ralph lauren danmark Under pressure pump CO2 trans

Under pressure pump CO2 transcritical refrigeration system reliability analysis

Ten r = 10mm a 0.01020304.0506.07.08.09010.011.0001.02.03.0405.06.07.08.09.010.011.0P (MPa) P (MPa) (a) (b) Figure 3, the reliability coefficient and the relationship between the medium pressure piping calculations show that in the medium pressure line P = 10 ± 1.0MPa in the conditions, the OD I) 0 = 6 ± 0.6 n the line of hydrazine When the wall thickness = 0.5 ± 0.05,0.75 ± 0.075,1.0 ± 0.1mm, its security objectives were the pressure P: 5.0,7.7,10.1 NPa shown in Figure 3 ~ (a). Other things being equal, the allowable stress of the selected pipe up to [] = 100 ± 10MPa, on the outer diameter I) 0:6 ± 0.6n. 1lll the pipeline,[link widoczny dla zalogowanych], when the wall thickness of only = 0.5 ± 0.05nlIll, the safe pressure Pa to have reached i0. IMPa, shown in Figure 3 a (b). This means that, when the medium pressure line P = 10 ± 1.0MPa and pipe diameter D = 6 ± 0.6mm, just to ensure that the selected pipe wall thickness 6 = 1.0 ± 0.1mm, allowable stress [] = 50 ± 5MPa or wall thickness = 0.5 ± 0.05 allowable stress [] = 100 ± 10MPa, can ensure the reliability of the system piping above the allowable set this article Reliability [R]: 0.99999. Figure 3 as a whole: the allowable stress [] = 100 ± 10MPa for pipe, as long as the wall thickness 6 = 0.5 ± 0.05ram, piping, including P = 10 ± 1.0MPa pressure conditions reliability of operation has exceeded the allowable reliability [R]: 0.99999. At this point, if we increase the wall thickness of pressure in terms of strengthening the system has very little meaning,[link widoczny dla zalogowanych], but will bring some negative effects, such as increased investment in the system, increasing the system thermal stress, affecting the thermal exchange, material toughness down and so on. 4 Conclusion From the above analysis and calculation of the reliability of results can be obtained: (1) When the pipe diameter I) 0, the allowable stress of pipe [] a certain time, the reliability coefficient of a variety of wall thickness pipe with the pipe p are Way suffered the increase of internal pressure, the reliability of the pipeline with the pipeline suffered internal pressure of the increases. (2) The internal pressure generated by the conversion is greater than the impact of stress on the reliability of the internal pressure generated by the axial stress on the reliability of that pipeline under internal pressure, just to satisfy ( Cool

, to a certain to satisfy (9). Therefore, after the trans-critical cycle of co2 system reliability analysis and calculation, just to satisfy ( Cool

as a precondition to carry out can be. A 57 a ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ 50 Pak {;; 2f; ∞ safety pressure P projects selected mainly by the wall thickness and material allowable stress [o] constraints. Increase in wall thickness of 6,[link widoczny dla zalogowanych], or increase the allowable stress of selected material [o], or both increased, can guarantee the safety pressure pipe system running under Ps. But if the wall thickness to increase pressure in terms of strengthening the system has very little meaning, but will bring some negative effects, such as increased investment in the system],[link widoczny dla zalogowanych], increasing the system thermal stress], affect the system's heat exchanger, material toughness down and so on. (4) is not a high operating pressure trans-critical cycle C can not solve the problem. References 1 Sun Fengzhong. Heat exchanger reliability and failure analysis introduction. Beijing: China Standard Press, a s8 one accurate, 1998.2 Wu Yue Qian. Boiler and Pressure Vessel Safety Engineering. LIU Qing-Fang. Beijing: Beijing Economic College Press, 19913 Fan Chin Shan. Pressure analysis of pressure vessels and strength design. Beijing: Atomic Energy Press, 1983.4 Wu Shiwei. Structural reliability analysis. Beijing: China Communications Press, 1985.5 Sang light. Structural reliability theory and its application. San pad. Shanghai: Shanghai Jiaotong University Press, 1986.6 wear trees and. Reliability engineering and its application in chemical equipment. Wang Minge. Beijing: Chemical Industry Press,[link widoczny dla zalogowanych], 1987.7 Qin Xiao Zhong. World pressure vessel steel manual. Rattan Matilda. Beijing: Mechanical Industry Press, 1996.8 Wang Kan Wang. c02 transcritical cycle of theoretical analysis and experimental study: [Ph.D. Thesis]. Tianjin: Tianjin University, 2000

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