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- How to build a Homemade DIY Geothermal Heat Exchanger to Cool Your GarageThis project goes over the build of a Geothermal heat pump that takes the hot air in your garage and cool it down by transferring that heat into water .The cold water is pulled out of the ground through a shallow hand dug well and send to a heat exchanger inside the garage . A fan attached to the heat exchanger blows out the cold air into the garage . The heat exchanger absorbs the existing heat inside the garage . The warmed up water is then removed through an exhaust pipe. Just a few feet down the earth is a consistent 55 degrees, summer or winter. Water at that depth is about the same temperature. To harness the cold water down below, we dig a shallow well. To do this we use a post auger and a 3 foot long well point that is attached to a 10 foot three quarter inch pipe using a drive coupling. We start by digging a hole using the post auger till the water table is reached and then start driving using the well point for additional two to three feet until it is submerged under the water table. A two to three foot trench is dug from where the well is installed to the garage . A One inch poly pipe is connected to the well pipe using a barbed coupling and is buried inside the two foot trench all the way to a well jet pump .The trench is dug down at least two feet until you hit some hard pan clay that is about where the temperatures begins being more constant. This keeps the pipe cool under the earth. The other end of the poly pipe coming out from the trench is connected a 1/2 HP Flotec Shallow well jet pump . The pump can be powered by a solar panel. The pump is kept outside the garage as it generates a lot of heat. If it is kept inside the garage, cooling effect from the water will be undone by the heat generated by the pump. The output of the pump is connected to a three quarter inch copper pipe inside the garage. It is then further connected to a water pressure tank with the help of a brass tee and a union. A relief valve is also attached to the tee to empty the water tank if the pressure gets too high. A water pressure tank is used prevent the pump from failure .It also acts as a buffer storage. The other end of the brass tee is connected to two pipes. One pipe goes outside the garage to a faucet and the other pipe is connected to a radiator that acts as a finned tube heat exchanger. The heat exchanger captures the hot air surrounding the garage and stores the heat into the finned coils within the radiator .The heat is transferred to the water flowing through them . An exhaust line from the radiator carries this hot water to outside the garage. Two flexible hose pipes connects the input of the heat exchanger to the water tank and output to an exhaust pipe. A box fan is placed in the front of the radiator to blow the cool air . The fan can be powered by Solar panels. Once the water starts running through the radiator , we start the fan https://www.youtube.com/watch?v=IRLLbmcnYjA https://www.youtube.com/watch?v=bCOeMIQLwgc
- DIY Video:How to build an awesome Roof Top Portable ABS Pipe Hot Water Heater/Shower . Great for Camping/ OutdoorsThis project goes into the build of a DIY solar powered pressurized roof top water heater and shower that is portable for outdoor survival and camping trips. This project is easy to make and requires only minimal tools and plumbing parts. The dimension of the pipe used for this build is six feet tall and four inch wide. This has a capacity of 15 liters. The materials you need to build this project are six feet long four inch ABS pipe, air compressor, two four inch PVC end caps, abs cement, rubber schrader valve, shutdown valve and retainer nut, radiator valve drain plug , forstner bit,two inch threaded end cap, high heat flat black paint, steel wool scrubber, methyl hydrate. The shutoff valve is installed as low as possible in the pipe to avoid the necessity of having to tilt the system. Mark the position for the valve keeping the retainer nut in place , we insert a forstner bit into the nut creating a center mark for the drill .Once the hole is drilled ,we thread the shut off valve into place and attach the retaining nut. For installing air compressor for pressurizing the tank ,we use an long schrader valve that is used for aluminum rim tyres. This valve uses threaded nuts to secure it in place . Next step is to install the water intake opening. For this we use a two inch PVC threaded adapter socket . We take the diameter of the fitting and then drill out the opening and glue the fitting in place using ABS solvent cement. A radiator valve drain plug is installed on the threaded end cap of the water intake PVC fitting .This valve helps to release extra pressure from the tank without opening the main drain shut off. In order to improve thermal absorption of solar energy, the surface of the ABS pipe is painted with flat black paint. The surface is polished with steel wool soaked in methyl hydrate and applied one coat of spray primer followed by two coats of high heat restoleum black paint. To mount the shower to roof of the car or truck , we use a canoe foam block . We extend the slots in the foam block to make them fit inside the cross rails . An arc is cut on the foam block equal to the outside diameter of the pipe and positioned it such that it left half an inch of foam between the mounting slot and the bottom of the arc. To attach the shower to the support pads, here we use one inch nylon tie down straps. With both these pads in place, the water heater is securely attached to the roof. An inexpensive 25 foot long coiled three eighths inch hose from the local garden center is used as the shower hose. This would be perfect as it is easily stored and can be taken apart after use. The air compressor is connected to the pipe with the help of a multifunction spray nozzle . Thee bursting point of six inch ABS pipe is well over 100 psi .So a 30 psi would provide safe and ample pressurized shower without any long term expansion fatigue to the pipe or glue connections . https://www.youtube.com/watch?v=dG2HK9JsAjw
- How to Heat your Home or Garage for Free by building Solar Air Heating Collectors that uses no electricity or batteriesSolar heat collectors are a good supplemental heating source that can provide homeowners with free heat for their home when the sun is shining. Solar collectors are a box like structure that capture the energy from the sun and convert it into usable energy for heating purposes. Inside the collector solar energy is simply converted into usable thermal energy. On the front side of the solar collectors . a clear panel or glazing material typically polycarbonate sheeting, single pane glass ,double pane glass face towards the sun and allow the sunlight into the collector box. On the inside of the collector box is a heat exchanger or a absorber. The heat exchanger or absorber is responsible for transferring the heat of the sun into a usable thermal heat source. The heat exchanger is suspended or attached inside the collector box and should be coated flat black with a high heat temperature resistant paint. The flat black paint helps to absorb the heat energy from the sun. It is very important to utilize a flat finish black paint inside the collector box. If the paint has a reflective coating, it will reflect the sun back outside of the collector, which results in lost potential energy. It assists with the entrapment of that heat energy rather than reflecting it away from the collector. Once the sunlight has penetrated the collector box through the glazing, the heat exchanger material and the flat black paint will absorb that heat and begin to warm the air inside the collector. As the air inside the collector and around the absorber warms, it will expand and rise. The expansion of warm air will naturally create a convection current. As the air inside the collector rises, it will continue to pick up heat through friction with the absorber. The air passing over and through the absorber is given more opportunity to gain heat by rubbing against that surface which is being heated by the sun. Now that the air is warm and picking up heat and needs a way to move through the collector box, we install two vents on the backside of the solar collector facing towards the room or space that we want to heat. Through the vent at the top of the collector, the heated air moves into the home , the vent at the bottom allows the cooler air to return back to the the collector. Having a return event at the bottom and a supplier event at the top of the solar collector allows natural convection process. The air inside the collector is picking up heat from the absorber and is naturally wanting to rise up and out of the collector. A natural force of air rising will induce a convection current, which will pull cooler return air from the room or condition space into the bottom of the collector box. The collector creates a convection current inside the room .It removes cooler dense air from the bottom of the room and takes it through the collector where it is warm, and then exhausts the heated air out of the supply duct back into the room. This project goes over the build of an entirely self contained Solar Air Heater using no grid power whatsoever. The unit draws the cold air from the room and exhausts hot air into the room using a 2 5V DC brushless 7 vane case fans. This fans are powered by a 16 Watt Amorphous solar panel. Both the intake and exhaust pipes ore of 5 inch diameter. 9 rows of 17 soda pop cans , a total of 153 355ml soda cans are used for the collector. The aluminum pop cans are painted with a flat black paint to ensure all sunlight is absorbed and not reflected. Also there is a five inch intake and exhaust manifold at the bottom and top of the unit. This ensures that all air travels through the interior of the aluminum cans. To maximize the heat transfer from the sun to air within a given space, we need to build a better heat exchanger. Solar air heating systems use air as the working fluid for absorbing and transferring solar energy. Transferring heat from one place to another by definition is a heat exchanger. When the sun heats the metal, the hot metal heats the air circulating over the metal of the heat exchanger. The job is to capture radiation from the sun and transfer this thermal energy to air via conduction heat transfer. Heat transfer output depends on the rise in temperature and the airflow. In order to minimize heat loss through the plexiglass , we keep the absorber temperature as low as usually possible. The cooler the absorber runs, the less heat will be lost out of the glass. A way to keep the absorber cooler while extracting the same amount of energy from the sun is to increase the airflow. To improve conduction heat transfer without significantly reducing airflow , we disturb the airflow within the solar air tubes . Four holes are put in some of the soda cans to create a baffle that increase the turbulence .These baffle cans are placed evenly across the tubes to distribute the airflow. We place the first baffle cans on the second row from the bottom with the intention of disturbing the airflow early. The second baffle will be located in the 10th can . In order to stack the empty cans, we make an assembly tray "V" shaped support structure using leftover baseboard. The cans are glued together using PL Premium construction adhesive that is water resistant, non shrinking and paintable. The soda cans are positioned on the loading tray and slowly rotated to evenly distribute the construction adhesive. The "V" channel made from baseboards holds the cans perfectly straight. The box for the Solar air heater is made of 5052 aluminum alloy sheets. The dimension of the box are 91 inches tall and 24 inches wide. We use a one inch flange and a metal bending brake to bend the aluminum to make the sides of the box. The top and bottom caps are bend to fit on the top and bottom of the box . When manufacturing the bottom caps, the distance between the bends is decreased by one millimeter to allow the caps to fit inside the solar air box to facilitate drainage. Next step is securing the aluminum box top and bottom .The procedure involves using a smaller diameter drill bit as a pilot and then drilling to final size for the rivet only after the two pieces are mated together. The pieces being held together via cleco fasteners. The function of the cleco is to temporarily hold material in the exact position during the manufacturing process. Two five inches holes are cut at both top and bottom on the box to install the plenums. The intake and the exhaust pipes for the two solar air heaters are manufactured from a single piece of five inch HVAC plenum. These are inserted and secured into the holes using construction adhesive. The back of the box is insulated using two sheets of half inch foam sheet. One sheet of half inch foam is installed on the sides. A pneumatic air file is used to cut the sheets. We install a snap action thermostat in the interior of the exhaust manifold, constantly monitoring the temperature of the air being brought into the dwelling. The intake and exhaust manifolds need to ensure that all air travel through the interior of the cans therefore it is important to have a good seal to each can. This also means that the manifold itself needs to seal well against the interior of the heat box. Nine holes are cut on a two sheets of half inch plywood to make the intake and the exhaust manifolds. These manifolds are secured in place against the cans using PL construction adhesives. The solar air tubes are held tight inside the box using two 1/16th half inch 6063 aluminum extrudes. These lightly applying pressure on the cans holding them firmly against the back of the heat chamber. Three separate coats of high heat black rest-o-leum paint are applied to the box , all within 60 minutes of each other. Clear silicon adhesive will be the primary method of adhering the Plexiglas to the solar air heater. After precisely positioning the glass on top of the heat chamber, I used a 1/8 inch pilot drill to go through the plexiglass. One full tube of silicone is used around the perimeter prior to laying the glass down. We install 2 16 Watt Sailflo Duct Exhaust fans with a capacity of moving 141 CFM (Cubic Feet per Minute) for air . These are powered by a small solar panel. One blowing air into the chamber and one sucking air out. This helps to overcome the additional internal airflow resistance built into the design. The completed solar air collector is installed outside facing south to maximize the exposure to the sun. Once the solar air collector is installed outside , we take the temperature rise between the incoming and outgoing air while moving 141 cubic feet of air per minute from the fans . The calculate the amount of heat transfer we multiply the CFM and Temperature rise with a factor of 1.08. https://www.youtube.com/playlist?list=PL6YanwREcLx7h747VhKjJLClqvBmy5cF5