new exhaust ventilation system design software

A Microsoft Windows based ventilation software package is developed to reduce time-consuming and boring procedure of exhaust ventilation system design. This program Assure accurate and reliable air pollution control related calculations. Herein, package is tentatively named Exhaust Ventilation Design Software which is developed in VB6 programming environment. Most important features of Exhaust Ventilation Design Software that are ignored in formerly developed packages are Collector design and fan dimension data calculations. Automatic system balance is another feature of this package. Exhaust Ventilation Design Software algorithm for design is based on two methods: Balance by design [Static pressure balance] and design by Blast gate. The most important section of software is a spreadsheet that is designed based on American Conference of Governmental Industrial Hygienists calculation sheets. Exhaust Ventilation Design Software is developed so that engineers familiar with American Conference of Governmental Industrial Hygienists datasheet can easily employ it for ventilation systems design. Other sections include Collector design section [settling chamber, cyclone, and packed tower], fan geometry and dimension data section, a unit converter section [that helps engineers to deal with units], a hood design section and a Persian HTML help. Psychometric correction is also considered in Exhaust Ventilation Design Software. In Exhaust Ventilation Design Software design process, efforts are focused on improving GUI [graphical user interface] and use of programming standards in software design. Reliability of software has been evaluated and results show acceptable accuracy

Synthesis, activity and thermal stability of gold nanoparticle on modified NH[4]-Y type zeolite for cooxidation

Gold nanoparticle is the active catalyst for CO oxidation at low temperature. This feature of gold base catalysts is suitable to overcome the problem of cold-start problem of automobile exhaust TWC converters. In this study gold nanoparticle were deposited on modified NH[4]-Y type zeolite. The activity of synthesized catalyst was measured in a fixed-bed quartz-tubular reactor [7mm i.d.] under atmospheric pressure. In order to investigate the catalytic activities toward CO oxidation reaction, 31mL/min of air and 0.155mL/min of carbon monoxide were mixed and then passed through the reactor. It was found that activity of Au/Y catalyst was 100% at 20°C. The thermal stability of Au/Y catalyst was measured at 400°C for 4h. The activity of the catalyst was decreased to 65% at 20°C after thermal stability test. Results of Energy Dispersive Analysis by X-rays before and after thermal stability have showed that Au content of these samples were 3.89% and 1.76, respectively. It was found that the amount of Au content decreased after thermal stability process. Fourier Transform Infrared [FT-IR] spectra showed no changes in framework structure of zeolite during thermal stabilization process of the catalyst