共查询到19条相似文献,搜索用时 62 毫秒
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转轮除湿空调系统是将转轮除湿机与常用冷却方式相结合实现空调制冷的新型空调系统。为降低转轮除湿空调系统的再生能耗以及提高系统的冷却能力,本文提出双级热管转轮除湿空调系统,系统利用重力热管的冷凝段实现转轮除湿机的再生,蒸发段实现处理空气的冷却。建立了双级热管除湿转轮空调系统传热传湿模型,模拟分析了系统在不同工况下系统的降温除湿特性。研究表明,处理空气进口温度越高,系统的冷却能力越强但系统的除湿能力降低;处理空气湿度越高,系统的除湿能力越强,但系统的冷却能力降低;再生温度越高,系统除湿能力越强,系统热力性能系数越低,但冷却能力降低。综合降温除湿能力及节能要求,双级热管转轮除湿空调系统的再生温度不宜过高,推荐≤80℃。 相似文献
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针对常规转轮除湿空调系统再生能耗高、再生排风热损失大的问题,提出了热泵再生型转轮除湿空调系统,该系统能同时回收转轮除湿侧的吸附热及再生侧的排风热。研究热泵再生型转轮除湿空调系统的热力过程,进而建立该系统的■能耗模型。分析室外气象参数对系统性能的影响,随着室外空气温度的升高,系统的■损耗减少,■效率提高;随着室外空气含湿量的提高,系统的■损耗先减少后增加;当室外干球温度低于34.0℃,含湿量低于20.3 g/kg(相对湿度为59.8%)时,系统的送风参数能满足室内舒适性要求。结果表明热泵再生型转轮除湿空调系统较适用高温中湿的室外环境。 相似文献
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针对常用的转轮除湿空调系统能耗高的问题,通过理论分析,提出了转轮除湿机与预冷器或热回收装置不同组合下的三种节能型转轮除湿空调系统,并建立相应的能耗数学模型。实例能耗分析表明:有预冷的转轮除湿空调系统比无预冷的转轮除湿空调系统总能耗低40.9%~43.8%;有热回收转轮的除湿空调系统比无热回收转轮的除湿空调系统总能耗低16.1%~20.2%;预冷热回收型转轮除湿空调系统能耗最低,比传统冷却除湿空调系统节能12.8%。处理空气先预冷后除湿和增加热回收装置的措施可大大降低转轮除湿空调系统能耗。 相似文献
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针对锂电池厂房传统除湿空调系统能耗大和再生热湿排风能源浪费,提出了热湿回收二次回风除湿空调系统。以某典型低露点卷绕车间为例,对热湿回收二次回风除湿空调系统和传统除湿空调系统的热力学性能进行对比研究。结果表明:与传统除湿空调系统相比,热湿回收二次回风除湿空调系统的再生电加热量降低了26.4%,系统热力性能系数TCOP增加了120.1%,■效率提高了4.3%,并回收冷凝水量16.6 g/s,系统具有良好的节能效果。 相似文献
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可见/近红外光谱检测冷鲜猪肉中的脂肪、蛋白质和水分含量 总被引:12,自引:0,他引:12
采用可见/近红外光谱分析方法对冷鲜猪肉中的脂肪、蛋白质和水分含量进行了研究。光谱数据经多元散射校正(MSC)处理后,分别建立0~4 ℃和20 ℃下的原始光谱、一阶导数和二阶导数的偏最小二乘(PLS)定量分析模型,比较其相关系数(r)、校正标准差(RMSEC)和预测标准差(RMSEP),得到一阶导数处理后的模型最好,并且0~4 ℃下的模型优于20 ℃下的模型。0~4 ℃和20 ℃下脂肪的相关系数(r)分别为0.950和0.924,蛋白质为0.713和0.455,水分为0.944和0.914;脂肪的预测标准差(RMSEP)分别为2.41和2.95,蛋白质为5.44和4.25,水分为2.37和2.38。由此可见,可见/近红外光谱分析方法能够很好的检测冷鲜猪肉中的脂肪和水分,蛋白质的检测结果较差是由冷鲜肉加工工艺引起的。另外,两种温度下光谱曲线在770 nm附近产生了波长漂移,漂移量约10 nm。 相似文献
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针对大功率LED存在的散热问题,提出了一种双进双出射流水冷散热器,将其与现有射流水冷散热器的散热效果进行对比,并设计了基于射流水冷的大功率LED散热系统实验平台.在散热系统全功率工作条件下,LED底部温度分布均匀,并且保持在32℃左右,表明散热系统具有良好的均温性能和散热性能,满足大功率LED的散热要求.利用极差分析法,得到了水泵和风扇对系统散热效果的影响权重,优化了散热系统的工作功率,得到一组较优的控制水泵和风扇功率的脉冲宽度调制信号.在该组控制信号下,降低了散热系统的功耗,同时保证了系统散热效果,达到了节能目的. 相似文献
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A.A. Novakova S.A. Pargamotnikas V. Taseva I. Dobbrevsky V. Nenov B. Bonev 《Hyperfine Interactions》1998,112(1-4):29-34
Mossbauer spectroscopy have been applied to the analysis of corrosion sediments formed on mild steel coupons, which were placed
in the different points of the Bourgas Petrochemical Plant Recilculating Cooling Water System. It was shown that the created
corrosion products can successfully reflect the ambient water medium pollution to which the coupons were exposed.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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This paper formulates the Chen chaotic system to the extended Kolmogorov system, thereby investigating the physical meaning and energy cycle of Chen system. The Casimir function is introduced to analyze the system dynamics, and its time derivation is chosen to formulate energy cycle. The bound of chaotic attractor is obtained by the Casimir function and Lagrange multiplier. The Casimir function reflects the energy conversion and the distance between the orbit and the equilibria. These relationships are illustrated by numerical simulations. 相似文献
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本文通过对XRF水冷却外循环系统的技术改造,解决了因停水而被迫停机的问题。大大地提高了XRF的工作效率,对保护设备起到了较大的作用,结果令人满意。同时,阐述了该系统的工作原理 相似文献
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In this paper, an energy and exergy analysis is applied to the air dehumidification unit of a liquid desiccant system in an industrial gelatin conveyor dryer. The working fluid is a binary solution of lithium chloride (LiCl) in water. Dry air is used in order to decrease the amount of liquid in the gelatin. Therefore, the environmental air must have its absolute humidity reduced from about 12 g/kg to the project target, which is 5 g/kg. The process is a cycle using an absorption desiccant unit (LiCl in water), where the weak solution absorbs water vapor from the air. In the regenerator, condensation of the solution (desorption) from the moist air occurs. As a result, the steam consumption of the desorber and electrical power used for the vapor compression chiller (with ammonia, NH, as working fluid) are the primary sources of cost for the factory. To improve the plant’s energy and exergy behaviors, the process is evaluated using a mathematical model of the system processes. In addition, we evaluate the substitution of the vapor compression chiller by an absorption unit (lithium bromide (LiBr) in water). The performance indicators of the compression vapor systems showed the best results. Even when using the condenser’s energy to pre-heat the solution, the installed system proved to be more effective. 相似文献