最新刊期
卷 31 ， 期 1 ， 2010
- 摘要：Phase-out of R22 will start in China but the existing alternatives to R22 are unsuitable in some application.On the basis of the present status and requirements for new environment-friendly alternatives,we proposed using R32 to replace R22 in household/commercial air conditioning in 2009.In this paper,the analyses on some issues for R32 to replace R22 are performed including evaluation of the effect on carbon dioxide emissions,the maximum charge limitation in a unit,the energy saving,the feasibility for the...1819|405|29更新时间：2025-09-03
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- 摘要：When an air source heat pump water heater runs at higher water temperature,the power input and the discharge temperature of its compressor are high,leading to problems of security and stability,and the significant decrease of the system efficiency.In our study,a hot water system with a two-stage condensation heat pump and its corresponding control method were proposed.The experimental results show that compared with the conventional heat pump water heaters,the present system can raise the temperature of sup...1641|407|9更新时间：2025-09-03
- 摘要：The characteristics of an evaporator using R404A with liquid refrigerant supply by gravity were investigated at lower temperature.A heat transfer model of an evaporator with liquid refrigerant supply by gravity was established.The experiment was conducted using the thermal balance method to obtain the operation characteristics of an evaporator with liquid refrigerant supply by gravity in different supply height.The results indicate that the logarithmic temperature difference between the evaporator and the i...1720|394|5更新时间：2025-09-03
- 摘要：The statistics on the total heat of outdoor air are conducted with the Enthalpy Frequency Method.On the basis of the feasibility of the Enthalpy Frequency Method in the investigation into energy-saving potential for total heat recovery,some important parameters are applied to evaluate energy-saving potential for total heat recovery,such as the critical enthalpy value of outdoor air,the net recovery energy,the operating ratio of the heat exchanger,the energy-saving rate of heat recovery.The Enthalpy Frequenc...1557|363|1更新时间：2025-09-03
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- 摘要：Al2O3-H2O nanofluids with uniform dispersancy were prepared in which a spot of Al2O3 nanoparticles with a particle size of 20nm suspended in water and the dispersant and supersonic oscillating were added.The cold storage characteristics of the nanofluids and water were experimentally compared.The results show that the nanoparticles in water reduced the subcooling degree of water and the freezing time,and the cold storage capacity of the nanofluids was larger than that of water for the same time.1686|382|14更新时间：2025-09-03
- 摘要：A new refrigerant mixture,R1270/R152a/R13I1,is proposed as a substitute for R22 in this paper.The thermophysical properties of this environment-friendly mixture and its refrigeration system performance are theoretically analyzed with the software Refprop 8.0.The results show that the COP and the unit volume refrigerating capacity of the system with the new refrigerant mixture is equivalent to those with R22 under the standard working condition.Under the variable working condition,the temperature glide of th...1882|361|5更新时间：2025-09-03
- 摘要：From the Danckwerts theoretical surface renewal model of mass transfer,an approach using nanoparticles to enhance ammonia bubble absorption process was examined in this study.In our experiment,the ammonia vapor flow flux and the concentration ratio of bulk ammonia solution were adjusted and their effects on ammonia bubble absorption were explored.The experimental results show that the absorption ratio was significantly increased by adding Al2O3 nanoparticles in the bulk solution,and the effective absorption...1634|378|9更新时间：2025-09-03
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- 摘要：The two-phase simulation models for a plate heat exchanger with R410A are established,and the error analysis and the comparison for the models are performed using the experimental data.Moreover,the factors to influence the performance of the heat exchanger are discussed.The average error of the modified model of condensation heat transfer is less than 5%.The accuracy of the modified model of evaporation heat transfer based on Yan and Lin increases by 10% compared with those in literature and its average err...1789|405|4更新时间：2025-09-03
- 摘要：An experimental investigation was conducted on the performance of a crossflow plate type heat exchanger used as an indirect evaporative cooler.It is found that both the air mass flow rate and the ratio of the mass flow rate have a significant effect on the heat exchanger performance.The clear difference in performance is found for dry and wet conditions due to the great change in the ratio of the heat capacity rate of the two fluids.The experimental results show that the actual friction factor was greater t...1690|395|3更新时间：2025-09-03
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