Package heat exchanger system for heating and cooling

Claim 1

A package heat exchange system comprising: first and second regions of said package substantially surrounded by exterior wall means and separated by interior wall means; a liquid circulating system extending through said interior wall means between said first and second regions within said exterior wall means; a combustion products heat exchanger located in said first region of said package for transferring thermal energy from the products of combustion to said liquid circulating system comprising a plurality of conduits for said liquid positioned around a central plenum and rigidly interconnected at least at their ends by members bonded to said liquid conduits; each of said liquid conduits having a plurality of members bonded thereto and providing the major portion of the surface area of said conduits contacting said combustion products and having a combined surface area which is substantially greater than the surface area of said combustion products heat exchanger contacting said liquid; liquid-to-air heat exchange means positioned in said second region of said package for transferring thermal energy from said liquid circulating system to air; said liquid-to-air heat exchange means having a surface area contacting said air which is substantially greater than the surface area of said liquid-to-air heat exchange means contacting said liquid; means in said second region for directing air through said liquid-to-air heat exchange means and through said exterior wall means; means in said first region for directing the products of combustion through said combustion products heat exchange means and said exterior wall means comprising a burner supplied with a fuel-air mixture by a blower whose input is supplied with air passing through said exterior wall means; means for maintaining said liquid substantially at atmospheric pressure and for preventing substantial vaporization of said liquid comprising means for circulating said liquid in said circulating system at a rate which removes thermal energy from said combustion products heat exchanger at a rate which maintains said liquid flowing through said conduits at a temperature below the vaporization temperature of said liquid at atmospheric pressure; and thermostatic means responsive to the temperature of said liquid for energizing said liquid circulating means and said air directing means whenever said temperature is above a predetermined value below said vaporization temperature.