Solar Powered DC Refrigerator with a Monitoring and Control System

Tsado, Jacob; Mahmood, Mohammed K.; Raji, Abdul-Latif G.; Usman, Adil; Jiya, Immanuel N.

doi:10.1109/powerafrica.2018.8521158

Cited by 7 publications

(3 citation statements)

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“…Thetotal phenolic and total flavonoid contents of the extracts recorded in this study could be responsible for the observed free radical scavenging activity of the plant extract. The IC50 reported for the five medicinal plants in this study were however, higher than 52.45±3.05 μg/mL reported for X. aethiopica [41], but lower than 263.53 mg/mL reported for Phyllanthus [42], 263.53±3.24 mg/mL reported for Senna ocidentalis [43], C. adansonii (1562.52 mg/mL) and N. laevis (155.17 mg/mL) [44]. This differences could be explained by the findings from previous studies, who reported that bioactive metabolites in medicinal plants varies with the type of plants, part of the plants, duration of sample collections and also the differences in the solvents uses in extraction process [45].This is also supported by the absence of phlobatannins in the plants investigated in this study.…”

Section: Discussioncontrasting

confidence: 81%

Antioxidants and hypoglycemic effect of some medicinal plants

Niwoye

Ndaman

Olufunmilayo

et al. 2019

GSC Biol. and Pharm. Sci.

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There is an increasing trend to replace synthetic drugs, which are of safety concern, with the natural remedies available from plant extracts. This study investigated the phytoconstituents as well as antioxidants and hypoglycemic effect of Anarcadium occidentales, Huntaria umbellata, Parkia biglobosa, Psidium guajava and Vitellaria paradoxa. Phytochemicals compositions were assayed using standard procedures. Antioxidant assays employed were ferric reducing antioxidant power and scavenging effect on the 1, 1-diphenyl-2-picrylhydrazyl radicals. Oral glucose tolerance test (OGTT) and amylase inhibitory assays were employed for hypoglycemic study. The concentration of phenols ranges from 184.368±0.23 mg/g (Anacardium occidentales) to 120.241±0.01 mg/g (Hunteria umbellata). However, Hunteria umbellata extract had the highest alkaloids (76.76±0.01 mg/g), Parkia biglobosa extract had the highest tanins (137.55±0.05 mg/g) while Vitellaria paradoxa extract had higher saponins (188.50±0.01 mg/g). Flavonoids was higher in Parkia biglobosa (458.06±0.06 mg/g) while Psidium guajava had the least. In DPPH assay A. occidentales extract had the lowest IC50 (217.78±3.45 µg/ml) comparable with the standards while H. umbellata had the highest (IC50=311.72±3.45 µg/ml) and thus lowest activity. Anarcadium occidentales had higher α-amylase inhibitory activity (IC50 =171.13±0.14μg/ml) while Psidium guajava (IC50 =304.64 ±0.14μg/ml) had the least activity. Oral glucose tolerance revealed the activities of the extracts in order of Anacardium occidentales>Hunteria umbellata>Vitellaria paradoxa>Parkia biglobosa>Psidium guajava. In conclusion, five medicinal plants investigated in this study possesses some antioxidants and hypoglycemic properties with Anacardium occidentales extract being the most potent, which may be attributed to their polyphenolic constituents.

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Section: Discussioncontrasting

confidence: 81%

Antioxidants and hypoglycemic effect of some medicinal plants

Niwoye

Ndaman

Olufunmilayo

et al. 2019

GSC Biol. and Pharm. Sci.

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“…A system [12] made of a solar powered DC refrigerator, a microcontroller to monitor the temperature, two PV panel connected in parallel was implemented. Their experiment showed that this type of refrigerator can be powered by using renewable energy, in this case solar energy.…”

Section: Previous Workmentioning

confidence: 99%

Photovoltaic-Thermoelectric Hybrid Module for Continuously Powering a Vaccine Cooler in Niger

Adam

YESİLATA

2023

JISE

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In areas where the access to an off-grid electricity is not possible or not reliable, the transport and conservation of vaccine and medicines is not possible. Nevertheless, these areas need and have right to access medical. This need is much more critical nowadays since preservation of COVID-19 vaccines require cold-chain at some level of degree. Solar energy can be used to power the refrigerator destined to keep the medicines and vaccines cool. Even tough stand-alone PV is already used to power theses coolers, the use of a PV-TE hybrid generators could allow the improvement of the autonomy. The output power of the PV alone and the hybrid are investigated under Niger meteorological conditions. The two systems coupled with a medical cooler are investigated. The results show that the hybrid system produces considerably more power to be stored in the battery, indicating much longer autonomy.

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“…The optimal operating conditions could be carried out thanks to a refrigerator map provided by an experimental characterisation of the set cabinet-refrigeration circuit. Even if the literature [1][2][3][4] offers a lot of experimental works each on the optimal control and on the methodology to characterise a VCDC refrigerator, there is a gap in performance evaluation of VCDC refrigerators using a hot-wall condenser. Currently, hotwall condensers are being extensively used round the world, especially in the Asian market, mostly due to aesthetic and value reasons.…”

Section: Introductionmentioning

confidence: 99%

On the optimisation of a direct current (dc) hot-wall refrigerator

Aprea

Maiorino

2020

E3S Web Conf.

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This study presents an experimental investigation conducted on a refrigerator powered by direct current and composed of a 166L cabinet, a condenser embedded in the external wall of the compartment (hot-wall), an internal static evaporator, a hermetic variable speed compressor. The refrigerant fluid used is the R290a, a natural fluid. By placing the refrigerator in a temperature-controlled environment, four external temperatures have experimented: 22, 25, 29 and 32 °C. Three different temperature setpoints have been set for each temperature: -5, -10, -20 °C. In this way, 12 test conditions were defined, and each of them was repeated by imposing four different compressor rotation speeds: 2000, 2500, 3000, 3500 rpm. The set of tests allowed to identify for each operating condition the optimal number of operating revolutions aimed at minimising the energy consumption of the analysed device.

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Solar Powered DC Refrigerator with a Monitoring and Control System

Cited by 7 publications

References 0 publications

Antioxidants and hypoglycemic effect of some medicinal plants

Antioxidants and hypoglycemic effect of some medicinal plants

Photovoltaic-Thermoelectric Hybrid Module for Continuously Powering a Vaccine Cooler in Niger

On the optimisation of a direct current (dc) hot-wall refrigerator

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