Equal volumes of two humid air streams, one at 90 F and 30 % relative humidity and the other at 30 F and 80 % relative humidity, are mixed adiabatically. What are the temperature and relative humidity of the product? Solution Read the following data from the psychrometric chart (Figure 8.4-2). T= 90 FT = 30 F hr = 30% hr = 80% 14.1 12.4 (ft3/lbm dry air) H (Btu/lbm dry air) 31.6 10.3 ha (Ibm H2O/Ibm dry air) 0.0089 0.00280 The mixing process is adiabatic and no water is added or removed