Abstract
Volatile organic compounds (VOCs) such as toluene, xylene, and formaldehyde are commonly found in indoor and the VOCs will yield human health’s issue. The compounds are crucial in determining the indoor air quality (IAQ) and hence being how to manage IAQ becomes an important topic. Most human may spend most of time living in poor IAQ environment and it may result in excess life risk to respiratory symptoms and billion US dollars cost annually. VOC degrades IAQ and high VOC density indoor is not uncommon. The World Health Organization (WHO) and the Government of Canada provided benchmarks on the harm levels and the benchmarks indicated the potential health risk caused by hazardous substances. In this paper, a new comprehensive control scheme, namely fuzzy genetic multi-layer control scheme (FGMLCS), is designed to manage the IAQ. The multilayer control structure is designed which includes fuzzy logic together with genetic algorithm and multi-objective optimization to give an optimal control for a better IAQ. Q factor is defined based on the “harm levels” set by the benchmarks to give a unified standard for various VOCs with different “harm levels”. FGMLCS has achieved VOC density better than the “harm levels” by over 57%, which is superior to the benchmarks and is able to lower the risk of health deterioration and thus aiding habitant to be less carcinogenic.
Highlights
Indoor air quality (IAQ) refers to the quality of the air in buildings
(2) Q factor is defined to reflect the Volatile organic compounds (VOCs) problem based on the ‘‘harm levels’’ set by the benchmarks [1], [2]. (3) fuzzy genetic multi-layer control scheme (FGMLCS) cooperated with the constraint direct control layer (CDCL) was developed and result indicated that FGMLCS achieved a better IAQ performance in terms of VOC reduction by 57%
The output of optimization layer (OPL) is divided into two types: output to plant (v, temperature setting (Ts))opt,t to affect the output of the CDCL (v, Ts)t+1; and the expected environmental parameters (T, D (VOCn))exp,t which will be compared with (T, D (VOCn))t at time t
Summary
Indoor air quality (IAQ) refers to the quality of the air in buildings. Improving IAQ can improve human being’s health. Hung et al.: Adaptive Indoor Air Quality Control Scheme for Minimizing VOCs Density especially organic chemicals, are always found in household products such as wax, paints and pesticides. These products can release VOCs even if they are held in store only. Reduction of VOCs by using low-VOC furnishing or paints or storing unused chemicals are feasible methods These methods can only alleviate the density of VOC to some extent and they cannot ensure the level of total indoor VOC is below the benchmarks. Mad Saad et al proposed an IAQ monitoring scheme which is able to identify the sources influencing the air quality [14].
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