ENERGY CONVERSION OF CONCENTRATED NEAR INFRARED RADIATION IN A SOLAR GREENHOUSE

The aim of this investigation was to develope a new type of greenhouse with an integrated filter. The filter reflects and concentrates the near infrared radiation (NIR) which is then converted to electric power by means of TPV cells. In northern countries, with colder winter climate conditions, energy saving is an important issue. Moreover, during the summer, cooling by natural ventilation is needed to remove excess energy. In the southern countries with high global radiation and outdoor temperatures during the summer, cooling of greenhouses is even more important [1]. An important issue is the concentration potential of the integrated reflector. In this study several approaches were investigated and a circular trough reflector appeared to be most suitable. The most important properties concerning concentration capabilities were investigated to come to an optimal concept regarding generated power, constructional limits and growing conditions. With the concept presented in this paper, cooling can be combined with power generation up to a an electric output of about 20 kWh annually per m² greenhouse on a yearly base. The produced electricity can be used for energy supply and/or for extra cooling with a pad and fan system and/or a desalination system. The concept will be worked out to an operating prototype.