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Reduce compressor running time with up to 50%

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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2018 at 21:01
Samuel, I value your input. I filled the box to the top, and as you can see, the expanded foam ended up outside of the box. The result would probably be much better if just the amount of foam was sprayed that would fit the desired space in its expanded form. Then it would probably cure much better.

The instructions for my foam says that a bit of sprayed water would be good but I think the intention is to get better adherence to the the surrounding surfaces.

There is also a paper bag (grill briquettes) in my picture that I just partly filled with foam and the result came out nice, but then again, if I would have wanted to fill the whole bag I used to little foam.

I guess you know what I mean by "practice". Before I go into spraying around my fridge box I will try it a few more times in my garden, like above.

Johan
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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2018 at 21:05
Originally posted by Weak Moment Weak Moment wrote:


Thanks for bringing this up - I need to do the same for my 371.  Perhaps more needed here in South Florida than in the archipeligo.  To give you an example of why the insulation is needed, with an ambient air temperature of +25, half way up the inside of the box the temperature is +13, while the bottom of the box is at -3.
 
 


The same with my box, the temperature varies a lot with the height. However, my main concern is electric consumption. I think the fridge is the number one power thief on my boat.

Johan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote skipper Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2018 at 22:14
Hi guys,

you can do it the right way or the quick and dirty, it is your call.

I used 2 component PU foam to prevent the foam to capture humudity over the years and also to be sure that the foam is cured "instantly" (no expansion afterwards).

The technique/method I used was "stolen" from a company in Gothenburg.


//Stefan


Edited by skipper - 11 May 2018 at 22:16
Cheers,
Skipper
Hanse 342 2005 (Sparcraft mast, white hull, wheel steering, deep draft keel, short rudder)
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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 2018 at 08:53
Originally posted by skipper skipper wrote:

...you can do it the right way or the quick and dirty, it is your call.


I might be quick and dirty. Or perhaps not quick as I have been wanting to insulate my fridge for years but haven't yet got around to do it, mainly because I have found the procedure to be scaringly difficult.

I am planning to put one or two layers of extruded polystyrene at the bottom of the box (i.e. 50 or 100 mm) in order to insulate downwards and at the same time avoiding to put foam under the box where for instance the heater tube is located. I will cover it with an aluminium plate.

Johan
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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 22 May 2018 at 08:59
Originally posted by samuel samuel wrote:

If you look closely you may find that the foam in the centre has not cured properly. ( the box on the left shows some shading in the central area, other pieces are whiter)This is sometimes due to insufficient moisture to cure it & too much initially placed  the area to be filled.



I have gone on experimenting with the foam and have discovered that sometimes the foam does not cure as well as it did the first time (when Samuel pointed out that not even then was it fully cured). I also found big air compartments when cutting the foam. Trying to spray some water before spraying the foam seems to solve this so I am grateful for the advice.

I will practice some more before I cut holes from inside my cooling box and spray foam to insulate it. The big problem with spraying the actual box is that you cannot see what you are doing nor can you inspect the result.

Johan
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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2018 at 15:15
The experimentation in its final stages in this picture. I found out that spraying water is essential to get a well cured foam so I got a small spray bottle. I thank you again for that piece of advice, Samuel!

Someone also to told me to be careful not to let the forces of the expanding foam indent the walls of the fridge and I therefore filled a gloss bottle with foam but concluded that the forces won't be that strong.

Johan


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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2018 at 15:24
And now the works on the fridge has commenced!

I begin with filling the space between the back of the box and the hull with foam. As there is a gap between the plywood the box stands on and the hull I began with drilling two holes at the bottom of the box. I then put a plastic shopping bag on the inside and filled it with foam. This way I could bar the gap without filling the space under the fridge with foam. I will put a sheet of extruded polystyrene at the bottom of the fridge which will both cover the two holes and insulate the fridge downwards.

You can also see a hole that I have drilled behind the cooling plate. After the bar below had cured I sprayed foam into that hole.

Johan


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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2018 at 15:26
I was interested to see that the walls of the box are approximately 22 mm thick.

Johan

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Johan Hackman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Johan Hackman Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2018 at 19:14
I hope the topic starter does not mind that I post a few more pictures of the progress of insulating my fridge. I just want to contribute to the this excellent thread the way I can.


Here is a picture of one hole used to fill the space behind with foam next to a hole yet to be used. The excess foam from the first hole has been cut off with a knife. Both holes will be covered with an aluminium plate according to my plan.

Johan

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gregor Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2018 at 19:17
Nice job Mr. Hackman. 

How do you know if your foam has covered the whole box?
Uisge Beatha

Currently sailing Dehler 36 JV (2002)
Previous boat: Hanse 311 #80

http://www.uisge-beatha.eu
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