Performance prediction of absorption refrigeration cycle based on the measurements of vapor pressure and heat capacity of H2O+[DMIM]DMP system

Li, Dong; Zheng, Danxing; Nie, Nan; Li, Yun

doi:10.1016/j.apenergy.2012.03.044

Cited by 114 publications

(49 citation statements)

References 23 publications

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“…Nevertheless, it is possible to define it as the ratio of the useful heat flow exchanged to the costly heat flow consumed [1]. For example, in a refrigeration cycle the expression of COP becomes [7][8][9][10][11][12][13][14][15][16]:…”

Section: Imentioning

confidence: 99%

“…Table 1 lists the most studied ILs in the literature and the thermophysical properties available. Alkylsulfate-and alkylphosphastebased ILs are well known, and their performance in working fluids {H 2 O + IL} was evaluated in different absorption cycles [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: {H 2 O + Ils} Binary Systems In the Literaturementioning

confidence: 99%

“…The binary systems {H 2 O + dialkylimidazolium alkylphosphate}, 1-dimethylimidazolium dimethylphosphate, and 1-ethyl-3-methylimidazolium dimethylphosphate were extensively studied in numerous papers, where not only the data of vapor-liquid equilibria (VLE) but also density, viscosity, heat capacity, and excess enthalpy are available [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][27][28][29]. These data make it possible to simulate the performance of these binary mixtures as working fluids in the absorption refrigeration cycle [7-25, 27, 30].…”

Section: {H 2 O + Ils} Binary Systems In the Literaturementioning

confidence: 99%

“…Due to these disadvantages, which have not been solved properly, the absorption technology has known a very limited expansion [7,8]. That is why heat pump and absorption chiller technologies suffer from lack of suitable working pairs.…”

Section: Introductionmentioning

confidence: 99%

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Are Ionic Liquids Suitable as New Components in Working Mixtures for Absorption Heat Transformers?

Abumandour¹,

Mutelet²,

Alonso³

2017

Progress and Developments in Ionic Liquids

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The working mixture almost exclusively used to operate absorption heat transformers (AHT) is {H 2 O + LiBr} ({H 2 O+N H 3 } can also be used). Unfortunately, both working pairs present some drawbacks: corrosivity, toxicity, crystallization or high working pressure. Ionic liquids (ILs) possess very interesting properties (thermal stability, possible miscibility with water, negligible vapor pressure) that make them good candidates to be used as absorbents in AHT. This paper aims at providing an overview of available thermodynamic data concerning {H 2 O + IL} mixtures that could be used to operate an AHT.

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Section: Imentioning

confidence: 99%

Section: {H 2 O + Ils} Binary Systems In the Literaturementioning

confidence: 99%

Section: {H 2 O + Ils} Binary Systems In the Literaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Are Ionic Liquids Suitable as New Components in Working Mixtures for Absorption Heat Transformers?

Abumandour¹,

Mutelet²,

Alonso³

2017

Progress and Developments in Ionic Liquids

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“…The vapor pressure, heat capacity, and density of the H 2 O+EMISE system were measured and correlated which verified the availability of being used in absorption cycles. Dong et al [20] can be used as a refrigerant in an absorption cycle. The COP of a system utilizing CO 2 /bmimPF6 is much lower than that of a traditional system using the NH 3 + H 2 O pair.…”

Section: A Review Of Ils As Working Fluidsmentioning

confidence: 99%

Overview of Ionic Liquids Used as Working Fluids in Absorption Cycles

Khamooshi

Parham

Atikol

2013

Advances in Mechanical Engineering

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The cycle performance of refrigeration cycles depends not only on their configuration, but also on thermodynamic properties of working pairs regularly composed of refrigerant and absorbent. The commonly used working pairs in absorption cycles are aqueous solutions of either lithium bromide water or ammonia water. However, corrosion, crystallization, high working pressure, and toxicity are their major disadvantages in industrial applications. Therefore, seeking more advantageous working pairs with good thermal stability, with minimum corrosion, and without crystallization has become the research focus in the past two decades. Ionic liquids (ILs) are room-temperature melting salts that can remain in the liquid state at near or below room temperature. ILs have attracted considerable attention due to their unique properties, such as negligible vapor pressure, nonflammability, thermal stability, good solubility, low melting points, and staying in the liquid state over a wide temperature range from room temperature to about 300 ∘ C. The previously mentioned highly favorable properties of ILs motivated us for carrying out the present research and reviewing the available ILs found in the literature as the working fluids of absorption cycles. Absorption cycles contain absorption heat pumps, absorption chillers, and absorption transformers.

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Screening of novel water/ionic liquid working fluids for absorption thermal energy storage in cooling systems

You

Leung

2019

Int J Energy Res

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Absorption thermal energy storage (ATES) is significant for renewable/waste energy utilization in buildings. The ATES systems using ionic liquids (ILs) are explored to avoid crystallization and enhance the performance. Property model and cycle model have been established with verified accuracies. Based on the preliminary screening, seven ILs are found feasible to be ATES working fluids, while four ILs ([DMIM][DMP], [EMIM][Ac], [EMIM][DEP], and [EMIM][EtSO 4 ]) have been selected for detailed comparisons. The coefficient of performance (COP) and energy storage density (ESD) of the ATES using different H 2 O/ILs are compared with H 2 O/LiBr. Results show that the operating temperatures of LiBr are constrained by crystallization, limiting the COPs and ESDs under higher generation temperatures and lower condensation temperatures. With varying T g , [DMIM][DMP] yields higher COPs with T g above 100°C and [EMIM][Ac] yields comparable ESDs (67.7 vs 67.1 kWh/m 3) with T g around 120°C, as compared with LiBr. The maximum COP is 0.745 for [DMIM][DMP]. With varying T c , [DMIM][DMP] yields higher COPs with T c below 38°C and [EMIM][Ac] yields higher ESDs with T c below 33°C, as compared with LiBr. The maximum ESD is 87.5 kWh/m 3 for [EMIM][Ac]. Nomenclature: B i , second virial coefficient of species i, cm 3 /mol; C p,IL , molar heat capacity of ionic liquid, J/(mol•K); f , cycle circulation ratio; H, molar enthalpy, J/mol; h in , inlet specific enthalpy, kJ/kg; h out , outlet specific enthalpy, kJ/kg; m in , inlet mass flow rate, kg/s; m out , outlet mass flow rate, kg/s; m r , refrigerant mass flow rate, kg/s; M s , solution mass, kg; M r , refrigerant mass, kg; p, system pressure, kPa; p S i , saturated vapor pressure of species i, kPa; Q, heat duty, kW; Q e , evaporator heat duty, kW; Q g , generator heat duty, kW; R, universal gas constant, J/(mol•K); T, temperature,°C or K; T a , absorption temperature,°C; T c , condensation temperature,°C; T e , evaporation temperature,°C; T g , generation temperature,°C; V L i , saturated molar liquid volume of species i, cm 3 /mol; V s , solution tank volume, m 3 ; V r , refrigerant tank volume, m 3 ; W, power, kW; W p , power of pump, kW; X i , liquid molar fraction of species i, mol/mol; x, refrigerant mass fraction, kg/kg; x in , inlet refrigerant mass fraction, kg/kg; x out , outlet refrigerant mass fraction, kg/kg; x s , refrigerant mass fraction in the strong solution, kg/kg; x w , refrigerant mass fraction in the weak solution, kg/kg; Y i , vapor molar fraction of species i, mol/mol; α, τ, adjustable parameters of the activity model; η e , electricity generation efficiency; ρ, density, kg/m 3 ; γ i , activity coefficient of species i; Φ i , correction factor of species i; ΔH mix , mixing enthalpy of the solution,

show abstract

Performance prediction of absorption refrigeration cycle based on the measurements of vapor pressure and heat capacity of H2O+[DMIM]DMP system

Cited by 114 publications

References 23 publications

Are Ionic Liquids Suitable as New Components in Working Mixtures for Absorption Heat Transformers?

Are Ionic Liquids Suitable as New Components in Working Mixtures for Absorption Heat Transformers?

Overview of Ionic Liquids Used as Working Fluids in Absorption Cycles

Screening of novel water/ionic liquid working fluids for absorption thermal energy storage in cooling systems

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