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Off-design performances of heat pump system using HFC125/HC290 binary blends
Author(s): F. Wang, X.W. Fan, Z.W. Lian, X.P. Zhang, L. Zhang, Z.Y. Guo
Source: 6th International Conference on Energy and Environment of Residential Buildings (ICEERB 2014), 2014, p. 31 (5 .) - 31 (5 .)
Type: ConferencePaper
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The off-design experimental performances of heat pump system using HFC125/HF290 (25/75, mass fraction) binary blends are investigated by varying the mass flowrate of heat sink. The influences of heat sink flowrate upon system coefficient of performance (COP), discharge temperature, exergy efficiency, volumetric heating capacity, mean heat transfer coefficient and temperature profile in condenser are analyzed. The results show that the compressor power and compression ratio is increased with the mass flowrate of heat sink while the volumetric and specific mass heating capacity is increased firstly and then decreased. Meanwhile, the discharge temperature is decreased and the mean heat transfer coefficient is increased when the mass flowrate of heat sink is raised. For second heat transfer fluid temperature difference in condenser, it is gradually dropped at the inlet of the condenser and increased in the middle of the condenser and at the outlet of the condenser. Under the condition of heat sink outlet temperature of 35 °C, the heat transfer pinch point is transferred into the inlet of the condenser. The results in this research can be a useful guideline for the application of heat pump system using such kinds of refrigerant blends.

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Vehicle body structural parameter optimization based on dynamics simulation
Author(s): Shungang Hua, Zhihao Zhu, L. Zhang
Source: International Conference on Advanced Technology of Design and Manufacture (ATDM 2010), 2010, p. 51 - 55
Type: ConferencePaper
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A mixed rigid-flexible virtual prototype of a certain vehicle is constructed by body finite element model and geometry models of vehicle components. Based on multi-body dynamics simulation of the vehicle prototype under several typical driving conditions, the total loads acting on the vehicle body at the moment when the body stress is maximal are exported and imposed on the body finite element model. After static analysis and sensitivity analysis, structural size parameter optimization of the body are carried out, then we adjust size parameters of the body by optimization results. Dynamics simulation is executed again with reconstructed virtual prototype, and we can compare the stress and deformation of the body with the former. Experimental results show that the total weight of the vehicle body is reduced by 14.4% subject to strength requirements and our scheme is effective for vehicle structural parameter optimization.

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