Absorption refrigeration

Claim 1

IN AN ABSORPTION REFRIGERATION SYSTEM HAVING A CIRCUIT FOR CIRCULATION OF ABSORBTION LIQUID COMPRISING AN ABOSRBER AND A GENERATOR AND LIQUID HEAT EXCHANGER THEREBETWEEN HAVING PASSAGES FOR FLOWING IN THERMAL RELATION ABSORPTION LIQUID RICH AND WEAK, RESPECTIVELY, IN REFRIGERANT, A PLURALITY OF PIPES IN THE IMMEDIATE VICINITY OF ONE ANOTHER, ONE OF SAID PIPES FORMING A GHETING TUBE, SAID GENERATOR COMPRISING SEVRAL OF SAID PIPES WHICH ARE CONNECTED IN SAID CIRCUIT AND AT LEAST ONE OF WHICH CONTAINS ABSORPTION LIQUID ARRANGED TO RECEIVE HEAT FROM SAID HEATING TUBE, MEANS FOR HEATING SAID HEATING TUBE, MEANS FOR INSULATING SAID GENERATOR AND SAID HEATING TUBE FROM THE SURROUNDINGS COMPRISING AN INNER LAYER OF INSULATION AND AN OUTER LAYER OF INSULATION OF LOWER THERMAL CONDUCTIVITY THAN THE INNER LAYER, THE OUTER LAYER OF INSULATION COMPRISING MATERIAL WHICH IS ADVERSELY AFFECTED AND LOSES AT LEAST SOME OF ITS THERMAL INSULATING PROPERTIES WHEN SUBJECTED TH HEAT AT ELEVATED TEMPERATURES CORRESPONDING TO THE TEMPERATURES DEVELOPED BY SAID HEATING TUBE AND SIAD ONE GENERATOR PIPE DUE TO HEATING BY SAID HEATING MEANS DURING NORMAL OPERATION OF THE SYSTEM, SAID INNER LAYER OF INSULATION BEING CAPABLE OF WITHSTANDING THE HEAT PRODUCED BY SAID HEATING TUBE DURING NORMAL OPERATION OF THE SYSTEM AND BEING SO CONSTURCTED AND FORMED THAT THE TEMPERATURE GRADIENT IN AN OUTWARD DIRECTION THERETHROUGH WILL BE SUFFICIENT TO ENABLE THE OUTER PORTION OF SAID OUTER LAYER OF INSULATION TO TEND TO FUNCTION AT A VALUE OF THERMAL CONDUCTIVITY APPROACHING ITS NORMAL VALUE AND ALLOW THE INNER PORTION OF THE OUTER LAYER OF INSULATION TO LOSE SOME OF ITS THERMAL INSULATING PROPERTIES DUE TO HEAT DEVELOPED BY SAID HEATING MEMBER AND SAID ONE GENERATOR PIPE DURING NORMAL OPERATION OF THE SYSTEM, THE THERMAL CONDUCTIVITY OF THE INNER PORTION OF SAID OUTER LAYER OF INSULATION BEING AT LEAST AS LOW AS THE THERMAL CONDUCTIVITY OF THE INNER LAYER OF INSULATION WHEN IT LOSES SOME OF ITS THERMAL INSULATING PROPERTIES DURING NORMAL OPERATION OF THE SYSTEM, SAID OUTER LAYER OF INSULATION COMPRISING FOAMED PLASTIC, AND HEAT REFELCTING MATERIAL AT THE INNER SURFACE OF THE FOAMED PLASTIC.