I had some help in another thread and as it got off the original topic, I am starting this related thread.
I am working on a basement design. I am *not* a DIY. I have however had dismal experiences with local contractor's designs. Craftsmanship is OK, and the techs are good, but their designs have not been impressive.
I am a ME, not in the HVAC business, but I have a pretty good understanding of the subject. Fluid dynamics wat my "thing" in college. Not so much compressible fluid flows though
As I work with my contractor to get this basement installed, I want to be sure the ducts are sized properly.
I own HVAC-calc and I have done the Manual J loads using that software. This will be a 1.5 ton unit.
Here are the links to the HVAC-Calc reports:
Sorted by heatgain/summary:
beenthere and some others have pointed out that the duct sizes produced by HVAC calc are, at least in my case, much too small.
adrianf replied and has pointed me towrd doing a full Manual D worksheet to size the ducts. Unfortunately I don't have a copy of Manual D anymore .
I asked about using the Ductalator, and adrianf replied that I need to "determine the design friction rate" before using the Ductalator. Not sure how to determing the DFR, but I'd be grateful for a pointer.
Can I persuade anyone to hold my hand a little to work out the correct duct sizes for this job? I can do the calculations, with some help, if I could have a hand at a start. I am positive the subs who have quoted this job are not doing this level of design, so anything I do in the right direction ought to help.
I'm surprised the HVAC-calc people don't offer any better methods to incorporate frictionlosses into their software, but alas, I don't see any.
Does anyone make a reasonably priced Manual D software calculator? I don't mind the investment to ensure my system is built correctly.