Respirator Phase Change Material Thermal Regulation
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Solution Overview
Problem
Respirators often trap heat and moisture, leading to discomfort for the wearer due to inadequate heat and moisture dissipation, causing the wearer to remove the mask and exposing themselves to harmful contaminants.
Innovation Solution
Incorporation of micro-encapsulated phase change materials into the respirator's components, such as the seal contact area, filter layer, and harness assembly, which absorb heat and provide cooling by melting at body temperature, and release heat in low temperatures to maintain thermal regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If valves are used to allow air exchange through the respirator, then oxygen intake and carbon dioxide discharge are improved, but heat and moisture dissipation remains insufficient leading to wearer discomfort
Solution Approach 1:
The patent incorporates phase change material (PCM) into the respirator structure that undergoes phase transition (melting/freezing) at temperatures near body temperature. During melting, the PCM absorbs excess heat from the wearer's face and exhaled air, providing active cooling. During freezing, it releases stored heat, preventing overheating. This phase transition mechanism directly addresses the heat dissipation deficiency of conventional valve systems while maintaining air exchange functionality.
Solution Approach 2:
The respirator combines multiple materials with complementary functions: filter media for particle filtration, valves for air exchange, and phase change material for thermal regulation. This composite structure integrates filtration, ventilation, and thermoregulation into a single system, resolving the contradiction between air exchange efficiency and heat dissipation by allowing each component to perform its specialized function synergistically.
2Reliability
If the respirator is worn continuously to protect against contaminants, then protection reliability is improved, but thermal discomfort increases leading to removal of the respirator
Solution Approach 1:
The phase change material continuously regulates temperature through phase transitions, absorbing heat when the wearer's face becomes hot and releasing it when cooling is needed. This passive thermal regulation maintains comfortable wearing conditions over extended periods, eliminating the need to remove the respirator for cooling breaks while preserving continuous contaminant protection.
Solution Approach 2:
The phase change material serves itself by automatically responding to temperature changes without external control. When the wearer's face temperature rises, the PCM melts and absorbs heat; when temperature drops, it freezes and releases heat. This self-regulating mechanism continuously adapts to the wearer's thermal needs, maintaining comfort and protection simultaneously without requiring user intervention or power sources.
3Temperature
If the phase change material melts at body temperature to provide cooling, then thermal comfort is improved, but the material requires specific temperature control to function effectively
Solution Approach 1:
The patent selects phase change materials with melting points specifically tailored to match or slightly exceed normal body temperature (around 37°C). This parameter selection ensures the PCM remains solid during normal wearing conditions, absorbing heat through controlled melting only when thermal buildup occurs. The specific melting point parameter is optimized to provide cooling exactly when needed while maintaining structural integrity during normal operation.
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 phase change materials enhance wearer comfort by dissipating heat and moisture, reducing the urge to remove the respirator, while providing thermal regulation to prevent exposure to harmful contaminants.
Implementation Method 1
the phase change material is configured to provide localized cooling by absorbing heat emitted by the wearer, the phase change material melting at a temperature that is proximate to at least one of an exhalation air temperature of the wearer or a body temperature of the wearer
Implementation Method 2
the phase change material melts at a temperature between 30 °C and 40 °C... the phase change material is configured to provide localized cooling by absorbing heat emitted by the wearer
Implementation Method 3
in low ambient temperatures the melted phase change material solidifies and releases heat to provide heating for the wearer
Data Source
Figure 1~2
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Figure 7~11
AI summary
A respirator includes a frame, a filter layer, and a face seal member. The frame has an outer side and an inner side. The frame defines an opening therethrough. The filter layer is mounted to the outer side of the frame and covers the opening of the frame. The filter layer is configured to prohibit permeation of aerosol, gas, and/or vapor contaminants therethrough. The face seal member is mounted to the inner side of the frame. The face seal member includes a seal contact area configured to engage a facial surface of a wearer. The face seal member incorporates a phase change material therein. The phase change material is configured to provide localized cooling by absorbing heat emitted by the wearer.