This project goes over the build an off grid survival fridge using a five gallon bucket . It has a peltier cooling module on the top. So no need of refrigerant or ice cubes. The materials you need to build are as follows. A 12V 12A Thermoelectric Peltier Refrigeration Cooling System unit from Amazon, a 5 gallon bucket , 4 gallon Styrofoam liner from Home depot.
This refrigerator works by the principle of peltier effect. The Peltier effect shows that a temperature differential is created when a DC current is applied across two different materials .The peltier unit is made of using two thin ceramic wafers with a series of n and p semiconductor materials sandwiched between them. The ceramic wafers add rigidity and provide the necessary electrical insulation for the module. The n type semiconductors have excess electrons, while the p type have a deficit of electrons with one n and one p making up the junction couple that creates the thermoelectric effect. When a DC current is applied to the circuit, the thermoelectric module can work as a cooler or heater depending on the direction of the current. A thermoelectric cooler or tech transfers heat from one side of the device to the opposite side against the temperature gradient creating a cooling effect.
We use heat sinks and CPU fans on the peltier chips to radiate and lower the heat generated on the hotter side and move the cooler air into the bucket from the cold side. The peltier setup in this build uses two 12V 92mm fans on the hotter side glued to a large 200m X 100mm Aluminum heat sinks, two 12v 5.8amps peltier chips are glued under two 40mm heat sinks using thermal paste. 2 40mm fans are also attached to the heat sink.
The Styrofoam liner is inserted in to the five gallon bucket . Two small rectangular cuts are made on the lid of the liner so that the heat sinks fits inside there and gets good airflow around the edges.
We cut a rectangle on the top lid of the bucket to allow the peltier module to sit in. Small vent holes are drilled on the sides of the lid using a standard quarter inch drill bit so that no hot air gets caught between the bucket lid and the Styrofoam lid.
Cut a small notch in the bucket using tin snips so the wires from the peltier units will come out without getting pinched under the lid.
You can hook this unit to 100 watt solar panels straight , 12 volt deep cycle battery, 12 volt transformer to the wall, or you can use your car CIG lighter. This unit can drop the temperature inside the bucket from 81 to 47 degree Fahrenheit in minutes.
- How to build an Off Grid Hydraulic Ram Pump that uses no electricity to pump water .Water is one of the most important resources you can have and to get water to the highest point in your property, so that you can store it and water your gardens and your animals and your orchards is incredibly valuable. This project goes over the build a water pump that can pump water uphill with no other external source of power except for the water flowing into it. If you have got a piece of land with an abundant source of water like a pond or a creek, a ram pump lets you get that water to a tank or a location at a higher elevation without using no electricity or fuel. A ram pump is essentially two one way check valves, one called the waste valve and the other called the delivery valve. To get it started, you just momentarily open the waste valve to allow water to flow. After that it's working on its own to pump the water uphill above the elevation of the source. The ramp pump works by the principle of water hammer. As the waste valve opens, water flows into the pump and immediately out the valve. But as it picks up speed, the flowing water eventually forces the waste valve to slam shut. Now the water is stopped in the pump, it had kinetic energy, but now it doesn't. That means that kinetic energy was converted into pressure. Slamming a valve shut converts all the kinetic energy nearly instantly, creating a huge spike in pressure which opens the second check valve and forces water entering the pump into the delivery line. An pressure tank is included in the pump to smooth out those sharp spikes and pressure and provide a more even flow rate out of the delivery pipe, reducing wear and tear on the pump components. Here we use a PVC cylinder as the pressure tank. As the delivery pipe is opened, it will allow a constant flow of water as the pressure builds. If you open the valve too quick, this will hold a certain amount of pressure in it so that the pump doesn't stop due to pressure loss. To get the water to the pump somehow from your source, you need to have a tube or pipe. This pipe is a called a drive pipe. This need to have head pressure or drop in elevation. The drive pipe has same size as the waste valve. The more rigid the material, the more efficient your pump will be. You can use steel or PVC pipe or flex tube. To get the water to our desired destination, we are going to have to have something called a delivery pipe. Here we are using garden hose as the delivery pipe. Here are the steps to assemble a one and quarter inch hydraulic ram pump. The parts you need to build this pump are : Six one quarter close pipe nipples - This allows the components to be screwed close together and not have any extra gap between. Two three quarter pipe nipples 2 One and a quarter ball valves 3 quarter threaded union 2 One and a quarter PVC union 2 threaded PVC tees - threaded on all 3 sides A threaded spring check valve - This has a spring on the inside. That allows water to flow through one direction and not the other. A bushing that goes from one and a quarter down to three quarter. A brass or stainless steel swing check valve - This is threaded on both ends. And inside there is a little lever that closes on a swing motion. Teflon pipe tape to make sure things are tightened up and couple of wrenches. The first step in the pump assembly is to take the Teflon tape and put it around these one inch and three quarter pipe nipples. This is done in a clockwise position such that whenever it is time to actually screw components onto this, we want to make sure that they do not unscrew or remove the Teflon tape. This pipe tape will allow the components to screwed together in a more fluid manner. And it helps to create a better seal in the components. Next step is take your one and a quarter ball valve and a pipe nipple and thread that together. Take the one and a quarter union and connect it to the other end of the taped nipples. Connect a tee to this unit with the help of another pipe nipple. Next is attaching a spring check valve to this unit. You need to make sure that the flow is pointing away from the components we just put together. There's an arrow on these that distinguishes the flow direction. Connect another PVC tee to the valve through a nipple. A threaded bushing is going to go on the end of that second tee. On that three quarter bushing, we are going to put one of the three quarter pipe nipples. From that pipe nipple, we are going to put the other three quarter inch union. A three quarter ball valve is connected to this end through another pipe nipple. We connect the swing brass/stainless steel check valve to the first PVC tee with the help of another pipe nipple. When connecting the check valve, make sure that the door or flapper is going to fall open from gravity. So it is going to screw on to this pipe nipple with the door hanging open. The second PVC tee is connected to the pressure tank with another pipe nipple. Make sure that both tees are facing in the same direction. To build the pressure tank for the one and a quarter pump, you need a four inch PVC schedule 40 pipe , four inch coupling, four inch socket to one and a quarter threaded bushing , a four inch cap , bicycle inner tube. Take your angle grinder and cut a 17 inch long pipe from the four inch PVC schedule 40 pipe .Once the pipe section is cut, it's time to assemble the pressure tank. Coat the inside of the coupling with a PVC cement and stick our 17 inch pipe inside .Make sure it is real snug in there . The other side of the coupling is connected to the threaded bushing. Next step is to insert the bike inner tube into the pressure tank .Grab it from the underside and pull it enough that we can attach my pump to it. Start filling the tube with the bicycle pump. Pump until the whole tube seems tight. Put the cap back on the top and seal them tight using pvc cement. The last step is to attach your pressure tank onto this threaded nipple that is connected the second PVC tee on the pump. Next step is installing the ram pump near the water source .This one and quarter inch pump requires around eight gallons per minute to operate. The amount of water that you get at the top is increased as the pump size goes up. So to start the pump, first you need to close the ball valve for the delivery pipe and make sure the ball valve for the drive pipe is opened. You need to just push the waste valve down until all the air inside the drive pipe is out. Water comes down this drive pipe and slams against the check valve to shut it down . It creates a pressure wave that gets shot back up the drive pipe .If the pressure wave finds an air pocket ,then the pump will stop. Start priming the pump by opening the valve manually couple of times until the pump starts to work on its own. After the pump has been running for a minute or two, you're gonna open up your delivery pipe valve out because the pressure tank now has enough pressure in it to push water uphill. https://www.youtube.com/watch?v=K8Fy__ThqpQ
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