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dc.contributor.authorBrodal, Eivind
dc.contributor.authorJackson, Steven
dc.date.accessioned2019-10-21T08:51:37Z
dc.date.available2019-10-21T08:51:37Z
dc.date.issued2019-08-20
dc.description.abstractHeat pumps used for combined space and hot water heating are often used in modern energy-efficient buildings. Performance depends on both system design (exchanger sizes, compressor efficiency, etc.) and operating conditions (inlet water temperature, ratio between space and water heating, etc.). Designs using both CO2 and HFCs, such as R410A, are available, but the relative performance of these is not extensively studied.<p><p> This article presents performance results based on a system model developed in MATLAB where exchangers are modelled using fixed temperature pinches and pressure drops. Ejectors and compressors are modelled using defined efficiencies. Operating parameters are optimized using the Genetic Algorithm for a set of sensitivity studies. The results show that CO2 can outperform R410A when the ratio of space to water heating is below 0.6 – 1.0, feedwater is below 20°C (as in norther Europe) and heat exchangers are designed with temperature pinches below 10 K.en_US
dc.descriptionAccepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0. </a>".<br> Published version available at: <a href=https://doi.org/10.1016/j.ijrefrig.2019.08.019>https://doi.org/10.1016/j.ijrefrig.2019.08.019</a>en_US
dc.identifier.citationBrodal, E., Jackson, S. A.(2019) Comparative study of CO2 heat pump performance for combined space and hot water heating.<i> International journal of refrigeration, 108</i>, 234-245. https://doi.org/10.1016/j.ijrefrig.2019.08.019en_US
dc.identifier.cristinIDFRIDAID 1719536
dc.identifier.doihttps://doi.org/10.1016/j.ijrefrig.2019.08.019
dc.identifier.issn0140-7007
dc.identifier.issn1879-2081
dc.identifier.urihttps://hdl.handle.net/10037/16438
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalInternational journal of refrigeration
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Technology: 500en_US
dc.subjectVDP::Teknologi: 500en_US
dc.titleA comparative study of CO2 heat pump performance for combined space and hot water heatingen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US


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