RT Journal Article
ID 03fb9b4945b88a34
A1 Sahdev, Ravinder Kumar
A1 Kumar, Mahesh
A1 Dhingra, Ashwani Kumar
T1 FORCED CONVECTION GREENHOUSE GROUNDNUT DRYING: AN EXPERIMENTAL STUDY
JF Heat Transfer Research
JO HTR
YR 2018
FD 2018-03-05
VO 49
IS 4
SP 309
OP 325
K1 groundnut/peanut
K1 convective heat transfer coefficient
K1 evaporative heat transfer coefficient
K1 forced convection
K1 greenhouse drying
AB In this study, the convective and evaporative heat transfer coefficients of groundnut were evaluated in a forced convection greenhouse drying (FCGHD) mode. The groundnuts were dried in the roof-type even span greenhouse with a floor area of 1.20 × 0.8 m2 in a forced mode in the climatic conditions of Rohtak, India (28°54'0"N 76°34'0"E). Three different wire
mesh trays of 0.15 × 0.25 m2 (Sample 1), 0.25 × 0.40 m2 (Sample 2), and 0.35 × 0.60 m2 (Sample 3) sizes were used to accommodate
a thin layer of groundnuts. Groundnuts were dried in the FCGHD mode till an optimum safe moisture storage
level of 8−10% was reached. The hourly experimental data were used to determine the values of experimental constants C and n in the Nusselt number expression by simple linear regression analysis and, consequently, the convective heat transfer coefficients (CHTC) were calculated. The value of CHTC was found to decrease with increase in the tray size. The average
value of the greenhouse efficiency was found to be 38.56%, 26.95%, and 31.99% for drying groundnut Samples 1, 2, and 3, respectively. The energy and exergy efficiencies were also evaluated and their values were observed to be 54.45%, 77.92%, and 65% and 2.57%, 1.01%, and 0.95% for drying groundnut Samples 1, 2, and 3 in the FCGHD mode, respectively. The experimental errors in terms of percent uncertainty were also evaluated. They were found to vary from 19.62% to 64.10%. The error bars for CHTC and evaporative heat transfer coefficient (EHTC) are also shown for groundnut drying under FCGHD conditions.
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