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Evaluation of potential benefits and investment strategies of the integrated heating-and-electricity supply system: The case of Chalmers campus

Somadutta Sahoo
Göteborg : Chalmers tekniska högskola, 2017. 93 s. Examensarbete - Institutionen för elektroteknik, Chalmers tekniska högskola, 2017.
[Examensarbete på avancerad nivå]

The aim of the thesis is analysis of Chalmers’ district energy systems i.e. heating and electrical network with the possibility to invest in different energy alternatives with the goal of developing an integrated simulation model of electrical and heating systems to obtain possible synergies between different energy carriers. Possibilities of installation of Heat Pump (HP), Thermal Energy Storage (TES), Combined Heat and Power (CHP) plant, battery and solar PV were analyzed simultaneously and synergy between them was established. HP and CHP provided the opportunity to integrate the heating system with the electricity distribution network. Determination of the maximum capacity of energy alternatives based on their annualized investment cost is part of investigation. An optimization and modeling tool, General Algebraic Modeling System (GAMS) was used to develop a linear programming model to optimize the investments in different energy alternatives with the objective being minimization of total system cost. Sensitivity analysis with different parameters was made in terms of peak energy and energy reduction potential from grid and total cost savings potential on an annual basis. Results from the modeling shows reduction potential in heat peaks and heat energy in the range of 82-87% and 95-97% respectively for almost all of cases considered when energy alternatives are present in Chalmers campus as compared to present situation. Exception was found in the case of high investment cost of 10% and initial investment limitation of 5 million SEK case, where reduction potential of heat peak were 74% and 49% respectively and corresponding reduction potential in heat energy over the year were 89% and 42% respectively. Electricity peak and electrical energy consumed over the year are increased in majority of the cases, but the percentage increase on the electricity side is much less than percentage decrease on the heat side. There is a net decrease in total annual cost in the range of 13-28% with inclusion of energy alternatives i.e. sum of running cost and annualized investment cost is less in presence of energy alternatives under all set of simulation conditions in the present thesis than running cost without the energy alternatives in the present situation. In addition to the above, HPs were recommended investments in all scenarios and sensitivities compared in this analysis. TESs and CHPs were present in most of the scenarios in the same order. Solar PVs make contribution when their prices were reduced by 90% as compared to the price considered in the project. Batteries make negligible contribution when they are available at 10% of present pricing in the presence of solar PVs in the model.

Nyckelord: heat pump, thermal energy storage, combined heat and power, energy

Publikationen registrerades 2018-01-23. Den ändrades senast 2018-01-23

CPL ID: 254824

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