Heat recovery process in an adsorption refrigeration machine

Chékirou, W.; Boukheit, N.; Karaali, A.

doi:10.1016/j.ijhydene.2016.02.070

Cited by 17 publications

(11 citation statements)

References 50 publications

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“…Although Chekirou et al. evaluated the effect of heat recovery time, they introduced the concept of temperature difference at the end of heat recovery, δ T r , as shown in Figure . The conclusion that as δ T r becomes small the COP increases is self‐evident and far from practical applications because the cycle time increases as δ T r becomes smaller.…”

Section: Resultsmentioning

confidence: 99%

“…The improvement in the heat recovery system can be estimated by using the coefficient of regeneration, r , which is defined by r = Q r / Q in. For ideal heat recovery, r =1, whereas without heat recovery, r =0. For a cycle time of 840 s, a heat recovery time of 60 s and a hot‐water temperature of 80 °C, the optimal coefficient value of regeneration, showing the highest COP, is r =0.26.…”

Section: Resultsmentioning

confidence: 99%

“…Chekirou et al. reported r =0.29, but a direct comparison was not possible because a different adsorbent pair was used, and there was no information about the heat recovery time and cycle time reported.…”

Section: Resultsmentioning

confidence: 99%

“…Chekirou et al. estimated the performance of an adsorption cooling machine by using activated carbon–methanol as the working pair, and showed that the COP was increased to 0.682, compared with 0.483 without heat recovery …”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on the Combined Heat and Mass Recovery Adsorption Cooling Cycle

et al. 2017

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A numerical simulation of the performance of a fin‐tube‐type adsorption bed with silica gel/water working pairs was conducted. Three models of the heat recovery cycle, the mass recovery cycle, and a combined heat and mass recovery cycle were closely examined. The main goals were to determine 1) the conditions under which these advanced cycles were most effective and 2) the optimum recovery time. Mass recovery enhanced both the coefficient of performance (COP) and specific cooling power (SCP) by up to 24 and 37.5 %, respectively, at 60 °C, and the enhancements of the COP and SCP were 5.0 and 16.0 %, respectively, at 90 °C. Heat recovery increased the COP by 12.56 %, but reduced the SCP by 10.84 % at 60 °C, whereas, at 90 °C, the COP increased by 11.83 % and SCP decreased by 5.96 %. The mass recovery is more influential at a low heating temperature than that at a high heating temperature. Therefore, in the combined heat and mass recovery cycles, the main contribution to the enhancement of the COP comes from mass recovery at lower water temperature. However, at a high heating temperature, the COP increases mainly due to heat recovery.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Study on the Combined Heat and Mass Recovery Adsorption Cooling Cycle

et al. 2017

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“…Due to the fact that the first stage of adsorption unit operation requires heating one adsorber and a second adsorber has to be cooled the whole device has a high potential of the internal energy recovery (Chekirou et al 2016;Qu et al 2001). Heat and mass recovery The recovery of heat and mass is the most common method used in the adsorption equipment to improve energy efficiency ratio EER (Ruciński et al 2016;Rusowicz et al 2014).…”

Section: Internal Energy Recoverymentioning

confidence: 99%

Energy Recovery Methods in Adsorption Refrigeration Units

Grzebielec

Szelągowski

Ruciński

2017

Proccedings of 10th International Conference "Environmental Engineering"

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Abstract. Adsorption refrigeration systems, as opposed to absorption type operate in a cyclic manner. The result is that at the beginning of each process must be fed into the adsorber state in which they will adsorb or desorb a refrigerant. In the case of two adsorbers at the start of a cycle, the one of the adsorber must be refrigerated while the second has to be heated. These processes are causing unnecessary energy loss. The aim of the work is to show how these processes can be connected and the heat received from one adsorber is transported to another adsorber. As part of the study, the heat and mass recovery processes will be considered. It turns out that in the thermal wave type systems, it is possible to recover more than 25% of the energy lost to bring the adsorber to the states in which they will operate efficiently to desorb and adsorb refrigerant. That is, it is possible to improve the efficiency of the adsorption refrigeration unit using the proposed improvements.

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Experimental Investigation of Chilled and Hot Water Inlet Temperature, and Mass Flow Rate Influence on Energy and Exergy Efficiency in a Prismatic Adsorbent Bed Cooling Systems

Shakir,

Ghareeb,

Güngör

2023

Energy Tech

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Adsorption technologies offer a promising solution for managing high electricity demand in building by leveraging waste heat recovery and renewable energy sources. The prismatic adsorbent bed adsorption water cooling system investigates energy and exergy analyses for cooling application. With hot water temperature of 80 °C, cooling water inlet temperature 30 °C, and chilled water inlet temperature 14 °C, the system achieves an energy efficiency of 45.2% while demonstrating an energy storage density of ≈340 kJ kg−1. As a result, the exergy efficiency reaches 12.2%, and the mass fraction at the end of the adsorption process is a significant value of 0.13kgadsorbate/kgadsorbent. Increasing the water mass flow rate in the evaporator results in a decrease in exergy efficiency, while simultaneously causing an increase in energy efficiency. With an increase in the chilled water inlet temperature of the evaporator and the hot water inlet temperature of the adsorbent bed, there is an increase in the energy storage density, energy efficiency, and exergy destruction due to irreversibility and losses. According to this study, the impact of the chilled water inlet temperature on the energy and exergy performances of the evaporator is more significant compared to the effect of the water mass flow rate.

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Heat recovery process in an adsorption refrigeration machine

Cited by 17 publications

References 50 publications

Numerical Study on the Combined Heat and Mass Recovery Adsorption Cooling Cycle

Numerical Study on the Combined Heat and Mass Recovery Adsorption Cooling Cycle

Energy Recovery Methods in Adsorption Refrigeration Units

Experimental Investigation of Chilled and Hot Water Inlet Temperature, and Mass Flow Rate Influence on Energy and Exergy Efficiency in a Prismatic Adsorbent Bed Cooling Systems

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