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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 chamber, also in °C.
- V denotes the internal volume of the ventilation aging test chamber, in liters (L).
- D is the density of ambient air during the test, measured in grams per liter (g/L).
Using this formula, once P1, T1, and T2 are measured, the value of D can be determined from a reference table. By adjusting the valve opening, P2 can be controlled and measured accordingly. This allows for precise calculation of N, ensuring that the number of air exchanges falls within the required range of 8 to 20 times per hour. Once this is confirmed, the ventilation aging test chamber meets the necessary standards for air exchange performance.
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 achieve a minimum of 8 to 20 air exchanges per hour at the specified test temperature. To ensure compliance with this requirement, an accurate formula is used to calculate the number of air changes within the chamber. The formula is as follows: