| Abstract [eng] |
Unlimited use of resources has changed the world radically. As a result, we are facing global warming, air pollution, exhausted primary energy resources; we are predicting and experiencing global natural anomalies and many other things. Therefore, today, being responsible consumers, we have to find ways how to maintain the balance between our needs and nature’s potential. The objective of the thesis is to analyse the possibilities of the use of solar energy technologies for the preparation of hot water in residential multi-storey buildings by assessing economic aspects thereof. To conduct this analysis, the review and assessment of the environment being examined was carried out. Technical condition of residential multi-storey buildings in Lithuania, thermal energy infrastructure and possibilities to integrate renewable energy source were assessed. A standard residential multi-storey building was chosen as a research object. This building is located in Mažeikiai city. It has 43 apartments, 58 residents. Total residential area is 2,331.34 m2. Domestic hot water needs were calculated. To meet these needs, the amount of energy required per year is 231,58 MWh. Also, climatic conditions in this location were analysed (average monthly and annual temperature, amount of solar energy per m2, solar radiation time). Two renewable energy technologies that operate on the principle of energy storage were selected. One of them is thermodynamic heat pumps, which have a great potential as they transform lower potential heat not only from environment but also absorb solar energy. Calculated power of the equipment required to meet the needs of domestic heat water is 48,20 kW. The second selected system – solar panels which are quite popular and known in Lithuania. The area of designed solar panels – 60 m2. Technological indicators of technologically-based systems were calculated, including comparative technical analysis. Economic analysis part includes local estimates for equipment installation, calculation of the payback period, and comparison of economic indicators of analysed renewable energy systems. |
