Experimental investigation on composite adsorbent – Water pair for a solar-powered adsorption cooling system

Zhu, Longqian; Tso, Chi Yan; Chan, Ka Chung; Wu, Chili; Chao, Christopher Yu Hang; Chen, J.; He, Wei; Luo, S.W.

doi:10.1016/j.applthermaleng.2017.12.053

Cited by 47 publications

(16 citation statements)

References 48 publications

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“…Refrigeration and air conditioning systems are major consumers of electricity for heating and cooling demands [1]. ese machines use CFCs for their operation which causes the depletion of the ozone layer [2].…”

Section: Introductionmentioning

confidence: 99%

“…ese machines use CFCs for their operation which causes the depletion of the ozone layer [2]. In this context, the use of renewable energies as an alternative to fossil fuels is becoming increasingly essential [1,3]. Nowadays, adsorption heat pump (AHP) has received much attention as a sustainable energy solution using environmentally friendly refrigerants such as water, methanol, and ammonia [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Simulation of Combined Heat and Mass Transfer in Zeolite SAPO‐34 Coating for an Adsorption Heat Pump

Amari

Chahbani

2021

Advances in Materials Science and Engineering

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Heat and mass transfers inside an adsorbent bed of an adsorption heat pump (AHP) are considered poor; consequently, they can cause low system performance. They should be enhanced so as to increase the coefficient of performance of the cooling machine. The aim of this work is to study an adsorbent bed coated with the zeolite SAPO-34. A simulation model based on governing equations for energy, mass, and momentum transfers is developed using COMSOL Multiphysics software. The system zeolite SAPO-34/water has been considered. Modeling results are validated by experimental database available at the Institute for Advanced Energy Technologies “Nicola Giordano,” Italy. It has been shown that the adsorption heat pump performance is affected by both heat and mass transfer. The enhancement of heat transfer solely is not sufficient to attain high values of specific cooling power. In the case of water vapor/SAPO-34 pair, mass transfer has a significant impact on the duration of the cooling step which should be shortened if one would want to increase the specific cooling power. The sole way to do it is to enhance mass transfer inside porous adsorbent.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Combined Heat and Mass Transfer in Zeolite SAPO‐34 Coating for an Adsorption Heat Pump

Amari

Chahbani

2021

Advances in Materials Science and Engineering

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“…70°C waster heat source can be recovery by a cascaded adsorption cycle with five different working pairs for low‐temperature (−8°C) cooling . Besides, preheating/cooling operations are also chosen to improve the system performance by introducing hot and cooling water into absorber and desorber, respectively. Fukai group of Kyushu University designed an open‐loop steam generation system using zeolite‐water working pair.…”

Section: Introductionmentioning

confidence: 99%

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄

Zhang

Xue

et al. 2020

Int J Energy Res

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Adsorptive heat transformer is a promising technology for waster heat recovery and global energy conservation. A novel cyclic adsorption heating system based on direct contact heat exchange method has been established for the purpose of high-temperature steam generation from hot water. Pre-adsorption is originally proposed before generation phase to enhance the system performance with composite zeolite 13X and MgSO 4 in the open-loop adsorption heating system. Composite zeolite is prepared by impregnation method. Experimental results show steam with temperature higher than 200 C is generated from inlet water at 72.0 C. During regeneration phase, dry air at 130 C and relative humidity of 7.37% is employed. Gross temperature lift is 95.0 C to 103 C for different pre-adsorption conditions. The effective steam generation time with pre-adsorption temperature at 90.0 C is prolonged by 27.4%. Meanwhile, the mass of steam is elevated by 16.2% compared with the cycle without pre-adsorption. Exergy coefficient of performance is upgraded by 14.7% and specific heating power for steam generation is increased by 16.0%. The preadsorption operation achieved the goal of recovery of low-grade waste steam on adsorbents to enhance the subsequent high-temperature steam generation. After pre-adsorption operation, the packed bed reaches adsorption and thermal equilibrium more quickly during generation phase. Thus, dynamic steam generation is significantly intensified and then system performance is improved correspondingly. K E Y W O R D S adsorption heating, composite adsorbents, pre-adsorption, steam generation | INTRODUCTIONGlobal primary energy consumption in 2018 grew at a rate of 2.9% which is twice as much as the 10-year average. China together with the US and India accounted for more than two-thirds of the global increase in energy demand. Particularly energy-intensive industries such as the steel industry occupied a quarter of China's energy consumption and greatly dampened overall energy growth. 1 However, 15% to 40% of energy investment in China was dissipated as waste heat to the atmosphere in industrial sectors like cement, iron and steel, and glass in

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“…Detailed descriptions of adsorption heat pumps and their thermodynamic functioning are reported in the literature [6,7,8]. In the last few years, a new interest in this application grew due to the attractive possibility of coupling an adsorption heat pump to solar cells in order to produce air-conditioning for homes and offices by solar energy [9,10,11]. The commercial development of heat pumps and chillers is, however, related to the availability of materials and systems that can compete in terms of performance and cost with the traditional, electrically-driven heat pumps.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Zeolite SAPO-34 Fibres Made by Electrospinning

et al. 2018

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A new generation of compressor-free heat pumps based on adsorption technology and driven by solar energy is available. Performance and costs are, however, the main obstacles to their commercial diffusion, and more material and system developments are required. In this work, a new coating made of microfibres produced by the electrospinning of polymer/zeolite mixtures is presented. Three different polymer carriers, polyvinyl acetate, polyethylene oxide and polystyrene, have been used together with zeolite SAPO-34 as an adsorbing material. Electrospun microfibres showed a mean diameter ranging from 0.75 μm to 2.16 μm depending on the polymer carrier, with a zeolite content from 60 wt.% to 87 wt.%. Thermal analysis (TGA-DSC) results showed that water desorption from microfibres at T = 150 °C was close to 17 wt.%, a value in agreement with the adsorption capacity of pure SAPO-34. The morphology characterization of coatings demonstrated that the microfibre layers are highly porous and have an elevated surface area.

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Experimental investigation on composite adsorbent – Water pair for a solar-powered adsorption cooling system

Cited by 47 publications

References 48 publications

Modeling and Simulation of Combined Heat and Mass Transfer in Zeolite SAPO‐34 Coating for an Adsorption Heat Pump

Modeling and Simulation of Combined Heat and Mass Transfer in Zeolite SAPO‐34 Coating for an Adsorption Heat Pump

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄

Hybrid Zeolite SAPO-34 Fibres Made by Electrospinning

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Experimental investigation on composite adsorbent – Water pair for a solar-powered adsorption cooling system

Cited by 47 publications

References 48 publications

Modeling and Simulation of Combined Heat and Mass Transfer in Zeolite SAPO‐34 Coating for an Adsorption Heat Pump

Modeling and Simulation of Combined Heat and Mass Transfer in Zeolite SAPO‐34 Coating for an Adsorption Heat Pump

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO 4

Hybrid Zeolite SAPO-34 Fibres Made by Electrospinning

Contact Info

Product

Resources

About

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO ₄