Vacuum Solar Panel Pressure Indicator for Vacuum Loss Detection
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Solution Overview
Problem
Vacuum solar thermal panels face challenges in detecting internal pressure increases above 1.33 Pa (10^-2 Torr) due to getter saturation or sealing damage, leading to efficiency degradation, as visual inspections are insufficient and attaching high vacuum gauges is costly.
Innovation Solution
A vacuum solar thermal panel with a pressure indicator spot of reactive material, such as elemental barium, deposited on the inner side of the front plate, which reacts visibly when internal pressure exceeds the threshold, allowing for timely replacement and maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high vacuum gauge is attached to every panel to detect internal pressure, then measurement precision is improved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The invention extracts the detection function from a complex external gauge instrument and implements it through a simple reactive material spot deposited directly on the front plate. The reactive material (e.g., barium) serves as a standalone indicator that changes appearance when pressure exceeds the threshold, eliminating the need for attached gauges while maintaining detection capability.
Solution Approach 2:
The reactive material spot acts as a disposable, low-cost indicator embedded in the panel. Instead of using expensive, complex, and durable gauge instruments on every panel, the invention employs inexpensive reactive material that provides sufficient detection functionality for the application's needs.
2Ease of operation
If a large amount of reactive material is deposited on the front plate to improve pressure detection visibility, then ease of operation is improved, but transparency of the front plate deteriorates
Solution Approach 1:
The invention applies reactive material in a localized spot rather than uniformly across the entire front plate. This concentrated local application provides sufficient visual indication for pressure detection while minimizing the impact on overall plate transparency and solar radiation transmission.
Solution Approach 2:
The invention uses a partial amount of reactive material - just enough to create a visible indicator spot for pressure detection, rather than coating the entire surface. This partial application achieves the detection function without excessive material that would compromise transparency.
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 solution provides a cost-effective and accurate method to detect pressure increases, ensuring timely replacement and maintaining panel efficiency by using a small reactive material spot that changes color or size when pressure reaches critical levels, without affecting transparency or functionality.
Implementation Method 1
When the pressure within said envelope exceeds a threshold, the reactive material undergoes a reaction noticeable from the outside of the vacuum-tight envelope
Implementation Method 2
As barium quickly reacts with the gas molecules entering the vacuum envelope, with the pressure increase the barium spot will reduce in size
Data Source
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Figure 2
AI summary
The present application relates to a vacuum solar thermal panel (1) of the type comprising: a vacuum-tight envelope (10), having at least a front plate (11) transparent to solar radiation and a support structure (12) for said front plate (11); heat-absorbing means enclosed within said vacuum-tight envelope (10); and main getter means for keeping a vacuum condition within the vacuum envelope (10); wherein the vacuum solar thermal panel (1) further comprises a pressure indicator spot (13) of reactive material deposited on an inner side of said front plate (11), said reactive material undergoing a reaction noticeable from the outside of the vacuum-tight envelope (11) when the pressure within said envelope exceeds a given threshold.