Been using this free Manual D duct calculator lately and honestly… it’s a time saver 😅
If you’ve ever tried doing duct sizing manually on-site, you already know how messy it gets CFM, friction rate, static pressure… too many numbers flying around. This tool just simplifies everything. You plug in your inputs and boom instant results.
What I like is that it actually helps you get accurate duct sizes based on airflow, velocity, and pressure loss, instead of just guessing or using rough rules of thumb
Super useful whether you’re on a job site or just double-checking your design. Definitely one of those tools that makes life easier.
If you haven’t tried it yet, check out the free Manual D duct calculator by Field Promax 👍
check here - https://www.fieldpromax.com/free-tools/manual-d-duct-calculator
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Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/23301/heat-load-calculation-with-duct-design-of-a-multi-storeyed-residential-building/basavaraja-k-t
call for paper engineering, paper publication for engineering, engineering journal
The heating, ventilation, and air conditioning HVAC system is arguably the most complex system installed in a building and is responsible for a substantial component of the total building energy use. Maintaining optimal temperature and air circulation are the basis of a comfortable indoor environment 1 . This role is played by HVAC Heating, ventilation and air conditioning systems. The heat load calculations along with the duct design for a HVAC system installed in a multistorey residential building is calculated and analyzed to maintain a desired temperature based on outer environmental temperature. The duct design is analyzed which create an impact on system performance. The layout of a multistorey residential building is made by using Autodesk REVIT software. A complete air conditioning system was designed along with ducts and VAV system to control the indoor environment conditions like temperature, relative humidity, air movement, etc. Based on the obtained Heat Load Calculations CFM and T.R values were found for each spaces and ducting design was done for all the spaces by considering the quantity of CFM to be supplied. A suitable air handling unit AHU is selected based on the CFM value for multi storey residential building. With this the capacity of equipment was estimated and selected for the installation.
