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Hydrocarbon refrigerants Fast Calculation of thermodynamic properties

Thermodynamic properties of the system carry the pursuit of accurate calculation agent is unable to improve the overall effectiveness of the system simulation. Therefore, we must consider the compromise between accuracy and speed. (2) the principle of reversibility in simplified form the Cieland most prominent advantage of making between vapor pressure and saturation temperature calculated is reversible. This is very important for the system dynamic simulation. Dynamic simulation in the system at some point in order to determine the state of the system, often an election on behalf of the calculations, if calculated by the state of thermal properties between the parameters can not be completely reversible, then bound to affect the robustness of simulation software. To meet the dynamic simulation modeling and programming with better flexibility, the system should be gradually 1Ij carry simplified calculation of thermodynamic properties do more reversible form. (3) the principle of continuity and smoothness Sometimes, in order to find a simple form for a wide range of high precision and rapid calculation of the unification. Continuity and smooth and reversible, like the robustness of simulation software will have a serious impact. The published literature from the current point of view,[link widoczny dla zalogowanych], this problem has not been taken seriously. In view of the proposed homes in the manufacturing sub-agents carry simplify the calculation of thermodynamic properties of the superiority needs to be further research in this area. 4 Conclusion This paper proposed by Cleland simplify the calculation of refrigerant thermodynamic properties of R600a and R290 are given the form of quasi-rounded results, and the precision and considerable other refrigerants. Meanwhile, the paper discusses the dynamic simulation system for manufacturing the system carry carry simplified calculation of thermodynamic properties agents should follow some basic principles, which for a number of changes in the blind fitting, standardized system of simplified calculation of thermodynamic properties of positive significance. 'BIBLIOGRAP 1Clel ~ ndAC. Computersubroutinesforrapidevaluationofrefrigerantthermodynamicprop-erli ~. Int. J. Refrlg. . 1986; (4) {346 ~ 3512ClelandAC. Polynomialcu Ⅳ e-fitforrefr a erantthermodynamicproperties} extensiontoincludeR134a. 1nt. J. Refring. -1994; (4)} 245 ~ 2493YoungloveBA. ElyJFThermophysicalprop-ertsoffluids. Ⅱ. Methane. Ethane. Propene ・ lsobutand. andnormalButane. J. Phys. Chem. Ref. Data. 1987; (4) {577 ~ 583} 685 ~ 715; 722 ~ 7574DowningRC. Refrigerantequations. ASHRAETrans. , 1974l (2)% 158 ~ 169 Chun Road, 200030 Shanghai Jiao Tong University Institute of Power and Park, according to the third International Conference on pumps and fans Call for Papers by the State Education Commission,[link widoczny dla zalogowanych], Tsinghua University hosted the third international academic pumps and fans meeting (English name THETHIRDINTERNATIoN-ALCoNFERENCEONPUMPSANDFANS Forest, said: 3rdICPF). Will be held October 13, 1998 to 16 in essence held at the University. Conference Call for Papers include pumps. Fan. Blower. Compressor - injection. Seal the neglect door - machinery and other liquid components and systems Xing within a pit, including: design and analysis, theory and principles + engineering applications. Study. Numerical analysis. Calculation of Turbulent fluid cavitation and multiphase flow, wear and abrasion + finals and the rotor dynamics analysis. Noise and vibration + shocks and unsteady flow, performance and operation - System and Control Pina and so on. Call for Papers on the following dates February 30,[link widoczny dla zalogowanych], 1998} to submit papers in English Ren issued March 30,[link widoczny dla zalogowanych], 1998 sending offer; June 1, 1998 to submit papers printed in English and the paper issued on 9 Indian Council Wei Fei 300. August 1, 1998 to submit the registry. The registration fee l ・ 000 元 meetings and papers of the Academic Committee of the registration fee of 500 yuan. Registration date of the meeting 12 April 1998, lO. University of the essence of a place. Contact: Seika University,[link widoczny dla zalogowanych], Department of Water and Yulin; Zip i100084; phone i010 - 62782187-62782251; Fax :010 - 62785699a Tsinghua ring pumps and fans of literature of the third box set Organizing Committee of Academic

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