Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/151553
Title: SELECTION CRITERIA FOR CENTRAL AND INDIVIDUAL AIR HANDLING UNITS FOR A TALL AIR-CONDITIONED BUILDING
Authors: LIAQUAT ALLY AKHAND
Issue Date: 1998
Citation: LIAQUAT ALLY AKHAND (1998). SELECTION CRITERIA FOR CENTRAL AND INDIVIDUAL AIR HANDLING UNITS FOR A TALL AIR-CONDITIONED BUILDING. ScholarBank@NUS Repository.
Abstract: For complex high rise buildings, the selection of AHU requires a thorough understanding of various building elements. Multi-storey buildings tend to have higher skin-to-floor ratios than shorter, more compact structures of equal floor area and their performance is influenced by design decisions. This dissertation deals with the selection criteria of individual and central AHU system for high rise buildings. The study is based on an evaluation of occupied area resulting from design considerations, particularly the rental requirements for ducting and plant rooms for individual and central AHU system. Each case is investigated separately to obtain a solution for selecting AHU systems for a high rise building. It includes engineering calculation procedures taking into consideration general ducting arrangements. Most of the buildings are designed for a life of 40 to 60 years, with roughly quarter of this life devoted for the ducting and plant room design. Major changes of ducting, plant room and systems are unlikely to happen in the span of building's life. Therefore, the right selection of AHU system is essential. In the study, a computerised energy simulation program is used to determine air volume for a high rise building. The equal friction method in calculating friction losses is employed to size the ducts. ASHRAE Duct Fitting Database is used for calculating dynamic losses of fittings. Fans are selected from manufacturer's catalogue. Based on those computed data, the plant room area for individual AHU and central AHU systems are selected. The consequential occupied zone that is available as "lettable areas" are then compared for the two different systems. The Life-cycle cost is analysed for the ducting arrangement. The material cost, fabrication cost and installation cost are calculated for the duct. The rental benefit of the "lettable areas" is calculated.
URI: http://scholarbank.nus.edu.sg/handle/10635/151553
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