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Two-phase fluid network model for steady-state and dynamic simulation of multi-unit air conditioners.
Number: pap. ID: 425
Author(s) : SHAO S. Q., XU H. B., TIAN C. Q.
Summary
An integrated simulation model was developed to investigate the steady-state and dynamic performance of multi-unit air conditions (MUACs). It is built with the framework of two-phase fluid network which is able to describe different systems by incidence matrixes. And the submodels are embedded in the system framework, where the submodels can be either steady-state or dynamic model, distributed parameter or lumped parameter model. For this case, the numerical submmodels are employed such as moving-boundary condenser and evaporator models, steady-state models of compressor and electronic expansion valve. The model was validated by the data of a MUAC with four indoor units, which showed that the model can predict not only the steady-state performance, but also catch the dynamic trends of the MUAC with high accuracy, for example, the differences of evaporating pressure <±4%, condensing pressure <±3%, compressor discharge temperature <±4°C, superheating degree <±2°C, and subcooling degree <±1°C. Therefore, it was confirmed that the proposed simulation model is an effective tool to analyze the steady and transient characteristics and optimize system design and the control algorithm of MUACs.
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Details
- Original title: Two-phase fluid network model for steady-state and dynamic simulation of multi-unit air conditioners.
- Record ID : 30002996
- Languages: English
- Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
- Publication date: 2011/08/21
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