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In this paper, a hybrid modeling approach is proposed to describe the dynamic behavior of the two phase flow condensers used in air-conditioning and refrigeration systems. The model is formulated based on fundamental energy and mass balance governing equations, and thermodynamic principles, while some constants and less important variables that change very little during normal operation, such as cross-sectional...
Hybrid model is a simple and accurate model for stable heat transfer process. Its theoretical basis shows that it is inappropriate to be applied to system with severe coefficient drifting. However, coefficient drifting is normal phenomenon in power and chemical industrial due to fouling. In this paper, a modified hybrid model of heat exchanger is proposed. The derivation of system is based on heat...
This paper proposes a hybrid compressor model for the purpose control and optimization of vapor compression systems. Unlike those existing models, this model is determined by only the inlet and outlet conditions of compressor without requiring detailed geometric specifications, and only the variables responsible to the system performance, which can be measured and controlled, are selected as the input/output...
A dynamic simulation model of vapor compression cycles is built using the lumped parameter, moving boundary approach. A linearized version of the model suitable for dynamic analysis and controller design is proposed using a Taylor series expansion method, where 2nd order and higher order terms are omitted. Analysis indicates that the linearized model indicates that the system exhibits multiple time-scale...
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