Search: Posts Made By: PF4DIY
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Replies: 2
Views: 450
Posted By PF4DIY

Yes lateral movement must be prevented This...

Yes lateral movement must be prevented
This will be a very light pergola
I intend to use shades that slide on a cable for roof so this pergola will be a light rectangular frame sitting on four posts
Replies: 2
Views: 450
Posted By PF4DIY

Can I leave one of the pergola legs unattached to the ground ?

Hi all

I am planning to install a pergola over the table and 6 chairs that sit at the corner of my concrete bricks patio (rectangular). I am going to dig to install post supports for the three...
Replies: 1
Views: 873
Posted By PF4DIY

Precast concrete pavers sitting on long edging stones-do i need sand?

http://i.imgur.com/lGpOmh1.jpg

Above you can see the picture
The walk way is represented a little bit more elevated so you can see what I am talking about. although this is not shown in the...
01-04-15, 07:50 PM
Replies: 1
Views: 1,038
Posted By PF4DIY

Ho do you apply the Equal loss friction method with two extended plenums?

How do you apply the Equal loss friction method when your furnace has extended plenum in two directions?

My furnace has the extended plenum in two directions (one main duct goes to left, the other...
01-04-15, 04:50 PM
Replies: 3
Views: 542
Posted By PF4DIY

I am having the acute feeling that not doing the...

I am having the acute feeling that not doing the manual D when they finished the basement is what unbalanced my air flows.
From what I understand doing manual D for an existing system that was not...
01-04-15, 11:33 AM
Replies: 3
Views: 542
Posted By PF4DIY

How do I measure the size of a duct that runs through a finished wall (the regis

Hi guys

I am trying to redo a Manual D for my house (heating mainly).
I can pretty much determine the length of each run but I can't figure out the exact size of the ducts that are already...
12-30-14, 06:16 AM
Replies: 4
Views: 981
Posted By PF4DIY

Mine is 25 years old, it was vibrating like hell....

Mine is 25 years old, it was vibrating like hell.
All I had to do was to clean the blower, it was overloaded with dust.
http://www.luckyduct.net/images/furnace/furnace5.jpg...
12-29-14, 03:11 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

No, I don't have a problem with the program. I am...

No, I don't have a problem with the program. I am not just going to pay 50$ for something worse than a free program which does the same thing or more. Below I was replying to your recommendation to...
12-29-14, 11:38 AM
Replies: 66
Views: 4,467
Posted By PF4DIY

Here are a couple of other problems: -the...

Here are a couple of other problems:
-the program does not allow me to consider crawl space
-there is no clear delimitation between the area above grade and below grade for a basement
-there is...
12-29-14, 08:14 AM
Replies: 66
Views: 4,467
Posted By PF4DIY

This program does not allow me to add a window to...

This program does not allow me to add a window to my door. Also there is no way to add user specified values to the components you add.

How do you add something like this?...
12-28-14, 09:57 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

Is the external static pressure the same thing as...

Is the external static pressure the same thing as the Friction loss ??
12-28-14, 05:08 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

I was asking about the procedure not about the...

I was asking about the procedure not about the exact values
Your 1050 and 2500 are based on 0.1 friction loss.
My numbers are based on 0.8 which is more realistic for a 25 years old (at least!,...
12-28-14, 03:58 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

Yes that program at HVAC computer looks decent...

Yes that program at HVAC computer looks decent but so is Hot2000 (I managed to find a beta version 1 for Hot3000 but I can't see the differences)
I will give it a try, I downloaded the trial...
12-28-14, 07:14 AM
Replies: 66
Views: 4,467
Posted By PF4DIY

OK ...I have honestly tried. Just 5 minutes ago....

OK ...I have honestly tried. Just 5 minutes ago. I am trying to calm down. There is a reason why this program is free. After going through all the dialogues for one room it crashed on me and when I...
12-27-14, 09:49 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

I did manage to install Slantfin on my android...

I did manage to install Slantfin on my android phone but I wouldn't go again through calculating the heat loss.
I already did it using the Canadian equivalent for that, that is Heat2000. I posted...
12-27-14, 05:11 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

Grady , If I am to trust these numbers...

Grady ,

If I am to trust these numbers (http://www.engineeringtoolbox.com/equivalent-diameter-d_443.html) yours are off big time. This table shows 8x14 rectangular section as allowing 1750 , your...
12-27-14, 04:38 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

It is actually 76K and that is the highest and...

It is actually 76K and that is the highest and the theoretical output.
In reality is should be less than that.
The very precise area is actually 1890sqft of livable space (893 in basement ,997...
12-27-14, 12:16 PM
Replies: 8
Views: 804
Posted By PF4DIY

I think that all the above can be reduced to...

I think that all the above can be reduced to this:
Sensible Heat
The sensible heat in a heating or cooling process of air (heating or cooling capacity) can be expressed as

hs = 1.08 q dt ...
12-27-14, 11:31 AM
Replies: 66
Views: 4,467
Posted By PF4DIY

How about re positioning the basement registers...

How about re positioning the basement registers on the basement ceiling as one of the already is installed. Would shortening the basement ducts improve the CFM numbers?

Does your slide line...
12-27-14, 09:20 AM
Replies: 66
Views: 4,467
Posted By PF4DIY

Thanks Grady How did you calculate these? Do...

Thanks Grady
How did you calculate these? Do these numbers depend on the blower?

11x7 will handle 360 CFM,
14x8=600 CFM,
21x8=1050 CFM.

All flow rates are at 0.1" water column static. If...
12-27-14, 09:05 AM
Replies: 8
Views: 804
Posted By PF4DIY

I am trying to figure out if my ducts are...

I am trying to figure out if my ducts are adequate for what I am getting and what would be the CFM to be set on the blower to properly heat the house. I have weak air flow in the basement (see my...
12-27-14, 08:59 AM
Replies: 8
Views: 804
Posted By PF4DIY

There must be a correspondence between BTU and...

There must be a correspondence between BTU and temp rise
The other factors that contribute to heat lose will just influence how much longer the furnace will run compared with ideal conditions (no...
12-27-14, 08:55 AM
Replies: 8
Views: 804
Posted By PF4DIY

Two are the reasons why I am looking for a...

Two are the reasons why I am looking for a configurable temperature drop on the thermostat
-as you also said having a furnace that starts and stops every 10 minutes (let's say old house with no...
12-27-14, 08:02 AM
Replies: 8
Views: 804
Posted By PF4DIY

How do I calculate how long a furnace has 2 work 2 compensate a given temp drop?

I am trying to understand the dynamics of heating a home after the furnace size was calculated.
Say you have a 60000BTU furnace to heat a 2000 sqft home.
At the beginning of the heating season you...
12-26-14, 09:02 PM
Replies: 66
Views: 4,467
Posted By PF4DIY

Same as the others, 6 in, regular tin All of...

Same as the others, 6 in, regular tin
All of my supply registers are 5"x11"
the S like duct feeds a register that is located at the entrance door which is at exterior ground level
The main level...
Showing results 1 to 25 of 159
 


 
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