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Old 17-08-2012, 13:04   #31
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Hi Giovanni,

If I would build it today, I would do it exactly the same. The energy consumption is dependent on box volume, insulation, weather conditions and on how much warm stuff is put in to cool, NOT on which model Frigoboat. Choose the Frigoboat components on alculated maximum cooling needed and switch to bigger unit when the math shows close to max. With smaller unit. For example: the BD50 has 5 speeds and will be better efficiency on low speed than a BD35 maxed out.

ciao!
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Old 17-08-2012, 19:41   #32
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Re: Constructing New Fridge / Freezer Boxes

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Originally Posted by s/v Jedi View Post
Hi Giovanni,

If I would build it today, I would do it exactly the same. The energy consumption is dependent on box volume, insulation, weather conditions and on how much warm stuff is put in to cool, NOT on which model Frigoboat. Choose the Frigoboat components on alculated maximum cooling needed and switch to bigger unit when the math shows close to max. With smaller unit. For example: the BD50 has 5 speeds and will be better efficiency on low speed than a BD35 maxed out.

ciao!
Nick.
Hi Nick
Good to hear from you and thanks for the feedback. I think my boxes sizes are on the borderline between the BD50 and BD35 compressors or F160 or F200 evaporators and either could work. In the attached links there is a test that that shows that the BD35 could be a better choice. The BD50 has 25% greater capacity but it comes with a 40% increase in consumption.
I'll wait till the Italian Frigoboat are back from the holidays and see what they say. By the way, which evaporators did you use? I can't make it out from the pics.
How is your system doing when it comes to evaporator frosting? How often do you defrost in the tropics?
Here in Malaysia my home fridge needs defrosting every few days which is a major PIA. The ice in on the evaporator insulate it and it keeps the compressor going all the time.
I am thinking of installing a foil heater in the space between the evaporator and the box wall. Frigoboat has a thermostat with defrost function that can control it.
I have worked on walk in large refrigeration plants and they all have defrosting system. Without it the plants don't work well and it is impossible to reach very low temps (-20 or lower)
In my case the energy loss for defrosting is not a problem as at mid day I will have plenty of spare energy from solar. Even if I did not I could defrost any time I motor.
I don't understand why Frigoboat or others don't offer defrosting kits.
Cheers
Giovanni

http://www.veco-na.com/images/Fridge...eb_reprint.pdf
http://www.veco-na.com/images/Green_...ge_edition.pdf
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Old 17-08-2012, 22:01   #33
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Re: Constructing New Fridge / Freezer Boxes

I use a 1500 watt heat gun. It only takes a minute or two.
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Old 17-08-2012, 22:23   #34
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Re: Constructing New Fridge / Freezer Boxes

Yes, that is a simple way to go about it and the gun can be handy for other uses. The drawback is that you have to empty/refill the cell every time. Where do you sail and how often do you need to defrost? The frequency of defrost is key. I would not mind using the gun once a month but if I need to do it every 3 days then it would be a pain.
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Old 18-08-2012, 11:26   #35
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Re: Constructing New Fridge / Freezer Boxes

When we were in Mexico (different boat with a cold plate) we defrosted about once a month.
This boat has an evaporator plate and we went almost a month in the Canadian Gulf Islands and Jervis inlet. Daily temps were in the mid 80's.
Fridge worked wonderfully after the Aerogel rebuild. Freezer near zero f. (held ice cream rock hard) and box about 40 F. It used about 30aH daily.
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Old 18-08-2012, 18:44   #36
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Re: Constructing New Fridge / Freezer Boxes

I guess in the tropics with a plate evaporator defrosting should be done every one or two weeks. I guess I could defrost with a heat gun and move the food from one cell to the other. I may build a gutter under the plate evaporator so I can direct and collect the water in some kind of collecting pot. Still, I wish they made they made a defrosting upgrade kit.
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Old 12-11-2013, 08:07   #37
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Re: Constructing New Fridge / Freezer Boxes

Vacuum Panels have dropped in price making them a more viable option . http://www.sealedair.com/ Custom sizes , $10 to $15 a square foot . They do have a minimum order of $1000

At that price I can do my fridge and freezer . With spares.

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Old 13-11-2013, 01:36   #38
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Re: Constructing New Fridge / Freezer Boxes

Hi Guys, good thread about a really important issue for cruisers! For my 2c I'd really recomend for the tropics a water cooled system. Perferably a fresh water cooled system like these Here. There is a bit about my experience with them on the link on that page. Briefly though, we have a very large fridge and freezer (290ltrs each) and ONE of these units cooled BOTH cabinets. Yes, one can do both fridge and freezer! We had Ice Cream on the equator, and without a genset or huge solar panels. It really is a great system!
Nice Job on your build Nick!
Cheers
Matt
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Old 13-11-2013, 01:56   #39
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Re: Constructing New Fridge / Freezer Boxes

Matt,

what do you do to fresh water cool the ozfridge unit.

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Old 13-11-2013, 02:08   #40
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The unit has a small heat exchanger built in. So it takes water from the fresh water tank, runs it thru the heat exchanger, and puts it back in the tank. No thru hulls, no corrosion issues, really simple. Because water is a much more efficient heat sink than air, the water temp in the tank rises hardly at all. In our case less than 1 deg c.
I really can't praise these units enough!
Matt
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