How does dilution ventilation help with heat stress?

How does dilution ventilation help with heat stress?

• A. Removes humidity
• B. Brings cool air in and reduces temperature in the work area
• C. Increases air speed without changing temperature
• D. Increases contaminants removal

Answer: (B)

Dilution ventilation helps with heat stress mainly by introducing cooler outdoor air into the space and increasing the exchange of indoor air with outside air. When the cooler air enters and mixes with warmer room air, the overall ambient temperature drops and heat is carried away more efficiently. This makes it easier for workers to dissipate heat through convection and evaporation, reducing the thermal strain. While dilution can also dilute humidity and contaminants, the primary benefit for heat stress is the cooling effect from bringing in cooler air.

Dilution ventilation helps with heat stress mainly by introducing cooler outdoor air into the space and increasing the exchange of indoor air with outside air. When the cooler air enters and mixes with warmer room air, the overall ambient temperature drops and heat is carried away more efficiently. This makes it easier for workers to dissipate heat through convection and evaporation, reducing the thermal strain. While dilution can also dilute humidity and contaminants, the primary benefit for heat stress is the cooling effect from bringing in cooler air.