| 摘要 |
A hybrid photovoltaic/thermal system comprises an array of inter-connected individual photovoltaic cells 106 attached to a substrate 107 having a high thermal conductivity with means for cooling the said substrate 107 and means for varying the orientation of the substrate 107 to maximise the flux of solar radiation incident upon the photovoltaic cells 106. The substrate 107 may be made from copper or aluminum. The means for cooling the substrate 107 comprises a number of tubes 108 in thermal contact with the substrate 107 and means for circulating a coolant though the said tubes 108. The cooling means may consist of Peltier devices. The means for varying the orientation of the photovoltaic cells 106 comprises a solar tracking unit and means responsive to signals generated by the solar tracking unit to operate a linkage 112 adapted to vary the orientation of the photovoltaic cells. The solar tracking unit may consist of two arrays of photovoltaic cells of identical characteristics which are positioned back-to-back on a common axle. The electric outputs from the two arrays of photovoltaic cells are connected to a difference analyser which operates an electric motor which rotates the two arrays of photovoltaic cells to a position where a null point is reached. This position is then used to orientate the system. |
