The maximum ventilation test of the drying oven uses the following instruments 1. One meter with an accuracy value of not less than 0.5. When using a current transformer to expand the range of the meter, the accuracy of the transformer must not be less than 0.5. 2. Second-class standard mercury hygrometer. 3. A clock (or a watch). The drying box vent hole (suction hole and vent hole) is fully closed. When the temperature of the working space is at a constant temperature of 30±2° C., the average electric power of the test oven 2h is P1; then the vent hole is Fully open, when the temperature of the working space re-enters the constant temperature state (the set value should not change) and then test the average electric power P2 of the drying oven 2h. During the test of the average electric power of the drying oven, the temperature of the drying chamber working space and the ambient temperature were tested once every 1 hour, and each of the six temperature values ​​was obtained, and their average temperatures were respectively calculated. Calculate the maximum air exchange capacity of the drying box as follows: V=3.6(P2-P1)/Cp·a(T2-T1) In the formula: V---the maximum air exchange rate of the drying box m3/h; P1---Average electric power when the vent hole of the drying box is fully closed (excluding the motor power for forced blast) W; P2---the average electric power when the vent hole of the drying box is fully open (excluding the motor power for forced blast) W; T1---the average value of the ambient temperature °C; T2---the average value of the working temperature of the drying oven °C; Cp---air specific pressure specific heat, specified as 1.003W·β/g·°C; a---the air density at a temperature of Tx, g/l. Rotary Hair Brush, a Hot Air Brush was created to replace both blow dryers and wooden hair brushes. Now, instead of holding the devices in both hands, a woman can use a lightweight device that dries and curls (or straightens) hair simultaneously. Rotary Hair Brush,Rotating Air Brush,Rotating Hot Air Brush,Electric Straightening Brush Ningbo Meirou Electric Appliance Co.,Ltd. , https://www.mrhairstraightener.com![Air exchange test of drying oven [JBT15102-2006 Appendix B]](http://i.bosscdn.com/blog/20/16/09/2313274548568.jpg)
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