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this is for mechanical engineer (energy management )


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Question 2 — Solving Problems (15 Points) Problem 1 Air is at dry bulb temperature1 of 34° C and RH1 of 55%, is being cooled in a Cooling and
Dehumidification coil, the air leaves the coil at temperaturez 16 ° C. Air is used to cool lumber of size
12m3 at a drying rate of8 kg/hr. l. (4pt) Obtain the most accurate values for the following parameters using the attached
Psychometric chart: (Show your work clearly on the attached chart!) 2. (4pt) Calculate the volume flow rate (dry air), required by the process 3. (4pt) Calculate the required amount of kW by the process 4. (3pt) Calculate the amount of heat transfer due to sensible cooling phase only Page 3/4
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Carrier
120
125
130
135
145
35
45
55
Page 4/4
-0.032
PSYCHROMETRIC CHART
0.031
004
0.030
NORMAL TEMPERATURES
0.029
0.028
SI METRIC UNITS
Barometric Pressure 101.325 kPa
-0.45
SEA LEVEL
Reproduced by permission of Carrier Corporation.
08
-0.50
0.55
-0.68
09
Enthalpy At Saturation kJ/kg Dry Air
0.65
59
0.70
50
45
2 0.
E. 1.00
15
u Bulb or Saturation Temperate C
Moisture Content kg/kg Dry Air
0.75
0.80
Dry Bulb Temperature "C
0.85
0.90
Below 0"C Properties and Enthalpy Deviation Lines Are For Ice
Volume m3/kg Dry Air
Copyright @Carrier Corporation 1975
Cat. No. 794-002 Printed in U.S.A.

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