Method and apparatus for employing fluids in a closed cycle

Claim 1

METHOD OF EXTRACTING WORK FROM A FLUID CIRCULATING WITHIN AN ENCLOSED SYSTEM, COMPRISING THE STEPS OF (A) TRANSFERRING A FIRST QUANTITY OF COLD FLUID FROM A FIRST ENCLOSED SPACE TO A SECOND ENCLOSED SPACE AND HEATING SAID FLUID DURING TRANSFER THEREBY TO CAUSE AN INCREASE IN PRESSURE AND TO DELIVER ENERGY EXTERNALLY, WHILE SIMULTANEOUSLY TRANSFERRING A SECOND QUANTITY OF HOT FLUID FROM A THIRD ENCLOSED SPACE TO A FOURTH ENCLOSED SPACE AND COOLING SAID FLUID DURING TRANSFER THEREBY TO CAUSE A DECREASE IN FLUID PRESSURE AND TO DELIVER COLD LOW-PRESSURE FLUID INTO SAID FOURTH SPACE; AND (B) TRANSFERRING SAID COLD LOW-PRESSURE FLUID IN SAID FOURTH ENCLOSED SPACE TO SAID THIRD ENCLOSED SPACE AND HEATING SAID FLUID DURING TRANSFER THEREBY TO CAUSE AN INCREASE IN PRESSURE AND TO DELIVER ENERGY EXTERNALLY, WHILE SIMULTANEOUSLY TRANSFERRING HOT FLUID FROM SAID SECOND ENCLOSED SPACE TO SAID FIRST ENCLOSED SPACE AND COOLING SAID FLUID DURING TRANSFER THEREBY TO CAUSE A DECREASE IN FLUID PRESSURE AND TO DELIVER COLD LOW-PRESSURE FLUID INTO SAID FIRST SPACE PREPARATORY FOR STEP (A);