Patent GB-1169892-A (GB)
Title: Improvements in or relating to Heaters
Inventor: ELLINGER JOHN HENRY
IPC: F24H7/04
Filed: 1965-09-17
Abstract: 1,169,892. Storage heaters. J. H. ELLINGER. 9 Nov., 1966 [17 Sept., 1965], No. 39691/65. Heading F4U. A storage heater comprises an inner container, the bottom of which is closed, which at least in part surrounds and is spaced from the heat storage mass, and an outer container which surrounds the inner container to define therewith a fluid space, the outer container having an opening at its lower end. As shown in Fig. 2, a space heater comprises a storage mass 12, an insulating casing 11 and a baffle 21 which is interposed between the mass and casing to define an elongated flow path in which air from an inlet 19 flows sequentially between casing 11 and wall 23 of the baffle, between wall 23 and mass 12, between the bottom wall 36 of the baffle and the mass, between the mass and wall 22 of the baffle and between wall 22 and the casing to an outlet 18. A fan 20 is provided at the inlet, a by-pass 49 is provided beneath wall 36 and a thermostatic valve 51 at the outlet apportions air flow from the by-pass and elongated flow path. Horizontal fins 34 together with vertical fins (Fig. 4, not shown) cause air in the elongated flow path to flow in a tortuous path. The mass 12 preferably comprises an eutectic mixture of NaOH and NaNO 3  and is accommodated in a thin-walled container 14, and in the event of failure of the latter the storage medium is trapped in the container formed by the baffle 21 and prevents air flow in the elongated path. The mass 12 is heated by rodlike electric heating elements 55 depending from bus-bars 56 and temperature responsive devices 57a and 57b are provided at the upper and lower ends of one element 55a. The devices are arranged to terminate heating when the temperature difference therebetween is greater than a predetermined value, as would occur if device 57a were exposed to air because of leakage of the storage medium. The facing surface of the baffle and container 14 are painted black and those of the baffle and casing 11 are bright. Fig. 8 shows a water heater having an annular storage mass 92, a water inlet 100, a water outlet pipe 108 surrounded by a jacket 111, a jacket 125 surrounding the mass 92 and a baffle 104 which defines a water flow path 121, 122, 123 communicating with the lower end of pipe 108, and an air flow path 113 which communicates via pipes 112 with jacket 111. Fins 103 are provided on the frusto-conical bottom of the jacket 125 and a water driven turbine 116 in pipe 108 drives an impeller 110 for circulating air in path 113. Water from pipe 100 enters the base of the casing through apertures 119 in a bellows 117 which is connected to a float 118. The water level is determined by the air pressure in path 113 and jacket 111; thus at low temperatures and hence pressures the water rises to partially cover fins 103 so that the water is heated thereby. Jacket 125 is connected by pipe 98 to a chamber 99 in the casing for receiving the liquid heat storage medium in the event of leakage. A stand pipe 124 communicating with an expansion tank (not shown) communicates with the water flow path. In a further embodiment (Fig. 6, not shown) an air heater comprises an annular storage mass (62) in a cylindrical housing (61), and a cylindrical, helically finned baffle (78) between the mass and housing. Air is passed into the centre of the annular mass and thence through the elongated flow path provided by the baffle. A thermostatically controlled by-pass pipe (67) is also provided in the centre of the mass.