Comment by bluGill
4 hours ago
I'm not sure how any of that is actionable. I already know how to make my fridge more efficient - but if I knew how to get my kids to close the door instead of leaving it open while the pour their milk (on the other side of the kitchen) I'd do that.
I get mail from my utility that I use more electric than average. However that doesn't give me anything actionable to do about it. I don't need another nag about things I can't do anything about.
I’m still on the fence about closing the door for a short task like pouring milk. My understanding from the physics of opening the door, you’re mostly already replacing all the air in the fridge with air from outside the fridge. So convection already did its job of robbing your fridge of cold. Closing the door to open it again a minute later just gives you a second convection inducing action for air that might have been trapped the first time.
I would love to see someone at the level of technology connections do a breakdown of the physics here, and where the likely crossover point point is for different kinds of fridges. My current (probably illformed) belief from the suction and imagined resulting air exchange of all the fridges I’ve lived with is that leaving the fridge open on the order of seconds is better than opening-closing-opening-closing in terms of cold loss.
You’re only losing cold air, which has very little mass compared to what you’re actually storing in your fridge. The energy cost to re-chill the air in the unoccupied volume of your fridge can’t be that significant, I’d imagine.
It’s be an interesting experiment to put a temperature probe in something like a block of cheese, let it cool to the ambient fridge temperature, then open the fridge door for a few minutes and see if the temperature of the cheese even measurably changes over the next few hours or whatever amount of time.
its not