fell free to contact me if you have any question. The only commercial model once made is not for sale anymore. HeadakusMaximus | That way you could put it directly above a busy city perhaps. The storage system is similar to that of a concentrated solar power plant (CSP), and the solar concentrators are replaced by heat generating windmills. If there are no commercial units of small permanent magnet eddy current heaters for water or oil heating generation currently available, maybe one or more of "us" Low-tech Magazine readers has the capabilities to build one? Larger heat generating windmills were built in the 1980s. What steam turbine? 3. Some chose the indirect path, converting wind generated electricity into heat using electric heating appliances. 13. In the meantime, if anyone else has more info, feel free to share it. 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. The main point was that there's no way for direct heating to be that much more efficient than using electricity as an intermediate energy form. Two ideas that might be interesting: 1. A heat pump with mechanical input could be run from wind, low-head hydro, a Stirling Engine, or even an electric motor on PV cells. plugged into these to make them greener. Very interested in this concept. The convolutions used (and I'm only guessing here) is that 70% efficiency means 30% loss, and that 90% efficient means 10% loss, so 1/3 the loss is the same as a 3x gain. Too much cheap energy from the fossil fuel for too many years has turned us unable to see these kind of solutions. I am curious about the potential for a hybrid wind turbine (clutchable): Generate electricity during peak hours (high price) Posted by: Of course that's impossible, so what the author wrote is obviously not what he meant. Household items, like computers, washing machines, phones etc., require a 240V AC power supply. 4, 2013, Joules experiment: An historico-critical approach, Marcos Pou Gallo Advisor. [14]. Posted by: It's cheaper than my oil fired neighbours, 100% carbon free and practical for many people to install now. Much simpler, less material (i.e. Comments are moderated and will not appear until approved by the author. OK, now I get your point, you are right. I have no commercial relationship with them other than as a customer. Also, designing some cavitation into the submersed rotor might increase the rate of heating. A gear box could switch between heating and cooling modes. The problem is that almost nobody knows this. The heater requires a specific battery or electricity to ignite the propane and run the fans that blow out the hot air. Great article. The plan is for a passive heater made with soda cans, an old window, and some insulation. plastkupa utomhusbelysning; discord ranking system Posted by: Most turbine manufacturers provide wind energy system packages that include towers. I would say the biggest challenge of direct wind-powered heating system is: the utilisation of this system would be low because of the mismatch between wind power and heat demand profiles. Or maybe even - to add in another low tech concept - it could then double as a barrage balloon defence system in certain cases; a place like Ukraine, for example, could hypothetically generate heat it needs in winter by way of tethered barrage balloons with heat mills attached Posted by: URLs automatically linked. The oil then transferred its heat to the water storage in the tower. We are in Perth in Western Australia. [15]. , Chakirov, Roustiam, and Yuriy Vagapov. Most used simple wooden blades. We are in Perth in Western Australia. But that's because you heat people, not spaces. Posted by: The Wind Heater by Korean designer Jihae Kim presents a sustainable technological heating solution during harsh winters. Also on a larger scale, I think it makes more sense to have heat generating and electricity generating windmills standing alongside each other, rather than combining them into one machine. 7, A much larger water brake windmill (7.5m rotor diameter, 17m tower) was built in 1982 by the Svaneborg brothers, and heated the house of one of them (the other brother opted for a wind turbine and an electric heating system). The average wind speed is not guaranteed either, which means that a heat generating windmill requires heat storage otherwise it would only provide heating when the wind blows. See our Local heating can also be combined with direct heat production, and then you win even more. [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. For example how much more heat do you get when you use ground loops or ground water vs outside air? Prototypes of heat generating windmills, built by Esra L. Sorensen in 1974. 8. Furthermore, the friction liquid in the water brake was not water but hydraulic oil, which can be heated up to much higher temperatures. March 01, 2019 at 07:46 PM. The wind-powered heater can heat water for domestic or industrial purposes directly from wind energy. 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. . 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. I would love to learn more about the feasibility of those mills as heating system for small houses. Very interested in this concept. If in doubt, contact them directly for advice. BEST HARD-WIRED POWERED: Master Flow 1000 CFM Mill Power Roof Mount Attic Fan. It took a long time to heat the water and required good insulation. For even larger systems, energy needs to be transported in the form of electricity, and in that case direct generation of heat with all its benefits becomes unattractive. The simplicity of direct mechanical heat production by wind brake is alluring. September 04, 2019 at 02:07 AM, Intresting article for sure! Does anyone know of a source for where to buy a small permanent magnet eddy current heater for water or oil heating generation? If you need to plug in a computer and mobile phone, the inverter would need a continuous power rating of 150W + 600W = 750W. Essentially one of these: https://en.wikipedia.org/wiki/Heat_pump_and_refrigeration_cycle#Gas_cycle - they're not technically as efficient as a phase change, but if it's simpler and there are fewer moving parts, it might be a win. I think that moving the electric generator inside is the worst of both worlds. Of cause it is not economical to have that much storage. It appears much of the ancillary apparatus could be sourced many places. Final Words. joseph | March 06, 2019 at 11:45 AM. TonyH | The convolutions used (and I'm only guessing here) is that 70% efficiency means 30% loss, and that 90% efficient means 10% loss, so 1/3 the loss is the same as a 3x gain. I corrected the sentence, thanks for pointing it out. The Calorius type 37 which had a rotor diameter of 5 meters and a height of 9 meters produced 3.5 kilowatt of heat at a wind speed of 11 m/s (a strong breeze, Beaufort 6). Renewable energy production is almost entirely aimed at the generation of electricity. February 28, 2019 at 08:59 PM. 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. Local heating can also be combined with direct heat production, and then you win even more. How would it be easily replicable? Water brake windmills don't need steam turbines. The scientists calculate that the maximum distance that is cost-achievable under optimal wind conditions is 50 km. 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? This prevents automated programs from posting comments. Please enable JavaScript if you would like to comment on this blog. In short, the heat generating windmill addresses the main disadvantages of wind power: its low power density, and its intermittency. The study referenced in note 15 contradicts your claims. This is comparable to the heat output of the smallest electric boilers for space heating. May 04, 2019 at 06:52 PM. Directly coupling a mechanical windmill to a mechanical heat pump is cheaper than using a gas boiler or the combination of a wind turbine and an electric heat pump. If you need to plug in a computer and mobile phone, the inverter would need a continuous power rating of 150W + 600W = 750W. [12] However, using similar models for heat production can decrease embodied energy and costs, increass lifetime, and improve efficiency. I'm not a native English speaker and I should have written "as efficient". View an alternate. The writer of the book chapter may know, but he didn't answer my questions. These are comprised of a magnet mounted on a rotating shaft, and can reach temperatures of up to 600 degrees Celsius. Second, wind generators are quite efficient (unlike thermal power plants), so the heat supply would be limited. They can be ordered inour Lulu bookstore. kris de decker | And there's also hot water production for washing and cleaning. Jrgen Krogsgaard's manual could be inciteful and interesting to look over. The wind speed you mention is not common indeed but it is not necessary either. Could be a good opportunity for a smaller manufacturer, though starting a company around this is probably not so straightforward - there must have been a reason why Westrup in Denmark is no longer around. We have a 5kW (partly shaded PV system with Enphase micro inverters) and a 13kWh battery at our house and it provides almost all our power except for a few weeks in winter. Online shopping for Patio, Lawn & Garden from a great selection of Solar Panels, Energy Controllers, Solar & Wind Power Parts & Accessories, Solar & Wind Power Inverters & more at everyday low prices. Could this heat storage via water tank double as a way to store potable water? The scientists calculate that the maximum distance that is cost-achievable under optimal wind conditions is 50 km. The " how to keep a shed warm without electricity " is a guide that tells users how they can heat their sheds without using electricity. "Direct conversion of wind energy into heat using joule machine." The mill was built by Jorgen Andersen in 1975, and stood in Serritslev. @Kris I'm not seeing the contradiction in [15]. If more information is needed maybe we could pool our resources and help one another to gather information for a Proto build. Photo by Claus Nybroe. Well, there is a great problem in that an average wind speed of 11 mps is rare.that is nearly 25mph. I'm wondering if the idea of a heat mill would combine well with a tethered balloon or kite wind system? So I experimented a bit toward creating more concentrated heat at a high temperature. What if We Replace Guns and Bullets with Bows and Arrows? Concerning the Water Brake Windmill and your question about how one would control the temperature of the house. Check Price 35% OFF. Seems like they suffered from mechanical and plumbing trouble, probably related to the fact that the system was basically a semi-prototype. Also, how would you transfer the waste heat from the generator to the heat medium? The SCOP values in table 3 show heat pumps to have ~3x the performance of retarders or boilers (less than I claimed for GSHP, but consistent with figures I've see for air sourced heat pumps). Its heat output was estimated to be 90 kilowatt at a wind speed of 14 m/s (Beaufort 7). Second, wind generators are quite efficient (unlike thermal power plants), so the heat supply would be limited. I don't have the answer but I've sent a mail to some scientists who wrote about the eddy current heater. Would the heat be sufficient to kill pathogens in the water tank for longer-term water storage? Heat storage can solve this issue but it requires the storage capacity to store 'few months' of generation to fully decouple the generation and demand. In a water brake windmill, electric generator, power converters, transformer and gearbox can be excluded, and because of the weight savings, the windmill needs to be less sturdy built. James Joule built it in the 1840s for his famous measurement of the mechanical equivalent of heat: one calorie equals the amount of energy required to raise the temperature of 1 cubic centimeter of water by 1 degree Celsius. December 13, 2021 at 11:30 PM, New paper on heat mills: https://asmedigitalcollection.asme.org/energyresources/article/144/4/040802/1120767/State-of-the-art-of-Windthermal-Turbines-A, Posted by: The Calorius type 37 which had a rotor diameter of 5 meters and a height of 9 meters produced 3.5 kilowatt of heat at a wind speed of 11 m/s (a strong breeze, Beaufort 6). [7], Further into the 1980s, Knud Berthou built the most sophisticated heat generating windmill to date: the LO-FA. The conclusion says that coupling a wind turbine to a heat pump is the most cost effective realization of wind powered heating. Direct heat production thus offers the possibility to save three times more greenhouse gas emissions and fossil fuels using the same number of windmills, which are also cheaper and more sustainable to build. Larger systems present the same rankings the combination of mechanical windmills and mechanical heat pumps is the cheapest option but they have up to three times lower capital costs due to economies of scale. To work out the power rating of your inverter, simply add up the required wattage of all the equipment you'll be using. The heated water can be pumped into a building for heating or washing, and the same concept could be applied to industrial processes in a factory that require relatively low temperatures. Of course that's impossible, so what the author wrote is obviously not what he meant. For example how much more heat do you get when you use ground loops or ground water vs outside air? A heat generating windmill can be combined with a solar boiler, so that both sun and wind can supply direct thermal energy using a smaller water tank. To work out the power rating of your inverter, simply add up the required wattage of all the equipment youll be using. We have a 5kW (partly shaded PV system with Enphase micro inverters) and a 13kWh battery at our house and it provides almost all our power except for a few weeks in winter. , Cao, Karl-Kin, et al. Ian Speer | Kris De Decker | There is much more to win on the demand side than on the supply side, and the habit to heat the whole space of a building can indeed be questioned. March 01, 2019 at 08:07 PM. Because wind speeds increase with height, a small wind turbine is mounted on a tower. A gear box would help, but this adds complexity. The CAPEX values are however much higher for heat pumps, so they don't have the same low tech cool as retarders. A UK based solar system could suffer from a lack of available sunshine, particularly in the winter months. Image provided by the Nordic Folkecenter in Denmark. Here it is: http://www.langdal5.dk/energi/info.html, Posted by: For example, you could build a desk or a bench with water pipes inside, heated by a small mechanical windmill and heat storage. I just wanted to comment in relation to the article and the use of heat pumps. The heated water can be pumped into a building for heating or washing, and the same concept could be applied to industrial processes in a factory that require relatively low temperatures. We show you how with this handy guide covering all the basics. February 28, 2019 at 11:44 AM. Image: the heat generator of a heat generating windmill. Ideas anyone? 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