While microturbines and fuel cells have garnered the majority of media interest with respect to the future of distributed generation, Stirling technology has a promising story to tell as well. That is our aim all along the chain. Also, since the combustion byproducts are never in touch with the cylinders, and there is no metal-metal contact, the potential for wear is substantially reduced.While maintenance is obviously dependent on duty cycle, STM Power expects its commercial engines will require only one preventive service check per year, after several thousands of hours of operation, and a major engine overhaul at about 50,000 hours. “To succeed commercially, we decided we needed to take the Stirling concept and make it an industrial engine.” STM has made several technological advancements from previous designs to increase the economic and commercial viability of its product.Earlier engine designs relied on two pistons in a single cylinder, the upper piston to displace the working gas and the lower piston to transmit the power to the crankshaft.
By choosing “I Agree”, you understand and agree to Clarion’s Through the development and application of high-temperature alloys designed specifically for the engine, which will permit operating temperatures of up to 1,050 C (1920 F), STM’s Johansson expects to exceed a 40 percent electric efficiency level (LHV) in coming years.The STM engine is particularly suited for combined heat and power applications. Regardless of the market price charged for the STM engine, the bogey for the manufacturing cost is in the $400/kW range, says McKenna, comparable to that of reciprocating engines. moteur stirling de François Nicolas -louis Virieux breveté en 1902 - Duration: 20:04. fredyfredy42 122,050 views. However, in CHP systems, this so-called "waste" heat is used and not wasted, leading to significantly higher efficiences.Compared to the separate generation of electricity and heat, cogeneration reduces the energy consumption required to produce these two essential requirements of modern society by more than a third. The electrolyzer is expected to consume less than 10 W of power, according to Johansson.The STM 4-120 engine operates at heater head temperatures of 700-800 C (1290-1475 F), with a water/glycol cooling medium temperature of 50-70 C (120-160 F), resulting in a net electrical efficiency of almost 30 percent (LHV). Idle to full-load operation can be achieved in one-third of a second. Bore 64mm, Stroke 50mm, Air 8 bar, Swept volume 225cc. STM’s 4-120 engine (Figure 1) relies on a single piston per cylinder design. Stirling Energy Systems estimates the cost to produce electricity from a 1,000 MW solar dish installation would be about 6 cents/kWh. Das Gesamtsystem weist jedoch einen Verlust von fast 34% auf.With this method, power is generated as it is required, so that generation matches exactly with the actual consumption. For the STM engine, therefore, more than 150,000 Btu/hr (44 kWth) of 130 F hot water can be recovered using a water/water heat exchanger for use in cogeneration applications. The expansion of the power supply system that is now essential due to the increased use of renewable energy technologies in centralised power plants becomes unnecessary with decentralised energy generation using CHP methods.
Microgen Engine Corporation has been working for many years on the development of a free-piston Stirling engine that is suitable for mass production. Compared to photovoltaics, a higher proportion of power needs can be generated at home, meaning that the demand of electricity from the public network is low. “Cost is the main issue, and to attack cost, we are basing our manufacturing process on the lessons learned from 100 years of experience with the internal combustion engine.” The engines will ultimately be produced in assembly-line fashion using parts that can be sourced within a two-hour drive of STM’s Ann Arbor, Mich. offices, says Johansson.
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