Experimental testing on passive thermosiphon beam (PTB) on negative ion air performance

• Main Author: Tok, Yun Kai
• Other Authors: Cai Wenjian
• Format: Final Year Project
• Language: English
• Published: 2018
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/74437
• Institution: Nanyang Technological University

Heating, Ventilating and Air Conditioning (HVAC) equipment is prevalent around the world. It can be used for various purposes in many types of buildings. In Singapore, due to its hot and humid climate, HVAC equipment is commonly used to provide thermal comfort. However, thermal comfort is only one of the many factors that contribute to good indoor air quality (IAQ). Due to the reliance on air conditioning, many are suffering from sick building symptoms (SBS). Indoor pollutants affect the IAQ and have a negative impact on occupants’ health, thus affecting productivity. Negative ions are commonly found in natural places and are known for their health benefits. Studies have shown that negative ions are able to clean the air of pollutants and provide people with cleaner and better air. Their benefits are not limited to relieving respiratory difficulties and shortening the recovery time from illnesses. In this experimental testing, negative ion air performance on passive thermosiphon beam (PTB) was tested. A negative ion generator was positioned in the PTB system. The position of generator as well as fall duct length of PTB system were varied. Concentration of negative ions was taken at different positions and heights in a room. Data obtained was used to analyze negative air ion performance. Results showed that negative air ion performance can be enhanced by (a) using a fan, (b) placing the negative ion generator at the end of fall duct and (c) using a longer fall duct length while keeping other factors constant. More study can be done to further improve the negative ion air performance in PTB.