Fridge as a two-state appliance

[Pedro Nascimento]

Hi folks,

I have a question regarding the modelling of the fridge as a finite state machine. 

Why in some papers they consider the Fridge as a two-state appliance? 

Thanks,

Pedro.

[Jack Kelly (aka Daniel)]

Hi Pedro,

A reasonable but approximate model of a fridge is that it has two steady states:

1. "compressor off" (~0 watts) and 
2. "compressor on" (~100 watts).
   

Of course, this ignores a bunch of complexity of fridges.  e.g.:

• the fridge light; 
• the defrost mode; 
• the inrush current when the compressor starts and the slow decay in power demand as the compressor runs.

Thanks,

Jack

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[Pedro Nascimento]

Hi Jack,

Thanks again!!!

[Grant Fisher]

I would like to expand on Jack's response a bit. The defrost mode is a substantial use of power in most modern fridges. We have seen that in some fridges with unique circumstances, it approaches the use of the compressor (to keep it cold), so it shouldn't be underestimated or left out of models.

We have about 500 fridges in our dataset if you would like to check it out: dataport.pecanstreet.org.  It is free for academic researchers.

Thanks,

Grant

[Nipun Batra]

To add to Grant's response, I had used Dataport data set for one of my papers that was presented at Buildsys 2015. Figure 1 shows that defrost consumes a fair amount of energy. Section 4.1 in the paper contains more information about modelling fridge energy consumption. In some fridges, the lighting circuit can also be very substantial, to such an extent that one can infer when the fridge was opened!

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