Air Exchange Rate Test for Air Exchange Aging Test Chamber
Test Procedure
1. Seal all ventilation holes, doors, thermometer holes, and gaps
around the blower (most surfaces can be effectively sealed with
pressure-sensitive tape). Connect a standard watt-hour meter to the
aging chamber's power system.
2. Control the working chamber temperature of the aging test
chamber to 80±2℃ above the ambient temperature. The temperature
inside the working chamber is measured from the central test point.
The ambient temperature is measured 2m away from the aging chamber,
at least 1m away from other surrounding objects, at a position
nearly level with the aging chamber's air inlet.
3. When the temperature at the test point in the working space
first reaches the control temperature and stabilizes for 2 hours,
measure the electrical energy consumed by the aging chamber within
60 minutes.
4. Remove all seals, open the air exchange port, and follow the
methods described in Article 2 and Article 3 to measure the
electrical energy consumed by the aging chamber within 60 minutes
(if the air exchange rate does not meet the specified range,
readjust the ventilation opening).
Calculation of Test Results
5. Using the measured temperatures inside the chamber and the
ambient temperature when the aging test chamber's air exchange port
is sealed or open, calculate the arithmetic averages respectively.
Convert the measured electrical energy consumption into average
power.
N = 3590 • (P2 - P1) / V • d • △T
Where: N ----- Air exchange rate, times/hour;
P1 ---- Average electrical power consumed when sealed, W;
P2 ---- Average electrical power consumed when open, W;
△T --- Difference between the arithmetic average of the temperature
inside the chamber and the ambient temperature, ℃;
V ---- Working chamber volume, L;
d ----- Density of air at the surrounding ambient temperature, g/L.
The calculation result of the above formula should meet the
following requirements:
Air Exchange Rate
Forced convection type: Divided into two types, up to 100
times/hour; 100 ~ 200 times/hour should be adjustable.
