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Category > Applied Sciences Posted 06 May 2017 My Price 8.00

shows two options for conditioning atmospheric air

12.98    Figure P12.98 shows two options for conditioning atmospheric air at steady state. In each case, air enters at

 

ma1

#     5

ma2

v3 2 v2

5

v1 2 v3

1ha3 1 v3hg32 2 1ha2 1 v2hg22

1ha1 1 v1hg12 2 1ha3 1 v3hg32

158C, 1 atm, and 20% relative humidity with a volumetric flow rate of 150 m3/min and exits at 308C, 1 atm, and 40%

 

 

 

 

 

 

Air

T1 = 15°C = 288 K

p1 = 1 atm

f1 = 20%

(AV)1  = 150 m3/min

Saturated water vapor at 1 atm

3

 

 

1                                                                    2

 

 

 

 

T2 = 30°C

p2 = 1 atm

f2 = 40%

 

 

 

 

Option A

 

 

 

 

 

 

Air

T1 = 15°C = 288 K

p1 = 1 atm

f1 = 20%

(AV)1  = 150 m3/min

Liquid water at 20°C

3

 

 

1                                                                    2

 

 

 

 

T2 = 30°C

p2 = 1 atm

f2 = 40%

 

 

 

 

Option B

 

+          –

Electric resistor

 

Fig. P12.98

 

 

relative humidity. One method conditions the air by injecting saturated water vapor at 1 atm. The other method allows the entering air to pass through a soaked pad replenished by liquid water entering at 208C. The moist air stream is then heated by an electric resistor. For T0 5 288 K, which of the two options is preferable from the standpoint of having less exergy destruction? Discuss.

 

Answers

IT KING
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Status NEW Posted 06 May 2017 11:05 AM My Price 8.00

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