最新刊期
      卷 32 ， 期 3 ， 2011
      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.001
        摘要：The final test report for ignition behavior of R1234yf was published by BAM,Germany in June of 2010.It pointed out that HF exposures from thermal decomposition or combustion of R1234yf would be likely to results in personal injury.At the end of the year,there was also a concern on the R32 in China.Hence,these issues are analyzed based on chemical reaction kinetics,toxic gas exposure limit allowed,and with reference to SAE results.It is found that when R1234yf leads to the generation of excessive concentrati...  
        关键词：engineering thermophysics;Refrigerant;Ignition;Generation of toxic gases;R32;R1234yf;R134a   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.006
        摘要：Regenerator is a key part of regenerative cryocoolers,and it gives predominant contribution to the performance of cryocoolers.In this paper,the recent development of regenerator in regenerative cryocoolers is described.Stacked mesh screens,parallel wires,sphere beds,parallel plates,random wire,mesh screens & packed spheres mixed packing are the commonly used configurations for regenerators,and the characters of different regenerators are discussed separately.It is suggested that the regenerator should be as...  
        关键词：pyrology;regenerator;Regenerator thermal efficiency;Flow friction factor;Axial conduction loss   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.015
        关键词：engineering thermophysics;separate heat pipe;microchannel heat exchanger;heat transfer performance;R134a   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.020
        摘要：Pure refrigerants are widely used in air conditioning and heat pumps due to the characteristics of no temperature glide and no composition variable during leaking compared with refrigerant mixtures.This paper presents a detailed review of research work on condensation inside horizontal tubes of pure refrigerants in the literature,from theoretical and experimental study,which is of significance in refrigeration,air conditioning and heat pump applications.The applicability and limitation of correlations of co...  
        关键词：engineering thermophysics;thermal engineering;condensation heat transfer;review;Pure refrigerant;Heat transfer model   
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        发布时间：2024-08-02
      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.029
        摘要：The performance of fin-tube heat exchanger is variable with not only condition parameters,but also structure parameters.So a performance analysis model was established to comprehensively analyze and to predict the performance of fin-tube heat exchanger with variable condition and variable structure.The calculated results of the model were verified by the experimental data: the mean relative deviations are lower than 6% under dry conditions or 20% under wet conditions,which show a good agreement both in nume...  
        关键词：engineering thermophysics;fin-tube heat exchanger;Digital design;Variable condition;variable structure   
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        发布时间：2024-08-02
      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.038
        关键词：pyrology;solar;numerical calculation;absorption refrigeration;COP   
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        发布时间：2024-08-02
      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.042
        摘要：A simultaneously solving model is presented under the low sidewall air supply system of thermal stratification environment in large space building.The model is used to predict indoor vertical air temperature and inner surface temperature,as well as the cooling load.Through the summer experiment in a large space building,the indoor air vertical temperature,inner surface temperature and cooling load are tested,the calculated results of simultaneously solving model are compared with the test data,and the resul...  
        关键词：municipal engineering;Stratified air conditioning system;Vertical temperature distribution;model;Cooling load   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.048
        关键词：pyrology;Gas liquefaction;Conventional compressor;Mixed refrigerant cycle;Temperature reducing characteristic;Composition optimization   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.053
        摘要：A new scheme,which takes nitrogen as a cold source and utilizes a micro-throttle refrigerator to cool the nitrogen,is presented for satisfying the temperature-drop demands of cryomicroscope.An elementary diagram of cryo-microscope's novel cold source system is given.To determine the parameters of throttle tubes(internal diameter and length),the optimum throttling pressure,temperature drop,the refrigerating capacity and nitrogen consumption,three experiments was conducted.The results show that the internal d...  
        关键词：pyrology;Cryo-microscope;Micro-throttle refrigerator;Low-temperature system   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.056
        摘要：When cooling is needed in transition season and winter,there is always a problem with centralized air-conditioning system that too much cooling is produced.If we use both air-energy saving system and water-energy saving system instead of the direct cooling of chiller,we can save much energy and water.In this paper,the operation strategies of air-energy saving system and water-energy saving system is introduced and its control strategies in different seasons are determined.Case analysis shows that this solut...  
        关键词：pyrology;central air-conditioning system;Air-energy saving system;Water-energy saving system;Directly cooling;energy saving   
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        发布时间：2024-08-02
      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.060
        关键词：Package and preservation of food;Vacuum pre-cooling;Cake;Growth kinetics model;Shelf life prediction   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.065
        摘要：Micro-Vacuum storage facility is a mild vacuum-storage apparatus,which was on the basis of conventional vacuum-storage,by adding a flexibility air sac to overcome the stress of facility wall and the higher weight loss under vacuum storage.The structure principle and main component of micro-vacuum storage were introduced,with the emphasis on the materials and functions about air sac,vacuum systems and control systems device.It also discussed the fresh-keeping effect of Laiyang pear on this micro-vacuum stora...  
        关键词：Package and preservation;Micro-vacuum storage facility;experiment;Laiyang pear;Keeping-fresh   
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      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.070
        摘要：A vacuum freeze-drying device was built and combined with differential scanning calorimetry(DSC) and microscopy,namely hereafter the freeze-drying system coupled by DSC and microscopy.By using the freeze-drying system coupled by DSC and microscopy,the freeze-drying experiments were carried out on a cryoprotectant aqueous 10%(g/g) trehalose solution supplemented with 1%(g/g) polyvinyl alcohol in order to investigate the effects of freezing condition,especially freezing rate and filling volume of the solution...  
        关键词：pyrology;freeze-drying;DSC;pre-freezing;Ice crystals   
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        发布时间：2024-08-02
      • Vol. 32, Issue 3, (2011) DOI: 10.3969/j.issn.0253-4339.2011.03.074
        摘要：Eight types of experimental conditions were designed to test the performance of the self-made gas J-T cooling radiofrequency probe and evaluate its feasibility and efficacy.The temperatures which were 0.5cm,1.0cm,1.5cm away from the wall of RF probe and the ablation time were recorded in real time to evaluate the effects of nitrogen pressure,RF power and cooling mode on the results of RFA.The results indicated that the gas J-T cooling RF probe could significantly prolong the ablation time and create the hig...  
        关键词：pyrology;Gas J-T cooling;Radiofrequency probe;temperature;Ablation time   
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