共查询到17条相似文献,搜索用时 78 毫秒
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提出了一种低频热驱动气–液耦合热声制冷系统,通过数值模拟优化了该系统的结构参数并对其热力性能进行了数值模拟分析。首先,分别对系统关键参数的沿程分布和各部件的?损失进行了分析;然后,探究了不同压力下液体质量对系统热力学参数的影响;最后,与传统热声制冷系统进行了对比。结果表明,气液耦合热声制冷系统可以有效地提升系统的压比、制冷量、COP和相对卡诺效率,降低系统的起振温度和频率。在加热温度300℃,制冷温度15℃,环境温度50℃,平均压力10 MPa时,气液耦合热声制冷系统制冷量为31.12 k W,是传统热声系统理论值的4倍,COP和相对卡诺效率相对于传统热声制冷系统的理论值分别提升了13%和25.9%。 相似文献
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本文将三种空分压缩热的利用方式加以比较,包括有机朗肯–空分压缩热回收系统(ORC-ACS),有机朗肯–电驱动式蒸气压缩–空分压缩热回收系统(ORC-VCR-ACS),以及有机朗肯驱动式–蒸气压缩–空分压缩热系统(ORVC-ACS)。计算结果显示,ORVC-ACS具有最高的节能性和经济性,其节能功率可达1723 k W,折合节约电量15.1 GWh/a,空压机节能率达7.5%。ORC-VCR-ACS次之,其最高节约功率约为1268 k W,ORC-ACS的节能功率最低,其最高节能功率约为783 k W。ORVC-ACS的最高净现值约为9.9千万元,折现回收周期小于3.2年,具有较高的经济效益。ORC-VCR-ACS和ORC-ACS的最高净现值和最大折现回收周期分别约为9.7千万元、3.4年和4.4千万元、4.8年。此外,三个系统每年最多可节约二氧化碳分别为10.8、11.4和4.9百万吨,显示出巨大的环境潜力。 相似文献
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《Heat Recovery Systems and CHP》1995,15(7):665-673
This paper presents an investigation of the feasibility of heat recovery from the condenser of a vapour compression refrigeration (VCR) system through a Canopus heat exchanger (CHE) between the compressor and condenser components. The presence of the CHE makes it possible to recover the superheat of the discharged vapour and utilize it for increasing the temperature of the external fluid (water) removing heat from the condenser. The effects of the operating temperatures in the condenser and evaporator for different inlet water temperatures and mass flow rates on the heat recovery output and its distribution over the condenser and CHE (the fraction of the condenser heat available through the CHE), available outlet water temperature and heat recovery factor have all been studied and optimum operating parameters for feasible heat recovery have been ascertained. The parametric results obtained for different working fluids, such as R-22, R-12, R-717 and R-500, have been presented. It is found that, in general, a heat recovery factor of the order of 2.0 and 40% of condenser heat can be recovered through the Canopus heat exchanger for a typical set of operating conditions. 相似文献
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半导体制冷电脑CPU恒温散热研究 总被引:1,自引:1,他引:0
用风冷的方法给CPU降温存在着降温效率低、反应速度慢、风扇的机械转动可靠性差、噪音大等弊病.因此,这里设计了一种用半导体制冷降温的装置来提高CPU的散热效率.它用温度传感器检测电脑CPU温度,当CPU温度超过设定温度的时侯,控制电路供电使半导体制冷块制冷,使CPU温度保持恒定.为防止冷凝结露,采用绝热材料密封导热铜板及... 相似文献
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《Heat Recovery Systems and CHP》1989,9(3):183-187
The integration of hot and cold streams in processes of industrial plants is an important aspect for recovering heat and reducing energy consumption. This paper proposes a rapid analysis method on integrating hot and cold streams in industrial plants, whereby cost and profit for heat recovery can be worked out rapidly. Therefore the results can be used to determine whether a further detailed feasibility study should be carried out and optimal heat exchanger networks have to be synthesized. Meanwhile, an optimization method is also suggested for choosing the minimum optimal temperature difference in exchanger. And, on the basis of the method proposed, the computer program AIHCS has been compiled and applied to a practical case whose results fully verify the effectiveness of this (rapid analysis) method. 相似文献