The mathematical model for the design of the RESHeat system

This paper presents new computer software for the analysis and selection of components for Resheat systems. The system uses renewable energy sources (RES) to produce heat and electricity. The developed software aims at the optimal selection of the Resheat system elements and their parameters based on the specific constraints of the investor. The Resheat system software takes into account statistical weather data for different project locations with different climates. In addition, the programme can perform a user-defined economic analysis of the system. The calculated results of the system performance in a given year may vary from the actual values by ± 20% for annual values and ± 40% for monthly values due to changing weather conditions in a given year. The results obtained from part of the resheat system (e.g. estimated energy gains from PV) were compared with the results obtained from calculations using commercial software to verify the accuracy of the calculations. The comparison shows that the results obtained from the Resheat software are at an acceptable level.