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In this formula:
- **N** represents the number of air exchanges per hour.
- **P1** is the average power when the valve is closed, measured in watts (W).
- **P2** is the average power when the valve is open, also in watts (W).
- **T1** refers to the ambient temperature in degrees Celsius (°C).
- **T2** is the temperature inside the test chamber, also in °C.
- **V** denotes the internal volume of the ventilation aging test chamber, in liters (L).
- **D** stands for the density of ambient air during testing, in grams per liter (g/L).
By using this formula, once P1, T1, and T2 are measured, the value of D can be determined from reference tables. Adjusting the valve opening allows for the measurement of an appropriate P2. With these values, the air exchange rate can be calculated to meet the required range of 8 to 20 times per hour. This ensures that the ventilation aging test chamber meets the necessary standards for air exchange performance, confirming its compliance with the industry specifications.
Formula for calculating the number of air changes in the ventilation aging test chamber
According to the industry standard JB/T4278.6-93 issued by the Ministry of Machinery Industry, the ventilation aging test chamber must ensure a minimum of 8 to 20 air exchanges per hour at the specified test temperature. To calculate the number of air changes, the following formula is used: