The paper presents operation examination results of a heating system equipped with a heat pump, manufactured by the Sekut company, equipped with a scroll type compressor. The performed statistical analysis has shown a significant influence of external temperature and heat transfer coefficient to the COP value. Within the analysed period, the COP maintained a level of 2.6 at an average monthly temperature of -6°C, with a transfer coefficient of 15%.
W opracowaniu przedstawiono wyniki badań eksploatacyjnych systemu grzewczego wyposażonego w pompę ciepła wyprodukowaną przez firmę Sekut ze sprężarką typu scrol. Przeprowadzona analiza statystyczna wykazała istotny wpływ różnicy temperatur i ilości wyprodukowanego ciepła na wartość wydajności eksploatacyjnej pompy ciepła. Określona wartość sezonowego wskaźnika wydajności SPF kształtuje się na poziomie 3, tym samym spełnia wymagania dyrektywy 2009/28/EC.
Aim of the study Industrial soilless cultivation of plants is associated with the formation of leachate, which may pose a threat to the environment. Their management is an important issue due to the limitation of the dissipation of ingredients in the environment, but also with the view to limiting the use of water, which in this type of cultivation is key not only in terms of quantity but also quality. Material and methods The variability of nutrients in the leachates was analysed for everbearing strawberry of San Andreas variety cultivated in soilless conditions on gutters. Results and conclusions The chemical composition of leachates was characterized by a high dynamics of changes in the content of elements (nutrients) during the growing season. These changes are caused by the amount of nutrients given in the nutrient solution, and the frequency of fertigation due to transpiration and the amount of plant biomass conditioning the amount of components consumed. The chemical composition of the leachates from the strawberry plantation does not preclude their re-use in the recovery process.