实验室作为“现代化大学的心脏”,它的规模化水平直接决定着高校办学水平的高低.但目前实验室在快速建设发展的过程中,存在实验项目开出率低、实验设备利用率低、实验类型较单一以及闲置、报废的实验设备综合再利用率低等突出问题,优化实验室资源配置、扩展性升级改造实验设备和提升实验设备综合利用率将是解决目前问题的有效方案.

以蓝牙4.0低功耗芯片CC2540BL E为核心构建低功耗便携式防丢器.防丢器由主机、从机两部分组成,各部分均由CC2540模块、声音报警模块、光报警模块和电源模块等构成;通过对核心芯片间RSSI值的处理实现防丢功能.

In order to meet the requirements of Building Environmental Equipment Engineering and Thermal Energy Power Engineering to set up comprehensive,designed,research experiment,according to the basic testing principles and methods about the heat pump performance in engineering thermodynamics,heat transfer,heat pump technology,heat exchangers principle and design,and so on,five design schemes of water source heat pump performance test board are designed in view of the present testing standards and specifications of water source heat pump.With the characteristics of high degree of automation,high control accuracy,system comprehensive functions,remarkable energy saving and strong innovative,the scenario five is the optimal design scheme through comparative analysis of their respective characteristics.

Experimental study on condensation heat transfer are conducted over three horizontal doubly-enhanced tubes.Wilson's thermal resistance discretization are used to calculate inner enhancement rate,some influent factors are studied,too.Experimental and calculating results indicate that with the increase of inner fin height,the enhancement rate is increased,within the tube parameters studied by this paper.The reason is that the convexes of helical rib results in the fluid periodic disturbances and enhances the heat transfer.

A test study on effectiveness of desulfurization through coal pyrolysis of Heshan raw coal has been carried out by using a fixed bed reator system under inert atmosphere,investigating mainly the influence of pyrolysis temperature and pyrolysis time upon the variation of volatile matter and sulfer content in coal.It has been discovered from the study that:the loss of volatile matter is increasing along with the rise of pyrolysis temperature,however,the sulfer content in carbocoal is increasing at first,and then decreasing,and has a tendency to increase again;along with the pyrolysis time being lengthened,the loss of volatile matter has increased,but the sulfer content in carbocoal being increased at first,and then being decreased,and has a tendency of stabilization in variation.Only enhancing the pyrolysis temperature or lengthening the pyrolysis time is unfavourable to improve the effectiveness of desulfurization.

The raw Heshan coal was pyrolyzed in a fixed-bed reactor in oxidative atmosphere to examine the sulfur removal efficiency and the volatilization content.The effect of temperature and time on sulfur was studied.The results show that the volatilization content increased and the sulfur content in char increased at the beginning,then decreased with pyrolytic temperature becoming higher;the volatilization content increased and the sulfur content in char increased at the beginning,then decreased with pyrolytic time becoming longer.

This paper presents a building automation system whose components and functions are discussed in detail.The automation system is an integrated test-bed of the building automation control system built for the undergraduate and postgraduate students of building environment and faculties engineering.And it establishes stable foundation for the development of relative discipline.

Based on the characteristics of heat and mass transfer, the aspects of affecting performance enhancement for evaporative condenser in refrigeration system were theoretically analyzed in the paper. Finally, researches, applications and developments of evaporative condenser are introduced.

In this paper,discharge velocity was studied by experimenting for ice-on-coil of three different densities during discharging,on the variable density direct ice-on-coil storage experiment platform.The result indicated,compared with the low density ice-on-coil,the high density ice-on-coil's period of low temperature discharge time prolonged nearly by 69%,and discharge velocity increased nearly by 97%,as a result,this kind of ice-on-coil can perfectly meet the special requirement of air-conditioning consuming cold storage more and concentrated during the electric peak time by day.

Electric heater is widely used in food refrigerated display cabinets to defrost because of its simplicity and feasibility,but only 15 percent of the total heat is useful and the left enters into load volume,which will influence quality of displayed foods and enhance energy consumption of refrigeration system. The improved defrost system of refrigerated display cabinets can increase refrigeration efficiency and is almost not bad for the quality of these displayed foods when defrosting,because the novel system use the cold capacity of frost to supercool refrigerant liquid,and meantime use the hot refrigerant liquid to defrost,the speed of which is acceptable. Technical and economic analysis method is used to analyze this new system,and adopt dynamic invest callback period as economic estimate guideline by considering time value of capital.

Experimental study on the room air-conditioners heat transfer capacity is conducted on the air enthalpy experimental set.The condensers of the two room air-conditioners consisting of general internal helical rib tubes and spiccato internal helical rib tubes respectively.During the test,the evaporators are the same,and the refrigerant capacities are the same,too.Experimental results indicate that the spiccato internal helical rib is prior to the general one on condensation heat transfer.The cooling capacity of the room air-conditioner 2,which consists of the spiccato internal helical rib tubes,is 0.6 percentages larger than that of the room air-conditioner 1 which consists of the general ones.In addition,the parameters of the room air-conditioner 2 are improved,and the total cooling power input is reduced.The result is that the energy efficiency ratio has increased 4.1 percentages.

The current investigation status of low-temperature water floor radiant heating system is introduced,including the characteristic parameters of this system,heat source,control strategies,optimization design,and so on.The existing problems of current researches are pointed out,then the application status quo and development of this system are analysed briefly.