| Autor: |
Sánchez Velasco, Francisco Javier, Haddouche, Mohammed Reda, Illán Gómez, Fernando, García Cascales, José Ramón |
| Přispěvatelé: |
Universidad Politécnica de Cartagena |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Energy and Buildings. 265:112085 |
| ISSN: |
0378-7788 |
| DOI: |
10.1016/j.enbuild.2022.112085 |
| Popis: |
This work presents an experimental study of the dynamic performance of a CO2 water-to-water heat pump in a domestic hot water production system. A facility was developed and used to characterize the time evolution of the COP of this heat pump, the heating and stratification processes of the hot-water storage tank, and the global COP of the system. Results showed that, when heating the water storage tank, strategies based on promoting stratification to reach Ri ∼40, such as the use of vertical tank filling velocities ∼ 10-4 m·s−1 with low water flow rates between the tank and the heat pump gas cooler, permits an increase of ∼12.4% in the system global COP and a reduction of ∼16% of the compressor energy consumption compared to other strategies. However, strategies based on considering higher water flow rates (i.e. Ri ∼1) increase the thermal energy available in the tank (∼6% when flow rate and increases a factor 3.6) but enhance the water mixing and extend the heating time which reduces the global COP of the system. Besides, an increase of the evaporator inlet water temperature from 5 °C to 20 °C increases the system global COP by 59% and reduces the heating time ∼40%. This work has been performed in the context of the project in the project “Maximisation of the efficiency and minimisation of the environmental impact of heap pumps for the decarbonisation of heating and domestic hot water production in nearly zero energy buildings” ENE2017- 83665-C2-2-P, Funded by the Ministry of Economy and Competitiveness, Spain and the support of the European Regional Development Fund. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect