This paper is the part 2 of a two-part series. It deals with the electrical and thermal energy savings, in Smith & Wesson's 153-year-old plant located in Massachussets.Thanks to the design and the installation of the new electrical system, the electrical-power demand has been reduced by 72.5 %, the annual electrical-energy consumption by 54.6 % and the annual thermal-energy consumption by 34.6 %. For that the nine electrical motors serving the make-up air units and exhaust fans have been equipped with VFD (variable-frequency-drive).
A comprehensive energy-conservation study that leads to design and installation of ventilation system that improves plating process operating energy efficiency at the plant. The plating area contains 40 process tanks that require an organized removal of contaminants. The plating process requires maintenance of adequate ventilation. Thanks to the installation of an optimally balanced variable volume ventilation, the plating and associated process areas experienced a considerable reduction in ventilation air changes by 27.3 %.
This article deals with the most critical issues and outstanding solutions in the Indoor Air Quality field. The sources of IAQ problems such as indoor pollutants, as well as the resolutions (ventilation standards, control technologies, air quality and green buildings, homeland security) are presented. But more research and development is still needed though progress toward indoor environments that reliably control odors and chemical or biological contaminants to safe and comfortable levels is being made.
In the aircraft cabin environment, the major air pollution source inside the cabin is human bioeffluents. The performance of PCO (photocatalytic oxidation) air cleaners for this group of pollutants at low humidity is not well documented. The aim of that study was to examine the performance of two prototype PCO air purifiers from different manufacturers in a simulated aircraft cabin environment with real human bioeffluents as the main pollution source.
The fibers in the electret filter are permanently charged, so electrostatic forces act between the charged fibers and the aerosol. The aerosol capture mechanisms of these filters depend on a combination of the electrostatic mechanisms (dielectrophoretic and Coulombic) as well as the conventional mechanisms, including impaction, interception, diffusion and gravitationally settling.
Though many researches have investigated the filtration characteristics of the electret filters, few studies have demonstrated the comparison of influences of different parameters on the aerosol
That laboratory study was conducted to investigate the co-sorption effect of a dessicant rotor as an air-cleaning device and to show its practical value on improving perceived air quality. The air cleaning effect appears independent of air humidity. The observed air-cleaning effect of a dessicant rotor can also decrease energy consumption of HVAC systems that use desiccant cooling.
In this paper, the authors comment on the testing process of portable air cleaners whose test protocol is based on the measured decay rate of contaminant concentrations with the air cleaner operating compared with the measured decay rate when the air cleaner is turned off. The resulting metric, the clean air delivery rate (CADR) allows an intercomparison of performance among various air cleaners along with a comparison of air cleaner operation to other contaminant removal processes.
The performance of an air cleaner depends on the outdoor air change in the space where it serves. The results of that study reveal that when the outdoor air change rate of that space approaches the clean air delivery rate of an air cleaner, the efficiency of the air cleaner declines. Inversely, as the clean air delivery rate of an air cleaner exceeds the outdoor air change rate of the space it serves for by more than four times, the air change of that space has practically no effect on the air cleaners performance.
The objective of the present paper was to investigate the ability of activated carbon filters to protect office workers from the contaminants originally emitted outdoors. Models combining advection, sorption and diffusion in a porous medium were implemented in the Matlab/Simulink environment to simulate the dynamic behaviour of an integrated building/HVAC with activated-carbon filter system.
The overall performance of an air purifier in removing toal volatile organic compournds (TVOC) is presented in this paper. The air purifier has been connected with the air distribution system above the ceiling of the waiting area of the optometry clinic in Hong Kong polytechnic university.
The comparison between chamber test and field measurement indicates the effect of room ventilation on the effectiveness of air purifiers.
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