Patent ID: 8689575
Filing Date: 2014-04-08
Classification: F25B

Abstract:
1. A temperature control system employing a two-phase refrigerant and a compressor/condenser loop having an input and output for circulating refrigerant at a controllable temperature to and from a load evaporator having input and output terminals and a thermal capacity, the temperature control system including a subsidiary flow circuit for enhancing the performance of the system, comprising: a subsidiary heat exchanger coupled between the flow from the output of the compressor/condenser loop to the load evaporator input, the subsidiary heat exchanger having a smaller thermal capacity than the thermal capacity of the load evaporator, said subsidiary heat exchanger comprising: a thermo-expansion valve disposed in the first flow path between the output of the compressor/condenser loop and the input to the first flow path of the subsidiary heat exchanger; a sensing element for the thermo-expansion valve responsive to the pressure of the output flow in the second flow path from the subsidiary heat exchanger; and a pressure dropping device in the first flow path downstream of the subsidiary heat exchanger and upstream of the load evaporator, said pressure-dropping device introducing a pressure differential driving the counterflows of fluid in the first and second flow paths through the subsidiary heat exchanger and configured such that the temperature difference between the first and second flow paths through the subsidiary heat exchanger approximates the difference between the boiling temperature of the refrigerant in the load evaporator and the temperature of the refrigerant at the compressor input.