Air pollution in industrial enterprises
In the same room temperature gradient is different for different points of the room. The values of A used by the calculations should be regarded as some average value.
Value / P.3 accepted the norms of meteorological conditions for industrial premises, described in SI 245-63. Supply air temperature in each particular case is chosen by the designer, since the exact specifications for it does not. Typically, supply air temperature is taken depending on the temperature of the working area. When dealing with heat is always less than 1P tp.a:
For fresh air introduced into the working area, with the aeration device, take A / = 5-f-8 В° C for the transition and A = 8 В° C - for the winter.
In mechanical flow fed into the work zone, we recommend the following quantities At, В° C:
feeding scattered inflow with low velocities:
away from jobs ....... 7-10
near jobs ........... 5-7
feeding scattered with significant inflow velocities (0,7-1,2 m / s CCK):
away from jobs ....... 6-Y
near jobs ........... 4-6
when the jet flow ............ 10-12
Supply air temperature is not recommended below +14 В° C for light work and +8 В° C - with a heavy.
When injection of air into the upper zone temperature can be taken much lower than this, depending on the height and the method feeder. The value of A can reach 15 - 20 В° C.