An incoming air flow of 200 m3/h at a temperature of 20°C and a humidity ratio of 0.012 kgv/kga is...

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An incoming air flow of 200 m3/h at a temperature of 20°C and a humidity ratio of 0.012 kgv/kga is mixed in a chamber with another incoming air flow of 500 m3/h at a temperature of 15°C and a humidity ratio of 0.008 kgv/kga.  Based on the corresponding mass flow rates (and NOT the original volumetric flow rates) determine:   a)  The mass flow rate of the mixed air (i.e., the combination of the two flows) leaving the chamber in kg/s.  b) The temperature of the mixed air leaving the chamber. You may solve this with the aid of a psychrometric chart (recommended) or with the aid of a psychrometric calculator. If you use a chart, submit it with your solution.  Hint: for part (a) you will first need to find the density or specific volume for each state (density = 1/specific volume)

David · Accepted Answer

Ans. 1 
The volume flow rate of the air, 
3200 m /h 
The temperature of, 
020 C  
Humidity ratio, 
0.012 kgv/kga  
The second flow, 
3500 m /h , 015 C , 0.008 kgv/kga  
Calculate the mass flow rate of the air separately, 
Using the chart for density of air at 020 C , 
 
Now calculate the mass flow rate, 
1
1
200
1.204 0.

An incoming air flow of 200 m 3 /h at a temperature of 20°C and a humidity ratio of 0.012 kgv/kga is mixed in a chamber with another incoming air flow of 500 m 3 /h at a temperature of 15°C and a...

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