Simulation-Dryerwithheatrecovery.xlsx

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Department
Mechanical and Materials Engineering Courses
Course
MECH 430
Professor
Steve Harrison
Semester
Fall

Description
Simulation Time Step Time Time Change Only Yellow Highlighted Areas Below [s] [min] Simulation 0 0 0 Time Step t 60 sec 1 60 1 2 120 2 Constants 3 180 3 Latent Heat of Vaporization hf,g 2421 kJ/kg 4 240 4 Specific Gas Constant of Air R 0.287 kJ/kg K 5 300 5 air Specific Gas Constant of Water Vapour Rvapour 0.4615 kJ/kg K 6 360 6 7 420 7 Dryer Constants and Initial Conditions 3 8 480 8 Volumetric Air Flowrate vair 2.14 m /min 9 540 9 Electric Heating Coil Power W dryer 4500 W 10 600 10 Dryer Drum Set-Point Temperature Tdryer 100 C 11 660 11 12 720 12 Mass Transfer Coeffienct kdryer 0.0184 m/s 13 780 13 Atmospheric Pressure( Assumed in Dryer Vents) P abs 101325 Pa 14 840 14 15 900 15 Effective Area of Textiles A 2.13 m 2 16 960 16 textile Temperature of Textiles Ttextile 50 C 17 1020 17 18 1080 18 Ambient Dryer Inlet Temperture (T ) 20 C 19 1140 19 in i Initial Dryer Inlet Relative Humidity (in i 30.0% 20 1200 20 21 1260 21 Intial Mass Fraction of Textiles and Water (x ) textiles i 0.7 kg/kg 22 1320 22 Mass of Dry Textiles 1 kg 23 1380 23 24 1440 24 Air Properties 25 1500 25 Density of Moist Air 1.05 kg/m3 26 1560 26 Specific Heat Capasity of Moist Air 1.075 kJ/kg K 27 1620 27 28 1680 28 Example Case Heat Recovery heat Exchanger with NO Condensation 29 1740 29 Assumed Heat Recovery (heat Exchanger Effectiveness) 0.6 30 1800 30 Electricity Cost [$/kWh] 0.15 31 1860 31 32 1920 32 33 1980 33 34 2040 34 35 2100 35 36 2160 36 37 2220 37 38 2280 38 39 2340 39 40 2400 40 Ambient Air Conditions>>> <<< Note The DRYER Calc's are Hidden Here DRYER CONDITIONS Inlet to Dryer Outlet from Dryer Inlet Relative Saturation Vapour Absolute Enthalpy of Temper- Humidity Pressure Pressure Humidity Moist Air Absolute ature Humidity Enthalpy [C] [%] [Pa] [Pa] [kg/kg/] [kJ/kg] [kg/kg] [kJ/kg] 0.01324 90.4 20 30.0% 2331 699.4 0.0043 21.5 29.8 12.7% 4179 530.7 0.0033 32.0 0.01232 87.5 29.4 13.1% 4098 535.3 0.0033 31.7 0.01235 87.5 29.5 13.1% 4100 535.2 0.0033 31.7 0.01235 87.5 29.5 13.1% 4100 535.2 0.0033 31.7 0.01235 87.5 29.5 13.1% 4100 535.2 0.0033 31.7 0.01235 87.5 29.5 13.1% 4100 535.2 0.0033 31.7 0.01235 87.5 29.5 13.1% 4100 535.2 0.0033 31.7 0.01235 87.5 29.5 13.1% 4100 535.2 0.0033 31.7 0.01235 87.5 29.5 13.1% 4100 535.2 0.0033 31.7 0.01235 87.5 29.5 13.1% 4101 535.2 0.0033 31.7 0.01235 87.5 29.5 13.0% 4101 535.1 0.0033 31.7 0.01235 87.5 29.5
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