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2 System Safety : Human - Technical Facility - Environment

2 2024

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Reducing the energy consumption of the air conditioning system in clean rooms using the idle mode

Čaja Alexander, Kapjor Andrej, Vantúch Martin, Čajová-Kantová Nikola

System Safety : Human - Technical Facility - Environment

2024

Vol. 6, iss. 1

289--298

Cleanrooms, essential in various industries, demand strictly controlled environmental conditions, which significantly impact building energy consumption. Highefficiency air handling systems are crucial in these environments to ensure a continuous supply of clean air and removal of contaminants. However, the substantial energy requirements of these systems pose a significant challenge to sustainable operations. This study focuses on an innovative approach to reduce the energy consumption of air handling systems in cleanrooms through the optimization of laminar airflow. Laminar flow, renowned for its high particle capture efficiency, is commonly employed in cleanrooms. Nevertheless, its operation is energy-intensive. It was proposed a novel concept involving the segmentation of the laminar flow field and the variable adjustment of airflow velocity within individual segments. This approach enables more flexible adaptation of airflow to specific operational requirements while reducing the overall volume of air that needs to be filtered and conditioned. Experimental results demonstrate that the proposed system can significantly reduce the energy consumption of the air handling system without compromising cleanliness. Compared to conventional systems, energy consumption was reduced by up to 60% in winter and 56% in summer, while simultaneously improving air quality in the critical area above the operating table.

Flow visualization of flue gases in multi-tube electrostatic precipitators using CFD simulations

Čajová Kantová Nikola, Backa Alexander, Belány Pavol, Čaja Alexander, Jandačka Jozef

System Safety : Human - Technical Facility - Environment

2024

Vol. 6, iss. 1

201--208

Particulate matter capture is a necessary concern for safeguarding human health and quality of life. This article focuses on enhancing particulate matter capture efficiency via electrostatic precipitation. It deals with expanding the fundamental principle of the single electrode in chimney tubular precipitator to a configuration with multi-tubular precipitation chambers with the aim of increasing the collection area and consequently enhancing the overall efficiency of the separator. The velocity distribution of flue gases was observed through Computational fluid dynamics using Ansys Fluent. The collection area for each proposed separator was calculated, including its enlargement, and the flow uniformity of flue gases through the tubes was assessed. Increasing the number of tubes from one to three resulted in 1.3 times an increase in the collection area. Further expansions to 4, 5, and 7 tubes led to increases of 1.6, 1.7, and 2.1 times, respectively. It was found that due to non-uniform flow distribution through the tubes, the flue gas velocities varied, with values ranging from 0.186 to 1.178 m. s-1 . Non-uniform gas flow prevents full utilization of the separator potential, thereby reducing its efficiency. For uniform flow, it would be appropriate to seek a suitable solution for a flow straightener. Additionally, the high particle velocities should be avoided to prevent particles from being carried out of the stack with the flue gas, allowing sufficient time for capture.