Principles of Refrigeration
March 30, 2011 by admin
Filed under Decorating & Remodeling
Federal Security Agency US Office of Education Division of Visual Aids Principles of Refrigeration AVA12779VNB1 The principles of refrigeration explained.
Video Rating: 4 / 5
We braze in a TXV on a refrigeration evaporator.
Video Rating: 4 / 5
It takes 144 btus to change water to ice and it takes 970 btu’s of heat to change a liquid to a gas and vice versa.
very very useful and clear.thank you very much
this is fantastic now everybody knows dummy
Compression refrigeration seem more efficient.
@BloodMired420 thank youu! English isnt my first language, learned a new word hehe
@Drealina123 “two adjacent bodies”
zzzz
Gud One….. thanks
what does he say at 5:20 – 5:23
“..flow to the warmer to the cooler of 2 …?…. bodies…”
This is so great… Thank you so much for posting this.
Awesome video!
Excellent!!!!
@anthonyeaj ^ Why even comment on the fact that it’s old school. Captain Obvious, you have been relieved of your post. Stand down sir!
great video,easy to understand..
This is simple to explain, miracles…..
NICE VIDEO DETAILED PRINCIPLE…..
Thank you. Looking for future vids
nice video
thanks a lot!!!
taught me something thank you
Excellent vide
nice video
lol no it makes sense actually. thanks. cuz its true water boils at 212F or 100C then it becomes vapour. so im pretty sure its the same concept, theres to temp difference on the ice cube, but it changes state which is latent heat.
I just got confussed for a sec lol thanks for making me realize it.
hi mate, i think you mean latent heat, which is a change of state but not temp. So if water is going to turn to steam, it will heat up then it will reach its saturation point, which means the water cannot absorb any more heat, so then it will change into steam with out any more heat. im not very good at explain these things
i dont get how ice melts, if the temp stays at 32F or 0 C? shouldnt the ice get hotter since its melting?
Thanks
Hate to sound like a critic but you don’t nee to wrap the valve, especially a Danfoss valve. I have never burned up a valve in 27 years or had one fail. Staybrite 8 soft solder is acceptable, but most people do not know how to use it. It actually has close to the same tinsel strength of harris 15. Believe it or not. The outlet braze is too cold and the brazing rod is not being drawn into the joint. A professional fitter can weld a joint from one angle. The valve is most likely a GVE1C R22 valve
Did you guys just take a ten minute video of wrapping a TXV with a towel??? Than melt your brazing rod with the torch instead of allowing the metal to melt it. Cool Gel would have protected the valve and taken off about 99% of your video.
@brianempson We kept purging the evaporator with nitrogen every few minutes or so.
Do you have nitrogen running through it the whole time or just fill it to 1 psi, disconnect, and braze?
@DrZarkloff
mr jim wat size is the txv… how btu’s is the coil? and how big is the compressor?
@craigzg3 no dry nitrogen…no thermal heat trap gel…no boot covers(in case u gotta go inside customers home
thank you… i thank you, my section 608 thanks you, my Porun cert. thanks you… but seriously i didn’t see the dry nitrogen tank. i was trained to pump thru 3 psi
Using a liquid thermal trap gel works a lot better to protect TXV valves and other sensitive equipment than wet rags.
@emsbas1 It is not recommended.
@DrZarkloff for a freezer you can use soft solder number 8 can hold up to 1500 psi and is recommended by sprolan
@emsbas1 Soft solder should never be used on refrigeration circuits.
Did you know you can use soft solder it requires less temperature to become a liquid. It is actually the recommendation of Sprorlan Valves to use Soft Solder.
Should direct torch flame away from valve body, flow nitrogen to avoid oxidation flakes inside lines. For “smaller” lines, apply heat on one side of joint, and silfos 90 degrees or so from flame, and let solder run to the heated location, rather than apply silfos-15 at flame site as seen, to much solder applied for line size I think. A squirt drink bottle is nice to easily re-wet the heat sink rags while busy one-man sweating, but do protect that manifold, t-shirt rag strips are indeed the best.
@DrZarkloff
i still cant believe u use 3/8 liquid
People do not understand that us Techs have “a way” not “the way”, We all have our little techniques that work, such as Dr.Z’s rag for heat protecting the txv. Besides if your not a Tech, you shouldn’t be working on a refer system anyway.
@jhood360 Yes, we did.
Quick question, while brazing, oxidation occurs creating a sooty like substance inside and outside the copper. This substance circulating through the system once charged and running creates problems. A way that i know to prevent this from happining is running only 1 psi of nitrogen through the copper, preventing the form of oxidation, any more than that i know can actually make the copper resist the flame and not get to right temps. Did you think about this at all befor brazing?
@cefservices09
no obviously you idiots dont know what pipe to use
@cefservices09 Thanks
@DrZarkloff — never mind poland2010 … he is a total waste of comment
You DrZarloff know your profession.. I truely respect you as a professional.
@DrZarkloff
1. how big was your tx valve
2. how big was your coil
3. how big was your compressor?
4. was the compressor mounted close by?
or was a remote condenser or rooftop unit?
@poland2010 If the system calls for 3/8 then that’s what you have to use.
@DrZarkloff
i’m talking about 3/8 liquid line….. why would you use that why not 1/4 or 5/16
@poland2010 Are you talking about a liquid line filter drier? A filter drier filters out the moisture and non condensables.
is there a reason why you installed 3/8 liquid?