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Plants utilize photons at wavelengths between 400 and 700 nm. These photons, called photosynthetically active radiation (PAR), represent only a part of the total solar spectral energy. The optical waveguide solar plant lighting system has the potential to generate electric power while providing plant lighting. Recently, Physical Sciences Inc. (PSI) demonstrated simultaneous PAR transmission and photovoltaic (PV) power generation at its solar facility. In this paper, we will discuss the results of our work pertaining to feasibility of simultaneous plant lighting and electric power generation.

A 20 watt thermophotovoltaic (TPV) battery substitute system is being developed that will provide higher storage capacity and lower weight than the batteries currently used for many military missions. It can also be instantaneous recharged by refueling with propane. The TPV battery substitute incorporates several advanced design features. These include: an evacuated and sealed enclosure for the emitter and photovoltaic (PV) cells to minimize unwanted convection heat transfer from the emitter to the PV cells; a selective tungsten emitter with a well matched gallium antimonide PV cell receiver, spectral control optical filters to recycle non-convertible radiant energy, and a silicon carbide thermal recuperator to recover thermal energy from the exhaust gases. The design of the system and fabrication of the components are discussed.