Flow pattern map, heat transfer and pressure drops during evaporation of R-1234ze(E) and R134a in a horizontal, circular smooth tube: Experiments and assessment of predictive methods

Grauso, S.; Mastrullo, R.; Mauro, A.W.; Thome, John R.; Vanoli, Giuseppe Peter

doi:10.1016/j.ijrefrig.2012.07.016

Cited by 88 publications

(22 citation statements)

References 33 publications

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“…The greatest differences took place for in-tube condensation, being heat transfer coefficient of R1234yf lower to those of R134a. Grauso et al [30] found that local heat transfer coefficients of R1234ze and R134a during flow boiling were very similar in a circular smooth tube of 6.00 mm of inner diameter. This paper extends the studies found in literature about R1234yf and R1234ze as R134a alternatives, presenting an experimental drop-in performance comparison in a wide range of operating conditions (evaporation and condensation temperature) in a fully monitored vapour compression plant.…”

Section: Introductionmentioning

confidence: 99%

Drop-in energy performance evaluation of R1234yf and R1234ze(E) in a vapor compression system as R134a replacements

Mota-Babiloni

Navarro-Esbrí

Barragán-Cervera

et al. 2014

Applied Thermal Engineering

212

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This paper presents an energy performance evaluation of two low-GWP refrigerants, R1234yf and R1234ze(E), as drop-in replacements for R134a. Tests are carried out in a monitored vapour compression system combining different values of evaporation and condensation temperature, and without/with the adoption of an internal heat exchanger. The parameters analysed are volumetric efficiency, cooling capacity and COP and they are presented taking R134a as baseline. Results show that without IHX the average volumetric efficiency for R1234yf and R1234ze is 4% and 5% lower compared with R134a. The cooling capacity obtained with R1234yf and R1234ze is reduced, with an average difference of 9% and 30% without IHX, respectively. Also, COP values are about 7% lower for R1234ye and 6% lower for R1234ze than those obtained using R134a. Finally, the use of an internal heat exchanger reduces the COP differences for both replacements.Keywords: Drop-in, energy performance, R1234yf, R1234ze(E), R134a, vapour compression system. Nomenclature

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Section: Introductionmentioning

confidence: 99%

Drop-in energy performance evaluation of R1234yf and R1234ze(E) in a vapor compression system as R134a replacements

Mota-Babiloni

Navarro-Esbrí

Barragán-Cervera

et al. 2014

Applied Thermal Engineering

212

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“…Recently, Li et al [14] discussed how internal surface enhancement can efficiently improve heat transfer under conditions of mixed convection. Grauso et al [15] found that the local evaporation heat transfer coefficient of smooth tubes using R-134a is approximately 15% higher than those of R-1234ze(E) (low global warming potential (GWP) refrigerant), at low vapor qualities for smooth tubes. Del Col et al [16] evaluated the condensation performance of grooved tubes, for low global warming potential (GWP) refrigerants (i.e.…”

Section: Introductionmentioning

confidence: 99%

Comparison of tubeside condensation and evaporation characteristics of smooth and enhanced heat transfer 1EHT tubes

Kukulka

Smith²,

2015

Applied Thermal Engineering

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“…Its ODP is 0 and GWP is 6. S. Grauso and J.R. Thome [2] have done the research on the flow characteristics, heat transfer and pressure drop characteristics of the R1234ze in refrigeration system. Koyama [3] has made experiments to research the best charge of R1234ze in air source heat pump water heater.…”

Section: Introductionmentioning

confidence: 99%

Research on Using Mixed Refrigerant to Replace the Traditional Refrigerant in Air Source Heat Pump Water Heater

Chen¹,

Wang²,

Wu³

et al. 2017

dteees

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Abstract. In this paper, R1234ze and R32 will be mixed in 2 different proportions. And it will be used to make comparative experiments with a traditional mixed refrigerant (R410a) in air source heat pump water heater. By analysis the data of experiments some intuitive charts will be made. The results show that the R1234ze/R32 mixed refrigerant has better performance. It also provides a possibility of using a new mixed refrigerant to replace the traditional one.

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Flow pattern map, heat transfer and pressure drops during evaporation of R-1234ze(E) and R134a in a horizontal, circular smooth tube: Experiments and assessment of predictive methods

Cited by 88 publications

References 33 publications

Drop-in energy performance evaluation of R1234yf and R1234ze(E) in a vapor compression system as R134a replacements

Drop-in energy performance evaluation of R1234yf and R1234ze(E) in a vapor compression system as R134a replacements

Comparison of tubeside condensation and evaporation characteristics of smooth and enhanced heat transfer 1EHT tubes

Research on Using Mixed Refrigerant to Replace the Traditional Refrigerant in Air Source Heat Pump Water Heater

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