Patent ID: 8881541
Filing Date: 2014-11-11
Classification: F25B,Y02B

Abstract:
1. A cooling system, comprising: a cabinet having an air inlet and an air outlet; an air moving unit disposed in the cabinet; a tandem compressor, a condenser, an electronic expansion valve and an evaporator arranged in a direct expansion cooling circuit; the tandem compressor including a variable capacity digital scroll compressor and a fixed capacity scroll compressor; a controller coupled to the electronic expansion valve that controls the electronic expansion valve, the controller selecting which of a plurality of superheat control modes to use in operating the electronic expansion valve based on control parameters and a current operating status of each of the variable capacity digital scroll compressor and fixed capacity scroll compressor of the tandem compressor; wherein the plurality of superheat control modes include a gated mode, a system mapping mode and a constant mode, wherein: