FREAパンフレット（英語）

20/26

An integrated manufacturing line of thin crystalline-silicon solar cells was provided in annex building of FREA to develop the technology for mass producing solar-cell modules with high eciency, low cost, and high reliability. In this line, cells can be produced with conversion eciency equal to or greater than that of mass-produced goods of manufacturers.At the demonstration test site for the geothermal heat utilization system at FREA, two GSHP systems are installed, one using a sheet-type and a Slinky-type heat exchanger installed at a depth of 1‒2 m under the ground and the other using a vertical-type (borehole type) heat exchanger installed at a depth of about 40 m. Based on a comparison of these systems, the team is developing a technology for optimizing an operating method combining both systems.A real-time monitor is also installed to display the underground tem-perature, COP (performance indicator) of the system, room tempera-ture, and other parameters in real time. The team aims to diuse and promote the geothermal heat utilization system through the “visualiza-tion” of real-time operating conditions and part of the heat exchange wells.Facilities1 Silicon Ingot Slicing (Wafering)2 Surface Texture Formation3 PN Junction Formation4 Antireection Film Deposition5 Electrode Printing and Firing6 Photovoltaic Module Fabrication and Reliability Multi-Wire SawSurface Texture Formation MachinesThermal Diusion ApparatusIon Implantation MachinePE-CVD MachineElectrode Printing and Firing MachineReliability Test MachinesVacuum LaminatorOverview of Ground-Source Heat Pump System Demonstration AreaInstallation state of underground heat exchangerGround-Source Heat Pump System Demonstration AreaThin-Crystalline Silicon Solar Cells R&D FoundryHeat Pump (inside)Heat Exchanger (borehole type)Heat Exchanger (sheet type)Heat Exchanger (slinky type)FREA Ground-Source Heat Pump SystemGround-Source Heat Pump System (inside)Inlet of a pipe into a roomTop of a heat exchange well (40 m deep)12345620