For three weeks in October 2009, the U.S. Department of Energy hosted the Solar Decathlon Competition in which 20 teams of college and university students competed to design, build, and operate their own version of a ...For three weeks in October 2009, the U.S. Department of Energy hosted the Solar Decathlon Competition in which 20 teams of college and university students competed to design, build, and operate their own version of a solar-powered house. Team North＇s mission was to deliver North House, a compelling, marketable solar powered home for people with active lifestyles, while building Canada＇s next generation of leaders in sustainable engineering, business and design. This paper deals with a solar-assisted space heating system that was studied as a potential design for the competition. Among several other conclusions, it was found that using a solar-assisted in-floor heating system can decrease the energy consumption to only 8% of the case without the in-floor loop.展开更多
The aim of the article concerns to the achieved research results regarding the viability of a megawatt-class space power plant based on the Rankine cycle for which the main objectives are to highlight the key issues r...The aim of the article concerns to the achieved research results regarding the viability of a megawatt-class space power plant based on the Rankine cycle for which the main objectives are to highlight the key issues responsible for improving the Rankine cycle efficiency. Two working fluids are studied （water and ammonia） on the basis of its well known characteristics. Cycles operating under top and bottom temperatures approaching the state of the art technology associated to cooling fluid reservoirs are key to improve the efficiency. With such strategy, the achieved thermal efficiency increases more than 20% with respect to conventional power plants. Mentioned benefits associated to the strategy based on the reduction of the required payload capacity, the condenser radiation surface and the power plant mass represent the main advantages of the proposed innovation techniques.展开更多
In 'in-tube propulsion,' that is the combination of conventional rocket propulsion and ballistic range operation,propulsion performance can be enhanced with increases in thrust due to spatial confinement and i...In 'in-tube propulsion,' that is the combination of conventional rocket propulsion and ballistic range operation,propulsion performance can be enhanced with increases in thrust due to spatial confinement and in payload capa-bility because propellant can be placed off board a projectile.This paper describes proofed concepts of in-tube propulsion by using repetitive laser pulses.展开更多
文摘For three weeks in October 2009, the U.S. Department of Energy hosted the Solar Decathlon Competition in which 20 teams of college and university students competed to design, build, and operate their own version of a solar-powered house. Team North＇s mission was to deliver North House, a compelling, marketable solar powered home for people with active lifestyles, while building Canada＇s next generation of leaders in sustainable engineering, business and design. This paper deals with a solar-assisted space heating system that was studied as a potential design for the competition. Among several other conclusions, it was found that using a solar-assisted in-floor heating system can decrease the energy consumption to only 8% of the case without the in-floor loop.
文摘The aim of the article concerns to the achieved research results regarding the viability of a megawatt-class space power plant based on the Rankine cycle for which the main objectives are to highlight the key issues responsible for improving the Rankine cycle efficiency. Two working fluids are studied （water and ammonia） on the basis of its well known characteristics. Cycles operating under top and bottom temperatures approaching the state of the art technology associated to cooling fluid reservoirs are key to improve the efficiency. With such strategy, the achieved thermal efficiency increases more than 20% with respect to conventional power plants. Mentioned benefits associated to the strategy based on the reduction of the required payload capacity, the condenser radiation surface and the power plant mass represent the main advantages of the proposed innovation techniques.
文摘In 'in-tube propulsion,' that is the combination of conventional rocket propulsion and ballistic range operation,propulsion performance can be enhanced with increases in thrust due to spatial confinement and in payload capa-bility because propellant can be placed off board a projectile.This paper describes proofed concepts of in-tube propulsion by using repetitive laser pulses.
