Original Publication Date: 1985-Sep-01
Included in the Prior Art Database: 2005-Feb-19
In controlled temperature cooling where the temperature of the coolant is controlled by variation of the pressure over the refrigerant liquid, an improvement is achieved through the use of an electronic mass flow controller to control the flow of vapor and hence the pressure. A suitable refrigerant liquid is FREON-12*, which is dichlorodifluoro- methane. The control system in side and top views is shown above. * Trademark of E.I. du Pont de Nemours & Co.