solar desalination diy

 

So now we come to a realistic assumption. When the vapor pressure equals the pressure pressing down on it can evaporate from the middle. Though it is old, primitive tool, but is still useful for many people. The key to the system’s efficiency lies in the way it uses each of the multiple stages to desalinate the water. Desalination plants have been around for a long time. solar-driven desalination is attractive as a means of conserving fossil fuel resources and limiting the carbon footprint of desalination. It is not only O2 , actully dissolved air. Why does the water stay in the glass? Lincoln Laboratory connects counter–human trafficking community in pursuit of technology to help investigate cases. Portable desalination is the solution to many problems. Actually the system I had in mind was more like this http://www.youtube.com/watch?v=ZZsvGGBVsCc&NR=1but with a few improvements.I like your idea of the pump. the salt content in the chamber increases. It is used to preserve vegetables, fish, meat etc. Economics and driven forces behind . I love this post and thread! Let us look into the design now. But you only need to keep it at room temperature.re. But not enough to vaporize water as our requirement is. Here are two examples of Nicholas's second design for a solar-powered desalination device. The amount of energy required to heat the sea water is reduced at the brine chamber as it is already preheated to a certain amount. For heating purposes, it is more than sufficient, but for desalination, we definitely need the water to vaporize. The simplest unit you can create at home is a solar-powered thermal system. Is it more a "suction" imparted by the flow of stored sea water from 33ft down to sea level again? Of course, key to effective design is energy efficiency. This website is managed by the MIT News Office, part of the MIT Office of Communications. The Solar Cube is a self-contained portable desalination unit that can produce 1000 gallons or about 3500 liters a day. Solar stills are one of the simplest ways of desalination. The entire desalination plant would have to run as a closed system, with the only openings being at the lower end of each of the 3 pipes for this to work. Flash vaporization. Plastic cling wrap seals the top side, and a quarter is used as a weight to make a low point in the center. Solar powered desalination on a large scale. Turn it upside-down and slowly lift it out of the sink. Solar desalination units hold a good deal of promise—especially in disaster relief situations—but what if you find yourself stranded without fresh water somewhere near the sea? I like the Bernoulli pump because there are no moving parts but I'm not sure how efficient it is. So this energy ought to be utilized for something. Solar charge controller, in addition to converting the solar panel output to 12 Volts, also able to charge 12 Volts battery. The researchers plan further experiments to continue to optimize the choice of materials and configurations, and to test the durability of the system under realistic conditions. Massachusetts Institute of Technology77 Massachusetts Avenue, Cambridge, MA, USA, Karl-Lydie Finally, in settings that are remote and “off-the-grid,” a solar-driven desalination system may be more economical than alternatives such as trucked-in water or desalination driven by diesel-generated electricity. Now that I think about it, a vacuum pump would be better for two reasons. Read on.). You only need one vacuum pump to keep it 'clean' of air. But if the temperature rises then the pressure of the vacuum goes up (from say 0.1 atmospheres to 0.11 atm) the the level will drop below the fork and the brine will be trapped. The parabolic trough reflector is probably the best suited for the task, its geomety ensuring focal concentration of solar radiation. The team settled on a 10-stage system for their proof-of-concept device, which was tested on an MIT building rooftop. Second, the vacuum pump could be used to 'refresh' the vacuum as needed. At the other end when the waste and drinking water exit they should be almost at sea water temp. Operates using natural functions and principals found in nature. I am about to change the world on solar water stills, on all accounts like geothermal, passive, solar concentrated stills, and desalination in general. Why does it get heavier the higher you lift it? Solar energy utilization systems such as flat plat solar collectors, evacuated tubes, and solar ponds absorb the solar energy and convert it to thermal energy that drives thermal desalination processes. on Step 5. It uses flat panels to absorb heat and then transfer that heat to a layer of water so that it begins to evaporate. Eg: 10L sea water in, 1L fresh water out and 9L slightly saltier sea water back into the ocean. A credit line must be used when reproducing images; if one is not provided As the chamber pressure reduces, liquid begins to vaporize at a lower temperature. b. “If you have more than one stage, you can take advantage of that heat.”. Sorry I am getting too tired to think. It cannot get better than this. “When you condense water, you release energy as heat,” Wang says. You vacuum cylinder pre-charged with sea water, and closed, with suitable "topup" float valves activating the sea water filling pump. how to: Pour 2 cups of water into a large bowl. You would only need about 25 PSI pump which should be cheaper than a vacuum pump.Then you use a solar collector to heat the salt water and put the fresh water tube in the shade with fins on it. The principle is simple.It has to do with vapor pressure. Such systems could potentially serve off-grid arid coastal areas to provide an efficient, low-cost water source. Then a fresh water loop producing additional vacuum via the venturi effect http://en.wikipedia.org/wiki/Eductor-jet_pump that would draw off the vapor from the now boiling sea water and place this fresh water in the loop. Mix 3 tsp of salt into the water. Solar Cube. I know that 10m of head (about 33ft) = 1 bar or 14PSI in pressure when measured at the base, but are you saying that the opposite, draw, would produce a -1Bar vacuum?Thanks!!! Also, you would need a source of high pressure water, that's definitely not passive. Desalination, or the removal or salt from water, can be used to produce drinkable water from seawater or brackish water. In solar still, saline water is evaporated by solar heat and condensed to become fresh water. To print this project, click on the image and select print in your file menu. any parcical example kindly shear with me.and one other thinking is if we use genrator jacketed water instead of solar then .. 10 years ago You can see demonstrations of this on YouTube.Now, boiling takes energy, no matter how low the pressure is, so you still have to heat it or it will get colder and stop boiling. This means unlimited sustainable water from abundant resources for islands. Adding more layers increases the conversion efficiency for producing potable water, but each layer also adds cost and bulk to the system. It can be simply made out of low-cost common material, such as plastic sheet or bottles. Unlike some desalination systems, there is no accumulation of salt or concentrated brines to be disposed of. What use is saturated brine? Put a collection container in the … I have the perfect conditions to try this: sun, ocean, height and power. (ie. I watched a show about people who treked to the top of Everest and near the top it showed them drinking tea while it was boiling and they said it was barely warm enough to drink. Of course it also has to supply the latent heat of vaporization of water to actually vaporize the water. A portion of the steam can be tapped and fed to a steamer of some kind, or microwaves(some microwaves allow external steam inside). 1. Direct use solar energy to produce distillate directly in the solar collector Requires large land areas and has a relatively low productivity Indirect combining conventional desalination techniques small-scale production due to its relatively low cost and simplicity 7. It can be used on land or boat by designing the system with important features. The solar collector doesn't have to be very big, just enough to raise the temperature a few degrees above the air temperature at the condenser. The heat exchanger should be constructed with two hot sources so that the sea water coming in cools both the fresh water coming out of the system and the brine from the evap chamber. As the vapour travels through the condensor, it expands and cools eventually coming to liquid form. Copper collectors running through the focal point transfer the heat to the brine chamber through a heat transferring medium like Thermic Fluid. If the sea water input is reduced or shut off for some reason, the float value goes down as the liquid level reduces. Solar stills can be used in poverty-stricken areas, in deserts, at sea, and to help reduce energy costs and pollution as stills are environmentally friendly. The top side of the jug has been cut out with a utility knife. In this article, we'll cover: A step-by-step guide on how to make a solar still with simple materials if stranded in an area with no water; The science, purpose, and benefits of a solar still The most important need of the day in the present circumstances is potable water. 4. especially since you can just run the input and output lines bunched together and wrapped with insulation. Desalination, or the removal or salt from water, can be used to produce drinkable water from seawater or brackish water. on what principal is this based?- you propose to produce a vacuum with this height difference. In the direct (distillation) method, a solar collector is coupled with a distilling mechanism. It's mostly oxygen, other gasses dissolved in water wouldn't be any worse problem. Drill a 1/4 inch hole through the top of the lid. We call this boiling.Now, if the pressure pressing down on the liquid is lower then it doesn't need to be as hot to overcome the atmospheric pressure. below, credit the images to "MIT.". To print this project, click on the image and select print in your file menu. So now we come to a realistic assumption. How does it work? The only problem I can see is the dissolved oxygen coming out of solution and contaminating the vacuum, Reply How to Use Your DIY Portable Desalination Unit Put the salt water into the pot (the one with the aluminum foil). New breakthroughs making it possible to supply cities, towns, small communities, villages, farms or homes, dry islands, resorts and alike with out harming nature in any way. That system might soon become available for land-based applications. Little did i know that I had just done what no one else has been able to accomplish until I saw the results. It can be used to manufacture common salt (who can live without it?). That is where thealmost zero energy consumption phrase comes into focus. The direct method of solar desalination involves the use of one large unit which is similar to a still. 0 Comments. This is more than two times as much as the record amount previously produced by any such passive solar-powered desalination system, Wang says. What if you had a DIY solution that meant you could do it yourself? Potassium and calcium compounds can also be obtained. Turning the sea into a fresh water source. How to Build your own Water Desalination System. This means unlimited sustainable water from abundant resources for islands. Read More. A single tap from the collector, thats all. Non green, polluting, expensive fuel. By efficiently harvesting the condensation energy, the overall solar to vapor efficiency is dramatically improved. Think of the pump as suppying the extra energy required to vaporize the liquid. 12:30–14:30 Detailed technical visit to PSA solar desalination facilities (MED plant, MD pilot plants, CSP+D test-bed) 14:30–16:00 Lunch (at Las Eras restaurant in Tabernas) 16:00–17:00 Return to Tryp Indalo hotel Free dinner at the hotel (from 20:00 till 23:00 h) DAY 4 Solar Desalination. MIT News | Massachusetts Institute of Technology. Their demonstration unit was built mostly from inexpensive, readily available materials such as a commercial black solar absorber and paper towels for a capillary wick to carry the water into contact with the solar absorber. Solar desalination Solar desalination is a technique to desalinate water using solar energy. Using the 1/16 inch drill bit, drill a second hole near the rim to let heat escape while soldering. It may not be possible to just use This process of desalination is called distillation. The charge controller will also switch the power from solar panel to battery at night to keep the quipment running. Solar Desalination projects will reduce the LCOW by lowering the LCOH, which will result in more efficient desalination processes and lower overall capital and integration costs for solar-thermal desalination. Solar-Powered Water Desalination Science Project: Build and test a solar-powered device for desalinating water and investigate how the color of the bottom of the device affects its efficiency. Solar desalination units hold a good deal of promise—especially in disaster relief situations—but what if you find yourself stranded without fresh water somewhere near the sea? It would just be nice if there weren't any dissolved gasses at all because then it could be totally maintenance free. The water is basically After thinking about this more I am thinking that maintaining a vacuum while in a boiling condition may be too difficult. If you want something that small then why not just use a greenhouse style desalinater? Desalination with Solar Energy. The heat energy stored in the vapour as it becomes liquid is not wasted and transfered to the sea water. I save the most important for the last, the one thing that most people misunderstand or deliberately ignore. In most other attempts to make passive solar desalination systems, the solar absorber material and the wicking material have been a single component, which requires specialized and expensive materials, Wang says. 10 years ago Scientists are studying ways to use desalination on a global scale, … The sea water input to the chamber can be pre-heated by circulating the sea water through the condenser before piping it to the brine chamber. Solar distillation has been used for thousands of years. 2. They also will work on translating the design of their lab-scale device into a something that would be suitable for use by consumers. 2. “We’ve been able to decouple these two.”, The most expensive component of the prototype is a layer of transparent aerogel used as an insulator at the top of the stack, but the team suggests other less expensive insulators could be used as an alternative. The use of solar energy for desalination can be categorized into direct, where the solar energy is absorbed directly by the saline water (solar pond and solar still), or indirect where the solar energy is absorbed by a solar collector and then transferred to the saline water. I am desperate to make obtain solar powered fresh water and have the conditions: right by the ocean, about 12 Celsius all year round, rocky (not silty) and high ambient temps, about 22C with 300 clear days per year. Other systems could be designed to serve a single household, perhaps using a flat panel on a large shallow tank of seawater that is pumped or carried in. We developed the world’s first solar-powered reverse osmosis without batteries. Vacuum is of course just a lack of pressure. Since the solution cannot dissolve more salt, it starts depositing at the bottom as a residue. Brine is also a common fluid used to transfer heat in large refrigerator installations. How about places where you have to exclusively burn fuel for this process? The two common methods are direct (thermal) and indirect (photovoltaic). This can be tapped off periodically. Early Greek mariners and Persian alchemists produced both freshwater and medicinal distillates. It regulates inflow of sea water and maintains a constant volume in the chamber. http://www.youtube.com/watch?v=ZRZhzX67xHY&feature=related in this video 30in Hg produces a nice boil.As you mention, a small capilary solar water heater (pool type) would produce a few more degrees for a stronger boil. Reply Theoretically, with more desalination stages and further optimization, such systems could reach overall efficiency levels as high as 700 or 800 percent, Zhang says. But when I say it out loud it makes sense, 100 inches of vacuum is a lot and 33' is nearly 400" of vacuum. 5. Citing the recently announced Metito plant in Saudi Arabia, reportedly powered by solar PV, he noted that when night falls, the plant will switch to grid power. You may not alter the images provided, other than to crop them to size. One solution mounts the fresh water collection at sea level (0 feet), which would work when the condenser was installed in the upper vacuum space (www.vacuumdesalination.com), but requires a second pump, and more energy, to return the water where it is to be used (a small tank at about 33ft). Decrease Quantity: Increase Quantity: Add to Wishlist. Since most coastlines are heavily populated the desalination plant could be located inland with 3 pipes running to it, bunch the pipes together and wrap them with insulation. The NEED for EXCELLENT insulation of the entire apparatus. We need a concentrator for that. The sun passes directly through the glass; therefore it has a negligible effect on the heating of the water – so the 35 degree glass incline that some people are talking about has to do with solar collectors – not solar distillers.) No outside power source required other than the sun. So whats new? The hope is that it could ultimately play a role in alleviating water scarcity in parts of the developing world where reliable electricity is scarce but seawater and sunlight are abundant. The sun passes directly through the glass; therefore it has a negligible effect on the heating of the water – so the 35 degree glass incline that some people are talking about has to do with solar collectors – not solar distillers.) For those willing to build a working model of home desalinator.Learn and Earn with fun at www.ewt-world.com There's only one vacuum chamber. Create New Wishlist; My Science Perks members earn at least $0.80 back on this item. In this way, the team’s demonstration device can achieve an overall efficiency of 385 percent in converting the energy of sunlight into the energy of water evaporation. WaterFX on SFGate. If you reduce the atmospheric pressure enough then the water will boil at room temperature. Earthjustice United States of Efficiency Contest, DIY Maglite USB Rechargeable 18650 and LED Upgrade. https://www.homemade-circuits.com/make-your-own-rapid-sea-water I had always thought of this as a municipal sized system. Solar stills can be used in poverty-stricken areas, in deserts, at sea, and to help reduce energy costs and pollution as stills are environmentally friendly. Kytopen is speeding up both discovery and delivery of engineered cell therapies with its transformative Flowfect platforms. In a place like California where inland also means higher elevation then the entire system would run under a natural vacuum due to the weight of the water. Unlimited potable water as a main product and brine, salt and steam as byproducts each of which has many uses. A company in France has developed standalone solar-powered desalination technology that doesn’t require batteries — a world first, they say. If the rest doesn't come to you then I will explain another day.Good night,Gordie. As the vacuum pump operates, the water vapour generated gets sucked by the pump and is pushed into a condenser. (The incline of the glass in a distiller has little to do with solar absorption or angle to the sun. As the heat from the thermic fluid gets transfered to the brine inside, the water temperature rises. 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. Wang emphasizes that the team’s key contribution is a framework for understanding how to optimize such multistage passive systems, which they call thermally localized multistage desalination. The solution? The system uses multiple layers of flat solar evaporators and condensers, lined up in a vertical array and topped with transparent aerogel insulation. You could use a small solar panel powered DC pump to supply it with salt water. If the run is sufficiently long and well enough insulated then by the time the sea water gets to the bioling vessel it should be almost at boiling. One possible configuration would be floating panels on a body of saltwater such as an impoundment pond. It also transfers a lot of heat energy to the condenser. Use a vacuum pump and reduce the pressure inside the chamber. That water gets collected, while the heat from the vapor condensation gets passed to the next layer. Solar thermal desalination plants have several advantages : they require no fuel, generate no air pollution, and needn’t be connected to the power grid. Since we have so conveniently generated steam(it is low pressure steam containing a lot of water), it can be used for steam cooking as well. As you heat a liquid its vapor pressure rises and the rate at which it evaporates goes up. Build a solar-powered water desalination device with materials ready for assembly! Kids magically turn salt water into fresh water with the help of solar energy! Solar stills of this type are described in survival guides, provided in marine survival kits, and employed in many small desalination and distillation plants. These could constantly and passively deliver fresh water through pipes to the shore, as long as the sun shines each day. The brine chamber is a cylindrical, insulated, sealed chamber inside which sea water is stored. However, most solar charge controller available in the market require a battery to be attached to operate properly. 3 years ago, That is a problem. I sure did not know that it would only take 33' of water vacuum to drop the boiling point to ambient. … This increased efficiency will have an overall impact on reducing the cost of produced water.”. Water water everywhere and now we can drink it, yes, from any source. Current Stock: Quantity. At each stage, heat released by the previous stage is harnessed instead of wasted. Solar power? “This new approach is very significant,” says Ravi Prasher, an associate lab director at, Lawrence Berkeley National Laboratory and adjunct professor of mechanical engineering at the University of California at Berkeley, who was not involved in this work. The job of the glass is to trap the heat and provide a slick surface for the condensation to run down. Even a square inch of uninsulated pipe could waste a considerable amount of energy. How about a aspirator vacuum pump circuit powered on the fresh water side? 3 innovative DIY ways to make sea or saltwater drinkable with basic everyday supplies from home. The insulation MUST be extremely efficient. Cut 2 small pieces of solder and wrap them around the tubing on the top and bottom of the lid. We have got water vapour and along with it, a lot of thermal energy in the form of heat and latent heat. Sea water is pumped at high pressure (about 800psi) against a semipermeable membrane. One local man has created a solar-powered desalination device that turns undrinkable water into healthy, fresh H2O. Solution? The system can…