- #1
jamescam
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- TL;DR Summary
- Trying to make mini a/c. Peltier cold site is getting colder but when I attach heat sink to cold side then cold is not transferred to heat sink.
Hi guys
I am not certified engineer but I watched many videos to make home based mini air conditioners using Peltier module. So I decided to try this as experiment.
My plan is if this small test project works well then I will proper mini a/c (for my small 10x10 feet office or at least for my office table) using 2-3 Peltier modules with radiator method instead of heatsink and fan for hot side.
What I did is, I made approximately 1 foot long and 8 inch wide and 6 inch high box with help of chip boards and extra unused stuff available at home. This box is divided into 2 parts. Both parts are separated by chip board so hot air from hot side heat sink don't flow into cold side area.
Peltier Module: TEC1-12706 (6 Amp)
Box Back side: Used computer power supply 12 volt 16 amp (16 amp in case I add one more Peltier module so same supply works fine) + TEC1-12706 Peltier Module + heat sink for hot side + 12 volt fan to exhaust heat out of box.
Box Front side: Only Cold side of Peltier module is visible in this front box + heat sink attached to extract cold from Peltier module surface. I attached one 4" x 4" 12 volt fan on front of this box to throw cold air out of box.
Its very simple I join Peltier module + hot side fan with power supply and Peltier module is working fine. Back hot side heat sink is getting hotter and fan is throwing heat out of box.
And other cold side of Peltier module is cold. I checked with digital temperature meter and temperature on Peltier module cold surface was less than 20 degree. Front box where cold side is attached is almost 8" x 6".
I put coin on Peltier module and in just just 10 minutes ice was started making on Peltier module.
But the problem is when I attach heat sink and turn on front fan then fan is not throwing cold air out of box. Although Peltier module surface is cold but heat sink attached to cold side is not getting colder.
So please help me to figure out why cold is not transferred from Peltier module surface to heat sink. I assume once heat sink is cold then fan can throw cold air out of box.
I did one more thing, I put one 3" x 3" fan on cold side heat sink that was throwing air on heat sink (getting air from front outside and throwing on heat sink) and I put digital temperature pointer in heat sink fin and temperature dropped just 1-2 degree and then stopped. So it did not work.
Another thing, since I am totally new to this so when I buy Peltier module then shop keeper gave me standard heatsink paste. (white color). Is there any kind of special heat sink paste or grease for this purpose. Is this grease or paste issue that's stopping cold from being transferred from Peltier module surface to heat sink.
Or there is any special heatsink for cold side or this purpose?
So please help me to figure it how to fix this.
If this mini project is successful I mean a small 8" x 6" front side box is cold then I planned to make proper a/c with 2-3 Peltier modules using Radiator to take off hot side heat.
Help me please.
James
I am not certified engineer but I watched many videos to make home based mini air conditioners using Peltier module. So I decided to try this as experiment.
My plan is if this small test project works well then I will proper mini a/c (for my small 10x10 feet office or at least for my office table) using 2-3 Peltier modules with radiator method instead of heatsink and fan for hot side.
What I did is, I made approximately 1 foot long and 8 inch wide and 6 inch high box with help of chip boards and extra unused stuff available at home. This box is divided into 2 parts. Both parts are separated by chip board so hot air from hot side heat sink don't flow into cold side area.
Peltier Module: TEC1-12706 (6 Amp)
Box Back side: Used computer power supply 12 volt 16 amp (16 amp in case I add one more Peltier module so same supply works fine) + TEC1-12706 Peltier Module + heat sink for hot side + 12 volt fan to exhaust heat out of box.
Box Front side: Only Cold side of Peltier module is visible in this front box + heat sink attached to extract cold from Peltier module surface. I attached one 4" x 4" 12 volt fan on front of this box to throw cold air out of box.
Its very simple I join Peltier module + hot side fan with power supply and Peltier module is working fine. Back hot side heat sink is getting hotter and fan is throwing heat out of box.
And other cold side of Peltier module is cold. I checked with digital temperature meter and temperature on Peltier module cold surface was less than 20 degree. Front box where cold side is attached is almost 8" x 6".
I put coin on Peltier module and in just just 10 minutes ice was started making on Peltier module.
But the problem is when I attach heat sink and turn on front fan then fan is not throwing cold air out of box. Although Peltier module surface is cold but heat sink attached to cold side is not getting colder.
So please help me to figure out why cold is not transferred from Peltier module surface to heat sink. I assume once heat sink is cold then fan can throw cold air out of box.
I did one more thing, I put one 3" x 3" fan on cold side heat sink that was throwing air on heat sink (getting air from front outside and throwing on heat sink) and I put digital temperature pointer in heat sink fin and temperature dropped just 1-2 degree and then stopped. So it did not work.
Another thing, since I am totally new to this so when I buy Peltier module then shop keeper gave me standard heatsink paste. (white color). Is there any kind of special heat sink paste or grease for this purpose. Is this grease or paste issue that's stopping cold from being transferred from Peltier module surface to heat sink.
Or there is any special heatsink for cold side or this purpose?
So please help me to figure it how to fix this.
If this mini project is successful I mean a small 8" x 6" front side box is cold then I planned to make proper a/c with 2-3 Peltier modules using Radiator to take off hot side heat.
Help me please.
James