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Innovative reheat approach of the TES system during the hotel’s standstill operation utilizing a CO2 heat pump/chiller unit

dc.contributor.authorElarga, Hagar Hassan Hassanein Hassan
dc.contributor.authorPardiñas, Ángel Á.
dc.contributor.authorMinetto, Silvia
dc.contributor.authorHafner, Armin
dc.date.accessioned2024-03-01T12:32:13Z
dc.date.available2024-03-01T12:32:13Z
dc.date.created2023-10-19T13:20:37Z
dc.date.issued2023
dc.identifier.citationProceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023 - volume 4en_US
dc.identifier.isbn978-2-36215-058-6
dc.identifier.urihttps://hdl.handle.net/11250/3120672
dc.description.abstractThe implementation of CO2 as a refrigerant is considered one of the solutions to improve the overall building’s energy performance, especially if the heat recovery concept is applied. In this paper, an innovative approach to compensate for the thermal losses of the in-series stratified thermal energy storage (TES) tanks during periods with insignificant Domestic Heating Water (DHW) demands is numerically investigated using Modelica language. The approach adopts a CO2 heat pump/chiller unit with two water-cooled gas coolers and an air-cooled gas cooler in the case of cooling only is required. The flow leaving one of the middle tanks is mixed with the flow leaving the first gas cooler and the mixture is heated up through the second gas cooler to the heating setpoint and circulated back to the TES system. Results have shown improvements in the thermal charging efficiency, while the system COP has reached 5.5 compared to 4.4 if the reheating approach is not adopted. TIL, Modelica Buildings, and Modelica standards libraries were used to develop the model. Keywords: Thermal Energy Storage, CO2, Heat Pump, chiller, Modelicaen_US
dc.description.abstractInnovative reheat approach of the TES system during the hotel’s standstill operation utilizing a CO2 heat pump/chiller uniten_US
dc.language.isoengen_US
dc.publisherIIRen_US
dc.relation.ispartofProceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023 - volume 4
dc.relation.ispartofseriesScience et technique du froid;2023-4
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleInnovative reheat approach of the TES system during the hotel’s standstill operation utilizing a CO2 heat pump/chiller uniten_US
dc.title.alternativeInnovative reheat approach of the TES system during the hotel’s standstill operation utilizing a CO2 heat pump/chiller uniten_US
dc.typeChapteren_US
dc.typePeer revieweden_US
dc.description.versionacceptedVersionen_US
dc.rights.holderThe Authors hold the copyright to the Author Accepted Manuscript. Distributed under the terms of the Creative Commons Attribution License (CC BY 4.0)en_US
dc.source.pagenumber1105-1116en_US
dc.identifier.cristin2186376
dc.source.articlenumber0457en_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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