The Refrigerator
One day, Dr. Nova arrived in a laboratory to find that his technician had left the refrigerator's door open.
When he pointed this out, that man coolly replied, "It was such a hot day and I wanted to lower the temperature of the room a bit."
Dr. Nova was amused. Why ?
When he pointed this out, that man coolly replied, "It was such a hot day and I wanted to lower the temperature of the room a bit."
Dr. Nova was amused. Why ?
Labels: funphysics, thinktank
posted by Rajesh Lal at
2:36 AM
27 Comments:
Something to do with conservation of energy - warm air rising from the back of the fridge compensates for the cold air coming out the front.
Then you have the extra heat created by the operation of the refigeration motor itself, so the overall effect would be to increase the heat of the room, if only slightly
I think he was amused because the aircon could have been switched on to cool the room - labs usally have these.
I think he was amused because the aircon could have been switched on to cool the room - labs usally have these.
He was amused that he had hired such an idiot as a technician..
However, leaving the fridge door open could therotically lower the room temp in the short term.
Because the room temp with the fridge door closed already takes into account he heat of the coil in back + motor heat. If the fridge is big enough, opening the door will allow some cold air into the room. But once the room temp equalized again, it would not be able to maintain the cooler temperature.
he was sitting in the frigde?
Because the heat of the room would take over the coldness of the fridge. The fridge would cool down to be the same temperature of the room.
Second Law of Thermodynamics...enthropy is always increasing.
The refrigerator's net heat output is always greater than the net cooling it provides.
So, if the technician run's the refrigerator - even with the door open - the room is actually being heated by the refrigerator.
Because, although the fridge was off, and the room was getting colder.
the technician told a joke
LOL
OWNED
This post has been removed by a blog administrator.
He laughed, because it was 42(F) degrees outside. If it was to hot, then the Tech should have opened a window, or turned down the heater.
42 again
because the technician farted right after he spoke
Because Dr. Nova never had a fridge
Pwned all
because of all the THC
He was amused because the tech had a rational response for forgetting to close the refrigerator.... wow this is a lame post....
Assuming the room is totally sealed, if there is such condition, opening the door of a plugged ref, upon arriving at the equilibrium of the total air temperature inside, can neither make the room cooler or make it hotter. the amount of energy to make the ref cool its freezer is also equal to the amount of heat removed to produce the coolness but that same amount of heat is discharged in its back. say, if you can "mix" those cold and hot air, the final result will be the exact initial temperature. "energy is neither created nor destroyed". hope i'm right. -caesar
Efficiency of refrigerator in terms of cooling is less than 100%. If you look at the fridge in terms of heating (it moves heat away from inside of fridge to the outside), then it is actually over 100% efficient, in fact close to 300%. All the heat which is removed from the "cool" region is dumped into the region you want to cool now, ie. your room. ie. It will do nothing but generate heat in the room.
If the technician took a duct and attached it to the air outlet in back of fridge and placed it outside the house then it will cool the room, but this would be impractical...
To the above:
... impractical and it would take a long time for the open refrigerator to cool down the room. Meanwhile all the sensitive material in the refrigerator would have warmed up and ruined any experiments they had in there.
because there is far more hot air in the room than there is cold air in the fridge, so the hot air in the room would overpower the cold air in fridge by quite alot.
Because the supply and the sink are the same :)
This could be a completely stupid answer, but could it be that the lab is one of those like... i dont know how to explain it. like a REALLY big refridgerator. Like the room is the refridgerator or something. But because the lab tech guy person is so used to it, he felt it was getting warm so opened the door to make it cooler, when actually he would just be making it warmer? Hm... this sounded smarter in my head.
Missed a bit to the above answer, in where im trying to explain the room. Like, you know on those sciency documentries where they have to keep the room really cold for the experiments or equiptment or whatever to work.
why would it be a household refridgerator with coils in the back. i would think that it would be either a walk in fridge or a temperature controlled room.
perhaps he was amused because although the refridgerator was colder than the lab the leb was temperature controlled and would automatically compensate for the drop.
either that or he was amused that the scientist had such a witty comeback when he is mostlikely on thin ice for spoiling the stuff in the fridge
It was silly for the technician to leave the door open becasuse it will ruin/destroy all he specimen,chemical and all those items preserved under the frigde temperature. therefore, the silly technician will end up losing his job.
karati
it's based on the carnot engine
This post has been removed by the author.
if the temperature your talking about is C' i think his technician want to cool the room in the frig. because the room itself (where the frig location) is cold already because of the aircondition. if you think about it if you left an aircon On, the room will be cold with no limit but if you on a frig there is a limit for coldness that's why i arrived in that answer.
Chikirat
Post a Comment
Links to this post:
Create a Link
<< Home