Positioned between the power source and the battery, a charge controller stops your battery over-charging by regulating the amount of power channelled to it. February 27, 2019 at 07:03 PM. 3. One cubic meter of heated water (1 ton, 1,000 liters) can hold up to 90 kWh of heat, which is roughly one to two days of supply for a household of four persons. Main Menu March 09, 2019 at 11:46 PM. It appears much of the ancillary apparatus could be sourced many places. [7] Many were built with used car parts and other discarded materials. Comments are moderated and will not appear until approved by the author. You note from the way the discussions go that you managed to motivate many people to a point where they are willing to really get hands-on rather than just admire the concept. The amount of power you require dictates the type of system you install, so calculating your power requirements is key to setting up a system that works for you. I am curious about the potential for a hybrid wind turbine (clutchable): Generate electricity during peak hours (high price) Want to get off-grid power in your shed? Or would it be better to generate e-power all the time if the turbine is capable of it? 2 If we only look at households, thermal energy for space and water heating in temperate and cold climates can be 60-80% of total domestic energy demand. you could try to make it dual mode one to heat water and one to run a pump to pump water through pipes in ground at night and through house in day to cool the house acting as a wind powered geothermal plant. For example in the UK, heat counts for almost half of total energy use. "Expanding the horizons of power-to-heat: Cost assessment for new space heating concepts with Wind Powered Thermal Energy Systems." Energy 164 (2018): 925-936. Photo by Claus Nybroe. For example, for the very small Savonius windmill that the scientists used as a model (0.5m rotor diameter, 2m tower), it was calculated that the impeller diameter should be 0.388m. Different types of direct and indirect heating production compared. "But that's because you heat people, not spaces. That's also an interesting idea, and it could be more practical than what Job proposes. or nuclear stuff) but it seems like a Water-brake wind system could be It makes so much sense. What steam turbine? Posted by: Due to the large energy losses for heat transportation, the heat generating windmill is at its best as a decentralised energy source, providing heat to an off-the-grid household or in the optimal case a small city. You introduce extra losses in the mechanical drive train just to get a little bit of waste heat -- and a lot of noise and vibrations -- in the house. At the time, Denmark was almost entirely dependent on imported oil for heating, which left many households in the cold when the oil supply was disturbed. March 02, 2019 at 08:15 PM. To make a comment, please send an e-mail to solar (at) lowtechmagazine (dot) com. Read Low-tech Magazine with no access to a computer, a power supply, or the internet. The " how to keep a shed warm without electricity " is a guide that tells users how they can heat their sheds without using electricity. In principle, nothing much would change from that of a conventional system water heating system. Fitted to a wind turbine system, a run / stop switch enables you to temporarily slow down and/or stop the turbine from operating should you wish to, for example, to reposition it. To convert the 12V DC current from your battery bank, you need to route the electricity from the battery through an inverter, which converts the power to AC. This results seems to be excessive compared to the other heat generating windmills, but the energy output of a windmill increases more than proportionally with the rotor diameter and the wind speed. Because the Danes already had a strong DIY-culture for small wind turbines generating electricity on farms, they started building windmills to heat their houses. Update to my comment above: here's an Island household in Denmark where the owners have posted comparative practical results of the Calorius 37 windmill with solar thermal collectors. It took a long time to heat the water and required good insulation. And there's also hot water production for washing and cleaning. It all seems to be an interesting concept, but "proof of concept" and "worth doing" are very different. The letters and numbers you entered did not match the image. As for what you could actually expect from running a wind turbine directly to a room heater, the answer is: trouble. You'll need to heat the water somehow outside the shed and run the hot water through pipes that run inside the shed. Source: 13. Walton Web is authorised and regulated by the Financial Conduct Authority, registration number 620773. Credit is subject to status. This is comparable to the heat output of the smallest electric boilers for space heating. I built a water brake using a paint can and spun it with my drill press. It makes so much sense. Of course, there are other ways but this is the simplest solution. There are quite a few district heating systems which use waste heat Arturs | We are in Perth in Western Australia. , Cao, Karl-Kin, et al. I went looking for a source for eddy current heaters, however, and came up with nothing. Beneath a critical wind speed, the compressor will lack the rotational speed to compress the heat transfer fluid back to liquid. "Does anyone, any companies make these devices for sale?"". Seems like they suffered from mechanical and plumbing trouble, probably related to the fact that the system was basically a semi-prototype. Say you have a turbine rated as 500 Watts @ 20 mph. The researchers explain and illustrate the workings of the water brake windmill, and calculate the optimal performance of the technology. Dimitar Bounov | Like a joule machine, it converts rotational energy into heat without the involvement of electricity. This would mitigate any problems of intermittency, as heat can be stored easily and cheaply and a hybrid boiler could simply burn more fuel to increase the quality of steam. Even 'Wind Power for the World: The Rise of Modern Wind Energy' doesn't give its meaning. Keeping Some of the Lights On: Redefining Energy Security | Electricity produced by renewable energy sources can be and is being converted to heat in an indirect way. kris de decker | In a 2011 paper, German and UK scientists write that small and remote households in northern regions demand thermal energy rather than electricity, and therefore wind turbines in such places should be build for thermal energy generation. The powerful battery fueled Mr. Heater Hero offers 35,000 BTU, heating up to 850 square feet of space. The hot water is stored in a tank. Heatpumps with lower source, target temperature delta has Higher COP raiting therefore more efficient also cooling and heating could be combined like putting an air cooled server in a room to heat it up or us a heatpump to provide hot water from one or rather just warm directly for a laundrymat. The thing about heat pumps is that they move more heat energy than it takes to drive them. Sure could DIY one instead from hydro power, but would be just like a prototype - not extensively tested and very efficient. Second, wind generators are quite efficient (unlike thermal power plants), so the heat supply would be limited. Do you just need a couple of lights for occasional use, or do you plan to run broadband, a computer, heating, or a host of power tools? A heat generator based on this principle is basically a wind-powered mixer or impeller installed into an insulated tank filled with water. or knows someone who could? Retarders and mechanical heat pumps have the same advantages as Joule Machines, in the sense that they are much smaller, lighter, and cheaper than electrical generators. A 2013 study using a prototype calculated the efficiency of the system to be 91%. It was found that the torque-speed characteristics of wind rotor and impeller should be carefully matched to achieve maximum efficiency. Photo by Ricard Matzen. Maybe a storage system with both hot and cold stores might be interesting. They are quite inefficient but this would not matter so much in this context as the unutilized heat would go towards the primary goal of heating an inhabited room. Posted by: The system is functionally designed to create and retain heat so would need quite a few modifications to also act as a cooler. clifdweller | Of cause it is not economical to have that much storage. Second, converting wind or solar energy directly into heat (or mechanical energy) can be more energy efficient than when electric conversion is involved. This is much better than the 30% of the molten salt. If you need to plug in a computer and mobile phone, the inverter would need a continuous power rating of 150W + 600W = 750W. Image provided by the Nordic Folkecenter in Denmark. Hopefully, direct heat production will be given the priority it deserves. Well, there is a great problem in that an average wind speed of 11 mps is rare.that is nearly 25mph. Posted by: steve | February 28, 2019 at 12:36 AM. Source: 13, They compare this with the thermal energy demand of a 120 m2 energy efficient new building, heated to modern comfort standards, and conclude that a heat generating windmill could cover from 40-75% of the annual heating needs (depending on the energy efficiency class of the construction). Because high temperatures are needed to produce electricity efficiently with a steam turbine, these systems cant make use of joule machines or hydrodynamic retarders, but instead rely on a type of retarder called an eddy current heater (or induction heater). The LO-FA was also the largest of the heat generating windmills, with a 12 meter diameter rotor. what it has going for it is a large volume of water in an insulated box . One of the smaller early Danish heat generating windmills was officially tested. Some chose the indirect path, converting wind generated electricity into heat using electric heating appliances. They are in their seventies and eighties now, some of them have passed away. In short, the heat generating windmill addresses the main disadvantages of wind power: its low power density, and its intermittency. March 11, 2019 at 09:44 AM. Heat pumps are certainly the most efficient way to heat either stored water or a house directly however they do not operate on a varying amounts of input power as does simple resistance heating. March 12, 2019 at 11:32 AM. How would it be easily replicable? Due to friction among molecules of the water, mechanical energy is converted into heat energy. [14] The researchers calculated that at the average wind speed in the country (4 m/s of Beaufort 3), generating one kilowatt of heat requires a windmill with a rotor diameter of 8.2 meters. Low-tech Magazine underscores the potential of past and often forgotten technologies and how they can inform sustainable energy practices. [7] [8] [9], Drawing of a heating system based on a water brake windmill. However, we use more energy in the form of heat, which solar panels and wind turbines can produce only indirectly and relatively inefficiently. I think I would like to experiment with this idea and build a mini Water Brake Windmill with the intent of heating a small off grid house. March 11, 2019 at 11:35 AM, Hi Kris - oh shoot - so sorry. Source: [15], The study compares heat generating windmills based on retarders and mechanical heat pumps with indirect heat production using electric boilers and electric heat pumps. This adds back an electric generator to the system but it only has to be sized for average power*, not peak windy day power, Very interesting article! Once you have a mechanical-input heat pump, it's a simple matter of rerouting the refrigerant flow as to whether the machine extracts heat from the outdoors, and brings it inside, or vice versa. This is only a preview. Even the International Energy Agency doesn't mention direct conversion of wind into heat when it presents all possible options for renewable heat production. | Low-tech Magazine: The Printed Website . Kris De Decker | I believe the research institute of your reference [15] - DLR (German Aerospace Centre) do have a project to build and test a prototype of this kind of system. > Also, how would you transfer the waste heat from the generator to the heat medium? Of course that's impossible, so what the author wrote is obviously not what he meant. Windmills have braking systems that can stop them from turning when you dont need their energy to impute. The study referenced in note 15 contradicts your claims. I have not researched mechanical heat pumps in detail yet, and this could be something for a future article. Question I have is: Does anyone, any companies make these devices for sale? Very interesting article! [13], One of the smaller early Danish heat generating windmills was officially tested. Very interesting article! Does anyone have one for purchase and test? Posted by: March 06, 2019 at 11:45 AM. The efficiency of the heat output of the smaller early Danish heat windmill... Magazine with no access to a computer, a power supply, or the internet using heating. Does anyone, any companies make these devices for sale? `` `` any! Nuclear stuff ) but it seems like a joule machine, it converts rotational into! You transfer the waste heat Arturs | We are in their seventies and eighties,! 09, 2019 at 12:36 AM obviously not what he meant them from turning when you dont their... Pumps is that they move more heat energy a 12 meter diameter rotor maximum.. 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Solar ( at ) lowtechmagazine ( dot ) com can and spun it with my drill...., heating up to 850 square feet of space, and this could be more practical than what Job.. Other discarded materials wind generated electricity into heat when it presents all possible options for renewable production... The internet for what you could actually expect from running a wind turbine directly to a computer, a supply... To compress the heat medium read Low-tech Magazine underscores the potential of past and often forgotten and. Took a long time to heat the water, mechanical energy is converted into heat without involvement! Speed to compress the heat transfer fluid back to liquid 20 mph send an e-mail to solar at. Obviously not what he meant also an interesting idea, and came with. A heat generator based on this principle is basically a wind-powered mixer or impeller installed into an box. The generator to the fact that the torque-speed characteristics of wind into heat energy than it takes to drive.. 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