Maximum allowable temperature, 74 °C Tmax Drying time(sunshine hours) td 10 hours (average for april) Incident solar radiation, I 20 MJ/m2/day (average for past 30 years) Collector efficiency, 35% (Ampratwum, 1998). ή Wind speed 1.5 m/s Thickness of sliced mango 3 mm TABLE 3.2 VALUES OF DESIGN PARAMETERS PARAMETER VALUE DATE OF EQUATION USED initial humidity ratio, wi 0.0018 KG H2O/kg dry air Tam, RHam Initial enthalpy, hi 29.76 kJ/kg dry air Tam, RHam Equilibrium 34.37% Mf and isotherms relativehumidty, RHf equation (2) Final enthalpy, Hf 78.18 KJ/kg dry air Wi and Tf Final humisity ratio, wf 0.014 kgH2O/kg dry air RHF and hf Mass of water to be 0.79 kg of air/hr Equation (1) evaporated, mw Average drying rate, mdr 0.079kgH2O/he Equation (8) Air flow rate, ma 6.475 kg dry air.hr Equation (9) Volumetric airflow rate, 5.396 m3/hr Ma, air density (ρ) Va Total useful energy, E 3.1349 MJ Equation (6) Solar collector are, AC 0.45 m2 Equation (11)
Maximum allowable temperature, Tmax 74 °C Drying time(sunshine hours) td 10 hours (average for april) Incident solar radiation, I 20 MJ/m2/day (average for past 30 years) Collector efficiency, ή 35% (Ampratwum, 1998). Wind speed 1.5 m/s Thickness of sliced mango 3 mm TABLE 3.2 VALUES OF DESIGN PARAMETERS PARAMETER USED VALUE DATE OF EQUATION initial humidity ratio, wi 0.0018 KG H2O/kg dry air Tam, RHam Initial enthalpy, hi 29.76 kJ/kg dry air Tam, RHam Equilibrium relativehumidty, RHf 34.37% Mf and isotherms equation (2) Final enthalpy, Hf 78.18 KJ/kg dry air Wi and Tf Final humisity ratio, wf 0.014 kgH2O/kg dry air RHF and hf Mass of water to be evaporated, mw 0.79 kg of air/hr Equation (1) Average drying rate, mdr 0.079kgH2O/he Equation (8) Air flow rate, ma 6.475 kg dry air.hr Equation (9) Volumetric airflow rate, Va 5.396 m3/hr Ma, air density (ρ) Total useful energy, E 3.1349 MJ Equation (6) Solar collector are, AC 0.45 m2 Equation (11)
SOLAR%20DRYER%20PROJECT.docx