Search results for "Ventilation"
showing 6 items of 476 documents
Surrogate-assisted evolutionary multiobjective shape optimization of an air intake ventilation system
2017
We tackle three different challenges in solving a real-world industrial problem: formulating the optimization problem, connecting different simulation tools and dealing with computationally expensive objective functions. The problem to be optimized is an air intake ventilation system of a tractor and consists of three computationally expensive objective functions. We describe the modeling of the system and its numerical evaluation with a commercial software. To obtain solutions in few function evaluations, a recently proposed surrogate-assisted evolutionary algorithm K-RVEA is applied. The diameters of four different outlets of the ventilation system are considered as decision variables. Fr…
Bilevel heat exchanger network synthesis with an interactive multi-objective optimization method
2012
Abstract Heat exchanger network synthesis (HENS) has been an active research area for more than 40 years because well-designed heat exchanger networks enable heat recovery in process industries in an energy- and cost-efficient manner. Due to ever increasing global competition and need to decrease the harmful effects done on the environment, there still is a continuous need to improve the heat exchanger networks and their synthesizing methods. In this work we present a HENS method that combines an interactive multi-objective optimization method with a simultaneous bilevel HENS method, where the bilevel part of the method is based on grouping of process streams and building aggregate streams …
The transformation of a building of the 1970s into a contemporary sustainable building in the Mediterranean Basin
2008
The paper shows the design strategies adopted by a group of graduands of the Faculty of Building Engineering at the University of Palermo involved in a research project aimed to analyse the problems related to the renovation of modern buildings and to solve them by using sustainable approach. In particular, the aim of the research is to investigate these problems in the context of the Mediterranean Basin by adopting, when possible, design criteria inherited by the traditional architecture where sustainable design strategies were used unconsciously. The graduands thesis consists in the transformation of Mazara City Hall into the new "Satiro Danzante Museum" by using natural ventilation syste…
Advances in ventilatory treatment for OSAS
2021
Continuous positive airway pressure (CPAP) is the most widely used treatment for obstructive sleep apnea (OSA), and was established four decades ago. An alternative option is to use bilevel ventilation, in order to improve compliance to treatment especially in patients who need a high therapeutic pressure to prevent nocturnal respiratory events. Automatic CPAP or bilevel ventilation are also established among OSA therapeutic choices, and are generally indicated in cases of highly variable therapeutic pressure. The major advances in the field regard OSAS in the context of uncomplicated obesity hypoventilation syndrome (OHS), in which either CPAP or bilevel ventilation yield comparable result…
Ventilation Problems in Heritage Buildings
2007
The control of indoor conditions in heritage buildings, such as castles or museums, is of paramount importance for the proper preservation of the artworks kept in. As heritage buildings are often not equipped with HVAC systems, it is necessary to provide proper interventions and measures with the aim of monitoring and controlling indoor physical parameters. Moreover, another requirement should be achieved in such buildings, that is the maintenance of the safety conditions in presence of visiting people. This work reports the results of a survey carried on a hall of a historical palace, aimed to assess an useful correlation between CO2 concentration and occupancy levels.
Skuteczność wentylacji grawitacyjnej w budownictwie mieszkaniowym
2013
Skuteczność systemu wentylacji jest znaczącym problemem w budownictwie mieszkaniowym.W pracy przedstawiono wyniki badań systemu wentylacji grawitacyjnej w lokalach mieszkalnych poddanych termomodernizacji. Badania przeprowadzono w lokalu mieszkalnym o powierzchni 60 m2 znajdującym się w budynku wielorodzinnym w Opolu. Badania prowadzono zarówno przed jak i po prowadzonej termomodernizacji mieszkania. Badania wykazały iż wentylacja grawitacyjna nie spełnia wymaganych w normach parametrów wymiany powietrza. Stwierdzono również zmniejszenie skuteczności wentylacji grawitacyjnej po przeprowadzeniu prac termomodernizacyjnych.