This indicates that after passage through the tunnel the ventilation air is received at 56 0 Fat the end of
December and the end of June, with a maximum of 60 F in early September and a minimum of 520 F in
early March. For the purpose of this problem the air maybe assumed to enter the space at the average 56 0 F
.
and 95 percent RH, or an enthalpy of 23.19 Btu per lb, which is cooler but more humid than the desired
room design conditions of 70 0F and 50 percent RH or an enthalpy of 25.49 Btu/lb. The resulting
ventilation air load is then
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