Heat transfer at equalized pressure

Claim 1

APPARATUS FOR CHANGING THE HEAT CONTENT OF A FIRST STREAM AT A GIVEN SUPERATMOSPHERIC PRESSURE BY MEANS OF A SECOND FLUID STREAM AT ANOTHER TEMPERATURE AND AT A LOWER PRESSURE THAN THE PRESSURE OF THE FIRST STREAM COMPRISING: A HEAT EXCHANGER HAVING DISTINCT FIRST AND SECOND SETS OF FLOW CHANNELS FOR THE FIRST AND SECOND FLUIDS, SAID FLOW CHANNELS BEING DEFINED BY THIN WALLS; MEANS FOR PASSING THE FIRST FLUID STREAM THROUGH SAID FIRST SET OF FLOW CHANNELS AT THE PRESSURE OF THE FIRST STREAM; POWER DRIVEN PUMP MEANS FOR PRESSURIZING THE SECOND FLUID STREAM FROM THE LOWER PRESSURE TO THE PRESSURE OF THE FIRST STREAM, SAID PUMP MEANS HAVING AN INLET AND AN OUTLET; CONDUIT MEANS CONNECTING THE PUMP OUTLET TO SAID SECOND SET OF FLOW CHANNELS WHEREBY THE PRESSURE ON EACH SIDE OF SAID CHANNEL-DEFINING WALLS IS SUBSTANTIALLY EQUAL THEREBY PERMITTING SAID WALLS TO BE OF THIN CONSTRUCTION CONDUCTIVE TO HIGH HEAT TRANSFER BETWEEN FIRST AND SECOND FLUIDS; AND CONDUIT MEANS CONNECTING SAID PUMP INLET WITH THE SECOND FLUID STREAM AT SAID LOWER PRESSURE.