gas.
2Force
If the buoyant gas is heated, then the lift of the vehicle increases, but the pressure management complexity increases
Solution Approach 1:
The heat-generating apparatus is extracted from the buoyant gas environment and placed in a separate second envelope. This extraction prevents the apparatus from heating the buoyant gas, thereby eliminating the need for complex pressure management systems to compensate for thermal expansion and maintain lift stability.
3Temperature
If the tube allows ventilation, then the cooling of the second envelope is improved, but the structural complexity increases
Solution Approach 1:
The tube connecting the two envelopes serves multiple functions: it provides structural support between envelopes, enables ventilation for cooling the second envelope, and maintains the sealed environment for both envelopes. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural 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
This configuration extends the operational time of the power generation devices, prevents overheating of the buoyant gas, and reduces the need for complex pressure management systems, thereby improving the efficiency and longevity of the lighter than air vehicle's operations.
Implementation Method 1
A tube connects the first envelope to the second envelope... to allow ventilation of heat generating apparatus within the second envelope... to inhibit heating of the lighter than air gas within the first envelope with heat generated within the second envelope
Implementation Method 2
The mirror may be configured to reflect light that passes through a pellucid part of the first envelope, into the second envelope, via a pellucid part of the second envelope
Implementation Method 3
Lighter than air vehicles, or 'aerostats', use lighter than air gases for buoyancy
Data Source
AI summary
Disclosed is a lighter than air vehicle comprising a first envelope, a second envelope located inside the first envelope, and a tube connecting the first envelope to the second envelope. The first envelope and the second envelope are spaced apart so as to define a chamber between the first envelope and the second envelope. The chamber is filled with a lighter than air gas. A first opening of the tube is located at an external surface of the first envelope. A second opening of the tube is located at an internal surface of the second envelope, the second opening of the tube being at an opposite end of the tube to the first opening of the tube.