Constructive Design Elements of Large Dimensions Cyclones
Authors: Radu I. IATAN, Melania (MITUCĂ) CORLECIUC, Gheorghiţa TOMESCU, Anca Mădălina DUMITRESCU, Luminiţa Georgiana ENĂCHESCU, Gheorghe-Cosmin CIOCOIU
The article addresses the issues specific to the constructive design of large cyclones, with tangential supply of the dust impurified gas. In this sense, the expressions for the stresses developed in the separation sections of the vortex finder tube and the flat sheet are established. The radial size of the plate, fixed also to … (read more)
Modeling and Simulating the Operation of the Pneumatic Cylinders
Author: Anca BUCUREȘTEANU
This paper presents the simulation and mathematical models necessary for studying the behavior of the pneumatic cylinders in static and dynamic conditions. The mathematical models are simplified, accessible and adaptable to different applications; they can be used in the design phases of new pneumatic units in the industrial fields. The models for cylinders with or without braking at travel end are presented.
Depending on each system, these models can be supplemented with models of equipment for regulation and distribution, in order to … (read more)
Considerations regarding the Recovery and Utilization of Residual Heat from Data Centers
Authors: Adriana TOKAR, Daniel MUNTEAN, Dănuț TOKAR, Daniel BISORCA, Mihai CINCA
In the context of the acceleration of the need to store and process data and digital telecommunications, which leads to an increase in global electricity consumption and greenhouse gas emissions, the need for research to find reliable, efficient, and cost-effective solutions to reduce energy consumption and the recovery of the residual heat produced by the data centres is an increasingly urgent one. The article presents aspects that refer to the recovery of residual energy from data centres and its use for the preparation of domestic hot water, but also for … (read more)
Density and Viscosity Effects of Hydraulic System Working Fluid
Author: Fănel ȘCHEAUA
Fluid actuation systems have proven their efficiency over time to ensure the solution of the most difficult tasks in most industries. Today we are witnessing the implementation of these systems on most of the machines and equipment that make up the stationary and mobile industry. This development is highlighted by the well-designed construction of the components, which have been modernized over time, thus enabling actuation solutions for … (read more)
New Drought Index Implementation at Station 15130, Valle de Bravo, Mexico
Authors: Maritza ARGANIS, Margarita PRECIADO, Faustino DE LUNA
This research focused on meteorological drought problem a phenomenon that has affected several countries and has had significant impacts on various water uses, including human, agricultural, and industrial consumption. To address this problem, the NDI index was applied, which uses precipitation and mean air temperature data, and the RASP method to the annual data of the Presa Valle de Bravo weather station, in Edomex., Mexico. This analysis allowed the identification of … (read more)
High-Performance Techniques and Technologies for Monitoring and Controlling Environmental Factors
Authors: Marius-Valentin DUMITRESCU, Ionuț VOICU, Aurelia-Florentina VASILICA, Mariana PANAITESCU, Fănel-Viorel PANAITESCU
The impact of air quality inside residential buildings and constructions on the health of residents and workers has been studied very little in recent years. In the school environment, students are constantly exposed to mixtures of airborne substances from a wide variety of sources both in classrooms and in the school environment. Exposure to such factors of students influences, in the long term, physiological development, dynamics, quality of life, life expectancy, without being aware of the dangers in the air and being able to make decisions on reducing exposure to the risk factor. In the short term, poor air quality in classrooms leads to a decrease in attention and concentration, both for the student and the teaching staff. The research is motivated by … (read more)
Insights on Hydroponic Systems: Understanding Consumer Attitudes in the Cultivation of Hydroponically Grown Fruits and Vegetables
Author: Ștefan ŢĂLU
This study examines consumer attitudes toward fruits and vegetable cultivation in hydroponic systems, shedding light on how consumers perceive and interact with this innovative agricultural approach. Socio-demographic factors, such as gender, age, and education level, emerged as significant influencers on the frequency of consuming fruits and vegetables grown hydroponically. The frequency of consuming hydroponically grown fruits and vegetables is notably shaped by consumers’ knowledge regarding the quality and safety of produce from this farming method. Furthermore, this analysis reveals … (read more)
Hydraulic Power Generation Unit Powered by Photovoltaic Energy
Authors: Radu RĂDOI, Bogdan TUDOR, Ștefan ȘEFU, Robert BLEJAN
The conversion of solar energy into electricity can provide a solution to the following problems: access to electricity for users or applications in areas without access to the electricity grid and hybrid system operation of some equipment in order to reduce pollution due to conventional energy sources (internal combustion engines, mainly). In both cases, if hydraulic power is required at the end user (irrigation systems, waste compaction, lifting installations, various drive systems), this is obtained with the help of … (read more)
Assessing Flood Severity and Risk to Residents in Bosque Chapultepec
Authors: Itai NAVA-ROMERO, José Avidán BRAVO-JÁCOME, Margarita Elizabeth PRECIADO-JIMÉNEZ
This paper aims to study storm events that lead to urban flooding and their after-effects in Bosque Chapultepec, an urban forest located in Mexico City. Considering Bosque Chapultepec’s landscape configuration and composition, along with micro-watersheds that drain into the four-sectioned study area, the water depths and velocities were estimated through hydrodynamic models in Iber derived from … (read more)
Simulation Study of a Double-Acting Hydraulic Cylinder with Shock Absorber
Authors: Tiberiu AXINTE, Lidia CALANCEA, Elena CURCA, Mihai DIACONU, Camelia PASCU
This paper focuses on the efficiency of the double-acting hydraulic cylinders with shock absorber at stroke end. In the present work, the simulation of two hydraulic circuits and an electro-hydraulic circuit with double-acting cylinders with shock absorber is studied. Thus, the first hydraulic circuit is made of the following components: tank, throttle check valve, 4/2-way hand lever valve with spring, filter, fixed displacement pump, and double-acting cylinder with shock absorber at … (read more)
PWM Drive Method Considerations for Proportional Pneumo-Hydraulic Solenoid Valves
Authors: Robert BLEJAN, Marian BLEJAN, Alexandru IONESCU
The evolution of programmable controllers, PLCs, has allowed the digital approach to hydraulic and pneumatic applications made with proportional devices. Thus, the presence of built-in PWM (Pulse Width Modulation) blocks in most PLCs allows the direct control of the valve coils, using a simple electrical circuit to adapt the digital output of the PLC to the solenoid of the proportional device. This paper presents the calculus of the parameters for PWM drive according to … (read more)
Environmental Risk Assessment and Analysis for Nuntaşi Hydrographic Basin
Authors: Mariana PANAITESCU, Fănel-Viorel PANAITESCU, Ionuț VOICU, Aurelia-Florentina VASILICA
The way of approaching the flood hazard in the Dobrogea Hydrographic Area consists in a first phase in the grouping of registered water courses on three levels of detail according to the frequency of floods in recent years, their amplitude, the form of manifestation, the degree of equipping with works of defence against floods, social or economic objectives subject to flood hazard. The causes of these floods were the amounts of precipitation from torrential rains recorded in a certain period of time. Due to the flood waves, the danger levels were exceeded, some sectors of … (read more)
