Patent GB-451847-A (GB)
Title: Improvements in or relating to cooling and dehumidifying gases, such as air
IPC: B23D61/12
Filed: 1934-11-06
Abstract: 451,847. Refrigerating; cooling air. KELVINATOR CORPORATION, 14250, Plymouth Road, Detroit, Michigan, U.S.A. Nov 6, 1934, Nos. 31881, 31882, 31883, 31884, 31885, 31886, 31887, 31888, and 31889. Convention dates, Nov. 8, 1933, Nov. 8, 1933, Nov. 8, 1933, Nov. 14, 1933, Nov. 14, 1933, Nov. 14, 1933, Dec. 23, 1933, Feb. 15, 1934, and March 7, 1934. [Class 29] [See also Groups XXIX and XXXV] Air or other gas to be maintained within determined temperature and humidity conditions is circulated over a cooling surface, a part of which is varied in temperature automatically in accordance with the humidity and /or temperature of the air to be conditioned, while the cooling effect of the surface as a whole is adjusted so as to maintain both temperature and humidity of the air within desired limit. More or less moisture from the air is condensed on the cooling surface as the temperature is varied. Several cooling systems are described, each of which comprises an evaporator such as 10, Fig 1, divided into two parts 11, 12, connected to a compression refrigerating-machine 18-20, and housed in a chamber 25. This chamber may be located in a room 24, the air of which is to be conditioned, and the air is circulated by a fan 28 over the evaporator and past a partition 30 to an outlet 27. In the system of Fig. 1, the two parts of the evaporator are supplied in parallel through expansion valves 15, 16 controlled by thermostats 57 at the vapour outlets, while a valve 35 located in the vapour outlet of the part 11 is controlled, through an electromagnet, by a humidostat 36, in such a manner as to reduce the temperature of part 12 to condense out moisture from the air when the humidity is too high. The circuit of the compressor motor 22 is controlled by a room thermostat 34 and switch 64. Condensed moisture is drained from the chamber at pipe 33. The parts of the evaporator may be in series, with a main float expansion valve and a further valve between the parts controlled by the humidostat; or two valves may be arranged between the parts, one controlled by the humidostat and the other by the room thermostat, the motor circuit being controlled by the humidostat or the room thermostat. In another system, Fig 6, the first part 311 of the evaporator is supplied through a float valve 340 and the second part 312 through a float valve 321 supplied with unevaporated refrigerant from the first part. Valves 343, 344, controlled respectively by the humidostat 390 and the room thermostat 382 are arranged in the first vapour return pipe 330 to vary the cooling action of the two parts. The circuit of the motor is controlled by switches 362, 363 from the humidostat and thermostat as shown. In another system, Fig. 7, with evaporator parts in series supplied through float valves 447, 452, a valve 468 controlled by the humidostat 487 is located in a connecting pipe 465 between the two vapour return conduits 457, 455, which lead to separate cylinders of a multi-stage compressor 435. An oil trap 460 is located in return pipe 457. The motor circuit is controlled by warm and cold thermostats 472, 503 and the humidostat. Further modifications of the above systems are described, the valve or valves controlled by the humidostat or thermostat being located in various parts of the refrigerant circuit. In a system with a single expansion valve for evaporator parts in series, Fig. 13 (not shown), the valve, Fig 14, is adjusted by the humidostat to vary the evaporator pressure. It comprises a valve member 723 carried by a diaphragm 720 and urged to the closed position by an adjustable spring 725 located in the high pressure inlet chamber 717. Normally it is controlled by variation on the low pressure side 718, the opening being assisted by a spring 731 located between the diaphragm 720 and a second diaphragm 730. The armature 735 of an electromagnet controlled by the humidostat adjusts a lever 737 to engage the diaphragm 730 and assist the spring 731. Specification 385,833 is referred to.