Grape drying by using hybrid photovoltaic-thermal (PV/T) greenhouse dryer: An experimental study

Barnwal, P.; Tiwari, G.N.

doi:10.1016/j.solener.2008.05.012

Cited by 170 publications

(43 citation statements)

References 29 publications

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“…The global radiation composes of direct and diffuse radiation. The direct solar radiation is the component which falls from the direction of the sun [12][13][14][15][16]. The diffuse radiation component is created when the direct solar rays are scattered from the different molecules and particles in the atmosphere into all directions, i.e.…”

Section: Global Radiationmentioning

confidence: 99%

“…PCMs absorb and release heat at a nearly constant temperature. They store 5-14 times more heat per unit volume than sensible storage materials such as water [16]. Pluss ® Polymers Pvt Ltd is a materials research and manufacturing company involved in the field of Speciality Polymeric Additives and Phase Change Materials (PCMs) for thermal energy storage.…”

Section: Different Advancements In Solar Dryingmentioning

confidence: 99%

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A Review on Solar Drying of Agricultural Produce

Tiwari¹

2016

J Food Process Technol

113

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Section: Global Radiationmentioning

confidence: 99%

Section: Different Advancements In Solar Dryingmentioning

confidence: 99%

A Review on Solar Drying of Agricultural Produce

Tiwari¹

2016

J Food Process Technol

113

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“…A PVT-based solar greenhouse was designed and a one-year empirical study was conducted from June 2006 to May 2007. Barnwal et al [24] analyzed the power needed to operate a fan and determined the convective heat transfer coefficient. Another study proposed a system of air-type PVT collectors coupled with compression refrigerators [25].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of the Performance of an Air-Type Photovoltaic Thermal (PVT) System Coupled with a Heat-Recovery Ventilator

2016

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A heat-recovery ventilator (HRV) effectively conducts ventilation by recovering waste heat from indoors to outdoors during heating periods. However, dew condensation associated with the HRV system may arise due to the difference between the indoor temperature and the very low outdoor temperature in winter, and this can decrease the heat exchange efficiency. These problems can be solved by the pre-heating of the incoming air, but additional energy is required when pursuing such a strategy. On the other hand, an air-type photovoltaic thermal (PVT) system produces electricity and thermal energy simultaneously using air as the heat transfer medium. Moreover, the heated air from the air-type PVT system can be connected to the HRV to pre-heat the supply air instead of taking in the cold outdoor air. Thus, the ventilation efficiency can be improved and the problems arising during the heating period can be resolved. Consequentially, the heating energy required in a building can be reduced, with additional electricity acquired as well. In this paper, the performance of an air-type PVT system coupled with an HRV is assessed. To do this, air-type PVT collectors operating at 1 kW p were installed in an experimental house and coupled to an HRV system. Thermal performance and heating energy required during the winter season were analyzed experimentally. Furthermore, the electrical performances of the air-type PVT system with and without ventilation at the back side of the PV during the summer season were analyzed.

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“…Raisin can be produced by sun drying or artificial drying, which is energy intensive and time-consuming. Many studies have been conducted to develop new drying methods, including using chemical or physical pretreatments [1], high drying temperature, step-drying [2], and energy efficient driers [3][4][5]. Drying kinetics of grape was also extensively studied [6,7].…”

Section: Introductionmentioning

confidence: 99%

Biochemical characteristics and thermal inhibition kinetics of polyphenol oxidase extracted from Thompson seedless grape

Zheng

Shi

Pan

2012

Eur Food Res Technol

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Polyphenol oxidase (PPO) was isolated from Thompson seedless grape (Vitis vinifera 'Thompson Seedless'), and its biochemical characteristics were studied. The PPO showed activity to catechol and D, L-DOPA, but not towards monophenol L-Tyrosine, diphenols guaiacol and caffeic acid, and triphenols pyrogallic acid and gallic acid. Apparent Michaelis-Menten constant (K m ) and maximum velocity of the reaction (V max ) values were 45.0 ± 0.05 mM and 500.0 ± 15.3 OD 400 nm /min for catechol, and 34.6 ± 0.03 mM and 384.6 ± 11.7 OD 478 nm /min for D, L-DOPA, respectively. The obtained similar specificity values of V max / K m ratio of catechol and D, L-DOPA indicated their similar affinity to Thompson seedless PPO. The most effective inhibitor was L-cysteine, followed in decreasing order by ascorbic acid, sodium metabisulfite, EDTA, NaCl, and citric acid. It was discovered that metal ions of Mg 2? and Cu 2? increased, while Zn 2? and K ? reduced the PPO activity. Sugars showed inhibition on the PPO activity, with higher effect by sucrose and lower effect by fructose and glucose. Optimum pH and temperature for grape PPO activity were 6.0 and 25°C with 10 mM catechol as substrate. The enzyme was heat stable between 10 and 25°C, but showed significant activity loss at temperatures higher than 40°C and completely inactivation at 70°C for 10 min. Thermal inactivation of PPO showed a firstorder kinetic with an activation energy (E a ) of 146.1 ± 10.8 kJ/mol at pH 6.0.

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Grape drying by using hybrid photovoltaic-thermal (PV/T) greenhouse dryer: An experimental study

Cited by 170 publications

References 29 publications

A Review on Solar Drying of Agricultural Produce

A Review on Solar Drying of Agricultural Produce

Demonstration of the Performance of an Air-Type Photovoltaic Thermal (PVT) System Coupled with a Heat-Recovery Ventilator

Biochemical characteristics and thermal inhibition kinetics of polyphenol oxidase extracted from Thompson seedless grape

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