The temperature test method developed in the high-low temperature box (machine) standard The temperature test method of the high/low temperature box, which includes: test procedure, location and number of test points, data processing, and test results.
test program:
In the test chamber temperature adjustable range, select the highest nominal temperature and the lowest nominal temperature.
The test chamber was run at a low temperature and high temperature. The temperature at the center point of the workspace reaches the test temperature and is stable for 2 h. The temperature of all test points is tested once every 30 min for a total of 30 times.
The location and number of test points:
In the chamber of the test chamber, the upper, middle and lower levels of the test surface are defined, referred to as upper, middle and lower levels. The distance between the upper floor and the top of the studio is one-tenth the height of the studio, the middle floor passes through the geometric center of the studio, and the lower floor is 10mm above the lowest shelf.
The test points are located on three test surfaces. The center test point is located at the center of the studio geometry. The distance from the rest of the test points to the studio wall is 1/10 of the length of each side. However, the distance is not greater than 1m3 for the test chamber. Not less than 50mm
Data processing and test results:
The measured temperature data is corrected according to the test meter's correction value.
Remove suspicious data for data measured during the constant temperature phase:
Calculate the average temperature of the measured value of 30 points per equation according to formula (1): T? = 1/n?_(i=1)^n?Ti....................................(1)
In the formula:
T?? The average temperature in degrees Celsius (°C);
Ti - the ith test value in degrees Celsius (°C);
N - number of measurements.
Calculate the temperature gradient according to Equation (2): ?T?_j=T?hT?L..........................................(2)
In the formula:
T?_j - temperature gradient in degrees Celsius (°C);
T?h - the maximum value of the average temperature in degrees Celsius (°C);
T?L - the minimum value of the average temperature in degrees Celsius (°C).
Calculate the temperature fluctuation according to formula (3): ?T_b=T_ih-T_iL.......................................................(3)
In the formula:
T_b - temperature fluctuation in degrees Celsius (°C);
T_ih - the maximum temperature value of the i-th point of the workspace, in degrees Celsius (°C);
T_iL—The lowest temperature value of the i-th point of the workspace, in degrees Celsius (°C);
Calculate temperature deviation according to equation (4): ?T_i=T?iT?o.......................................................(4)
In the formula:
T_i - temperature deviation in degrees Celsius (°C);
T?o - the average temperature in the center of the workspace, in degrees Celsius (°C);
T?i—The average temperature at other points in the workspace in degrees Celsius (°C).
The difference between the set value of the high and low temperature box control instrument and the central test value shall meet the allowable deviation requirements in the test box performance items and indicators. The above calculation results shall comply with the provisions therein.
According to actual needs, assess the uncertainty of the measurement results.
Door sealing performance test method refers to when the test box according to the standard before and after the beginning and after the completion of the inspection once, the thickness of 0.1mm, width 50mm, 200mm long paper hanging down to the ground between the door frame and the door seal In any part of the box, after closing the door, gently pull the paper by hand. If it does not slide freely, it means that the door seal is good.
The test method for the sealing performance of refrigeration systems is to check the cooling system piping joints with halogen lamps or soap liquids for signs of no leakage.
In the noise test method, the noise of the whole machine should not exceed 80dB (A), showing TB/T9515-1999.
The appearance quality test method is visual inspection. It should be checked once before and after the start of the standard. Appearance The coating should be smooth, uniform in color, and must not have exposed bottoms, blisters, layers or scratches.
test program:
In the test chamber temperature adjustable range, select the highest nominal temperature and the lowest nominal temperature.
The test chamber was run at a low temperature and high temperature. The temperature at the center point of the workspace reaches the test temperature and is stable for 2 h. The temperature of all test points is tested once every 30 min for a total of 30 times.
The location and number of test points:
In the chamber of the test chamber, the upper, middle and lower levels of the test surface are defined, referred to as upper, middle and lower levels. The distance between the upper floor and the top of the studio is one-tenth the height of the studio, the middle floor passes through the geometric center of the studio, and the lower floor is 10mm above the lowest shelf.
The test points are located on three test surfaces. The center test point is located at the center of the studio geometry. The distance from the rest of the test points to the studio wall is 1/10 of the length of each side. However, the distance is not greater than 1m3 for the test chamber. Not less than 50mm
Data processing and test results:
The measured temperature data is corrected according to the test meter's correction value.
Remove suspicious data for data measured during the constant temperature phase:
Calculate the average temperature of the measured value of 30 points per equation according to formula (1): T? = 1/n?_(i=1)^n?Ti....................................(1)
In the formula:
T?? The average temperature in degrees Celsius (°C);
Ti - the ith test value in degrees Celsius (°C);
N - number of measurements.
Calculate the temperature gradient according to Equation (2): ?T?_j=T?hT?L..........................................(2)
In the formula:
T?_j - temperature gradient in degrees Celsius (°C);
T?h - the maximum value of the average temperature in degrees Celsius (°C);
T?L - the minimum value of the average temperature in degrees Celsius (°C).
Calculate the temperature fluctuation according to formula (3): ?T_b=T_ih-T_iL.......................................................(3)
In the formula:
T_b - temperature fluctuation in degrees Celsius (°C);
T_ih - the maximum temperature value of the i-th point of the workspace, in degrees Celsius (°C);
T_iL—The lowest temperature value of the i-th point of the workspace, in degrees Celsius (°C);
Calculate temperature deviation according to equation (4): ?T_i=T?iT?o.......................................................(4)
In the formula:
T_i - temperature deviation in degrees Celsius (°C);
T?o - the average temperature in the center of the workspace, in degrees Celsius (°C);
T?i—The average temperature at other points in the workspace in degrees Celsius (°C).
The difference between the set value of the high and low temperature box control instrument and the central test value shall meet the allowable deviation requirements in the test box performance items and indicators. The above calculation results shall comply with the provisions therein.
According to actual needs, assess the uncertainty of the measurement results.
Door sealing performance test method refers to when the test box according to the standard before and after the beginning and after the completion of the inspection once, the thickness of 0.1mm, width 50mm, 200mm long paper hanging down to the ground between the door frame and the door seal In any part of the box, after closing the door, gently pull the paper by hand. If it does not slide freely, it means that the door seal is good.
The test method for the sealing performance of refrigeration systems is to check the cooling system piping joints with halogen lamps or soap liquids for signs of no leakage.
In the noise test method, the noise of the whole machine should not exceed 80dB (A), showing TB/T9515-1999.
The appearance quality test method is visual inspection. It should be checked once before and after the start of the standard. Appearance The coating should be smooth, uniform in color, and must not have exposed bottoms, blisters, layers or scratches.
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