Analysis and Design of a Solar-Combisystem for High Solar Fraction Canadian Housing with Diurnal and Seasonal Water-Based Thermal Stores

Kemery, Briana Paige

doi:10.22215/etd/2017-11971

Cited by 3 publications

(9 citation statements)

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“…It is possible, however, that the STES sizes examined were simply past the point at which all solar heat could be stored. This is evidenced by Kemery (2017), who simulated the same system with ETC arrays and smaller storage tanks (20-45 m 3 ), and found that with a 41.6 m 2 array, solar fractions increased slightly (only about 1%) with increasing tank size. Kroll and Ziegler (2011) simulate a buried, insulated ground (soil) storage system in Hamburg, Germany, and produce a solar fraction versus storage volume plot consistent with Braun et al (1981) and Sillman (1981).…”

Section: Sizing Seasonal Storage Systems For Housesmentioning

confidence: 89%

“…Further, for some STES systems tank losses may not strongly affect annual performance. In a precursor to this dissertation, Kemery (2017) simulated a combisystem with a well-insulated STES (13.2 RSI). Overall performance results (e.g.…”

Section: Heat Loss From Storage Tanksmentioning

confidence: 99%

“…Simulated seasonal storage systems have often been controlled using simple differential temperature controllers (see Kemery (2017); Wills (2013) and Hugo et al (2010)). These controllers typically have "on-off" conditions based on the temperature difference between the collector outlet and tank bottom.…”

Section: Control Of Seasonal Storage Systemsmentioning

confidence: 99%

“…The tank was sourced by BPK and IBM. The rationale for selecting this tank size and some information regarding its procurement has been documented by Kemery (2017) and by Beausoleil-Morrison et al (2019).…”

Section: Seasonal Storage Tankmentioning

confidence: 99%

“…As the STES tank is well insulated, a ground model is not strictly necessary, as the tank is not overly sensitive to the surrounding ground temperature. In simulations performed during the design phase of CHEeR (Beausoleil-Morrison et al (2019), Kemery (2017)), constant annual boundary temperatures were used, and sensitivity studies showed little difference in annual system performance, even when the constant ground temperature was varied from to 5-25 °C. Similar results were found for this thesis: if a reasonable boundary temperature, such as the annual ambient temperature in Ottawa (7.7 °C for 2017-2018) is applied, the predicted solar fraction is only 1% less than that predicted when applying a ground model.…”

Section: Seasonal Storage Tankmentioning

confidence: 99%

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Seasonal Thermal Energy Storage in Buried Water Tanks for Single Detached Houses

Meister¹

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Seasonal thermal energy storage (STES) could allow solar energy to offset the majority of building energy loads in cold climates. This thesis outlines one of the first long-term, full-scale experimental studies on seasonal storage at the single-detached home scale. A solar thermal system couples a large evacuated tube solar array to both short term thermal storage tanks and a 36 m 3 buried water tank used for seasonal storage. Solar heat stored in these water tanks provides space heating (SH) and domestic hot water (DHW) to an energy-efficient two-storey research house in Ottawa, Canada. Long term experiments are described, including a one-year cycle of the system and long term heat loss monitoring. Results show that the as-built system can meet the majority of the building's SH and DHW loads, achieving a solar fraction of 68%. However, experiments revealed several areas of underperformance. Most prominently, faulty solar collectors limited the system's potential. To assess the true potential of the system, detailed energy models were developed and validated against experimental data. Simulated free of faults and underperforming components, the system has a predicted solar fraction of over 90%. Building simulation is further used to explore improved control and sizing of STES systems for single-detached homes. Control methods and decisions such as variable speed pumping, radiant floor supply temperature modulation, and storage setpoints are explored, among others. In regard to sizing, for the house under study, it is shown that solar fractions over 90% require relatively large (and potentially costly) STES tanks (>30 m 3 ). However, a moderately lower solar fraction of 70-80% may be obtained even with significantly smaller tanks (<10 m 3 ), provided an "oversized" solar thermal array is utilized, which may come at a significantly lower investment cost.Back in a simpler time, I sent Ian (or then, Prof. Beausoleil-Morrison) an email about grad school. He mentioned a little project with a water tank -sounded simple enough! Little did I know the next several years would be one of the most difficult and rewarding periods of my life. Ian, thank you for providing me with this opportunity, and for your patience, guidance and wisdom over these years.I'm lucky to work alongside an incredible group of people within SBES and the BPRC. Thanks to my lab mates, colleagues and friends for the coffee breaks, karaoke nights and games of Catan.

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Section: Sizing Seasonal Storage Systems For Housesmentioning

confidence: 89%

Section: Heat Loss From Storage Tanksmentioning

confidence: 99%

Section: Control Of Seasonal Storage Systemsmentioning

confidence: 99%

Section: Seasonal Storage Tankmentioning

confidence: 99%

Section: Seasonal Storage Tankmentioning

confidence: 99%

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Seasonal Thermal Energy Storage in Buried Water Tanks for Single Detached Houses

Meister¹

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Modelling and Simulation of Seasonal, Solar Driven Sorption Thermal Energy Storage in Cold Climate Residential Application

Kosteniuk

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In this study, a sorption thermal energy storage system was modelled in TRNSYS and integrated with existing building performance models of a single-detached residential dwelling equipped with an array of evacuated-tube solar thermal collectors in Ottawa, Ontario. The proposed sorption system consists of a closed, modular reactor layout and uses a lithium chloride composite-salt-in-porous-matrix/water working pair and an idealized evaporative heat source. Results of a parametric study found that an overall solar fraction of 90% could be achieved for an energy efficient house with 2000 kg of sorbent material and a total system volume of 9.3 m 3 , and a 95.4% overall solar fraction could be achieved with 3000 kg of sorbent and a total system volume of 25.3 m 3 . The sorption system was able to meet an equivalent fraction of the building's energy demands as a 42.1 m 3 sensible STES while taking up only 60% as much volume.iii AcknowledgementsMany thanks to my supervisor Dr. Ian Beausoleil-Morrison for guiding my research, answering countless questions, and making the graduate studies process as painless as possible. I am grateful to all of the Sustainable Buildings and Energy Systems Group members, both past and present, whose research laid the groundwork for this study,

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Experimental Results of a Solar Thermal System with Sensible Storage in a Single Family Residential House

Manser

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Solar thermal systems with diurnal and seasonal storage in residential buildings present a significant opportunity to satisfy space heating and domestic hot water heating loads and reduce fossil fuel consumption. This research focused on the operation and maintenance of a solar thermal system with sensible water-based diurnal and seasonal storage at the Centre for Home Energy Research (CHEeR) in Ottawa Ontario, Canada. A one year long experiment spanning from June 1, 2022, to June 1, 2023, was conducted to determine the solar thermal systems' effectiveness at supplying space and domestic hot water heating using stored solar thermal energy. The solar collection system consisted of a 41.6 m 2 array of high-performance heat pipe evacuated tube solar collectors. The diurnal storage that satisfied domestic hot water demands was a 450 L water tank in the basement of CHEeR. The seasonal thermal storage that served space heating demands via an in-floor radiant heating system was a 36 m 3 storage tank located underground adjacent to CHEeR. The solar thermal system supplied 81.0% of the domestic hot water loads and 87.5% of the space heating loads. Overall, when accounting for pump electrical energy consumption the system operated at a net overall solar fraction of 78.8%. i amazing support when something at CHEeR broke.To Rebecca, Curtis, and the rest of the team at CHEeR: Thank you for laying the foundation that this work has built upon.

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Analysis and Design of a Solar-Combisystem for High Solar Fraction Canadian Housing with Diurnal and Seasonal Water-Based Thermal Stores

Cited by 3 publications

References 8 publications

Seasonal Thermal Energy Storage in Buried Water Tanks for Single Detached Houses

Seasonal Thermal Energy Storage in Buried Water Tanks for Single Detached Houses

Modelling and Simulation of Seasonal, Solar Driven Sorption Thermal Energy Storage in Cold Climate Residential Application

Experimental Results of a Solar Thermal System with Sensible Storage in a Single Family Residential House

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