制冷在油烟净化中的应用

从油烟、有毒有害废气净化的原理入手 ,结合对当前所采取措施的细致分析 ,提出将制冷装置引入到对油烟、废气的治理和控制思想 .依据这个思想 ,对制冷装置在油烟净化中的实际应用作了初步研究 .     

真空制冷循环实验仪

本实验仪是一种包括真空与制冷在内的实验设备，属于物理教学实验领域。它能够把热力学实验中的循环制冷实验，真空制冷、干燥实验与焦耳一汤姆孙、实验结合在一块。     

一种高效太阳能混合吸收式制冷循环系统

提出一种高效的较大程度利用热源的新型太阳吸收式循环系统，与传统的两级吸收式循环相比，系统增加了一个附加高压发生器，通过高压发生器再出生的LiBr溶液与低压吸器的吸收后的溶液混合，提高高压吸收器的吸收剂浓度从而减小其压力，分析了混合循环的各种性能特性，并与传统的两级吸收式制冷循环进行比较，结果表明混合吸收式循环的发生热源在80－95℃之间，热力系数在传统的两级吸收式循环基础上平均提高20％，其热源可利用温差平均提高20℃，效果较明显。     

HFC-227ea的MBWR状态方程

以文献提供的大量精确P订实验数据为基础，拟合了制冷工质七氟丙烷HFC-227ea的modified benedict—webb-rubin（MBWR）状态方程，给出了32个参数值．该方程适用压力从0．03至53MPa，密度从2．9至1800kg／m^3，温度从204至473K．将该方程计算的HFC-227ea的pVT数据与实验数据比较后表明：两者的气相压力平均绝对值偏差为0．296％，饱和蒸气压平均绝对值偏差为0．213％，液相密度平均绝对值偏差为0．148％．     

以城市污水为热(冷)源的供热与空调实验研究

研制了以城市污水为热(冷)源的供热与空调实验系统,采用间接换热的方法回收城市污水的热(冷)能,解决了由于污水水质造成的换热设备及管道的腐蚀问题,为实际工程应用奠定了技术基础。研究结果表明:该系统各项技术指标稳定,满足建筑物冬季供热及夏季空调的负荷要求;测得平均供热系数为3.20,平均制冷系数为3.64,具有良好的节能性和经济性。     

船用二氧化碳制冷装置形式及制冷剂

介绍了船用制冷系统的基本形式以及船用制冷剂的发展与选择，确定船用CO2制冷装置应采取跨临界循环形式．与常用氟利昂类制冷工质的主要性能指标进行对比，认为CO2将是最具有竞争力的替代制冷剂．针对CO2物性变化特点，重新界定了临界区域．分析了回热和CO2热物性对COP的影响，并结合船舶特殊的运行环境，对制冷系统的设计提出了若干建议，分析结果和建议对于天然替代制冷剂在船舶上的应用具有重要参考价值。     

Recent developments of thermoelectric power generation

One form of energy generation that is expected to be on the rise in the next several decades is thermoelectric power generation (TEPG) which converts heat directly to electricity. Compared with other methods, TEPG possesses the salient features of being compact, light-weighted,noiseless in operation, highly reliable, free of carbon dioxide emission and radioactive substances. Low current conversion efficiency and high cost, however, are some of the disadvantages. Use of TEPG is therefore justified to hightech applications associated with aerospace, military operation,tel-communication and navigation, instrumentation of unmanned vehicles monitored from remote locations. Moreover, TEPG does not contribute to the depletion of natural resource and pollution of the environment such as climate warming that has been a concern in recent times. This work is concerned with providing an overview of the state of the art of TEPG with emphases placed on assessing its current and potential application. Pointed out are the ways to fabricate high performance thermoelectric material, a hurdle to overcome for the enhancement of TEPG device efficiency.     

He-H2 mixture and Er3NiHx packing for the refrigeration enhancement of pulse tube refrigerator

The computation with the theory of modified Brayton Cycle indicates that higher cooling power and coefficient of performance for a pulse tube refrigerator can be achieved with He-H2 mixture as working gas than those with pure He in the temperature region of 30 K. In addition, it is found that Er3Ni, a regenerative material, is able to absorb H2 and produces Er3NiHx. The computation presents that the regenerative performance of Er3NiHx is better than that of Er3Ni due to its higher volume specific heat. Experimental results show that the pulse tube refrigeration performance in 30 K temperature region is enhanced greatly with He-H2 mixture and Er3NiHx packing.