Patent GB-171380-A (GB)
Title: Improvements in or relating to central cooling installations
IPC: F25D17/02
Filed: 1921-11-05
Abstract: 171,380. Labolle, G. C. Nov. 9, 1920, [Convention date]. Cooling buildings; refrigerating, compression machines for; cooling air; circulating brine through chambers.-A central cooling system for domestic and other buildings, applicable also to ships and vehicles, comprises an electrically-driven compression refrigerating machine for cooling brine, and a pump driven from the machine for circulating the cooled brine through a series of heat-interchangers arranged in the various rooms. When the brine is not in circulation through the interchangers it may be employed to freeze water in cans. A control device is provided whereby when a valve is opened in any room to permit the brine to circulate through the interchanger, the motor circuit is closed to start the refrigerating machine. A construction of interchanger combined with fans for circulating cooled air in a room is also described. The compression refrigerating machine A, Figs. 1 and 2, is preferably of the type having rotary evaporator and condenser casings, as described in Specifications 13692/06, 17224/04, and 22279/94, and is driven from a motor a. The evaporator cools brine in a tank G, and this brine circulates through pipes b in another tank B to cool the brine for the circulating system. A brine pump b<3> driven from the shaft a<1> of the machine raises the brine from the tank B to an elevated tank C, from which leads a pipe C<1> conveying the cooled brine to various interchangers D. A pipe C<2> conveys the overflow from the tank C back to the tank B. An air vent in the tank B is controlled bv a float valve. The rising pipe B<1> from the pump leads into a bent tube c<2>, Figs. 7 and 9, having a contracted end c<3> discharging into the service pipe C<1>, with an overflow opening into a chamber c<1>. Within this chamber is a, float c<8> and a bell c', the float carrying a valve c<11> adapted to close against a seat c<10> on the bell. The float first rises and closes the valve, after which the float and bell rise together against the resistance of a spring c<12>, and rock an arm c<19> to actuate the movable arm C<15> of a switch controlling the circuit of the motor a. The construction provides for the closing of the motor circuit when the bell falls, consequent upon a flow of brine through the interchangers, and the opening when it rises as a result of an interruption of the flow. Branch pipes D<1> lead from the pipe C<1> to the interchangers, and return branches D<2> lead to a return main B<2>. The interchangers may comprise a series of brine pipes d, Figs. 10 and 11, connected to one another by screw unions d<1>. Air may be circulated around the pipes by fans d<2> driven by electric motors d<3>. Louvres d<4> may be arranged to deflect the air downwards, and the whole may be located within an openwork casing d<5>. A combined brine cock and switch E may be associated with each interchanger. The casing e of the brine cock e<3>, Fig. 12, has extended ports to permit of flow of brine in any of three settings of the handle E<1>. A switch F mounted on the stem of the cock is adapted to control the motors d<3> of the air-circulating fans d<2>. Radial contact members f cooperate with contacts f<2> let into the insulated wall f<1> of a cap f<3>. By depressing the cap against the resistance of a spring f<4> it may be rotated independently of the brine cock. The construction provides for control of the fan motors only, or of the fan motors and machine motor, or of the machine motor only.