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lutful
... of ideas
Premium Member
join:2005-06-16
Ottawa, ON

lutful to aurgathor

Premium Member

to aurgathor

Re: [Appliances] Is there a fridge that works correctly at any temperature?

Perhaps a standard gas compressor becomes inefficient if the ambient temperature is low enough to start cooling the incoming low pressure gas to contain some liquid?
54067323 (banned)
join:2012-09-25
Tuscaloosa, AL

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54067323 (banned)

Member

said by lutful:

Perhaps a standard gas compressor becomes inefficient if the ambient temperature is low enough to start cooling the incoming low pressure gas to contain some liquid?

To answer your question, if the evaporator does not fully flash off the refrigerant within the evaporator, any remaining un-evaporated refrigerant will flash off within the shell of the compressor and will actually aid in cooling the windings within the compressor.

This is why it is critical after maintenance, to recharge small refrigeration systems with exactly what the rating label states, too little refrigerant and the compressor will run hot and the device will not have the rated capacity it is designed for.

None the less, the efficiency of a small appliance compressor is higher when the ambient temperature is lower, as that lower temperature increases the efficiency of the condenser and therefore lowers the head pressure of the compressor dropping the amperage it is pulling.

Hope that answers your question.
lutful
... of ideas
Premium Member
join:2005-06-16
Ottawa, ON

lutful

Premium Member

Click for full size
Danfoss describes a compressor failure mechanism in low ambient temperature:
»www.danfoss.com/NR/rdonl ··· 7web.pdf
lutful

lutful

Premium Member

Yet another bulletin on low ambient operation.