Capacity-Control System for Cold 

 Storage Rooms 



Laboratory engineers have designed a 

 refrigeration control system that provides 

 improved flexibility of temperature control 

 in the cold-storage rooms that are used 

 for research on frozen seafood. In this 

 system the capacity of the refrigeration 

 compressor, which operates continuously 

 at constant speed, is automatically varied 

 to provide a cyclic pattern of change in 

 room temperature with any desired wave- 

 form in the range of -30° to +40° F. (-34° 

 to +4° C.). It also permits holding a storage 

 room at a constant temperature in this 

 range. Such versatility of control is im- 

 possible using conventional methods of 

 control. Studies are in progress to com- 

 pare operating costs and efficiencies of 



this system with those of a conventional off - 

 on thermostatically controlled system. 



Radiation-Pasteurization Research 



An investigation of the radiation-pas- 

 teurization of fish is being carried out 

 under contract with the U.S. Atomic Energy 

 Commission. This research, which will 

 provide data on the nutritive properties of 

 irradiated haddock fillets and clam meats, 

 is the first phase of a comprehensive pro- 

 gram on the use of atomic energy for the 

 preservation of food for civilian use. 

 Successful completion of this project may 

 make it possible to use low-level ionizing 

 radiation to preserve large quantities of 

 fresh marine fish and shellfish while they 

 are being transported to midwestern mar- 

 kets. 



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The control panel for the laboratory refrigeration facilities. 



