International Journal of Emerging Technology and Advanced Engineering Website: www.ijetae.com (E-ISSN 2250-2459, Scopus Indexed, ISO 9001:2008 Certified Journal, Volume 12, Issue 06, June 2022) Manuscript Received: 13 March 2022, Received in Revised form: 15 May 2022, Accepted: 29 May 2022 DOI: 10.46338/ijetae0622_05 26 Improvement of Airflow Distribution for Precision Air Conditioning Data Center Mohd Hafiz Mohd Noh 1 , Ahmad Hussein Abdul Hamid 2 , Ahmad Sollehin Rasidy 3 1, 2,3 School of Mechanical Engineering, College of Engineering, Universiti Teknologi MARA, Malaysia Abstract— A Data Centre design is based on a network of computing and storage resources that enable the delivery of shared applications and data for 24 hours daily has been chosen in this study. In order to maintain a constant cool temperature and level of moisture, precision air conditioning system are installed since the electrical components produce heat when operating. This containment currently installed beside the racks and make the cool air specifically pass through the equipment. In this study, the effect of fixed size of airflow-trip at three different configurations which involve a single, double and triple airflow-trip has been simulate using ANSYS software. From the results comparison, double airflow-trip configuration produces the best result in term of air flow velocity and temperature inside the containment through outlet as compared to others configuration. Velocity flow distribution also sensitive to the airflow-trip height. Overall, adding the airflow-trip has improved the airflow and temperature distribution. Keywords— Dual conical nozzle, TOC nozzle, TIC nozzle, shockwaves, thrust. I. INTRODUCTION Data center is a facility that centralizes an organization’s IT operations and equipment, as well as where it stores, manages, and disseminates its data. Equipment in data center always non-stop operation, thus it continuously producing heat. The infrastructure of data center itself has multiple missions along with protecting the computers from natural elements like humidity, extreme temperatures, and natural disasters, the infrastructure also provides office space for the engineers and technicians who operate the data center, and it manages the computing resources [1]. In order to maintain the temperature and humidity of this facility, the precision air conditioning system being installed. This data center uses cold aisle containment system where it designed and operated in the way cold supply from hot exhaust air equipment is completely isolated [2]. In particular, this technique distinguishes the cool distribution air to the server racks and the hot exhaust air returning to air conditioning units. There are three types of containment systems which are cold aisle containment, hot aisle containment, and server rack exhaust chimneys [3]. This cooling method mainly concentrate on cooling the equipment directly. The cold air will be flow through the floor and trap inside the containment. Then it will flow through the data racks [4]. The problem is arising when only the single source of cool air inlet, which lead the distribution of cool air in the containment not well- circulated. Herewith we proposed a simple and practical solution on this problem by introducing the airflow-trip in order to make the air well distributed. Airflow-trip is a simple T-shape design device in which illustrated in Figure 4. Since the source of cool air is from bottom of the floor, so this airflow-trip shall be locating at the bottom of the data racking. ANSYS software has been use in order to analyses the airflow distribution and behavior. Initially, the simulation has been carried out without any installation of airflow-trip. Then it being follow by simulation of single airflow-trip at one location. Eventually, there are three different arrangements has been considered in this study. We believe that by locate the trip, the airflow will be improved and the distribution of cool air also being enhance. Several assumption has been made in this study, include the heat source from the data rack has been neglected. This is because, as we improve the cold air around the area, so the heat from the rack also getting reduced. II. METHODOLOGY A. Data Collection at Data Collection Center UiTM Shah Alam The schematic study site of data center and the airflow of cold air has been presented on Figure 1. Initial stage of this research has been start with on-site data collection. The dimension of the Data Center 2 area including the containment space were measured by using laser distance meter with accuracy of +2mm.