Optimization of thermal performance in chilled beam with numerical analysis

In the literature review, it was found that induction climate control devices are used in enclosed spaces such as offices and hospitals. Unlike fan coil units, no improvement studies have been conducted on the components within the induction climate control devices. The nozzles within these devices create a vacuum environment, allowing for more efficient use of thermal energy by mixing secondary air from the space with the primary fresh air. Therefore, evaluating the placement of nozzles with a focus on thermal performance is important. The thesis first numerically analyzed the induction climate control device based on its components (nozzles) and then validated the findings with experimental studies available in the literature. Using the results obtained from the analyses on the components, a comprehensive analysis of the entire device was conducted. The thermal performance of active induction climate control devices was analyzed by optimizing the number and geometry of the nozzle components. In the numerical analyses conducted for different nozzle inlet-outlet diameter ratios (0.67, 0.50, 0.40, 0.37), it was observed that channels with radius significantly increased the induction ratio compared to channels without radius, indicating that channels with radius optimize thermal performance. The relationship between nozzle efficiency and induction ratio was also examined. After the diameter ratio exceeded 0.50, an increase in the nozzle efficiency led to a decrease in the induction ratio due to the insufficient primary air flow delivered to the space. When the nozzle inlet and outlet diameter ratio was 0.50, the nozzle efficiency was calculated as 0.40 for the channel without radius and 0.43 for the channel with radius.