Extending the shelf-life of vegetables using low cost evaporative cooling systems in Mali

2020 ◽  
pp. 419-426
Author(s):  
W. Bihon ◽  
A. Coulibaly ◽  
T. Chagomoka ◽  
O. Sanogo ◽  
F. Cisse ◽  
...  
Keyword(s):  
Shelf Life ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Cooling Systems

scholarly journals Experiments on Energy-Efficient Evaporative Cooling Systems for Poultry Farm Application in Multan (Pakistan)

2021 ◽  
Vol 13 (5) ◽  
pp. 2836
Author(s):  
Khawar Shahzad ◽  
Muhammad Sultan ◽  
Muhammad Bilal ◽  
Hadeed Ashraf ◽  
Muhammad Farooq ◽  
...  
Keyword(s):  
Heat Stress ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Thermal Exposure ◽  
Climatic Conditions ◽  
The Body ◽  
Dew Point ◽  
Sweat Glands ◽  
Cooling Systems ◽  
Humidity Index

Poultry are one of the most vulnerable species of its kind once the temperature-humidity nexus is explored. This is so because the broilers lack sweat glands as compared to humans and undergo panting process to mitigate their latent heat (moisture produced in the body) in the air. As a result, moisture production inside poultry house needs to be maintained to avoid any serious health and welfare complications. Several strategies such as compressor-based air-conditioning systems have been implemented worldwide to attenuate the heat stress in poultry, but these are not economical. Therefore, this study focuses on the development of low-cost and environmentally friendly improved evaporative cooling systems (DEC, IEC, MEC) from the viewpoint of heat stress in poultry houses. Thermodynamic analysis of these systems was carried out for the climatic conditions of Multan, Pakistan. The results appreciably controlled the environmental conditions which showed that for the months of April, May, and June, the decrease in temperature by direct evaporative cooling (DEC), indirect evaporative cooling (IEC), and Maisotsenko-Cycle evaporative cooling (MEC) systems is 7–10 °C, 5–6.5 °C, and 9.5–12 °C, respectively. In case of July, August, and September, the decrease in temperature by DEC, IEC, and MEC systems is 5.5–7 °C, 3.5–4.5 °C, and 7–7.5 °C, respectively. In addition, drop in temperature-humidity index (THI) values by DEC, IEC, and MEC is 3.5–9 °C, 3–7 °C, and 5.5–10 °C, respectively for all months. Optimum temperature and relative humidity conditions are determined for poultry birds and thereby, systems’ performance is thermodynamically evaluated for poultry farms from the viewpoint of THI, temperature-humidity-velocity index (THVI), and thermal exposure time (ET). From the analysis, it is concluded that MEC system performed relatively better than others due to its ability of dew-point cooling and achieved THI threshold limit with reasonable temperature and humidity indexes.

scholarly journals A Study on Low Cost Post Harvest Storage Techniques to Extend the Shelf Life of Citrus Fruits and Vegetables

2019 ◽  
pp. 1-17
Author(s):  
Fahmida Ishaque ◽  
Md. Altaf Hossain ◽  
Md. Abdur Rashid Sarker ◽  
Md. Yunus Mia ◽  
Atik Shahriar Dhrubo ◽  
...  
Keyword(s):  
Weight Loss ◽  
Shelf Life ◽  
Fruits And Vegetables ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Ambient Condition ◽  
Citrus Fruits ◽  
Storage Structure ◽  
Post Harvest ◽  
Room Condition

An attempt was made to develop low cost porous evaporative cooling storage structures for extending the shelf life of citrus fruits and vegetables at the Sylhet Agricultural University campus, Bangladesh. Clay soil, bamboo and straw were used as a wall material. Sand, clay, zeolite, rice husk and charcoal etc. were used as a pad material. But the mixture of sand and clay was found as the most efficient pad materials for lowering temperature. Porous evaporative cooling storage structure (PECSS) was developed to reduce the problems of post-harvest losses at farmer level. It is eco-friendly and no energy requirements for storage of vegetables and fruits. PECSS improves the quality and productivity of vegetables and citrus fruits by reducing temperature, prolonging shelf life and reducing post-harvest losses respectively. The study revealed that shelf life of egg-plant (Solanum melongena) was 11 days in PECSS condition and it was 6 days in ambient condition. Therefore, weight loss was 4.07% for PECSS and 11.84% in room condition respectively. Storage life of Ladies finger (Abelmoschus esculentus) was 6 days more in PECSS condition than room condition. Weight loss was 6.62% in PECSS condition and 17.47% loss in ambient condition. In case of Malabar Spinach (Basella alba) it was 6 days for PECSS condition and 3 days for room condition and weight loss was found to be 9.48% and 16.17% respectively. The shelf life of stem amaranth (Amaranthus cruentus) was 5 days in PECSS condition and 2 days in ambient condition. Weight loss was found 7.05% at PECSS condition and 28.62% as in-room condition. By chemical analysis for fruits lemon (Citrus limon) and orange (Citrus sinensis) found that pH and TSS were increased both ambient and PECSS condition but in PECSS condition this rate was less than ambient condition. Vitamin C, percentage juice content, citric acid values all were decrease at both condition but in PECSS condition its rate was the less ambient condition. There is scope for intensive study to improve the firmness of the porous evaporative cooling storage structure (PECSS) to reduce the storage loss of vegetables and citrus fruits for different region and its suitability for large scale design.

New corrosion inhibitors for evaporative cooling systems

2013 ◽  
Vol 44 (1) ◽  
pp. 39-54
Author(s):  
A. Wehlmann ◽  
W. Hater ◽  
F. Wolf ◽  
R. Lunkenheimer ◽  
C. Foret ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Evaporative Cooling ◽  
Cooling Systems

scholarly journals Engineering and characterization of gymnosperm sapwood toward enabling the design of water filtration devices

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Krithika Ramchander ◽  
Megha Hegde ◽  
Anish Paul Antony ◽  
Luda Wang ◽  
Kendra Leith ◽  
...  
Keyword(s):  
Shelf Life ◽  
Social Acceptance ◽  
Low Cost ◽  
Global Scale ◽  
Coliform Bacteria ◽  
Diverse Range ◽  
Water Filter ◽  
Synthetic Test ◽  
Xylem Tissue ◽  
Filtration Material

AbstractNaturally-occurring membranes in the xylem tissue of gymnosperm sapwood enable its use as an abundantly-available material to construct filters, with potential to facilitate access to safe drinking water in resource-constrained settings. However, the material’s behavior as a filter is poorly understood, and challenges such as short shelf life have not been addressed. Here, we characterize the operational attributes of xylem filters and show that the material exhibits a highly non-linear dependence of flow resistance on thickness upon drying, and a tendency for self-blocking. We develop guidelines for the design and fabrication of xylem filters, demonstrate gravity-operated filters with shelf life >2 years, and show that the filters can provide >3 log removal of E. coli, MS-2 phage, and rotavirus from synthetic test waters and coliform bacteria from contaminated spring, tap, and ground waters. Through interviews and workshops in India, we use a user-centric approach to design a prototype filtration device with daily- to weekly-replaceable xylem filters, and uncover indicators of social acceptance of xylem as a natural water filter. Our work enhances the understanding of xylem as a filtration material, and opens opportunities for engineering a diverse range of low-cost, biodegradable xylem-based filtration products on a global scale.

scholarly journals Performance Characteristics of Solid-Desiccant Evaporative Cooling Systems

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2574 ◽  
Author(s):  
Ramadas Narayanan ◽  
Edward Halawa ◽  
Sanjeev Jain
Keyword(s):  
Air Conditioning ◽  
Natural Ventilation ◽  
Waste Heat ◽  
Numerical Study ◽  
Evaporative Cooling ◽  
Peak Load ◽  
Dew Point ◽  
Low Grade ◽  
Subtropical Climate ◽  
Cooling Systems

Air conditioning accounts for up to 50% of energy use in buildings. Increased air-conditioning-system installations not only increase total energy consumption but also raise peak load demand. Desiccant evaporative cooling systems use low-grade thermal energy, such as solar energy and waste heat, instead of electricity to provide thermal comfort. This system can potentially lead to significant energy saving, reduction in carbon emissions, and it has a low dew-point operation and large capacity range. Their light weight, simplicity of design, and close-to-atmospheric operation make them easy to maintain. This paper evaluates the applicability of this technology to the climatic conditions of Brisbane, Queensland, Australia, specifically for the residential sector. Given the subtropical climate of Brisbane, where humidity levels are not excessively high during cooling periods, the numerical study shows that such a system can be a potential alternative to conventional compression-based air-conditioning systems. Nevertheless, the installation of such a system in Brisbane’s climate zone requires careful design, proper selection of components, and a cheap heat source for regeneration. The paper also discusses the economy-cycle options for this system in such a climate and compares its effectiveness to natural ventilation.

scholarly journals Modeling of Potato Shelf Life on Evaporative Cooling Storage

2017 ◽  
Vol 4 (1) ◽  
pp. 5-13
Author(s):  
Md. Ashrafuzzaman Gulandaz ◽  
Abu Sayed ◽  
M Nur-A- Alam ◽  
M.A. Hossain ◽  
Mahedi Hasan ◽  
...  
Keyword(s):  
Shelf Life ◽  
Evaporative Cooling

scholarly journals Calculation of Water Evaporative Cooling Systems in Animal Husbandry

2020 ◽  
pp. 35-38
Author(s):  
N.N. Novikov ◽  
Keyword(s):  
Air Conditioning ◽  
Evaporation Rate ◽  
Evaporative Cooling ◽  
Animal Husbandry ◽  
Water Evaporation ◽  
Cooling Systems ◽  
Temperature And Humidity ◽  
Hot Weather ◽  
Livestock Building ◽  
Air Exchange

A method for calculating the parameters of the microclimate in a livestock building using water-evaporative air conditioning is described. It makes it possible to choose a rational temperature and humidity conditions for a room in hot weather, calculate the required air exchange, water evaporation rate and select the appropriate equipment.

scholarly journals PERUBAHAN KADAR AIR DAN PATI UBI JALAR (Ipomea batatas L.) SEGAR PADA SISTEM PENYIMPANAN SEDERHANA

2018 ◽  
Vol 13 (3) ◽  
pp. 136
Author(s):  
Maftuh Kafiya ◽  
Nfn. Sutrisno ◽  
Rizal Syarief
Keyword(s):  
Shelf Life ◽  
Sweet Potato ◽  
Starch Content ◽  
Low Cost ◽  
Storage Period ◽  
Black Rot ◽  
Underground Storage ◽  
Postharvest Diseases ◽  
Randomized Design ◽  
Ipomea Batatas

<p>Penyimpanan ubi jalar di daerah infrastruktur terbatas yang mengutamakan kesederhanaan teknologi dan kemurahan biaya diupayakan dengan menggunakan bahan-bahan lokal yang tersedia seperti pasir, jerami dan serbuk gergaji. Selama penyimpanan, kandungan nutrisi di dalam ubi jalar berpotensi mengalami perubahan, khususnya kandungan air dan pati sehingga memengaruhi mutu ubi jalar. Umur simpan ubi jalar ditandai dengan pembusukan, berupa penurunan mutu dan tanda-tanda penyakit yang disebabkan oleh mikroorganisme. Penelitian ini bertujuan melakukan identifikasi dan analisis teknologi terbaik dengan memperhatikan perubahan kadar air dan pati serta penyakit yang menjadi penentu perubahan mutu ubi jalar. Rancangan percobaan yang digunakan adalah rancangan acak lengkap dengan 4 taraf perlakuan penyimpanan yaitu di dalam tanah dengan alas tumpukan pasir-jerami (P1), di dalam tanah dengan alas tumpukan plastik-jerami (P2), di dalam kotak kayu dengan taburan serbuk gergaji (P3) dan di ruang gudang dengan alas terpal (P4). Hasil penelitian menunjukkan bahwa metode penyimpanan memberikan pengaruh terhadap suhu dan RH ruang penyimpanan dengan nilai masing-masing adalah 28,72 oC dan 78.55% (P1), 28,85 oC dan 78,51% (P2), 29,54 oC dan 73,15% (P3), serta 29,61 oC dan 68.07% (P4). Kadar air dan pati mengalami penurunan selama penyimpanan pada semua perlakuan hingga akhir penyimpanan dengan kadar terendah pada perlakuan P4 yang masing-masing sebesar 58,96 dan 11,35%. Sedangkan penyakit yang dapat diidentifikasi pada penelitian ini adalah busuk Fusarium pada penyimpanan P4 dan penyakit java black rot pada penyimpanan P2. Berdasarkan metode pendugaan umur simpan, maka penyimpanan di dalam tanah dengan alas tumpukan pasir-jerami (P1) merupakan metode terbaik dengan umur simpan diduga mencapai 35 hari.</p><p align="center"><strong>English Version Abstract</strong></p><p align="center"><strong><strong>Extra Quality Sweet Potato (<em>Ipomea batatas L</em>) Fresh on the System Rural Scale Storage</strong></strong></p><p>Sweet potato storage in areas with limited infrastructure which focuses on a simple and low-cost technology is conducted by using local materials, such as sand, straw, and sawdust. During the storage period, sweetpotato’s nutrition content will potentially deteriorate, particularly in moisture and starch content. This will eventually affect the quality of sweetpotato. The shelf life of sweetpotato is marked by the spoilage in the form of quality deterioration and some noticeable signs of diseases, most of which are induced by microorganism. This study aimed to study the best technology to evaluate quality change, diseases and shelf life of sweetpotato. The experimental design used was completely randomized design of 4 factors by using various storage ways, i.e. underground storage with sand-straw (P1), underground storage with plastic-straw (P2), inside a wooden box with sprinkling of sawdust (P3), and inside a warehouse with a tarpoulin mat (P4). The results showed that the storage treatments influenced the temperature and RH in a storage room with the values as follows: 8.72 ° C and 78.55% (P1), 28.85 C and 78.51% (P2), 29.54 and 73.15 ° C % (P3), and 29.61 ° C and 68.07% (P4). Moisture and starch contents in sweet potato significantly decreased until the end of storage in which the lowest levels were found in P4 treatment, 58.96 % water content and 11.35 % starch. Postharvest diseases found in sweet potato during research were Fusarium rot (P4) and java black rot (P2). In conclusion, underground storage with sand-straw (P1) was selected as the best method to minimize rate of decreasing moisture and starch contents in sweetpotato with the longest storage period estimated of 35 days.</p>

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