Large heatsinks in refrigerator?

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SUMMARY

This discussion centers on the effectiveness of using large aluminum heatsinks versus water jugs to maintain refrigerator temperature when the door is left open. It is established that water has a heat capacity four times greater than aluminum, making it a more effective thermal mass for stabilizing temperature. Positioning heatsinks in the front of the refrigerator may not yield the same benefits as water jugs placed in the back, as cold air rapidly escapes and warm air enters. The consensus is that a full refrigerator is more energy-efficient, as it minimizes the volume of cooled air lost during door openings.

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  • Understanding of heat capacity and thermal mass
  • Basic knowledge of refrigerator operation and airflow dynamics
  • Familiarity with materials science, specifically properties of aluminum and water
  • Awareness of energy efficiency principles in refrigeration
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  • Research the thermal properties of materials, focusing on heat capacity comparisons
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  • Learn about airflow dynamics within refrigerators and their impact on cooling
  • Investigate alternative methods for maintaining refrigerator temperature during door openings
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This discussion is beneficial for homeowners, appliance engineers, and energy efficiency advocates interested in optimizing refrigerator performance and understanding thermal dynamics in household appliances.

djdoug99
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I'm trying to keep my refrigerator cold when I have the door open and have read about putting water jugs in the back to help stabilize the temperature when the door is left ajar. Instead of water, would large aluminum heatsinks (with fins) work just as well?

Thanks

Don
 
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Compare the heat capacities.
 
Water has a heat capacity 4 times that of aluminum, but If I can position the heat sinks in the front of the refrigerator (closer to the incoming warm air), will that be just as effective as water jugs in the back?
 
Wasn't talking about specific heats. The point was to compare volume of non-useable space in the fridge. Cold air is going to be falling from the fridge quite rapidly and being replaced by warm air. The more cold "mass" present in the space, the quicker the recovery when you close the door. As far as cooling the incoming air on the way in, why worry about it?
 
I don't really understand what you are trying to do. A jug of water sitting behind your fridge doesn't really do anything except maybe block airflow. And a heatsink -- is it connected to anything? And leaving the fridge open -- are you trying to destroy it while providing cumbersome heating to the room it is in?

This really makes no sense.
 
russ_watters said:
I don't really understand what you are trying to do. A jug of water sitting behind your fridge doesn't really do anything except maybe block airflow. And a heatsink -- is it connected to anything? And leaving the fridge open -- are you trying to destroy it while providing cumbersome heating to the room it is in?

This really makes no sense.

Sitting in the back of the fridge, not behind it.
Having a full fridge reduces the power usage. When the fridge is opened the volume of cooled air escaping is much less than if the fridge was empty.
I put water bottles in as they're useful, unlike Al blocks. Although, I bet I'd get more power savings from thinking about what I'd like to eat/drink before staring into the fridge blankly..
 

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