Development of a Simplified Method for Optimally Sizing Hot Water Storage Tanks Subject to Short-Term Intermittent Charge/Discharge Cycles

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Stalinski, Danisz




Hot water storage plays a pivotal role in the transition to low carbon energy systems by increasing energy efficiency and allowing a range of non-conventional intermittent energy sources in the energy mix. In the current study, a simple analytical method is developed to optimally size hot water storage tanks using only the system residual heating profile and the following system characteristics: the heat source temperature, the load service temperature, the auxiliary energy price, and the tank's surrounding temperature. Results show that all scenarios with a source temperature of 95°C, a source to load temperature difference of at least 35°C, and an auxiliary energy price of at least 0.105 USD/kWh have associated R2 values of 0.8 or greater, indicating the sizing method is able to predict the optimal storage tank volume with a high degree of confidence. A case study is presented for a hypothetical solar-thermal DHW system in Montréal, Canada.






Carleton University

Thesis Degree Name: 

Master of Applied Science: 

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Thesis Degree Discipline: 

Engineering, Sustainable Energy

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Theses and Dissertations

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