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If this condition occurs during hot, humid weather, moisture accumulation and mildew can occur within several weeks.
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An improper startup sequence will prevent a forced air system from performing according to the design intent. The startup sequence of HVAC forced air systems is also a critical aspect of commissioning a building. Airflow measurements at these points alone cannot properly assess the performance of the HVAC system or its impact on the characteristics of a building because they fail to fully consider air distribution. This is because current commissioning techniques are based on measurement of airflows at delivery and extraction points, such as a supply registers and exhaust grilles.
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Unfortunately current HVAC commissioning procedures are unable to accurately determine if the HVAC design intent has been accomplished. A primary cause of air leakage is depressurisation of the building by the HVAC system, although many HVAC designs have the opposite intent - to pressurise the building. Concludes that moisture related damage in commercial buildings can result in millions of dollars in damage annually and can come from five possible sources of moisture: bulk moisture intrusion internally generated moisture vapour moisture diffusion capillarity air leakage. Building air chases used as a distribution system 3. In each case also, mould growth was determined to be caused by moisture accumulation in the drywall, primarily from the uncontrolled flow of outside air into the building envelope. In each case the authors were contacted to determine the cause of mould growth on interior drywall. USA, IEQ Strategies, August 1999, pp 8-13, 9 figs.ĭescribes case studies which demonstrate the various ways that forced-air systems can significantly affect building pressures. #NO 12381 Building pressurisation can affect possibility of mould growth. From the study on the MEP coordination costs and the effect of field generated conflicts on these costs and project productivity, this thesis concludes that the investments in coordination typically pay for themselves by reducing conflicts and field generated change order costs in MEP intensive projects.Moisture and Condensation Problems in Buildings The classification of the constraints based on the resulting type of conflicts helps the project participants to have an idea on which constraints have to be given more importance while designing the MEP systems. clearance related constraints) in comparison to Autodesk® Building Systems (ABS). The Thesis concludes that using NavisWorks for conflict detection and management does enhance the knowledge on the constraint-based conflicts (e.g. Also, a quantification of MEP coordination costs sustained in the project and the cost and productivity benefits resulting by implementing 3D MEP coordination for the project have been discussed. To achieve this objective the 3D Models of the MEP Systems of University of British Columbia’s (UBC) Chemical and Biological Engineering Building have been analyzed for the constraint-based conflicts and the constraints governing the MEP systems have been classified based on the resulting type of conflict they generate. The main objective of this thesis is elaborate on the role of constraint-based design in MEP coordination process in conjunction with checking for constraint-based conflicts using the state-of- the-art tool, NavisWorks JetStream (NavisWorks). The current MEP coordination process used in the industry is highly fragmented between design and construction firms, the level of technology used in different coordination scenarios varies significantly and does not provide a facility model for use over the complete life cycle. Specialty contractors are typically responsible for the coordination of MEP systems, including checking clearances and identifying routes, fabrication details, and installation locations. Building system coordination involves the detailed layout and configuration of the various building systems such that it complies with design, construction, and operations criteria. The MEP scope now includes additional systems such as fire protection, controls, process piping, and telephone / datacom. With increases in the functionality and complexity of buildings, projects now include much more than just the traditional Mechanical, Electrical, and Plumbing (MEP) systems. Traditionally, building systems are parts of the buildings that temper the building environment, distribute energy, allow for communication, enable critical manufacturing process, and provide and dispose water. Coordination is an integral part of many activities during the life of a construction project.