It was definitely a very explanatory video. We would like to see a presentation where the fittings connection rules are explained in more detail with SMACNA and ASHRAE references.
Thanks for your compliment. I think what you’re looking for is here: th-cam.com/video/NWyP7LuAaao/w-d-xo.html where I explain the duct static pressure calculation with all the fittings referenced back to ASHRAE. If you've watch it before and still need more depth in the fitting connection rules (which I understand can be confusing), I'm releasing a duct design course that will go into details about the fitting connections. You may consider subscribing to my newsletter on course.aircondlounge.com as the new course will be released on that platform.
hello thanks for your comment. Iwill be following the website for the course. I watched the other video you shared and it was very explanatory. there I am not talking about finding the Co values for each fitting. what I want to talk about is: the rules for connecting fittings to each other for all types of ducts, the maximum permitted dimensions in ashrae and other standards for all fittings and connection types.
I think the dimension of duct fittings can be anything but it is best to stay within what have been tested out for the Co value for static pressure calculation. ASHRAE Duct Fitting Database (DFDB) so far has the most combination of different dimensions and types of fittings.
Hope you could show examples for the other two methods in duct sizing:- static regain and constant velocity. Do like to share this 'equal friction method' video please.
We need to decrease the height according to cfm. However, watch out as you need to leave enough height if you’re going to tap out a collar for the flexible duct.
Generally, the AHU room should allow the duct to run through multiple rooms without much obstructions. For example, if the AHU room is located beside a staircase and air conditioning is needed on the other side of the staircase, then this AHU room location is not good because the duct needs to penetrate through the staircase which is mostly not allowed due to fire safety and other restrictions.
Use guidelines like how many CFM per terminal for noise control and throw distance (not covered in this video) to determine the number of air terminals needed.
How was the video, is it too fast?
Thank you for this!
Thank you for clear details
Thank you for taking the time to make this presentation 👍🏽
Anytime
It was definitely a very explanatory video. We would like to see a presentation where the fittings connection rules are explained in more detail with SMACNA and ASHRAE references.
Thanks for your compliment. I think what you’re looking for is here: th-cam.com/video/NWyP7LuAaao/w-d-xo.html where I explain the duct static pressure calculation with all the fittings referenced back to ASHRAE. If you've watch it before and still need more depth in the fitting connection rules (which I understand can be confusing), I'm releasing a duct design course that will go into details about the fitting connections. You may consider subscribing to my newsletter on course.aircondlounge.com as the new course will be released on that platform.
hello thanks for your comment. Iwill be following the website for the course.
I watched the other video you shared and it was very explanatory. there I am not talking about finding the Co values for each fitting. what I want to talk about is: the rules for connecting fittings to each other for all types of ducts, the maximum permitted dimensions in ashrae and other standards for all fittings and connection types.
I think the dimension of duct fittings can be anything but it is best to stay within what have been tested out for the Co value for static pressure calculation. ASHRAE Duct Fitting Database (DFDB) so far has the most combination of different dimensions and types of fittings.
Thanks a lot for this..... God bless you
Great content, thanks sir.
No problem.
thank you for making this video
Hope you could show examples for the other two methods in duct sizing:- static regain and constant velocity. Do like to share this 'equal friction method' video please.
Will put this on my list.
how did you get the volume flow rate of each room at the beginning of the video?
You need to calculate the sensible load of each room and use Qs=1.08xCFMxdT to find the airflow needed for each room.
Could you provide us with an excel sheet log of Ashre and Smanca codes if you have one please
Thank you
is height of the duct same in everyroom if the height of the ceiling is same in every room.Or do we need to decrease the height according to cfm
We need to decrease the height according to cfm. However, watch out as you need to leave enough height if you’re going to tap out a collar for the flexible duct.
Whrre do i place my ahu room? Anyside ?
Generally, the AHU room should allow the duct to run through multiple rooms without much obstructions. For example, if the AHU room is located beside a staircase and air conditioning is needed on the other side of the staircase, then this AHU room location is not good because the duct needs to penetrate through the staircase which is mostly not allowed due to fire safety and other restrictions.
Is it depends on me the "total number of air terminals / supply duct"?
Use guidelines like how many CFM per terminal for noise control and throw distance (not covered in this video) to determine the number of air terminals needed.
@aircondlounge we are still to determine the CFM for each terminal🥲 so i think i should assume?😅
@nornia6855 yes need to determine the CFM for each terminal, use the terminal catalogue to do so. Estimate also can
@@aircondlounge okay, thank you