|Topic Review (Newest First)|
|05-22-2008 02:12 PM|
We all can't do work like Halekai...
|05-22-2008 11:55 AM|
Originally Posted by CatalinaFan View Post
|05-22-2008 11:32 AM|
Another refrigerator upgrade
Here is an article from another Catalina owner on the same thing.
Refrigeration Upgrade | C36 International Association
|05-22-2008 11:00 AM|
Originally Posted by JohnRPollard View Post
I cannot remember if it is the same setup of not. I am pretty sure it has a front door. Regarding your setup, it really wouldnot be any different. The only exception is that you have to divide your box vertically instead of horizontally. It would actually be more efficient that way too.
The new Catalinas (on many models, like the 350 IIRC) have a freezer box on one side (with evaporator in there) along with adjustable holes to connect it to another box which acts as the fridge.
I bet you could make yours work the same.
I will see what I can do about some pics.
|05-21-2008 08:40 PM|
I'd love to see photos. Sounds interesting
|05-21-2008 06:13 PM|
Nice upgrade. Well done!!
Of course, it helps that you have a front loader, i.e. a swing open door on the fridge. That's not the most common arrangement -- ours is strictly top access. But maybe I could find some way to create a second "trap door" at the bottom of an upper fridge compartment. All I'm looking for is the ability to make ice cubes for soft drinks, first aid, etc...
P.S. Do you know whether the fridge arrangement on the Catalina 42 is similar to yours, i.e. does it not have a separate freezer compartment inside the ice box?
|05-21-2008 05:18 PM|
|sailingdog||Of course, using a freshwater tank as the heat sump for a refrigerator isn't the best idea in the world, since the heat capacity is related to the volume in the tank and the ambient temperature. In hotter climates, where the refrigerator would be working harder, you'd also have a less efficient heat sink, since the water in the tank is hotter to begin with, and that is compounded by the fact that you probably use more water in hotter climates... so as the need for increased heat sink capacity rises, the actual heat sink capacity will probably decrease.|
|05-21-2008 04:53 PM|
|Wayne25||Yes, lots of variables, like does the water start out at 90* if your in southern waters or 50* if your in northern. I also have no idea of the BTU capacity of the frig. Obviously more BTU would heat up the water faster. Just wanted to point out that there is a limit to the 100 gal heat sink. That limit being the point at which the frig turns off on a temperature limit switch. And probably at the worst time possible.|
|05-21-2008 04:44 PM|
Thanks Wayne, I don't have anywhere near your on knowledge of the physics, but I would love to understand this better.
Do I understand the sum of your calculations is the water in the tank would rise .6 degrees every hour the compressor ran? Obviously that is assuming the tank is full, which it won't be most of the time, and that the tank contents are cycled through the heat exchanger once an hour.
This doesn't seem too bad to me if the compressor only runs 3-4 hours a day, I realize 3-4 hours per day is an "if" and assumes a well insulated box. If the tank was on average half full (50 gallons) you would rise the water temp 1.2 degrees per hour or 3.6-4.8 degrees per day. wouldn't the tank cool back off enough in the idle time? Is it that a sealed tank with a small temp difference to ambient temp won't loose it's heat quickly?
I'm not being argumentative, I'm just trying to comprehend this better.
CD, this seems on topic to me but please let me know if you consider this a high jack of your thread and I'll create another one.
|05-21-2008 03:41 PM|
So if I remember this formula correctly, #water x temp rise = BTU
500 BTU / (100 gal) (8.34#per gal)=.6 degrees per pass or per hour. I'm guessing at the BTU of the Frig. Either way he will have a hot water tank and make the refig go out on limit switch.
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