Abstract
Harnessing renewable energy sources (RES) using hybrid systems for buildings is almost a deontological obligation for engineers and researchers in the energy field, and increasing the percentage of renewables within the energy mix represents an important target. In crowded urban areas, on-site energy production and storage from renewables can be a real challenge from a technical point of view. The main objectives of this paper are quantification of the impact of the consumer’s profile on overall energy efficiency for on-site storage and final use of solar thermal energy, as well as developing a multicriteria assessment in order to provide a methodology for selection in prioritizing investments. Buildings with various consumption profiles lead to achieving different values of performance indicators in similar configurations of storage and energy supply. In this regard, an analysis of the consumption profile’s impact on overall energy efficiency, achieved in the case of on-site generation and storage of solar thermal energy, was performed. The obtained results validate the following conclusion: On-site integration of solar systems allowed the consumers to use RES at the desired coverage rates, while restricted by on-site available mounting areas for solar fields and thermal storage, under conditions of high energy efficiencies. In order to segregate the results and support optimal selection, a multicriteria analysis was carried out, having as the main criteria the energy efficiency indicators achieved by hybrid heating systems.
Highlights
Harnessing renewable energy sources (RES) using hybrid systems for buildings is almost a deontological obligation for engineers and researchers in the energy field, and increasing the percentage of renewables within the energy mix represents an important target in the energy sector
The purpose of the paper is to contribute to the methodological frame with a methodology based on the analytic hierarchy process (AHP) method for prioritizing on-site RES investments, in urban areas characterized by high construction and thermal energy density, within existing heating systems
We considered the situation of a thermal consumer, a building connected to the district heating system, with the renewable energy component exported by the consumer in the network on the "feed-in" principle
Summary
Harnessing renewable energy sources (RES) using hybrid systems for buildings is almost a deontological obligation for engineers and researchers in the energy field, and increasing the percentage of renewables within the energy mix represents an important target in the energy sector. In most countries, the share of RES in the energy mix is still insignificant [1]. In 2019, in Romania, solar energy delivered to the final client was less than 2.7%, referring to the production of electricity, with solar thermal energy being almost non-existent [2]. Among the different aspects of assuring sustainability throughout the entire energy chain—generation, storage, transport, distribution, final use, and recovery—energy economy and energy efficiency are the main valences of the process’ sustainability.
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