Method and apparatus for control of a variable speed compressor
OwnerNityanand Agrawal, Suresh Akella +3inventors
InventorsNityanand Agrawal, Suresh Akella, Kotresh Shivakavi, Sundar Doraiswamy, T. Raghavendra
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Abstract
A vapor compression system includes a fluid circuit circulating a refrigerant in a closed loop. The fluid circuit has operably disposed therein, in serial order, a variable speed compressor, a first heat exchanger, an expansion device and a second heat exchanger. A first blower device is associated with the first heat exchanger. A speed of the first blower device is dependent upon a speed of the compressor. A second blower device is associated with the second heat exchanger. A speed of the second blower device is dependent upon the speed of the compressor.
Claims20
A vapor compression system comprising:
- a fluid circuit circulating a refrigerant in a closed loop, said fluid circuit having operably disposed therein, in serial order, a variable speed compressor, a first heat exchanger, an expansion device and a second heat exchanger;
- a first blower device associated with said first heat exchanger, a speed of said first blower device being dependent upon a speed of said compressor;
- and
- a second blower device associated with said second heat exchanger, a speed of said second blower device being dependent upon the speed of said compressor.
A method of controlling a room temperature, said method comprising the steps of:
- determining a first temperature differential between a first actual temperature and a desired temperature;
- operating a compressor;
- ascertaining a subsequent temperature differential between a subsequent actual temperature and the desired temperature after said operating step;
- decreasing a speed of said compressor if the subsequent temperature differential is less than an immediately preceding temperature differential;
- and
- repeating said operating, ascertaining, and decreasing steps so long as the speed of said compressor is greater than a threshold speed and the subsequent temperature differential is greater than a threshold temperature differential.
A vapor compression system comprising:
- a variable speed compressor;
- and
- a control device configured to:
- repetitively determine a temperature differential between an actual room temperature and a desired room temperature;
- and
- selectively operate said compressor in a first mode and a second mode, the first mode including decreasing a speed of said compressor after each said temperature differential determination so long as a most recently determined temperature differential is less than a second most recently determined temperature differential, the second mode including substantially continuously varying the speed of said compressor based upon the determined temperature differentials.
Dependencies are inferred from the claim text.