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International Journal of Refrigeration 2009第7期发表博士生赵丹和彭浩为第一作者的二篇研究论文
2009-09-14
这二篇论文的题目与摘要如下：
[1] Dan Zhao, Guoliang Ding, Zhigang Wu. Extension of the implicit curve-fitting method for fast calculation of thermodynamic properties of refrigerants in supercritical region. International Journal of Refrigeration, 2009, 32 (7): 1615 – 1625
ABSTRACT：The implicit curve-fitting method has been used for fast and stable calculations of thermodynamic properties of subcritical refrigerants, and it has to use the saturated liquid or vapor state as the reference state. In order to extend the application range of this method in supercritical region, an isothermal state in the supercritical region is used as the reference state, and the implicit equations for supercritical refrigerants in this state and out of this state are established, respectively. The new calculation method can be used in the entire supercritical region. With the new method, thermodynamic properties of supercritical CO2 and R410A are predicted and compared with REFPROP 8. It shows that the total mean relative deviations of the fast calculation formulae from REFPROP 8 are less than 1%, while the mean calculation speeds of the fast calculation formulae are more than 100 times faster than those of REFPROP 8.
Keywords: Refrigerant, Transcritical cycle, Calculation, Thermodynamic property, Carbon dioxide, R410A
[2] Hao Peng, Guoliang Ding, Weiting Jiang, Haitao Hu, Yifeng Gao. Measurement and correlation of frictional pressure drop of refrigerant-based nanofluid flow boiling inside a horizontal smooth tube. International Journal of Refrigeration, 2009, 32 (7): 1756 – 1764
ABSTRACT：The objective of this paper is to investigate the effect of nanoparticle on the frictional pressure drop characteristics of refrigerant-based nanofluid flow boiling inside a horizontal smooth tube, and to present a correlation for predicting the frictional pressure drop of refrigerant-based nanofluid. R113 refrigerant and CuO nanoparticle were used for preparing refrigerant-based nanofluid. Experimental conditions include mass fluxes from 100 to 200 kgm-2s-1, heat fluxes from 3.08 to 6.16 kWm-2, inlet vapor qualities from 0.2 to 0.7, and mass fractions of nanoparticles from 0 to 0.5 wt %. The experimental results show that the frictional pressured drop of refrigerant-based nanofluid increases with the increase of the mass fraction of nanoparticles, and the maximum enhancement of frictional pressure drop is 20.8% under above conditions. A frictional pressure drop correlation for refrigerant-based nanofluid is proposed, and the predictions agree with 92% of the experimental data within the deviation of ±15%.
Keywords: Heat exchanger, Smooth tube, Horizontal tube, Experiment, Measurement, Coefficient, Friction, Flow, Boiling, Refrigerant, Additive, Particle