STUDY OF SOLAR FOOD DRYER

Abul Lais NalbandMIS NO:121425007

SOLAR RADIATION

Electromagnetic waves

1.8 X 1017 W

Reduction

ADVANTAGES

APPLICATIONS

WHY SOLAR DRYING

Introduction

• Drying• Various Methods• Process• Advantages Of Solar

CLASSIFICATION

• Operation Temperature High Temperature Low Temperature

• Heating Source Conventional Type Solar Type

CONTINUED…

CONTINUED…

COMPARISON OF OPEN-SUN DRYING AND CABINET DRYING

Drying RateUniformityTime PeriodEncroachment

ADVANTAGES OF DRIED FOOD

Shelf lifeProcessing Convenience

MOISTURE CONTENT

ENERGY BALANCE

CASE STUDY

Specimen GREEN PEAS

AssumptionInitial moisture content of 70% (wet basis) Ambient air has a temperature of 30°C and r.h. = 50%Final temperature of specimen is 36°CFinal temperature of air is 60°CMass =1Kg

APPROACHPsychrometric chartTemperature 30°C and humidity ratio 0.0135Temperature 36°C and humidity ratio 0.0240

corresponds to 65% rhSo rise in h ratio =0.0105Mass of water extracted =0.662 kgMass of air needed =0.662/.0105=63.06By using Ideal gas equation Volume of air required =55.97m3

APPROACH

AREA OF ABSORBER

DRYING PERIODS

REFERENCES

S. P. Sukhatme, “SOLAR ENERGY principles of thermal collection and storage”, Tata McGraw-Hill publication, second edition.

Solar radiation hand book 2008, solar energy centre, MNRE Indian metrological department.

V.K.Sharma, S.Sharma, H.P.Garge, “Mathematical modelling and experimental evolution of a natural convection type solar cabinet dryer”, Indian Institute of Technology, Delhi -110016, Energy convers.Mgmt. Vol.26.No.31, pp 65 -73 – 119, 1991.

V.K.Sharma, S.Sharma, R.A.Ray, H.P.Garge, “Design and performance studies of a solar dryer suitable for rural application centre of energy studies”, Indian Institute of Technology, Delhi -110016, Energy convers.Mgmt. Vol.26.No.1, pp 111 – 119, 1986.

O.V.Ekechukwu, B.Norton, “Review of solar-energy drying systems II: an overview of solar drying technology”, Energy Conversion & Management 40 (1999) 615 – 655.

A. Saleh, I. Badran, “Modelling and experimental studies on a domestic solar dryer”, Philadelphia University, Amman -19392, Jordan, Renewable Energy 34 (2009) 2239–2245.

P.Gbaha, H.Yobouet Andoh, J.Kouassi Saraka, B.Kamenan Koua, S.Toure, “Experimental investigation of a solar dryer with natural convective heat flow”, Renewable Energy 32 (2007) 1817–1829.