HEAT PUMP DRYING: RECENT DEVELOPMENTS AND FUTURE TRENDS

ABSTRACT This review paper focuses on the recent progress made in heat pump drying (HPD). An introduction is given on the operating and working principle of the heat pump drying system. Advantages and limitations of HPD are outlined. Two industrial applications of HPD, food and timber, are discussed. New developments in HPD are presented. A section discussing the potential of incorporating advanced heat pump cycles for drying application is also presented. Some possible new hybrid HPD technologies, e.g., radio frequency and infrared assisted HPD are discussed in terms of their industrial potential. Opportunities for further R&D to achieve better product quality and energy efficiency are identified. A new heat pump dryer design is also described to demonstrate the new trend in versatile heat pump design.

[1]  Christopher G. J. Baker,et al.  Industrial Drying of Foods , 1997 .

[2]  Siaw Kiang Chou,et al.  The contact factor for dryer performance and design , 1999 .

[3]  Siaw Kiang Chou,et al.  CONVECTIVE DRYING OF BANANA, GUAVA AND POTATO PIECES : EFFECT OF CYCLICAL VARIATIONS OF AIR TEMPERATURE ON DRYING KINETICS AND COLOR CHANGE , 2000 .

[4]  C. Strumiłło,et al.  Optimization of Heat Pump Dehumidifier , 1985 .

[5]  S. Devahastin,et al.  BATCH DRYING OF GRAINS IN AWELL-MIXED DRYER-EFFECT OF CONTINUOUS AND STEPWISE CHANGE IN DRYING AIR TEMPERATURE , 1999 .

[6]  Ian Turner,et al.  COMBINED MICROWAVE AND CONVECTIVE DRYING OF A POROUS MATERIAL , 1991 .

[7]  Bertalan Galambosi,et al.  INFRARED DRYING OF HERBS , 1999 .

[8]  A. C. Metaxas,et al.  Industrial Microwave Heating , 1988 .

[9]  Geoffrey Brundrett.  Handbook of Dehumidification Technology , 1987 .

[10]  Peter Jolly,et al.  Study of Heat Pump Assisted Microwave Drying , 1993 .

[11]  J. MacArthur.  Transient heat pump behaviour: a theoretical investigation , 1984 .

[12]  B. Geeraert,et al.  Air Drying by Heat Pumps with Special Reference to Timber Drying , 1976 .

[13]  A. C. Metaxas,et al.  MODELING OF THE RADIO FREQUENCY ELECTRIC FIELD STRENGTH DEVELOPED DURING THE RF ASSISTED HEAT PUMP DRYING OF PARTICULATES , 1998 .

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

[15]  Bertalan Galambosi,et al.  Infrared drying of herbs (Research Note) , 1999 .

[16]  V. Rich.  Personal communication , 1989, Nature.

[17]  Gumpon Prateepchaikul,et al.  HEAT PUMP DRYER PART 2: RESULTS OF THE SIMULATION , 1997 .

[18]  S. Prasertsan,et al.  HEAT PUMP DRYERS: RESEARCH AND DEVELOPMENT NEEDS AND OPPORTUNITIES , 1998 .

[19]  Josua P. Meyer,et al.  The drying of grain with heat pumps in South Africa: A techno‐economic analysis , 1992 .

[20]  Bertalan Galambosi,et al.  Infrared drying of herb , 1999 .

[21]  Siaw Kiang Chou,et al.  IDENTIFICATION OF THE RECEDING EVAPORATION FRONT IN CONVECTIVE FOOD DRYING , 1997 .

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