Design and Performance of an Innovative Four-Bed, Three-Stage Adsorption Cycle

Rahman, Abul Fazal Mohammad Mizanur; Ueda, Yuichi; Akisawa, Atsushi; Miyazaki, Takahiko; Saha, Bidyut Baran

doi:10.3390/en6031365

Cited by 17 publications

(4 citation statements)

References 25 publications

(27 reference statements)

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“…A detailed dynamic simulation model was used to predict the temperatures of the CPC cover and absorber [6,20,21], adsorption system, and for the performance evaluation [22][23][24][25]. The model was based on mass and energy balance equations.…”

Section: Assumptionsmentioning

confidence: 99%

Performance Evaluation of a Solar Adsorption Refrigeration System with a Wing Type Compound Parabolic Concentrator

2014

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Simulation study of a solar adsorption refrigeration system using a wing type compound parabolic concentrator (CPC) is presented. The system consists of the wing type collector set at optimum angles, adsorption bed, a condenser and a refrigerator. The wing type collector captures the solar energy efficiently in the morning and afternoon and provides the effective temperature for a longer period of time compared to that achieved by a linear collector. The objectives of the study were to evaluate the system behavior, the effect of wing length, and to compare the performance of the systems with wing type and linear CPCs. A detailed dynamic simulation model was developed based on mass and energy balance equations. The simulation results show that the system performance with wing type CPC increases by up to 6% in the summer and up to 2% in the winter, compared to the performance with a linear CPC having same collector length. The ice production also increases up to 13% in the summer with the wing type CPC. This shows that the wing type CPC is helpful to increase the performance of the system compared to the linear CPC with the same collector length and without the need for tracking.

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Section: Assumptionsmentioning

confidence: 99%

Performance Evaluation of a Solar Adsorption Refrigeration System with a Wing Type Compound Parabolic Concentrator

2014

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“…Researchers have applied mathematical simplification to improve the performance prediction for single-and multi-stage adsorption chillers for low grade waste heat; the drawback was low COP and cooling capacity [15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of a Two-Stage Air Cooled Adsorption Chiller with Heat Recovery Part I: Physical and Mathematical Performance Model

et al. 2022

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In the proposed work, the MATLAB program was used to model and simulate the performance of the investigated two-stage adsorption chiller with and without heat recovery using an activated carbon/methanol pair. The simulated model results were then validated by the experimental results conducted by Millennium Industries. The model was based on 10th order differential equations; six of them were used to predict bed, evaporator and condenser temperatures while the other four equations were used to calculate the adsorption isotherm and adsorption kinetics. The detailed validation is stated in the next paragraphs; for example, it clearly notes that the simulation model results for the two-stage air cooled chiller are well compared with the experimental data in terms of cooling capacity (6.7 kW for the model compared with 6.14 kW from the experimental results at the same conditions). The Coefficient of Performance (COP) predicted by this simulation was 0.4, which is very close to that given by the Carnot cycle working at the same operating conditions. The model optimized the switching time, adsorption/desorption time and heat recovery time to maximize both cooling capacity and COP. The model optimized the adsorption/desorption cycle time (300 to 400 s), switching cycle time (50 s) and heat recovery cycle time (30 s). The temporal history of bed, evaporator and condenser temperatures is provided by this model for both heat recovery and without heat recovery chiller operation modes. The importance of this study is that it will be used as a basis for future series production.

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“…In Reference [18], Rahman et al introduced an innovative thermodynamic cycle based on a four-bed layout and three stages which can be powered by low-temperature heat. The mathematical simulations conducted showed that the maximum coefficient of performance of the system can be achieved for a regeneration temperature at 55 • C, while the optimal cycle time was dependent on the corresponding heat source temperature, thus proving the possibility to employ an adsorption chiller for solar applications.…”

Section: Introductionmentioning

confidence: 99%

Performance Results of a Solar Adsorption Cooling and Heating Unit

et al. 2020

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The high environmental impact of conventional methods of cooling and heating increased the need for renewable energy deployment for covering thermal loads. Toward that direction, the proposed system aims at offering an efficient solar powered alternative, coupling a zeolite–water adsorption chiller with a conventional vapor compression cycle. The system is designed to operate under intermittent heat supply of low-temperature solar thermal energy (<90 °C) provided by evacuated tube collectors. A prototype was developed and tested in cooling mode operation. The results from the testing of separate components showed that the adsorption chiller was operating efficiently, achieving a maximum coefficient of performance (COP) of 0.65. With respect to the combined performance of the system, evaluated on a typical week of summer in Athens, the maximum reported COP was approximately 0.575, mainly due to the lower driving temperatures with a range of 75 °C. The corresponding mean energy efficiency ratio (EER) obtained was 5.8.

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Design and Performance of an Innovative Four-Bed, Three-Stage Adsorption Cycle

Cited by 17 publications

References 25 publications

Performance Evaluation of a Solar Adsorption Refrigeration System with a Wing Type Compound Parabolic Concentrator

Performance Evaluation of a Solar Adsorption Refrigeration System with a Wing Type Compound Parabolic Concentrator

Modeling and Simulation of a Two-Stage Air Cooled Adsorption Chiller with Heat Recovery Part I: Physical and Mathematical Performance Model

Performance Results of a Solar Adsorption Cooling and Heating Unit

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