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FUEL FROM THE SKY: SOLAR POWER’S POTENTIAL FOR WESTERN ENERGY SUPPLY It is for that reason that both SES and STM Power have engaged in serious evaluations of their motors. Both companies are confident that new motors could be produced in large numbers at low cost and would be more reliable than current motors. However, doubts remain, because the performance of laboratory bench prototype Stirling motors, which are fired by natural gas, does not translate well into solar applications. This is because the solar flux that hits the heater head of a dish-mounted Stirling motor is less homogenous, resulting in thermal stress and pressure differentials in the pistons of the motor. Aside from questions about the reliability of the Stirling motor, the dish Stirling is the quintessen- tial thermal solar power plant: ● Its two-axis tracking mechanism allows it to maximize solar energy collection. ● The generation threshold is relatively low. ● The unit ramps to grid synchronization within a minute. ● It has the highest efficiency of any solar generating technology. ● It requires the least amount of land in relation to peak capacity and energy production. ● Its high engine-operating temperature allows air cooling, thus eliminating the need for cooling water. Exhibit 42 shows SES’ dish Stirling system. Dish Stirling units share many characteristics with wind turbines. Like wind turbines, dish Stirling units are intermittent energy sources, have only a pedestal as footprint, can be built within days (actual assembly takes only a few hours), and come in small unit sizes and are thus modular. Tactics for marketing dish Stirling plants, therefore, could emulate some of the market penetra- tion tactics used for wind turbines. They also allow for smaller solar farms that may fit better into renewable energy portfolios and can be expanded in modules. In contrast, a 100-MW para- bolic trough plant requires an all-or-nothing investment decision of $200 million to $300 million.6 The same is true for power towers. Dish Stirling to Set New Efficiency Record Both SES and STM power are currently aggressively pursuing the introduction of dish Stirling systems into the market and are engaged in the development and construction of new dish Stirling units. Research at SES’ existing units has shown that the air-cooling system was original- ly over-engineered and that decreasing the cooling capacity can reduce parasitic loads. Additional changes to the motor design and the collector system will, in SES’ view, improve (net) peak efficiency at its next units by 10% from currently near 30% to 33%. This would set a new 88PDF Image | Solar Fuel From The Sky
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