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选取SAPO-34分子筛作为吸附剂,与水组成吸附制冷工质对。采用真空重量法测定SAPO-34对水的吸附等温线;用热分析天平测定水在SAPO-34上的脱附温度;在吸附制冷循环模拟实验装置上测试不同再生温度对SAPO-34-水工质对吸附制冷性能的影响。结果表明,SAPO-34对水的吸附等温线属于Ⅴ型等温线,吸附温度30℃时,SAPO-34对水的平衡吸附量达0.35 kg?kg?1;水在SAPO-34上的DTA脱附峰顶温度为105℃,完全脱附温度为155℃;蒸发温度10℃工况下,再生温度80~120℃,SAPO-34-水工质对的吸附制冷量为354~430 kJ?kg?1,是硅胶-水的1.1~1.2倍;再生温度150~300℃,SAPO-34-水工质对的吸附制冷量为465~523 kJ?kg?1,是13X-水的1.1~1.7倍。SAPO-34-水工质对既可用于发动机尾气等较高温热源驱动的吸附制冷系统,也可用在以太阳能等低温热源驱动的吸附制冷过程。 相似文献
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采用凹凸棒粘土和氯化钙为主要原料,用溶解-混合法制备了复合吸附剂;采用正压重量法测量了复合吸附剂对氨的吸附等温线;并测定了吸附剂-氨工质对的制冷特性。结果表明:吸附温度30℃下,复合吸附剂对氨的平衡吸附量为1.1kg/kg,与氯化钙对氨的平衡吸附量相当。在装填密度为600kg/m3,吸附温度为30℃、蒸发压力为0.25MPa、解吸温度为300℃条件下,对氨的吸附量达到0.89~0.92kg/kg,循环吸附量为0.55~0.58kg/kg,是纯氯化钙的1.7倍;复合吸附剂-氨工质对制冷量可达761.84kJ/kg,比氯化钙-氨工质对提高了70%。而且,复合吸附剂具有良好的吸附解吸稳定性能。 相似文献
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A new metal-organic framework of MIL-101 was synthesized by hydrothermal method and the powder prepared was pressed into a desired shape. The effects of molding on specific surface area and pore structure were investigated using a nitrogen adsorption method. The water adsorption isotherms were obtained by high vacuum gravimetric method, the desorption temperature of water on shaped MIL-101 was measured by thermo gravimetric analyzer, and the adsorption refrigeration performance of shaped MIL-101-water working pair was studied on the simulation device of adsorption refrigeration cycle system. The results indicate that an apparent hysteresis loop ap-pears in the nitrogen adsorption/desorption isotherms when the forming pressure is 10 MPa. The equilibrium ad-sorption capacity of water is up to 0.95 kg·kg^-1 at the forming pressure of 3 MPa (MIL-101-3). The desorption peak temperature of water on MIL-101-3 is 82℃, which is 7 ℃ lower than that of silica gel, and the desorption temperature is no more than 100 ℃. At the evaporation temperature of 10 ℃, the refrigeration capacity of MIL-101-3-water is 1059 kJ·kg^-1, which is 2.24 times higher than that of silica gel-water working pair. Thus MIL-101-water working pair presents an excellent adsorption refrigeration performance. 相似文献
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目的:研究乐陵枣叶总黄酮的抗氧化活性。方法:采用分光光度法测定枣叶总黄酮对DPPH·、·OH和O-2·的清除能力和总黄酮的还原力;同时利用皮肤荧光斑马鱼进行总黄酮的抗氧化活性实验。结果:枣叶总黄酮在0.2~1.0mg/mL范围内对DPPH·,·OH和O-2·有着良好的清除作用,当试样浓度为1.0mg/mL时,清除率达到最大,分别为65.4%,55.0%,75.5%。在对皮肤荧光斑马鱼进行总黄酮的抗氧化活性体内实验中,设置了三个实验组(20,50,100μg/mL),其相对抗氧化能力分别达到了49.6%,58.6%和77.8%。结论:乐陵枣叶总黄酮对自由基具有良好的清除作用,具有较好的抗氧化能力。 相似文献
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一类抛物型脉冲调宽采样控制系统的稳态控制 总被引:1,自引:0,他引:1
文[1]中讨论了一类线性抛物型脉冲调宽采样控制系统的稳态控制, 本文在较弱的条件下得到类似的结果, 并证明了一类半线性抛物型脉冲调宽采样控制系统的稳态的存在性. 相似文献