Hello there,
Anyone here have one of these things?
These are 'refrigerators' that are made with a thermoelectric cooling device (TCD or TEC).
The TCD takes an electrical current and creates a temperature differential on it's two different sides, then the hot side is cooled with a fan and the cold side is used to cool the inside of the refrigerator compartment thus cooling whatever is inside. They run off of 12vdc so they work in the car too, and have an adapter that converts 120vac to 12vdc so they can run in the house too.
The question is not if they work, but how well they work. Most of the reviews i read on the web suggest that they dont get cold enough, and they take a long time to cool water down.
The typical size is small, which is not bad in itself though. They typically hold 6 cans of 12 ounces each. That means 6 cans of soda or beer will fit inside. That's ok really, and they do make bigger ones.
What i would hope to see is a temperature measurement of the inside after say 12 hours run time on 120vac. That could be with one can, two cans, three cans, etc., up to the six can capacity. There must be at lease one can or similar inside that was at room temperature to start.
The TCD's typically take about 6 amps at 12 volts, which is 72 watts. I have read that the heat movement efficiency is max of about 15 percent, which puts it at 10.8 watts which i will approximate as 10 watts to keep this simple.
Now it takes about 500 watts to heat an 8 oz cup of water from about 20C to about 100C in about 2.5 minutes. Since we only have 10 watts cooling power to work with, that means it would take about 2 hours to cool 8 oz of water from 100C to 20C, but it's a little different when cooling because the cooling surface cant get any lower than 80 deg C lower than it's hot side surface. That means the cooling is probably exponential in that the lower the temperature inside gets the longer it takes to get cooler by 1 deg C. So it may go from 20 deg C down to 19 deg C in a minute or two, but then take much longer to go from 10 deg C to 9 deg C for example.
So without calculating all this, i was hoping someone would have one and can offer some info on how well it works for cooling things like soda or beer or even say sliced ham or something like that. This would tell me if one would work in the application i have planned for it.
Thanks.
Anyone here have one of these things?
These are 'refrigerators' that are made with a thermoelectric cooling device (TCD or TEC).
The TCD takes an electrical current and creates a temperature differential on it's two different sides, then the hot side is cooled with a fan and the cold side is used to cool the inside of the refrigerator compartment thus cooling whatever is inside. They run off of 12vdc so they work in the car too, and have an adapter that converts 120vac to 12vdc so they can run in the house too.
The question is not if they work, but how well they work. Most of the reviews i read on the web suggest that they dont get cold enough, and they take a long time to cool water down.
The typical size is small, which is not bad in itself though. They typically hold 6 cans of 12 ounces each. That means 6 cans of soda or beer will fit inside. That's ok really, and they do make bigger ones.
What i would hope to see is a temperature measurement of the inside after say 12 hours run time on 120vac. That could be with one can, two cans, three cans, etc., up to the six can capacity. There must be at lease one can or similar inside that was at room temperature to start.
The TCD's typically take about 6 amps at 12 volts, which is 72 watts. I have read that the heat movement efficiency is max of about 15 percent, which puts it at 10.8 watts which i will approximate as 10 watts to keep this simple.
Now it takes about 500 watts to heat an 8 oz cup of water from about 20C to about 100C in about 2.5 minutes. Since we only have 10 watts cooling power to work with, that means it would take about 2 hours to cool 8 oz of water from 100C to 20C, but it's a little different when cooling because the cooling surface cant get any lower than 80 deg C lower than it's hot side surface. That means the cooling is probably exponential in that the lower the temperature inside gets the longer it takes to get cooler by 1 deg C. So it may go from 20 deg C down to 19 deg C in a minute or two, but then take much longer to go from 10 deg C to 9 deg C for example.
So without calculating all this, i was hoping someone would have one and can offer some info on how well it works for cooling things like soda or beer or even say sliced ham or something like that. This would tell me if one would work in the application i have planned for it.
Thanks.