Experimental investigation on the performance of a transcritical CO2 heat pump with multi-ejector expansion system
| Autor: | G. Lillo, G. Boccardi, Francesco Botticella, Rita Mastrullo, Alfonso William Mauro, R. Trinchieri |
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| Přispěvatelé: | Boccardi, G., Botticella, F., Lillo, Gianluca, Mastrullo, RITA MARIA ANTONIA, Mauro, ALFONSO WILLIAM, Trinchieri, R. |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Transcritical cycle
020209 energy Mechanical engineering Thermodynamics 02 engineering and technology law.invention 020401 chemical engineering law Ejector Range (aeronautics) HVAC 0202 electrical engineering electronic engineering information engineering Sensitivity (control systems) 0204 chemical engineering Space heating Heat pump geography geography.geographical_feature_category business.industry Mechanical Engineering Injector Building and Construction Inlet Carbon dioxide Environmental science business Gas compressor |
| Popis: | Carbon dioxide is becoming an interesting option also for HVAC heating appliances due to its eco-friendly characteristics. The incurrence of transcritical cycles makes the use of ejectors attractive to improve performance. Part load conditions and varied ambient temperatures imply the use of variable geometry systems of appropriate design to keep their efficiency high. This paper investigates experimentally a multi-ejector air-to-water CO2 heat pump for heating needs, measuring the performance of the system and of each component under partial and full load conditions. A sensitivity analysis was run varying, separately or in a combined way, the following parameters or operating conditions: ejector area ratio in a range of 33.1–86.6%; compressor frequency in the range of 30–60 Hz; ambient temperature in the range of −15–12 °C according to the standard UNI EN 14511/2011. The results show the possibility to reach an optimum of the COP by varying the ejector area, once the other parameters are fixed, as a consequence of the ejector regulation on the pressures at the inlet and outlet of the compressor. |
| Databáze: | OpenAIRE |
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