Test Chamber Temperature Control via Air Profile Comparison
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Solution Overview
Problem
Existing temperature control methods in test chambers struggle to reliably ensure that test materials are subjected to the specified thermal stress due to factors like the material's mass, heat capacity, and air flow, making it cumbersome and time-consuming to achieve desired temperature profiles without additional sensors.
Innovation Solution
A method using a control device with a temperature sensor to record and compare temperature curves with and without test material, allowing for adjustments to the test sequence based on the influence of the test material, thereby ensuring accurate temperature control without additional sensors on the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are attached to the test specimen to directly monitor its surface temperature, then measurement precision is improved, but device complexity and ease of operation deteriorate due to the need for sensor attachment and procedure adjustment
Solution Approach 1:
The patent introduces air temperature as an intermediary parameter to indirectly determine specimen temperature. Instead of directly measuring specimen surface temperature with sensors, the system measures air temperature and uses pre-determined relationships between air temperature and specimen temperature (based on heat capacity categories) to infer specimen temperature, thereby avoiding direct sensor attachment while maintaining measurement capability
Solution Approach 2:
The patent creates a simplified model or copy of the temperature measurement process by establishing predetermined relationships between air temperature and specimen temperature. Rather than physically attaching sensors to each specimen, the system uses a modeled approach where air temperature measurements serve as a proxy, and the relationship is copied from calibration data or theoretical models based on specimen heat capacity
2Reliability
If the test sequence is adjusted to account for specimen properties like mass and heat capacity, then temperature control reliability is improved, but ease of operation and productivity deteriorate due to the need for manual procedure correction
Solution Approach 1:
The patent enables the testing system to automatically adjust for specimen properties without requiring operator intervention. The control device automatically determines the specimen's heat capacity category based on air temperature measurements and automatically selects or adjusts the appropriate test sequence, eliminating the need for operators to manually correct procedures while maintaining reliable temperature control
Solution Approach 2:
The system implements feedback by continuously monitoring air temperature and using this information to automatically adjust the test sequence. The control device compares actual air temperature measurements with expected values and automatically modifies heating/cooling rates or holding times based on the determined specimen heat capacity category, ensuring reliable temperature control without manual intervention
3Productivity
If the test chamber is equipped with air circulation to speed up temperature changes, then productivity is improved, but temperature control reliability deteriorates for specimens with high heat capacity that are poorly exposed to airflow
Solution Approach 1:
The patent applies dynamic adjustment of test parameters based on real-time measurements. The control device determines the specimen's heat capacity category from air temperature measurements and dynamically adjusts the test sequence parameters (heating rate, cooling rate, holding time) to match the specimen's thermal characteristics, ensuring reliable temperature control while maintaining productivity through optimized air circulation
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 method enables simple and cost-effective temperature testing by determining the test material's heat capacity and adjusting the test sequence to achieve desired temperature changes, ensuring the test material is adequately tempered, reducing the need for direct temperature sensors on the material and improving the reliability of temperature control.
Implementation Method 1
the air temperature in the test chamber is detected by means of a temperature sensor of the control device
Implementation Method 2
heat exchangers are located to heat or cool the air flowing through it
Implementation Method 3
A fan draws in the air from the test chamber and directs it to the respective heat exchangers via the duct
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to a method for temperature control of test material in a test chamber (10) and to a test chamber, in particular a climate chamber, wherein an air temperature in a test space (11) of the test chamber is controlled by means of a control device of the test chamber, wherein test material (12) is arranged in the test space and a temperature change is generated in the test space in a test period according to a predetermined test sequence, wherein the air temperature in the test space is detected by means of a temperature sensor (18, 19) of the control device, wherein a temperature profile of the air temperature during the test period with test material arranged in the test space is detected and stored by the control device, wherein in the test space without test material, the temperature change is generated in a further test period according to the predetermined test sequence.wherein a further temperature profile of the air temperature during the further test period with the test item-free test chamber is recorded and stored by the control device, whereby a comparison of the respective temperature profiles is carried out by means of the control device.