environmental hygiene

TASKS 37. Define air velocity and make a conclusion if cooling power of air in the word for prematures is 12 mcal/s. The temperature of the air has been determined - 24 oC. Use the formula for the air velocities less than 1 m/s. 38. Solve the problem. Calculate necessary ventilation volume for learning room in the Medical University, where present 7 persons. 39. Calculate actual volume of ventilation in treatment ward, where 4 patients. Present natural ventilation. The square of ventilation hole is 0,4 m2; the speed of air moving is 0,5 m/s; area of this room = 20 m2. Height of the room is 3,3m. 40. Spot the actual number of air change for classroom where present 8 students. The square of ventilation hole is 0,3 m2; the speed of air moving is 0,1 m/s; area of this room = 25 m2; height of room is 3,5 m. 41. There are 4 sources of illumination in the consulting room, the area of which is 16 square metres. Sources of illumination are 4 filament lamps, and the power of each lamp is 100 Wt. Calculate the illumance of this room and characterize it. Give the hygienic assessment. 42. Calculate light coefficient for the therapeutic ward, if it's width is 3 m, length is 6 m, and it has 1 window (height = 3,5 m, width = 1,5 m, area of the frame of the window is 15%). Make a conclusion