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Techno-economic assessment and optimization of seasonal borehole thermal energy storage in district heating networks
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Insinööritieteiden korkeakoulu |
Master's thesis
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en
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71+12
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Abstract
Seasonal thermal energy storage is a promising solution for the decarbonization of the heating sector. It can help to overcome the mismatch between heat demand and renewable energy supply and thus reduce emissions of future thermal energy systems. This thesis investigates the techno-economic performance of borehole thermal energy storage (BTES) systems with district heating integration and optional solar collectors.
A model is developed to simulate the operation of the BTES and the impact of several design parameters is investigated. For the case study of Furuset, a district of Oslo, the techno-economic performance is assessed for different operational conditions. Key performance indicators are the levelized cost of heat (LCOH), CAPEX, required heat pump size, average outlet temperatures, and emissions.
The results implicate that the design parameters impact the performance of the storage system significantly. The mass flow rate within the BTES is a main factor. A mass flow rate that is too high leads to lower outlet temperatures and less heat supplied from the storage, oversizing of the heat pump and thus higher costs and emissions. When the mass flow rate is varied according to the heat demand, the system performance is the best. This case results in a required heat pump capacity of 1.9 MW, average outlet temperatures of 59 °C, CAPEX of 1.7 M€ and LCOH of 141 €/MWh. The emissions considered in this case amount 0.112 kg CO2/kWh, which is 50 % less than if the heat would be supplied by a biogas boiler.
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Supervisor
Ferrantelli , AndreaThesis advisor
Trevisan, SilviaMartin, Andrew