Thermodynamic assessment of ultra-low-global warming potential refrigerants for space and water heaters

Autor: Emilio López-Juárez, José Gonzálvez-Maciá, Abdelrahman Hussein Hassan, Luis Sánchez-Moreno-Giner
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname
RiuNet: Repositorio Institucional de la Universitat Politécnica de Valéncia
Universitat Politècnica de València (UPV)
Popis: [EN] The current paper studies the most suitable ultra-low-global warming potential (GWP) (GWP < 30) candidates in the market, considering also its grade of flammability and toxicity, for heat pumps employed for different space heating and domestic hot water (DHW) applications. A pre-design thermodynamic model has been developed to evaluate the performance and size limits for any subcritical or transcritical heat pump under certain working conditions. This generic model is based on the pinch point approach, so it does not depend on a certain type of heat exchangers, it only depends on the external working conditions. The results showed that all subcritical ultra-low-GWP, nonflammable, and nontoxic refrigerants considered have either lower coefficient of performance (COP) or volumetric heating capacity (VHC) compared with the reference high-GWP refrigerants R-410A and R-134a. Additionally, the only refrigerants with higher COP, such as R-717 (ammonia) or R-290 (propane), are either extremely flammable or toxic. For the applications need of high water-side temperature lift, the transcritical refrigerants R-744 (CO2) and R-170 (ethane) showed the best performance, regarding both COP and VHC values, of all the refrigerants studied. The refrigerants R-161, R-1270 (propylene), and R-1234yf presented a balanced performance in both space heating and DHW applications. This makes them potential candidates to be employed in subcritical multi-temperature levels heat pumps.
This work was partially supported by the Research and Development Aid Program (PAID-01-17) of the Universitat Politecnica de Valencia for receiving the Research Fellowship FPI-UPV-2017. The authors also would like to acknowledge the financial support provided by the Ministerio de Ciencia, Innovacion y Universidades de Espana for 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" (ENE2017-83665-C2-1-P).
Databáze: OpenAIRE
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