New Fundamental Equations of State with a Common Functional Form for 2,3,3,3-Tetrafluoropropene (R-1234yf) and trans-1,3,3,3-Tetrafluoropropene (R-1234ze(E))

Akasaka, Ryo

doi:10.1007/s10765-011-0992-0

Cited by 54 publications

(30 citation statements)

References 27 publications

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“…Nevertheless, the information on their physical properties has not been reported sufficiently for more specific evaluation. The equation of state was proposed for R1234ze(E) and R1234ze(Z) by Akasaka (2011) and Higashi et al (2014). For 1233zd(E), the thermodynamic properties and a few transport properties were measured by Hulse et al (2012).…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Nagata

Kondou

Koyama

2016

International Journal of Refrigeration

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R1234ze(Z), which has a global warming potential of less than 1, is a promising alternative refrigerant for high-temperature heat pumps designed for heat recovery in the industrial sector. The use of titanium as the material for heat exchangers exposed to acid exhaust is one solution to prevent oxidation. In this study, the pool boiling heat transfer characteristics outside of horizontal titanium tubes were experimentally investigated for R1234ze(Z). A plain tube and three enhanced titanium tubes were tested at saturation temperatures from 10 to 60 °C and heat fluxes from 0.55 to 79.8 kW m-2. Compared to the plain tube, the tested enhanced tube exhibited a 2.8 to 5.1 times higher heat transfer coefficient, on average, in the test range, which could compensate for the disadvantage in the thermal conductivity of titanium. The enhancement ratio predominantly depends on the saturation temperature and the wall heat flux. At conditions of higher saturation temperatures and lower heat fluxes, where smaller bubbles are observed, test tubes with smaller opening width exhibit higher heat transfer coefficients. The experimental results indicate the importance of fin geometry optimization to the operation conditions.

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Section: Introductionmentioning

confidence: 99%

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Nagata

Kondou

Koyama

2016

International Journal of Refrigeration

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“…The cooling capacity of R1234yf used as a drop-in replacement in a HFC-134a refrigerant facility is about 3-12% lower than that presented by HFC-134a in the different range of operating condition [44][45][46]. This difference in the values of cooling capacity obtained with both refrigerants decreases when the condensing temperature decreases and when an IHX is used.…”

Section: Resultsmentioning

confidence: 82%

Thermodynamic Cycle Analysis of Mobile Air Conditioning System Using Hfo-1234yf as an Alternative Replacement of Hfc-134a

Gohel¹,

Kapadia²

2016

Adv Automob Eng

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This paper presents thermodynamic cycle analysis of mobile air conditioning system using HFO1234yf as alternative replacement for HFC-134a. Under a wide range of working conditions (Varying Condensing temperature, Evaporating temperature, Sub cooling and sub heating with Internal heat exchanger (IHX) and without internal heat exchanger) on simple vapor compression system, we compare the energy performance of both refrigerants -R134a and HFO1234yf.Result shows that without using an Internal heat exchanger, At lower condensing temperature (35 o C), Mass flow rate increases about 27-32%, refrigerating effect decreases 22-25%, co mpressor work increases 4-6% and COP decreases about 3-5%.While at higher condensing temperature (55 o C), mass flow rate increases about 35-42%, refrigerating capacity decreases 27-30%, and compressor work increases 8-13% and COP decreases 7-10%.Using an internal heat exchanger (IHX), these differences in the energy performance are significantly reduced.At lower condensing temperature (35 o C), mass flow rate decreases about 18-22%, refrigerating capacity decreases 15-18%, compressor work increases 1-3% and COP decreases about 2-3% and At higher condensing temperature (55 o C), mass flow rate decreases 23-28%, refrigerating capacity decreases 18-22%, compressor work increases 5-8% and COP decreases about 4-7%.The energy performance parameters of HFO1234yf are close to those obtained with HFC-134a at Low condensing temperature and making use of an IHX. Even though the values of performance parameters for HFO1234yf are smaller than that of HFC-134a, but difference is small so it can be a good alternative to HFC-134a because of its environmental friendly properties with introducing IHX.

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“…Typical uncertainties of vapor pressure, liquid density and isobaric heat capacities (liquid and vapor) are 0.2%, 0.5% and 5%, respectively [19]. Then, he presented a new EOS valid for temperatures from 240 K to 420K and for pressures up to 15MPa in the case of R1234ze(E) [20] (and not recommendable for critical region). Average uncertainties are 0.1% in liquid density, 0.2% in vapor density, 3% in liquid heat capacities, 0.05% in the vapor-phase speed of sound, and 0.1% in vapor pressure.…”

Section: R1234ze(e) Purementioning

confidence: 99%

A review of refrigerant R1234ze(E) recent investigations

Mota-Babiloni

Navarro-Esbrí

Molés

et al. 2016

Applied Thermal Engineering

165

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Climate change is demonstrated through global surface temperatures increase in the last century. To stop this phenomenon, new regulations that ban or taxes greenhouse gas fluids (HFC among them) have being approved. In the medium term, only low-GWP refrigerants will be permitted in developed countries. HFO are synthetic fluids that show similar properties to used HFC. Among them, one of the most promising is R1234ze(E). This refrigerant presents good environmental properties and can be used in most of HVACR applications, pure or mixed with HFC or natural refrigerants (mainly CO2). This paper collects the most relevant research about R1234ze(E) thermophysical and compatibility properties, heat transfer and pressure drop characteristics, and vapour compression system performance; separating those works that considers R1234ze(E) pure or blended. Once analyzed literature available, it can be concluded that pure R1234ze(E) is a good option only in new HVACR systems. Nevertheless, if it is combined with other refrigerants also reduces considerably the final GWP value, maintaining efficiency parameters at levels that allow them to replace R134a, R404A or R410A in existing systems with minor modifications.

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New Fundamental Equations of State with a Common Functional Form for 2,3,3,3-Tetrafluoropropene (R-1234yf) and trans-1,3,3,3-Tetrafluoropropene (R-1234ze(E))

Cited by 54 publications

References 27 publications

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E), R1234ze(Z), and R1233zd(E)

Thermodynamic Cycle Analysis of Mobile Air Conditioning System Using Hfo-1234yf as an Alternative Replacement of Hfc-134a

A review of refrigerant R1234ze(E) recent investigations

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