最新刊期
      卷 27 ， 期 3 ， 2006
      • Vol. 27, Issue 3, Pages: 1-4+29(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.001
        摘要：A dynamic model of performance analysis for valve-controlled metal hydride heat pumps was established.Computing simulation was used to explore the operation of valve-controlled metal hydride heat pumps.The effects of intermediate temperature,specific heat at constant pressure,mass ratio of hydride to the beds,and heat transfer coefficient on the dynamic performances were obtained.The results show that higher intermediate temperature will reduce both COP and cooling capacity,and specific heat at constant pressure of hydride beds can not affect COP and cooling capacity greatly.Moreover,improving mass ratio of hydride to the beds can improve COP but reduce the cooling capacity.Further,improving heat transfer coefficient can improve COP and cooling capacity significantly.On the basis of our computing results,some measures were proposed to improve the dynamic performance of the system.  
          
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      • Experimental Study of Pool Boiling Heat Transfer on Enhanced Tubes

        Vol. 27, Issue 3, Pages: 5-9(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.002
          
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      • Vol. 27, Issue 3, Pages: 10-13(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.003
        摘要：Rich surface water resources in south China can be utilized as heat source-sink for heat pump systems.A district heating and cooling system that utilizes lake water as heat source-sink of heat pumps has been constructed in Xiangtan,a city in Hunan province in south China.The lake water temperature distribution during continuous operation was simulated before the construction.The entering water temperature was monitored everyday.COP values of the system and ASHP units at different source and sink temperatures were determined based on a series of measurements.The field test results show that the surface water heat pump system could offer advantages over air source heat pumps,such as higher energy efficiency and improved reliability.  
          
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      • Study on Startup Performance of Flat-type of CPL Evaporator

        Vol. 27, Issue 3, Pages: 14-17(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.004
        摘要：The startup process of CPL(Capillary pumped loop) was analyzed.Then a mathematical and physical model concerning CPL evaporator startup was established and the numerical method was applied to obtain the startup performance.A flat type CPL test-bed was designed and built.The results show that the numerical results agree well with the experimental data.In addition,the effects of different evaporator configurations on the startup characteristics were investigated and some methods and measures were discussed and presented to improve the startup performance and enhance the CPL operating stability.  
          
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      • Vol. 27, Issue 3, Pages: 18-23(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.005
        摘要：The experiments were conducted to determine the influences of some factors on the air flow fields and temperature distributions in an air-conditioned room.The results show that the positioning of the air-conditioners influences the cooling rate dominantly and the air discharging angle and speed also have certain effect.In particular,the average indoor temperature decreases faster when the two air conditioners are at opposite ends of the room long side and the air discharges in the horizontal direction.Moreover,the air temperature drops more slowly when the two air conditioners stand corner to corner in the cross.In addition,the temperature field has the minimum temperature difference when cool air issues at an angle of 120 degrees.  
          
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      • Research on Annual Performance Factor of Water-water Heat Pump System

        Vol. 27, Issue 3, Pages: 24-29(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.006
        摘要：The annual performance factor(APF) optimization of water-water heat pump was presented.Based on the building load in a whole year,the APF of a heat pump was defined and used as the optimization function,with the area ratio of heat exchanger as the optimization variable.The optimization mathematical models for the on-off control scheme were set up to calculate the APF to study the optimal design and matching between different components.Comparison with different optimization designs with HSPF,SEER,and EER,the APF optimization is nearer to the reality.  
          
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      • Vol. 27, Issue 3, Pages: 30-34+40(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.007
        摘要：The structure of a laminated evaporator used in automobile air conditioning system was improved.Then the heat transfer and flow characteristics of the laminated evaporator applied in refrigerated cars were compared with those of the fin and tube evaporator using the numerical simulation method.The result shows that the laminated evaporator was more compact and had better heat transfer performance than the fin and tube evaporator under refrigeration conditions.  
          
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      • Experimental Study of Influence of Additives on Ammonia Bubble Absorption

        Vol. 27, Issue 3, Pages: 35-40(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.008
        摘要：To investigate the effects of additives such as 2-EH,1-Octanol,on the ammonia bubble absorption,surface tensions of aqueous ammonia with additives were measured by a drop weight method,and performances of absorption of ammonia vapor from an orifice into water were recorded by a video camera and analyzed.In the case with additives,the surface tension decreased significantly. For a given additive concentration,the surface tension of aqueous ammonia increased with the increase of the ammonia when the concentration was less than 10%. However,the surface tension decreased when the concentration was more than 10%.During the bubble absorption process,the ammonia vapor flow rate had little effect on the bubble generative frequency,however,the maximum bubble volume,the maximum absorption height,and the Sherwood number for a single bubble increased when the flow rate of ammonia vapor increased.For a single absorption cycling,the additives 2-EH and 1-Octanol with a suitable concentration range might enhance the heat and mass transfer.  
          
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      • Vol. 27, Issue 3, Pages: 41-44(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.009
          
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      • Study on Performance Enhancement for Evaporative Condenser

        Vol. 27, Issue 3, Pages: 45-49(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.010
          
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      • Vol. 27, Issue 3, Pages: 50-53(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.011
        摘要：High pressure liquid receiver is a normal component in the refrigeration,air conditioning and heat pump systems,but its effects on the system performance are always neglected.Based on our experiments,the effects of high pressure liquid receiver on the system conditions and performances were discussed at different refrigerant charges.A simple criterion was proposed to judge whether the refrigerant charge is inadequate,appropriate,or excessive.  
          
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      • Vol. 27, Issue 3, Pages: 54-58(2006) DOI: 10.3969/j.issn.0253-4339.2006.03.012
        摘要：The influences of direct current(DC) electric fields on the initial form of the frost crystal on a cold vertical plate were investigated.The photos of frost crystals formed on the plate were taken with different electric field intensities.The results show that at the initial stages of the frost formation,the stronger the electric field,the smaller the water drops formed on the cold plate.After the water drops froze completely,the formed ice columns would grow up gradually.The frost layer thickness on hydrophilic coating was lower than that on copper surface under certain electric-field intensity.The result of this study also shows that electric field leads to the frost mass increase,and the frost mass increases with the increase of the electric field intensity.  
          
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