A review of heat pump drying: Part 1 – Systems, models and studies

Çolak, Neslihan; Hepbaşlı, Arif

doi:10.1016/j.enconman.2009.04.031

Cited by 113 publications

(38 citation statements)

References 49 publications

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“…Heat pump drying (HPD) is suitable for heat sensitive materials (such as fruits, vegetables and aquatic products) due to its ability to independently control the drying operation parameters. Other advantages of HPD over conventional convection drying include the energy saving potential, the wide range of drying conditions and being environmentally friendly . Drying efficiency and quality maintenance are the major concerns of both manufactures and consumers.…”

Section: Introductionmentioning

confidence: 99%

Effects of sodium alginate‐based coating pretreatment on drying characteristics and quality of heat pump dried scallop adductors

et al. 2019

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Background Drying efficiency and quality maintenance are the major concerns of both manufactures and consumers. Heat pump drying (HPD) is suitable for heat sensitive foodstuffs due to its ability to independently control the drying operation parameters. However, lower drying rate and energy efficiency in the later period of HPD are the bottlenecks that restrain its application. A novel approach using hydrocolloids as pretreatment coatings prior to drying was designed to solve these problems. The effects of sodium alginate (SA) coating, drying temperatures and air velocities on the drying characteristics and quality attributes of scallop adductors were evaluated. Results Drying took place in the falling rate period. Drying time decreased with increasing temperature, air velocity and SA coating. The Two Term model and the Wang and Singh model gained the best fit for thin‐layer drying of scallop adductors and SA film, respectively. Effective moisture diffusivity increased with temperature, velocity and SA coating and were in the range 7.352–14.620 × 10−11, 9.890–17.100 × 10−11 and 2.348–4.604 × 10−10 m2 s−1 for uncoated scallop adductors, SA coated scallop adductors and SA films, respectively. The activation energies for SA films, coated and uncoated scallop adductors were 17.07, 20.78 and 26.17 kJ mol−1, respectively. Dried scallop adductors with SA coating pretreatment exhibited a significant lower value of shrinkage rate and hardness, and higher value of toughness than uncoated ones at 30 °C and 2.0 m s−1 (P < 0.05). Conclusion Hydrocolloid coating is a promising pretreatment in improving HPD efficiency and enhancing quality attributes of dried scallop adductors. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Effects of sodium alginate‐based coating pretreatment on drying characteristics and quality of heat pump dried scallop adductors

et al. 2019

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“…The possibility of replacing boilers, which are a conventional heat source, with heat pumps has increased in the industrial field. This interest of IHPs with their integration into process and existing installations has been documented in the literature [33][34][35][36][37][38][39][40][41][42][43][44][45]. The application of IHP for industrial waste heat utilization in the food and drink is reasonable up to 100°C or even above depending on the heat pump technology applied [46].…”

Section: Non-energy Intensive ''Bottom-up'' Modelmentioning

confidence: 99%

Heat recovery using heat pumps in non-energy intensive industry: Are Energy Saving Certificates a solution for the food and drink industry in France?

2015

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“…[21] Although many experimental and theoretical investigations of heat and moisture transfer analyses of drying of wet materials have been made, energy and exergy analyses of drying systems and processes of wet materials have been studied by few researchers. [7,[16][17][18][19][20][21][22] A large amount of energy is consumed in the ceramic industry. A significant number of studies have been published in this field as well.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14][15] It is important to highlight that the exergy of an energy form or a substance is a measure of its usefulness or quality or potential to cause change. [7,[16][17][18][19][20] A thorough understanding of exergy and the insights it can provide into the efficiency and environmental impact of drying systems is required for engineers or researchers working in the area of drying technology. [21] Although many experimental and theoretical investigations of heat and moisture transfer analyses of drying of wet materials have been made, energy and exergy analyses of drying systems and processes of wet materials have been studied by few researchers.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Assessment of an Industrial Dryer in Ceramic Production

2011

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In recent years, exergy analysis has been widely used in the design, operation, and performance assessment of various thermal systems, among which drying, which is an energy intensive operation, is of a great importance. In the ceramic industry, it is aimed at utilizing a minimum amount of energy in order to remove the maximum moisture for the desired final conditions of the product to be dried. In this study, energy and exergy analyses of a ceramic plant, located in Izmir, Turkey, with a yearly production capacity of 24 million m 2 were performed using the actual operational data over a period of 12 months. The drying system at the three stages was analyzed and the values for exergy destruction and efficiency for each component of the system and the whole system at a reference (dead state) temperature of 22 C were calculated. For the month of January, energy and exergy efficiencies for the spray dryer (SD) were determined to be 65.50 and 53.7%, respectively. Energy and exergy efficiency values of the vertical dryer (VD) were 45.12 and 43.3%, respectively, and those of the furnace (F) were 35.08 and 16%, respectively. Based on this one-year assessment, the energy efficiency values for the SD, VD, and F varied between 58.48 and 65.50%, 42.44 and 50.87%, and 30.44 and 36.99%, and the exergy efficiency values were in the range of 44. 85-65.16%, 34.92-45.42%, and 12.73-16.41%, respectively.

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A review of heat pump drying: Part 1 – Systems, models and studies

Cited by 113 publications

References 49 publications

Effects of sodium alginate‐based coating pretreatment on drying characteristics and quality of heat pump dried scallop adductors

Effects of sodium alginate‐based coating pretreatment on drying characteristics and quality of heat pump dried scallop adductors

Heat recovery using heat pumps in non-energy intensive industry: Are Energy Saving Certificates a solution for the food and drink industry in France?

Performance Analysis and Assessment of an Industrial Dryer in Ceramic Production

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