最新刊期
      卷 26 ， 期 3 ， 2005
      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.001
        摘要：For parallel - flow type condensers, the louvered fin is adopted for air side and the micro- channel with rectangle sections and small hydraulic diameter is adopted for refrigerant side. The formulas suitable to this special configuration were presented to calculate the heat transfer coefficient and pressure drop. Then the mathematic model was established to simulate the performance of the condenser. The results show that during the process of flow and condensation of the refrigerant, surface tension plays a significant role in the enhancement of heat transfer. In the parallel flow type condenser with gradually decreasing flow section areas, it can keep high heat transfer coefficient and low pressure - drop.  
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.002
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.003
        摘要：Pre- cooling is the first working procedure after vegetable is harvested. It is important to keep vegetable's freshness. In our research, Chinese cabbage, cucumber, lettuce, and forest mushroom were used for experimental samples. Their experimental data of vacuum pre- cooling were obtained and compared..  
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.004
        摘要：In this study, Fluent as a computational fluid dynamic software was used to simulate the process of unsteady heat conduction and convection of the air in an air - conditioning room during the start - up process of the air - conditioning instruments. On the basis of the flying- rising curves obtained from the process of the simulation, a mathematics model established to reflect the dynamic response of the air in the air - conditioning room during the air - conditioning instruments starting up was analyzed and testified through start- up experiments under various out- door temperature.  
          
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      • Design and Experimental Research on A Heat Pump Water Heater with PCM

        Zhang Haifeng, Wang Qin and Chen Guangming Zhejiang University, Hangzhou, China
        Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.005
        摘要：A new kind of Heat Pump Water Heater with PCM (Phase Change Materials) for thermal storage is introduced. The structure and principle are described. The feasibility and advantage of the water heater application has been testified by some primary results. The economic advantage of this kind of heat pump water heater is stated by comparison with other kinds of water heater.  
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.006
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.007
        摘要：Charge and leak processes of zeotropic refrigerant can cause the change of mixture concentration in refrigerant systems and affect the system performance. The concentration change character of R407A/B/C/D was investigated and the concentration characteristic line was obtained. The performance change of refrigerant systems along the characteristic line was analyzed.  
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.008
        摘要：On the basis of the molecular- field theory and thermodynamics of magnetic system, the relation between heat and magnetic entropy change of the regenerative room - temperature magnetic Ericsson refrigeration cycle was analyzed in our study. Moreover, the influence of the temperature of heat reservoir on the performance of ferromagnetic magnetic Ericsson refrigeration cycle was investigated. The numerical simulation for the magnetic refrigeration cycle with typical ferromagnetic material Gadolinium was conducted. The results show that there will be an important turn of the cycle performance near the Curie temperature. Whenever temperature is higher than Curie temperature, only the condition of occurs, otherwise, both conditions appear. In addition, the maximum of high- temperature heat reservoir increases with the increase of low- temperature heat reservoir. And for the same heat reservoir, the increase rate ofde-creases while magnetic field strength increases.  
          
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      • Solidification Properties of Polyalcohols Aqueous Solution Studied by DSC

        Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.009
        摘要：In order to examine possible relations between freezing properties and the number of hydroxyl groups in solute molecules, a differential scanning calorimeter (Pyris- Diamond DSC) was employed to study the thermal behaviors of polyalcohols aqueous, such as hydration properties, glass transition, and devitrification. The experimental results show that at the low concentrations hydration behaviors have no disciplinarians. However, at the high concentrations, they accreted as the concentrations increase. At the middle and low concentration, the aqueous solutions formed partially amorphous glassy state. The temperature of partially glass transition did not change with solution concentration. But, at the high concentration, the aqueous solutions formed completely amorphous glassy state and the temperature of glass transition increased with concentration. The distinct otherness in glass transition and devitrification temperature of five polyalcohols reflected the feebleness and power in the aspects of glass transition ability.  
          
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      • Gas Forces Analysis of The Twin - scroll Compressors

        Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.010
        摘要：On the basis of the analysis of each gas force in the twin - scroll compressors, the calculation formulae of working volume and each gas force at all different crankshaft angles were derived. Comparing single - scroll compressors with twin - scroll compressors with the same displacement volume shows that the gas forces of the latter is about 1.1-1.5 times as large as those of the former and the gas forces fluctuation of twin - scroll compressors is about 1/3 -1/5 times as large as that of the former. The twin - scroll construction is more suitable for the request of the large displacement volume. By the analysis of the geometrical relation between the integer cycle two spirals and the arbitrary cycle two spirals, the gas forces models in the arbitrary cycle twin- scroll compressors were established.  
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.011
        摘要：Plate falling film absorber with a film - inverting configuration is a new kind of absorber that combines the plate falling film absorption technique and the film - inverting technique. In this study, the absorber's structure under design condition was determined by building and solving mathematical model of the plate falling film absorption process with film inverting configuration. The heat and mass transfer performances were calculated by the model under different solution flow rates, its inlet concentrations, its inlet temperatures, absorption pressures, and cooling conditions. Then the comparisons were performed between the new designed film - inverting absorber and the designed vertical plate falling film absorber.  
          
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      • Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.012
        摘要：A new kind of method and device based on ultrasonic atomization technology and MCU(Micro Controller Unit) control technology were presented to eliminate water droplets in air- conditioner. The system hardware structure and software control processes were analyzed. The test data were processed with MATLAB. This kind of device has good effect in the actual operation.  
          
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      • Study on Comfort and Energy Conservation of CI Control

        Issue 3, (2005) DOI: 10.3969/j.issn.0253-4339.2005.03.013
        摘要：Control strategies and algorithms of comfort- index(CI) control were proposed on the basis of the factors to influence thermal comfort. Moreover, an air- conditioner system model was presented and simulation study on Cl control was conducted with the model. The simulation results show that Cl control can provide superior performance over conventional control in comfort and energy utilization.  
          
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