A methodology for the optimal operation of a residential building’s heating system with focus on thermal modelling of GSHPs
Miglani, Somil A.
- Conference Paper
Rights / licenseIn Copyright - Non-Commercial Use Permitted
Ground-source heat pumps (GSHPs) are popular for space heating in residential buildings. These systems typically involve a water/water heat pump (HP) and a Borehole Heat Exchanger (BHE). Certain operating constraints must be taken into account when analysing these systems. For instance, excessive heat extraction from the BHE could lower the ground temperature resulting in low operating efficiency of the HP. Moreover, for older buildings the load-side operating temperature of the HP is much lower than the distribution temperature required by the space heating circuit. Hence, auxiliary technologies such as gas boiler and stratified daily storage tank are needed to fulfil the building's heating demand at the required temperature. This necessitates a systemic analysis of the GSHPs with relevant operational constraints. Traditional approaches focusing on the operation of such systems, provide a fundamental treatment to the GSHPs, often neglecting the thermal behaviour and limitations it puts on the BHE and the HP. This study describes a methodology for integrating the detailed thermal behaviour of a BHE coupled with a HP within an optimization of the operation of a residential building’s heating system. A MILP consisting of a GSHP, a gas boiler and daily thermal storage is described including operating constraints related to the BHE heat extraction and operating fluid temperature. The optimization minimizes the system's operating costs. The temperature levels of heat production and delivery for each technology are added as additional constraints and are managed through the implementation of a stratified storage tank. The methodology is applied to a Swiss residential building. The operation of the BHE is analysed through the evolution of the operating fluid temperatures and the heat extraction from the ground. The effects of the BHE operation on the HP and other system components are thoroughly studied Show more
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PublisherDepartment of Mechanical Engineering, San Diego State University
SubjectBoreholes; Ground source heat pumps; System optimization; System operations
Organisational unit03806 - Carmeliet, Jan / Carmeliet, Jan
NotesConference lecture on 5 July 2017.
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