Distributed energy system design and optimization: An office-building

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Insinööritieteiden korkeakoulu | Master's thesis
Degree programme
Environomical Pathways for Sustainable Energy Systems
41 + 22
With a rising demand of energy from the growing global population there is an urgent need to shift from the conventional ways of harnessing energy to a greener and sustainable one. This change from conventional to sustainable sources of energy needs to be developed at a considerate pace. One of the various factors that significantly impacts this change is the implementation and the profound analysis of the distributed energy systems (DES). DES are small-scale electric generation units which are located near and utilized by end-users. DES involves both conventional and non-conventional resources and energy storage technologies that maximize the use of local energy resources leading to numerous environmental and economic benefits. Despite having many advantages that are mainly environmental, these systems due to their complexity are difficult to analyze. Moreover, for an effective implementation of DES, it is vital to optimize the system’s design and operation phase. Throughout the years several researchers have optimized various distributed energy systems using different models and algorithms. In this study optimized design of a distributed energy system for an office-building is presented and analyzed. The building is located in Espoo, Finland and it is optimized by using PSS®DE (Power System Simulator for Distributed Energy) – a tool designed by Siemens. This tool assesses and optimize various competing scenarios to ensure the best solution under technical and economic constraints. The primary aim of this study is to minimize the system’s environmental impact (carbon emissions) and system cost expressed through LCoE (Levelized Cost of Energy) while independently meeting all the energy needs (power and thermal) of the building. Based on the simulation results, the proposed solution for the building system meets all the energy demands with zero carbon emissions and with a LCoE of 0.121 eur/kWh. To meet the electrical demand the solution employs Photovoltaic (50 kW) and as well a connection to a wind farm (327 kW) located in the north of Finland. While a thermal system encompassing compression chiller (300 kWth), electric hot water boiler (172 kWth), and geothermal heat pump (192 kWth) is proposed to meet the thermal demand. Moreover, with the proposed size of the thermal system, the system meets approximately 92% of the cooling demand with a very high value of Coefficient of Performance (CoP).
Järvinen, Mika
Thesis advisor
Juhmen, Jaano
distributed energy system, optimization, zero emissions, LCoE
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