Experimental study of the effect of enhanced mass transfer on the performance improvement of a solar-driven adsorption refrigeration system

Wang, Yun Feng; Li, Ming; Ji, Xu; Yu, Qiongfen; Li, Guoliang; Zhang, Fujun

doi:10.1016/j.apenergy.2018.05.017

Cited by 32 publications

(14 citation statements)

References 44 publications

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“…Various LG heat harvesting technologies have been put forward continually [2][3][4][5]. Among all these feasible proposals, a class of thermally driven refrigerators, mainly including absorption refrigerator [6][7][8], adsorption refrigerator [9][10][11], and ejector refrigerator [12][13][14], are particularly attractive to researchers due to the fact that around 15% of the electricity generated worldwide is consumed by air-conditioning processes [15]. As the promising alternatives of traditional vapor compression refrigerator, thermally driven refrigerators possess the merits of fewer moving parts, low noise, high reliability, low operation cost, long lifetime, adaptability to a wide range of heat source temperatures, and the possibility of using environmentally-friendly refrigerants [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Guo

Yang

Zhang

et al. 2019

Energy Conversion and Management

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In order to investigate the performance of a class of thermally driven refrigerators, usually driven by low-grade thermal energy, a generic thermodynamic model of three-heat-source refrigerator without involving any specific heat-transfer law is put forward by adopting low-dissipation assumptions. Based on the proposed model, the analytical expressions for the coefficient of performance (COP) and cooling power of the system are derived in terms of well-defined dissipation parameters and contact time durations between the system and heat reservoirs. One essential parameter accounting for the size ratio of the two coupled subsystems inside the overall system is introduced in light of the practical meaning of the reversible entropy change. With the help of the aforementioned parameter, the optimal relation between the COP and cooling power is obtained. The optimal operation region and optimal construction of the overall system are further determined for the first time. In addition, the influences of the dissipation and temporal symmetries are discussed in detail, according to which the upper and lower bounds of the COP at maximum cooling power are firstly obtained under two extreme situations. Experimental and simulated data from previous reported works are collected to illustrate the validity and practical significance of the proposed model and associated results. A limit case is presented to highlight the generality of the model.

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Section: Introductionmentioning

confidence: 99%

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Guo

Yang

Zhang

et al. 2019

Energy Conversion and Management

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“…It is known to use such devices to chilled water production in air conditioning systems [5,6]. There are also attempts to use them in food storage that requires low and stable temperatures and for the ice-making in the food industry [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the possibility of increasing the total thermal conductivity of the bed, the beneficial effect of metals and carbon nanotubes has been analyzed in [24,25] as the mixtures with the silica gel as the base sorbent. It is known to use such devices to chilled water production in air conditioning systems [5,6]. There are also attempts to use them in food storage that requires low and stable temperatures and for the ice-making in the food industry [7,8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of an Intensified Heat Transfer Adsorption Bed (IHTAB) Reactor Prototype

et al. 2021

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The first experience in the operation of intensified heat transfer adsorption bed reactor designed for low-pressure adsorption processes is presented in this paper. This work aims to assess the possibility of fluidizing the porous media bed induced by the pressure difference between the evaporator and the adsorption reactor. The conducted experimental research allowed indicating the type of silica gel recommended to use in fluidized beds of adsorption chiller. The fixed bed of silica gel was observed for the lower pressure differences, while fluidization appeared in the case of the pressure difference between the evaporator and the adsorption chamber higher than 1000 Pa. The most significant differences in the adsorption process between the fixed bed and the fluidized bed are revealed in the changes of sorbent temperatures. The silica gel bed was fluidized with water vapor generated in the evaporator.

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“…Wang et al made the performance comparative study of a solar-powered adsorption refrigerator with a CPC collector/adsorbent bed [14]. Wang et al did an experimental study on the effect of enhanced mass transfer on the performance improvement of a solar-driven adsorption refrigeration system [15]. Those systems are possible alternatives to the vapor compression system, not only because they are driven by renewable energy but also because their refrigerants are more environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

Research on Local Heating Regeneration Method for Air-Conditioning Systems

Cheng

2021

Processes

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Absorption air-conditioning systems have a great advantage in terms of energy conservation and environmental protection. However, the large amount of energy waste in the thermal regeneration process leads to lower efficiency and impedes its development. To reduce energy loss and improve performance, a local heating regeneration method is proposed in this paper. The main principle is reducing the volume of the liquid participating regeneration. Including the solar steam mode, two modes are introduced and configured. Theoretical and experimental research has been made on the new methods. Models have been developed for comparison analysis. Experiments have been conducted on water and absorbent solution with different modes. Performance has been evaluated based on the experimental data. The results expose the influence of different parameters, like liquid volume and solution concentration, on the regeneration process. The local heating method improved the regeneration efficiency by 40% in the no solar steam mode and the performance tripled in the solar steam mode. The COP (the ratio of cooling load to energy consumption) of the absorption system with the solar steam mode is more than two times of that with the traditional regeneration mode. It shows the local heating regeneration method has good potential in future application.

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Experimental study of the effect of enhanced mass transfer on the performance improvement of a solar-driven adsorption refrigeration system

Cited by 32 publications

References 44 publications

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Experimental Investigation of an Intensified Heat Transfer Adsorption Bed (IHTAB) Reactor Prototype

Research on Local Heating Regeneration Method for Air-Conditioning Systems

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