最新刊期
      卷 27 ， 期 1 ， 2006
      • Vol. 27, Issue 1, Pages: 1-8(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.001
        摘要：Space refrigerationtechnologyis one of the keytechnologies which restrict the development of the spaceborneinfraredremote sensor technology.Because the infrared remote sensor systemrequires refrigerators that can providegreater cooling capacity andlower refrigerating temperature,the space mechanical cryocooler gradually becomes maindevice of space refrigeration.In this paper,the current engineeringresearch of domestic andforeign space mechanicalcryocooler is reviewed.In particular,the technological problems needed to pay much attention during the developingprocess of space mechanical cryocooler are described combined with JPL technical report about space mechanical cryo-cooler in recent10years.  
          
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      • Vol. 27, Issue 1, Pages: 9-14(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.002
        摘要：Heat transfer coefficients in nucleate boiling on a smooth flat surface were measured for pure fluids of R-134a,propane,isobutene,and their binary and ternary mixtures at different pressures from 0.1 to 0.6 MPa. Series of experiments with different heat flux and mixture concentrations were conducted.Compared with the pure components,binary mixtures show lower heat transfer coefficients.This reduction was more obvious at the high heat flux.Several heat transfer correlations were obtained for pure refrigerants and multicomponent mixed-refrigerants.  
          
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      • Vol. 27, Issue 1, Pages: 15-22(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.003
          
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      • Experimental Study on Dimethyl Ether(DME) Used As Refrigerant

        Vol. 27, Issue 1, Pages: 23-27(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.004
          
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      • Numerical Simulation and Study of Refrigerant Circuitry in Evaporator

        Vol. 27, Issue 1, Pages: 28-33(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.005
          
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      • Vol. 27, Issue 1, Pages: 34-37(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.006
        摘要：Experimental study was conducted for components separation of nonazeotropic ternary mixture R407C.The experimental result shows that the type of separator and the power added on the separator have different effects on the separation efficiency.After being separated,the component of R407C is changed obviously and the separation effect is satisfied with highest component ratio of 48.71% and 98.23% for R32 and R134a respectively.  
          
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      • Vol. 27, Issue 1, Pages: 38-41(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.007
        摘要：Rectifies of various guide vane angles which is used in vortex tube had been designed and fabricated.A reliable test rig had been designed and constructed to investigate the effect of rectify and its vane angle on the energy separation performance,rectify on the length/diameter ratio of a vortex tube system.The comparison experiments have been carried out using the aforesaid vortex tube and the tube of the same type made in ARTX Company.The results show that the unit refrigeration of the vortex tube with the rectify is increased by 12%~44% than that without rectify when the cold mass flow ratio is 50%~80%,the bigger angle of the rectify the better refrigeration effect is got with the cold mass flow ratio less than 70%,the length/diameter ratio of the vortex tube with rectify is decreased 6.4 times without impairing the refrigeration,and the aforesaid vortex tube gets better refrigeration effect than that made in ARTX company when the cold mass flow ratio is bigger than 60%..  
          
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      • Vol. 27, Issue 1, Pages: 42-44(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.008
        摘要：Based on the application of electric-heating equipment in air conditioning system with air-cooled water chilling(heat pump) packages, the concept of the seasonal integrated COP of the air conditioning system with air-cooled water chilling(heat pump) packages in heating operation was presented.The factors affecting the COP and the design technology of electric-heating equipment were also discussed.The results show that the environmental condition is the most important factor which effects the seasonal integrated COP of the air conditioning system.In addition,the COP of the heat pump system,the location,the power,and the control of the electric-heating equipment are also the affecting factors.  
          
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      • Vol. 27, Issue 1, Pages: 45-48(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.009
          
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      • Study on Optimization Matching of Catcher and Vacuum pump in Vacuum cooling

        Vol. 27, Issue 1, Pages: 49-52(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.010
        摘要：The matching of the catcher and the vacuum pump determines the pre-cooling quality during vacuum cooling processes.With the assumption of the water vapor resulted from the vacuum cooling to be ideal gas,the energy consumptions of the catcher and the vacuum pump needed in cooling were calculated,respectively.The total energy consumed of the system was also calculated.The vacuum pre-cooling experiment for the cabbage at the 60% package rate was performed.The results show that under a known working condition,the energy consumption per second is only dependent on the sucking rate of the vacuum pump,and the total consumed energy is dependent on the type of fruits or vegetables needed to be cooled and has no relations with the system parameters.  
          
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      • Optimization on Performance of Regenerative Brayton Refrigeration Cycle

        Vol. 27, Issue 1, Pages: 53-57(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.011
        摘要：Based on an irreversible model of a regenerative Brayton refrigeration cycle,expressions for several important performance parameters such as the cooling load,coefficient of performance,and power input,and the optimal relation between the cooling rate and the coefficient of performance were derived.The influence of regeneration and several irreversiblities on the optimal performance of the cycle was investigated.The optimal operating region and the performance bounds of the cycle were discussed.The optimal heat-transfer areas were determined.The influences of the design parameters on the cooling load,coefficient of performance,and power input of the cycle were studied with numerical calculation.  
          
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      • Research on R600a Energy-saving Compressor

        Vol. 27, Issue 1, Pages: 58-62(2006) DOI: 10.3969/j.issn.0253-4339.2006.01.012
        摘要：The factors influencing the COP of compressors were analyzed The compression efficiency was increased by adopting the non-valve guard suction reed valve and thin steel valve plate,using semi-direct suction manner and muffler,optimizing heat transfer of the suction inlet and cylinder head,and changing the diameters of the suction hole and discharge hole of the valve plate and inner-discharge pipe.Applying the slender crankshaft,the level rolling bearing technology,and lower viscosity refrigeration oil,increased the mechanical efficiency.The design of the motor was optimized by adopting RSCR motor with optimizing capacitor design,using high magnetic strength and low dissipation silicon-steel sheet,raising the height of stator,and increasing the main coil.The processing accuracy of the component,the fit-up gaps of the moving parts, the requirements of gas tightness detection,and the fit-up technology of the rotors and stators were proposed.The experiments and comparisons show that the COP of this newly developed R600a compressor can reach 1.75.  
          
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