Patent ID: 9360243
Filing Date: 2016-06-07
CPC Classification: A23G,F25B

Claim Text:
1. A control system employing a two-phase refrigerant output from a compressor to control the temperature of a thermal load in different modes so as to provide different selectable dynamic ranges and degrees of temperature resolution, the system comprising: a first control loop receiving the compressor output and providing a variable temperature level output to the thermal load, the first control loop including flow circuits for mixing a variable proportion of the compressed output of the compressor with a cooled expanded derivative flow of the remainder of the compressed output to control the temperature of the thermal load; a second control loop receiving the output of the thermal load and including an additional flow circuit for alternatively controlling the temperature of the thermal load by regulating the back pressure presented by the thermal load; a controller responsive to mode commands for providing control signals to activate the first and second control loops and establish target temperatures therefore; and a third control loop responsive to the controller and coupled in the output of the thermal load, the third control loop including a thermo-expansion valve and a series-coupled ambient temperature evaporator in circuit therewith and providing an ambient temperature level flow to the compressor input, wherein the thermo-expansion valve is responsive to the temperature at the compressor input.