The temperature change rate of a constant temperature and humidity test chamber refers to the conversion rate between two given temperatures measured at the center of the chamber, expressed in ℃/min. It is one of the key parameters for measuring the performance of a constant temperature and humidity test chamber, but do you know how it is calculated?
The testing point for heating and cooling rates is designated as the geometric center point of the workspace.
Usually, there are two modes: no load or no load, where no sample is placed in the test space. And the load needs to meet the following three points simultaneously:
The total mass of the test chamber load shall not exceed 80kg per cubic meter of working air volume
2. The total volume of the load shall not exceed 1/5 of the studio volume
3. On any section perpendicular to the dominant wind direction, the sum of the load areas should not exceed 1/3 of the cross-sectional area of the working chamber at that location. When placing the load, the airflow should not be obstructed.
Temperature rise and cooling rate test procedure for constant temperature and humidity test chamber:
Within the adjustable temperature range of the test chamber, select the lowest nominal temperature as the lowest cooling temperature, and the highest nominal temperature as the high and high heating temperature.
Turn on the cold source, lower the temperature of the test chamber from room temperature to the lowest cooling temperature, stabilize for at least 2 hours, and then rise to the highest specified temperature. Test the time it takes for the temperature inside the chamber to rise from 10% of the temperature range to 90%. Raise the temperature of the test chamber from room temperature to the maximum cooling temperature, stabilize for at least 2 hours, and then lower to the minimum specified temperature. Measure the time it takes for the temperature inside the chamber to rise from 90% of the temperature range to 10%. During the heating and cooling periods, record once per minute until the end of the test process.
The calculation formula is: (set low temperature+set maximum temperature) ÷ temperature transition speed=temperature transition time (minutes) Example: The condition is -40 to 100 ℃, with a linear temperature increase or decrease of 5 ℃ per minute. The calculation formula is (40+100) ÷ 5=28 minutes/which means only 5 ℃ changes per minute.
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