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of another system, especially a computer program designed for that purpose
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Delhi International Airport
Thermal Stress Analysis of HVAC Pipelines
Modeling and analysis
The 3D modeling for the entire pipeline network with all the bends and runs in the basement and sub-basement levels of “DIAL” were captured and modeled using efficient modeling tools as suggested by the client. The network consists of both chilled water pipes as well as condenser water pipes which stretch for nearly half a kilometer.
The analysis shows the displacement for the pipes exceed 20 mm in certain locations and also the stresses caused due to the thermal displacements. These are checked as per ASME code standards.
Figure showing the stress contour
Figure showing the modified pipe configuration
Conclusion
From the analysis it was seen that the thermal variation on the pipelines does not provide concern for the given configurations of pipelines at most of the locations though at one or two locations the pipeline was stressed. Hence it was recommended to the client that the pipelines must be provided with expansion joint at the required critical locations to accommodate pipe expansion and reduce the stresses within the limits as per the code.
Objective
The main objective of this project is to conduct a finite element based thermal analysis to determine the deflection in the pipelines in actual as well operating condition where cold water at temperature of 5.50C passes through the pipelines in the basement and sub-basement levels of Delhi International Airport (DIAL). The effect of insulation and ambient conditions are taken into account. The pipelines carrying HVAC refrigerants are stressed to their limits by temperature. In this case the refrigerant is water. These loads result in movements of the pipes. These movements in pipelines can be in axial or lateral directions based on pipeline and support orientation.
Figure showing the pipe configuration
Figure showing anchors & supports in
the pipeline
Figure showing the pipe configuration