scholarly journals Diseño y análisis energético de un sistema de refrigeración autónomo para el traslado de vacunas

Author(s):  
Julio Valle-Hernández ◽  
Britania Junery Lozano-Olmedo ◽  
Joanna Díaz-Monroy ◽  
Raúl Román-Aguilar

Vaccination is one of the most important methods of promoting health in the world, to preserve the effectiveness of these pharmacological products the operation temperature range in between 2°C and 8°C. Thermoelectric coolers are solid state devices that convert electrical energy into thermal energy, although they are destined to small capacities of cooling which are of the order of 2 to 250 watts, they are optimal for the cooling of portable systems. This paper describes the design and energy analysis of a portable system for the transfer of vaccines in rural areas, which will be powered by solar energy. The design integrates the choice of thermal insulation, geometry and operation of the system. Energy analysis allows to obtain the necessary energy to maintain the vaccines at temperatures between 4 ° C and 6 ° C, from the estimation of the thermal loads, and thus the election of the photovoltaic system best suited to ensure the necessary autonomy time.

AIMS Energy ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1260-1273
Author(s):  
Abshir Ashour ◽  
◽  
Taib Iskandar Mohamad ◽  
Kamaruzzaman Sopian ◽  
Norasikin Ahmad Ludin ◽  
...  

<abstract> <p>In the rural areas of Saudi Arabia, which are not connected to the national grid, electricity is supplied mainly from diesel generators. This is not just a non-renewable energy source, but it has also resulted in environmental damage and may be hazardous to human health. In order to mitigate the problem, integration with a solar photovoltaic system is proposed. A Photovoltaic-Diesel Hybrid System (PvDHS) was designed, analyzed, and optimized based on the climate data of Yanbu, Saudi Arabia. Measured local solar insolation and climate data were used in the Hybrid Optimization Model for Electric Renewables (HOMER) software with different system components and configurations in order to optimize the design that yields the best energy cost. A system consisting of a 3 kW photovoltaic system, a 2 kW diesel engine, a 1 kW converter, and 14 kWh batteries were identified to be the most cost-effective for the average daily electricity demand of 10.5 kWh. The total Net Present Cost (NPC) of this system is $17, 800, a reduction of 50% over the $35, 770 cost of the diesel-only system. The PvDHS useful electrical energy is found to be $0.36/kWh, while the Cost of Energy (COE) of the diesel-only system is $0.72/kWh. The system is expected to pay for itself in 2.8 years and reduce CO<sub>2</sub> emissions by 8110 kg per year.</p> </abstract>


2020 ◽  
Vol 3 (2) ◽  
pp. 1
Author(s):  
Massimiliano De Mei

Too many people in the world do not have access to clean and safe water but water purification processes are energy intensive and require structures capable of supplying energy constantly. In many rural areas there is basically no electricity available and only the installation of a photovoltaic system or of any other renewable energy source, can lay the foundations for design of water purification plants. The main goal of this work was to study the effectiveness of ozone (O3) for knocking down high levels of fecal pollution and to construct a prototype for low cost sanitization (O3SU Ozone gas Sanitization Unit), able to supply limited quantities of safe water to small rural communities. Ozone gas generators were tested at 7, 14 and 21 g/h and gas flow times were determined. The ozone sanitization of waters characterized by mainly fecal contamination seems to be very effective; surely the O3SU can and must be improved through, for example, the use of more powerful ozone generators, in order to reduce the duration of the treatment and through the decreasing of the electric consumptions, that would make possible to increase the daily treatment cycles. Thus, we would be able to increase the amount of clean water available to populations living in areas where the water crisis is an unlucky and grim reality.


Author(s):  
Alvaro Laurencio Pérez ◽  
◽  
Olga Pérez Maliuk ◽  
Igor Pérez Maliuk ◽  
◽  
...  

For the year 2017, renewable energy in the world through photovoltaic systems constitutes around 21% of the total energy generated through renewable sources. In this work, the impact represented by the proposal of a photovoltaic system connected to the grid in terms of reducing losses was analyzed. In the study, the calculation tools PVSyst and DIgSILENT PowerFactory were used to determine the power generation of the photovoltaic installation. Using the Radial 7.7 tool, the power losses were determined. The energy losses of the line were determined using empirical equations developed in the literature discussed. The commissioning of the installation represents a saving of 397 MWh/year. The impact that the installation represents on the grid is represented by a decrease in electrical energy losses and not in the decrease in power losses.


2017 ◽  
Vol 2 (11) ◽  
pp. 73-78
Author(s):  
David W. Rule ◽  
Lisa N. Kelchner

Telepractice technology allows greater access to speech-language pathology services around the world. These technologies extend beyond evaluation and treatment and are shown to be used effectively in clinical supervision including graduate students and clinical fellows. In fact, a clinical fellow from the United States completed the entire supervised clinical fellowship (CF) year internationally at a rural East African hospital, meeting all requirements for state and national certification by employing telesupervision technology. Thus, telesupervision has the potential to be successfully implemented to address a range of needs including supervisory shortages, health disparities worldwide, and access to services in rural areas where speech-language pathology services are not readily available. The telesupervision experience, potential advantages, implications, and possible limitations are discussed. A brief guide for clinical fellows pursuing telesupervision is also provided.


2014 ◽  
pp. 92-105
Author(s):  
P. Bezrukikh ◽  
P. Bezrukikh (Jr.)

The article analyzes the dynamics of consumption of primary energy and production of electrical energy in the world for 1973-2012 and the volume of renewable energy. It is shown that in the crisis year of 20 0 9 there was a significant reduction in primary energy consumption and production of electrical energy. At the same time, renewable energy has developed rapidly, well above the rate of the world economy growth. The development of renewable energy is one of the most effective ways out of the crisis, taking into account its production regime, energy, environmental, social and economic efficiency. The forecast for the development of renewable energy for the period up to 2020, compiled by the IEA, is analyzed. It is shown that its assessment rates are conservative; the authors justify higher rates of development of renewable energy.


Author(s):  
Yu. Kozlov ◽  
R. Serebryakov

A new coronavirus pandemic is raging all over the world, especially in densely populated areas. Unlike most countries, more than half of the territory of Russia is not used by humans — which means that it is possible to settle large cities to avoid crowding people on a small area. The authors of the article consider wind power, namely vortex wind power plants, as a new source of energy that can be quickly and with less harm built in rural areas. The article also discusses the possibilities of an alternative Autonomous non-volatile installation "Air spring" for obtaining fresh water from atmospheric air.


2021 ◽  
pp. 097275312199850
Author(s):  
Vivek Podder ◽  
Raghuram Nagarathna ◽  
Akshay Anand ◽  
Patil S. Suchitra ◽  
Amit Kumar Singh ◽  
...  

Rationale: India has a high prevalence of noncommunicable diseases (NCDs), which can be lowered by regular physical activity. To understand this association, recent population data is required which is representative of all the states and union territories of the country. Objective: We aimed to investigate the patterns of physical activity in India, stratified by zones, body mass index (BMI), urban, rural areas, and gender. Method: We present the analysis of physical activity status from the data collected during the phase 1 of a pan-India study. This ( Niyantrita Madhumeha Bharata 2017) was a multicenter pan-India cluster sampled trial with dual objectives. A survey to identify all individuals at a high risk for diabetes, using a validated instrument called the Indian Diabetes Risk Score (IDRS), was followed by a two-armed randomized yoga-based lifestyle intervention for the primary prevention of diabetes. The physical activity was scored as per IDRS (vigorous exercise or strenuous at work = 0, moderate exercise at home/work = 10, mild exercise at home/work = 20, no exercise = 30). This was done in a selected cluster using a mobile application. A weighted prevalence was calculated based on the nonresponse rate and design weight. Results: We analyzed the data from 2,33,805 individuals; the mean age was 41.4 years (SD 13.4). Of these, 50.6% were females and 49.4% were males; 45.8% were from rural areas and 54% from urban areas. The BMI was 24.7 ± 4.6 kg/m 2 . Briefly, 20% were physically inactive and 57% of the people were either inactive or mildly active. 21.2% of females were found physically inactive, whereas 19.2% of males were inactive. Individuals living in urban localities were proportionately more inactive (21.7% vs. 18.8%) or mildly active (38.9% vs. 34.8%) than the rural people. Individuals from the central (29.6%) and south zones (28.6%) of the country were also relatively inactive, in contrast to those from the northwest zone (14.2%). The known diabetics were found to be physically inactive (28.3% vs. 19.8%) when compared with those unaware of their diabetic status. Conclusion: 20% and 37% of the population in India are not active or mildly active, respectively, and thus 57% of the surveyed population do not meet the physical activity regimen recommended by the World Health Organization. This puts a large Indian population at risk of developing various NCDs, which are being increasingly reported to be vulnerable to COVID-19 infections. India needs to adopt the four strategic objectives recommended by the World Health Organization for reducing the prevalence of physical inactivity.


Land ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 64
Author(s):  
Żanna Stręk ◽  
Przemysław Leń ◽  
Justyna Wójcik-Leń ◽  
Paweł Postek ◽  
Monika Mika ◽  
...  

In many countries of the world, rural areas are characterized by a defective spatial structure of agricultural land. The most frequent defects are large fragmentation and distribution of farmland. The fragmentation of land has been an issue widely described by many authors throughout the world. The problem of the distribution of land owned by individual farmers is slightly different, since due to the complexity of the problem this issue was not widely explored in Poland (plot patchwork) or in other countries of Europe and the world. Land fragmentation and distribution of plots in rural areas has a negative effect on the profitability and efficiency of agricultural production. Land consolidation and exchange is an operation facilitating spatial structure improvement. The authors attempted to develop a universal land exchange algorithm for eliminating the external plot patchwork. As it turns out, so far no land exchange algorithm has been developed. Specific analyses were carried out in Puchaczów commune, county of Łęczna, Lublin voivodeship in the eastern part of Poland, covering an area of 6907.80 ha, split into 15,211 plots. The chequerboard arrays method was used. The publication presents the algorithm and its practical application using a test sample. A result of the studies is a proposal concerning the exchange of land between landowners in the villages of the commune of Puchaczów. Using the algorithm, the area of individual lands in the commune, after the exchange, will increase by 172.09 ha, which is 2.5% for the area of individual lands, and 1.9% for the commune.


Author(s):  
Dieison S. Silveira ◽  
Sergio Bampi ◽  
Gabriel B. Moro ◽  
Eduardo H. M. da Cruz ◽  
Philippe O. A. Navaux ◽  
...  

2014 ◽  
Vol 953-954 ◽  
pp. 591-594
Author(s):  
Ze Jia Hua ◽  
Jing Wu ◽  
Ze Ya Mi ◽  
Jia Lei Zhu

The PV and wind hybrid power system uses the front-end DC-DC conversion circuit, the system's overall output power is unified deployment and controlled, through elaborating the component characteristics and assessing mathematical model of the actual obtained, more accurately determines operation condition of the system per hour. The system energy analysis of flow and motion makes the system in dynamic change switch from the different forms of work patterns and operation, completing the corresponding control, so as to realize the optimization of system and reliable operation.


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