Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber

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BABU, A. K.;KUMARESAN, G. ;ANTONY AROUL RAJ, V. ;VELRAJ, R. .
Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 66, n.4, p. 254-265, april 2020. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/experimental-findings-of-batch-drying-chamber-for-thin-layer-drying-of-leaves/>. Date accessed: 24 sep. 2020. 
doi:http://dx.doi.org/10.5545/sv-jme.2019.6510.
Babu, A., Kumaresan, G., Antony Aroul Raj, V., & Velraj, R.
(2020).
Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber.
Strojniški vestnik - Journal of Mechanical Engineering, 66(4), 254-265.
doi:http://dx.doi.org/10.5545/sv-jme.2019.6510
@article{sv-jmesv-jme.2019.6510,
	author = {A. K. Babu and G.  Kumaresan and V.  Antony Aroul Raj and R.  Velraj},
	title = {Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {66},
	number = {4},
	year = {2020},
	keywords = {Amaranth leaves, batch dryer, heat pump dryer, coefficient of performance, thin-layer drying},
	abstract = {The design of a batch drying chamber with multiple trays for the thin-layer drying of fragile, heat-sensitive food materials, such as edible leaves, is a challenging task. It is essential to ensure good air distribution with minimum pressure drop in all the compartments of the drying chamber to obtain uniform drying of the product. In the present work, a drying chamber that was optimized from different configurations using computational fluid dynamics (CFD) software was fabricated and tested in the heat pump dryer. The experimental investigation was carried out with an optimized configuration for the temperature range of 50 ºC to 60 ºC, the relative humidity range of 20 % to 12 %, and air velocities of 1.41 m/s, 2.39 m/s, and 3.24 m/s. These optimal operating conditions were chosen based on an extensive literature survey on leaf drying. It was found that the drying process took place only in the falling rate period, fully controlled by the mechanism of liquid diffusion. The effects of air velocity on the performance parameters of the dryer were studied. Calculations based on the mean average parameters of the experimental data showed that a relatively higher heat utilization factor (0.17), moisture extraction ratio (0.375 kg/h), specific moisture extraction ratio (0.1529 kg/(kWh)), coefficient of performance (4.60), drying efficiency (76.23 %) and lower specific energy consumption (1.16 kW/kg) were obtained for a moderate drying velocity of 2.39 m/s in the heat pump drying process due to higher convection mass and heat transfer effects. Drying curves were plotted for different drying conditions and discussed. The findings were in agreement with those of many earlier research studies listed in the references section. The tested drying chamber can be used for drying all kinds of leaves in a heat pump dryer.},
	issn = {0039-2480},	pages = {254-265},	doi = {10.5545/sv-jme.2019.6510},
	url = {https://www.sv-jme.eu/article/experimental-findings-of-batch-drying-chamber-for-thin-layer-drying-of-leaves/}
}
Babu, A.,Kumaresan, G.,Antony Aroul Raj, V.,Velraj, R.
2020 April 66. Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 66:4
%A Babu, A. K.
%A Kumaresan, G. 
%A Antony Aroul Raj, V. 
%A Velraj, R. 
%D 2020
%T Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber
%B 2020
%9 Amaranth leaves, batch dryer, heat pump dryer, coefficient of performance, thin-layer drying
%! Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber
%K Amaranth leaves, batch dryer, heat pump dryer, coefficient of performance, thin-layer drying
%X The design of a batch drying chamber with multiple trays for the thin-layer drying of fragile, heat-sensitive food materials, such as edible leaves, is a challenging task. It is essential to ensure good air distribution with minimum pressure drop in all the compartments of the drying chamber to obtain uniform drying of the product. In the present work, a drying chamber that was optimized from different configurations using computational fluid dynamics (CFD) software was fabricated and tested in the heat pump dryer. The experimental investigation was carried out with an optimized configuration for the temperature range of 50 ºC to 60 ºC, the relative humidity range of 20 % to 12 %, and air velocities of 1.41 m/s, 2.39 m/s, and 3.24 m/s. These optimal operating conditions were chosen based on an extensive literature survey on leaf drying. It was found that the drying process took place only in the falling rate period, fully controlled by the mechanism of liquid diffusion. The effects of air velocity on the performance parameters of the dryer were studied. Calculations based on the mean average parameters of the experimental data showed that a relatively higher heat utilization factor (0.17), moisture extraction ratio (0.375 kg/h), specific moisture extraction ratio (0.1529 kg/(kWh)), coefficient of performance (4.60), drying efficiency (76.23 %) and lower specific energy consumption (1.16 kW/kg) were obtained for a moderate drying velocity of 2.39 m/s in the heat pump drying process due to higher convection mass and heat transfer effects. Drying curves were plotted for different drying conditions and discussed. The findings were in agreement with those of many earlier research studies listed in the references section. The tested drying chamber can be used for drying all kinds of leaves in a heat pump dryer.
%U https://www.sv-jme.eu/article/experimental-findings-of-batch-drying-chamber-for-thin-layer-drying-of-leaves/
%0 Journal Article
%R 10.5545/sv-jme.2019.6510
%& 254
%P 12
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 66
%N 4
%@ 0039-2480
%8 2020-04-17
%7 2020-04-17
Babu, A., G.  Kumaresan, V.  Antony Aroul Raj, & R.  Velraj.
"Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber." Strojniški vestnik - Journal of Mechanical Engineering [Online], 66.4 (2020): 254-265. Web.  24 Sep. 2020
TY  - JOUR
AU  - Babu, A. K.
AU  - Kumaresan, G. 
AU  - Antony Aroul Raj, V. 
AU  - Velraj, R. 
PY  - 2020
TI  - Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2019.6510
KW  - Amaranth leaves, batch dryer, heat pump dryer, coefficient of performance, thin-layer drying
N2  - The design of a batch drying chamber with multiple trays for the thin-layer drying of fragile, heat-sensitive food materials, such as edible leaves, is a challenging task. It is essential to ensure good air distribution with minimum pressure drop in all the compartments of the drying chamber to obtain uniform drying of the product. In the present work, a drying chamber that was optimized from different configurations using computational fluid dynamics (CFD) software was fabricated and tested in the heat pump dryer. The experimental investigation was carried out with an optimized configuration for the temperature range of 50 ºC to 60 ºC, the relative humidity range of 20 % to 12 %, and air velocities of 1.41 m/s, 2.39 m/s, and 3.24 m/s. These optimal operating conditions were chosen based on an extensive literature survey on leaf drying. It was found that the drying process took place only in the falling rate period, fully controlled by the mechanism of liquid diffusion. The effects of air velocity on the performance parameters of the dryer were studied. Calculations based on the mean average parameters of the experimental data showed that a relatively higher heat utilization factor (0.17), moisture extraction ratio (0.375 kg/h), specific moisture extraction ratio (0.1529 kg/(kWh)), coefficient of performance (4.60), drying efficiency (76.23 %) and lower specific energy consumption (1.16 kW/kg) were obtained for a moderate drying velocity of 2.39 m/s in the heat pump drying process due to higher convection mass and heat transfer effects. Drying curves were plotted for different drying conditions and discussed. The findings were in agreement with those of many earlier research studies listed in the references section. The tested drying chamber can be used for drying all kinds of leaves in a heat pump dryer.
UR  - https://www.sv-jme.eu/article/experimental-findings-of-batch-drying-chamber-for-thin-layer-drying-of-leaves/
@article{{sv-jme}{sv-jme.2019.6510},
	author = {Babu, A., Kumaresan, G., Antony Aroul Raj, V., Velraj, R.},
	title = {Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {66},
	number = {4},
	year = {2020},
	doi = {10.5545/sv-jme.2019.6510},
	url = {https://www.sv-jme.eu/article/experimental-findings-of-batch-drying-chamber-for-thin-layer-drying-of-leaves/}
}
TY  - JOUR
AU  - Babu, A. K.
AU  - Kumaresan, G. 
AU  - Antony Aroul Raj, V. 
AU  - Velraj, R. 
PY  - 2020/04/17
TI  - Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 66, No 4 (2020): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2019.6510
KW  - Amaranth leaves, batch dryer, heat pump dryer, coefficient of performance, thin-layer drying
N2  - The design of a batch drying chamber with multiple trays for the thin-layer drying of fragile, heat-sensitive food materials, such as edible leaves, is a challenging task. It is essential to ensure good air distribution with minimum pressure drop in all the compartments of the drying chamber to obtain uniform drying of the product. In the present work, a drying chamber that was optimized from different configurations using computational fluid dynamics (CFD) software was fabricated and tested in the heat pump dryer. The experimental investigation was carried out with an optimized configuration for the temperature range of 50 ºC to 60 ºC, the relative humidity range of 20 % to 12 %, and air velocities of 1.41 m/s, 2.39 m/s, and 3.24 m/s. These optimal operating conditions were chosen based on an extensive literature survey on leaf drying. It was found that the drying process took place only in the falling rate period, fully controlled by the mechanism of liquid diffusion. The effects of air velocity on the performance parameters of the dryer were studied. Calculations based on the mean average parameters of the experimental data showed that a relatively higher heat utilization factor (0.17), moisture extraction ratio (0.375 kg/h), specific moisture extraction ratio (0.1529 kg/(kWh)), coefficient of performance (4.60), drying efficiency (76.23 %) and lower specific energy consumption (1.16 kW/kg) were obtained for a moderate drying velocity of 2.39 m/s in the heat pump drying process due to higher convection mass and heat transfer effects. Drying curves were plotted for different drying conditions and discussed. The findings were in agreement with those of many earlier research studies listed in the references section. The tested drying chamber can be used for drying all kinds of leaves in a heat pump dryer.
UR  - https://www.sv-jme.eu/article/experimental-findings-of-batch-drying-chamber-for-thin-layer-drying-of-leaves/
Babu, A., Kumaresan, G., Antony Aroul Raj, V., AND Velraj, R..
"Experimental Investigations of Thin-layer Drying of Leaves in a Heat-Pump Assisted Tray-type Batch Drying Chamber" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 66 Number 4 (17 April 2020)

Authors

Affiliations

  • Easwari Engineering College, Department of Automobile Engineering, Chennai, India 1
  • Anna University, Institute for Energy Studies, Chennai, India 2
  • Easwari Engineering College, Department of Mechanical Engineering, Chennai, India 3
  • Institute for Energy Studies, Anna University, Chennai, India 4

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 66(2020)4, 254-265

https://doi.org/10.5545/sv-jme.2019.6510

The design of a batch drying chamber with multiple trays for the thin-layer drying of fragile, heat-sensitive food materials, such as edible leaves, is a challenging task. It is essential to ensure good air distribution with minimum pressure drop in all the compartments of the drying chamber to obtain uniform drying of the product. In the present work, a drying chamber that was optimized from different configurations using computational fluid dynamics (CFD) software was fabricated and tested in the heat pump dryer. The experimental investigation was carried out with an optimized configuration for the temperature range of 50 ºC to 60 ºC, the relative humidity range of 20 % to 12 %, and air velocities of 1.41 m/s, 2.39 m/s, and 3.24 m/s. These optimal operating conditions were chosen based on an extensive literature survey on leaf drying. It was found that the drying process took place only in the falling rate period, fully controlled by the mechanism of liquid diffusion. The effects of air velocity on the performance parameters of the dryer were studied. Calculations based on the mean average parameters of the experimental data showed that a relatively higher heat utilization factor (0.17), moisture extraction ratio (0.375 kg/h), specific moisture extraction ratio (0.1529 kg/(kWh)), coefficient of performance (4.60), drying efficiency (76.23 %) and lower specific energy consumption (1.16 kW/kg) were obtained for a moderate drying velocity of 2.39 m/s in the heat pump drying process due to higher convection mass and heat transfer effects. Drying curves were plotted for different drying conditions and discussed. The findings were in agreement with those of many earlier research studies listed in the references section. The tested drying chamber can be used for drying all kinds of leaves in a heat pump dryer.

Amaranth leaves, batch dryer, heat pump dryer, coefficient of performance, thin-layer drying