Patent GB-638772-A (GB)
Title: Improvements in absorption refrigerating apparatus and cabinets cooled thereby
IPC: F25D11/02
Filed: 1948-02-19
Abstract: 638,772. Refrigerating. ELECTROLUX, Ltd. Feb. 19, 1948, No. 4873. Convention date, Feb. 28, 1947. [Class 29] A refrigerator cabinet having a cooling chamber divided into at least two separate compartments each provided with an evaporator operating at a temperature different from that of each other evaporator is cooled by an absorption system of the inert gas type, the evaporators of which extend each in a substantially vertical plane, the planes being either parallel to or coextensive with one another. As shown in Figs. 1, 2 and 8, the cooling chamber is divided by a partition 54 into two compartments 55, 56 cooled by a high temperature evaporator 20 and a low temperature evaporator 18 respectively, the coils of the latter being formed with flats 57 carrying aluminium plates to support ice trays 58 and the former being enclosed in a casing 64. Refrigerant condensed in a condenser 13 flows by a pipe 14 in heat exchange with the evaporator 20 to the evaporator 18 and condensate from a condenser 16 flows by a pipe 17 to the evaporator 20. To ensure a supply of refrigerant to evaporator 20 condensate from the top run 48 of condenser 13 flows by a U-tube 47 to the bottom run of condenser 16. The bottom runs of the evaporators 18, 20 lie below the top of the absorber coil 26 and above the liquid level in the absorber vessel 25. Inert gas from the absorber 26 flows through the inner conduit 23 of a gas heat exchanger 21, a pipe 35, the evaporator 18 in the same direction as the refrigerant, a pipe 19, the evaporator 20 in counterflow to the refrigerant, a pipe 34, the outer conduit 22 of the gas heat exchanger 21 and a pipe 24 to the absorber vessel 25. Unevaporated refrigerant drains from the bottom of the evaporators to the absorber vessel by a pipe 36 In a modification (Figs. 3, 4, 5, 9 and 10, not shswn) the evaporators 18, 20, which are situated entirely above the absorber coil, extend only part way down the cabinet, the bottom of the compartment 56 being closed by an additional partition. In this embodiment, inert gas flows through evaporator 18 in counterflow to the refrigerant and through evaporator 20 in the same direction as the refrigerant. In a further modification, Figs. 6 and 12, the cooling chamber is divided by a horizontal partition 61 into an upper deep-freezing compartment 62 and a lower storage compartment 63 cooled by evaporators 18, 20 respectively lying in the same vertical plane. Condensate from condenser 13 flows through a pipe 14, evaporator 18, a pipe 40 and evaporator 20. Inert gas from absorber coil 26 flows through the outer conduit 22 of gas heat exchanger 21, a pipe 38, the outer conduit 45 of heat exchanger 44, the evaporator 18 in counterflow to the refrigerant, a pipe 19 which forms the inner conduit of the heat exchanger 44, the evaporator 20 in the same direction as the refrigerant and the inner conduit 23 of the gas heat exchanger 21 to the absorber vessel 25. A dam 41 for liquid refrigerant is located at the lower end of the evaporator 18. Liquid drains from the heat exchanger 44 to the evaporator 20 by a pipe 39. The gas heat exchanger drains to the absorber vessel 25 by a pipe 46. The pipe 14 is in heat exchange with the pipe 19.