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September 3, 2026International Journal of ThermodynamicsOpen Access

Energy, Exergy, and Environmental Assessment of R-152a as a Low-GWP Alternative for R-134a in Domestic Heat Pump Water Heaters for Tropical Countries

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Authors

HAHifni Mukhtar AriyadiZAZaki AbdussalamIPIndro Pranoto

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Overview

Thermodynamic modeling study demonstrates improved efficiency and reduced warming impact for R-152a in domestic heat pump water heaters, indicating strong potential as an eco-friendly refrigerant.

Key Points

  • To assess the thermodynamic performance, exergy efficiency, and environmental impact of R-152a as a low-GWP replacement for R-134a in domestic heat pump water heaters.
  • Conducted a thermodynamic modeling simulation of a domestic heat pump water heater under fixed operating conditions.
  • Modeled parameters including an evaporator temperature of 10°C, a condenser temperature of 50°C, and a water heating capacity of 1.6 m³ across varying compressor efficiencies.
  • R-152a achieved a coefficient of performance (COP) of 6.25 versus 5.99 for R-134a (a 4.3% increase) and lowered the refrigerant mass flow rate by approximately 40% (4.555 g/s vs. 7.595 g/s).
  • Direct Total Equivalent Warming Impact (TEWI) decreased by 91.3% using R-152a (195.3 kg CO2-eq vs. 2252.25 kg CO2-eq for R-134a), corresponding to a lower Global Warming Potential of 124 compared to 1430.
  • Exergy analysis showed consistently higher exergy efficiency for R-152a across all evaluated evaporator temperatures and compressor efficiencies, reflecting lower thermodynamic irreversibility.

Cite This Study

Ariyadi et al. (2026) studied this question.

synapsesocial.com/papers/6a9935b1636c6408cfa7e19ehttps://doi.org/10.5541/ijot.1773781
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