Dynamic modeling and simulation of a centrifugal chiller based on MBSE

Abstract

Product design by a virtual concept has always been a major subject of many of engineers and manufacturers. Issues should be how close to simulate to the real world by virtual ways. Model Based Systems Engineering (MBSE) in a digital modeling environment provides a methodology to make a virtual mock up easily. In the study, 1D/3D co-simulation was performed on a centrifugal cooling system to check how much accuracy was improved. A specific part of the fields which require to be solved in detail was modeled in 3D for co-simulation while the rest of system remained 1D model. The 1D and 3D solvers run at their respective field domains in parallel and share information. The study considered the multi physics for the components of compressor to refrect the effects of interaction between different physics. An electro magnetics, refrigerant flow & fluid dynamics, heat transfers, power electrics be calculated together to simulate them simultaneously. All 3D models converted to meta model to match time scale with 1D model. This paper shows a case study where a virtual design is successfully applied to the centrifugal chiller system, and dynamic behavior of start up at different cooling loads was simulated and investigated. It can be concluded that the approach by co-simulation as a process of MBSE be able to use to the imposed dynamic behavior on the system. The simulation results under a various load conditions showed that it maintained less than 5% compared with experimental data during from start up to the steady state, moreover, co-simulation showed
effective to get a better accuracy.