Question

Why people always sweat in summer but not in winter even winter has higher relative humidity. Using the Psychometric Chart below to support your answer (8%)

HH 2 2 . Boty rate water dry

Answer 1

In winters when air is at low dry bulb tempertaure and higher relative humidity the wet bulb temperature of air is very much close to dry bulb temperature resulting in little amount of water evaporation into air to make it saturated hence body secreates less water to saturate air hence we dont feel sweat. But in winter when temperature is high and relative humidity is low the wet bulb temperature is significantly lower than dry bulb hence large amount of water is reuqired to saturate air hence more sweat comes out of body to saturate air in summer This is reason why people sweat more in summer

0.030 0.029 0.028 0.027 0.026 0.025 0.024 0.023 0.022 0.021 20.020 0.019 0.018 0.017 60 Enthalpy At Saturation, kl/kg Dry Air 45 50 55 60 65 70 75 80 85 90 95 100 19 0.95 0.016 08 91 03 OS 3 20 07 ST Temperature, 10 0.015 0.014 0.013 0.012 0.011 0.010 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 A 0.001 +0.00 55 10% Moisture Content, kg/kg Dry Air O Wet Bulb or Saturation 10.4 COTE -10 01 15 20 25 30 35 40 45 50