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Albany Silica Sandis high purity silica sand with a round shape. This sand can meet a wide range of size requirements from coarse sand to fine sand by the sizing process plant with our original process technology. This sand is recently being spotlighted as the best material sand with super-low iron content for high quality glass fields such as solarnbspContinue Reading...
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2002-3-1 · A process for recovering V and Ni from oil fly ash and for making the ash harmless has been developed. More than 80% of V and Ni are recovered. This process involves two-step leaching and ion exchange. The first step is leaching with water to dissolve Ni, Mg, Al, and Zn, and acid solution is used in the second step to recover V. The metals Ni and V are separated from other metals in each ...
Although the Wohlwill process produces gold of high purity, it requires the producer to keep on hand a substantial inventory of gold mainly for the electrolyte, and this is very costly. Processes based on direct chemical purification and recovery from solution as elemental gold can greatly speed gold processing and virtually eliminate expensive in-process inventories.
Garbanzo Beans or Chickpeas are troublesome for many electric grain mills, the trick is to not allow all the garbanzo beans to enter the feeding tube all at once but one at a time. The video below will show you 2 ways to do this, watch and enjoy freshly ground Garbanzo flour in your home.
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A completely passive solar-powered desalination system developed by researchers at MIT and in China could provide more than 1.5 gallons of fresh drinking water per hour for every square meter of solar collecting area. Such systems could potentially serve off-grid arid coastal areas to provide an efficient, low-cost water source.
The system uses multiple layers of flat solar evaporators and condensers, lined up in a vertical array and topped with transparent aerogel insulation. It is described in a paper appearing today in the journal Energy and Environmental Science, authored by MIT doctoral students Lenan Zhang and Lin Zhao, postdoc Zhenyuan Xu, professor of mechanical engineering and department head Evelyn Wang, and eight others at MIT and at Shanghai Jiao Tong University in China.
is usually adequate land area available for the solar drying system. Some solar technologies like photovoltaic cells and water heaters have become increasingly popular, but solar dryers are less widespread in use and therefore less well understood. This article presents an overview of solar dryer types and their applications.
These dryers can be fired by any conventional fuel system, but there is a remarkable advantage in using a solid fuel system. These solid fuel systems can operate on a number of alternative fuel materials, reducing fuel cost to a fraction of that of conventional fuel not to mention the green energy advantage.
Whenever vapor condenses on a surface, it releases heat in typical condenser systems, that heat is simply lost to the environment. But in this multilayer evaporator the released heat flows to the next evaporating layer, recycling the solar heat and boosting the overall efficiency.
When you condense water, you release energy as heat, Wang says. If you have more than one stage, you can take advantage of that heat.
Adding more layers increases the conversion efficiency for producing potable water, but each layer also adds cost and bulk to the system. The team settled on a 10-stage system for their proof-of-concept device, which was tested on an MIT building rooftop. The system delivered pure water that exceeded city drinking water standards, at a rate of 5.78 liters per square meter about 1.52 gallons per 11 square feet of solar collecting area. This is more than two times as much as the record amount previously produced by any such passive solar-powered desalination system, Wang says.
Theoretically, with more desalination stages and further optimization, such systems could reach overall efficiency levels as high as 700 or 800 percent, Zhang says.
Kalisaya KP401 KaliPAK 384-Watt Hour Portable Solar Generator System The KaliPAK 401 is one of the lightweight yet powerful solar generators from Kalisaya. This model will improve off-the-grid power supply experiences with its reliable solar panel and battery power that can charge an
A system of partial differential equations describing heat and moisture transfer during drying of peeled longan and banana in the solar greenhouse dryer was developed and this system of non-linear ...
4.10. Improved sun-drying and solar drying basic considerations and selected applications. Contents - Previous - Next - D. Adair . INTRODUCTION. The principles underlying improved sun-drying and solar drying are explained in simple terms and attention drawn to the basic questions which the decision-maker must ask when the introduction of these technologies is under considerations.
However, the performance of existing solar food dryers can still be improved upon especially in the aspect of reducing the drying time and probably storage of heat energy within the system. Also, meteorological data should be readily available to users of solar products to ensure maximum efficiency and effectiveness of the system.
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The solar dryer is a relatively simple concept. An importantfeature of solar drying devices is the size of the solar collectors. Depending on the quantity of goods to be dried, collectors must have the capacity to provide sufficient quantities of hot air to the drying chamber. Collectors which are too small in proportion to the amount of food to be dried will result in failed attempts and spoiled food.
There are a variety of solar dryer designs. Principally, solar dryers can be categorized into three groups
Tunnel dryers The structure of a tunnel dryer is relatively simple. The basic design components of a tunnel dryer are the following
Important quality factorsDrying is an important step in the food production process. The main argument for food drying is to preserve the food for longer periods of time. However, it is important to note that the process is not just concerned with the removal of moisture content from the food. Additional quality factors are influenced by the selection of drying conditions and equipment
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The CTCN is the operational arm of the United Nations Framework Convention on Climate Change UNFCCC Technology Mechanism and is hosted by the UN Environment in collaboration with the United Nations Industrial Development Organization UNIDO and 11 independent, regional organizations with expertise in climate technologies.
Preservation of agricultural produce is one of the central problems faced by developing countries. And as time goes on, these problems will be aggravated by the growing dietary needs of the ever increasing population of these countries .1
In many developing countries large quantities of fruits and vegetables spoil due to inadequate infrastructure, insufficient processing capacities, and growing marketing difficulties caused by intensifying competition and protectionism in the worldwide agricultural markets. Up to 70 per cent of agricultural products spoil during the traditional process of open-air drying, especially in tropical and subtropical regions.2 Drying these products can help solve these problems, while also making an important contribution to improving the populations income and supply situation.
Drying is an important form of food preservation that is often carried out at farm level right after harvest, or especially with highly perishable crops, at peak harvest time when local markets are saturated. Drying vegetables, fruits and meat with thermal energy enables longer storage times and easier transportation. Up to 70 per cent of agricultural products spoil during the traditional process of open-air drying, especially in tropical and subtropical regions INNOTECH, 2012.
Agricultural products can be dried open-air or unimproved, directly in the sun, with biomass or in solar dryers.