The first and second law analyses of thermodynamic of pumpkin drying process

Abstract This paper is concerned with the thermodynamic analyses of single layer drying process of pumpkin slices via cyclone type dryer. Using the first law of thermodynamics, energy analysis was performed to estimate the ratios of energy utilization. However, exergy analysis was accomplished to determine the location, type, and magnitude of exergy losses during drying process by applying the second law of thermodynamics. It was concluded that the exergy losses went up with the increase of the energy utilization in both trays and drying chamber. The most exergy losses took place during the drying of pumpkin slices on the first tray. It is emphasized that pumpkin slices are sufficiently dried in the ranges between 60 and 80 °C and 20% and 10% of relative humidity at 1 and 1.5 m s −1 of drying air velocity during 5.66–12 h despite the exergy losses of 0–1.165 kJ s −1 .

[1]  E. Akpinar,et al.  Thin layer drying of red pepper , 2003 .

[2]  Ebru Kavak Akpinar,et al.  Energy and exergy analyses of drying of red pepper slices in a convective type dryer , 2004 .

[3]  Radivoje M. Topić,et al.  Mathematical Model for Exergy Analysis for Drying Plants , 1995 .

[4]  Feridun Hamdullahpur,et al.  EXERGY ANALYSIS OF FLUIDIZED BED DRYING OF MOIST PARTICLES , 2002 .

[5]  A. Bejan.  Advanced Engineering Thermodynamics , 1988 .

[6]  Can Ertekin,et al.  Drying of eggplant and selection of a suitable thin layer drying model , 2004 .

[7]  Dursun Pehlivan,et al.  Modelling of drying kinetics of single apricot , 2003 .

[8]  Feridun Hamdullahpur,et al.  Thermodynamic modeling of fluidized bed drying of moist particles , 2003 .

[9]  Ibrahim Dincer,et al.  Thermodynamics, Exergy and Environmental Impact , 2000 .

[10]  Mehmet Pala,et al.  The thin-layer drying characteristics of corn , 2003 .

[11]  Adnan Midilli,et al.  Thermodynamic analysis of the apple drying process , 2005 .

[12]  A. Midilli,et al.  A NEW MODEL FOR SINGLE-LAYER DRYING , 2002 .

[13]  Adnan Midilli,et al.  MODELING and EXPERIMENTAL STUDY ON DRYING of APPLE SLICES IN A CONVECTIVE CYCLONE DRYER , 2003 .

[14]  A. Midilli.  Determination of pistachio drying behaviour and conditions in a solar drying system , 2001 .

[15]  Ibrahim Dincer,et al.  Energy, Entropy and Exergy Concepts and Their Roles in Thermal Engineering , 2001, Entropy.

[16]  T. Ayhan,et al.  Drying and conservation conditions of pollen , 2000 .

[17]  A. Midilli,et al.  Energy and exergy analyses of solar drying process of pistachio , 2003 .

[18]  Adnan Midilli,et al.  Energy and exergy analyses of sugar production stages , 2003 .

[19]  İbrahim Doymaz,et al.  Convective air drying characteristics of thin layer carrots , 2004 .

[20]  I. Dincer,et al.  Development of a new Bi–Di correlation for solids drying , 2002 .

[21]  Adnan Midilli,et al.  Single layer drying behaviour of potato slices in a convective cyclone dryer and mathematical modeling , 2003 .

[22]  Feridun Hamdullahpur,et al.  Thermal analysis in fluidized bed drying of moist particles , 2002 .

[23]  Y. Çengel,et al.  Thermodynamics : An Engineering Approach , 1989 .

[24]  I. Dincer,et al.  Development of a new moisture transfer (Bi–Re) correlation for food drying applications , 2002 .

[25]  Ibrahim Dincer,et al.  A new model for thermodynamic analysis of a drying process , 2004 .

[26]  Ibrahim Dincer,et al.  On energetic, exergetic and environmental aspects of drying systems , 2002 .

[27]  Feridun Hamdullahpur,et al.  Energy analysis in fluidized-bed drying of large wet particles , 2002 .

[28]  A. Midilli,et al.  Mathematical modeling of thin layer drying of pistachio by using solar energy , 2003 .

[29]  Jan Szargut,et al.  Exergy Analysis of Thermal, Chemical, and Metallurgical Processes , 1988 .

[30]  Cigdem Tiris,et al.  Energy efficiency of a solar drying system , 1996 .

[31]  J. E. Ahern,et al.  The exergy method of energy systems analysis , 1980 .

[32]  E. Akpinar,et al.  Experimental investigation of drying behaviour and conditions of pumpkin slices via a cyclone-type dryer , 2003 .