高效节能冰激凌机直冷式冷冻缸蒸发器的设计

这里介绍了一种高效节能的冰激凌机螺旋翅片直冷式圆形冷冻缸蒸发器，并指出其实现的关键技术。     

聚氯乙烯厂混合冷冻脱水装置的技术改进

分析了聚氯乙烯厂电石法生产PVC混合冷冻脱水装置存在的问题，阐述了混合冷冻脱水的原理及易地改扩建过程中的技术改进。     

制冷压缩机气阀的计算机辅助设计

本文建立了制冷压缩机环状阀设计计算的数学模型,编制了气阀CAD软件。能够快速计算气阀主要结构参数和性能参数,模拟气阀运动规律,并对气阀结构进行优化设计,使设计出的气阀既能满足压缩机性能的要求,也能提高本身的寿命。     

节能降耗的氨吸收制冷工艺

粗煤气净化采用氨吸收制冷工艺为低温甲醇洗提供冷量,两级精馏,三级吸收。粗煤气的余热代替蒸汽为精馏系统提供热源。粗煤气热量转移给氨蒸发过程所需的热量,既节省氨蒸发加热用蒸汽量,又节省冷却介质。降低了投资费用和运行费用。     

大型冷冻机组净化回收系统的改造设计

文中阐述了某大型冷冻机组的净化回收系统的设计改造。实施技术改造措施后,提高了原冷冻机运行可靠性和制冷剂F-11回收率,为企业创造了可观的经济效益,同时大幅减少制冷剂F-11的排放,对保护生态环境有重要意义。     

A general methodology for energy comparison of intermediate configurations in two-stage vapour compression refrigeration systems

The aim of the present paper is to describe a general methodology suitable for analysing any intermediate configuration considered in staged vapour compression refrigeration cycles. This general methodology only depends on two basic parameters related to the subcooling and desuperheating obtained in the inter-stage system. A COP expression based on the two basic parameters was obtained from the general configuration. By means of its particularization to seven common configurations, it was then possible to make an energy comparison of the various configurations working with two fluids appropriated for the low temperature domain such as ammonia and R-404A.     

制冷剂对全球环境的影响及其替代的选择

论述了CFC类和HCFC类制冷剂对破坏大气臭氧层的影响和温室气体对全球气候变化的影响,探讨了如何正确协调《蒙特利尔议定书》与《京都议定书》的要求,着重分析了几种替代制冷剂的特性,阐述了在实际使用中如何进行替代制冷剂的选择。     

Metal hydride air conditioner

The relationship among the hydrogen storage properties, cycling characteristics and thermal parameters of the metal hydride air conditioning systems was investigated. Based on a new alloy selection model, three pairs of hydrogen storage alloys, LaNi4.4 Mn0.26 Al0.34 / La0.6 Nd0.4 Ni4.8 Mn0.2 Cu0. 1, LaNi4.61Mn0. 26 Al0.13/La0.6 Nd0.4 Ni4.8 Mn0.2 Cu0. 1 and LaNi4.61 Mn0.26 Al0.13/La0.6 Y0.4 Ni4.8 Mn0. 2, were selected as the working materials for the metal hydride air conditioning system. Studies on the factors affecting the COP of the system showed that higher COP and available hydrogen content need the proper operating temperature and cycling time,large hydrogen storage capacity, flat plateau and small hysterisis of hydrogen alloys, proper original input hydrogen content and mass ratio of the pair of alloys. It also needs small conditioning system was established by using LaNi4.61 Mn0.26 Al0. 13/La0.6 Y0.4 Ni4.8 Mn0.2 alloys as the working materials, which showed that under the operating temperature of 180℃/40℃, a low temperature of 13℃ was reached, with COP =0.38 and Wnet =0.09 kW/kg.     

溴化锂吸收式制冷机高真空度的保持

真空度下降会引起溴化锂制冷机制冷量下降，机组使用寿命缩短，溶液性能及循环状况恶化。给出了保持机组高真空度的一些措施。     

某钢铁厂蒸汽余热用于夏季制冷的可行性分析

介绍了单效溴化锂吸收式制冷机的工作原理,以某钢铁厂日排放蒸汽量为基础数据进行了热力计算。与其他制冷方法的比较结果表明,以蒸汽余热为热源的溴化锂制冷机节能减排效果明显,同时具有较好的经济性,在余热资源丰富的地区有较好的推广价值。