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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Refrigeration-Frigoboat Keel Cooled vs. others?
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Thread: Refrigeration-Frigoboat Keel Cooled vs. others? Reply to Thread
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Topic Review (Newest First)
07-20-2014 08:57 PM
smurphny
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

Quote:
Originally Posted by SchockT View Post
If you are having to run your thermostat at it's warmest setting in order not to freeze the contents then your thermostat is probably intended to control the evaporator temperature rather than the box temperature. If the unit didn't come with clips to attach the sensing tube to the plate, then try putting it between the evaporator plate and the box wall so that it is pressing against the plate. That will serve to hide and protect the fragile cap tube, as well as giving it an accurate measurement of evaporator temperature.
Thanks for that info. because that's exactly what I wound up doing after a lot of experimentation. There were no clips included with the unit but I'll probably make something to keep the tube stationary. Now, it's just slipped in behind the plate and not fixed in any set position.
07-20-2014 06:06 PM
SchockT
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

Quote:
Originally Posted by smurphny View Post
the biggest challenge seems to be in getting the stat setting low enough without being off. The placement of the thermostat sensor tube makes a tremendous amount of difference and there is NOTHING in the inadequate manual as to how to position it in a space relative to the evaporator for best efficiency. This could probably still be better.
If you are having to run your thermostat at it's warmest setting in order not to freeze the contents then your thermostat is probably intended to control the evaporator temperature rather than the box temperature. If the unit didn't come with clips to attach the sensing tube to the plate, then try putting it between the evaporator plate and the box wall so that it is pressing against the plate. That will serve to hide and protect the fragile cap tube, as well as giving it an accurate measurement of evaporator temperature.
07-20-2014 05:29 PM
T37Chef
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

I ended up installing an Isotherm unit with a BD 50 compressor used in a 7 cu/ft box. Easy to install. I'very had it for about 2 months now and just returned from 18 day sail and found it to work very well. I like that I could attach a simple dryer hose to the fan and route it low in the bilge so it's pulling cool air from the bottom of the boat while the heat escapes through a vented door in the galley. I paid about $800 during a Defender sale. The standard thermostat is nothing more than a dial, I may upgrade that part at some point but for now it's fine...keeps beer cold and ice cream frozen.

I wanted to go with the Sea Frost but just couldn't stomach the $2,000+ for one. If we were full time cruisers or live aboard we probably would have chose something else, like the Sea Frost or Fridgaboat.

Cheers
07-20-2014 02:11 PM
smurphny
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

I get the basic principles of HVAC. Had a lot of doubt about being able to actually have refrigeration with only a couple of solar panels and an occasional alternator charge. So far I give the Isotherm unit an A even though the installation lit. is poor.

Just noticed your bench link. Nice work!
07-20-2014 12:52 PM
deniseO30
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

Air conditioning compressors used to be designed receive cooling from the saturated gas coming back.

Refrigeration compressors all types will get warm, even hot from the motor windings and the heat of the refrigerant being compressed. The returning gas is not as "saturated"
07-19-2014 05:58 PM
smurphny
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

Quote:
Originally Posted by deniseO30 View Post
Just a hint since I'm not loyal or have any fondness for Danfoss 12/24 volt wonder piston compressors with modules that cost hundreds.

"swing" compressor quite amazing little gadget they are. engel, norcold, and I think isotherm use them.
ENGEL USA - AC/DC FRIDGE/FREEZERS | PERFORMANCE COOLERS - - Swing Motor Compressor
That looks very innovative. I have virtually zero knowledge of refrigeration but it seems like this would be excellent for a power miserly marine installation. I know the Danfoss in my Isotherm system gets quite warm to the touch when operating which translates to me as battery bank charge used up:-)
07-19-2014 05:22 PM
deniseO30
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

Just a hint since I'm not loyal or have any fondness for Danfoss 12/24 volt wonder piston compressors with modules that cost hundreds.

"swing" compressor quite amazing little gadget they are. engel, norcold, and I think isotherm use them.
ENGEL USA - AC/DC FRIDGE/FREEZERS | PERFORMANCE COOLERS - - Swing Motor Compressor
07-19-2014 03:47 PM
smurphny
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

As long as this old thread has been revived, I'll report that the Isotherm SP flat plate evaporator unit works well. With the small (2cu.') space I built in for refrigeration, the biggest challenge seems to be in getting the stat setting low enough without being off. The placement of the thermostat sensor tube makes a tremendous amount of difference and there is NOTHING in the inadequate manual as to how to position it in a space relative to the evaporator for best efficiency. This could probably still be better.

Anyway, 200 watts of solar panels keeps the beer cold:-) If it's completely overcast for 2-3 days, I'll need run the engine for about 1/2 hour but that's no biggie. With careful use of wattage for things like the SSB and computer charging, this system works but I am very stingy with use of electronic stuff and probably well below the average wattage of most boats.
07-19-2014 01:02 PM
UnionPacific
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

It is interesting that these systems can be had today for under $1000 online.
06-12-2012 10:46 AM
deniseO30
Re: Refrigeration-Frigoboat Keel Cooled vs. others?

refrigeration oils do migrate to lower and or colder areas of the system. the oil and refrigerant do mix and the oil actually does move through the system, not like in auto engines where most of it is supposed to stay put. Most of the time, when the system is running it's not an issue. On larger systems oil return traps are used in the suction (return line) Not something you would see on little 12 volt systems and domestic refrigerators
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