As a type of environmental benign refrigera- tion technology powered by low grade thermal energy, ad- sorption refrigeration have aroused more and more at- tention in recent years. In this paper, the research frontier...As a type of environmental benign refrigera- tion technology powered by low grade thermal energy, ad- sorption refrigeration have aroused more and more at- tention in recent years. In this paper, the research frontiers of adsorption refrigeration, including adsorbent, adsorption theory, heat recovery process, technology of adsorber, the research achievements, and the development achievements, are summarized. Typical systems foradsorption refrigeration research facing to applications in the recent years are pre- sented. Future applications of adsorption refrigeration are analysed.展开更多
A model is established to investigate the thermal wave in adsorption refrigeration by ana1yzing the transient heat transfer in the adsorption bed. Numerical method is adopted. The fluid velocity and the equivalent hea...A model is established to investigate the thermal wave in adsorption refrigeration by ana1yzing the transient heat transfer in the adsorption bed. Numerical method is adopted. The fluid velocity and the equivalent heat transfer coefficient, which mainly infiuence the characteristic of the thermal wave, are discussed. Their influence to the COP and SPD(system power density) is also presented. The key to the thermal wave cycle is to greatly intensify the heat transfer in the adsorption bed. The thermal wave cycle doesn’t seem to be practicable in adsorption refrigeration because the ideal thermal wave can only be established with very low fluid velocity, which will greatly cut down the power density of the system.展开更多
The Difference between an ideal cycle and its real cycle and the length of cycle time aretwo main factors affecting the real operation of heat regellerative adsorption refrigerationsystem. In this paper, these factors...The Difference between an ideal cycle and its real cycle and the length of cycle time aretwo main factors affecting the real operation of heat regellerative adsorption refrigerationsystem. In this paper, these factors are chiefly analyzed. Some conclusions are given asfollows: A real cycle system can be controlled according to some regulations to reduce thedifference between the real cycle and its corresponding ideal cycle, There is an optimum cycletime which makes the refrigeration power density the greatest.展开更多
本文采用巨正则蒙特卡洛(grand canonical Monte Carlo,GCMC)方法,基于UFF(universal force field)和TraPPE(transferable potentials for phase equilibria)力场,对ZIF-8(Zn)吸附NH_(3)进行了分子模拟研究,并结合分子模拟结果和吸附式...本文采用巨正则蒙特卡洛(grand canonical Monte Carlo,GCMC)方法,基于UFF(universal force field)和TraPPE(transferable potentials for phase equilibria)力场,对ZIF-8(Zn)吸附NH_(3)进行了分子模拟研究,并结合分子模拟结果和吸附式制冷热力学循环模型,研究了ZIF-8(Zn)/NH_(3)工质对的吸附性能和制冷性能。研究表明:在等温条件下,ZIF-8(Zn)对NH_(3)的吸附量随压力的增大而提高,298 K和398 K下饱和吸附量分别达到0.305 g/g和0.231 g/g;同一温度下的总吸附热也随压力的增大而上升,这主要归因于NH_(3)分子间相互作用产生吸附热的增加,而ZIF-8(Zn)与NH_(3)相互作用的吸附热维持在较稳定的状态;NH_(3)在ZIF-8(Zn)中的吸附密度分布结果表明NH_(3)在金属位点处被大量吸附,难以通过ZIF-8(Zn)部分孔径较小的孔道,成功通过孔道的NH_(3)在ZIF-8(Zn)的SOD笼内部聚集;该吸附式制冷工质对制冷性能稳定,对温度有较好的适应性。制冷温度为283 K(通风工况)的制冷系数为0.43,制冷温度为243 K(冷冻工况)的制冷系数仍能达到0.38。展开更多
基金This work was supported by the National Natural Science Foundation for Distinguished Young Scholars of China(Grant No.50225621)the National Key Fundamental Research Program(Grant No.G2000026309)+1 种基金the Teaching and Research Award Program for Out-standing Young Teachers in High Education Institutions of MOE,Chinathe Shuguang Training Program of Shanghai Education Commission(Grant No.02GG03).
文摘As a type of environmental benign refrigera- tion technology powered by low grade thermal energy, ad- sorption refrigeration have aroused more and more at- tention in recent years. In this paper, the research frontiers of adsorption refrigeration, including adsorbent, adsorption theory, heat recovery process, technology of adsorber, the research achievements, and the development achievements, are summarized. Typical systems foradsorption refrigeration research facing to applications in the recent years are pre- sented. Future applications of adsorption refrigeration are analysed.
文摘A model is established to investigate the thermal wave in adsorption refrigeration by ana1yzing the transient heat transfer in the adsorption bed. Numerical method is adopted. The fluid velocity and the equivalent heat transfer coefficient, which mainly infiuence the characteristic of the thermal wave, are discussed. Their influence to the COP and SPD(system power density) is also presented. The key to the thermal wave cycle is to greatly intensify the heat transfer in the adsorption bed. The thermal wave cycle doesn’t seem to be practicable in adsorption refrigeration because the ideal thermal wave can only be established with very low fluid velocity, which will greatly cut down the power density of the system.
文摘The Difference between an ideal cycle and its real cycle and the length of cycle time aretwo main factors affecting the real operation of heat regellerative adsorption refrigerationsystem. In this paper, these factors are chiefly analyzed. Some conclusions are given asfollows: A real cycle system can be controlled according to some regulations to reduce thedifference between the real cycle and its corresponding ideal cycle, There is an optimum cycletime which makes the refrigeration power density the greatest.
