Abstract
This review paper included the recent progress made in heat pump assisted drying, its principle, mechanism and efficiency, type and its application for drying of agricultural produce. Heat pump assisted drying provides a controllable drying environment (temperature and humidity) for better products quality at low energy consumption. It has remarkable future prospects and revolutionaries ability. The heat pump system consists of an expansion valve, two heat exchangers (evaporator and condenser), and a compressor, which are connected by using copper tubes. In this paper we also provided a review discussion on different type of heat pump assisted drying system ready for remarkable and commercial use in different type of food industries. Here we also have given some major advantage and disadvantage of heat pump assisted drying.
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References
Abou-Ziyan HZ, Ahmed MF, Metwally MN, Abd El-Hameed HM (1997) Solar-assisted R22 and R134a heat pump systems for low-temperature applications. Appl Therm Eng 17(5):455–469
Achariyaviriya S, Soponronnarit S, Terdyothin A (2000) Mathematical model development and simulation of heat pump fruit dryer. Drying Technol 18:479–491
Alves-Filho O (2002) Combined innovation heat pump drying technologies and new cold extrusion techniques for production of instant foods. Drying Technol, HPD special issue 20(8):1541–1557
Alves-Filho O, Eikevik TM (2009) Acceleration of heat pump atmospheric freeze drying of green peas by controlled fluidization and infrared radiation. Proceedings of the 4th Nordic Drying Conference, 17–19 Jun, Reykjavik, Iceland (CD-ROM)
Alves-Filho O, Strommen I (1996a) Application of heat pump in drying of biomaterials. Drying Technol 14:2061–2090
Alves-Filho O, Strommen I (1996b) Performance and improvements in heat pump dryers. In: Strumillo C, Pakowski Z (eds) Drying technol 96. Poland: Krakow, pp 405–415
Alves-Filho O, Strommen I (1996c) Performance and improvements in heat pump dryers. Drying 96—Proceedings of the 10th International Drying Symposium, Krakow, Poland, 30 July-2Aug, vol. A, pp 405–416
Alves-Filho O, Strommen I, Thorbergsen E (1997) Simulation model for heat pump dryer plants for fruits and roots. Drying Technol 15:1369–1398
Alves-Filho O, Thorbergsen, Strommen I (1998) A component model for simulation of multiple fluduzed bed heat pump dryers. Drying 98-Proceedings of the 11th International Drying Symposium (IDS 98), Halkidiki, Greece, August 19–22: 94–10
Alves-Filho O, Eikevik TM, Mulet A (2007) Kinetics and mass transfer during atmospheric freeze drying of red pepper. Drying Technol 25(7–8):1155–1161
Alves-Filho O, Eikevik TM, Goncharova-Alves SV (2008) Single-and multistage heat pump drying of protein. Drying Technol 26(4):470–475
Alves-Filho O, Eikevik TM, Walberg M, Fridberg C (2009) Energy and thermal efficiency analysis for combined spray drying and heat pump systems. Proceedings of the 4th Nordic Drying Conference, 17–19 Jun, Reykjavik, Iceland (CD-ROM)
Andres A, Bilbao C, Fito P (2004) Drying kinetics of apple cylinders under combined hot air microwave dehydration. J Food Eng 63:71–78
Anonymous (2009) Fruits and vegetables (accessed November 27). http://www.pfndai.com/Processed
Arabhosseini A, Padhye S, Huisman W, Van-Boxtel A, Müller J (2010) Effect of drying on the color of tarragon (Artemisia dracunculus L.) leaves. Food Bioprocess Technol. doi:10.1007/s11947-009-0305-9
Baines PG, Carrington CG (1988) Analysis of rankine cycle heat pump driers. Int J Energy Res 12(3):495–510
Baker GJ (1997) Industrial drying of foods, chap 4. Chapman and Hall, London, pp 65–89
Bantle M, Eikevik TM, Rustad T (2009) Atmospheric freeze-drying of calanus finmarchicus and its effects on proteolytic and lipolytic activities 4th Nordic Drying Conf, June 17–19, Reykjavik, Iceland
Best R, Soto W, Pilatowsky I, Gutierrez LJ (1994) Evaluation of a rice drying system using a solar assisted heat pump. Renewable Energy 5(1–4):465–468
Best R, Cruz JM, Gutierrez J, Soto W (1996) Experimental results of a solar assisted heat pump rice drying system. Renewable Energy 9(1–4):690–694
Bhartia P, Stuchly SS, Hamid MAK (1973) Experimental results for combinational microwave and hot air drying. J Microwave Power 8(3):245–252
Boonnattakorn R, Phoungchandang S, Leenanon B, Khajarern S, Khajarern J (2004) The comparative study of garlic powder processing by heated air and dehumidifier heat pump dryer. Food Constant J 34(3):248–260
Brodyansky VM, Sorin MV, Le Goff P (1994) The efficiency of industrial processes: exergy analysis and optimization. Elsier, Amsterdam, Book (ISBN 0444899960) B76
Brook RC (1986) Heat pumps for near-ambient grain drying: a performance and economics feasibility study. Agric Eng 41(2):52–57
Carrington CG, Baines PG (1988) Second law limits in convective heat pump driers. Int J Energy Res 12:481–494
Cartwright WG (1987) Computer modelling of an energy-efficient drying plant. 4th Asean Energy Conference - Energy Technology, pp. 268–279
Cengel YA, Boles MA (1998) Thermodynamics: an engineering approach, 3rd edn. McGraw-Hill, p 1056
Charters WWS, de Forest L, Dixon CWS, Taylor LE (1980) Design and performance of solar boosted heat pumps. In: Australian and New Zealand solar energy society annual conference, Melbourne
Chegini G, Khayaei J, Rostami HA, Sanjari AR (2007) Designing of a heat pump dryer for drying of plum. J Res Appli Agric Eng 52(2):63–65
Chen P, Pei DCT (1989) A mathematical model of drying processes. Int J Heat Mass Transfer 32(2):297–310
Chen HH, Huang TC, Tsai CH, Mujumdar AS (2008) Development and performance analysis of a new solar energy assisted photo catalytic dryer. Drying Technol 26:503–507
Chottanom P, Phoungchandang S (2005) The development of osmotically dehydrated mangoes using conventional drying and dehumidified drying. Chem Engi Trans 6:897–902
Chou SK, Chua KJ (2001) New hybrid drying technologies for heat sensitive foodstuffs. Trends Food Sci Technol 12:359–369
Chou SK, Hawlader MNA, Ho JC, Wijeysundera NE, Rajasekar S (1993) Heat pump in the drying of food products. Int J Energy Res 14:397–406
Chou SK, Hawlader MNA, Chua KJ, Teo CC (1997) A methodology for tunnel dryer chamber design. Int J Energy Res 21:395–410
Chou SK, Chua KJ, Hawlader MNA, Ho JC (1998) A two-stage heat pump dryer for better heat recovery and product quality. J Institute of Engineers, Singapore 38:8–14
Chou SK, Chua KJ, Mujumdar AS, Tan M, Tan SL (2001) Study on the osmotic pretreatment and infrared radiation on drying kinetics and colour changes during drying of agricultural products. ASEAN J Sci Technol Dev 18(1):11–23
Chua KJ, Mujumdar AS, Chou SK, Hawlader MNA, Ho JC (2000) Convective drying of banana, guava and potato pieces: effect of cyclical variations of air temperature on convective drying kinetics and colour change. Drying Technol 18(5):907–936
Chua KJ, Mujumdar AS, Hawlader MNA, Chou SK, Ho JC (2001) Batch Drying of Bannana Pieces-Effect of Stepwise Change in Drying Air Temperature on Drying Kinetics and Product Colour. Food Res Int 34:721–731
Chua KJ, Chou SK, Hawlader MNA, Ho JC, Mujumdar AS (2002a) On the study of time-varying temperature drying—effect on drying kinetics and product quality. Drying Technol 20(8):1579–1610
Chua KJ, Chou SK, Ho JC, Hawlader MNA (2002b) Heat pump drying: recent developments and future trends. Drying Technol-An Int J 1532–2300, 20(8): 1579–1610
Clark DE (1996) Microwave processing of materials. Annu Rev Mater Sci 26:299–331
Claussen IC, Andresen T, Eikevik TM, Strommen I (2007) Atmospheric freeze drying—modeling and simulation of a tunnel dryer. Drying Technol 25(12):1959–1965
Clements S, Ha X, Jolly P (1993) Experimental verification of a heat pump assisted continuous dryer simulation model. Int J Energy Res 17:19–28
Daghigh R, Ruslan MH, Alghoul1 MA, Zaharim A, Sopian K (2009) Design of nomogram to predict performance of heat pump dryer. Proceedings of the 3rd WSEAS Int. Conf. on Renewable Energy Sources, La Laguna, Tenerife, Canary Islands, Spain, July 1–3, pp 277–282
Dincer I, Cengel (2001) Energy, entropy and exergy concepts and their roles in thermal engineering. Entropy 3:116–149
Donsi G, Ferrari G, Di MP (2001) Utilization of combined processes in freeze-drying of shrimps. Food Bioprod Process: Transactions of the Institution of Chemical Engineers, Part C 79(3):152–159
FAS Online (2009) World raisin situation and outlook. http://gain.fas.usda.gov//Raisin%20Annual_BuenosArgentina_7-16-2010.pdf
Fatouh M, Metwally MN, Helali AB, Shedid MH (2006) Herbs drying using a heat pump dryer. Energy Convers Manage 47(15–16):2629–2643
Feng X, Zhu XX, Zheng JP (1996) A practical exergy method for system analysis. Proceeding of the 31st Intersociety Energy Conversion Engineering Conference, IECEC 96, 11–16 Aug, Washington DC, pp 2068–2071
Feng H, Tang J, Cavalieri RP, Lumb OA (2001) Heat and mass transport in microwave drying of hygroscopic porous materials in a spouted bed. AIChE J 74(7):1499–1511
Flikke AM, Cloud HA, Hustrulid (1957) Grain drying by heat pump. Agric Eng 38(8):592–597
Fritz VA, Cloud HA, Deef RF, Borowski AM (1990) A versatile heat pump seed dryer. Hortic Sci 25(8):977–978
Funebo T, Ohlsson T (1998) Microwave-assisted air dehydration of apple and mushroom. J Food Eng 38:353–367
Gac A, Vrinat G, Blaise JC, Camous JP, Fleury M (1988) Guide for the design and operation of average and large capacity electric heat pumps. Int Inst Refrig, Paris, p 152
Gunasekaran S (1999) Pulsed microwave-vacuum drying of food materials. Drying Technol 17(3):395–412
Hawlader MNA, Bong TY, Yang Y (1998) A simulation and performance analysis of a heat pump batch dryer. In: Mujumdar AS, Series editor. Proc of the 11th Int Drying Symp, Halkidiki, Greece, August 19–22, pp 208–215
Hawlader MNA, Chou SK, Jahangeer KA, Rahman SMA, Lau KWE (2003) Solar-assisted heat-pump dryer and water heater. Appli Energy 7(1): 185–193(9)
Hawlader MNA, Perera CO, Tian M (2006) Properties of modified atmosphere heat pump dried foods. Food Eng 74:392–401
Haywood RW (1974a) A critical review of theorems of thermodynamic availability with concise formulations Part 1: availability. I Mech Eng Sci 16(2):160–173
Haywood RW (1974b) A critical review of theorems of thermodynamic availability with concise formulations Part 2: irreversibility. I Mech Eng Sci 16(2):160–173
Heap RD (1979) Heat pumps. In: E and F. N. Spon, London, p1–2.
Hesse B (1995) Energy efficient electric drying systems for industry. Drying Technol 13(1):1543–1562
Hogan MR, Ayers DL, Muller RE Jr, Foster GH, Rall EC, Doering OC (1983) Heat pump for low-temperature grain drying. Trans ASAE 26(4):1234–1238
Islam MR, Mujumdar AS (2004) In: Mujumdar AS (ed) Heat pump assisted drying- in guide to industrial drying. Colour, Mumbai, pp 187–210
Jangam SV, Joshi VS, Mujumdar AS, Thorat BN (2008) Studies on dehydration of sapota (Achras zapota). Drying Technol 26:369–377
Japan Statistics Bureau (2000) Japan statistical year book. Government of Japan: Management and Coordination Agency
Jia X, Jolly P, Clemets S (1990) Heat pump assisted continuous drying part 2: simulation results. Int J Energy Res 14:771–782
Jia X, Clements S, Jolly P (1993) Study of heat pump assisted microwave drying. Drying Technol 11(7):1583–1616
Jia LW, Islam MR, Mujumdar AS (2003) A simulation study on convection and microwave drying of different food products. Drying Technol 21(8):1549–1574
Jolly P, Jia X, Clements S (1990) Heat pump assisted continuous drying part I: a simulation model. Int J Energy Res 14(7):757–770
Jones P (1992) Electromagnetic wave energy in drying processes. In: Mujumdar AS (ed) Drying 92. Elsevier Science Publisher BV, pp 114–136
Jorgensen SE (2001) The thermodynamic concept: exergy. In: Jorgensen SE (ed) Thermodynamics and ecological modelling. Lewis, Boca Raton, pp 153–163
Kato K (1985) Exergy evaluation in grain drying. In: Mujumdar AS (ed) Drying 85. Hemisphere Publishing Co., p 420–427
Keeye RB (1978) Introduction to industrial drying operations. Pergamon, New York
Klocker K, Schmidt EL, Steimle F (2002) A drying heat pump using carbon dioxide as working fluid. Drying Technol, HPD special issue 20(8):1659–1671
Kohayakawa MN, Silveria-Junior V, Telis-Romero J, (2004) Drying of mango slices using heat pump dryer. Paper presented at the Proceedings of the 14th Int Drying Symp, Sao Paulo, Brazil, 22–25 August
Kudra T, Mujumdar AS (2001) Advanced drying technologies. Marcel Dekker, New York, p 457
Kudra T, Mujumdar AS (2002) Advanced drying technologies- book, Radio frequency assisted heat pump drying-chapter 31: 407–408
Law C, Mujumdar AS (2007) Fluidized bed dryers. Handbook of industrial drying, 3rd edn, chapter 8, pp 174–193
Lawand CL, Mjumdar AS (2007) Hand book of industrial drying, 3rd edn. CRC Press, p 192
Lawton J (1978) Drying: the role of heat pumps and electromagnetic fields. Phys Technol 9:p214–p220
Lazzarin R (1994) Heat pumps in industry—I. Equipment. Heat Recovery Syst CHP 14(6):581–597
Lazzarin R (1995) Heat pumps in industry—II. Applications. Heat Recovery Syst CHP 15(3):305–317
Lin TM, Durance TD, Scaman CH (1998) Characterization of vacuum microwave, air and freeze-dried carrot slices. Food Res Int 31:111–117
Liu L (2003) Entry into supermarket of agricultural products after entering WTO. Agric Prod Process 6(5):4–5
Lu A (2007) Heat pumps. Encyclopedia of energy engineering and technology - 3 volume set (print version). In: Barney L, Capehart (eds) CRC Press, p 814
Lu A, Charters WWS (2003) Electrical and engine driven heat pumps for effective utilisation of renewable energy resources. Appli Therm Eng 23(10):1295–1300
Lu A, Fuller RJ, Charters WWS (2005) Ambient energy fraction of a heat pump. renewable energy for a sustainable future—a challenge for a post carbon world ANZSES 2005, Reviewed as full paper, pp 1–7
Marshall MG, Metaxas AC (1998) Modeling the radio frequency electric field strength developed during the RF assisted heat pump drying of particulates. Int Microwave Power Inst 33:167–177
Marshall MG, Metaxas AC (1999) Radio frequency assisted heat pump drying of crushed brick. Appli Therm Eng 19(4):375–388
Maskan M (2001) Kinetics of colour change of kiwifruits during hot air and microwave drying. J Food Eng 48:169–175
Mason RL, Blarcom AV (1993) Drying macadamia nuts using a heat pump dehumidifier. In: Development and application of heat pump dryer, at Brisbane, Australia, pp 1–7
Mason RL, Britnell PM, Young GS, Birchall S, Fitzpayne S, Hesse BJ (1994) Development and application of heat-pump dryers to the Australian food industry. Food Aust 46(7):319–322
McCauley JF (1983) A simplification of the second law of thermodynamics. Energy Eng 80(3):51–65
McGovern JA (1990) Exergy analysis-a different perspective on energy Part 1: the concept of exergy. Proc Inst Mech Engineerrs Part A: J Power and Energy 204:253–268
Mc Mullen JT, Morgan R (1981) Heat pumps. Adam Hilger Ltd, Bristol
Meyer JP, Greyvenstein GP (1992) The drying of grain with heat pumps in South Africa: a techno-economic analysis. Int J Energy Res 16:13–20
Moran MJ, Sciubba E (1994) Exergy analysis: principles and practice. Trans ASME—J Eng Gas Turbine Power 116:285–290
Mujumdar AS (1991) Drying technologies of the future. Drying Technol 9:325–347
Mujumdar AS (2007) An overview of innovation in industrial drying: current status and R&D needs. Transp Porous Media 66:3–18
Mujumdar AS, Law CL (2010) Drying technology: trends and applications in postharvest processing. Food Bioprocess Technol 3:843–852
Mujumdar AS, Devahastin S, Ernest CKJ (2002) Mini-workshop on industrial drying. King Monkut’s University Technol Thonburi, Bangkok, p 217, April 22
Newbert GJ (1985) Energy efficient drying, evaporation and similar processes. J Heat Recovery Syst 5:551–559
Nijhuis HH, Torringa HM, Muresan S, Yuksel D, Leguijt C, Kloek W (1998) Approaches to improving the quality of dried fruit and vegetables. Trends Food Sci Technol 9:13–20
Ogura H, Ymamoto T, Kage H, Matsuno Y, Mujumdar AS (2002) Effects of heat exchange condition on hot air production by a chemical heat pump dryer using CaO/H2O/Ca(OH)2 reaction. Chem Eng J 86:3–10
Ogura H, Ishida H, Kage H, Mujumdar AS (2003) Enhancement of energy efficiency of a chemical heat pump-assisted convective dryer. Drying Technol 21:279–292
Ogura H, Yamamoto T, OtsuboY, Hiroki Ishida H, Kage H, Mujumdar AS (2004) Controllability of a chemical heat pump dryer. Drying 2004—Proc 14th Int Drying Sym, São Paulo, Brazil, 22–25 Aug vol B, pp 998–1004
Ogura H, Yamamoto T, Otsubo Y (2005) A control strategy for a chemical heat pump dryer. Drying Technol 23(6):1189–1203
Ogura H, Yasuda S, Otsubo Y, Mujumdar AS (2007) Continuous operation of a chemical heat pump. Asia-Pacific J Chem Engi, Special Issue: Thermal Dehydration II, 2(2):118–123
Okos MR, Narsimhan G, Singh RK, Weitnauer AC (1992) Food dehydration. In: Heldman DR, Lund DB (eds) Handbook of food engineering. Marcel Dekker, New York, pp 437–562
Oktay Z, Hepbasil A (2003) Performance evaluation of a heat pump assisted mechanical opener dryer. Energy Convers Manage 44:1193–1207
Oliver TN (1982) Process drying with a dehumidifying heat pump. Paper C2 presented at the Int Sym on the Industrial Application of Heat pumps, Coventry, England, 24–26 March, pp 73–88
O’Neill MB, Rahman MS, Perera CO, Smith B, Melton LD (1998) Colour and density of apple cubes dried in air and modified atmosphere. Int J Food Prop 1(3):197–205
Othman MY, Ruslan MH, Sopian K, Abdulmajid ZA (2008), Heat pump drying multifunctional solar thermal collector. World renewable energy congress, pp 1665–1670
O’Toole F, McGovern JA (1990) Some concepts and conceptual devices for exergy analysis. J Mech Engi Sci—Proc Inst Mech Eng 24:329–340
Paakkonen K, Havento J, Galambosi B, Pyykkonen M (1999) Infrared drying of herbs. Agric Food Sci Finl 8:19–27
Pal US, Khan MK (2008) Calculation steps for the design of different components of heat pump dryer under constant drying rate condition. Drying Technol 26(7):864–872
Pendyala VR, Devotta S, Patwardhan VS (1986) The economics of heat pump assisted drying systems. Heat Recovery Syst 6(6):443–442
Pendyala VR, Devotta S, Patwadhan VS (1990) Heat pump-assisted dryer Part 1: mathematical model. Int J Energy Res 14:479–492
Perera CO, Rahman MS (1997) Heat pump dehumidifier drying of food. Trends Food Sci Technol 8:75–79
Phaphuangwittayakul W, Terdtoon P, Chaitep S, Tantakom P, Vorayos N, Fulford D (2000) Loop thermosyphon as an energy saver in heat-pump type dryer. Proc 6th Int Heat Pipe Symp, Chiang Mai, Thailand, pp 192–201
Phaphuangwittayakul W, Terdtoon P, Khamonpet P, Vorayos N, Klongpanich W, Fulford D (2002) Effect of by-pass air ratio and recirculation air ratio on heat transfer characteristics of heat-pump type dryer with looped thermosyphon as an energy saver. Proc 12th Int Heat Pipe Conf, Moscow, Russia, pp 525–530
Phaphuangwittayakul W, Khamonpet P, Terdtoon P, Klongpanich W, Vorayos N, Raghavan GSV (2003) Heat transfer characteristics of loop thermosyphon applied heat pump dryer. Proc 7th Int Heat Pipe Sym, Jeju, Korea, pp 231–236
Phoungchandang S (2009) Simulation model for heat pump-assisted dehumidified air drying for some herbs. World J Agric Sci 5(2):138–142
Phoungchandang S, Sanchai P, Chanchotikul K (2003) The development of dehumidifying dryer for a Thai herb drying (Kaprao leaves). Food J 33(2):146–155
Prasertsan S, Saen-saby P (1998) Heat pump drying of agricultural materials. Drying Technol 16(1–2):235–250
Prasertsan SP, Saen-Saby S, Prateepchaikul G, Ngamsritrakul P (1996) Effects of product drying rate and ambient condition on the operating modes of heat pump dryer. Drying 96-Proc 10th Int. Drying Symp, Krakow, Poland, 30 July-2Aug, vol. A, pp 529–534
Prasertsan S, Sean-saby P, Prateepchaikul G (1997) Heat pump dryer. Part 3: experiment verification of the simulation. Int J Energy Res 21:1–20
Rahman SMA, Islam MR, Mujumdar AS (2007) A study of couple heat and mass transfer in composite food products during convective drying. Drying Technol 25(7–8):1359–1368
Reay DA (1979) Industrial energy conservation. 2nd edition, Pergamon Press. Endeavour 4(2):85
Reay DA, Macmichael DBA (1979) Heat pumps design and applications—a practical handbook for plant managers, engineers, architects and designers. Pergamon, Oxford
Reay DA, Macmichael DBA (1988) Heat pumps. Pergamon, Oxford, p 58
Rossi SJ, Neues C, Kicokbusch TG (1992) Thermodynamics and energetic evaluation of a heat pump applied to drying of vegetables. In: Mujumdar AS (ed) Drying’92. Elsevier Science, Amsterdam
Ruiz DG, Martınez-Monzo J, Fito P, Chiralt A (2003) Modelling of dehydrationerehydration of orange slices in combined microwave/air drying. Innov Food Sci Emerg Technol 4(2):203–209
Saensabai P, Prasertsan S (2007) Condenser coil optimization and component matching of heat pump dryer. Drying Technol 25(9):1571–1580
Schmidt EL, Klocker K, Flacke N, Steimle F (1998) Applying the trans critical CO2 process to a drying heat pump. Int J Refrig 21(3):202–211
Sokhansanj S (1984) Grain drying simulation with respect to energy conservation and grain quality. In: Mujumdar AS (ed) Advances in drying, Hemisphere Publishing Co., pp 121–180
Soma J (1983) Exergy and productivity. Energy Eng 80(2):9–18
Soponronnarit S, Taweerattanapanish A, Wetchacama S, Kongseri N, Wongpiyachon S (1998) Spin-off from paddy drying by fluidisation technique. Presented at the 7th Int Working Conf on Stored-Product Protection, Bei**g, China, 14–19th October
Sosle V, Raghavan GSV, Kittler R (2001) Experiences with a heat pump dehumidifier assisted drying system, Proc of the 1st Nordic Drying Conf, Trondheim, Norway, edited by Alves-Filho, Eikevik, and Strommen, 27–29 June, 29
Sporn P, Ambrose ER (1955) The heat pump and solar energy. Proc World Symp on Appl Solar Energy, Phoenix, Arizona, 1–5 Nov, pp 159–170
Strommen I (1986) Energy optimal temperature differences in heat pump driers. In: Mujumdar AS (ed) Drying of solid – recent international developments. Wiley, New York, pp 207–212
Strommen I, Jonassen O (1996) Performance tests of a new 2-stage counter-current heat pump fluidized bed dryer. In: Strumillo C, Pakowski Z (eds) Drying 96, pp 563–568)
Strommen I, Kramer K (1994) New applications of heat pumps in drying process. Drying Technol 12(4):889–901
Strommen I, Eikevik TM, Odilio A-F (1999) Optimum design and enhanced performance of heat pump dryer. In: Abudullah K, Tamaunan AH, Maujumdar AS (eds) Proc first Asian-Australian Drying Conference, at Bali, Indonesia, 68
Strommen I, Alves-Filho O, Eikevik TM, Claussen IC (2002) Physical properties in drying of food with combined sublimation and evaporation, 13th Int Drying Symp, Vol C, pp 698–1705
Strumillo C, Adamiec J (1996) Energy and quality aspects of food drying. Drying Technol 14(2):423–448
Sunthonvit N, Srzednicki G, Craske J (2007) Effects of drying treatments on the composition of volatile compounds in dried nectarines. Drying Technol 25:877–881
Tai KW, Zylla R, Devotta S, Diggory PJ, Watson FA, Holland FA (1982a) The potential for heat pumps in drying and dehumidification systems- II: an experimental assessment of the heat pump characteristics of a heat pump dehumidification system using R114. Int J Energy Res 6(4):323–331
Tai KW, Devotta S, Watson FA, Holland FA (1982b) The potential for heat pumps in drying and dehumidification systems- III: an experimental assessment of the heat pump characteristics of a heat pump dehumidification system using R114. Int J Energy Res 6(4):333–340
Teeboonma U, Tiansuwan J, Soponronnarit S (2003) Optimization of heat pump fruit dryers. J Food Eng 59:369–377
Thomas WJ (1996) RF drying provides process savings: new systems optimize radio frequency drying for the ceramic and glass fiber industries. Ceramic Industry Magazine pp 30–34
Topic R (1995) Mathematical model for exergy analysis of drying plants. Drying Technol 13(1 and 2):437–445
Tuley L (1996) Swell time for dehydrated vegetables. Int Food Ingred 4:23–27
Turner LW, Jolly P (1990) The effect of dielectric properties on drying kinetics. J Microw Power Electromagn Energy 25(4):212–223
Vázquez G, Chenlo F, Moreira R, Cruz E (1997) Grape drying in a pilot plant with a heat pump. Drying Technol 15(3 and 4):899–920
Wang S, Tang J, Johnson JA, Mitcham E, Hansen JD, Hallman G et al (2003) Dielectric properties of fruits and insect pests as related to radio frequency and microwave treatments. Biosyst Eng 85:201–212
Ying Y, Canren L (1993) The exergetic analysis of heat pump drying system. Proc 28th Inter Soci Energy Conversion Engi Conf, IECEC 93, 8–13 Aug, Atlanta GA, vol 1, pp 913–917
Yongsawatdigul J, Gunasekaran S (1996) Microwave-vacuum drying of cranberries. Part II: quality evaluation. J Food Procces Preserv 20:145–156
Zafri MAA, Othman MYH, Ruslan MH, Sopian K (2007) Development of a close loop solar collector. Regional Conference on Engineering Mathematics, Mechanics, Manufacturing and Architecture, Putrajaya, Malaysia, 27–28 November, pp 48–53
Zbicinski I, Jakobsen A, Driscoll JL (1992) Application of infrared radiation for drying of particulate material. In: Mujumdar AS (ed) Drying 92. Elsevier Sci Publisher BV, pp 704–711
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Patel, K.K., Kar, A. Heat pump assisted drying of agricultural produce—an overview. J Food Sci Technol 49, 142–160 (2012). https://doi.org/10.1007/s13197-011-0334-z
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DOI: https://doi.org/10.1007/s13197-011-0334-z