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Improving the fridge

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jeb View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote jeb Quote  Post ReplyReply Direct Link To This Post Topic: Improving the fridge
    Posted: 28 November 2018 at 16:08

I have planning to improve the fridge on my Hanse 400 for several years and after the extremely hot Swedish summer I finally started.

My plan was to add extra insulation and buying a water-cooled Isotherm unit.

 

Im now in the mid of the project. I made openings in the cupboard aft of the fridge as well as from the saloon side. Im now able to access 3 sides and are adding 40-50mm of blue Styrofoam.

With the fridge exposed I was also able to detect voids in the original insulation, about 20 mm from the joint and down was not filled so I fixed that with expanding foam. I was also able to glue 50 mm of insulation below the fridge.

If needed I will add 20 mm of insulation on the inside the fridges left side where there is no access from the outside.

 

When ready, there will be 4 major improvements.

         Fixed the original insulation

         Adding 40-50mm insulation giving a total of 100-110mm

         Removing the heat source (compressor) behind/below the bottle area

         Water cooling

Insulation almost done on the saloon side

Big hole in the locker between stowe and fridge, insulation behind teh fridge visible.

 

Insulation test fitted, will be trimmed to 45mm and covered with white pvc. All scratches will be hided by the pvc and the shelfs/drawers.


Edited by jeb - 28 November 2018 at 16:13
Jesper
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toholthe View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toholthe Quote  Post ReplyReply Direct Link To This Post Posted: 28 November 2018 at 22:11
I am adding a small fan in the fridge to get better air flow inside. In my Hanse 400 from 2007 the evaporator is rally cold, but inside the door is not cold at all. Plan is to connect fan to lamp in fridge.

I will use this fan:
https://www.ebay.com/itm/DC-12V-50mm-Blower-Cooling-Fan-Hotend-Extruder-Turbine-Fan-for-3D-Printer-UK-LLD/173573926072?hash=item2869cfecb8:g:SkgAAOSwQIFbuBJJ

Plan is to mount it in the roof of the fridge over the door blowing towards the evaporator.
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jeb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeb Quote  Post ReplyReply Direct Link To This Post Posted: 29 November 2018 at 08:37

Thanks for the tip,

My main concern has been the current consumption due to the fact that the compressor is running almost constant. I have already installed the Smart Energy Control from Isotherm and that unit measures the temperature in the box and not at the evaporator as the original thermostat, so temperature close to the door is not a problem.  But I will consider adding a fan and try to wire it so it turns off when the box is opened (to avoid blowing in hot air).

Jesper
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Mary400e View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mary400e Quote  Post ReplyReply Direct Link To This Post Posted: 29 November 2018 at 10:38
Hi Jesper
I have a plan for the winter to do improvement regarding the fridge.
A couple years ago did I made a lot of large holes in the wooden plate covering the compressor, and have removed the small cupboard door to improve the ventilation. This have improved a lot, but more is needed. Can you provide more details about the component used. Thanks.
 
BR Jesper B (from DK)
Hanse 400e (Tiramisu) from 2007
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Borjebus View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Borjebus Quote  Post ReplyReply Direct Link To This Post Posted: 29 November 2018 at 14:44
Hi Jeb,
Where do you plan to locate the compressor when you move it?
BSK, Hanse 370e #82, 2006
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jeb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeb Quote  Post ReplyReply Direct Link To This Post Posted: 29 November 2018 at 21:22
It's not that sensitive where to locate a water cooled unit. I will use the isotherm sp2351. The evaporator is the same size as the old one. I will mount the compressor under the removable part of the u-sofa in front of the sink. I will add more pictures when I have made more progress.

@jesper B, that's my name as well! I used same strategy as you, removed the wooden cover and kept the door open but that was not sufficient.

As insulation I'm using blue EPS. Behind the fridge I had to make 4 pieces and glue them together. Below under the plywood supporting the box I had to use 3 pieces to be able to slide them in. I have removed the removable aft part of the sofa, was only fixed with 4 screws. I was cutting away as much as possible of the plywood without removing the big part of the sofa but I did not get access to the complete front of the fridge so I had to make a puzzle of several pieces that was glued together while slided in. The most complicated part was to gain acces to the front from inside the cupboard. It was actually 2 pieces of plywood with some wooden pieces between, total thickness of about 50 mm (48 to be exact). Before doing the cutting I had to remove the shelfs. All small gaps between EPS parts and other voids have beed filled with foam for outdoor use.

Edited by jeb - 29 November 2018 at 21:26
Jesper
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeb Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 18 minutes ago at 18:02
Some updates from my fridge project. All sides except the left side (the one facing the sink cabinet) has now got an additional 50 mm EPS. If needed I might add 20mm + pvc skin on the inside of the uninsulated side. I have installed the SP2351. On picture 1 is the water cooled sp thrue hull. I had to make some space for the pipes in the front wall of the sink cabinet using my router. A semilar cutout was made in the removable part of the sofa.
I changed the plan for the compressor and mounted it in the storage below the sofa (removable part still not mounted)

The bulkheads and front part of U-sofa refitted. 


The inside wall of the cupboard with 3 mm pvc glued to the insulation. I will make a cover in the corner as well. I added some wooden pieces behind the pvc where all fittings are.


Last picture is from where the compressor use to be. Now with proper insulation and no heat source. Still some cleaning left.

The remaining task is to finalize my arduino based controller, but I will return to that in a later post. As a teaser I Will meassure and control both freezer compartment and the fridge itself. The unit will also talk to my battery monitor to determine when to run cool down, or turn off. Rpm of the compressor will be controlled as well as an internal fan and if needed an extra fan in the compressor compartment.


Over and out!
/Jesper


Edited by jeb - 21 hours 11 minutes ago at 18:09
Jesper
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toholthe Quote  Post ReplyReply Direct Link To This Post Posted: 16 hours 31 minutes ago at 22:49
Great work Jesper. I am finished adding fan inside fridge. Mounted above the door in the roof with a relay that will keep the fan on when lid is closed. Hopefully this will give more even temp in fridge. With new LiFePo batteries I am hoping to skip further action and just accept that fridge uses some more power than Jespers fridge. 











Edited by toholthe - 16 hours 28 minutes ago at 22:52
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