Lee's advice rings true and is similar to much input I have recieved about
referigeration.

I especially want to comment on the line "Try to route the output air
somewhere that you want dried out."

This works like a charm.  I did that with all the plywood involved in a
closet, a settee, a berth, the head and the shower in my aft living
quarters.

When the AC is on much of the return air is drawn through all these dead
spaces (actually in-use lockers, much bedding, winter clothes, seldom used
galley gear).  I have absoutely no mildew problems.  Of course, the hull
has foam unsulation over every square mm so there is no condensation at
all.  I should put a voltage sensitive computer fan somewhere on a voltage
sensitive switch so it would come on when the battery voltage is high
(charging).


Norm
S/V Bandersnatch
Lying Julington Creek FL




> Why not get a system with a BD 80 compressor.  All claims aside, the
cooling 
> is going to be the BTU output of the compressor.  So one brand will be 
> similar to another.  Some have sensors that switch the compressor to high 
> speed when they sense charging voltage.  Water cooling is to be avoided
if 
> possible, these compressors are in the area of only 300 BTU/hour of run 
> time, not a lot of heat gain in the boat.  Try to route the output air 
> somewhere that you want dried out.  With water cooling there is the pump 
> electricity use, this is not made up in efficiency gains, there is pump 
> reliability and there is heat exchanger failure that requires total
system 
> replacement.
> 12 cu ft requires the biggest compressor you can get.  I have a 7.5 cu ft 
> and Sea Frost advises I should have a BD 80X.  When I tell them that I
get 
> by on a BD3F (~70% of a BD50), they say I  must  have great insulation. 
I 
> also recommend Sea Frost for their excellent customer support.  I had
Adler 
> Barbaur on my last boat, it never needed any service.  Sea Frost uses an 
> adjustable expansion valve instead of a capillary tube, this provides 
> adjustment of cooling temperature vs cooling volume that allows using 
> different size evaporators.  Other brands have evaporators with
integrated 
> capillary tube matched to a certain compressor.   All the current Danfoss 
> compressors are adjustable speed.  Suggest reading "12 and 24 Volt 
> Refrigeration" by Kollmann.
> Lee Haefele


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