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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/58539
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dc.creatorJéssica Cristina Campos Miranda Silvapt_BR
dc.creatorLuiz Machadopt_BR
dc.creatorWillian Moreira Duartept_BR
dc.date.accessioned2023-09-06T23:57:05Z-
dc.date.available2023-09-06T23:57:05Z-
dc.date.issued2022-
dc.citation.issue19pt_BR
dc.citation.spage1pt_BR
dc.citation.epage10pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/58539-
dc.description.resumoThe use of heat pumps to heat water instead of electric heaters is a way to reduce energy consumption and consequently greenhouse gas emissions. In this context, carbon dioxide (CO2 or R744) as a refrigerant fluid has drawn the attention of several researchers in the refrigeration field. Several works in the literature evaluated the performance of the heat pump, economic performance, energy performance, exergy performance, influence of the geometry in the solar evaporator, but no work presents the behavior of the pressure in the evaporator. In this context, this paper presents a mathematical model for the heat pump evaporator (DX-SAHP) that evaluates the behavior of the pressure in the evaporator when it is not operating but exposed to the sun and the impacts of these pressures on the structural integrity of the components, considering an amount of CO2 mass trapped inside the evaporator varying between 8% and 12%. The meteorological data for solving the mathematical model were taken from INMET website for the day with highest solar radiation in 2022. The maximum R744 pressure for 12% mass inside the evaporator was around 10MPa whereas the maximum work pressure recommended by tube manufacture is 13.2MPa.pt_BR
dc.format.mimetypepdfpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA MECÂNICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.rightsAcesso Abertopt_BR
dc.rightsAtribuição 3.0 Portugal*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/pt/*
dc.subjectNumeric modelpt_BR
dc.subjectDX-SAHPpt_BR
dc.subjectPressure in the evaporatorpt_BR
dc.subjectSolar Assisted Heat Pumppt_BR
dc.subjectR744 (CO2)pt_BR
dc.subject.otherEvaporadorespt_BR
dc.titleStudy on the maximum pressures of a solar-assisted R744 direct expansion heat pump for water heatingpt_BR
dc.typeArtigo de Eventopt_BR
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