Investigation of drying kinetics of tomato slices dried by using a closed loop heat pump dryer

In this study, tomato slices were dried at three different drying air temperatures (35, 40 and 45 °C) and at 1 m/s air velocities by using a closed loop heat pump dryer (HPD). To explain the drying characteristics of tomato slices, ten thin-layer drying models were applied. The drying of tomato slices at each temperature occurred in falling-rate period; no constant-rate period of drying was observed. The drying rate was significantly influenced by drying temperature. The effective moisture diffusivity varied between 8.28 × 10−11 and 1.41 × 10−10 m2/s, the activation energy was found to be 43.12 kJ/mol. Besides, at the end of drying process, the highest mean specific moisture extraction ratio and coefficient of performance of HPD system were obtained as 0.324 kg/kWh and 2.71, respectively, at the highest drying air temperature (45 °C).

[1]  Z. Maroulis,et al.  Moisture Diffusivity Data Compilation in Foodstuffs , 1996 .

[2]  Md. Khalid Khan,et al.  Heat Pump Drying of Green Sweet Pepper , 2008 .

[3]  Phani Adapa,et al.  Re‐circulating heat pump assisted continuous bed drying and energy analysis , 2005 .

[4]  Mortaza Aghbashlo,et al.  Mathematical modelling of thin-layer drying of carrot. , 2009 .

[5]  Somchart Soponronnarit,et al.  MATHEMATICAL MODEL DEVELOPMENT AND SIMULATION OF HEAT PUMP FRUIT DRYER , 2000 .

[6]  Arif Hepbasli,et al.  A review of heat pump drying: Part 1 - Systems, models and studies , 2009 .

[7]  K. Saçılık,et al.  Mathematical modelling of solar tunnel drying of thin layer organic tomato , 2006 .

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

[9]  Mohammad Nurul Alam Hawlader,et al.  Properties of modified atmosphere heat pump dried foods , 2006 .

[10]  İlhan Ceylan,et al.  Determination of drying characteristics of apples in a heat pump and solar dryer , 2009 .

[11]  Somchart Soponronnarit,et al.  Fruit Drying Using Heat Pump , 2007 .

[12]  Wei Juan,et al.  Performance Analysis of Heat-pump Dryer to Dry Mushroom , 2013 .

[13]  B. Ghobadian,et al.  Mathematical modelling of thin layer hot air drying of apricot with combined heat and power dryer , 2015, Journal of Food Science and Technology.

[14]  J. C. Ho,et al.  Batch drying of banana pieces - effect of stepwise change in drying air temperature on drying kinetics and product colour , 2001 .

[15]  I. Doymaz,et al.  Air-drying characteristics of tomatoes , 2007 .

[16]  K. Falade,et al.  Modeling of Drying Patterns of Fresh and Osmotically Pretreated Cooking Banana and Plantain Slices , 2014 .

[17]  S. Prasertsan,et al.  Heat pump drying of agricultural materials , 1998 .

[18]  S. Soponronnarit,et al.  Modeling of combined far-infrared radiation and air drying of a ring shaped-pineapple with/without shrinkage , 2012 .

[19]  ing. Ingvald Str⊘mmen,et al.  NEW APPLICATIONS OF HEAT PUMPS IN DRYING PROCESSES , 1994 .

[20]  Effect of osmotic dehydration on the freeze drying kinetics of apricots. , 2009 .

[21]  Shane Clements,et al.  Heat pump assisted continuous drying part 2: Simulation results , 1990 .

[22]  Ana Lúcia Gabas,et al.  Drying Kinetics of Tomato by Using Electric Resistance and Heat Pump Dryers , 2004 .

[23]  Sema Tosun.  Bazı tarımsal ürünler için ısı pompalı bir kurutucunun geliştirilmesi ve termodinamik analizi , 2009 .

[24]  U Teeboonma,et al.  Optimization of heat pump fruit dryers , 2003 .

[25]  Ilhan Ceylan,et al.  Energy Analysis of Pid Controlled Heat Pump Dryer , 2009 .

[26]  A. El-sebaii,et al.  Empirical correlations for drying kinetics of some fruits and vegetables , 2002 .

[27]  R. K. Goyal,et al.  Thin-layer Drying Behaviour of Organically Produced Tomato , 2007 .

[28]  Milio Alves-Filho,et al.  The Application of Heat Pump in Drying of Biomaterials , 1996 .

[29]  John Crank,et al.  The Mathematics Of Diffusion , 1956 .

[30]  L. Bennamoun,et al.  Convective drying of a single cherry tomato: Modeling and experimental study , 2015 .

[31]  C. Peri,et al.  Oxidative heat damage of tomato halves as affected by drying , 1998 .

[32]  Jianxue Liu,et al.  Drying and Quality Characteristics of Flos Lonicerae in Modified Atmosphere with Heat Pump System , 2014 .

[33]  A. Arabhosseini,et al.  Mathematical modeling of thin layer solar drying of tomato slices , 2013 .

[34]  Haile Ma,et al.  INFLUENCE OF COMBINED MICROWAVE‐VACUUM DRYING ON DRYING KINETICS AND QUALITY OF DRIED TOMATO SLICES , 2012 .

[35]  T. Aktas,et al.  INFLUENCE OF PRETREATMENTS AND DIFFERENT DRYING METHODS ON COLOR PARAMETERS AND LYCOPENE CONTENT OF DRIED TOMATO , 2011 .

[36]  C. Mahanta,et al.  Thin layer drying of tomato slices , 2013, Journal of Food Science and Technology.