Resumen:
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[EN] The water heating consumption of the average European dwelling accounts at this moment for
14.5 %, according to the European Commission, whereas heating and cooling percentage account
for 64.7 %. The European Union, ...[+]
[EN] The water heating consumption of the average European dwelling accounts at this moment for
14.5 %, according to the European Commission, whereas heating and cooling percentage account
for 64.7 %. The European Union, with the introduction of the Nearly Zero Energy Buildings
(NZEB) concept, intends to decrease in a great amount the total energy consumption of the
residential sector acting over the percentage associated to heating. This will have an effect on the
water heating consumption, increasing its consumption percentage.
Therefore, in order to reduce the residential sector consumption and more concretely the
percentage associated to water heating consumption, it will be key the use of highly energy
efficient technologies since it is not possible to reduce the water heating energy consumption by
acting on the demand without the risk of not satisfying the user comfort. In that sense, heat pumps
are a technology of increasing interest. It is considered as renewable when its SPF is above 2.5,
its production does not depend on external factors (as sunlight) and will play a key role in the
cities of the future since it has the capability of acting as a booster from heat distribution networks.
At this moment, the heat pumps available in the market for domestic hot water production using
subcritical cycles are cost-effective but its design does not differ significantly from the used for
heating applications.
In the frame of the European project NEXTHPG, a heat pump system specifically designed for
domestic hot water production with a variable subcooling control was developed. In this work, a
comparison between the energy consumption at the system level of this prototype with a
commercial water-to-water heat pump for domestic hot water production is performed.
The results show a big difference in terms of energy efficiency between both cases. The variable
subcooling case results in a 26.68 % positive energy efficiency difference regarding the
conventional case when compared in their maximum efficiency point. The sizing of the heat
pump-storage tank duality plays an important role since it could lead to an energy efficiency loss
of almost 17 %. These results show clearly the advantages of the innovative heat pump model in
front of the conventional heat pumps used for domestic hot water production.
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Agradecimientos:
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Part of the work presented was carried by Estefanía Hervás Blasco with the financial support of
a PhD scholarship from the Spanish government SFPI1500 x 074478XV0. The authors would
like also to acknowledge the Spanish ...[+]
Part of the work presented was carried by Estefanía Hervás Blasco with the financial support of
a PhD scholarship from the Spanish government SFPI1500 x 074478XV0. The authors would
like also to acknowledge the Spanish MINISTERIO DE ECONOMIA Y COMPETITIVIDAD,
through the project. MAXIMIZACION DE LA EFICIENCIA Y MINIMIZACION DEL
IMPACTO AMBIENTAL DE BOMBAS DE CALOR PARA LA DESCARBONIZACION DE
LA CALEFACCION/ACS EN LOS EDIFICIOS DE CONSUMO CASI NULO with the
reference ENE2017-83665-C2-1-P for the given support and REDUCCIÓN DE LAS
EMISIONES DE CO2 EN LA PRODUCCIÓN DE AGUA CALIENTE A ALTA
TEMPERATURA A PARTIR DE LA RECUPERACIÓN DE CALOR RESIDUAL MEDIANTE
EL USO DE UNA BOMBA DE CALOR with the reference SP20180039.
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