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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: 05 June 2018 at 19:19
I don't know if all Hanse 342s look the same but this is how it looks on mine. (The outside of the cooling box looks wet because I sprayed it with water to prepare for foam to be sprayed.)



The way I made sure I could spray foam into a confined space was to put pieces of extruded polystyren in the opening. It looks like this:



Johan

Edited by Johan Hackman - 11 June 2018 at 06:18
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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 19:21
Originally posted by Gregor Gregor wrote:

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


I don't. That's why I practised with the foam in my garden so I would get a good idea of how it will react when I do it in the real situation.

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: 10 June 2018 at 19:45
The task to insulate the fridge is now in its final stages.

I have sprayed foam around the box on all sides. There has however not been possible to spray under the box, which is the most important place as cold wanders downwards.

I have solved this by cutting a 50 mm thick piece of extruded polystyrene to put at the bottom of the box, from the inside. I was considering putting two layers but thought 100 mm less from the bottom of the box would make the box too small.

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: 10 June 2018 at 19:49
I have finished the job by putting a piece of aluminium at the bottom of the box and on the sides to cover the holes that I made to spray foam. Now I only have to do some polishing and put the lid back. I will also try to find a new spring for the lid as the old one seems have lost some of its former tension.

Johan



Edited by Johan Hackman - 11 June 2018 at 06:19
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Gregor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gregor Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2018 at 19:46
Johan,

Does your boat have the pretty thin cover plate? I’ve written a few blog posts when I rebuild my fridge. In Dutch....https://www.uisge-beatha.eu/logboek/398/Verbouwing-koelbox-1
Uisge Beatha

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

http://www.uisge-beatha.eu
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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: 28 June 2018 at 22:09
Gregor, I have looked at that particular part of your site many times to get ideas how to insulate my own box. However, my boat is different and not as accessible as yours. I wanted to open up much more to get access but it was not possible so I choose to spray the foam from holes that I had drilled from inside the box.

And yes, the cover is very thin but as cold air is heavy I don't think that the leakage is through the top. If you put your hand on it it is cold though, so maybe there is a leakage after all. What were you thinking?

Johan
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gregor Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2018 at 06:02
Johan,

We had to remove the kitchen blade to make it accessible Tongue

The cover of my Dehler wasn't well insulated too, so I split the cover in a horizontal way, put tape around the closing part, measured the space between the lower and upper part, put holders in place and sikaflex between the two layers, som wheight on top of it. By the time it was dry, I knew the cover would close as much as possible.

The cover in certain Hanse-series is very poorly designed. However it would be more or less a waist of your work if the cover remains a problem.

Having said this, just take note of the time your home fridge is running when cooling....
Uisge Beatha

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

http://www.uisge-beatha.eu
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Martin&Rene Quote  Post ReplyReply Direct Link To This Post Posted: 08 July 2018 at 21:58
I never had the nerve to do the full job as Skipper detailed, but did insulate the box with pieces of closed cell foam.

I had also improved the performance of the compressor by installing a fan.

http://www.myhanse.com/fridge-comprressor-cooling_topic7850_post61459.html?KW=compressor#61459

So my final thought was to reduce the heat loss through the fridge lid, in particular through the metal surrounds of the hatch and its cover.

I made a cover from cork tiles.  The top layer is from 4 cork tiles.  The bottom layer is 4 cork tiles, cut into 1 full one, 4 half tiles and 4 quarter tiles and the 2 layers stuck together with staggered joints.



Having cut the cover to the right shape, the second photo shows the underside.  I have glued on a small raised section that just fits outside the shape of the fridge metal edging, so that the cover does not rest directly onto the fridge lid.




Do not ask me how good it is, but when the sun is shining through the hatch cover onto the fridge (as it has a lot in Scotland this year), it must be doing something.   It is also useful, if you put down a hot pan.
Martin&Rene Hanse 341 Dipper Wheel steering, 3 cabin layout & shallow keel, normally based in Scotland
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