Patent GB-349798-A (GB)
Title: Improvements in heat transferring devices for use in conjunction with refrigerators
IPC: F25D11/02
Filed: 1930-06-16
Abstract: 349,798. Refrigerating; cooling- chambers. ELECTROLUX, Ltd., 153, Regent Street, London. -(Assignees of Platen- Munters Refrigerating System Aktiebolag; 2, Norrmalmstorg, Stockholm.) June 16, 1930, No. 18361. Convention date, June 19, 1929. [Class 29.] Absorption machines.-A heat transferring element of the kind comprising a closed system for a condensing- evaporating medium is removably connected as a whole to the cooling source of a refrigerating cabinet, and is adapted to cool parts of the cabinet or objects at a distance from the cooling source. Different forms of the heat transferring element adapted to various purposes may be used interchangeably with a standard form of cooling source, particularly an evaporator of an absorption machine of the inert gas type. The evaporator 4, Fig. 1, of an absorption machine has mounted thereon the usual ice-making element 5 and a gilled element 6 for cooling the main compartment 2 of a cabinet. A separate cabinet compartment 3 is cooled by the gilled evaporator component 7 of a heat transfer element comprising pipes 9, 11 and a coil 10 forming the condenser component, which is surrounded by a metal body 12 screwed or otherwise removably attached to the main evaporator 4. A heat transfer element in the form of a gilled cylinder may be employed for cooling the whole of a cabinet, in association with a main evaporator fitted with an insulated icemaking body. In the form shown in Figs. 6 and 7, the heat transfer elements consist of looped pipes 30, 39 attached to opposite sides of radiator plates 29. The condenser components are formed as conduits 35 in a block 36 secured by clamps 37 to the main evaporator 4. For cooling a rectangular or cylindrical vessel for iced foods &c. the heat transfer element may comprise a coil passing around or embedded in the wall of the vessel and connected to headers for conduits passing through the block clamped to the evaporator. A single straight tube with gills and connected to a similar block may be used for cooling a large cabinet, and an L-shaped tube may be used for small cabinets. Ice-making trays 60, Fig. 11, may have a cavity 61 containing the volatile medium, which evaporates at the handle end of the cavity and condenses at the end near the main evaporator 4, the heat being conducted through a shelf 62 carried by a block 36 clamped on the evaporator. Alternatively the conduit 61 may be located on or within the shelf. A body 36, Fig. 13, on the main evaporator 4 having ice-making cells and air-cooling ribs in the usual manner, is formed with a number of recesses 66, 67 for the condenser components of various forms of elements. One element has a gilled evaporator component 70 submersible in liquid to be cooled rapidly ; another element secured by a bayonet catch 68 is formed with a coil 72 to surround a bottle &c. to be cooled, the coil being surrounded by insulation 73. Where a different temperature is desired, as for example in cooling bottles without risk of breakage by freezing, the heat transfer element may contain also an inert gas such as air, nitrogen or hydrogen under pressure. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following:- The condenser component of the heat transfer element may be rigidly connected with the main evaporator by soldering or spray casting, detachable couplings being provided in the pipe connections to the evaporator component. The elements may be employed for cooling a number of cabinets in various rooms of a building from a central source of cold located, for example, in an attic. Each element is provided with a valve for local control of its associated cabinet. The elements may also be used for transferring heat from heatdelivering parts, such as the condenser G and absorber H, Fig. 15 (Cancelled), of a refrigerating machine. The evaporator component of the element is formed as coils 90, 91 around the absorber and condenser and is connected by couplings 92, 93 to a condenser component formed as a coil 96. This coil may be cooled by air in the open or in a ventilating shaft, or, as shown, by a limited quantity of water circulated continuously by a pump 101, make-up water being supplied by an automatic or other valve 103. An auxiliary gas may be used in this heat transfer system to ensure a determined temperature for the condenser and absorber of the machine. This subject-matter does not appear in the Specification as accepted.