We looked carefully at direct water heating via the actual PV panels and found there are two manufacturers (one French and the other Turkish) but they only seem to be effective at lower temperatures such as pool heating plus we have long very hot summers and solar water heaters tend to spend summers venting hot water to avoid overheating in any case. 48 hours and Saturday delivery not available on all buildings. As for what you could actually expect from running a wind turbine directly to a room heater, the answer is: trouble. 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). Create hole for intake and exhaust hoses. . The conclusion says that coupling a wind turbine to a heat pump is the most cost effective realization of wind powered heating. The hot water is stored in a tank. Not sure about your approach though. Household items, like computers, washing machines, phones etc., require a 240V AC power supply. You can install a bank of more than one battery to increase the available power store. Then they're insulated and placed under the window. I went looking for a source for eddy current heaters, however, and came up with nothing. Heat generating windmills are also investigated for renewable electricity production, mainly because they offer a better solution for energy storage compared to batteries or other common technologies. The hot water is stored in a tank. The wind-powered heater can heat water for domestic or industrial purposes directly from wind energy. steve | To make a comment, please send an e-mail to solar (at) lowtechmagazine (dot) com. ), (Name is required. ", (note: 3x AS efficient is not the same as 3x MORE efficient). The study referenced in note 15 contradicts your claims. Having your electric heater powered by a wind turbine also allows for the energy to be stored for when you need it, so you won't run out of your power source when you need it the most during those cold winter months. or knows someone who could? 1. No way it's 300% as efficient, but without the source data, there's no way for the reader (or obviously the writer) to calculate. Source: 13. 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. Source: [8], The Joule Machine was originally conceived as a measuring apparatus. Read Low-tech Magazine with no access to a computer, a power supply, or the internet. Mario Stoltz | Storing the high heat underground in rocks seems like a cheap option. Davide Honey | clifdweller | February 27, 2019 at 07:03 PM. This is saying that direct wind to heat would then be 280% efficient. What are you waiting for? In other models, heat generation happened at the bottom of the tower from the top of the windmill there was a shaft down to the bottom where the water brake was installed. Please enable JavaScript if you would like to comment on this blog. The heat storage tank of a water brake windmill works like any other heating boiler. Kris De Decker | I corrected the sentence, thanks for pointing it out. According toWhich, while micro roof-mounted wind turbines are cheaper, theyre also less efficient and will produce a lot less electricity than pole-mounted ones. No idea what "LO-FA" stands for. Obviously a water brake windmill is suited for a windy climate. There are plenty of options to choose from the key is to make sure that the kit you buy matches your power needs now and in the future. The windmill, which had three fiberglass blades, produced up to 8 kilowatt of heat according to non-official measurements comparable to the heat output of an electric boiler for a modest home. Drawing of the heat generator of a heat generating windmill. The wind speed you mention is not common indeed but it is not necessary either. Email address will not be displayed with the comment.). That and a 5 meter (16+ ft) diameter rotor You will have a difficult time finding a location that reliably supplies the required wind speed and has space for a largish (and noisy) turbine. February 28, 2019 at 12:27 AM, "This old-fashioned approach remains relevant, also in combination with new technology, because it would be three times more energy efficient compared to first converting the energy to electricity, and then back to rotational energy.". I wonder how practical a windmill brake heater would be if you replaced the steam turbine with a stirling engine? One of these builders, Jrgen Krogsgaard, wrote a manual in the 1970s and I have asked him if it could be published. Panels fitted to a roof can be neat and unobtrusive, unlike the more obvious presence of a wind turbine. Say you have a turbine rated as 500 Watts @ 20 mph. This adds back an electric generator to the system but it only has to be sized for average power*, not peak windy day power, Much less known is that a mechanical windmill can do the same in a windy climate -- by oversizing its brake system, a windmill can generate lots of direct heat through friction. It was found that the torque-speed characteristics of wind rotor and impeller should be carefully matched to achieve maximum efficiency. How would it be easily replicable? This involves one less energy conversion, which makes the combination at least 10% more energy efficient than an electric heat pump driven by a wind turbine. URLs automatically linked. Even the International Energy Agency doesn't mention direct conversion of wind into heat when it presents all possible options for renewable heat production. The Joule Machine has lower weight, smaller size, and lower costs than an electrical generator. February 27, 2019 at 07:40 PM. Posted by: Having trouble reading this image? [15]. 1 In temperate or cold climates, the share of thermal energy is even higher. With it though, how would one control the temperature of the house? A heat generating windmill can also be combined with a solar boiler, so that both sun and wind can supply direct thermal energy using a smaller water tank. This would be dependent on a total volume large enough to absorb the whole days worth of heat or dual pump water into house then through ground pipes to recool it. I'll keep you updated here in the comments section. I corrected the sentence, thanks for pointing it out. Sure could DIY one instead from hydro power, but would be just like a prototype - not extensively tested and very efficient. would go towards the primary goal of heating an inhabited room. February 28, 2019 at 06:18 AM. In general, the higher the tower, the more power the wind system can produce. The problem is that almost nobody knows this. 7, Further into the 1980s, Knud Berthou built the most sophisticated heat generating windmill to date: the LO-FA. If you also want renewable electricity, you could use solar PV or a second windmill instead of trying to fit everything into one machine. It appears much of the ancillary apparatus could be sourced many places. Source: [7], Providing enough storage to bridge a week without wind thus requires up to 7 tonnes of water, which corresponds to a volume of 7 cubic meters plus insulation. It features 1260Wh of capacity, enough to run power tools, including a circular saw, electric hammer drill, or bench grinder. Very interested in this concept. Publicat de Universitatea Tehnic Gheorghe Asachi din Iai Tomul LIX (LXIII), Fasc. Radiators are usually controlled by temperature thermostats preset to the desired temperature for each room. March 12, 2019 at 11:32 AM. The letters and numbers you entered did not match the image. Photo by Claus Nybroe. As the winter approaches each year, many people worry about how they are going to be able to afford gas or . Kris De Decker | The average cost of a small roof-mounted turbine (between 0.5 kW to 2.5 kW), is about 2,000 5. Its heat output was estimated to be 90 kilowatt at a wind speed of 14 m/s (Beaufort 7). February 28, 2019 at 02:39 PM. 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). But if you want AC power for tools or charging batteries, you'll need to spend more than $3,000 for a high-end system. Sorry for the silly question! Tests have shown that small wind turbines producing electricity are very inefficient and dont always generate as much energy as was needed to produce them. Despite a warming climate, the demand for thermal energy is as high as ever. If in doubt, contact them directly for advice. Electricity produced by renewable energy sources can be and is being converted to heat in an indirect way. Well, there is a great problem in that an average wind speed of 11 mps is rare.that is nearly 25mph. For example, you could build a desk or a bench with water pipes inside, heated by a small mechanical windmill and heat storage. Or is it just controlling the flow rate of the water? February 27, 2019 at 08:02 PM. YOUR SHED, YOUR WAY. Direct heat production is cheaper, can be more energy efficient, and is more sustainable than indirect heat production. 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. As the stirring rods are lowered into the BBs, the resistance rises very quickly. 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. *maybe buffered by an hour or two of battery back-up to allow some flexibility, Posted by: plugged into these to make them greener. How would the economics or environmental considerations be affected if you were to move a lightweight windmill during the course of the year, in order to have windmill spend most of its time where the wind is blowing or the climate is cold? What steam turbine? In terms of using wind-driven mechanical heat pumps to produce heat. , The Rise of Modern Wind Energy: Wind Power for the World. Davide Honey | Parasene. 3, In spite of this, renewable energy sources play a negligible role in heat production. One could integrate stored wind generated heat into a steam generation cycle. Here it is: http://www.langdal5.dk/energi/info.html. Images from "Test at very high wind speed of a windmill controlled by a water brake", O. Helgason and A.S. Sigurdson, Science Institute, University of Iceland. Larger heat generating windmills were built in the 1980s. The researchers explain and illustrate the workings of the water brake windmill, and calculate the optimal performance of the technology. March 02, 2019 at 12:41 AM. Your comment could not be posted. Obviously not everyone has space for a heat generating windmill, but there's no need to put a windmill next to each house. Image provided by the Nordic Folkecenter in Denmark. 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. Fourth International Conference on Environmental and Computer Science (ICECS 2011), Singapore, Sept. 2011. solar [at] lowtechmagazine [dot] com, This is a solar-powered website, which means it sometimes goes offline, more energy efficient compared to first converting the energy to electricity, and then back to rotational energy, very inefficient and dont always generate as much energy as was needed to produce them, when solar thermal is used for power production, WIND POWERED THERMAL ENERGY SYSTEMS (WTES), Integration of Thermal Energy Storage into Energy Network, The bright future of solar thermal powered factories, Direct conversion of wind energy into heat using joule machine, SMALL WIND ENERGY SYSTEM WITH PERMANENT MAGNET EDDY CURRENT HEATER, Joules experiment: An historico-critical approach, Concept study of wind power utilizing direct thermal energy conversion and thermal energy storage, Real-world tests of small wind turbines in Netherlands and the UK, Usage of the Wind Energy for Heating of the Energy-Efficient Buildings: Analysis of Possibilities, Expanding the horizons of power-to-heat: Cost assessment for new space heating concepts with Wind Powered Thermal Energy Systems, Keeping Some of the Lights On: Redefining Energy Security. Arturs | 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. Posted by: The Danish water brake windmill from the 1970s was a relatively small machine, with a rotor diameter of around 6 meters and a height of around 12 meters. The problem is that almost nobody knows this. some electricity for low current devices? Choosing a selection results in a full page refresh. Second, converting wind or solar energy directly into heat (or mechanical energy) can be more energy efficient than when electric conversion is involved. Another model could be to run an air compressor from the turbine. Murray Read | Solar thermal energy can be used for water heating, space heating or industrial processes, and this is 2-3 times as energy efficient compared to following the indirect path involving electricity conversion. Posted by: No reviews. I'm not a native English speaker and I should have written "as efficient". Ideas anyone? If you only need hot water for washing in an off-grid household then maybe it could be more interesting to combine. February 27, 2019 at 06:28 PM. Mario Stoltz | So, let's say wind -> electric -> heat gives an overall efficiency of 70%. 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. [1], One type of heat generating windmill converts rotational energy directly into heat by generating friction in water, using a so-called water brake or Joule Machine. Efficiency = (work output) / (work input), "it would be three times more energy efficient compared to first converting the energy to electricity, and then back to rotational energy. 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. Interesting to see in this case how industrially manufactured systems for energy generation and conversion are oriented so much around the "generally accepted" energy transfer media (mostly electricity of course) that it becomes rather hard for DIYers to get started. However, solar and wind energy can also be used in a direct way, without converting them to electricity first and of course the same applies to biomass. March 03, 2019 at 01:04 PM. 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. It would suck in cold air from the rest of the room, and dump its waste heat under the desk, turning into a "free" foot heater. I'll keep you updated here in the comments section. Company registered number: 7120391. A Calorius windmill producing up to 4 kW of heat. kris de decker | 4, 2013, Joules experiment: An historico-critical approach, Marcos Pou Gallo Advisor. I am curious about the potential for a hybrid wind turbine (clutchable): Generate electricity during peak hours (high price) The four heating concepts are ranked based on their yearly capital and operational expenditures, assuming a lifespan of 20 years. Due to how the article was structured, it sometimes seemed to argue that water brake windmills are more efficient than electric heat pumps. What I don't quite understand is: heat will be a byproduct of using electricity anyway, since it is always the waste product in the end. March 02, 2019 at 01:18 PM. Like a joule machine, it converts rotational energy into heat without the involvement of electricity. How to Build a Practical Household Bike Generator, The Printed Website: Volume III & The Comments. Would the heat be sufficient to kill pathogens in the water tank for longer-term water storage? I just wanted to comment in relation to the article and the use of heat pumps. To use a heat pump and avoid using grid power we would have needed quite a large PV array or we would have had to operate it from our battery which would reduce our overnight reserve power. Logan | 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. Illustration: Rona Binay for Low-tech Magazine. 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. 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