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Journal of zhejiang University-Science A(Applied Physics & Engineering) 2007年第2期8卷 216-220页

作者： MAIGA Abdoulaye Siddeye, CHEN Guang-ming, wang Qin (institute of refrigeration and cryogenics, zhejiang University, Hangzhou 310027, China) institute of refrigeration and cryogenics zhejiang University Hangzhou 310027 China Ph.D student at zhejing University from Mali

Two adsorption refrigeration working pairs of zeolite with water and ethanol were studied and the parameters of Dubinin-Astakhov model were regressed using the experimental data of equilibrium. The coefficient of heterogeneity varied from 1.305 to 1.52 for the zeolite-water pair and from 1.73 to 2.128 for zeolite-ethanol pair. The maximum adsorption capacity varied from 0.315 to 0.34 for zeolite-water and 0.23 to 0.28 for zeolite-ethanol, respectively. The results showed that the zeolite-water pair is suitable for solar energy cooling not only because of the high latent heat of vaporization of water but also because of the better equilibrium performance. On the other hand, zeolite-ethanol gives a high adsorption capacity at high regeneration tem-perature, which means it can be used in heat engine systems like buses and cars.

关键词： Adsorption refrigeration zeolite Ethanol Water Equilibrium

DISPLACEMENT CONTrOL AND KINETIC ANALYSIS OF A NOVEL VArIABLE DISPLACEMENT COMPrESSOr FOr AUTOMOTIVE AIr CONDITIONEr

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Chinese Journal of Mechanical Engineering 2001年第4期14卷 325-329页

作者： Yuan Xiaomei,Chen zhijiu (institute of refrigeration and cryogenics Engineering, Shanghai Jiaotong University) 上海交通大学上海

A novel variable displacement compressor (VDC) for automotive air conditioner (AAC) is introduced, which inherits the advantages of common wobble plate type VDC. It has fewer parts and makes less noise, and instead of pneumatic valve the displacement is controlled by electronic control valve. In order to know the control mechanism well and get a good control effect, a mathematical model for the variable displacement mechanism is developed according to the geometrical and kinematical information of the compressor. Using the model, the effect of relevant parameters on variable displace control is estimated. It is helpful to make the optimum decision in the flow control of AAC. As the novel displacement control device, the structure and control rule of electronic control valve is introduced. It can get better effect than the conventional pneumatic valves. And by using this new electronic control device, the optimum systemic control of AAC is available.

关键词： Displacement control Kinetic analysis Automotive air conditioner (AAC) Variable displacement compressor(VDC)

rESEArCH ON MEASUrING METHOD OF THE THErMALCONDUCTIVITY FOr HIGHLY POrOUS MATErIALS

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Acta Metallurgica Sinica(English Letters) 1997年第3期10卷 213-218页

作者： J Y Wu z.M. Tang W Shi andr.z. wang (institute of refrigeration and cryogenics Engineering, Shanghai Jiao Tong University, Shanghai 200030,China) Shanghai Jiaotong Univ Shanghai China

A transient method with rectangular pulse heating has been developed to measure the thermal conductivity of highly porous materials such as activated carbon, zeolite and silica gel. By this method the thermal conductivity can be measured quickly and accu-rately. In this paper, a set of automatically controlled testing equiptnent is *** measuring method is analysed. The thermal conductivities of some samples, such as activated carbon and zeolite, are measured by the equipment. A group of useful data has been obtained.

关键词： thermal conductivity porous material thermophysical property

PrESSUrEEFFECTONTHEHEATTrANSFErINBATHOFSUPErFLUIDHELIUM

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Journal of Shanghai Jiaotong university(Science) 1996年第1期1卷 12-17页

作者： wang ruzhu zhang Peng (institute of refrigeration and cryogenics)

Considering the basic heat transfer rules of superfluid helium and the phase diagram of helium, pressure effects on heat transfer to HeⅡ are especially studied. If the bath pressure is less than λ pressure ( P λ ), special peak heat flux density relations are shown to correlate bath pressure, hydrostatic head and modified pressure items (Van der waals pressure and fountain pressure). If the bath pressure is greater than λ pressure( P>P λ), a generalized formula of peak flux density of HeⅡp bath is shown.

关键词： superfluid helium hydrostatic pressure Van der waals pressure fountain pressure heat transfer peak heat flux density

Development of an automatic calibration device for high-accuracy low temperature thermometers

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Science China(Technological Sciences) 2010年第9期53卷 2404-2407页

作者： CHEN GuangMing,GAO Xu,zHANG Shaozhi,CHEN Qi,TANG LiMing & LAN YuQi institute of refrigeration and cryogenics,zhejiang University,Hangzhou 310027,China institute of refrigeration and cryogenics Zhejiang University Hangzhou China

Based on the analysis and investigation of calibration systems for high-accuracy low temperature thermometers,a new facility for automatic calibration of high-accuracy low temperature thermometers was *** calibration for multiple points can be made automatically with this *** to the thermophysical characteristics of the constant-temperature block in this device,segmented Fuzzy-PID (proportional-integral-differential) algorithm was *** experimental results showed that the temperature fluctuation was smaller than ±0.005 K in 30 ***,this new device can fully meet the calibration requirement of high-precision low temperature thermometers.

关键词： calibration low temperature thermometer control algorithm

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一种具有强化自然通风效果的太阳能空调房

太阳能学报 2003年第3期24卷 283-289页

作者：代彦军王如竹上海交通大学制冷与低温工程研究所上海200030

提出一种依靠吸附制冷原理制冷 ,结合太阳能通风筒强化自然通风的太阳能空调房 ,其特点在于一方面可充分利用太阳能吸附集热器和太阳能通风筒集热面有效降低房间的太阳热负荷 ;另一方面利用吸附床吸附制冷过程释放大量吸附热的现象 ,用... 详细信息

提出一种依靠吸附制冷原理制冷 ,结合太阳能通风筒强化自然通风的太阳能空调房 ,其特点在于一方面可充分利用太阳能吸附集热器和太阳能通风筒集热面有效降低房间的太阳热负荷 ;另一方面利用吸附床吸附制冷过程释放大量吸附热的现象 ,用于强化夜间自然通风。该文针对房间的通风率、进风温度变化等进行了分析 ,结果表明 ,典型条件下 ,采用 2 .5m2 的太阳能通风筒集热面、5m2 的吸附制冷系统集热面 ,一间 2 0m2 的太阳房日间通风率可达 10 0kg/h ,夜间通风率则可进一步提高 30 %～ 4 0 %。和其它空调装置相结合 ,该太阳房可用作独立式住宅 ,粮仓等。

关键词：吸附制冷自然通风太阳能通风筒吸附热太阳能空调房

Effects of Ice Nucleation Bacteria on Water/Solid Model Food Freezing

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Effects of Ice Nucleation Bacteria on Water/Solid Model Food...

2008国际低温与制冷大会

作者： zhang S z wang H Y Chen G M institute of refrigeration and cryogenics zhejiang University Hangzhou 310027 P.r.China

＜正＞Cells of ice nucleation active（INA） bacteria,Pseudomonas syringae,was cultured at 26℃with nutrient agar culture medium and harvested at early stationary phase（20h） for maximum ice nucleation *** cells were incorporated into water or solid model food to investigate their effects on degree of supercooling and characteristic freezing *** freezing temperatures were used,-15℃and -30℃.It was found that the degrees of supercooling of model foods with INA were reduced by 3℃to 4℃at all freezing *** characteristic freezing time was *** results imply that the ice nucleation bacteria may be used to modify the freezing process to save energy and the effects will be more obvious for higher freezing temperature and smaller sample size.

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微型通道冷凝器数值模拟与分析

上海交通大学学报 2009年第2期43卷 251-255页

作者：邵世婷王文上海交通大学制冷与低温工程研究所上海200240

单相区选用合理的预测关联式,两相区采用均相模型,对微型通道形成的平行流式冷凝器进行了性能模拟,对制冷工质r134a进行设计工况下的稳态模拟,得出了微通道换热器的设计结果.分析了微通道换热特性与经典关联式模拟结果的差异,及迎面风... 详细信息

单相区选用合理的预测关联式,两相区采用均相模型,对微型通道形成的平行流式冷凝器进行了性能模拟,对制冷工质r134a进行设计工况下的稳态模拟,得出了微通道换热器的设计结果.分析了微通道换热特性与经典关联式模拟结果的差异,及迎面风速、外侧翅片布置、管道尺寸、外侧空气温度变化、冷凝器进口状态对换热器设计的影响;并比较了与常规尺度翅片管换热器的区别.可为设计及分析微型换热器的性能提供参考.

关键词：微通道冷凝器均相模型模拟

Large low-field reversible magnetocaloric effect in K_(3)Gd(PO_(4))_(2) at sub-Kelvin temperature

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Journal of rare Earths 2024年第6期42卷 1087-1092,I0003页

作者： Haojie wang zhaojun Mo Jianjian Gong Heng Tu Guochun zhang Jun Shen School of rare Earths University of Science and Technology of ChinaHefei230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341119China Center for Crystal research and Development Key Laboratory of Functional Crystals and Laser TechnologyKey Laboratory of CryogenicsTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China Department of Energy and PowerEngineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China

We synthesized a potassium gadolinium phosphate K3Gd(PO_(4))_(2)with monoclinic structure(P2_(1/m))by the high-temperature solid-state reaction *** lattice constants obtained by rietveld refinements of XrD curve are a=0.7411 nm,b=0.5624 nm,and c=0.9433 *** and magnetocaloric properties of K_(3)Gd(PO_(4))_(2)were investigated in *** magnetic phase transition temperature of K3Gd(PO_(4))2 was determined by ultra-low temperature testing to be 0.58 K.K_(3)Gd(PO_(4))2 exhibits large magnetic entropy changes(-ΔSM).The maximum-ΔSM are 20.2 and 29.4 J/(kg·K)in the magnetic field variation(ΔH)of 1 and 2 T,respectively,which are larger than that of the commercial Gd_(3)Ga_(5)O_(12)(GGG).The maximum adiabatic temperature change(ΔT_(ad))reaches 5.91 K under a magnetic field change(ΔH)of 1 T.K_(3)Gd(PO_(4))_(2)is a potential magnetic refrigeration material for obtaining sub-Kelvin temperatures.

关键词： Ultra-low temperature Magnetocaloric effect Magnetic entropy change Magnetic refrigeration rare earths