Working environment 1 Influence of microclimate on the

Working environment 1) Influence of microclimate on the body and their rationing; 2) protection from harmful substances in working area; 3) ventilation systems and their application.

Forming of heat At rest • 4 – 6 kj/min At heavy • 33 - 42 kj/min work

Heat transfer Normal microclimate condition (20 °C) 20 – 25% Evaporation 45% Radiation Heat transfer 25 – 30 %

Indicators at deviation of microclimate At evaporation of 1 g water In normal condition in day by sweat • 2. 5 kjoule • 0. 6 gramm of liquid At temperature • 10 -12 30 °C liters

Indicators of normal microclimate Relative hamidity Movement of air • 40 – 60% • 0. 1– 0. 3 m/sec

Classes of danger substances First class Second class Ext. dangerous ≤ 0. 1 mg/m³ High degree From 0. 1 to 1 mg/ m³ Third class Forth class Low dangerous Few dangerous From 1 to 10 mg/m³ More 10 mg/m³

MPC of some substances Code 0330 Sulfur dioxide 3 0. 5 0333 Hydrogen sulfide 2 0. 008 - 0334 Carbon bisulphate 2 0. 03 0. 003 0301 Nitrogen dioxide 2 0. 085 0. 04 0328 Carbon black 3 0. 15 0. 05 Contaminant substances Class of danger MPC, mg/m 3 Max of Averag one-off e daily 0. 05

Measures on redusing of harmful substances Changing of harmful substances by less Harmful substances Rationalization of tech – nological processes Mechanisation and automatisation Decreacing of harmful substances System of ventilation Moisturaturization of equipment Personal protection means

Ventilation Aeration ventilation Mechanical ventilation Organised Air intake Unorganised Exhaust

Mechanical ventilation