Energy and exergy analyses of the solar drying processes of ghost chilli pepper and ginger

Rabha, Deva Kanta; Muthukumar, P.; Somayaji, Chandramohan

doi:10.1016/j.renene.2017.01.007

Cited by 165 publications

(49 citation statements)

References 26 publications

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“…Similar results were obtained by Rabha et al (2017), Ozgener and Ozgener (2009), Khanali et al (2013) and Aghbashlo et al (2012). However, other authors (Ranjbaran andZare, 2013, Aghbashlo et al 2008a) observed that the exergy efficiency increases with the temperature augmentation; this can be due to moisture saturated surface for which more heat is utilized to evaporate the free moisture.…”

Section: Resultssupporting

confidence: 74%

“…The energy losses during the drying process were estimated through the exergy. Rabha et al (2017) realized energy and exergy analyses of the solar drying processes of ghost chilli pepper and ginger, using a forced convection solar tunnel dryer integrated with a shell and tube based latent heat storage module. They concluded that the thermal efficiencies of the first and the second solar air heaters varied between 22.10% and 40.24% and 9.64% and 19.50%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Exergy Analyses of Onion Drying by Convection: Influence of Dryer Parameters on Its Performance

Castro¹,

Román²,

Echegaray³

et al. 2018

Preprint

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This research work is concerned in the exergy analysis of the continuous-convection drying of onion. The influence of temperature and air flow rate was studied in terms of exergy parameters. The energy and exergy balances were carried out taking into account the onion drying chamber. Its behaviour was analysed based on exergy efficiency, exergy loss rate, exergetic improvement potential rate and sustainability index.The exergy loss rates increase with the temperature and air flow rate augmentation.Exergy loss rate is augmented at higher drying air temperatures and flow rates because the overall heat transfer coefficient increase. On the other hand, the exergy efficiency increases with the air flow rate augmentation. This behavior is due to the energy utilization was improved because the most amount of supplied energy was utilized for the moisture evaporation. However, the exergy efficiency decreases with the temperature augmentation due to the free moisture is less, then, the moisture begins diffusing from the internal structure to the surface. The exergetic improvement potential rate values show that the onion drying process presents a high potential to improve the exergy efficiency. The sustainability index of the drying chamber varied from 1.9 to 5.1. To reduce the environmental impact of the process, the parameters must be modified in order to ameliorate the exergy efficiency of the process.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Exergy Analyses of Onion Drying by Convection: Influence of Dryer Parameters on Its Performance

Castro¹,

Román²,

Echegaray³

et al. 2018

Preprint

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show abstract

“…Drying is preservation method for foods that involves the thermal process to vaporize moisture content [18]. This methods have been reported and can change undesirable physical and chemical properties of product [19,20].…”

Section: Introductionmentioning

confidence: 99%

Thermal Degradation Kinetics of Capsaicin on Blanching-Brine-Calcium Pretreatment Red Chili Pepper Drying

Arifin

Djaeni

2018

Bull. Chem. React. Eng. Catal.

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Post-harvest red chili pepper (Capsicum frutescens) has highly capsaicin as bioactive compound and moisture content. However, capsaicin is the responsible bioactive compound in chili for hot sensation that easy to degrade by partial oxidation caused introduction of heat in drying process. The objective of this research was to investigate kinetics of capsaicin degradation in the drying process under blanching-brine-calcium pretreatment and various temperatures. For this purposes, chili provided local farmer was pretreated using blanching-brine-calcium pretreatment. Afterward, they were dried at 40, 50, 60, and 70 o C for 8 hours. Degradation of capsaicin content was observed every 2 hours using Thin Layer Chromatography (TLC). Results showed kinetics of capsaicin degradation was categorized as second order reaction. At the same temperature and time, capsaicin retention of blanching-brinecalcium pretreated chili has highest value. The temperature dependence of the capsaicin degradation rate was analyzed using Arrhenius correlation. The activation energy for degradation rate of capsaicin during drying was around 45.10367 kJ/mol.K. It indicated the degradation rate increased as well as increased the temperature at the same time.

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“…The specific energy consumption and drying efficiency were 1.86 kWh/kg and 25.6%, respectively. For the drying of chili peppers, solar dryers have mostly been employed experimentally, such as for cabinet drying systems (Tunde‐Akintunde, ; Tunde‐akintunde & Afolabi, ), an indirect solar dryer with a solar collector (Fudholi et al, ), a greenhouse dryer with heater (Nimrothama et al, ) and a forced convection solar tunnel dryer (Rabha, Muthukumar, & Somayaji, ). In the case of dryer‐heat pump integration, it was utilized in the vacuum drying system because the drying technique could provide a high drying rate, low drying temperature and an oxygen deficient drying environment (Artnaseaw, Theerakulpisut, & Benjapiyaporn, ).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of solar‐assisted heat pump dryer with heat recovery for the drying of chili peppers

Naemsai

Jareanjit

Thongkaew

2019

J Food Process Engineering

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This research investigated the performance of a solar‐assisted heat pump dryer (SAHPD) with heat recovery to reduce the amount of thermal energy needed for drying chili peppers. The dryer selected for the experimental study consisted of a heat pump, a greenhouse cover and multi trays. It was found that the SAHPD with recovery gave better drying performance than a traditional dying method. The dryer system can offer drying time, drying efficiency, coefficient of performance and specific energy consumption of approximately 24 hr, 33.2%, 3.17, and 2.21 kWh/kg, respectively. Furthermore, the SAHPD with heat recovery provided a higher drying performance than without the heat recovery although the ambient condition changed. Base on the economic analysis, the payback period and net present value of the SAHPD with heat recovery were approximately 1.9 years and 915.60 USD. The SAHPD with two drying rooms also yielded better drying performance than the SAHPD with one room. Practical applications Drying is the process of moisture reduction to a safe limit of moisture content, which allows agriculture to extend the shelf life of the crops by restraining the growth of microorganism. In chili peppers drying process, a solar assisted heat pump drying as one of hybrid solar dryers is preferred because heat and mass transfer rate are rather high and it offers the ability to operate both daytime and nighttime. However, the exhausted air to the ambient still has considerable thermal energy. Thus, the heat recovery system has been employed to design and fabricate inside the dryer. Findings of this research contribute to the evaluation of heat recovery in a typical solar assisted heat pump dryer in terms of drying efficiency and economic feasibility in order to be a guideline for small and medium‐sized enterprises.

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Energy and exergy analyses of the solar drying processes of ghost chilli pepper and ginger

Cited by 165 publications

References 26 publications

Exergy Analyses of Onion Drying by Convection: Influence of Dryer Parameters on Its Performance

Exergy Analyses of Onion Drying by Convection: Influence of Dryer Parameters on Its Performance

Thermal Degradation Kinetics of Capsaicin on Blanching-Brine-Calcium Pretreatment Red Chili Pepper Drying

Experimental investigation of solar‐assisted heat pump dryer with heat recovery for the drying of chili peppers

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