HVAC SYSTEM DESIGN TUTORIAL-CALCULATE STATIC PRESSURE/AIR VELOCITY &SIZE DUCT WITH MCQUAY SIZE TOOL

This is 38th HVAC SYSTEM DESIGN Tutorial for beginners. In this tutorial, we will:
Continue on the one storey office building example with a roof top unit serving the entire building.
Use McQuay Duct Sizer Tool and overview the static pressure drop in the duct and identify the critical path.
Introduce the duct size based on equal friction pressure drop method
Introduce the calculation method of duct sections and fittings’ pressure drop.
-Review duct size calculation table/ calculation sheet.
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[@denisramos8431]

Can I request Sir. The step by step design of HVAC in high rise building. Like.. in my proctice First compute the cooling load every room,office, cinema, etc.. after that size of ducting, after sizing, whats next?

[@TheWorldofBuildingDesign]

Your question is very broad and can not be responded in one short reply. In general once you have conducted all the laod calculation for various spaces in a building ( heating/cooling) whether manually or with the assistance of a thermal load calculation software, then you have to determine the air supply distribution duct and piping system routing in the building nd size them for the appropriate load proportional to the space. Once this is done. you will know the total air supply and exhaust CFM and for the case of hydronic system you would know the total fluid flow required in variety of spaces. These information will allow you to select and size the terminal units for appropriate capacity. This will apply to major air and hydronic distribution as well. This is a start to design the HVAC system in the building there are many other topics that have to be considered in terms of the building systems' installation, construction, commissioning sequence of operation, control strategy and many more to be considered during design. This is just the beginning to understand the extensiveness of HVAC system design. Please let me know if you have specific question. Cheers