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This is a Experimental Study study.

October 1, 2025

Condensation Heat Transfer and Pressure Drop of Low GWP Refrigerants Within a Horizontal Smooth Tube for High Temperature Heat Pump Applications

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This study examines condensation heat transfer and pressure drop in low GWP refrigerants for heat pumps, indicating efficiency potential.

R1234ze(E) achieves higher heat transfer coefficients and lower pressure drops than R1233zd(E) at varied conditions.
Experiments at saturation temperatures of 40–55°C showed the performance stability of R1233zd(E) is sensitive to mass flux changes.
Predictive models by Wang and Shah provide the most accurate predictions for condensation heat transfer.
Findings support better refrigerant selection, emphasizing energy efficiency in advanced heat pump systems.

Eissa et al. (2025) studied this question.

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