共查询到18条相似文献,搜索用时 171 毫秒
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太阳能溴化锂吸收式制冷技术的研究进展 总被引:1,自引:0,他引:1
介绍了太阳能澳化锂吸收式制冷循环的工作原理和系统构成,具体阐述了该制冷循环的几种典型结构,包括单效、双效、两级以及三效涣化锂吸收式制冷循环,分析了各种制冷循环的优缺点以及目前研究进展;进一步讨论了太阳能澳化锂吸收式制冷机组的性能特点受冷媒水出口温度、冷却水进口温度、加热蒸汽温度、污垢系数及不凝性气体等诸多因素的影响;提出了太阳能溴化锂吸收式制冷技术现存问题,最后指出,随着科学技术的发展和绿色建筑的兴起,太阳能溴化锂吸收式制冷将会有非常大的发展前景。 相似文献
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一种新型混合吸收式制冷循环的性能分析 总被引:1,自引:0,他引:1
该文提出一种新型吸收式循环,可以较好利用太阳能实现制冷,解决传统吸收式系统在利用太阳能实现制冷时存在的弊端。这种新型混合式吸收式制冷循环在两级吸收式循环的基础上增设了一个附加高压发生器,发现影响系统COP值的因素主要是LiBr溶液浓度与低压发生器中的压力。在溶液浓度与压力的允许范围内时,新型循环的高压发生器再生出LiBr溶液与低压吸收器的吸收后的溶液混合,提高高压吸收器吸收剂浓度从而减小其压力。本文主要分析了混合吸收式制冷循环的各种性能特性,得出影响系统热力系数(COP)可达0.55,驱动热源的可利用温差最高可达35℃。 相似文献
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太阳能吸收—喷射复合制冷系统研究 总被引:6,自引:1,他引:5
报道了一种可以利用太阳能等低焓能的吸收-喷射复合制冷循环系统,并进行了热力学分析。与吸收式制冷循环相比,该系统能较大地提高热力系数。还初步分析了可以用于该循环系统的工质对,最后给出计算实例。 相似文献
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由于可以利用低品位热源制冷,氨水吸收式制冷系统得到了广泛的应用。氨水系统的精馏器要求很高的安装精度,限制了其应用范围。为了开发新型制冷器,将升膜理论应用到氨水吸收式制冷系统中,用一个冷凝发生器来实现精馏塔的作用。研究结果表明,本循环的热力系数比较高,这一成果可广泛应用于各种车、船等的制冷系统设计中。 相似文献
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以空气为携热介质的开式太阳能吸收式制冷循环研究与分析 总被引:3,自引:1,他引:2
以空气为携热介质的开式太阳能吸收式制冷循环为研究对象,根据工作循环的特点给出了循环工作流程及计算方法,并对循环进行了详细的计算和分析。得出循环COP值、制冷量与湿空气出口处工作溶液与空气的水蒸气分压力差随热空气温度、环境空气温度和相对湿度之间的关系。通过研究发现,当热空气达到一定温度时,循环具有较好的稳定性。与闭式太阳能吸收式制冷循环相比,开式循环具有启动快、COP值高、系统简单、造价低等优点,特别适合在高温炎热地区使用。 相似文献
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研究了一种太阳能喷射/压缩复合制冷循环,由太阳能集热子系统、喷射制冷子系统及压缩制冷子系统组成,系统充分利用热电两种能源以及两种制冷方法各自的优点,优化喷射制冷子系统工作性能的同时,改善压缩式子系统的工作条件,从而提高复合制冷循环性能的同时节约高品位电能。采用性能较好的高蒸发温度式喷射制冷带走压缩机排气余热具有实际意义。通过数值模拟的手段分析系统性能及其主要影响因素,并优化工作条件。研究表明,与相同工作条件下的单压缩制冷循环相比,复合制冷循环工作日全天候运行时电力性能系数提升约为31.5%,节电优势显著。存在一个最佳的喷射子系统蒸发温度使得复合制冷循环性能系数达到运行工况的最大值。 相似文献
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A solar refrigerator is made of a solar collector and a refrigeration system. Real solar refrigerators usually operate between two limits, maximum coefficient of performance (COP) and maximum cooling load. A new model is presented to describe an irreversible absorption refrigerator, in which not only the irreversibilities of heat conduction but also those resulting from friction, eddy and other irreversible effects inside the working fluid are considered. The influence of these irreversible effects on the performance of an absorption refrigerator with continuous flow is investigated. The analytical expressions of the optimal refrigeration coefficient and the cooling rate of the refrigerator are derived. The predictions of the model are compared with semi-empirical cycle model of single-stage absorption refrigeration machines. The results obtained here can describe the optimal performance of a four temperature level absorption refrigeration affected simultaneously by the internal and external irreversibilities and provide the theoretical bases for the optimal design and operation of real absorption refrigerators operating between four temperature levels. 相似文献
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A systematic investigation is made of the two-stage vapour absorption refrigeration system employing the refrigerant absorbent combinations of NH3---H2O and NH3---LiNO3. The system consists of coupling two conventional absorption cycles so that the first-stage evaporator produces cooling water to circulate in the absorber of the second stage. The effect of operating variables such as generator temperature, evaporator temperature, absorber temperature and condenser temperature on the coefficient of performance (COP), heat transfer rates and relative circulation have been studied for both single-stage and two-stage absorption refrigeration systems. It is found that the COP is higher for NH3---LiNO3 than for NH3---H2O, in both single-stage and two-stage absorption systems, especially at higher generator temperatures. Furthermore, the minimum evaporator temperature achieved is lower for NH3---LiNO3, and the system can be operated at lower generator temperatures. 相似文献
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A novel lithium bromide/water mixed absorption refrigeration cycle that is suitable for the utilization of solar air-conditioning and can overcome the drawbacks of low system overall efficiency of traditional solar absorption refrigeration air-condition systems is presented. The accessorial high pressure generator was added in the cycle. The lithium bromide solution flowing out from the high pressure generator was mixed with the solution from the low pressure absorber to increase lithium bromide solution concentration and decrease pressure in the high pressure absorber. The performance of a mixed absorption refrigeration cycle was analyzed. The theoretical analysis shows that the highest COP is 0.61, while the highest available temperature difference of heat resource is 33.2°C. The whole coefficient of performance of the solar air-conditioning using mixed absorption cycle is 94.5% higher than that of two-stage absorption. The advantages of solar air-conditioning can be markedly made use of by the cycle. 相似文献
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Zhongmin Wan Shuiming Shu Xinhua Hu Biaohua Wang 《Frontiers of Energy and Power Engineering in China》2008,2(2):222-226
A novel lithium bromide/water mixed absorption refrigeration cycle that is suitable for the utilization of solar air-conditioning
and can overcome the draw-backs of low system overall efficiency of traditional solar absorption refrigeration air-condition
systems is presented. The accessorial high pressure generator was added in the cycle. The lithium bromide solution flowing
out from the high pressure generator was mixed with the solution from the low pressure absorber to increase lithium bromide
solution concentration and decrease pressure in the high pressure absorber. The performance of a mixed absorption refrigeration
cycle was analyzed. The theoretical analysis shows that the highest COP is 0.61, while the highest available temperature difference
of heat resource is 33.2°C. The whole coefficient of performance of the solar air-conditioning using mixed absorption cycle
is 94.5% higher than that of two-stage absorption. The advantages of solar air-conditioning can be markedly made use of by
the cycle.
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Translated from Journal of Huazhong University of Science and Technology, 2006, 34(8): 62–64 [译自: 华中科技大学学报] 相似文献