Characterisation of efficiency losses in ground source heat pump systems equipped with a double parallel stage: a case study
| Autor: | G. Arnó, J. J. de Felipe, J. García-Céspedes, Ignasi Herms |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya. SUMMLab - Sustainability Measurement and Modeling Lab |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Energies [Àrees temàtiques de la UPC]
020209 energy Nuclear engineering Borehole Partialisation losses Física::Termodinàmica [Àrees temàtiques de la UPC] 02 engineering and technology Thermal load law.invention law Heat exchanger 0202 electrical engineering electronic engineering information engineering 0601 history and archaeology Parallel stages Bombes de calor 060102 archaeology Renewable Energy Sustainability and the Environment Part-load factor Ranging 06 humanities and the arts Ground source heat pump systems Coefficient of performance Part-load ratio Ground source heat pump Seasonal performance Environmental science Ground loop (electricity) Gas compressor Heat pump |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya instname |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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