Abstract
Nearly two billion air-conditioning (AC) units are currently being used for space cooling worldwide. The majority of these ACs use R134a as the working fluid, a greenhouse gas (GHG) with a global warming potential (GWP) of 1300 kg-CO2-eq. According to the rules set by the world environment safety organizations, the GWP of domestic air-conditioning systems must not exceed 750 kg-CO2-eq. Hence, the R134a must be phased out by 2025, and an alternative refrigerant with similar thermodynamic properties yet low GWP is required. Therefore, the authors have investigated several potential binary/ternary refrigerant blends in this study. Among the studied refrigerants, R445A, R30A, and NPB2 (newly proposed blend: 8% R152a + 92% R1234yf) can reduce 90–99% global warming impact (more than 200 million tonnes of CO2 emission equivalent) caused by the domestic air-conditioning systems every year.
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Abbreviations
- AC:
-
Air-conditioning
- AHRI:
-
Air-conditioning, heating, and refrigeration institute
- COP:
-
Coefficient of performance
- E :
-
Energy or power (kW)
- GWP:
-
Global warming potential (100 years integration) (kg-CO2-eq)
- h :
-
Specific enthalpy (kJ kg–1)
- l v :
-
Latent heat of vaporization (kJ kg–1)
- ṁ ref :
-
Mass flow rate of refrigerant (kg s–1)
- NPB:
-
Newly proposed blend
- S :
-
Entropy (kJ kg–1 K–1)
- T :
-
Temperature (°C)
- TEWI:
-
Total equivalent warming impact (kg eq. CO2 h–1)
- Q̇ :
-
Cooling capacity (kW)
- VCRS:
-
Vapor compression refrigeration system
- W com :
-
Work of compression (kJ kg–1)
- ρ :
-
Density of refrigerant (kg m–3)
- η :
-
Efficiency (%)
- υ :
-
Volumetric flow rate (l s–1)
- con:
-
Condenser
- com:
-
Compressor
- eva:
-
Evaporator
- isen:
-
Isentropic
- p:
-
Power
- ref:
-
Refrigerant
- sub:
-
Subcooling
- sup:
-
Superheating
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Islam, M.A., Rupam, T.H., Hosan, S. et al. Thermodynamic and Environmental Assessment of Low-GWP Alternative Refrigerants for Domestic Cooling. J. Inst. Eng. India Ser. C 104, 377–383 (2023). https://doi.org/10.1007/s40032-023-00927-y
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DOI: https://doi.org/10.1007/s40032-023-00927-y