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In Bucharest-Romania about 72% of heat demand for residential, industrial and tertiary consumers is provided in District Heating Systems, so that heat losses are extremely important. Heat transport networks (from energy sources to substations) in Bucharest are summarizing over 987 km of transport pipelines. The District Heating System is obsolete in all its components, from source to consumers. An...
The paper presents the mathematical modeling and simulation of a system using a solar panel, a heat exchanger and a hot water storage tank for household consumption. Starting from mathematical equations which describe this system, the model was developed with the help of Matlab — Simulink program. As results, one can see the inlet and outlet temperatures evolution over time on primary and secondary...
This paper presents the first results obtained in the frame of an international project of collaboration between Romania, Bulgaria and France concerning the integration of renewable energy systems into buildings and urban areas. The study is focused on the dynamic simulations of the energy performance resulting from the use of a solar thermal system designed for the DHW production, in the case of...
This paper presents the first results obtained in the frame of an international project of collaboration between Romania, Bulgaria and France concerning the integration of renewable energy systems into building and urban area. A solar radiation model, previously validated, is used to calculate the available solar energy in various planes (with various inclination and azimuth) for a photovoltaic or...
This paper presents the results from simulation work regarding the design of a net zero energy office building with a mixed-mode ventilation system which assures the thermal comfort of the occupants according to the ASHRAE 55/2010 Standard, with a rational consumption of energy and a minimal environmental impact. This was a particular difficult task as the studied city, New Delhi, is one of the most...
The large industrialization in 70s and 80s provoked a transfer of population from the rural areas to cities. Especially in the communist countries, massive multi-storey buildings were erected, supplied by a district heating grid with big power plants. Nowadays the maintenance of such big systems is big-energy consuming and refurbishment is very hard to accomplish and therefore, in many situations,...
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