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以一建筑物为对象进行空调能耗计算,对柴油发动机驱动活塞式制冷压缩机与电驱动活塞式制冷压缩机的能耗、季节性能系数COP等指标进行了分析与比较。 相似文献
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探讨了天然气总能系统(IES)制冷方式和利用尾气余热为吸收制冷提供热量的方法。对电机驱动压缩制冷,天然气直燃吸收制冷,燃气发动机驱动压缩制冷,燃气轮机发电和吸收制冷系统的一次能源利用率和装置成本进行了比较分析。 相似文献
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《Planning》2015,(2)
为准确描述开式简单布雷顿制冷循环的热力学性能,根据工质流动机理的一致性,采用与开式布雷顿正循环研究类似的研究方法,建立了考虑压降不可逆性的开式简单布雷顿制冷循环的热力学模型,导出了制冷率和制冷系数等性能参数与压缩机进口相对压降的函数关系,并分析了循环的热力学性能。结果表明,压缩机消耗功率、高温侧换热器换热率、膨胀机输出功率、制冷率和排气损失引起的热流率都与质量流率成正比,存在最佳的压缩机进口相对压降使循环制冷率最大。 相似文献
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1995年芝加哥国际空调供暖制冷展览会考察报告 总被引:1,自引:0,他引:1
1995年芝加哥国际空调供暖制冷展览会考察报告南京建筑工程学院李志浩’95国际展览会概况前已报道,现将展览会展出的新产品新技术作一简要介绍。1制冷压缩机11活塞式压缩机活塞式压缩机因有许多缺点,如体积大、振动噪声大、零部件多(为螺杆式压缩机的10倍)... 相似文献
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将当前的天然气液化技术与热声制冷技术进行比较。热声制冷技术使制冷系统变得简单,实现了制冷系统中无运动部件,在利用废热、太阳能等低品位能源上有较大优势。介绍了热声制冷机、热声发动机和热声驱动的脉管制冷机,阐述了热声制冷技术发展现状及其在天然气液化方面的应用。 相似文献
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区域供冷或区域供热供冷系统可以归纳为两种主要的类型 :一是在中央制冷站制取冷水 ,而后将冷水沿一条双管系统输送到用户。此种系统类似于区域供热系统。中央制冷站由许多不同的设备组成 ,如电驱动活塞式和螺杆式压缩机或蒸汽轮机等。有时也用吸收式制冷机。可能使用不同的燃料和制冷剂 ,在某些情况下 ,甚至从海洋和邻近的湖泊中获取冷量。二是在用户或靠近用户的房屋内使用区域供热热能来驱动制冷机制取冷水。这种制冷机可以是吸收式 ,也可以是喷射式的。能源与区域供热系统所用相同。尤其是在夏季冷负荷高峰期 ,适合利用此时来源丰富的工… 相似文献
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建立了基于能量守恒的螺杆式制冷压缩机模型,通过该模型和冷凝器模型联合求解得出了不同冷却水入口温度下的制冷机组能耗。提出了压缩机部分负荷效率以更好地模拟制冷机组部分负荷工况下的能耗。将该模型应用于某制冷机组,计算结果表明该模型具有较高的精度。 相似文献
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提供一种利用压缩机停机储能再启动方法,以及利用压缩机停机储能再启动的能量存储释放装置,实现对压缩机电机的保护,同时节能环保。该方法是将压缩机在停机时的动能转化为弹性势能,再在压缩机开机过程中,将弹性势能释放出来,转变为压缩机的动能。该装置是压缩机电机转子一端连接压缩机气缸,用于带动压缩机做压缩气体运动,电机转子的另一端处连接涡卷弹簧储能装置,将压缩机在停机时的动能转化为弹性势能储存在涡卷弹簧内,再在压缩机开机过程中,涡卷弹簧储能装置将涡卷弹簧内的弹性势能释放出来,转变为压缩机的动能。 相似文献
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综合分析了评价螺杆式冷水机组性能和运行效率的四个原则,包括压缩机的可靠性原则,机组的节能装置效果以及在部分负荷下的能效,制冷剂,噪声以及经济性四个基本综合评价原则,最后结合实际工程对螺杆压缩式制冷机组的两种设计方案进行比较,可为螺杆压缩式制冷机组在空调工程中的应用提供技术选型依据. 相似文献
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从外部构造、安装条件、排气温度、噪声、含油量、耗能、操作要求等方面对LS20-150螺杆式压缩机和4L-20/8活塞式压缩机进行了性能比较分析,以指导各单位合理选择压缩机。 相似文献
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当室外气温较高时,风冷热泵系统冷凝器存在换热效果下降的问题,而蒸发式冷凝器可以改善此问题,蒸发式冷凝器因此逐步得到广泛重视。为研究采用蒸发式冷凝器制冷系统的能耗情况,通过正交实验的方法,对比研究了蒸发式冷凝器与风冷式冷凝器在相同工况下压缩机能耗情况,并对影响其性能的因素进行了分析。研究表明,各因素对压缩机耗功量的影响能力依次为:冷凝器进口空气温度、速度及冷凝器喷水量。压缩机耗功量随进口空气温度的升高、进风空气速度降低而增大,随喷水量增加存在先减小后保持不变的现象。 相似文献
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The structural air compressor has heavy power consumption during the course of operation, so the energy conservation control is one of the major challenges in the research of its control mechanism. In this paper, a co-operative control mechanism based on the gray prediction is proposed to control the air supply flow of the air compressor. The air supply flow of each air compressor is sent to the main gas tank, and dozens of pneumatic rock drills are driven by the high pressure gas of a main pipeline connected to the main gas tank. According to the real-time measurement and analysis of the pressure of the main gas tank, the controller predicts the next value of the pressure and dynamically regulates the working time of each air compressor. With the control mechanism, the pressure of the main gas tank is smooth and the total working time of the air compressors is reduced. The statistical results demonstrate that the presented control mechanism can effectively reduce about 22% energy consumption of the air compressor. 相似文献
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The opposed piston linear compressor is considered to be the future of silent, reliable and efficient compression technologies. For long valves, less linear compressors have been widely used in cryocoolers for space applications. Recently research has established its high-performance characteristics which are useful in household refrigeration application. Unlike reciprocating compressors which are driven by rotary motors and need a crank connecting rod mechanism to convert rotary into linear motion, a linear compressor is driven by a linear motor which reduces the number of moving parts. This feature makes the compressor more reliable, more efficient and has a silent operation. The piston (suspended on spring stiffness) in the linear compressor is a free piston, i.e. motion of the piston is not constrained hence the performance of the linear compressor is highly dependent on system resonance. Free piston motion offers the unique advantage of ease of modulation, i.e. the stroke of the compressor and hence the delivery mass flow rate coming out of the compressor can be easily controlled by changing the supply voltage. Resonance in the linear compressor is a function of moving mass, spring stiffness and operating or electrical frequency. Achieving resonance in the linear compressor results in maximising the cooling performance of the refrigerator and minimising the input power requirement and hence an increase in the COP of the refrigeration system. The present paper discusses the results from resonance testing of the opposed piston linear compressor for household refrigerator using the fast Fourier transformation analysis. There are different parameters that are considered to optimise the natural frequency of the opposed piston linear compressor, consisting of frequency, moving mass, and spring stiffness. The piston performs compression and suction in a similar manner as in the conventional reciprocating compressor. An opposed piston linear compressor exhibits high energy efficiency due to its simple construction and less moving parts, its mechanical losses are much less than the reciprocating compressor. 相似文献