According to the requirements of the industry standard JB/T4278.6-93 of the Ministry of Machinery Industry. At the specified test temperature, the total number of air exchanges in the tank is 8 to 20 times per hour. The formula for calculating the number of air changes in the ventilation aging test chamber is as follows:
among them:
N--gas exchange times, times/hours;
P1--the average power when the valve is closed, W;
P2--the average power when the valve is open, W;
T1--ambient temperature, °C;
T2--tank temperature, °C;
V--the internal volume of the ventilation aging test chamber, L;
D-- Ambient air density at the test, g/L.
According to the above formula, as long as P1, t2, and t1 are measured, d can be obtained by looking up the table, and by adjusting the degree of valve opening, and obtaining and measuring the appropriate P2, it can be calculated to meet the prescribed 8-20 times/hour change. The number of air is counted, and it is determined that the index of the number of air changes in the ventilation aging test chamber is qualified.
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