logging in or signing up spacepvs Willi Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 920 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: January 03, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: vinayrokz909 (10 month(s) ago) Its great to have people like u to give a concern for the world in the future. ur work is excellent. the presentation is outstanding.please send me this ppt. vinayrokz909@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: AMMUPRIYA (18 month(s) ago) hi, congrats for an awesome ppt.. i would be thankful if u send me this ppt.. plsss this is my mail id ushanedunuri@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: VISHMA (26 month(s) ago) please send me this ppt to my id-vshmsubbaiah@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Space-Based Solar Power: Space-Based Solar Power James Harkins, Dan Livingston, Alex Wong, Aaron SandersHow it works: How it works Solar panels on satellite capture light, sends power to earth using microwave wireless power transmission technology Signal sent from receiving antenna on earth (green) allows satellite to pinpoint it’s microwave beam.History: HistoryDesign Ideas: Design Ideas Sage-Hall Thrusters Thrusters must be used to counteract solar winds The space-based antenna needs to be at least 1 km in diameter, making it far larger than any satellite ever proposed. Recieveing antenna (an array of wires) must cover 20,000 acres. Sidebands not worth capturing Laser alternative to microwave power transmission.Technology obstacles to overcome: Technology obstacles to overcome Example of self destructive arcing Image: http://gltrs.grc.nasa.gov/reports/2000/TM-2000-210210.pdf Solar Arrays: Solar Arrays Weight between 0.5 kg/kW to 10 kg/kW Lifespan is about 20 years Exposure to charged particles can reduce the lifespan drastically Naturally degrades about 1 to 2 percent per year Efficiency up to 30% Solar radiation is 5-10 times greater in spacePower: Power Efficiency of power transmission is about 50% Microwave transmission will diffract greatly Total efficiency is about 7% Power yield from rectenna is about 90 W/m2 Lasers are an alternative to microwaves Rectenna will only need to be 180m in diameterBenefits of SSP: Benefits of SSPGeneral Benefits: General Benefits No pollution after construction No ghg during power generation Source of energy is free Large amount of energy potential.Space Advantages: Space Advantages Less atmosphere for sunlight to penetrate for more power per unit area Any location on Earth can receive power Satellite can provide power up to 96% of the time Solar panels do not take up land on Earth Lots of space in space Promote growth of space, solar, and power transmission technologyProblems with SSP: Problems with SSP VERY expensive initial cost Microwave/lasers may be harmful? Cosmic rays can deteriorate panels Maintenance Problems Very large receiving antennas on earth Solar winds could kick it off course Would need a complex propulsion system VERY Expensive Initial Costs: VERY Expensive Initial Costs Cost of Lifting Cargo Into Space using Space Shuttle is currently $10000/kg Reusable Launch Systems looking to reduce this cost are underdeveloped Space ElevatorMicrowave Concerns: Microwave Concerns At the earth's surface, the microwave beam has a maximum intensity in the center of 23 mW/cm2 (less than l/4 the solar constant) and an intensity of less than 1 mW/cm2 outside of the rectenna fenceline Retrodirective phased array antenna/rectenna + ≠ http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800022396_1980022396.pdfVery large antennas/rectennas: Very large antennas/rectennas The distance between the antenna and rectenna will be roughly the distance from Earth to geosynchronous orbit (22,300 miles) For best efficiency the satellite antenna must be circular between 1 and 1.5 kilometers in diameter The ground rectenna would need to be elliptical and around 14 kilometers by 10 kilometers http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800022396_1980022396.pdfVery large antennas/rectennas (cont.): Very large antennas/rectennas (cont.) Anything smaller would result in excessive losses due to sidelobes. To collect and convert the desired energy the satellite would need between 50 and 100 square kilometers of collector area using standard ~14% efficient monocrystalline silicon solar cells making this much larger than most man-made structures on Earth. Though not unfeasible, such an enormous undertaking in orbit has never been attempted image: http://www.spacefuture.com/archive/conceptual_study_of_a_solar_power_satellite_sps_2000.shtml Microwave power distribution on the ground surface.Targets: Targets Launch costs: < $250/kg Currently: $10,000/kg Not feasible with chemical rocket technology Space elevator SSP array costs: < $1,000/kW Must be very efficient Currently: $2.4 million/kW Ground-based: $5,000/kW Operation and Maintenance: < $0.01/kWh You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
spacepvs Willi Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 920 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: January 03, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: vinayrokz909 (10 month(s) ago) Its great to have people like u to give a concern for the world in the future. ur work is excellent. the presentation is outstanding.please send me this ppt. vinayrokz909@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: AMMUPRIYA (18 month(s) ago) hi, congrats for an awesome ppt.. i would be thankful if u send me this ppt.. plsss this is my mail id ushanedunuri@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: VISHMA (26 month(s) ago) please send me this ppt to my id-vshmsubbaiah@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Space-Based Solar Power: Space-Based Solar Power James Harkins, Dan Livingston, Alex Wong, Aaron SandersHow it works: How it works Solar panels on satellite capture light, sends power to earth using microwave wireless power transmission technology Signal sent from receiving antenna on earth (green) allows satellite to pinpoint it’s microwave beam.History: HistoryDesign Ideas: Design Ideas Sage-Hall Thrusters Thrusters must be used to counteract solar winds The space-based antenna needs to be at least 1 km in diameter, making it far larger than any satellite ever proposed. Recieveing antenna (an array of wires) must cover 20,000 acres. Sidebands not worth capturing Laser alternative to microwave power transmission.Technology obstacles to overcome: Technology obstacles to overcome Example of self destructive arcing Image: http://gltrs.grc.nasa.gov/reports/2000/TM-2000-210210.pdf Solar Arrays: Solar Arrays Weight between 0.5 kg/kW to 10 kg/kW Lifespan is about 20 years Exposure to charged particles can reduce the lifespan drastically Naturally degrades about 1 to 2 percent per year Efficiency up to 30% Solar radiation is 5-10 times greater in spacePower: Power Efficiency of power transmission is about 50% Microwave transmission will diffract greatly Total efficiency is about 7% Power yield from rectenna is about 90 W/m2 Lasers are an alternative to microwaves Rectenna will only need to be 180m in diameterBenefits of SSP: Benefits of SSPGeneral Benefits: General Benefits No pollution after construction No ghg during power generation Source of energy is free Large amount of energy potential.Space Advantages: Space Advantages Less atmosphere for sunlight to penetrate for more power per unit area Any location on Earth can receive power Satellite can provide power up to 96% of the time Solar panels do not take up land on Earth Lots of space in space Promote growth of space, solar, and power transmission technologyProblems with SSP: Problems with SSP VERY expensive initial cost Microwave/lasers may be harmful? Cosmic rays can deteriorate panels Maintenance Problems Very large receiving antennas on earth Solar winds could kick it off course Would need a complex propulsion system VERY Expensive Initial Costs: VERY Expensive Initial Costs Cost of Lifting Cargo Into Space using Space Shuttle is currently $10000/kg Reusable Launch Systems looking to reduce this cost are underdeveloped Space ElevatorMicrowave Concerns: Microwave Concerns At the earth's surface, the microwave beam has a maximum intensity in the center of 23 mW/cm2 (less than l/4 the solar constant) and an intensity of less than 1 mW/cm2 outside of the rectenna fenceline Retrodirective phased array antenna/rectenna + ≠ http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800022396_1980022396.pdfVery large antennas/rectennas: Very large antennas/rectennas The distance between the antenna and rectenna will be roughly the distance from Earth to geosynchronous orbit (22,300 miles) For best efficiency the satellite antenna must be circular between 1 and 1.5 kilometers in diameter The ground rectenna would need to be elliptical and around 14 kilometers by 10 kilometers http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800022396_1980022396.pdfVery large antennas/rectennas (cont.): Very large antennas/rectennas (cont.) Anything smaller would result in excessive losses due to sidelobes. To collect and convert the desired energy the satellite would need between 50 and 100 square kilometers of collector area using standard ~14% efficient monocrystalline silicon solar cells making this much larger than most man-made structures on Earth. Though not unfeasible, such an enormous undertaking in orbit has never been attempted image: http://www.spacefuture.com/archive/conceptual_study_of_a_solar_power_satellite_sps_2000.shtml Microwave power distribution on the ground surface.Targets: Targets Launch costs: < $250/kg Currently: $10,000/kg Not feasible with chemical rocket technology Space elevator SSP array costs: < $1,000/kW Must be very efficient Currently: $2.4 million/kW Ground-based: $5,000/kW Operation and Maintenance: < $0.01/kWh