Abstract ：

3, 3, 3-Trifluoropropene (R1243zf or HFO1243zf) is a promising refrigerant due to the low global warming potential and similar performance to R134a. Ionic liquids 1-ethyl-3-methyl-imidazolium tetrafluorobo-rate ([Emim][BF4]) and 1-butyl-3-methyl-imidazolium tetrafluoroborate ([Bmim][BF4]) are two potential absorbents with appropriate viscosity, good stability and absorption capacity to fluorine containing refrigerants. The phase behavior of refrigerant/ionic liquid mixtures is crucial for their deep applications. In this work, the vapor-liquid equilibrium of R1243zf with [Emim][BF4] and [Bmim][BF4] were measured based on the isochoric saturation method, and the non-random two liquid (NRTL) model was utilized to correlate the experimental results. The effects of different anions and cations on the liquidus molar frac-tion of R1243zf were studied. In addition, the Henry's constants and derived thermodynamic properties (enthalpy, entropy and Gibbs energy) for the two mixtures were calculated. Furthermore, the phase behavior of different HFO refrigerants (R1234ze(E), R1234yf and R1243zf) with [Emim][BF4] were com-pared and analyzed.(c) 2023 Elsevier B.V. All rights reserved.

Keyword ：

[Bmim][BF4] [Emim][BF4] Phase equilibrium R1243zf Thermodynamic property

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Abstract ：

This paper presents a modified sub-cooler vapor-injection (MSV) cycle with an ejector for air source heat pump applications. The added ejector is used to realize two condensation temperatures for the cycle by using its pressure lift ability and effectively improve cycle performance. The cycle performances are evaluated through thermodynamics methods and compared with those of a basic sub-cooler vapor-injection (BSV) cycle. The results show that compared with the BSV cycle, the heating coefficient of performance (COPh), the volumetric heating capacity and the exergy efficiency of the MSV cycle are increased by 10.1%, 6.3% and 14.1% under a typical operating condition, respectively. The COPh of the MSV cycle using three low-GWP substitutes (R1234yf, R1234ze(E) and R32) are compared with R134a. The results indicate that among them, R1234ze(E) is the most promising refrigerant for improving MSV cycle performance while replacing R134a. It can be concluded that the MSV cycle has a better heating performance by the introduction of the ejector, and thus could offer potential benefits for applications in air source heat pumps. © 2022 Elsevier Ltd and IIR

Keyword ：

Air ejectors Air source heat pumps Cooling systems Ejectors (pumps) Heating

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Abstract ：

Due to the very low GWP and good thermodynamic properties, 3, 3, 3-trifluoropropene (R1243zf) was considered as a promising substitute for R134a. The phase behavior of R1243zf with lubricant oils is essential for the optimization of the refrigeration cycle. In this work, the solubility of R1243zf in pentaerythritol tetrahexanoate (PEC6) and pentaerythritol tetraoctanoate (PEC8), which are the two pure components of polyol ester (POE) oil, was determined at temperatures from 278.15 K to 343.15 K and pressures up to 1.0 MPa using isochoric saturation method. The experimental data were regressed by means of non-random two liquid (NRTL) model and Krichevsky-Kasarnovsky (K-K) model, respectively. Both of the two models present good correlation results with the absolute average relative deviations lower than 3.0 %. Moreover, the solubilities of different hydrofluoroolefin refrigerants (R1234yf, R1234ze(E) and R1243zf) in the studied PECs were compared. Results show that the molar fraction of HFOs dissolved in the same PECs follows: R1234ze(E) > R1243zf > R1234yf. In addition, the dissolution thermodynamic properties including the mixing enthalpy, mixing Gibbs energy and mixing entropy of R1243zf in PEC6 and PEC8 were calculated according to experimental solubility data and the NRTL model, and the dissolution process was analyzed. © 2022 Elsevier B.V.

Keyword ：

Dissolution Esters Mixing Refrigeration Solubility Thermodynamic properties

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Abstract ：

In this work, the mutual diffusivities of difluoromethane (R32) and 2,3,3,3-Tetrafluoropropylene (R1234yf) dissolved in Polyalkylene glycol (PAG) lubricant were studied experimentally based on the principle of dynamic light scattering. The pressure range of mutual diffusivity measurement is from 0.1...

Keyword ：

Diffusion dynamique de la lumière Diffusivité mutuelle Dynamic light scattering Lubricant Lubrifiant Mutual diffusivity R1234yf R32

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Abstract ：

基于液相循环法搭建的气液相平衡实验装置，在263.15～323.15 K温度范围内，实验测量了R32+R1234yf和R1234yf+R1234ze(E)二元混合物以及R32+R1234yf+R1234ze(E)三元混合物的气液相平衡数据，利用PRSV状态方程结合WS混合法则和NRTL活度系数模型进行关联拟合，获得二元混合工质的交互参数，并在其基础上预测了三元混合工质气液相平衡性质。计算结果与实验数据对比表明，二元体系R32+R1234yf和R1234yf+R1234ze(E)的压力平均绝对偏差分别为0.71%和0.20%，气相摩尔分数平均绝对偏差均约为0.0016，三元体系R32+R1234...

Keyword ：

方程拟合 混合制冷剂 气液相平衡 实验测量

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Abstract ：

工业生产过程中的固体散料排量大，温度高，对其进行余热回收可显著减少能耗及环境热污染。为梯级回收利用固体散料底层余热，建立了双压有机朗肯循环(ORC)系统，并对比单压ORC系统以R1234ze(E)和R1234yf为工质进行了性能分析，进一步开展了多目标优化。结果表明：高压蒸发压力是影响双压ORC系统性能的关键变量；综合性能与成本，采用R1234yf的单压ORC系统单位净功成本最低，而采用R1234ze(E)的双压ORC系统性能最佳，其最佳净功、系统■效率及热源可用■效率分别为84.939k W,38.811%和93.541%。

Keyword ：

多目标优化 ■分析 双压系统 有机朗肯循环

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Abstract ：

HFO/离子液体是一种非常有潜力的替代性吸收式制冷工质对。本文筛选了一种低黏度离子液体[DEME][TFSI]，并基于等体积饱和法实验系统测量了R1234yf和R1234ze(E)在其中的溶解度。溶解度实验数据对比结果显示：[DEME][TFSI]对R1234yf和R1234ze(E)具有很高的吸收能力，R1234ze(E)在[DEME][TFSI]的溶解度高于R1234yf。利用NRTL方程对R1234yf和R1234ze(E)在[DEME][TFSI]的溶解度实验数据进行了关联，计算结果与实验值的AAD分别为2.1%和0.5%。

Keyword ：

工质对 离子液体 氢氟烯烃 溶解度 吸收式制冷

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Abstract ：

The solid bulk material from industrial production has large displacement and high temperature, so the waste heat recovery for solid bulk material can significantly reduce energy consumption and environmental thermal pollution. Dual-pressure Organic Rankine cycle system is established to cascading recycle the bottom waste heat from the solid bulk material, whose performance is compared with single-pressure ORC system using R1234ze(E) and R1234yf as working fluid respectively, and multi-objective optimization is further carried out. According to the results, the high-pressure evaporation pressure is the key variable that matters the performance of the dual-pressure ORC system. Taking the cost and performance into consideration compressively, the single-pressure system using R1234yf as working fluid has the lowest unit net power cost. The dual-pressure system using R1234ze(E) as working fluid has the optimal performance, and the optimal net power is 84.939 kW, while the optimal system exergy efficiency and available exergy efficiency from heat source are 38.811% and 93.541%. © 2022, Science Press. All right reserved.

Keyword ：

Dual-pressure system; Exergy analysis; Multi-objective optimization; Organic rankine cycle

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Abstract ：

HFO/ionic liquids are potential alternative working pairs for absorption refrigeration. In this work, a low viscosity ionic liquid [DEME][TFSI] was screened, and the solubility of R1234yf and R1234ze(E) in [DEME][TFSI]was measured based on the isochoric saturation method. The experimental data comparison results show that [DEME][TFSI] has a high absorption capacity for both R1234yf and R1234ze(E), the solubility of R1234ze(E) in [DEME][TFSI] is higher than R1234yf. The experimental data of the solubility of R1234yf and R1234ze(E) in [DEME][TFSI] was then correlated by NRTL equation. The AAD between the calculated results form NRTL equation and the experimental values were 2.1% and 0.5% respectively. © 2022, Science Press. All right reserved.

Keyword ：

Absorption refrigeration; Hydrofluoroethylene; Ionic liquid; Solubility; Working pair

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Abstract ：

The solid bulk material from industrial production has large displacement and high temperature, so the waste heat recovery for solid bulk material can significantly reduce energy consumption and environmental thermal pollution. Dual-pressure Organic Rankine cycle system is established to cascading recycle the bottom waste heat from the solid bulk material, whose performance is compared with single-pressure ORC system using R1234ze(E) and R1234yf as working fluid respectively, and multi-objective optimization is further carried out. According to the results, the high-pressure evaporation pressure is the key variable that matters the performance of the dual-pressure ORC system. Taking the cost and performance into consideration compressively, the single-pressure system using R1234yf as working fluid has the lowest unit net power cost. The dual-pressure system using R1234ze(E) as working fluid has the optimal performance, and the optimal net power is 84.939 kW, while the optimal system exergy efficiency and available exergy efficiency from heat source are 38.811% and 93.541%. © 2022, Science Press. All right reserved.

Keyword ：

Energy utilization Exergy Fluids Multiobjective optimization Rankine cycle Waste heat Waste heat utilization

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