Refrigeration the Basics - Page 5

Dilz · 25th September 2004, 10:34 AM

I'll ask here. Where is that Excel file that you made with the different freezing points of methanol?

Silver_Platinum · 25th September 2004, 10:39 AM

Everything is on www.silverplatinum.tk when you get there click on "Phase-Change Database" and there are a handfull of helpful links. I will be extending that list thanks to Kayl, and others.
The direct link to the file is here:
Clicky

Cannula · 25th September 2004, 10:49 AM

Just a general question.
When I was doing my Refrigeration Mechanic Apprenticeship everyone was talking about how good scroll compressors are and how they will dominate the market over hermetics soon. Are they available for home-built systems or was there something wrong with them long term? I could check out a refrig site but I read this and thought someone might know.

Silver_Platinum · 26th September 2004, 4:27 PM

To be honest with you I’m not quite sure. I believe the main downside/disadvantage of a scroll compressor is the production costs. Apparently from what I have read, a scroll compressor’s performance can appear at a disadvantage compared with a semi-hermetic compressor. Again, I have not read much about Scroll compressors.

Youbloodybeauty · 2nd October 2004, 9:44 PM

Quote:

When I was doing my Refrigeration Mechanic Apprenticeship everyone was talking about how good scroll compressors are and how they will dominate the market over hermetics soon. Are they available for home-built systems or was there something wrong with them long term?

The cost of building them makes it prohibitive. That's why unit's under about 1/3 hp are all reciprocating. They'd be ideal for domestic use because they're so quiet.

Marbig · 8th October 2004, 6:32 PM

Hmm, I got a fridge yesterday and there is not evap visible, just some thermostat what is up with that.

CS-Phr34k · 8th October 2004, 7:24 PM

Quote:

Originally posted by Marbig
Hmm, I got a fridge yesterday and there is not evap visible, just some thermostat what is up with that.

The "bars" that you can see on the inside of the fridge and freezer are the evaporator.

Marbig · 8th October 2004, 7:36 PM

Quote:

Originally posted by CS-Phr34k
The "bars" that you can see on the inside of the fridge and freezer are the evaporator.

There are no bars or panels on the fridge that is my problem

Silver_Platinum · 9th October 2004, 8:46 AM

Now I'm going to assume here that the evaporator is behind the 'back panel' on the inside of the fridge. Now remove the back panel on the inside of the fridge causing minimal damage if you want to use the fridge. After you removed the internal back panel you should see an aluminium radiator type thing (the evaporator), with a fan over it. That is your evaporator.

This type of fridge is not as common as other ones, what happens is the evaporator 'gets cold' and the fan blows this cold air throughout the fridge and/or freezer. If you look inside the fridge on the back panel you should be able to see some sort of venting system, which is where the air comes from. You will have to be patient if you want to keep the fridge intact, be aware of all pipping, wiring etc around the fridge. Some photos would make things a lot easier for all of us.

Youbloodybeauty · 9th October 2004, 9:50 AM

Quote:

Originally posted by Marbig
There are no bars or panels on the fridge that is my problem

Sounds like a frost free where the evap coil is hidden behind the back wall of the freezer and cold air is ducted from there to the medium temp section.

Marbig · 9th October 2004, 11:01 AM

Thanks for that guys (Silver_Platinun and youbloodybeuty). I found the evap just where you both said it was.
SP I won't be salvaging the fridge so I had a fun time hacking into it.

Silver_Platinum · 9th October 2004, 8:36 PM

Marbig,
Could you please give me the dimensions of the fan, I'm interested in it (that is if you are not going to use it).

Marbig · 10th October 2004, 8:46 AM

Quote:

Originally Posted by Silver_Platinum

Marbig,
Could you please give me the dimensions of the fan, I'm interested in it (that is if you are not going to use it).

Check your PM mate

kayl · 11th October 2004, 5:49 PM

Quote:

Originally Posted by Marbig

Hmm, I got a fridge yesterday and there is not evap visible, just some thermostat what is up with that.

hey is there any chance ya could give us some snap shots of the fridge, and even the compressor so we can see what size it is
cause unless its a good size ya wont get very good temps and would be a waste of time ripping it appart to find ya have to get a bigger on later on.

Silver_Platinum · 11th October 2004, 9:15 PM

It is the exact same one as mine, which in return means similar to yours. Hope that makes sense

I think my compressors struggling to pull a decent vacumn. I will have to check that out.

I probaly start a thread similar to yours Kayl sometime in the next two weeks.

25th September 2004, 10:34 AM	#61
Dilz Member Join Date: Oct 2003 Location: Australia Posts: 570	I'll ask here. Where is that Excel file that you made with the different freezing points of methanol? __________________ Sig Virus-Please copy me

25th September 2004, 10:39 AM	#62
Silver_Platinum Member Join Date: Apr 2004 Location: Mt.Waverley(Vic) Posts: 1,322	Everything is on www.silverplatinum.tk when you get there click on "Phase-Change Database" and there are a handfull of helpful links. I will be extending that list thanks to Kayl, and others. The direct link to the file is here: Clicky __________________ Silver Platinum "Standing on the defensive indicates insufficient strength; attacking, a superabundance of strength" -Sun Tzu

25th September 2004, 10:49 AM	#63
Cannula Member Join Date: Jun 2002 Location: Lisarow 2250 Posts: 473	Just a general question. When I was doing my Refrigeration Mechanic Apprenticeship everyone was talking about how good scroll compressors are and how they will dominate the market over hermetics soon. Are they available for home-built systems or was there something wrong with them long term? I could check out a refrig site but I read this and thought someone might know. __________________ "Fighting for peace is like fucking for virginity." \| OCAU Aquarium Club Member #133 \| OCAU Night Owl #233 \| OCAU GuitarPlayers Club #133 \| OCAU METAL CLUBMEMBER #33 \| TUALATIN IN A VIA 133A CLUB \| \|Successfully Traded With: 34 in total, last 20 were; tez, Fluffy_duck, tan50, jOb, Kyl3, MeoW, half-cut, Ozdood, x0nt, unixyk, _slacker_, bombastic, mototo, ]-[ellfire, Omarko, kona_boy, Flash, vazzy, Cyb3r, tez\|

26th September 2004, 4:27 PM	#64
Silver_Platinum Member Join Date: Apr 2004 Location: Mt.Waverley(Vic) Posts: 1,322	To be honest with you I’m not quite sure. I believe the main downside/disadvantage of a scroll compressor is the production costs. Apparently from what I have read, a scroll compressor’s performance can appear at a disadvantage compared with a semi-hermetic compressor. Again, I have not read much about Scroll compressors. __________________ Silver Platinum "Standing on the defensive indicates insufficient strength; attacking, a superabundance of strength" -Sun Tzu Last edited by Silver_Platinum; 26th September 2004 at 4:27 PM.

8th October 2004, 6:32 PM	#66
Marbig Member Join Date: Sep 2004 Location: Melbourne Posts: 292	Hmm, I got a fridge yesterday and there is not evap visible, just some thermostat what is up with that. __________________ Marbig

9th October 2004, 8:46 AM	#69
Silver_Platinum Member Join Date: Apr 2004 Location: Mt.Waverley(Vic) Posts: 1,322	Now I'm going to assume here that the evaporator is behind the 'back panel' on the inside of the fridge. Now remove the back panel on the inside of the fridge causing minimal damage if you want to use the fridge. After you removed the internal back panel you should see an aluminium radiator type thing (the evaporator), with a fan over it. That is your evaporator. This type of fridge is not as common as other ones, what happens is the evaporator 'gets cold' and the fan blows this cold air throughout the fridge and/or freezer. If you look inside the fridge on the back panel you should be able to see some sort of venting system, which is where the air comes from. You will have to be patient if you want to keep the fridge intact, be aware of all pipping, wiring etc around the fridge. Some photos would make things a lot easier for all of us. __________________ Silver Platinum "Standing on the defensive indicates insufficient strength; attacking, a superabundance of strength" -Sun Tzu

9th October 2004, 11:01 AM	#71
Marbig Member Join Date: Sep 2004 Location: Melbourne Posts: 292	Thanks for that guys (Silver_Platinun and youbloodybeuty). I found the evap just where you both said it was. SP I won't be salvaging the fridge so I had a fun time hacking into it. __________________ Marbig

9th October 2004, 8:36 PM	#72
Silver_Platinum Member Join Date: Apr 2004 Location: Mt.Waverley(Vic) Posts: 1,322	Marbig, Could you please give me the dimensions of the fan, I'm interested in it (that is if you are not going to use it). __________________ Silver Platinum "Standing on the defensive indicates insufficient strength; attacking, a superabundance of strength" -Sun Tzu

11th October 2004, 9:15 PM	#75
Silver_Platinum Member Join Date: Apr 2004 Location: Mt.Waverley(Vic) Posts: 1,322	It is the exact same one as mine, which in return means similar to yours. Hope that makes sense I think my compressors struggling to pull a decent vacumn. I will have to check that out. I probaly start a thread similar to yours Kayl sometime in the next two weeks. __________________ Silver Platinum "Standing on the defensive indicates insufficient strength; attacking, a superabundance of strength" -Sun Tzu