Energy and exergy analysis of a double effect absorption refrigeration system based on different heat sources

Kaynaklı, Ömer; Saka, Kenan; Kaynakli, Faruk

doi:10.1016/j.enconman.2015.09.010

Cited by 84 publications

(26 citation statements)

References 22 publications

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“…Table 2 presents the temperature of the components of the system at 12.30 PM. Table 3 shows the thermodynamic properties of each of the points within the cycle, enthalpy, entropy and exergy at 12:30 PM can be slightly compared to that obtained by Omer Kaynakli et al [13] for the different points of the system. The values of the exergy for the two studies are similar.…”

Section: Resultsmentioning

confidence: 97%

“…While the temperature of GI increases, the exergy loss decreases. The lowest exergy loss is obtained for a generator temperature of 150˚C, the maximum temperature for the second effect generator powered by solar energy [13]. Figure 8.…”

Section: Resultsmentioning

confidence: 97%

“…Omer Kaynakli et al [13] investigated the equation temperature of the overall system and its components by conducting a parametric study on heat capacity and exergy destruction of the HPG, coefficient of performance (COP) of the system and mass flow rate of heat sources. R. Maryami et al [14] done a comparative study between the five classes of LiBr/water absorption refrigeration systems to investigate the influence of various operating parameters on the coefficient of performance.…”

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confidence: 99%

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Exergy Analysis of a Double-Effect Solar Absorption Refrigeration System in Ngaoundere

Tenkeng¹,

Wouagfack²,

Tchinda³

2019

WJET

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Solar energy is replacing more and more traditional sources of energy because of the fact that it's also fighting about global warming. This study is based on exergy analysis of a double-effect series flow absorption refrigeration system powered by solar energy in Ngaoundere. The simulation is done on the basis of a half hourly analysis for the first time, from 6.30 AM to 6.30 PM, using water-lithium bromide as working pair. The main parameters for the performance of an absorption cycle, which are the COP and the ECOP, have been analyzed and the results show that this two parameters increase while increasing the temperature of the main generator. The exergy loss of each component of the system and the total exergy loss of the system have been analyzed and their effectiveness calculated, using the first and second law of thermodynamics. The highest exergy loss occurs in the main generator GI and in the absorber, making these components more important in an absorption cycle. This analysis is based on a mathematical model using FORTRAN language. The results obtained may be useful for the optimization of solar absorption refrigeration systems.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

mentioning

confidence: 99%

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Exergy Analysis of a Double-Effect Solar Absorption Refrigeration System in Ngaoundere

Tenkeng¹,

Wouagfack²,

Tchinda³

2019

WJET

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“…Among them, the double-effect schemes have comparatively received more interest, and are, in fact, the most frequently applied in industry [11,12]. Many studies on the double-effect H 2 O-LiBr ARS were conducted by performing energy analyses [13][14][15], exergy analyses [15,16], and exergo-economic analyses [1,17,18]. A special feature of the double-effect ARS is its capability of running in series, parallel, and reverse parallel flow schemes according to the working solution flow through the heat exchangers and generators [11][12][13]19].…”

Section: Introductionmentioning

confidence: 99%

Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

et al. 2019

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This work presents optimization results obtained for a double-effect H2O-LiBr absorption refrigeration system considering the total cost as minimization criterion, for a wide range of cooling capacity values. As a model result, the sizes of the process units and the corresponding operating conditions are obtained simultaneously. In this paper, the effectiveness factor of each proposed heat exchanger is considered as a model optimization variable which allows (if beneficial, according to the objective function to be minimized) its deletion from the optimal solution, therefore, helping us to determine the optimal configuration. Several optimization cases considering different target levels of cooling capacity are solved. Among the major results, it was observed that the total cost is considerably reduced when the solution heat exchanger operating at low temperature is deleted compared to the configuration that includes it. Also, it was found that the effect of removing this heat exchanger is comparatively more significant with increasing cooling capacity levels. A reduction of 9.8% in the total cost was obtained for a cooling capacity of 16 kW (11,537.2 $·year−1 vs. 12,794.5 $·year−1), while a reduction of 12% was obtained for a cooling capacity of 100 kW (31,338.1 $·year−1 vs. 35,613.9 $·year−1). The optimization mathematical model presented in this work assists in selecting the optimal process configuration, as well as determining the optimal process unit sizes and operating conditions of refrigeration systems.

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“…The lowest coefficients of performance are reached by half effect systems. Kaynakli et al (2015) performed energy and exergy analysis on a double effect series flow absorption refrigeration system with water/lithium bromide as working fluid pair. A parametric study is performed to investigate the effect of operation temperatures of the overall system and its components on heat capacity and exergy destruction of the High Pressure Generator (HPG), coefficient of performance (COP) of the system, and mass flow rate of three different heat sources.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic performance analysis of the double effect absorption-vapour compression cascade refrigeration cycle

Cimsit

2018

JTST

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Absorption refrigeration cycles, the developed as an alternative to vapour-compression refrigeration cycles they are not effective at low temperatures. When the absorption and vapour compression cycles are combined as cascade the consumed compressor work can be reduced considerably, but it requires the use of heat energy at low temperature (solar energy, geothermal energy, waste heat). In this study, the absorption part has been designed to improve the performance of absorption-vapour compression cascade cycle as serial flow double effect. The detailed thermodynamic analysis has been made of the double effect absorption-vapour compression cascade refrigeration cycle. For the novel cycle working fluid used R-134a for vapour compression section and LiBr-H 2 O for absorption section. This cycle has been compared with single effect absorption-vapour compression cascade cycle and one stage vapour compression refrigeration cycle. The results indicate that the electrical energy consumption in the novel cycle is 73% lower than the one stage vapour compression refrigeration cycle. Also, the thermal energy consumption in the cascade cycle is 38% lower than the single effect absorption-vapour compression cascade refrigeration cycle. It is found that the the minimum and maximum exergy efficiency occurs in the cooling set and the low pressure generator (LPG) as 21.85% and 99.58%, respectively.

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Energy and exergy analysis of a double effect absorption refrigeration system based on different heat sources

Cited by 84 publications

References 22 publications

Exergy Analysis of a Double-Effect Solar Absorption Refrigeration System in Ngaoundere

Exergy Analysis of a Double-Effect Solar Absorption Refrigeration System in Ngaoundere

Model-Based Cost Optimization of Double-Effect Water-Lithium Bromide Absorption Refrigeration Systems

Thermodynamic performance analysis of the double effect absorption-vapour compression cascade refrigeration cycle

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