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  Topic Review (Newest First)
02-03-2011 12:35 AM
Originally Posted by mitiempo View Post
If the water is 85 degrees wouldn't the air be a bit warmer, or at least as warm as that?
Yep, that's the truth.

In the tropics an ambient air temp of 35 degrees C is not uncommon and under those conditions it will negatively affect an air cooled unit. There is no doubt in my mind that a water-cooled condenser is the better way to go.

The only reason I never did that was because to get to an existing skin fitting from where the fridge installation is located was a total mission so I've opted for air-cooled. I may live to regret that choice.
02-02-2011 11:22 PM
RichH Frigoboat doesnt much go past the 15 deg. 'approach' and it has HUGE surface area. BIG difference between the long run 'coil' of a Frigoboat and the small 2-3 ft. CuNi coil of a 'standard' system.
02-02-2011 10:55 PM
mitiempo Frigoboat seems to disagree. From their site:
02-02-2011 09:01 PM
RichH The heat transfer based on most refrig. Hx. is designed for a 15 F. degree 'approach' and are based on a maximum water inlet temp of 85 F. deg. (outlet @ 100 deg. F). Once you go beyond the 85F inlet and exceed the 15 'approach' the thermal transfer becomes VERY inefficient. ... and you need a Much larger than normal Hx and a Much higher flow of 'cooling' water to do the transfer. Simple heat transfer calculations and normal practices.
02-02-2011 07:44 PM
nickmerc When the temps rise and I turn on the water pump in addition to the air cooling my amp hours go down for the day vs using just air cooling.
Avandia Settlements
02-02-2011 10:31 AM
mitiempo Frigoboat's water cooled system has no pump or moving parts. It is highly rated.

Frigoboat Home Page
02-02-2011 08:18 AM
lancelot9898 Another factor to consider is the energy usage of that water pump not to mention the upkeep. Tarps over the boat should help keep the cabin to tolerable temperatures for the crew and that should provide a half way decent heat sink for the air cooled unit.
02-01-2011 10:42 PM
nickmerc Plus water can carry more energy than air. To back that up the manual on my AB cold plate suggests water cooling for warmer climates. Also, in the winter you will notice that if you run a humidifier, either whole house or in the room with the thermostat, the furnace will have longer off times.

I run mine on air cooling in cooler weather then turn on the water cooling in addition to the air when it gets warm.
02-01-2011 10:25 PM
mitiempo If the water is 85 degrees wouldn't the air be a bit warmer, or at least as warm as that?
02-01-2011 08:27 PM
RichH Depends on where you sail.
In the tropics, the ambient water is usually too warm (over 85 deg.) & water cooled is quite ineffective, energy wise. So, in the tropics you really more depend on air cooled then water-cooled adjunct.

To me, the best of all worlds is an air/water cooled, as when the water is too hot you simply turn off the pump and allow all the heat transfer by air cooling. Plus, when youre on the hard, turn off the pump and still have refrigeration.

All that stated, the 'best' is attained by 'monster' or Ultra-efficient insulation of the 'box', then your heat transfer and energy demand will be much much lower.
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