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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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  #1  
Old 07-03-2013, 09:20 PM
vinny8765 vinny8765 is offline
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Default Black and Decker 1.7Cu-Ft Mini Fridge

Model # BNA17B
115V 60Hz
1.6A
130W
Motherboard?: PCB90425K2

The problem I have with this is fridge is that it gets my room way too hot. It uses dual Peltier thermal-electric cooling modules for it's primary source of cooling. It works but it's not very efficient as we all know. I was wondering if I could swap out the 90mm fans for something else such as a delta fan, but my concern is that the stock fans are operating at 12v .16A and a delta fan would draw much more amps than that. So would it be alright if I switched the stock fans to one of these? And if any, what modifications would I have to do? I would also like to be able to just replace that board with a PSU from a computer.

http://www.newegg.com/Product/Produc...82E16835132021
http://www.newegg.com/Product/Produc...82E16835705013

Last edited by vinny8765; 07-03-2013 at 09:35 PM.
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Old 07-03-2013, 11:32 PM
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blueroomelectronics blueroomelectronics is offline
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You need to keep those Peltiers cool or they lose their efficiency and could also be damaged from overheating.

Remember you don't make cold, you remove heat.
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Old 07-04-2013, 12:26 AM
vinny8765 vinny8765 is offline
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Yeah I gotcha:P But my main objective is to remove and dissipate the heat with better fans(higher rpms and higher cfm) but since they draw more power, I was wondering if it was okay if I added fans with higher amperage requirements.
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Old 07-04-2013, 12:47 AM
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It seems you are asking if the "motherboard" can power bigger fans. We can't tell from here, but you can use a relay. Have the motherboard run a relay and have the relay run the fans.
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Old 07-04-2013, 12:56 AM
vinny8765 vinny8765 is offline
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That's a good idea. Although I've never worked with relays, it's worth a shot!
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Old 07-04-2013, 01:44 AM
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Kermit2 Kermit2 is offline
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Quote:
Originally Posted by vinny8765 View Post
Model # BNA17B
115V 60Hz
1.6A
130W
Motherboard?: PCB90425K2

The problem I have with this is fridge is that it gets my room way too hot....
If your real problem is what you stated above, the addition of fans will only change the rate at which you heat the room. The overall energy being added to the room will stay pretty much the same. A small additional amount of heat will be added to the total from the higher wattage fans you use.

Only by bringing in cooler air will you succeed in lowering the overall temperature of the room.
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Old 07-04-2013, 02:07 AM
vinny8765 vinny8765 is offline
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Ah okay. Any ideas on how I would accomplish this?
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Old 07-04-2013, 03:01 AM
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Create a loop of outdoor air to be used by the fans.
Problem: Heat generated stays indoors.
Solution: Put it outdoors.
A tiny cooler like that might work with 4 inch clothes dryer tubing. Outdoor air comes in, gets hotter, goes back outdoors.
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Old 07-04-2013, 03:22 AM
vinny8765 vinny8765 is offline
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That's a good idea, although it gets quite warm here in Texas. Not sure if the air would be cooler from outside. Maybe I should relocate to somewhere further up north. That would fix the problem.

Last edited by vinny8765; 07-04-2013 at 03:29 AM.
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Old 07-04-2013, 03:58 AM
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Put the heat sinks & fans outside the window, the fridge stays inside. Air Conditioning works like this.
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