Thermal Sensor Casing Seal for Stable Refrigeration Control
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Solution Overview
Problem
First-generation refrigeration systems experience premature compressor starts and stops due to air temperature fluctuations, leading to energy waste and mechanical stress, as they are designed to respond to air temperature rather than product temperature.
Innovation Solution
A heat transfer apparatus with a control system that uses a thermal sensor and a casing with a compressible seal to mimic product temperature, preventing air flow and stabilizing air temperature within the casing, allowing the control apparatus to manage the heat transfer based on accurate temperature data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the thermal sensor is placed directly in the refrigeration cabinet to measure air temperature, then the control system can respond quickly to temperature changes, but the compressor starts and stops prematurely due to air temperature fluctuations rather than product temperature changes
Solution Approach 1:
A thermal sensor housing acts as an intermediary between the thermal sensor and the refrigeration cabinet environment. The housing contains air that thermally couples to the product, allowing the sensor to indirectly measure product temperature trends without being directly exposed to rapid air temperature fluctuations. This mediator approach resolves the contradiction by providing stable temperature measurement for reliable compressor control while maintaining appropriate response characteristics.
Solution Approach 2:
The thermal sensor housing creates a miniature replicated environment that copies the thermal characteristics of the product storage space. By filling the housing with air that equilibrates with product temperature, the system creates a simplified model of the product thermal environment, allowing the sensor to track product temperature changes without directly experiencing the harsh air temperature variations in the cabinet.
2Stability of the object's composition
If the thermal sensor housing is sealed to prevent air flow, then the air temperature inside mimics product temperature, but the housing must be completely airtight which complicates sensor insertion and replacement
Solution Approach 1:
The housing incorporates a dynamic sealing mechanism using a compressible material (such as rubber or foam) that adapts its sealing properties based on sensor presence. When the sensor is inserted, the compressible material deforms to accommodate it while maintaining an effective seal. This dynamic approach allows the housing to transition between open (during installation) and sealed (during operation) states, resolving the contradiction between maintaining stable internal temperature and enabling easy sensor replacement.
Solution Approach 2:
The housing utilizes a flexible seal made of compressible material that can deform elastically to accommodate the thermal sensor. This flexible sealing approach maintains the airtight enclosure necessary for stable internal air temperature while allowing the sensor to be inserted and removed without permanent modification to the housing structure.
3Temperature
If the housing wall thickness is increased to improve thermal insulation, then the air temperature in the housing better mimics product temperature, but the housing becomes larger and more complex
Solution Approach 1:
The housing design optimizes wall thickness as a critical parameter to achieve adequate thermal insulation without excessive size. By carefully selecting the wall thickness parameter and using materials with appropriate thermal conductivity, the housing achieves sufficient thermal mass to track product temperature changes while maintaining a compact form factor. This parameter optimization resolves the contradiction between temperature representation accuracy and structural simplicity.
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 solution reduces energy waste and mechanical stress by stabilizing the air temperature within the casing to match product temperature, improving the operational efficiency of the heat transfer apparatus.
Implementation Method 1
a casing seal connected between the casing cap and the casing wall at the casing entrance, the casing seal comprising a compressible material and an aperture passing through the compressible material... the casing seal is configured to substantially prevent air from flowing into the casing chamber
Implementation Method 2
providing a control apparatus comprising a thermal sensor configured to control operation of the heat transfer apparatus... a thermal sensor located inside the casing and connected to a thermal sensor connection passing through the aperture in the casing seal
Implementation Method 3
a heat transfer apparatus connected to and configured to be controlled by the control apparatus based at least in part on the temperature information
Data Source
AI summary
A method of controlling a heat transfer apparatus comprising the steps of: providing a heat transfer apparatus; providing a control apparatus comprising a thermal sensor configured to control operation of the heat transfer apparatus; providing a casing comprising a casing wall enclosing a casing chamber, a casing entrance, and a casing seal; and inserting the thermal sensor into the casing chamber through the casing entrance an aperture in the casing seal.