Just starting HVAC!!!

[boduke]

Hey ya'll. Im new to the sceen here. Im just starting HVAC school in 2 weeks and Im excited. Hey I always wondered, how does the coolers and freezers differ from an a/c? I guess i mean, how do you get lower temps from a refrigeration system? whats the main difference between a a/c, cooler and a freezer, i alwasy wondered how they made it so cold?? Man im real excited though, i cant wait to start.
any other advise??? my teachers said to try this site! So here i am!

thanks..Duke

[icecuber911]

Try to make alot of friends to get sound advice. Study hard in school and you will pick up fast. Try to land a job in the field you wanna pursue, i mean commercial or residential even if its just doing pm work. You have to be married to this field to really learn it.

[crozzy]

Yeah good luck, just pay attention man

[4x4freak]

They both use the same basic refrigeration process, but there are different equipment designs for different purposes. Most refrig. systems use different types of refrigerant than AC units and work off different pressures.

My advice is to ask questions if you dont know something. That's the best way to learn IMO.

[Edited by 4x4freak on 01-26-2006 at 04:07 PM]

[boduke]

Oh i see! So it's the different types of refrigerants that gives you lower tempratures?? Thats how it goes huh??

[4x4freak]

Not completely. There are other variables that come into play.

[crozzy]

Well man, I don't wanna get to technical on you so fast. Its better for you to hear and see it, other than read it. But here ya go for starters.

Basicly... it depends on the actual compressor displacement and the motor Horse Power installed in it and the refrigerant used.

Its not hard, you just have to see it to believe it and actually do it.

[Shophound]

A basic premise: equipment is sized according to anticipated heat load.

For instance, you have a 1,200 square foot house that may need only a 2 ton unit to maintain 75 degrees in the house when the outdoor temperature is 95 degrees.

At my building we have a 150 square foot room that has a ten ton system on it. The temperature inside that room is maintained at 20 degrees, constantly. It employs a desiccant wheel dehumidification system; the reactivation heat adds a lot to the overall heat load.

The house is only required to stay twenty degrees below outdoor temperature. The 150 square foot room has to stay at 20 degrees, no matter how warm it is outside or in the building surrounding it. This is one reason why such a small room needs such large equipment.

[rayr]

Originally posted by boduke
i alwasy wondered how they made it so cold?? Man im real excited though, i cant wait to start.
any other advise??? my teachers said to try this site! So here i am!

thanks..Duke

Start at the very beginning. First off The eqipment does not make cold. You can not make cold (not on this planet anyway) All we are able to do is remove heat. Cold does not exist. It is not a form or energy. "Cold" as we call it and know it is "an absence of heat"
You may think i am being picky but that is the beginning lesson.

[smilies]

Originally posted by rayr
Start at the very beginning. First off The eqipment does not make cold. You can not make cold (not on this planet anyway) All we are able to do is remove heat. Cold does not exist. It is not a form or energy. "Cold" as we call it and know it is "an absence of heat"
You may think i am being picky but that is the beginning lesson.

That'll probably be ten questions in first phase test about this.

[Diceman]

I dunno Raymond, my refridgerator makes my beer pretty darn cold.

[rayr]

But you are in Pittsburgh, and I specifically said "This Planet"!!

[Dowadudda]

Ray,

You know. I will often say we don't make cold, we remove heat. As soon as I say that, it seems they go, "no kidding" and usually then just let me fix it with out too much more questions.

[rayr]

To bad more don't want to know Why and How. Knowledge is such a powerfull tool.

[jumperwire]

LETS NOT FORGET THE FIRST LAW OF THERMO-DYNAMICS HEAT TRAVELS TO COLD- SECOND LAW OF THERMO-DYNAMICS HEAT CAN NEITHER BE CREATE NOR DESTROYED. THE WHOLE PROCESS IS THE BASIC PRINCIPLES OF REFRIGERATION DONT GET YOUR HEAD STARTED IN THE FAR DISTANT LEARN THE BASIC PRINCIBLES OF REFRIG. GOOD LUCK IN SCHOOL DONT QUIT WHEN IT BECOMES OVER WHELMING I ALMOST DID I ALSO TOSSED MY BOOKS AND WALKED OUT OF CLASS IN SELF DOUBT GOOD THING I HAD A GREAT TEACHER. NOW MANY MOONS LATER I WISH I DID LOL JUST KIDDING YOU GOTTA LOVE THIS STUFF TO LOVE YOUR WORK. WHEN YOU FINISH SCHOOL AND RIDE AS A HELPER AND YOUR TRAINER SAYS ALL I WANT TO HEAR IS THE SOUND OF A CANDLE BURNING SAVE SOME QUESTIONS FOR LATER. PEACE STAY AWAKE IN CLASS