Perspiration Simulator with Variable Cavity Heat Block
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Solution Overview
Problem
Existing devices for simulating human body perspiration, particularly vapor phase perspiration, either allow excessive evaporation or require complex structures, failing to accurately adjust the quantity of evaporation to match human body conditions.
Innovation Solution
A perspiration simulator comprising a porous plate with a uniform heat block having open top cavities of varying cross-sectional area, a heating device, and a water supply system to control the water level in the cavities, allowing for adjustable evaporation by changing the water surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a porous plate with heating is used for vapor generation, then the device structure is simple, but the quantity of evaporation cannot be adjusted and is excessively large compared to human body perspiration
Solution Approach 1:
The heating device is divided into multiple independent heating units, each corresponding to a separate cavity. This segmentation allows independent control of water supply and heating for each cavity, enabling precise adjustment of evaporation quantity to match human body perspiration rates while maintaining structural simplicity.
Solution Approach 2:
The system transitions from a static heating surface to a dynamic water supply system where water levels in cavities can be adjusted. By dynamically controlling the water supply amount to each cavity, the evaporation quantity can be precisely regulated to match physiological perspiration conditions.
2Quantity of substance
If a complex vapor supply device with multiple components is used, then the quantity of evaporation can be adjusted, but the device structure becomes rather complex
Solution Approach 1:
The heating function and water supply function are merged into an integrated system where each cavity serves both as a water reservoir and a heating chamber. This combination eliminates the need for separate vapor generation components, simplifying the overall device structure while maintaining adjustable evaporation control.
Solution Approach 2:
The cavities serve multiple functions: they store water, provide heating surface area, and enable evaporation control. This multi-functionality reduces the need for additional specialized components, achieving adjustable evaporation quantity without increasing device complexity.
3Quantity of substance
If the water surface area in cavities is increased, then the quantity of evaporation increases, but the water supply control complexity increases
Solution Approach 1:
Each cavity is designed with specific local characteristics (different cross-sectional areas, depths, and shapes) to provide different evaporation rates. This local differentiation allows precise control of evaporation quantity at each location without requiring complex centralized control systems.
Solution Approach 2:
The system controls evaporation quantity by changing physical parameters of the cavities (water level height, cross-sectional area) rather than adding complex control mechanisms. By adjusting these geometric parameters, precise control over evaporation rate is achieved while maintaining simple water supply control.
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
Enables simulation of human body vapor phase perspiration and adjustment of evaporation quantity to match insensible perspiration rates, with the ability to also simulate liquid phase perspiration in a single device.
Implementation Method 1
a heating device heating the uniform heat block
Implementation Method 2
Moisture supplied to the heated porous metal plate evaporates and passes through the film as vapor
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A perspiration simulator (1) comprises a porous plate (2) provided horizontally and allowing vapor to pass through, a uniform heat block (3) fixed in contact with the underside of the porous plate (2) and comprising one or more open top cavities (31) of which the area in cross-section parallel to the underside of the porous plate (2) changes in the vertical direction, a heating device (4) heating the uniform heat block (3), a vapor phase perspiration tank (5) holding water, a water level sensor (6) detecting the water level of water in the vapor phase perspiration tank (5), and a vapor phase perspiration liquid delivery pump (7) supplying water in the vapor phase perspiration tank (5) to the cavities (31) and controlling the water level in the cavities (31).