Empty room

Question:

You are locked into an empty room with only a working refrigerator plugged into a standard electric outlet. The room is uncomfortably warm, and your goal is to cool the room to the maximum extent possible. What can you do?

.

.

C

A

P

T

A

I

N

I

N

T

E

R

V

I

E

W

.

.

Solution: Most candidates immediately think about opening the refrigerator to cool the room down. You can admit to that thought, but be wary. First of all, first impressions are never correct. Second, think deeper. What does a refrigerator really do? It’s really a heat pump. It takes heat away from the contents of the refrigerator and empties the heat into the room. Opening the door of an operating refrigerator would be the worst move. Here’s one candidate’s response:

Pull the plug on the refrigerator, and then open it. This will even out the lower temperature in the refrigerator with the higher temperature of the room, which will drop a little. The stupidest thing to do is to open the refrigerator without pulling its plug. It will then suck the heat of the room into its cooling compartment and get rid of it again through the cooling ribs on its backside, adding even more heat in the process. Being open, the cooling compartment will never be cold enough to trip the thermostat, and the fridge will be running constantly, in effect acting as an oven.

Answer: Unplug the refrigerator and open the door, allowing the cooler air in the refrigerator compartment to cool the room air a little bit. That’s the best you can do.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s

Powered by WordPress.com.

Up ↑

%d bloggers like this: