The article presents an analysis of the profitability of an investment consisting of a heat pump and a photovoltaic installation located in Poland for an exemplary single-family house. The factors that have a significant impact on the profitability and payback time of such installations operating in a dual configuration are described. A simulation of profitability taking into account the legal regulations and support systems was presented. The considered case of profitability concerns a specific technical solution in which an 8 kW air / water pump was used. The pomp cooperates with a photovoltaic installation with a power of up to 10kW, operating in a discount system with an energy consumption factor of 0.8. For the purposes of this article, the DCF (discounted cash flow) method was used. Using this method, it is possible to calculate the market value of the investment with the assumed boundary criteria. A comparison of the economic efficiency of an investment can be presented using the IRR (internal rate of return) method.

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Food trade is an important element of the global economy. As far as the European Union is concerned, it has sufficient resources to cover the EU population's demand for food, and it can export and exchange its own excess production for other products or services with other countries. However, Japan does not appear to be a significant partner in terms of food imports and exports. The aim of the study is to present a detailed analysis of the volume of food exports and imports according to the SITC and HS nomenclature and the perspectives for the development of mutual cooperation between the European Union and Japan.

Publikacja została przygotowana w ramach projektu "Utworzenie nowych interdyscyplinarnych programów kształcenia w zakresie ekonomii ochrony środowiska (w języku polskim i angielskim) w Uniwersytecie Łódzkim" współfinansowanego ze środków funduszy norweskich i krajowych.