'What Code Officials Need To Know About HVAC System Design' Part 1 - Load Calculations

"What Code Officials Need To Know About HVAC System Design" Part 1 - Load Calculations

[KenTraining]

Can you help me

I am wanting to find CFM’s for rooms once I know the Btu/h
heating and cooling loads.

I have the Manual J8AE spread sheet and the CFM outputs seem
high to me and I wanted to see other calculations.

I tried the Sensible Heat Formula of CFM = Sensible Btuh / 1.1 * Delta T

But when I input those numbers I get higher CFM needed in

areas that have lower Btuh heat loss/gain.

Here is my example

Home is in Laguna Beach California

The area labeled 1st Flr Master Bedroom has a
heat loss of 9138 Btuh and a Heat Gain of 4807 Btuh

Manual J8AE want to provide 299 cfm for heating and less air
(244 cfm) for cooling

If I do the sensible heat formula CFM = Sensible Btuh / 1.1
x ∆ T, I am using 29 ∆ T for heating and 10 ∆ T for cooling

I get 286 cfm for heating and more air (437 cfm) for cooling.

This does not make sense to me with needing more cfm with less of a Btuh load.

Can you show me where I am thrown off?

[Studio-]

can these systems be installed in rated ceilings?

[antonsolo]

I am an engineer designer hvac from Russia .I want to work in America by the engineer designer hvac, what do I need to do. Can link to documents, books.

[nishanttak]

Designing air conditioning system for a three screen indoor air quality

[deezynar]

So, he says the plans examiner is supposed to be on the look out for calculations that have been fudged to make it look like a bigger, more expensive, unit is required.  Really?  Surely a contractor who makes money off of selling equipment wouldn't want to sell a more expensive unit if he doesn't have to.