Showing papers by "Ireneusz Zbicinski published in 2016"

A Novel Attempt to Standardize Results of CFD Simulations Basing on Spatial Configuration of Aortic Stent-Grafts.

Abstract: Currently, studies connected with Computational Fluid Dynamic (CFD) techniques focus on assessing hemodynamic of blood flow in vessels in different conditions e.g. after stent-graft’s placement. The paper propose a novel method of standardization of results obtained from calculations of stent-grafts' “pushing forces” (cumulative WSS—Wall Shear Stress), and describes its usefulness in diagnostic process. AngioCT data from 27 patients were used to reconstruct 3D geometries of stent-grafts which next were used to create respective reference cylinders. We made an assumption that both the side surface and the height of a stent-graft and a reference cylinder were equal. The proposed algorithm in conjunction with a stent-graft “pushing forces” on an implant wall, allowed us to determine which spatial configuration of a stent-graft predispose to the higher risk of its migration. For stent-grafts close to cylindrical shape (shape factor φ close to 1) WSS value was about 267Pa, while for stent-grafts different from cylindrical shape (φ close to 2) WSS value was about 635Pa. It was also noticed that deformation in the stent-graft’s bifurcation part impaired blood flow hemodynamic. Concluding the proposed algorithm of standardization proved its usefulness in estimating the WSS values that may be useful in diagnostic process. Angular bends or tortuosity in bifurcations of an aortic implant should be considered in further studies of estimation of the risk of implantation failure.

Environmental, energy and economic aspects in a zero-emission façade system design

Abstract: Purpose The purpose of this paper is to analyze and quantify environmental, energy and economy aspects in a zero-emission facade system design. Design/methodology/approach The efficient design of a zero emission facade system cannot focus solely on the energy performance, but should as well include the economic an environmental aspects in order to make the solution feasible and sustainable in whole life cycle of the facade. In this paper a full environmental impact analysis of six different facade panels was carried out by evaluating the LCA of the panels with MIPS technique. Economic aspects were incorporated into the analysis on the basis of costs of manufacturing, whereas the panels’ energy performance was determined from ESP-r modeling tool. Findings Subsequently, an optimal facade design based on highly isolative panels covered with CIS photovoltaic modules and double skin facade window system was proposed. Systematic and holistic analysis of environmental, energy and economic aspects is crucial for development of optimal zero-emission facade system. Practical implications The proposed solution has been applied in development of an experimental facade built within the framework of German-Polish Energy Efficiency Project. Originality/value The paper provides a multi-objective approach (economy, environment, efficiency) for finding the best solutions for the facade system design. The methodology and the results reported in this research can be used for designing or improving performance of zero-emission facades.