IIR document
In tube condensation heat transfer and pressure drop for R454B and R32—Potential replacements for R410A.
Author(s) : JAJJA S. A., NAWAZ K., FRICKE B. A.
Type of article: IJR article
Summary
The heating, ventilation and air conditioning (HVAC) industry in the United States seeks near-term alternative refrigerants to replace R-410A in unitary equipment. Two potential replacement refrigerants are R-454B and R-32. It is of interest to investigate the capability and accuracy of existing heat exchanger design methods when applied to these replacement refrigerants. To that end, this work presents empirical condensation quasi-local heat transfer coefficient and pressure drop data for R-454B and R-32. These data were obtained in a in. (9.52 mm) outside diameter (OD) smooth copper tube with a wall thickness of 0.032 in. (0.81 mm). The experimental variables and their ranges included refrigerant absolute pressure ( kPa), condensation temperature ( oC), mass flux ( kg m-2 s-1), vapor quality (), and heat flux ( kW m-2). It was found that the heat transfer correlation developed by Cavallini et al. Cavallini et al. (2006) predicted the experimental condensation heat transfer data, for both R-454B and R-32, with the greatest accuracy. Using the Cavallini et al. correlation, it was found that the mean absolute percentage error (MAPE) was 10.5% and 15.1% for R-454B and R-32, respectively. Additionally, the pressure drop correlation developed by Friedel Friedel (1979) predicted the experimentally determined pressure gradient with a MAPE of 7.7% and 5.5% for R-454B and R-32, respectively. These results will assist the practicing thermal engineer to choose the most appropriate design correlation for these near-term replacement refrigerants.
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Details
- Original title: In tube condensation heat transfer and pressure drop for R454B and R32—Potential replacements for R410A.
- Record ID : 30030451
- Languages: English
- Subject: HFCs alternatives
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 144
- Publication date: 2022/12
- DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.07.019
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Indexing
-
Themes:
HFCs;
HFO et HCFO;
Heat transfer - Keywords: Condensation; Heat transfer coefficient; Pressure drop; R410A; R454B; R32; Expérimentation; Test rig
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