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  1. Yeah, mostly Dynaflow, but a few 15% sil-phos. I...

    Yeah, mostly Dynaflow, but a few 15% sil-phos. I have found 4" of the blue rod. I just clamp them into some vise grips pliers and use 'em the rest of the way up. 1/4" joints don't need much.

    But...
  2. Ok thanks for the tips. Also, didn't know...

    Ok thanks for the tips.

    Also, didn't know brazing rods were sold individually. I'm small time (just personal and school design projects), so I've been able to just pick up the half used rods left...
  3. So when you say silver solder, I assume it's...

    So when you say silver solder, I assume it's different from the lead free plumbing solder? I know that's got a decent ammount of silver in it.

    I have a little bit of blue flux coated rod that...
  4. What to use to braze copper to stainless steel?

    Hey guys. Anyone have suggestions on what brazing alloys will work for brazing copper tubing to 304 stainless fittings? This is a plate heat exchanger as an r134 evaporator. Thanks in advance.
  5. Well, the compressors are of unknown condition,...

    Well, the compressors are of unknown condition, but they ohm ok and the oil is clean, so I assume they're probably fine. The refrigerators were junked because the starters were bad. I'd rather not...
  6. Hard start kit an acceptable replacement for fried PTC?

    I have a couple of 1/5hp refrigerator compressors with bad PTC starters. Is there any disadvantage to just replacing them with a supco 3n1? I'd rather not pay the OEM markup and have no idea which...
  7. I see what you are saying. The 3 way valve by...

    I see what you are saying. The 3 way valve by itself will not guarantee constant flow, though. It's not that simple. The glycol bypass loop will present much less flow restriction to the pump than...
  8. The performance simulation will certainly be...

    The performance simulation will certainly be complicated, but I believe I can get a pretty good approximation based on the expected ranges of operating conditions and flow rates. I have pretty...
  9. Yeah, our project faculty adviser decided to have...

    Yeah, our project faculty adviser decided to have us make the zones into equal rectangular divisions to focus on proof of concept of the control method, as the simulation and modeling of actual ice...
  10. The project as a whole is developing a zoned ice...

    The project as a whole is developing a zoned ice rink floor to be able to adjust coolant flow rates through each zone in proportion with the average heat load experienced by that zone, as heat load...
  11. It's probably going to see around -12 to -15 C...

    It's probably going to see around -12 to -15 C evap temps most of the time, but I haven't yet actually done the calculations to relate coolant entering/leaving temps with evap temps. It gets...
  12. Hmm, I was thinking about ensuring oil will...

    Hmm, I was thinking about ensuring oil will return back to the compressor, but maybe it will still return with the HX turned onto the long side with the refrigerant fittings towards the top? The...
  13. A few questions on evaporator size, liquid capacity, liquid slugging prevention, etc.

    Hey guys,

    I've got a couple questions on system design and evaporator sizing for a liquid chiller project for engineering school.

    Is it true that in designing a refrigeration system, especially...
  14. I'm interested in the JB micron gauge if you...

    I'm interested in the JB micron gauge if you still have it.
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    Ok, thanks. I thought I read that somewhere...

    Ok, thanks. I thought I read that somewhere before, just couldn't remember. There actually is ester oil available for automotive retrofits, but the viscosities are too high. I guess I'll just have...
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    Oil type for Embraco compressor?

    I have an Embraco r134a compressor, model EGU60HLC out of a household refrigerator, and the datasheet calls for ester iso10 oil. What is that, since I looked around and don't see any iso10 viscosity...
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    Been busy lately and hadn't had time to respond,...

    Been busy lately and hadn't had time to respond, but thanks for everyone's input. Sounds like a 3 in 1 is what i'm going to do.
  18. Replies
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    I couldn't PM you either. Maybe I'm not of...

    I couldn't PM you either. Maybe I'm not of sufficient posting status yet. Why not just post it here. Maybe it will be useful to someone else, too.




    I'm assuming the check valve is...
  19. Replies
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    I thought about that, too. That's probably plan...

    I thought about that, too. That's probably plan C.
  20. Replies
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    Thanks icemeister. I have ran some numbers in the...

    Thanks icemeister. I have ran some numbers in the Danfoss cap tube program and it looks like it actually won't be a very good solution due to the small cooling capacities. To get 10% capacity through...
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    I am trying to maximize flexibility for the...

    I am trying to maximize flexibility for the system to accommodate as wide a range of loads as is reasonable (anywhere from liquid cooling gaming computer hardware, general space cooling, rapid temp...
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    cap tube as a bleed port for TXV?

    Hey guys. I'm an engineering student working on a small liquid chiller project. I'm trying to find a couple R-22 expansion valves in the 1/3 to 1/2 ton range and I need them to have a bleed port...
  23. After some poking around, it appears this...

    After some poking around, it appears this compressor is a permanent split phase with a run cap between the start and run windings and no separate starting gear, but I will see if i can get a wiring...
  24. How to determine motor starter for small rotary compressor?

    Hey guys,

    I claimed a small rotary compressor off ebay, never been installed. Problem is, I did not get any of the starting gear with it and the manufacturer's site is not helpful.

    The...
  25. Thanks for that. I found some at the grocery...

    Thanks for that. I found some at the grocery store. Didn't know there was such a thing. It doesn't say what kind of salt it is, though.
  26. No, it's junior year undergrad engineering. ...

    No, it's junior year undergrad engineering.

    The official test bottles are provided on testing day, so no chance of boiling. I'll have to see what kind of salt I can get my hands on and test to...
  27. No, the bottle must be exactly as it comes from...

    No, the bottle must be exactly as it comes from the store, except maybe the label. I'll have to ask about that.
    I'll
    Unfortunately, now that it occurs to me, I don't know if i'll be able to find...
  28. Ok, thanks. The question stirring around in my...

    Ok, thanks. The question stirring around in my mind now is why can't you just shorten the cap tube/widen the orifice to restore flow to suit the lower pressure difference? Basicly tune the system...
  29. interesting. I was experimenting with a small...

    interesting. I was experimenting with a small r134 system I scrapped from a mini fridge (without losing the charge, total PITA...urethane insulation everywhere!), and it behaved like it was low on...
  30. Yeah, I thought about that. I have a recip....

    Yeah, I thought about that. I have a recip. compressor from an r-134 fridge, but it's rated for only 600 btu, but that is at -20 deg C evap temps. Not sure if using r-22 or even r404 would make up...
  31. The only rules are the bottle and the ice must be...

    The only rules are the bottle and the ice must be at least 5 ft apart and everything except the ice must be within 2 degrees C of ambient at the start, meaning no dry ice. The instructor said...
  32. Need refrigerant selection advice for custom chiller project, to freeze water

    Hey guys, I'm in the process of fleshing out some design details for a liquid chiller project for a thermal systems design course at school and am wondering if anyone has some advice for what...
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    Ahh, well, that's part of the experiment. I'm an...

    Ahh, well, that's part of the experiment. I'm an engineering student and a hardcore tinkerer by trade (if there isn't such a thing, there is now). I'll have an old portable dehumidifier that will be...
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    Ok...hehe, I'm no green freak or anything, so let...

    Ok...hehe, I'm no green freak or anything, so let me rephrase my question.

    Could the EPA fine me for venting canned air out of a refrigeration system?

    Not that anybody needed to know if I did,...
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    Hmmm, so I assume that to mean it doesn't matter...

    Hmmm, so I assume that to mean it doesn't matter in that case? That's sort of what I thought, but was just checking. I'd probably still recover it to save money, though.

    Supposedly, both R-134a...
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    Ethical question on venting

    Ok, so I'm new on this forum and couldn't decide exactly where to ask my question, but here goes.

    Technically, as per EPA regulations, ANY refrigerant (CFC,HCFC,HFC,...) must not be vented. I...
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    Actually, going to Virginia Commonwealth...

    Actually, going to Virginia Commonwealth University.

    I haven't really fleshed out the details of my future project yet. Just thinking of possibilities now. The "smart" has to do with my...
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    Hey! Engineering student checking in...

    Hello everyone. Just figured I'd introduce myself here. I'm kind of between junior and senior year studying for mechanical engineering, and find most any engineering topic, including refrigeration,...
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