Heating device

Claim 1

Heating apparatus for use with a heat source, which comprises an enclosed common heat reservoir, at least a portion of at least one wall of said common heat reservoir being associated with said heat source, a plurality of separate isothermal heating units traversing through said common heat reservoir and being formed of concentrically arranged spaced inner and outer tubular members, each end of each heating unit extending outwardly of said common heat reservoir, each said inner tubular member defining a heating chamber and each said pair of spaced tubular members together defining an annular heat reservoir in communication with said common heat reservoir, each end of each said annular heat reservoir being closed, a first capillary material on the inner surface of the walls of said common heat reservoir, a second capillary material on the inner surface of the walls of each said annular heat reservoir, and a third capillary material extending between said second capillary material and said first capillary material, and a vaporizable and condensible heat-transporting medium in said common heat reservoir and said annular heat reservoirs, said medium, when heat is supplied to the common heat reservoir by said heat source, vaporizing and flowing into the annular heat reservoirs wherein it condenses and provides heat for transmittal through the respective inner tubular members into the respective heating chambers, the resulting medium condensate flowing back into said common heat reservoir at least partly by means of said third capillary material.