The Practical Solar Heliostat System
Contents
1. e The cost of running the heliostats is minimal A night light running all night consumes more power than 100 heliostats running all day In fact each heliostat delivers 3 000 times more power than it consumes e Installation is accomplished with household tools so the cost of installation is low Handy homeowners can install the system themselves r Practical Solar gt b n Heqees aj Angles AYE n Deg Heliostat Horiz 3 51 T Heliostat Controller Collection Enable s Heliosta eiid ancy Tage VYertica Taget wide Taa Target i Altitude Heliostat jame AAMU iD bis A oF 02 v 7 25 3 er First 15897 AEAF Floor 703 Second 135 44 a DEAF 90 35 99 40 31 65 6 Driver box Each heliostat reflects 600 watts of heat and the equivalent light of more than forty 100 watt incandescent light bulbs What will you do with all that sunlight Natural Lighting Natural light is not only more efficient it is gentler to the human eye reducing eye fatigue and headaches associated with fluorescent lighting There are over 100 lumens per watt of sunlight Thus natural lighting produces 3 7 times more visible light per watt of energy than electrical lighting systems Practical Solar heliostats can direct sunlight through windows and down into skylights and atriums with the help of a secondary reflector The mirrors on the heliostat can be focused during installation so the secondary re2. heliostats The number of heliostats in a system is up to the customer and will vary based on the application System Features HIGH PERFORMANCE amp VERSATILITY e Each heliostat can have multiple targets meaning it can perform different tasks at different times or day or during different seasons The user can change a heliostat s target at will or use the software s timer function to change it automatically New targets for any heliostat can be programmed in minutes e Practical Solar s Windows based software is the ultimate method of precise sun tracking It is superior to sensor based sun tracking in both reliability and affordability Rotation of the heliostats is digitally controlled to an accuracy of 0 1 degrees which translates to 5 inches over 100 feet e The user has the option of focusing the 8 individual mirrors in the heliostat mirror frame to customize the size and shape of the reflected sun spot It is possible to achieve a 4X sun concentration per heliostat RUGGED amp MAINTENANCE FREE e Heliostats never need to be adjusted or updated Each heliostat s position and calibration is permanently registered in the system e Mirrors will rarely if ever need to be cleaned in most locations e Heliostats are very stable in high winds four struts form a pyramid of structural support behind the mirror frame e External parts are stainless steel and aluminum all rust free and extremely durable CosT EFFECTIVE
3. The Practical Solar Heliostat System Direct sultant where You want Lt when You want ae We are proud to introduce the Practical Solar Heliostat System the world s first computer controlled heliostat system that s easily installed using only hand tools We have combined rugged design with superior tracking technology amp user friendly software that runs on your PC The software can control up to 200 heliostats and each heliostat can have its own targets and timer settings Practical Solar heliostats use mirrors to reflect sunlight onto a fixed target You can use one or more heliostats to reflect sunlight through windows and skylights for daylighting and direct space heating Or you can use several heliostats for concentrating solar power CSP applications On a clear day each heliostat reflects 600 watts of heat and the visible equivalent of forty incandescent 100 watt light bulbs If you use your heliostat system for thermal applications like space heating you may qualify for a variety of federal and state tax credits and sales tax exemptions You can find out more about these incentives at www dsireusa org 2 A Practical Solar Heliostat System consists of any number of heliostats and one control system Each heliostat is composed of a mirror frame and heliostat housing The control system includes Windows based software and a driver box which can control up to 200
4. flector can be quite small e g 2 foot diameter circle The sun rays crisscross as they leave the secondary reflector and are gently dispersed downward through the skylight This technique provides an opportunity for building designers a skylight can be small in size to minimize thermal losses through the glass and at the same time the skylight can receive as much light as a skylight many times its size The result is that maximum energy comes in while minimal energy goes out Heliostats can also dramatically increase light input into natural lighting receivers and light tubes Health Using heliostats during the winter months for natural lighting works as light therapy to offset Seasonal Affective Disorder SAD winter depression While many therapeutic products available on the market simulate natural sunlight Practical Solar heliostats deliver the real thing Symptoms of Seasonal Affective Disorder include feelings of depression sleeping too much craving sweets and having low energy Heat Individual heliostats can be used for direct thermal applications meaning that sunlight is applied directly to an area or object s to be heated rather than going through a central collector or receiver For example heliostats can directly heat a swimming pool or supplement a building s heating system by directing sunlight through windows and skylights More sophisticated thermal applications distribute heat from a central recei
5. perature range ea AORC o 99 humidity non condensing range Maximum distance 100 meters from heliostat s RS 232C standard serial connection USB to Serial Port adapter is included Computer connection Feedback from Customers using Heliostats for Natural Lighting My heliostat has been performing flawlessly The first target was an area that was very internal to my house and otherwise dark and cold It is now bright and noticeably warmer both physically and psychologically Also the window the heliostat reflects through was usually quite cold to the touch Now it is warm and more comfortable to sit near Bill Stroud Milton MA think it s an understatement to say that having some more sunlight cheers your disposition In our case we spread the light across this panorama of windows slightly above our heads It makes a room which is a pretty room even more attractive because we are splashed with sunlight for much of the day We were able to do that with just one heliostat because we were able to adjust the position of the various smaller mirrors Victor Del Vecchio Canton MA
6. ube amp mirror natural lighting systems e Illuminating museum amp art exhibits e Growing vegetables in wintertime or in shaded areas e Drying paint or wood outdoors or drying linens on a clothesline e Drying shaded exterior walls to reduce mildew e Sign illumination e Moonlighting a patio or deck at night software can be adapted for moon tracking i sofi vare C ive 0X j 9 s at P a Each heliost mirror frame helidstat AGL aaa 995 wy Please a Practical Solar with your questions amp orders info practicalsolar com or 617 464 1770 HELIOSTAT SPECIFICATIONS 18 Ibs 8 kg includes mirror frame excludes reflectors 2 conductor cable stranded amp unshielded with overall jacket see gauge guide in User Manual Electrical power lt 100 milliwatts 0 1 watts average consumption lt 1 watt hour day Positioning accuracy 0 11 degrees Electrical interface i M 60 degrees Azimuth 50 5 temperature range E ergm niall 0 100 relative humidity range Maximum wind l 80 kilometers hour 50 MPH speed operation Maximum wind l a 150 kilometers hour 90 MPH DRIVER BOX SPECIFICATIONS SEXLE X 2 203X10 2X5 1CmM 0B bs 0 4 eerie 12 VDC using 120 240 VAC 47 63 P J Hz switching power supply included 0 25 watts heliostat 200 maximum higher power drivers Heliostats array on request 20 C to 50 C 4 F to 122 F tem
7. ver or collector CSP receiver which is the target of the heliostats concentrated sunlight Applications include hot water heating air conditioning with hot water driven absorption chillers thermal desalinization hydrogen H production for fuel cells and low temperature industrial and agricultural applications e g drying of wood grain leather Practical Solar plans to offer ancillary products like CSP receivers within the next year Electrical Power Heliostats with thermal engines Thermal engines convert heat to electrical power Most thermal engines require extremely high temperature input but organic Rankine cycle ORC microturbines and some Stirling engines can operate with inputted temperatures below 232 C 450 F and are highly compatible for use with heliostats Heliostats with advanced solid state technologies Exciting new technologies are on the horizon that could be combined with heliostats to create a distributed generation system capable of delivering 5 50 kW of electrical power Practical Solar continues to monitor companies around the world that are developing ever less expensive and more efficient concentrator cell technologies that directly convert concentrated solar energy to electricity Miscellaneous Applications Here are some additional uses of heliostats suggested by our customers e Lighting windowless rooms like medical and dental exam rooms by using heliostats in conjunction with t
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