Solar Organic Rankine Cycle Power System for Developing Countries, 978-3-659-76734-0, The concept of appropriate technology has been addressed for electricity production in remote areas of developing countries through the solar ORC technology.
The concept of appropriate technology has been addressed for electricity production in remote areas of developing countries through the solar ORC technology. The selection of working fluids plays an important role in ORC system. R245fa and R134a are recommended for power generation. In addition, R245fa works well for the heat source temperature of the range 100-120°C whereas R134a below 100°C. Vacuum type solar collector is used for obtaining the hot water which can produce the temperature of 120°C. The commercial scroll expander that adopt magnetic coupling has been used in the experiment. The experimental investigation of the small-scale ORC showed acceptable characteristics for the temperature of the 120°C that uses R245fa working fluid. The system efficiency is 8.5 % with the power output of 1.4 kW. From the economic point of view the solar ORC system cannot recover its investment until 19 years of installation and operation currently without any subsidies. The concept in this book is helpful for solar ORC developers, manufacturers, energy planners, rural practitioners, different aid and donor agencies for adopting the sustainable energy system technology.
High-performance aircraft turbine engine manufacturers are facing unprecedented increases in the amount of heat that must be released in order to maintain acceptable temperatures in supersonic engines that is required for the aircraft to operate at...
A prototype automotive waste heat recovery system has been fired up on a recently commissioned test rig at the University of Brighton. A free piston engine eliminates the entire mechanical drivetrain of a conventional engine, allowing ultra-efficient combustion cycles to be developed and reducing the parts count and cost. It completely removes the crankshaft constraint placed on piston movement that actually hinders efficient combustion, and allows piston motion to be optimized to deliver a cleaner, more efficient combustion process.
Wrightspeed Inc., a developer of range-extended electric vehicle powertrains for medium- and heavy-duty vehicles (earlier post), has unveiled the Fulcrum, a new proprietary turbine generator for use in its Route family of electric powertrains (Route for Class 3-6, Route HD for Class 7-8). The new 80 kW Fulcrum is a radial inflow, axial turbine, intercooled and recuperated. Fulcrum is a single shaft machine, the generator runs at turbine speed (~100,000 rpm). Weighing in at 250 lbs (113.4 kg), the Fulcrum is approximately 1/10th the weight of its piston generator counterparts and it is designed to have a 10,000-hour lifetime.
The use of microturbines in autos has been explored for a long time, with a number of manufacturers actively exploring the potential shortly after World War II: these included Rover in the UK; Fiat’s Turbina, introduced in 1954; a Chrysler Plymouth prototype turbine car also introduced in 1954; GM with its Firebird prototypes, also introduced in the early 1950s; and the limited production run Chrysler Turbine Cars, introduced from 1962-1964.
The Japanese began a 100 kW automotive ceramic gas turbine (CGT) project in 1990 and concluded it in 1997. The US Department of Energy (DOE) in the 2000s ran a cooperatively funded, multi-path technology development program called the advanced microturbine system (AMTS).
French 5.5 MW #geothermal organic Rankine cycle power plant by@Enertime http://t.co/b29c6bginq #HeatToPower #ORC
This significant Project gives all the means to the French geothermal industry to develop and improve its technological offer for worldwide export . This new success recognizes the technology and expertise of Enertime, pursuing its development as a major actor in France and on the international market for innovative turbomachinery and thermodynamic machine technology, helping the fight against climate change.
A new kind of CO2 engine is on the drawing board. If it works, travelers to Mars might have a ready-made source of power to make their stay more comfortable.
Researchers are developing an exotic turbogenerator that vents CO2 directly into the Martian atmosphere. If it works, travelers to Mars might have a ready-made source of power to make their stay more comfortable — though that’s a big “if,” to put it mildly.
The device would harness the so-called Leidenfrost effect to convert temperature differences into mechanical work.
Some more traditional turbines can and do use fancy air bearings and even magnetic bearings. They can also run on CO2. For example, Toshiba is building a flesh and blood power-generating supercritical CO2 turbine right here in Texas, USA. The main question at this point is, can this thing make real power, and if so, what kind of power? In other words, raw horsepower is great, but if it comes in turning at 100,000 RPMs and you can stop it with your finger, then no amount of practical gear reduction can shapeshift it into a torque you can use to drive an even remotely efficient matched generator.
The company said it hoped to complete the field in early 2017.
The 10-megawatt field, to be built on about 110 acres (45 hectares) in the desert town of Dimona in southern Israel, will combine existing solar thermal technology with an underground system that stores heat for use at night.
The company already has a working proof-of-concept for the storage system.
Exencotech has invented a new technique to convert low temperature heat (25 to 95ºC) to mechanical energy and electricity. The technique is used to save energy, boost process efficiency and reduce pollution. Several studies show an enormous market potential for products that could use low temperature heat to produce high grade energy like electricity. Exencotech has invented a new technique to convert low temperature heat (25 to 95ºC) to mechanical energy and electricity. The technique is used to save energy, boost process efficiency and reduce pollution.
The technology: is based on a volume expansion that takes place in a Phase Change Material (PCM) when the material changes phase. A volume expansion under high pressure gives a high energy output.maintains a high relative efficiency even for temperatures below 60 ºC.offers excellent price performance figures.is environmental friendly since it leads to a reduction of emission of green house gases through utilization of waste heat.is scalable which make it possible to build small sized systems.have been checked and scientific approved by scientist at the Stockholm Royal Institute of Technology (KTH).is unique and several patents have been identified and filed.is developed by an experienced team of international experts.
Waste heat recovery in industrial processes, vehicles and shipsPower generation from geothermal heatPower generation from the thermal gradient in sea water (OTEC)Waste heat recovery in electrical power plantsSolar driven electrical power generatorContinuous heat driven circulation pumps
Noise, excessive vibration and relative inefficiency are drawbacks of the piston-based internal combustion engines (ICE) that power today’s lawn and garden equipment, such as leaf blowers and lawn trimmers. But now Massachusetts Institute of Technology startup LiquidPiston has developed a rotary ICE that it says is significantly smaller, lighter and quieter, as well as 20% more fuel-efficient than the ICEs used in small-engine devices.
Material and manufacturing cost considerations for thermoelectrics are driving commercialization attempts more than just figures of merit (ZT) Silicide materials cost 100 times less and some can still get a ZT of over 1. Previously it was believed that major commercialization would not happen until ZTs were reached a 3. Interest in thermoelectrics for waste-heat recovery and localized cooling has flourished in recent years, but questions about cost and scalability remain unanswered. This work investigates the fabrication costs and coupled thermal and electrical transport factors that govern device efficiency and commercial feasibility of the most promising thermoelectric materials. For 30 bulk and thin film thermoelectric mate rials, we quantify the tradeoff between efficiency and cost considering electrical and thermal transport at the system level, raw material prices, system component costs, and estimated manufacturing costs. This work neglects the cost of heat, as appropriate for most waste-heat recovery applications, and applies a power generation cost metric in $/W and a cooling operating cost metric in $/kWh.
Calnetix Technologies, LLC has published a White Paper describing new processes for producing supplemental power for a ship’s |
Waste heat from the engines is an underutilized source of power that can be harnessed to augment electricity produced by the ship’s generators,” said Calnetix CEO Vatche Artinian. “While heat from the engine exhaust is already being used to generate steam on many ships, it has been difficult to harvest heat from lower-temperature sources, such as the engine coolant. Hydrocurrent™ technology aims to remove this barrier and tap into the low-grade jacket-water heat to generate additional electrical power without increasing fuel consumption.”
“Test data reveal that Hydrocurrent can produce up to 125 kW of electrical power from a temperature source as low as 80⁰C, saving up to 200 tons of bunker fuel and reducing carbon monoxide emissions by 18 tons per year by reducing the load on the ship’s bunker-burning diesel generators,” he added.
ElectraTherm utilizes Organic Rankine Cycle (ORC) and proprietary technologies to generate power from low temperature heat ranging from 170-252°F. With the typical engine running at about 35% efficiency, there is considerable waste heat between the jacket water and the exhaust. By acting as the radiator for the engine, ORC technology benefits include additional power generation, increased efficiency and reduced cooling loads. The elimination of radiator capital costs offsets up to 20% of the entire ORC project costs, delivering a payback of three years or less for diesel or heavy fuel oil-fired gensets.
A study of how heat spreads through melting materials could change the way that we store energy. Ideally, a report in the Journal of Applied Physics finds, heat lines should spread through a material in a fractal manner, like branches on a tree.
MAHLE invests in future technologies to reduce CO2: acquisition of Amovis GmbH Automotive World (press release) Amovis has a high level of competence in intelligent exhaust gas heat recovery using the ORC (Organic Rankine Cycle).
(Nanowerk News) In concentrating photovoltaic (CPV) systems only a small part of the incident solar energy can be converted into electricity and the majority of the incident energy is dissipated as waste heat. Although the waste heat could be utilized in conventional CPV/thermal systems, the applications are seriously limited due to the low temperature accompanying the waste heat. Professor Xu Chao and his group from North China Electric Power University (NCEPU) present a novel CPV/concentrating solar power (CSP) hybrid system. The dissipated heat is used to produce superheated vapor of refrigerant which is effective to generate power through an organic Rankine cycle (ORC), and thus the solar-to-electricity efficiency of the system can be significantly improved. This work was published in Science Bulletin ("Energy analysis of a hybrid solar concentrating photovoltaic/concentrating solar power (CPV/CSP) system").
Read more: Researchers propose a novel solar CPV/CSP hybrid system
The Seoul City Government announced on Feb. 9 that it will pursue an initiative to reduce air pollution by installing heating devices on taxi that can work even when the engine is off.
Air pollutants originating from cars represent 63 percent of the total, a major source of greenhouse gas emissions. Furthermore, fuel is wasted when allowing idling vehicles to run their engines.
To address the problem, Seoul City made a device last year that can gather up to 90 degrees of heat from a coolant system in the engine while the car is running. The gathered heat can be used for heating the car when the engine is turned off. The heating device is composed of an engine hour meter, a circulating pump, and an auxiliary battery.
The city government installed the device on a test taxi for the month of December last year as an experiment. After turning off the engine and circulating water up to 90 degrees, the time necessary for the temperature inside the taxi to drop to 36.5 degrees was measured. It was found that it was possible to heat the car for over 35 minutes.
After using the device for 99.2 hours, the car saved 118.8L of fuel, or 131,860 won (US$120.36). On top of that, it was possible to reduce the amount of CO2 emissions by 106 kg.
Enerji announces deal to co-develop outback WA hybrid solar thermal + storage plant that will also harvest waste heat from a fossil fuel power plant.
The energy in the Solastor tower – which is stored in high temperature graphite – can be recovered at any time by feeding a fluid into the receiver, where embedded heat exchangers extract the energy (usually as steam) and drive a steam turbine to produce electricity.
The project will also include an Opcon Powerbox: Swedish-made cogeneration technology that transforms waste heat into electricity – in particular targeting industrial, mining and power plants – for which Enerji has exclusive sales and distribution rights in Australia.
A solar thermal power station is much like a coal,natural gas or even nuclear power station once the source of heat has been established. Of course if we consider emissions or safety for each of these options Solar Thermal is the clear winner. For the Solar Thermal power plant the source of heat is the sun.
Molten salt is used to collect and store the sun’s energy as heat. Cold salt at 290 degree C, is pumped from the cold salt tank up the tower to the collector where it is heated to around 600 degrees C. It then descends to the hot salt tank where the heat can be stored for use during the night or pass on to the boiler for immediate use.
Methane originating from biogas or natural gas is an attractive and environmentally friendly alternative to gasoline. Adsorption is seen as promising storage technology, but the heat released limits fast filling of these systems. Here a lab scale adsorptive methane storage tank, capable to study the temperature increase during fast filling, was realized. A variation of the filling time from 1 h to 31 s, showed a decrease of the storage capacity of 14% and temperature increase of 39.6 °C. The experimental data could be described in good accordance with a finite element simulation solving the transient mass, energy, and impulse balance. The simulation was further used to extrapolate temperature development in real sized car tanks and for different heat pipe scenarios, resulting in temperature rises of approximately 110 °C. It could be clearly shown, that with heat conductivity as solei mechanism the heat cannot be removed in acceptable time. By adding an outlet to the tank a feed flow cooling with methane as heat carrier was realized. This setup was proofed in simulation and lab scale experiments to be a promising technique for fast adsorbent cooling and can be crucial to leverage the full potential of adsorptive methane gas storage.
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