Abstract: An air conditioning apparatus which includes an outdoor unit incorporating therein an outdoor heat exchanger working as a condenser during cooling and a fan for cooling the heat exchanger, and a plurality of indoor units each incorporating therein a compressor, an indoor heat exchanger working as an evaporator during cooling and a pressure reducer. The indoor and outdoor units are connected through cooling medium supply and return pipings through which cooling medium at high pressure flows during cooling, while cooling medium at low pressure is caused to flow therethrough during heating for efficient air conditioning and facilitation of installment of the apparatus.

Abstract: The disclosed system includes first and second hermetic shell compressors, one of which always runs while the system is operating and includes unloading means for running at half load, and the other compressor operating at full load or not at all so that four operating capacity steps are available, both of the compressors having shells with suction gas inlets, oil equalizer line ports, and gas exchange line ports being identically sized and located with respect to each other so that standard compressors can be stocked and used in the multiple compressor system while the multiple compressor system is capable of being operated at the varying capacities.

Abstract: An air source heat pump system includes in a primary refrigeration circuit a hermetic screw compressor and a helical screw rotary expander selectively clutchable to the permanently coupled helical screw compressor and electric induction drive motor. A solar/reclaim evaporator alternately functions as an expander boiler to feed refrigerant vapor to the compressor injection slide valve or to the feed port of the helical rotary screw expander to cause the expander to drive the compressor under compressor load or to drive the electric induction motor as a generator with the compressor unloaded. The solar/reclaim evaporator and expander boiler may be selectively fluid connected to the injection slide valve or to the suction port of the compressor. The hydronic system heating condenser and water chilling evaporator coil may form basic input and rejection heat exchangers to cascaded building zone heat pumps.

Abstract: A flat plate hydrodynamic thrust bearing for orbiting machinery and scroll-type apparatus embodying the thrust bearing are disclosed. The thrust bearing exerts an axial force on the orbiting scroll member to ensure efficient radial sealing of the scroll assembly; and one of the contacting surfaces of the bearing and or of the orbiting scroll member, serving as a journal, has a plurality of intersecting groovings to ensure continuous lubrication of the surfaces. The scroll apparatus is particularly suited for incorporation in a closed cycle refrigeration system wherein minimum wear over extended periods and quiet and reliable operation are required.

Abstract: A recirculating refrigeration system wherein a screw compressor receives vaporized refrigerant from the evaporators at its low pressure inlet and from a flash tank or receiver at an intermediate pressure inlet. Refrigerant which is not vaporized in the evaporators is trapped in a suction line accumulator from which it flows by gravity into a dump tank. The dump tank has a gas pressure connection to the compressor outlet or to the receiver or flash tank and a control valve is effective to introduce gas under pressure to the dump tank and force the liquid accumulated therein back into a receiver when it has risen to a predetermined level in the dump tank.

Abstract: A pump installation has a first heat exchanger for heating a fluid, a compressor unit connected to the first exchanger and having static mechanical means for pre-compression and temperature increase of the fluid, a motor-driven compressor connected to the compressor unit, for compressing the fluid, and a second heat exchanger for passing heat from the fluid to a working circuit fluid. A first valve passes fluid from the outlet of the compressor to the second exchanger selectively directly or indirectly through the compressor unit, and a second valve passes fluid from the outlet of the second exchanger to an expansion means for feeding the fluid back to the first exchanger selectively directly or indirectly through the compressor unit.

Abstract: A refrigeration type air conditioning apparatus employing a heat transfer medium for use in a vehicle having a large passenger area, comprising a vehicle engine driven compressor and a pair of electric motor driven compressors, all of which are connected to a pair of condenser coils via a discharge manifold and to a split evaporator coil via a suction manifold while each of the condenser coils is connected to one half of the evaporator coil via an expansion valve.

Abstract: The present invention provides a twin slab heat exchanger A-frame assembly having a plurality of refrigerant circuits arranged to provide a first and second circuit in each of the heat exchanger slabs. The first circuits in each heat exchanger being connected to provide the evaporator in one refrigerant system with the second circuits in each heat exchanger connected to provide the evaporator of another refrigerant circuit. The first and second circuits being arranged so that one precedes the other in air flow communication relative to air passing through the heat exchanger assembly.

Abstract: An apparatus for being installed within a truck or bus vehicle, the apparatus consisting of a pair of air conditioner compressors and a power take-off drive for the compressors which takes power from a transmission located on the truck or bus chassis.

Abstract: A refrigeration system in which refrigerant liquid is cooled by self-evaporation and is used for refrigerating in the liquid form, in which the self-evaporation is in stages, each having a vapor compressor, the expansion taking place in enthalpy converting liquid turbines instead of permitting partial vaporization through valves into vapor separators. The enthalpy converting liquid turbines are much more efficient than the adiabatic liquid expansion which is customarily used in refrigeration systems in which a cold liquid cooled by the expansion is evaporated to absorb heat and thus to provide cooling. There is much less irreversibility and hence increase in entropy is reduced, especially when removal of super heat from the compressed vapors in each stage is effected by quenching with a small portion of the refrigerant liquid. A good portion of this heat is recovered as mechanical energy in the enthalpy converting turbines.

Abstract: In a refrigerating system containing an evaporator, a condenser, a compressor and a closed vessel which receives condensed refrigerant from the condenser. The vessel has outlets connected to the compressor and to the evaporator. Communication between the vessel and the compressor is established for a regulated period to lower the pressure in the vessel, causing the refrigerant therein to boil. During most of this period, communication between the evaporator and the compressor is closed and thereafter is opened.

Abstract: A method and assembly for air conditioning a motor home vehicle or the like employing a heat transfer medium and cooling both the front passenger area and the rear living area using a single compressor source. The assembly having a compressor driven either by the vehicle's engine or a compressor driven by an electric drive motor, a first and second condenser mounted on the roof of the vehicle, a first, second and third evaporator mounted to a first, second and third blower, the first evaporator and first blower mounted under the dash of the vehicle and the second and third evaporators and second and third blowers mounted on the roof of the vehicle.

Abstract: A rotary vane compressor wherein the vane slots are used as compression chambers in a supplemental compression stage.

Abstract: A process for liquefying gaseous substances is disclosed wherein a first fluid to be liquefied is conveyed along a first path including a portion in which it is cooled. A cooling fluid is conveyed along a second path including a first section in which it is cooled, a second section in which it exchanges heat with the first fluid so as to cool the latter, and a third section thermally separated from the aforementioned first section of the second path. A precooling fluid is conveyed along a third path including a first part also thermally separated from the aforementioned first section of the second path and wherein it exchanges heat with the cooling fluid in the third section of the second path so as to be cooled thereby. The third path further includes a second part wherein the precooling fluid exchanges heat with the cooling fluid in the first section of the second path so as to cool the same.

Abstract: Disclosed are a method and apparatus for liquefying chlorine out of a gas mixture containing chlorine gas and noncondensable gases. According to the disclosed method, a multi-stage compression means is utilized for the gas mixture. The gas is compressed as it passes through the compressor series, and then it passes from the last compressor of the series to a condenser. Liquid chlorine and a second gas mixture, containing larger amounts of non-condensables, are recovered from the condenser. A bleed stream of the liquid chlorine is utilized as a refrigerant for the second gas mixture and is passed through a series of individual economizers co-current to the second gas mixture. The flow of the chlorine refrigerant and of the second gas mixture in the economizers may be countercurrent or co-current to the flow of chlorine gas in the compressors.

Abstract: A method of prevention of overheating of an electric motor for a compressor comprising the steps of introducing into the case of the electric motor of the closed type for driving the screw compressor part of the refrigerant which is introduced into an evaporator so as to cause said part of the refrigerant to expand directly therein, and permitting the expanded gas which has absorbed heat to be drawn by suction into a screw blade groove space of the screw compressor in a position in which the screw blades of the screw compressor is meshing engagement with one another have sealed gas.

Abstract: An expander compressor unit for a vapor compression refrigeration system is disclosed. The unit has a rotor which is provided with radial passageways terminating in tangentially oriented nozzles for expanding the high-pressure fluid and utilizing the kinetic energy of the expanding fluid to propel the rotor. The rotor is in driving engagement with a compressor which serves to compress fluid in the cycle. By this means the expander compressor unit substantially improves the efficiency of the cycle through efficient expansion of the refrigerant prior to evaporization and through reduction of the net work input into the system.

Abstract: A screw compressor, compressing refrigerant gas in a refrigeration system, which has liquid refrigerant passed back through it, in counter flow to the gas being compressed, for sealing the rotor clearances. The liquefied gas from the condenser of the system returns to the evaporator either wholly by way of the compressor or partly by way of the compressor as aforesaid and partly through a bypass equipped with an expansion valve.

Abstract: A variable capacity multiple compressor refrigeration system having first and second compressors with the first compressor to be always running when the system is operating and the second compressor to be cycled off or to vary the capacity of the system on while the first compressor continues to run. The discharge lines of both compressors are connected together in parallel to the system and a check valve is provided in the discharge line connection between the compressors to prevent discharge pressure from the operating compressor from entering the discharge port of the nonrunning compressor. A by-pass line connects the suction of the system at the inlet of the second compressor to its discharge line between the check valve and its discharge port and a solenoid valve in the by-pass line is arranged to be closed when the second compressor is running and open when it is cycled off.