Experimental comparison of HFO-1234ze(E) and R-515B to replace HFC-134a in heat pump water heaters and moderately high temperature heat pumps
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Título
Experimental comparison of HFO-1234ze(E) and R-515B to replace HFC-134a in heat pump water heaters and moderately high temperature heat pumpsFecha de publicación
2021-09Editor
ElsevierISSN
1359-4311Cita bibliográfica
MOTA-BABILONI, Adrián, et al. Experimental comparison of HFO-1234ze (E) and R-515B to replace HFC-134a in heat pump water heaters and moderately high temperature heat pumps. Applied Thermal Engineering, 2021, 117256.Tipo de documento
info:eu-repo/semantics/articleVersión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Heat pumps are gaining interest to replace fossil fuel burners with the increase of the share of renewable sources
in the electricity generation mix. Moreover, low global warming potential (GWP) alternatives offer a ... [+]
Heat pumps are gaining interest to replace fossil fuel burners with the increase of the share of renewable sources
in the electricity generation mix. Moreover, low global warming potential (GWP) alternatives offer a more
environmentally friendly option as refrigerants. HFO-1234ze(E) and its non-flammable mixture R-515B are
experimentally investigated for the first time to replace HFC-134a in heat pump water heaters (HPWH) and
moderately high temperature heat pumps (MHTHP). Tests are performed in a test rig equipped with a variable
frequency compressor at evaporating temperatures of 7.5, 15 and 22.5 ◦C and condensing temperatures from 55
to 85 ◦C (65 experimental tests). HFC-134a outperforms both alternatives in heating capacity (approx. 26%
higher) due to the higher mass flow rate and heating effect. However, this effect is compensated by, on average,
25% lower compressor power consumption. Therefore, the coefficient of performance (COP) is comparable or
slightly higher (up to 5%) for HFO-1234ze(E) and R-515B. Considering the positive results in COP and the
reduced GWP, both options decrease HFC-134a MHTHP equivalent carbon emissions down to 28%. Besides,
given the 20 K lower discharge temperature reached by the alternatives, the compressor operating map can be
significantly extended. Finally, it is demonstrated that R-515B is a suitable non-flammable alternative to HFO1234ze(E) that keep energetic and environmental benefits while offers a safer system operation. [-]
Publicado en
Applied Thermal Engineering, 2021, 117256Entidad financiadora
Universitat Jaume I | Valencian Government
Código del proyecto o subvención
RTC-2017- 6511-3 | UJI-B2018-24 | APOSTD/2020/032
Derechos de acceso
© 2021 The Author(s). Published by Elsevier Ltd.
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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