Browsing by Author "Smierciew Kamil"
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- ItemDesign of vapour ejector for refrigeration system based on CFD simulation.(2017) Dvořák Václav; Smierciew Kamil; Butrymowicz Dariusz; Gagan JerzyRenewable energy sources may be applied to drive refrigeration and air-conditioning systems, e.g. solar radiation, geothermal resources, heat derived from biomass combustion or waste heat rejected form various thermal processes. In this case absorption systems or ejection refrigeration systems may be used for cooling applications. The paper deals with numerical simulation applied for design of the ejector. Designed ejector is dedicated to the low-temperature driven ejection refrigeration system operating for district cooling system. Temperature and capacity of the motive heat are fixed. The 0D model was used for estimation of the ejector design and CFD simulations were used for validation and modification of the geometry of the ejector. Analysis were performed for the case of isobutane.
- ItemExperimental and Numerical Study on Supersonic Ejectors Working with R-1234ze(E)(EDP Sciences, 2018) Kracík Jan; Dvořák Václav; Nguyen Van Vu; Smierciew KamilThese days, much effort is being put into lowering the consumption of electric energy and involving renewable energy sources. Many engineers and designers are trying to develop environment-friendly technologies worldwide. It is related to incorporating appropriate devices into such technologies. The object of this paper is to investigate these devices in connection with refrigeration systems. Ejectors can be considered such as these devices. The primary interest of this paper is to investigate the suitability of a numerical model for an ejector, which is incorporated into a refrigeration system. In the present paper, there have been investigated seven different test runs of working of the ejector with a working fluid R-1234ze(E). Some of the investigated cases seem to have a good agreement and there are no significant discrepancies between them, however, there are also cases that do not correspond to the experimental data at all. The ejector has been investigated in both on-design and off-design working modes. A comparison between the experimental and numerical data (CFD) performed by Ansys Fluent software is presented and discussed for both an ideal and a real gas model. In addition, an enhanced analytical model has been introduced for all runs of the ejector.