I'm building a curing chamber in an old fridge, and I've started by capturing some data on the fridge's performance:
I'm really unclear on what's happening when the compressor changes state. When the compressor turns on, immediately the relative humidity drops by 20%, before beginning a slow climb. When the compressor turns off, the immediately the relative humidity rises by 20%, before beginning a slow fall.
The slow climb and slow fall make sense to me: I believe this is consistent with the fact that air at higher temperatures can accommodate a higher quantity of water per unit volume -- so assuming we have a fixed total amount of water in the air is constant, relative humidity will fall slowly as temperature rises, and rise slowly as temperature falls.
What I don't understand are the dramatic 20% jumps that occur right when the compressor changes state. Can someone help me understand what's going on? (The behavior is consistent with a substantial quantity of water being immediately sequestered from the air when the compressor turns on, and released back into the air when the compressor turns off, but I'm unclear on whether this is what's happening, or why.)