共查询到19条相似文献,搜索用时 109 毫秒
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固体吸附式制冷强化传热研究进展 总被引:1,自引:0,他引:1
吸附床的传热强化是影响固体吸附式制冷的主要因素。简述了吸附制冷的强化传热研究进展,介绍了几种常用的吸附床强化传热方法,提出了固体吸附式制冷强化传热的研究方向。 相似文献
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固体吸附式制冷是一种可有效利用低品位热能(太阳能或工业余热等)且对环境无危害的新型制冷技术,介绍了吸附式制冷的基本原理,针对几种常用的吸附工质对,分析了该制冷技术的优势及应用前景。 相似文献
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太阳能固体吸附式制冷系统部件的实物设计 总被引:4,自引:0,他引:4
对太阳能固体吸附式制冰机系统的关键零部件吸附床、冷凝器、蒸发器加以分析,并进行了实物设计。实验结果表明,所设计的系统零部件在太阳能固体吸附式制冰机装置实际运行工况下具有较好的传热、传质特性,系统各子部件间运行时能够很好地匹配,为太阳能制冷空调的实用化奠定了良好的基础。 相似文献
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固体吸附式制冷系统中吸附床内传热的改进及吸附床的设计 总被引:1,自引:0,他引:1
描述了固体吸附式制冷系统中吸附床内传热过程的强化方法。分析比较了两种典型结构的吸附床,并在此基础上设计了一种新型结构的吸附床。 相似文献
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固体吸附式制冷的关键技术研究 总被引:21,自引:6,他引:15
描述吸附容量的D-A方程、吸附床内的传热传质、新型热力循环的潜力与可行性、吸附系统的技术经济性和优化控制、实际吸附循环理论以及双效/多效吸附式制冷等是吸附式制冷尚需进行研究的基础课题。本文对固体吸附式制冷机的关键技术进行了探讨。 相似文献
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Peizhi Yang 《亚洲传热研究》2009,38(8):548-556
In a solid adsorption refrigeration system, the real cycle with non‐equilibrium adsorption is different from the ideal cycle with equilibrium adsorption. To investigate the heat and mass transfer process inside the adsorption bed, a model was established. Mathematical models were then solved by numerical method. The best cycle time of 24 minutes was ascertained through the strategy of SCP priority and paying attention to COP. The influence of the length of adsorption cell tube to the performance of refrigeration system is discussed. © 2009 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20271 Copyright © 2009 Wiley Periodicals, Inc. 相似文献
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《Applied Thermal Engineering》2001,21(16):1643-1656
A practical three-heat-reservoir model for heat-regenerative adsorption air-conditioning system (HAAS) is established on the basis of the working principle of the system and the concept of endoreversible three-heat-reservoir cycle. According to the model, a prototype has been designed and constructed. It is proved by experiments on the prototype that the model is close to real systems in predicting performance of a real system, so it is suitable for representing HAAS and can be taken as a useful tool to guide the design of a real system. Both simulation and experiment prove that the application of HAAS is achievable and beneficial in real use. 相似文献
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《Applied Thermal Engineering》2002,22(6):603-617
A combined cycle capable of heating and adsorption refrigeration is proposed, and the experimental prototype has been installed. The system consists of a heater, a water bath, an activated carbon–methanol adsorption bed and a ice box. This system has been tested with electric heating, and has been found that with 61 MJ heating, the 120 kg water in the bath can be heated up from 22 to 92 °C meanwhile 9 kg ice of −1.5 °C is made. The calculated COPsystem is 0.0591 and COPcycle is 0.41. After reconstruction to a real hybrid household water heater–refrigerator, when 55 MJ heating is added to 120 kg 21 °C water, and the condensing temperature is controlled at about 30 °C, the result is the 4 kg water contained inside the methanol refrigerant evaporator was iced to −2 °C, the cooling capacity of the ice and the refrigerant in the evaporator will maintain the 100 l cold box for about three days below 5 °C. The experiments show the potentials of the application of the solar powered hybrid water heater and refrigerator. Theoretical simulation has been done, which is in good agreement with experimental results. This research shows that the hybrid solar water heating and ice making is reasonable, and the combined cycle of heating and cooling is meaningful for real applications of adsorption systems. 相似文献
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B. Weinberger F. Darkrim Lamari A. Veziroglu S. Beyaz M. Beauverger 《International Journal of Hydrogen Energy》2009
In this work, we discuss the purification of hydrogen by physical adsorption on zeolites Li–LSX exchanged 78%, 83% and 99%. A newly developed adsorption device is applied to the gas–solid adsorption measurements. Isotherms of hydrogen adsorption are gravimetric volumetrically measured at 293.15 K up to 5 MPa. The accuracy of this new device is compared to NIST gas density data's of hydrogen and nitrogen at 293.15 K. Further the real density of the zeolites is obtained by helium skeleton density measurements at high temperature (650 K). The paper provides an interpretation of hydrogen adsorption capacities according to the gas-surface interaction. Further the isosteric heat of adsorption is obtained for the studied materials and analysed in relation to the zeolite cations exchange rate. Moreover, we discuss the influence of the ratio of cation exchange on hydrogen gas adsorption. 相似文献
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A. El Fadar A. Mimet A. Azzabakh M. Pérez-García J. Castaing 《Applied Thermal Engineering》2009,29(5-6):1267-1270
This paper presents the study of solar adsorption cooling machine, where the reactor is heated by a parabolic trough collector (PTC) and is coupled with a heat pipe (HP). This reactor contains a porous medium constituted of activated carbon, reacting by adsorption with ammonia.We have developed a model, based on the equilibrium equations of the refrigerant, adsorption isotherms, heat and mass transfer within the adsorbent bed and energy balance in the hybrid system components. From real climatic data, the model computes the performances of the machine. In comparison with other systems powered by flat plate or evacuated tube collectors, the predicted results, have illustrated the ability of the proposed system to achieve a high performance due to high efficiency of PTC, and high flux density of heat pipe. 相似文献
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Mohammad Ali Ahmadi Seyed Reza Shadizadeh 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(10):1455-1460
Chemical flooding is technically feasible to increase oil recovery from depleted sandstone reservoirs with low pressure. Polymer-surfactant flooding is a potential process in the chemical flooding methods for enhanced oil recovery (EOR) in sandstone porous media. However, chemical additive cost and surfactant loss due to adsorption on the reservoir rock are the main concerns in this type of EOR processes. This paper presents adsorption equilibrium of a natural surfactant, Zyziphus spina-christi, onto a real sandstone reservoir. Batch adsorption experiments were carried out to figure out the impacts of adsorbent dose on adsorption performance. The equilibrium adsorption data were analyzed with two common adsorption models and it was found that the Freundlich model is a pretty good fit for adsorption equilibrium of Z. spina-christi based on the value of determination coefficient (R2). Results from this study are instructive for appropriate selection of surfactants in design of EOR processes and reservoir stimulation plans for sandstone reservoirs. 相似文献
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Irem O. Alp Sezgin Aydin Yasemin O. Ciftci 《International Journal of Hydrogen Energy》2018,43(33):16117-16127
The hydrogen storage (1–10H2) properties of single- and double-side lithium decorated ThMoB4-type graphene (Li/ThMoB4C) are systematically investigated by density functional first-principles calculations within Dmol3 package. After well-converged geometry optimizations, it is found that the binding energy of Li adatom is higher enough, and there is no adatom clustering. The average adsorption energies of 1–6 H2 deviate in 0.20–0.27 eV/H2 range, which is providing a convenient physical adsorption-desorption cycle. A detailed examination of the binding mechanism between the constituents of the H2 adsorbed Li-decorated systems is presented by density of states, Mulliken charge analysis, electron density and density difference calculations. For further decoration and adsorption with 12Li adatom and 72H2 molecules, the computation yields a high gravimetric density of 14.5 wt % with the acceptable adsorption energy. In this way, it is concluded that Li/ThMoB4 system can be considered as a promising hydrogen storage medium. 相似文献