Development of New Low-GWP Refrigerants–Refrigerant Mixtures Including HFO-1123

Hashimoto, Mai; Otsuka, Toshiyuki; Fukushima, Masato; Okamoto, H.; Hayamizu, Hiroki; Ueno, Katsuya; Akasaka, Ryo

doi:10.1080/23744731.2019.1603779

Cited by 31 publications

(9 citation statements)

References 5 publications

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“…Many of the HFCs in use today have no ODP, are non-flammable, recyclable, and energy efficient, but they have high GWP 38 because they are potent greenhouse gases that survive in the atmosphere for many years. Examples of materials R&D to support phasing out HFCs includes computational screening of alternative refrigerants/small molecules, 39 complete experimental characterization of new candidate refrigerants, including determination of thermodynamic properties, 40 heat transfer and pressure drop measurements, 41 and evaluation of cycle performance. 42,43 The US Department of Energy Building Technologies Office has identified highpriority initiatives that would have either a direct effect on maintaining or improving energy efficiency while switching to next-generation low-GWP refrigerants.…”

Section: Vapor Compression Heating and Coolingmentioning

confidence: 99%

Materials research and development needs to enable efficient and electrified buildings

2021

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Because of the complexity of modern buildings—with many interconnected materials, components, and systems—fully electrifying buildings will require targeted R&D and efficient coordination across those material, component, and system levels. Because buildings that consume the smallest amount of energy are easier to electrify, energy efficiency is a crucial step toward fully electrified buildings. Materials advances will play an important role in both reducing the energy intensity of buildings and electrifying their remaining energy use. Materials are currently being explored, discovered, synthesized, evaluated, optimized, and implemented across many building components, including solid-state lighting; dynamic windows and opaque envelopes; cold climate heat pumps; thermal energy storage; heating, ventilating, and air conditioning (HVAC); refrigeration; non-vapor compression HVAC; and more. In this article, we review the current state-of-the-art of materials for various buildings end uses and discuss R&D challenges and opportunities for both efficiency and electrification. Graphical abstract

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Section: Vapor Compression Heating and Coolingmentioning

confidence: 99%

Materials research and development needs to enable efficient and electrified buildings

2021

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“…As such, HFO-1123 is emerging as a new molecule in the refrigeration market, and it is expected to be a next-generation refrigerant for air conditioners. 5 From a chemical point of view, presenting unsaturated C=C bonds, HFOs have low chemical stabilities with a consequent shortening of the atmospheric lifetime that is, in turn, at the basis of the low GWP. This increased chemical reactivity however may cause self-decomposition reactions, and in fact, it has been reported that HFO-1123 undergoes a disproportionation reaction under high-temperature and high-pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

In Vitro and In Silico Vibrational–Rotational Spectroscopic Characterization of the Next-Generation Refrigerant HFO-1123

et al. 2022

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Very short-lived substances have recently been proposed as replacements for hydrofluorocarbons (HFCs), in turn being used in place of ozone-depleting substances, in refrigerant applications. In this respect, hydro-fluoro-olefins (HFOs) are attracting particular interest because, due to their reduced global warming potential, they are supposed to be environmentally friendlier. Notwithstanding this feature, they represent a new class of compounds whose spectroscopic properties and reactivity need to be characterized to allow their atmospheric monitoring and to understand their environmental fate. In the present work, the structural, vibrational, and ro-vibrational properties of trifluorothene (HFO-1123, F 2 C = CHF) are studied by state-of-the-art quantum chemical calculations. The equilibrium molecular structure has an expected error within 2 mÅ and 0.2° for bond lengths and angles, respectively. This represents the first step toward the computation of highly accurate rotational constants for both the ground and first excited fundamental vibrational levels, which reproduce the available experimental data well within 0.1%. Centrifugal distortion parameters and vibrational–rotational coupling terms are computed as well and used to solve some conflicting experimental results. Simulation of the vibrational transition frequencies and intensities beyond the double harmonic approximation and up to three quanta of vibrational excitation provides insights into the couplings ruling the vibrational dynamics and guides the characterization of the gas-phase infrared spectrum experimentally recorded in the range of 200–5000 cm –1 . The full characterization of the IR features is completed with the experimental determination of the absorption cross sections over the 400–5000 cm –1 region from which the radiative forcing and global warming potential of HFO-1123 are derived.

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“…The vapor-liquid equilibrium properties of HFO-1123/ HFC-32 mixtures were evaluated by Miyamoto et al [6]. Hashimoto et al [7] experimentally investigated the thermophysical properties of HFO-1123/HFO-1234yf mixtures and found azeotropic-like behavior. Miyamoto et al [8] measured experimentally the vapor-liquid equilibrium properties of binary blends of HFO-1123 and HFO-1234yf within a limited temperature range of 300.10 K to 329.95 K.…”

Section: Introductionmentioning

confidence: 99%

MD simulation estimation of saturation pressure and vapor-liquid equilibrium for binary blends of HFO-1234yf and HFO-1123

Alam

Jeong

2022

Int. J. Air-Cond. Ref.

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Saturation pressure and vapor-liquid equilibrium data of low GWP hydrofluoroolefin compound HFO-1234yf (2,3,3,3-tetrafluoropropene) and its binary blends with HFO-1123 (1,1,2-trifluoroethene) were estimated using molecular dynamics (MD) simulation with the aid of COMPASS force field from 214.15 K to 330.15 K. The maximum absolute deviations of present saturated vapor pressure data from published experimental results were 0.03% for HFO-1123 system and 0.017% for HFO-1234yf system. These models were used to estimate the saturated vapor pressure for six different mixtures of HFO-1234yf and HFO-1123. The saturated liquid and vapor densities, the vapor-liquid coexistence curve (VLCC), and the critical points of the blended refrigerants with various molecular mass fractions were predicted using MD simulations and Gibbs ensemble Monte Carlo (GEMC) simulations. The critical points of HFO-1234yf and HFO-1123 matched well with published data.

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Development of New Low-GWP Refrigerants–Refrigerant Mixtures Including HFO-1123

Cited by 31 publications

References 5 publications

Materials research and development needs to enable efficient and electrified buildings

Materials research and development needs to enable efficient and electrified buildings

In Vitro and In Silico Vibrational–Rotational Spectroscopic Characterization of the Next-Generation Refrigerant HFO-1123

MD simulation estimation of saturation pressure and vapor-liquid equilibrium for binary blends of HFO-1234yf and HFO-1123

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