Patent ID: 6591621
Filing Date: 2003-07-15
Classification: F04B,F25B,G11C

Abstract:
A heat pump system, comprising:a two-stage compressor having a piston disposed in a compression chamber, a crankshaft coupled with the piston, and a reversible motor for rotating the crankshaft in a forward direction to operate the compressor in a first stage at a first fixed load and a reverse direction to operate the compressor in a second stage at a second fixed load; a condenser; an expansion device; an evaporator; means for operating the compressor, condenser, expansion device, and evaporator as a heat pump that can selectively provide air conditioning and heating, as required; and a control system for operating the system in a heating mode with the compressor running at the first stage or the second stage, based upon the heating requirements, and for operating the system in an air conditioning mode with the compressor running only at the first stage.