Experimental investigation of two modified energy-saving constructions of solar greenhouses

The paper presents outcomes of experimental evaluation of operation of two structures of sustainable greenhouse systems. Thermal performance of greenhouse with on-ground heat accumulator and movable internal heat reflectors, and of greenhouse with under-ground accumulator and movable heat (roof-based) reflectors, has been analyzed. Metering of solar irradiation, and temperature and humidity inside greenhouses, has been executed for different seasons and regimes. Conclusions regarding basic peculiarities of operation of two topologies of greenhouses have been formulated.