Low GWP refrigerants condensation inside a 2.4 mm ID microfin tube

Diani, Andrea; Campanale, Manuela; Cavallini, Alberto; Rossetto, Luisa

doi:10.1016/j.ijrefrig.2017.11.011

Cited by 39 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the test section for the microfin tube was deemed verified. More details can be found in Diani et al [12].…”

Section: Single-phase Resultsmentioning

confidence: 99%

“…Being one of the possible direct drop in replacements of R134a in the near future, the performance of R513A is compared against that of R134a. Heat transfer coefficients during R134a condensation inside a microfin tube with an inner diameter at the fin tip of 2.4 mm are borrowed by Diani et al [12]. The comparison can start by comparing the different thermophysical and transport properties of the two fluids.…”

Section: Comparison Among Refrigerantsmentioning

confidence: 99%

See 1 more Smart Citation

Condensation of an Azeotropic Mixture inside 2.5 mm ID Minitubes

Diani

Rossetto

2020

Fluids

Self Cite

View full text Add to dashboard Cite

The ongoing miniaturization of air conditioning and refrigeration systems, in order to limit, as much as possible, the refrigerant charge, calls for smaller and smaller heat exchangers. Besides, the new environmental regulations are calling for new pure refrigerants or refrigerants mixtures with lower values of global warming potentials (GWPs). In this context, this paper analyzes the possible implementation of minitubes during condensation of the azeotropic mixture R513A. Two minitubes are tested: a smooth tube with an inner diameter of 2.5 mm, and a microfin tube with an inner diameter at the fin tip of 2.4 mm. The effects of vapor quality (varied in the range 0.10–0.99), of mass velocity (varied in the range 200–1000 kg m−2 s−1), and of saturation temperature (30 °C and 40 °C) on the heat transfer coefficient are investigated. The experimental results indicate that the heat transfer coefficient increases as both vapor quality and mass velocity increase, both in the case of the smooth tube and of the microfin tube, but the slope of the heat transfer coefficient trend respect to vapor quality is higher in the case of the microfin tube. The microfin tube shows, on average, heat transfer coefficients are 79% higher than those of the smooth tube under the same working conditions. Since R513A is a possible substitute of R134a, some experimental data during condensation heat transfer are also compared against those for R134a. Finally, the experimental results are compared against values estimated by empirical correlations available in the open literature.

show abstract

“…Therefore, the test section for the microfin tube was deemed verified. More details can be found in Diani et al [12].…”

Section: Single-phase Resultsmentioning

confidence: 99%

Section: Comparison Among Refrigerantsmentioning

confidence: 99%

Condensation of an Azeotropic Mixture inside 2.5 mm ID Minitubes

Diani

Rossetto

2020

Fluids

Self Cite

View full text Add to dashboard Cite

show abstract

“…Andrea et al (2018) [28] investigated low GWP refrigerants condensation inside a 2.4 mm ID microfin tube. The refrigerants include R134a, R1234yf and R1234ze(E).…”

Section: Condensationmentioning

confidence: 99%

Extending ORNL HPDM Capabilities for Design and Optimization of New Refrigerant Blends – FY18 1st Quarterly Milestone: Perform literature review to collect heat transfer, pressure drop correlations and compressor mapping method for alternative refrigerants

Shen

2017

View full text Add to dashboard Cite

“…According to the analysis, R1234yf is the most suitable alternative refrigerant [15]. Diani et al (2018) experimentally examined the heat transfer coefficients and pressure changes during condensation of R1234ze and R1234yf in a micro-tube. The study showed that the heat transfer coefficient of R1234ze is close to R134a, while R1234yf has lower values [16].…”

Section: Introductionmentioning

confidence: 99%

“…Diani et al (2018) experimentally examined the heat transfer coefficients and pressure changes during condensation of R1234ze and R1234yf in a micro-tube. The study showed that the heat transfer coefficient of R1234ze is close to R134a, while R1234yf has lower values [16]. Bolaji et al (2019) theoretically studied the energy potential of R430A, R440A, and R450A, which could replace R134a in a vapour compression system.…”

Section: Introductionmentioning

confidence: 99%

Numerical energy and exergy analysis of cooling systems: low GWP alternative refrigerants (R450A and R1234ze) to R134a

Yildirim

Kumaş

Akyüz

2021

International Journal of Energy Applications and Technologies

View full text Add to dashboard Cite

The use of new generation refrigerants in heating and cooling systems operating according to vapor compression cycles and the preference of renewable energy sources is very important to reduce the negative effects on the environment. Here, the energy and exergy performance of refrigerant R450A and R1234ze, which are alternatives to R134a, were theoretically examined. Energy and exergy analysis of cooling system were performed under the same working conditions (source temperature is between -15 and 15 o C, and heat sink temperature is constant 30 o C). The COP values of R134a, R1234ze, and R450A were 2.00, 1.98 and 1.97, respectively, while the heat source temperature was -15 o C. The heat source temperature was 15 o C, the COP values of R134a, R1234ze, and R450A were 4.82, 4.83 and 4.79, respectively. Under the given operating conditions, the highest total exergy destruction occurred at R134a, while the lowest total Exergy destruction occurred at R1234ze. The refrigerant with the highest and lowest cooling capacity was R134a and R1234ze. According to the results obtained from the analysis, it was concluded that R450A and R1234ze can be used instead of R134a.

show abstract

Low GWP refrigerants condensation inside a 2.4 mm ID microfin tube

Cited by 39 publications

References 26 publications

Condensation of an Azeotropic Mixture inside 2.5 mm ID Minitubes

Condensation of an Azeotropic Mixture inside 2.5 mm ID Minitubes

Extending ORNL HPDM Capabilities for Design and Optimization of New Refrigerant Blends – FY18 1st Quarterly Milestone: Perform literature review to collect heat transfer, pressure drop correlations and compressor mapping method for alternative refrigerants

Numerical energy and exergy analysis of cooling systems: low GWP alternative refrigerants (R450A and R1234ze) to R134a

Contact Info

Product

Resources

About