In this paper a working principle based upon the novel expansion and distributor device EcoFlowTM is analyzed.The device enables compensation of flow maldistribution by control of individual channel superheat.The working principle is discontinuous liquid injection (pulsating flow) into each individual channels during aspecified cycle time. Moreover, the influence of the injection cycle time is investigated together with an optionalsecondary flow into the other channels with regards to cooling capacity, overall UA-value and COP.The results showed spurious fluctuations in pressure when simulating the pulsating flow, thus the dynamicbehavior in the mixture two-phase flow model is insufficient to model the discontinuous liquid injectionprinciple. Despite, the fluctuations and imperfections of the model we found that the cycle time should bekept as low as possible and that the optional secondary flow increases performance. Moreover, the paper reportson the applicability of Modelica developed models to analyze and optimize the working principle anddesign of expansion devices such that Modelica may be used in future development of novel discontinuousexpansion devices.
展开▼
