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== single phase and three phase compressors == 

can you convert a three phase compressor to a single phase? Or what size compressor would you need to run a cooler that is 17 x 11 feet?


The term "single phase" and "Three phase"  refer to the windings of the motors themselves. a three phase  motor relies on all three phases of the windings to rotate the motor armature one complete revoluton.   So in answer to your first question, no you cannot convert a three phase compressor into a single phase compressor unless it is a semi-hermetic(bolted together) compressor.  However in order to change a three phase semi-hermetic you would have to replace the motor windings and armature into a single phase and this is not cost effective.    and for your other question,  a 17 x 11 ft cooler would need at least a one ton cooling unit ( that is if it is a cooler not a freezer) and that determination is climate sensative in colder climates where the cooler walls are outside will probably need less cooling.   This calculation is best to be left to a professional  that can bid your specific situation and determine amount of btu's needed and heat gain for the space.   --snoopy612
p.s. here's a  article that may assist in understanding single to three phase. http://en.wikipedia.org/wiki/Single-phase_electric_power  as for your other question search -Refrigeration.