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Improved Block-Orientated Models for Transient Closed-Loop HVAC Simulations
Published May 20, 2007 by Institution of Mechanical Engineers in United Kingdom
Based on a block-oriented simulation approach for modelling warm-up test of vehicle air conditioning systems - described in a preceding paper - more complex closed-loop sketches are presented, both for air and refrigerant sides, in order to predict performance of HVAC (heating, ventilating and air-conditioning) systems in order to compare results with experimental outcomes.
Although one-dimensional, the model is able to describe different non-stationary behaviors in typical HVAC applications. In particular, as previously shown for warm-up simulation, the paper focuses on cool-down tests, dealing with refrigerant components such as compressor, condenser, TXV (thermostatic expansion valve), evaporator and pipes, and on performance achievable through different configurations.
Comparison between simulations and experimental data are shown for different cases, in order to underline the effects of different components, such as fixed or variable-displacement compressors with parallel or cross-charge TXV, and boundary conditions.