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Dear Lynn,

Thank you for opening my eyes especially about the path way. I understand that I should know the total heat.

But this room is already there. I am sorry not to mention about it the...

Dear Lynn,

If I use a ventilation fan, do I know the cooling air source? Since it will vent the air from the inside out.
The max temp would be 113degF.
This is a simple application, so I will...

Dear Lynn,

If I use a ventilation fan, do I know the cooling air source? Since it will vent the air from the inside out.
The max temp would be 113degF.
This is a simple application, so I will...

It is for a room contained several electrical panels and it is coomercial ventilating.

I have not yet known how much air I need to move. But what is the next step to think of? Measuring the room...

Freon is no longer existed, OK? We have applied a new rule for this for around about 05 years ago. But Freon was produced by Dupont and at that time people did not think about they did harm to the...

I know I got a fatal mistake after posting that. But why people choose copper instead of other materials?

Oh, why suppliers choose bronze pipes for air conditioner? Is there any reason for this application? Is that the bronze pipe is the most flexible? But, not only in air conditioner, the tubes inside...

Dear HVAC experts,

What is the first important thing to be considered when doing calculation for ventilation fan?

I am not HVAC expert. My question was clearly for a ventilation mechanism (here is a fan) that will be applied for the room not air conditioning one.

It means that I need to calculate the fan...

Instead of learning HVAC, I think you will be a great politician because of your rules. And I am not and I am here to learn (I mean try to pick up as much as I can). You know. I love the people, the...

I am in the South of VN, the location is round 45kms far from Cu Chi. Well, I am here which one purpose is to try to learn. I don't know if I got you interested. Are you interested in replying...

Really? It has been a so long time. isn't it? What have you been there for?
Cu Chi is still here if you'd like to see:
http://www.cuchitunnel.org.vn/content/index.php?lan=1...

Hey Vietanh:

You said so base on what facts? I can 100% guarantee you that there are rules in every part of this world even I've not been around it. A country cannot be called a country if there...

Is this forum for international dicussion? I am glad to meet you up here and hope that I can learn much from you, the HVAC experts. I am from electrical world but it seems that electrical system and...

Hi everybody, this is my first post in this forum. It is nice to learn from you guys about HVAC. My question is for a small application of HVAC.

When I have to do electrical calculation, the first...