Experimental investigation of the effect of LiBr on the high-pressure part of a ternary working fluid ammonia absorption refrigeration system

Xu, Mengkai; Li, Shuhong; Jin, Zhi-jiang; Jiang, Weixue; Du, Kai

doi:10.1016/j.applthermaleng.2020.116521

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…5. 10 represents the absolute deviation between the results obtained by experimental measurement [26] and the results obtained by simulation using the calculation model proposed in this paper. According to fig.…”

Section: Comparison Of Experimental Results and Simulation Resultsmentioning

confidence: 99%

Simulation research on absorption refrigeration system based on NH3-H2O-LiBr vapor-liquid equilibrium calculation model

Wang

et al. 2022

THERM SCI

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In order to investigate the ammonia + water + lithium bromide absorption refrigeration cycle process and to simulate it accurately, a vapor-liquid equilibrium calculation model was proposed to obtain thermodynamic characteristic data of the ternary mixtures. The calculation of parameters of liquid phase is based on Wilson?s equation and NRTL equation. The vapor phase, assumed to consist of ammonia and water only, is described by The Redlich-Kwong Equation of State. The data of the equilibrium vapor pressure and the ammonia concentration in liquid phase calculated by this model was compared with the experimental data, the difference is between 0.5% to 9.6% within the temperature range from303 K to 425 K. The COP obtained by the simulation matches with that obtained by experiment and the absolute deviation is less than 0.02. Therefore, this calculation model can be used for simulation to extend the temperature range and pressure range of the system, so as to determine the design parameters of the absorption refrigeration system. The simulation results indicates that under different working conditions, the optimal generator temperature and concentration of adding lithium bromide can be selected, to which the theoretical explanations were given in this paper.

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Section: Comparison Of Experimental Results and Simulation Resultsmentioning

confidence: 99%

Simulation research on absorption refrigeration system based on NH3-H2O-LiBr vapor-liquid equilibrium calculation model

Wang

et al. 2022

THERM SCI

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“…For example, high NH 3 pressure is required when NH 3 is used as a refrigerant in heat pumps. [9][10][11] Although NH 3 has great potential as a refrigerant due to its low density and excellent heat and mass transfer properties, the use of NH 3 under high pressures requires an adsorbent with high NH 3 adsorption capacity and strong structural durability, which cannot be obtained with conventional adsorbents such as zeolite, activated carbons, and metal halide salts. In addition, efficient NH 3 adsorbents that can operate at atmospheric pressures are necessary for energy conversion systems, such as fuel cells using NH 3 directly or H 2 generated from NH 3 .…”

Section: Introductionmentioning

confidence: 99%

Metal–organic frameworks for NH₃ adsorption by different NH₃ operating pressures

Bae

Jeon

et al. 2022

Bulletin Korean Chem Soc

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NH3 has been used in wide applications, such as fertilizers, hydrogen sources, and working fluids, where proper NH3 adsorbents are required to minimize human health risks in daily NH3 exposure as well as to achieve energy efficiency in energy conversion systems. As NH3 operating pressure differs from each usage, the structure and properties of the NH3 adsorbent need to be optimized in each NH3 operating pressure. Metal–organic frameworks (MOFs) have emerged as promising NH3 adsorbents, which would be customizable for different NH3 pressures due to great structural tunability. We introduce up‐to‐date reports with MOFs as NH3 adsorbents and classify them by the NH3 pressure, from high in adsorption heat pumps to extremely low in daily life sensing. MOFs with high NH3 adsorption capacity and durability are suggested in different NH3 pressure ranges, and their structural factors are discussed to help design high‐performance MOFs for NH3 adsorption in different NH3 pressures.

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“… 8 In addition, ammonia has become a great candidate as a working fluid in adsorption heat pumps (AHPs). 1 , 4 , 9 In contrast to conventional heat pumps that adapt an electrical condenser with hydrofluorocarbon as a refrigerant, environmentally friendly heat sources such as waste heat and solar heat are applied to the AHPs with water, alcohol, or ammonia as working fluid. 10 Ammonia is considered as the most advantageous working fluid for achieving high performance in the AHPs, in terms of its high vapor pressure and mass transfer.…”

Section: Introductionmentioning

confidence: 99%

“…Ammonia has emerged as an alternative tool to realize carbon-free energy conversion. − Ammonia is composed of three hydrogen atoms and one nitrogen atom, and it can be utilized as a potential hydrogen carrier for fuel cells. − Ammonia can be stored and transported more efficiently and safely than hydrogen because of its easy liquefication and high specific mass density of hydrogen atoms . In addition, ammonia has become a great candidate as a working fluid in adsorption heat pumps (AHPs). ,, In contrast to conventional heat pumps that adapt an electrical condenser with hydrofluorocarbon as a refrigerant, environmentally friendly heat sources such as waste heat and solar heat are applied to the AHPs with water, alcohol, or ammonia as working fluid . Ammonia is considered as the most advantageous working fluid for achieving high performance in the AHPs, in terms of its high vapor pressure and mass transfer .…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of MIL-101/Reduced Graphene Oxide Nanocomposites on High-Pressure Ammonia Uptake

et al. 2022

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Ammonia has emerged as a potential working fluid in adsorption heat pumps (AHPs) for clean energy conversion. It would be necessary to develop an efficient adsorbent with high-density ammonia uptake under high gas pressures in the low-temperature range for waste heat. Herein, a porous nanocomposite with MIL-101(Cr)-NH 2 (MIL-A) and reduced graphene oxide (rGO) was developed to enhance the ammonia adsorption capacity over high ammonia pressures (3–5 bar) and low working temperatures (20–40 °C). A one-pot hydrothermal reaction could form a two-dimensional sheet-like nanocomposite where MIL-A nanoparticles were well deposited on the surface of rGO. The MIL-A nanoparticles were shown to grow on the rGO surface through chemical bonding between chromium metal centers in MIL-A and oxygen species in rGO. We demonstrated that the nanocomposite with 2% GO showed higher ammonia uptake capacity at 5 bar compared with pure MIL-A and rGO. Our strategy to incorporate rGO with MIL-A nanoparticles would further be generalizable to other metal–organic frameworks for improving the ammonia adsorption capacity in AHPs.

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Experimental investigation of the effect of LiBr on the high-pressure part of a ternary working fluid ammonia absorption refrigeration system

Cited by 15 publications

References 23 publications

Simulation research on absorption refrigeration system based on NH3-H2O-LiBr vapor-liquid equilibrium calculation model

Simulation research on absorption refrigeration system based on NH3-H2O-LiBr vapor-liquid equilibrium calculation model

Metal–organic frameworks for NH₃ adsorption by different NH₃ operating pressures

Synergistic Effect of MIL-101/Reduced Graphene Oxide Nanocomposites on High-Pressure Ammonia Uptake

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Experimental investigation of the effect of LiBr on the high-pressure part of a ternary working fluid ammonia absorption refrigeration system

Cited by 15 publications

References 23 publications

Simulation research on absorption refrigeration system based on NH3-H2O-LiBr vapor-liquid equilibrium calculation model

Simulation research on absorption refrigeration system based on NH3-H2O-LiBr vapor-liquid equilibrium calculation model

Metal–organic frameworks for NH3 adsorption by different NH3 operating pressures

Synergistic Effect of MIL-101/Reduced Graphene Oxide Nanocomposites on High-Pressure Ammonia Uptake

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Metal–organic frameworks for NH₃ adsorption by different NH₃ operating pressures