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. Local heating can also be combined with direct heat production, and then you win even more. Posted by: The thing about heat pumps is that they move more heat energy than it takes to drive them. 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. The hot water is stored in a tank. 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. [8] A 2013 study using a prototype obtained similar results, and calculated the efficiency of the system to be 91%. Also great for even, oscillating heat . It's cheaper than my oil fired neighbours, 100% carbon free and practical for many people to install now. 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). 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. Again, also here things dont change much from the conventional. The study referenced in note 15 contradicts your claims. Great work and service that you are providing! Using eddy current heaters, windmills could provide direct heat at higher temperatures, making their potential use in industry even larger. Kris De Decker | Ft. . Pan Stanford Publishing, 2013. I think they are claiming a round trip efficiency of 60% for electricity storage. 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. For example, here in Barcelona, it would be useless. , Cao, Karl-Kin, et al. 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. Could this heat storage via water tank double as a way to store potable water? Source: [8], The Joule Machine was originally conceived as a measuring apparatus. Pro Breeze. YOUR SHED, YOUR WAY. How would it be easily replicable? The heat medium would be work done inside the house by the electricity. 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. 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. Seems like they suffered from mechanical and plumbing trouble, probably related to the fact that the system was basically a semi-prototype. From 1993 to 2000, the Danish firm Westrup built a total of 34 water brake windmills based on this design, and by 2012 there were still 17 in operation. For a ground source domestic heat pump, that is typically 4 times more heat energy out than electrical energy in. 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. Arturs | 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. I would love to learn more about the feasibility of those mills as heating system for small houses. Press the space key then arrow keys to make a selection. Source: [7]. However, in the LO-FA windmill all mechanical parts for energy conversion were moved to the top of the tower. Posted by: It should be possible to create high heat for cooking this way -- about 400 degrees F, which is about the limit of most oils before they begin to smoke. Posted by: Luckily there are greener ways of heating your shelter this season without using electricity: 1) Fireplace and kerosene heater. , erneckien, Jurgita, and Tadas dankus. Consequently, 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 relatively small town or city, or an industrial area. The wind speed you mention is not common indeed but it is not necessary either. [7]. See our Erik | If you need to plug in a computer and mobile phone, the inverter would need a continuous power rating of 150W + 600W = 750W. 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. Consequently, 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 relatively small town or city, or an industrial area. 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. 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. [14]. Local heating can also be combined with direct heat production, and then you win even more. 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. A Calorius windmill producing up to 4 kW of heat. For example how much more heat do you get when you use ground loops or ground water vs outside air? So why not generate electricity that can be put to good use first? A mechanical windmill can also be coupled to a mechanical heat pump, which can be cheaper than using a gas boiler or an electric heat pump driven by a wind turbine. Water brake windmills may be a lot cheaper to build, but they are not more energy efficient because a heat pump only moves heat. I'm very curious to read those results, but you did not provide the link you are talking about Hi Kris - oh shoot - so sorry. Maybe a storage system with both hot and cold stores might be interesting. It's mechanical windmills with mechanical heat pumps that are more energy efficient (and cheaper) than wind turbines with electrical heat pumps. [1] In temperate or cold climates, the share of thermal energy is even higher. Images from Test at very high wind speed of a windmill controlled by a water brake, O. Helgason and, Posted on February 27, 2019 at 11:04 AM in, Keeping Some of the Lights On: Redefining Energy Security, 2-3 times as energy efficient compared to following the indirect path involving electricity conversion, very inefficient and dont always generate as much energy as was needed to produce them, compared to batteries or other common technologies, when solar thermal is used for power production, Ditch the batteries: off-grid compressed air energy storage, Keeping some of the lights on: redefining energy security, Restoring the old way of warming: heating people, not places, Wind powered factories: history and future of industrial windmills, WIND POWERED THERMAL ENERGY SYSTEMS (WTES), Integration of Thermal Energy Storage into Energy Network, The bright future of solar thermal powered factories. Nitto, Dipl-Ing Alejandro Nicols, Carsten Agert, and Yvonne Scholz. However, in this case a gearbox is required to achieve optimal efficiency. It is the calorie that is defined by the heat it takes to raise the temperature of 1 g of water 1 C. 1 cal is approximately 4.19 J and there are in fact several slightly different calories based on different definitions, see https://en.wikipedia.org/wiki/Calorie. The most recent and extensive studies to date are from 2016 and 2018, and compare different types of heat generating windmills with different types of indirect heat generation. I did not look into wind powered cooling but it could be possible. The lower 10 meters of the 20 meter high tower were filled up with 15 tonnes of water in an insulated reservoir. If you follow that approach, you win indeed. Direct heat production is cheaper, can be more energy efficient, and is more sustainable than indirect heat production. Posted by: Wind Talk Space Heater for Indoor Use, 1500W Electric Oscillating Portable Ceramic Tower Heater with Remote . I just wanted to comment in relation to the article and the use of heat pumps. Or is it just controlling the flow rate of the water? "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. 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. "Concept study of wind power utilizing direct thermal energy conversion and thermal energy storage." A heat generator based on this principle is basically a wind-powered mixer or impeller installed into an insulated tank filled with water. All text in Danish, but Google translate is your friend! This is only a preview. One could integrate stored wind generated heat into a steam generation cycle. 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. It's cheaper than my oil fired neighbours, 100% carbon free and practical for many people to install now. Or they could be fabricated locally. Dimitar Bounov | Some exclusions apply. The Joule Machine has lower weight, smaller size, and lower costs than an electrical generator. 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. Posted by: Given this, there is far more value in driving a heat pump rather than directly converting the mechanical energy to heat. 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. 4, 2013, Joules experiment: An historico-critical approach, Marcos Pou Gallo Advisor. , Real-world tests of small wind turbines in Netherlands and the UK, Kris De Decker, The Oil Drum, 2010. 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. 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. Subject: To build a water brake windmill from scratch. The oil then transferred its heat to the water storage in the tower. Could this heat storage via water tank double as a way to store potable water? There was also a "LO-RA" water brake mill. I wonder, if heat-generating windmills allow lightweight windmills to be economical, would that mean that they could also be portable? A heat generator based on this principle is basically a wind-powered mixer or impeller installed into an insulated tank filled with water. > But that's because you heat people, not spaces. With it though, how would one control the temperature of the house? March 11, 2019 at 02:53 PM. If you want to see the little relay the following link will take you there. When the heating is turned on, the water is pumped through the house and then flows back into the tank, where it can be heated again. That way it would be kept simple. ECO-WORTHY 1000W 24V Solar Power System 4kWh/day with Battery and Hybrid Solar Inverter for Home Shed RV: 6pcs 170W Solar Panels+ 2pcs 100Ah Lithium Batteries+ 3000W 24V Hybrid Inverter 4.6 (8) 1,79999 - 3,49999 Ecoheater 1000mm Slimline Greenhouse & Shed Heater HHT310 (120W) 4.2 (397) 3495 39.99 Get it Monday, 27 Feb FREE Delivery All Rights Reserved. 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, when I was a student and still owned a desktop instead of a laptop, I has a set-up where I had put a blanket around my desk like a make-shift kotatsu, with the computer desktop poking through. Of course, there are other ways but this is the simplest solution. The hydrodynamic retarder is well known as a brake system in heavy vehicles. In terms of using wind-driven mechanical heat pumps to produce heat. That said PV panels are so cheap now particularly as many people are upgrading that a simple resistance water heater does the job and probably for rather less than a heat pump. To simplify the process of powering your shed, there are kits available with all the parts you need included. Also, designing some cavitation into the submersed rotor might increase the rate of heating. It is much more practical to use solar thermal. For the moment, there's no other option than to build a water brake windmill from scratch. They are in their seventies and eighties now, some of them have passed away. First, thank you for putting up such an interesting web site. The system is functionally designed to create and retain heat so would need quite a few modifications to also act as a cooler. Or would it be better to generate e-power all the time if the turbine is capable of it? In the meantime, if anyone else has more info, feel free to share it. The calorie was defined already in 1824. A direct mechanically coupled heat pump may not be as efficient as it sounds. 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. These are comprised of a magnet mounted on a rotating shaft, and can reach temperatures of up to 600 degrees Celsius. 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