At the Sochi Winter Olympic Games in 2014, the air at the skiing events was typi

Question

At the Sochi Winter Olympic Games in 2014, the air at the skiing events was typically 4°C with a relative humidity of 80%. Explain why the spectators did not sweat despite the high relative humidity. Include calculations to justify your explanation.

Inside an ice rink, the air conditioning must keep the air at a dry bulb temperature of 16°C and a relative humidity of 40% to ensure that the ice is maintained and there is no fogging. The ice rink at the Sochi Winter Olympic Games was located at the sea-level resort of Sochi. If the air-conditioning units operate on purely fresh air, calculate how much the wet-bulb temperature must be changed by and how much the absolute humidity must be changed by:

A - During the Winter Olympics, when the night-time temperature was 5°C and relative humidity was 70%.   

B - During the middle of summer, when the maximum temperature is 26°C and the relative humidity is 75%.                                       

Explanation / Answer

Conditions required for ice - rink

16 C DBT and 40% RH

from pychrometric chart we get

9.2 C wet bulb temperature and humidity ratio = 0.0045 kg/kg

A) During Winters at 5 DBT and 70% RH we have

     2.85 C wet bulb temperature and humidity ratio = 0.00377 kg/kg

     Change required = 2.85 - 9.2 = -6.35 C

B) During Summers at 26 DBT and 75% RH we have

     22.57 C wet bulb temperature and humidity ratio = 0.016 kg/kg

     Change required = 22.57 - 9.2 = 13.37 C

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.