Abstract
Adequate ventilation is important because it protects both our health and home. However, the ventilation and energy requirements necessary to achieve good indoor air quality (IAQ) may interfere with one another. This paper presents the energy-saving potential of a ventilation system with an air-cleaning unit and demand control in a multi-residential building. This strategy is based on the demand to save energy in ventilation by reducing the supply of outdoor air using air cleaning while maintaining the desired air quality. Hence, the operation mode of the ventilation system in this study senses the indoor CO2 and HCHO concentrations according to the IAQ code for homes in Korea. The ventilation and air-cleaning modes are then operated independently or simultaneously to optimize the energy usage for ventilation.The simulation results indicate that, in maintaining the required IAQ level, the proposed ventilation system reduces the operation rate of the induction of outdoor air for slightly less than 50% of the operating time and decreases the energy use by approximately 20% with its air-cleaning and demand control mode compared to the conventional systems that employ a continuous ventilation mode.
Highlights
Coal can be defined as combustible sedimentary rock, consisting of at least 50% of an organic fraction (Wood et al, 1983), and the remainder of which is an inorganic fraction that consists of mineral fragments and variously associated microelements
We have investigated microelement, and major element leaching during and immediately after coal ash transport to the dump of theNikola Tesla A'' power plant in Obrenovac, Yugoslavia
While previous work done on samples from this power plant was aimed at establishing major associations and leaching characteristics of trace and major elements, this particular investigation was the first one addressing actual pollution occurring during coal ash suspension and transport processes
Summary
Coal can be defined as combustible sedimentary rock, consisting of at least 50% of an organic fraction (Wood et al, 1983), and the remainder of which is an inorganic fraction that consists of mineral fragments and variously associated microelements. All of the elements in coal can be found in a variety of forms, determining the coal's technological, economical and ecological impact (Ruppert et al, 1995). Coal combustion in power plants generates large amounts of ash that is marginally used (construction industry, agriculture, glass production) (Nesic et al, 1997; Faber et al, 1995; Boccaccini et al, 1997) or, in most cases, stored more or less unprotected in the environment where it can represent a significant source of heavy metals, PAHs and other pollutants. We have investigated microelement, and major element leaching during and immediately after coal ash transport to the dump of the`Nikola Tesla A'' power plant in Obrenovac, Yugoslavia
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