共查询到20条相似文献,搜索用时 171 毫秒
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利用热力学原理和堋分析方法,建立空调系统热回收器系统的分析模型,对目前应用的暖通空调系统中热回收技术进行垌分析,得出对于热回收节能技术进行全面、合理的科学分析与评价方法。总结空调系统应用热回收器的一些注意事项。 相似文献
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首先简要介绍了空调冷凝热回收的意义,其次简要介绍了冷凝热回收的分类及冷凝热回收技术的研究现状及进展,然后重点介绍了复合太阳能的空调冷凝热回收热水供应系统和复合太阳能-热泵热回收技术的研究进展及应用。最后,对复合太阳能的冷凝热回收技术进行了展望。 相似文献
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用于集中供热的冷凝热回收(火用)分析 总被引:1,自引:0,他引:1
用(火用)平衡分析法对西山热电的原集中供热系统和冷凝热回收后的集中供热系统进行了(火用)流分析.两者对比表明,冷凝热回收用于集中供热是实现节能减排的一条有效途径. 相似文献
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为解决目前传统新风系统常用的纸芯能量回收器存在新风、回风交叉污染及能量综合回收率低的问题,将椭圆扭曲管应用于空调新风系统,基于铝合金传热元件研发了一种新型高效的能量回收器。设计椭圆扭曲管和圆管两种不同结构的能量回收器,应用Fluent软件进行数值模拟,对比分析其换热和流动性能,并对其应用于空调新风系统的节能效果进行分析。结果表明,相对于圆管能量回收器,空气在通过椭圆扭曲管能量回收器时壳程温度下降得更快,管程温度提升也更快,换热系数更高,换热效果更好,尤其是处于夏季工况时换热效果较为明显。增设了能量回收器的新风机可以有效提升室内环境的舒适性,在夏热冬冷和寒冷地区节能效果显著。 相似文献
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某些工艺性空调系统全年使用,按生产工艺要求为空调区域提供稳定的、合适的空气温度和湿度,因而需要在空气处理过程中,对空气进行预热和再热。如果空气的预热和再热是利用回收冷凝热获得的热水,从而减少了电加热或者蒸汽加热的使用,将可以大大地节约能源。文章阐述了应用水源热泵回收冷水机组冷却水冷凝热量的技术及该技术适用范围,并对实际应用于工艺性空调系统的案例作了比较全面的介绍。 相似文献
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通过深入分析空调负荷与热水负荷的耦合关系,提出了一种充分利用制冷机组回收的废热提供生活热水的设计方法,并把这种突破性做法与传统的空调和热水供应系统进行比较,探讨利用酒店的空调冷凝热回收技术制备生活热水,以寻求一个技术可行、低能耗和无污染的空调和热水供应系统方案. 相似文献
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热回收蓄能空调系统的应用研究 总被引:7,自引:0,他引:7
本文重点阐述了热回收技术和蓄能技术在空调系统中的应用,在工作原理、节能循环分析、经济性分析、控制和应用注意事项等多方面进行了初步研究,研究结果表明该节能技术在制冷空调系统中的运用大有前途,可以得到大力的推广。 相似文献
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空气源热泵空调系统节能分析 总被引:8,自引:1,他引:8
节能的分析及优化已不仅仅是能的量的问题,而是能的质与量的综合评价的问题。采用yong分析方法得出空气源热泵空调系统的能耗分布,明确系统yong损失较大的环节。从yong分析得知:压缩机的yong损失占机组能耗的20.5%,冷凝器的yong损失接近总能耗的30%。由此提出了空气源热泵空调系统的节能措施,即应该选用高效率的压缩机,采用强化传热措施,提高传热系数,减小传热温差,同时还应注意改善热泵机组的周围环境,使系统yong损失最小,yong效率最大,实现空气源热泵空调系统的节能优化. 相似文献
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Air-conditioning system consumes a large amount of electricity in residential sections,and its efficiency has drawn extensive concerns in energy-conscious era.Liquid-vapor separation is a heat transfer enhancement technology that can effectively improve the performance of the heat exchanger as well as the system.In this paper,a regular air-conditioning system as the baseline(system-A)and other two air-conditioning systems with liquid-vapor separation heat exchanger(system-B and system-C)are comparatively studied.The component behaviors and system performances are deeply explored by using advanced exergy analysis with a focus on quantifying how much consequences come from the variants,i.e.liquid-vapor separation.The results indicate that the system-B has large reduced exergy destruction from the compressor and condenser at cooling mode relative to the system-A.The system-C has mainly diminished exergy destruction in the compressor caused by other components relative to the system-B.At heating mode,the system-C has an enhanced system exergy efficiency of 9.6%over the system-A,and it also has the decreased avoidable exergy destruction which is dominantly contributed by the compressor and evaporator.Furthermore,it is found that liquid-vapor separation mainly benefits the compressor and outdoor heat exchanger where it locates,leading to the system performance improvements. 相似文献
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运用热力学火用分析的方法,分别考虑了高低温侧换热器、热回收装置侧换热器和中冷器的热阻损失,以及压缩机和涡轮机中的内不可逆损失,以无因次总输出火用和火用效率为目标函数,借助数值分析的方法,研究了恒温热源条件下不可逆中冷焦耳—布雷顿功热并供系统的火用性能,分析了主要特征参数对无因次总输出火用及火用效率的影响。分析结果表明,当中间压比不变而总压比变化时,存在一组最佳运行参数,使无因次总输出火用达到最大,还存在最大的总输出火用和火用效率以及相对应的一组最佳运行参数。提高中冷器换热有效度可以增加无因次总输出火用和火用效率。 相似文献
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《Applied Thermal Engineering》2007,27(5-6):942-950
Analysis method of product exergy cost has been presented for scheme-selection optimization of cooling and heating source system of air-conditioning system for buildings in this paper. And the product exergy cost is considered as the objective function by which to evaluate the air-conditioning cooling and heating sources system. Taking other related factors into consideration, the optimization algorithm for the air-conditioning cooling and heating source scheme-selection is brought forward. This optimization algorithm adopts an integrative, multiple objective decision method with the analysis of the product exergy cost. The algorithm essentially allows the air-conditioning cooling and heating source scheme-selection to be quantifiable. An example is presented to prove that the method is scientific and reliable. 相似文献
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The experimental system for the transcritical CO2 residential air-conditioning with an internal heat exchanger was built. The effects of working conditions on system performance were experimentally studied. Based on the experimental dada, the second law analysis on the transcritical CO2 system was performed. The effects of working conditions on the total exergetic efficiency of the system were investigated. The results show that in the studied parameter ranges, the exergetic efficiency of the system increases with the increases of gas cooler side air inlet temperature, gas cooler side air inlet velocity and evaporating temperature. And it will decrease with the increases of evaporator side air inlet temperature and velocity. Then, a complete exergetic analysis was performed for the entire CO2 transcritical cycle including compressor, gas cooler, expansion valve, evaporator and internal heat exchanger under different working conditions. The average exergy loss in gas cooler is the highest one under all working conditions which is about 30.7% of the total exergy loss in the system. The second is the average exergy loss in expansion valve which is about 24.9% of the total exergy loss, followed by the exergy losses in evaporator and compressor, which account for 21.9% and 19.5%, respectively. The exergy loss in internal heat exchanger is the lowest one which is only about 3.0%. So in the optimization design of the transcritical CO2 residential air-conditioning system more attentions should be paid to the gas cooler and expansion valve. 相似文献
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利用海水淡化技术将淡水从海水中分离出来是解决淡水资源短缺问题的有效途径。气隙扩散蒸馏装置是一种热分离装置,该装置具有表面积大、工作温度低、热源适应性好、金属消耗量低、常压运行等优点,非常适合偏远山区和海岛地区的应用。对气隙扩散蒸馏模型进行了建模,利用NaCl水溶液模型进行了■分析。以热料液温度、冷料液温度、溶液流量对■效率的影响进行了敏感性分析。计算并比较了外热源、蒸发器、气隙和冷凝器的■损失。研究发现气隙扩散蒸馏装置■效率可以达到30%,为工艺优化和提高装置的能效提供了指导。 相似文献
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以低品位热能驱动的有机朗肯循环发电系统,是实现将低品位热能转变为电能,进而提高热力系统总体热效率,降低污染排放的有效途径之一。本文建立了低品位热能发电系统火用分析模型,对以R245fa为工质的温度低于383.15 K的低品位热能有机朗肯循环余热发电系统进行了火用分析,得到了各环节的能量转换效率并确定了对系统性能影响最大的环节;通过改变蒸发器和冷凝器的压降和传热系数值,分析了主要换热设备的设计和运行性能参数对系统火用效率、热效率和发电量的影响趋势,提出了低品位热能发电系统的优化方向。 相似文献