# Search:

Type: Posts; User: Xavier

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1. ## Thread: Inline duct fan failure

by Xavier
Replies
10
Views
652

### Flow vs Velocity

CVBees

In addition to your other issues, an “inline fan” REDUCES flow! ;)
2. ## Thread: Temperature variations due to lack of return?

by Xavier
Replies
40
Views
1,466

### Great Calculations Motoguy AKA "SWAG"

Yes Mr. Bill that is >1,200 sq ft per ton plus the basement!;)
3. ## Thread: Outside Combustion Air

by Xavier
Replies
27
Views
1,492

### What number do you want?

HVACRDEDIC

To be accurate:

In the case of fossil fuels burnt in air, the combustion temperature depends on all of the following:

• the heating value;
• the stoichiometric air to fuel ratio...
4. ## Thread: Outside Combustion Air

by Xavier
Replies
27
Views
1,492

### Industrial vs Residential applications

Hvacrmedic

I have read a lot about combustion air in the past 35 years, and have read your reference, however it appears that they are addressing “Industrial applications” not residential.

"...
5. ## Thread: Outside Combustion Air

by Xavier
Replies
27
Views
1,492

### "IAQ" Indoor Air "QUANTITY" (IAQQ)

Here is the formula I posted on 10/9/11:

“The chemical equation for burning natural gas is:

CH4 + 9.52 Air (O2 + N2) = CO2 + H2O + 7.43N2

(This does not include dilution/secondary air.)
...
6. ## Thread: How Far Above The Coil Does A Humidifier Need To Be?

by Xavier
Replies
9
Views
963

### air volume

I do not recommend by-pass humidifiers because they reduce air volume to the building by as much as 10%.

Get a powered one. A little noise but more conditioned air to the living space.:angel:
...
7. ## Thread: no combustion air for gas furnace

by Xavier
Replies
19
Views
1,239

### Chemistry Not Opinions

The chemical equation for burning natural gas is:

CH4 + 9.52 Air (O2 + N2) = CO2 + H2O + 7.43N2

(This does not include dilution/secondary air.)

X
8. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### How many pounds of potatoes can you put in a 2 pound bag

Cherokee, when you have a minute could you answer my question if there are recessed lights in the second floor that lead to the attic, or if you have a whole house fan?

On the same line do you...
9. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### In and Out

Shophound:“Which I can't discuss unless I consider the entire dynamic of the envelope and HVAC system. Which is what I'm doing. And which I now see in multiple story structures, return air location...
10. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### Fact or Fiction

Lynn I agree with your statements, furthermore not many understand that the dirt gets PUSHED into a “vacuum cleaner!” Until this is understood this discussion will continue for another ten years!
...
11. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### Path of least resistance

This post is getting way to deep for me and even my nemesis Carnak.

I think what you are attempting to explain is called the “Neutral Plane” of a building.

Second; what you are describing is...
12. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### 100 degrees F

Yesterday ambient temperature was 100 degrees F around 4:00 PM. Attic temperature 132 degrees F and in the Sun 114 F.

My system came on at 4:10 pm and ran continually until 7:25 PM (Confirming my...
13. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### Do it Right!

Quote:
Originally Posted by Xavier
I have stated for years that my HVAC system for my 3,500 sq. ft. two story home in full sun is 48,000 BTU’s for heating...
14. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### Air in a Bottle!

First the great news, the part I designed for my Jag works great.

I also updated the alternator to a new design that I discussed with someone who builds and repairs them (Expert) and “we” came up...
15. ## Thread: 2nd story not cooling off

by Xavier
Replies
311
Views
14,751

### HVAC Return Design

Hi Brian, how have you been?

Today I am waiting for some custom parts that I designed for my Jag to be done by a tool and die shop, so I checked in on HVAC.

Thanks for carrying the “torch”...
16. ## Thread: Jim Dulley thinks humidity solved with ECM - comments?

by Xavier
Replies
281
Views
6,927

### Do it "ALL" right!

Hi Robin. I too miss my “nemesis”!

Can you please explain how changing CFM (besides running longer) on a system with a "TXV" will affect RH.

You know my position: 2 tons @ >500 CFM's for my...
17. ## Thread: Time to switch the returns for Fall.

by Xavier
Replies
446
Views
23,975

### Stay Cool

This year’s post is dedicated to my friend and adversary.

Time to open the upper returns and close the bottom ones.

I am sure he does not have to switch his returns because I know he has great...
18. ## Thread: Hot or Cold for Bypass Humidifier

by Xavier
Replies
14
Views
1,163

### Hot/Cold or NONE!

I use hot water and a clear drain line in my “powered” flow through humidifier with a ball valve to control water flow through.

Because I have reduced/eliminated uncontrolled air exchanges in my...

by Xavier
Replies
17
Views
2,609

### Merry Christmas to all.

Merry Christmas

I posted this explanation as my early Charismas present hoping this one would be understood and reduce everyone’s energy costs (my Christmas present to all).

Since no one has...

by Xavier
Replies
17
Views
2,609

### How airplanes fly

Xman, you apparently do not understand the effect of wind on Delta P. I guess by now you have heard of a blower door test? Look it up and report back here what the effect of wind against a house is...

by Xavier
Replies
17
Views
2,609

### Quality not QUANTITY

Let me address these last two posts.

First Bob 100% of what I posted was intended to explain how a home works and help the poster. The reference to my site was because I have received several...

by Xavier
Replies
17
Views
2,609

### Houses DO NOT make air--OPEN A WINDOW

The correct and only practical answer to your question is “OPEN A WINDOW!”

For over 30 years I have been explaining how a home works (PHYSICS) including 10 years on this site and it is still not...
23. ## Thread: Time to switch the returns for Fall.

by Xavier
Replies
446
Views
23,975

### Down for Winter, Up for Summer

naiga snruter wol dna hgih ruo hctiws ot emiT.

Note: It is encouraging to continue to see each year more and more posters understanding how a home works.

P.S. However, it would be nice...
24. ## Thread: New house/foam insulation/fresh air question

by Xavier
Replies
23
Views
2,830

### New Technology

[QUOTE=energy_rater_La;7889511]TB
the program I work with was until recently administered by state goverment
I guess it still is, although in part federal goverment has come in also.
the .35 ach...
25. ## Thread: Where Supply and Return Ducts Exit in Rooms?

by Xavier
Replies
202
Views
9,803

### Quality or Quantity

First point:

Ton of air conditioning
by Robert Fogt (Guest) on 05/09/01 at 18:46:52
I found this information:
One ton of capacity equals 12,000 Btu/h

Second point: are you stating there is...
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