Analysis of Solar Collectors Application and the Influence of Domestic Hot Water Consumption on Energy Demand in Multifamily Buildings with Implementation of LCA Methodology

Abstract

Solar thermal energy conversion for hot water preparation is common domestic applications, especially in detached houses. However, in the case of multifamily buildings, implementation of solar systems raises many concerns, particularly regarding the economic benefits. There is a lack of scientific papers presenting long-term operational results of this type of systems. Therefore, this paper presents results of 3-year measurements carried out in four multifamily buildings located in the Lublin region, in Poland. On the basis of conducted measurements, conventional energy consumption [GJ/m³] for domestic hot water preparation was estimated. Additionally, the influence of hot water demand [m³] on unit heat consumption for domestic hot water preparation [GJ/m³] is presented. Studies have shown that the unit energy consumption for hot water preparation decreases with increasing water consumption. Achieved results were assessed on the basis of LCA methodology with global warming potential technique.