Discussion of the feasibility of the Einstein refrigeration cycle

Mejbri, Kh.; Ezzine, N. Ben; Guizani, Y.; Bellagi, A.

doi:10.1016/j.ijrefrig.2005.06.009

Cited by 8 publications

(15 citation statements)

References 8 publications

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“…The system is, therefore, often used in hotel rooms and offices [3] . The absorption diffusion refrigerating machine is designed according to the operation principle of the refrigerating machine mono pressure invented by PLATERN and MUNTER [2][3][4][5][6][7][8][9][10] . This machine uses three operation fluids, water (absorbent), the ammonia (refrigerant) and hydrogen as an inert gas used in order to maintain the total pressure constant.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of an Absorption Diffusion Solar Refrigeration Unit

Chaouachi¹,

Gabsi²

2007

American J. of Applied Sciences

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Abstract:The purpose of this study was the design and the simulation of an absorption diffusion refrigerator using solar as source of energy, for domestic use. The design holds account about the climatic conditions and the unit cost due to technical constraints imposed by the technology of the various components of the installation such as the solar generator, the condenser, the absorber and the evaporator. Mass and energy conservation equations were developed for each component of the cycle and solved numerically. The obtained results showed, that the new designed mono pressure absorption cycle of ammonia was suitable well for the cold production by means of the solar energy and that with a simple plate collector we can reach a power, of the order of 900 watts sufficient for domestic use.

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Section: Introductionmentioning

confidence: 99%

Design and Simulation of an Absorption Diffusion Solar Refrigeration Unit

Chaouachi¹,

Gabsi²

2007

American J. of Applied Sciences

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“…From the analysis, this ammonia solution system has obtained the coefficients of performance (COP) of 0.29, which is 40 per cent more than the analysis done by Delano (0.17) [5] and Mejbri (0.19) [8]. This is because the ammonia solution has lower boiling temperature and has hence increased the mass flow rate and boosted the performance of the bubble pump and the Einstein cycle.…”

Section: Cop =mentioning

confidence: 90%

“…White [7] built a prototype of a bubble pump but operated it with water instead of an ammonia-water mixture. Mejbri et al [8] has evaluated the feasibility of this system using Delano's model to access to two modified configurations. But the vapour-liquid ratio that Delano derived was based on air-lift pump and it was verified using water-only bubble pump.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Measurement of Bubble Pumps and Impact on Single Pressure Absorption Refrigeration Cycle

Chan

McCulloch

2010

2010 IEEE Green Technologies Conference

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Albert Einstein invented a refrigeration cycle nearly eight decades ago. However, neither the cycle, nor a key component -the bubble pump, has been well investigated. In this paper, experimental results for a 20 percent ammonia, 4 bar, solution bubble pump test have been applied to evaluate the Einstein cycle analytically. For a bubble pump temperature of 160 degree C and an evaporator cold temperature of 12 degree C yields coefficient of performance (COP) of 0.29. This COP is 40 percent higher than the COPs that other researchers have obtained using a modified air lift pump model and the water-filled experimental rig. Based on these results, the feasibility of exploiting the cycle as a domestic air conditioning system is more economically viable. Abbreviation and SymbolsCOP Coefficient of performance P Pressure Q Heat flow R Ideal gas constant T Temperature V Volume a, b, c Coefficients of the Petal-Teja EOS Subscripts bp bubble pump c condenser e evaporator g generator

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“…For air-conditioning applications, the optimum conjugate pair of solute/solvents must show LCST behavior at a temperature range of 50-60 C [9]. For air-conditioning applications, the optimum conjugate pair of solute/solvents must show LCST behavior at a temperature range of 50-60 C [9].…”

Section: System Descriptionmentioning

confidence: 99%

Performance assessment of a liquid-phase separation refrigeration cycle

Darwish

Gadalla

2011

Int. J. Energy Res.

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SUMMARY Absorption refrigeration cycles are alternatives to conventional vapor‐compression cycles in which the energy required for refrigeration is provided by heat instead of mechanical work. In this paper, a novel refrigeration cycle utilizing the immiscible liquid‐phase separation behavior is simulated and analyzed using Aspen simulator. The two conjugate liquids adopted in this work are triethylamine (solute) and water (solvent). This binary system has a low critical solution temperature of 18 °C. The thermophysical properties of the binary mixture are generated using the universal functional activity coefficient (UNIFAC) and the nonrandom two‐liquid (NRTL) models. The phase splitting phenomenon at the generator temperature is predicted by both models. However, in comparison with the available experimental data for the same binary mixture, NRTL model gives better predictions for the flow rates and compositions of the material streams. Heat duties of the evaporator, absorber, and generator and the power consumption of the solution pump have been calculated using UNIFAC and NRTL models. The cycle COP that plays a major role in determining the cycle economical viability has been predicted for different operating conditions using the two models. Simulation results show that, for a waste heat reservoir at 60 °C and using NRTL model, the COP is about 2.0. Second law analysis conducted for all cycle components of the cycle shows that about 42% of the total exergy destructed occurs in the generator. Finally, the liquid‐phase separation refrigeration cycle is predicted to be a promising cycle in the near future because of hardware and energy savings. Copyright © 2011 John Wiley & Sons, Ltd.

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Discussion of the feasibility of the Einstein refrigeration cycle

Cited by 8 publications

References 8 publications

Design and Simulation of an Absorption Diffusion Solar Refrigeration Unit

Design and Simulation of an Absorption Diffusion Solar Refrigeration Unit

Analysis and Measurement of Bubble Pumps and Impact on Single Pressure Absorption Refrigeration Cycle

Performance assessment of a liquid-phase separation refrigeration cycle

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