Título:
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Characterisation of efficiency losses in ground source heat pump systems equipped with a double parallel stage: a case study
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Autor/a:
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García Céspedes, Jordi; Arnó Pons, Georgina; Herms, Ignasi; Felipe Blanch, José Juan de
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC; Universitat Politècnica de Catalunya. SUMMLab - Sustainability Measurement and Modeling Lab |
Abstract:
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This work focuses on methods to characterise the efficiency losses in existing ground-source heat pump (GSHP) installations under part-load conditions. Efficiency losses were identified and quantified in a GSHP by analysing key parameters measured and recorded by its monitoring system. The heating/cooling production facility comprises a vertical borehole heat exchanger field and a GSHP equipped with a double parallel stage and fixed-speed compressors within. The methodology was based on the EN-14825 standard and other recent works. However, the particularity of having two parallel stages motivated the creation of a modified theoretical approach, since the original methodology was only applicable to single-stage heat pumps. To obtain significant results, minute-resolved data acquired over time periods with almost constant thermal load (quasi-steady state conditions) proved necessary. The study concluded that the coefficient of performance can suffer reductions as high as 9% exclusively due to part-load operation. Most importantly, it demonstrated that the actual capacity of the GSHP as a whole shows an effective reduction ranging between 20% and 24% with respect to the declared capacity of the heat pump alone. Moreover, weekly-averaged data collected during 3 complete cool and warm seasons point to a progressive degradation from the date of commissioning. Finally, Ground Loop Design software (v2016) was used to validate the methodology. Consistent agreement was found between simulated and measured seasonal performance. |
Materia(s):
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-Àrees temàtiques de la UPC::Física::Termodinàmica -Àrees temàtiques de la UPC::Energies -Ground source heat pump systems -Ground source heat pump -Partialisation losses -Seasonal performance -Parallel stages -Part-load factor -Part-load ratio -Bombes de calor |
Derechos:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
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Artículo - Versión presentada Artículo |
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