Apparatus for heating and cooling air

Claim 1

APPARATUS FOR CONDITIONING AIR COMPRISING, IN COMBINATION, MEANS DEFINING A COOLING CHAMBER AND A MIXING CHAMBER, A PAIR OF PASSAGES CONNECTING SAID CHAMBERS, ONE OF SAID PASSAGES HAVING AN EFFECTIVE AREA WITHIN THE LIMITS OF 20% AND 60% OF THE EFFECTIVE AREA OF THE OTHER PASSAGE, MEANS FOR MOVING A CONSTANT VOLUME OF AIR THROUGH SAID COOLING CHAMBER AND SAID PASSAGES TO SAID MIXING CHAMBER, A COOLER IN SAID COOLING CHAMBER OPERATIVE TO COOL THE AIR TO A PREDETERMINED MODERATELY LOW HIGH TEMPERATURE, SAID MIXING CHAMBER BEING EFFECTIVE TO THOROUGHLY MIX THE HOT AND COLD AIR DELIVERED THROUGH THE RESPECTIVE PASSAGES, AND DAMPER MECHANISM OPERATIVELY ASSOCIATED WITH SAID PASSAGES ADJUSTABLE TO COMPLEMENTALLY VARY THE PROPORTION OF AIR FLOWING THROUGH THE RESPECTIVE PASSAGES WHILE MAINTAINING THE TOTAL VOLUME OF AIR FLOWING SUBSTANTIALLY CONSTANT THROUGHOUT THE ENTIRE RANGE OF ADJUSTMENT OF SAID DAMPER MECHANISM TO BRING THE MIXTURE OF AIR IN SAID MIXING CHAMBER TO A PREDETERMINED TEMPERATURE, SAID DAMPER MECHANISM BEING PROPORTIONED TO PERMIT COMPLETE CLOSURE OF SAID ONE PASSAGE WHILE CLOSURE OF THE OTHER PASSAGE IS RESTRICTED TO A DEGREE WHICH REDUCES ITS EFFECTIVE AREA TO SUBSTANTIALLY THAT OF SAID ONE PASSAGE WHEN THE LATTER IS FULLY OPEN.