Patent AU-2012100261-A4 (AU)
Title: Mgctc
Inventor: TANG ZHAO KUN
IPC: F24S23/71
Filed: 2012-03-08
Granted: 2012-07-12
Abstract: Patent Application Abstract of MGCTC Abstract The most basic essence of optical principle is: light has the inevitable reaction at the interface according to the shape and the materials properties on two sides. Based on this principle, the gradient arc trough may be designed possible with the shape of two-dimensional symmetry which is extended at the third dimension under using the transparent optical materials. It is self-adaptive to change scope in half- angle of the sun declination without tracking. It can work normally with high efficiency and in proportion. And then the effective working hours of the silicon PV panels which use the concentrators can be greatly extended in sunshine days. The panels can still supply power in lower radiation intensity. The power fill factor FF or real power electricity of the panels can be greatly increased too. Using this concentrator and author's another invention "M-PIN-SPVSC (Multiple PIN Composition Silicon Super PV Cells for Solar Concentrator)" together, solar electrical energy generation will become basic energy and the most valuable investment project probability. [01] According to the descriptions of MGCTC (Multiplex Gradient Curve Trough Concentrator) in the subsidiary patent claims items in [0002] -[008] [01.1] This invention determined four basic design elements which make solar concentrator trough work normally and efficiently. They are: a. Transmissivity and Index of refraction of the optical materials; b. The sun ray contact point on the inside-arc surface of trough wings, the point tangent relative to the Y-axis deflection and the changing scope of entire arc surface curvature. c. The minimum rotation angle range of each reflection arc (outside-arc) d. Thickness control of the trough wings from top to bottom. [01.2] Although the optical material with higher refractive index is easier to design a high concentration ratio trough, the special ultra clear glass is still determined as the trough Mr. (Richard) Zhao Kun TANG / Add: NO. 68 Farnell St. WestRyde NSW 2114 1 Mail: austamzcnLzrmail.comn/hotmnail.comn Mobile: (Australia) 0404248933 / (China) 0086-138 1 6709498 Patent Application filled optical material while considering comprehensive performance and cost-effectivity. Its Transmissivity is more than 92%, and the index of refraction is 1.56. [01.3] Considering the silicon PV panel with this concentration trough could be set-up on the roof of ordinary dwelling, this invention pre-determined the trough design height as around 100mm. Because concentrating will increase the maximum electric current (current capability) of the PV cells bar multiple times, the bottom width is thus 10 mm. In fact, the concentration ratio will reach around 4 times, which is prepared to be increased further to medium concentration ratio, as a radiation concentrator average efficiency to 70% around. [01.4] In this design, materials, processing and cost are all taken into account. [02] According to the descriptions of MGCTCin the subsidiary patent claims items in [0002] [008] [02.1] Based on a large number of experiments and calculations, and according to optical basic principles of refraction, reflection and total internal reflection, the retaining trough made of optical material can effectively form proportion light concentration, without tracking the change scope in half-angle of the sun declination. The shape design of trough wing inside-arc and outside-arc is the key. [02.2] According to the pre-determined refractive index 1.56 of optical material and trough height around 100 mm, and considering other basic factors and also through comprehensive coordination, the radian change range of the primeval segment of inside-arc which face to sunligut is then determined from the trough wing top-point to the bottom. The range in 8'00' ~3400' is one of the better choices. [02.3] According to determined primeval segment requirement, the primeval segment from top start radian to bottom end radian can be cut to meet design requirement and has proper curvature change rate, by adjusting focal line width 2P and eccentricity E values in the Mr. (Richard) Zhao Kun TANG / Add: NO. 68 Farnell St. WestRyde NSW 2114 2 Mail: austan(cnLe(e nail.com/hotmail.com Mobile: (Australia) 0404248933 / (China) 0086-13816709498 Patent Application conic unified equation expression 2py+ (e - y. Then the segment of inside-arc is formed by each fragment slightly rotated. [02.4] The segment of outside-arc to follow the changing formed by rotation of the inside-arc primeval segment. Usually each fragment rotation angle range is 3o00'~4'30'. [02.5] The shift of new top-point of the outside segment is formed by slightly outward shifting of the trough wing inside curve segment top, and each fragment rotation angle of outside-arc is maintained the minimum as possible, in order to minimize the thickness of the trough wing body and the width of the trough bottom and maximize the concentration ration as well. [03] According to the descriptions of MGCTCin the subsidiary patent claims items in [0002] [008] [03.1] For maximizing the concentration ratio, the inside-arc and outside-arc of the trough wing will have some proper modification. [03.2] By using the Fresnel lens elements and maintaining the trough wing body overall shape and original average slope, the pre-selected area of the inside-arc and outside-arc or fragments will be treated by the Fresnel-based processing, which can increase the incidence angle of the concentration trough withstood. [03.3] Because of the Fresnel lens element processing on the inside-arc and outside-arc, the two trough wings can be rotated outward with a bit angle, and thus trough average slope will be increased a bit, which means trough concentration ratio will be increased as well. [03.4] Because of the superimposed effect of each fragment rotation of arcs, the trough bottom width will be increased. The bottom is cut then from the trough centerline outward, in Mr. (Richard) Zhao Kun TANG / Add: NO. 68 Farnell St. WestRyde NSW 2114 3 Mail: austancn(imi)2mail.com/hotmai ii.com Mobile: (Australia) 0404248933 (China) 0086-13816709498 Patent Application order to get the integer size to simplify calculation. The more important point is that the cutting can greatly increase the ratio of trough bottom width w to trough port width W, which is the concentration ratio. In order to eliminate the loss, which is caused by bottom centric height after cutting and that the ray in one trough wing pass through to the other wing and then diverged upward, the outside- arc(segment) can be shifted upward respectively and the trough top-poits will be at the same level to control the bottom centric height. But the shift up should be limited around 2.0 mm to avoid maladjustment of synchronized to follow change of inside-arc and outside-arc. The bottom centric height should be limited in o.5 mm. [03.5] Because the bottom of the concentration trough has a vertical base in this design, the radiation concentrating output can be more even when the concentrating trough exposes to the sun light only on one side wing. [04] According to the descriptions of MGCTCin the subsidiary patent claims items in [0002] ~ [008] [04.1] When this concentrating trough is used in currently silicon PV panels, the working performance will be improved in many aspects. [04.2] Because the base of the concentrating trough is glued by transparent plastic on the surface of silicon cells strip, and then effectively eliminating the moist heat-induced bad (wetting-+high temperature -+water vapour-+surface cracking from the shell) on current silicon PV cell surface. And the life of the silicon PV cells is thus effectively extended. [04.3] When this concentrating trough is used in current silicon PV panels, the working hours in sunshine days will be extended greatly, electricity power can still be supplied in the condition of medium or lower radiation intensity as well, and the power Fill Factor FF of currently silicon PV panels will be increased from 40-50% to above 70%. Mr. (Richard) Zhao Kun TANG / Add: NO. 68 Farnell St. WestRyde NSW 2114 4 Mail: austanen(ichmail.com/hotmail.comn Mobile: (Australia) 0404248933 / (China) 0086-13816709498 Patent Application [04.4] When this concentrating trough is used in currently silicon PV panels, the optimum operating temperature range will be chenged from 25-30"C to 60-70'C, which is more helpful to design the PV/ T (Photo Voltaic/Thermal system). [04.5] Because it is unnecessary to track the changing scope in half- angle of the sun declination and the solar panel can work normally, effectively and in proportion and has small thickness as well, the application of the silicon PV panels made by this concentrating trough can make ordinary dwelling roof become a small power station. Summary: Running out of fossil energy, pollution of the environment and excess emissions of greenhouse gases are conspiring the destroying of the earth, the home of the human being. The development of green alternative energy can not be separated from enthusiastic government subsidy at present, but it could be a good opportunity for green rogue malicious development. This invention provided the possibility of a choice to reduce the cost of solar energy utilization. When this invention combines with author's another invention "Multiple PIN Composition Silicon PV Cells for Solar Concentrator (M-PIN-PVSC)", it has then a realistic possibility to utilize solar energy as the basic energy. "The golden sun" will enter the life of human being from the song lyrics. Mr. (Richard) Zhao Kun TANG / Add: NO. 68 Farnell St. WestRyde NSW 2114 5 Mail: austangcna)Rzmail.com/hotmail.coin Mobile: (Australia) 0404248933 /'(China) 0086-1 3816709498