Showing papers on "Thermal expansion valve published in 1971"

Electronic controller for automotive air conditioning system

Abstract: An automotive air conditioning system including a compressor, a condenser and an evaporator core over which air is directed and cooled for return to the passenger compartment of the car. The evaporator core is maintained at approximately 32 DEG F. by the combined control of an expansion valve between the condenser and evaporator and a suction throttling valve between the evaporator and the inlet of the compressor. The expansion valve is controlled in response to the temperature of the outlet pipe of the evaporator core and the temperature of the outlet pipe from the suction throttling valve and the flow of refrigerant is metered through the valve to keep the core full of liquid refrigerant to assure maximum cooling efficiency. The suction throttling valve is controlled by sensing the temperature of the outlet pipe from the evaporator core and controlling a throttling piston by means of a transducer for converting electrical energy into mechanical movement of the throttling piston to maintain an evaporator pressure at a constant pressure of 29.5 psi plus or minus 0.5 psi to maintain tubes and fins of the evaporator core at approximately 32 DEG F.

Absorption refrigeration system with multiple generator stages

Abstract: An air-cooled double-effect salt solution absorption refrigeration machine having high and low pressure generator stages is operated with a lower pressure in the evaporator than in the absorber. This achieves a desired low evaporator temperature while permitting the absorber to use an absorbent salt solution having a lower salt concentration and hence a lower crystallization temperature than would otherwise be necessary for the same cooling effect. In order to maintain the pressure differential between the evaporator and the absorber the vapor from the evaporator is compressed to absorber pressure before passing to the absorber. The compression is effected with an ejector device which employs refrigerant vapor flowing from the lower pressure generator stage as the driving fluid.

Air conditioner for railroad vehicles

Abstract: An air conditioner for railroad vehicles, comprising an airimpinged heating and cooling assembly the cooling system of which includes a coolant evaporator arranged in the air current and a blower-cooled condenser, wherein an additional condenser serving as a booster heater is provided in the air current behind the evaporator in such a manner as to be insertable in the cooling system via a valve system, the additional condenser by-passing at least part of the condenser of the cooling system.

Refrigeration expansion valve

Abstract: A refrigeration system has the system condenser exposed to the normal outdoor ambient temperature. The control means includes a single balanced expansion valve having a maximum port opening which is oversized as compared to that required only for normal summer operation, and the valve is actuated to provide a much larger increase in port opening under winter conditions than have heretofore been used. The result is that the system operates without adjustment or modification over an exceptionally wide range of condenser ambient temperature. The balanced valve is actuated by motor means responsive to evaporator outlet temperature and an evaporator pressure condition such as inlet or outlet pressure. The valve element may be slightly over or under balanced to provide predetermined operating characteristics.

Temperature responsive capacity control device

Abstract: A capacity control arrangement adapted for use in air conditioning systems and the like to modulate the capacity of the system for greater uniformity in temperature and humidity. The system includes a novel capacity control valve located between the expansion means and the evaporator in an air conditioning system which controls the flow of refrigerant through the evaporator, operating in response to changes in temperature. As the temperature of the air approaches the set point, part of the passes through the evaporator are closed and, as a consequence, the remaining passes run colder for greater dehumidification. An artificial control means is provided whereby the capacity control valve may be remotely controlled independently of the actual temperature of the air flowing over the evaporator.

Automatic expansion valve, in line, non-piloted

Abstract: Refrigerating apparatus for an automobile air conditioning system including an expansion valve with a tubular housing separated into a metering and a control portion by a wall separating member and having an inlet between the metering portion and the condenser and an outlet between the metering portion and the evaporator. A valve member and a passage between the inlet and outlet regulates the supply of refrigerant to the evaporator. A diaphragm within the control portion which has one side exposed to refrigerant pressure from the evaporator and the other side exposed to a reference or control pressure within a sealed chamber moves the valve to an open position in response to decreasing refrigerant pressure in the evaporator. This increases evaporator pressure above a predetermined level to prevent frost accumulation on the evaporator.

Multi-stage evaporator

Abstract: A MULTI-STAGE EVAPORATOR FOR EVAPORATING A LIQUID BY MEANS OF A HEATING FLUID COMPRISING A PLURALITY OF EVAPORATOR STAGES ARRANGED IN SERIES OF COMMUNICATION ONE ABOVE THE OTHER WHEREIN EACH STAGE INCLUDES ONE OR MORE EVAPORAING PASSAGES THROUGH WHICH THE LIQUID TO BE EVAPORATED IS CAUSED TO DESCEND, THE EVAPORATING PASSAGES BEING FLANKED BY PASSAGES TO WHICH HEATING FLUID IS SUPPLIED, THE ARRANGEMENT BEING SUCH THAT THE HEATINF FLUID CONDENSES, GIVING UP HEAT TO THE LIQUID TO BE EVAPORATED, AND CONDENSES IN RESERVOIRS WHICH ARE DIVIDED BY PARTITIONS TO FORM BAROMETRIC LEG ARRANGEMENTS. THE CONDENSED HEATING FLUDI IN THE RESERVOIRS THEREBY MAINTAINS A PRESSURE DIFFERENTIAL BETWEEN SUCCESSIVE STAGES. A COLLECTOR TRAY BENEATH EACH STAGE COLLECTS RESIDUAL UNEVAPORATED LIQUID AND DELIVERS IT TO THE EVAPORATING PASSAGES OF THE NEXT STAGE. THE TRAY ALSO COLLECTS CONDENSED HEATING FLUID OVERFLOWING FROM BAROMETRIC LEGS AND DELIVERS THIS TO THE HEATING PASSAGES OF THE NEXT STAGE. THE TRAY INCLUDES APERTURES TO ALLOW VAPOR TO PASS FROM THE EVAPORATING PASSAGES OF ONE STAGE TO THE HEATING PASSAGES OF THE NEXT STAGE.

Heating and cooling system

Abstract: A direct expansion type heating and cooling system is provided with means for supplying a heat exchange coil with proportioned mixtures of liquid refrigerant and hot refrigerant gas. Constant temperature is maintained in the conditioned area at any point from full cooling to full heating, by proportioning refrigerant condensate and hot, uncondensed refrigerant gas to the heat exchange coils. Proportioning is attained by modifying the refrigerant condensate expansion valve to move in the direction of closing in response to an increase in uncondensed refrigerant gas flow into the heat exchange coils. The amount of uncondensed refrigerant gas flow into the heat exchange coils is controlled in response to the temperature of the conditioned area. The feed to the heat exchange coils may vary between 100 percent condensate and no uncondensed refrigerant gas, to 100 percent uncondensed refrigerant gas and no condensate. Normally, a mixture of condensate and refrigerant gas is introduced into the evaporator coil. Electric resistance heaters may be used in conjunction with the heat exchange coils to supplement heating and to ''''fine tune'''' temperature controls.

Method of operating public bath and the like

Abstract: An enclosed bath system, having a bath chamber in which a body of water has its surface exposed to the air in the chamber. A heat pump, having an evaporator, a condenser and a circulating primary heat-transfer fluid carrying thermal energy absorbd at the evaporator to the condenser, circulates air from the chamber into heat-exchanging relation with the evaporator and the condenser successively whereby the evaporator abstracts heat and mositure from the circulated air and the condenser reheats the circulated air prior to its return to the chamber.

Evaporator coil refrigerant distributor

Abstract: An evaporator coil refrigerant distributor for the evaporator of an air conditioning system. The distributor has a flat face inlet for creating turbulence in the incoming liquid and gaseous refrigerant. The mixture of liquid and gaseous refrigerant must then pass through a central discharge area into a plurality of outlets which are connected to different passages of the evaporator coil.

Liquid refrigerant feed control

Abstract: The quality of the suction gas at the input of a variable capacity compressor in a refrigeration system is controlled by regulating the flow of liquid refrigerant from the condenser to the evaporator in the system. A thermistor at the input of the compressor senses the quality or gas-liquid ratio of the suction gas and controls the position of a liquid refrigerant flow valve to control the flow rate of the liquid refrigerant, thereby controlling the quality of the suction gas at the input to the compressor. The position of the liquid refrigerant flow valve may also be controlled in accordance with the capacity setting of a variable capacity compressor.

Air condition apparatus with refrigerant super cooler

Abstract: An air conditioning apparatus having an evaporator for conditioning air flowed in heat exchange relationship therewith. The evaporator is cooled by refrigerant fluid delivered thereto through an expansion means from a supply duct leading from a condenser of the refrigeration system. The refrigerant in the supply duct is supercooled by means of heat exchange relationship thereof, with condensate resulting from the condensation of the moisture in the air being conditioned by the evaporator being collected in a suitable receiver. The heat exchange relationship of the refrigerant to the condensate is such that the condensate is heated to vaporization for improved heat withdrawal from the refrigerant.

Charging method and apparatus for a refrigeration system

Abstract: A method and apparatus for accurately charging a refrigeration system having a fixed restriction refrigerant expansion device by adding or removing refrigerant to the system to obtain a preselected superheat temperature of the refrigerant leaving the evaporator coil as sensed by the difference in pressure of the refrigerant leaving the evaporator coil and the pressure of refrigerant in a refrigerant charged sensing bulb disposed in heat transfer relation with the refrigerant line leaving the evaporator.

Air conditioning system with temperature responsive controls

Abstract: An air conditioning system comprising a compressor, condenser, and evaporator includes a refrigerant bypass line for passing a portion of the heat laden high-pressure refrigerant from the compressor output into the lower heat level reduced pressure refrigerant fed to the evaporator or the suction line of the compressor A valve in the bypass line monitors the flow of the bypassed refrigerant as a function of room temperature to thereby continuously modulate the thermal capacity of the system in order to maintain room temperature relatively constant

Method and apparatus for chilling mold elements

Abstract: This disclosure relates to a method and apparatus for continuously chilling or cooling mold parts which are subjected to heated products, such as the die elements of a plastic blow molding apparatus. More particularly, the disclosed method and apparatus is adapted to maintain a predetermined mold chilling temperature to permit rapid forming of plastic articles and reduce the dwell time of the plastic article within the mold. The disclosed apparatus includes a heat exchanger-evaporator, a first liquid coolant loop communicating with the heat exchanger and the mold parts to be cooled, wherein low viscosity liquid coolant is pumped through the heat exchanger and the mold parts to chill the mold parts, and a second coolant loop communicating with the evaporator within the heat exchanger and including a compressor, condenser and expansion valve. The coolant in the second coolant loop is evaporated by the expansion valve, within the evaporator of the heat exchanger, to absorb heat from and chill the coolant within the first coolant loop.

Refrigerant cooled compressor

Abstract: In a refrigerating system including a compressor, condenser, evaporator, and an oil cooler, a refrigerant cooling system for the compressor including a bypass line connected between the condenser and evaporator, and including a pump for providing high pressure liquid to the oil cooler and to the heads of the compressors, and a return conduit connecting the discharge refrigerant from the compressor cooling system through a desuperheater in the compressor discharge line to the condenser.

Head pressure operated suction throttling valve

Abstract: Refrigerating apparatus for an automobile air conditioning system including a pressure responsive expansion valve which opens to admit refrigerant to the evaporator in response to decreasing evaporator pressure for maintaining the evaporator pressure above a minimum level to prevent frost accumulation. A flow restricting throttling valve which is normally open, moves toward a closed position in the evaporator outlet to maintain evaporator pressure when head pressure downstream from the condenser falls to a predetermined level. Because changes in head pressure are proportional to changes in ambient temperature, the restriction of the evaporator outlet with decreasing head pressure permits the system to be operated at lower ambient temperatures without evaporator pressures falling below the frost formation level.

Thermostatically controlled expansion valve for refrigerating equipment

Abstract: THE INVENTION RELATES TO A THERMOSTATICALLY CONTROLLED VALVE ASSEMBLY FOR HIGH CAPACITY REFRIGERATION EQUIPMENT. THE VALVING INCLUDES MAIN AND AUXIALIARY VALVES WITH THE AUXILIARY VALVE FUNCTIONING AS A PILOT VALVE. IN THE OPER- ATION THE MAIN VALVE MAY OCCUPY ANY INTERMEDIATE POSITION BETWEEN FULLY OPENED AND FULLY CLOSED POSITIONS.

A refrigeration system

Abstract: 1,247,580. Freezing liquids. W. S. DIXON. 12 Feb., 1969, No. 7499/69. Heading F4H. A liquid to be frozen is sprayed from sets of nozzles 20 and 21 on to the inside and outside of an annular evaporator formed of two generally cylindrical members 11 and 12 which merge together at their ends 13 and 14. The evaporator forms part of a refrigeration system including a compressor 24, a condenser 25 and an expansion valve 28, and refrigerant is supplied to the lower part of the evaporator at 27. A timer 31 opens a by-pass valve 30 to cause heating of the evaporator and harvesting of the frozen product. The evaporator is detachably suspended from a support 33. A plurality of evaporates may be connected in series and be surrounded by a common set of nozzles, Figs. 6-13 (not shown), and the expansion valve may be replaced by a capillary tube, Fig. 5 (not shown), which extends into the evaporator and which is surrounded by a harvesting hot gas line from the compressor.

Thermostatic expansion valve for refrigeration system

Abstract: A thermostatic expansion valve for use in a refrigeration system of the vapor-compression type. Valve actuation is made responsive to the combined effect of evaporator coil temperature and pressure as independently monitored through separate control inputs. A slotted ball is pivotally rotated in its seat in a direction determined by the net pressure differential applied to the control inputs to present a gradually and uniformly varying flow orifice profile. One control input monitors internal coil pressure directly while the other control input senses the gas pressure produced within a thermostatic bulb in contact with the coil exterior. Calibration means are provided to balance the net pressure differential under desired steady-state cooling conditions and position the valve accordingly.

Refrigeration system with combination capacity and compressor overload control

Abstract: A refrigeration system, and more particularly one having means for controlling against compressor overload and excess system capacity, comprising a compressor means, a condenser means connected at the output of the compressor means for condensing refrigerant discharged from the compressor means. An expansion device is connected between the output of the condenser means and the input of an evaporator means. A vortex amplifier is connected between the output of the evaporator means and the input of the compressor means, the amplifier having a main inlet and an outlet through which the refrigerant passes from the evaporator means to the compressor means, and a control inlet connected to a source of control fluid. Means are provided for varying discharge of the control fluid to the control input of the vortex amplifier in response to variations in compressor load from a prescribed load value, and to variations in system capacity from a prescribed capacity value.

Automatic expansion valve, pad mounted, non-piloted

Abstract: A pressure responsive expansion valve including a tubular member connected to the inlet and outlet of an evaporator. A wall member supported within the tubular member which separates its interior into a control chamber portion adjacent the evaporator outlet and a metering chamber portion adjacent the evaporator inlet. A diaphragm in the control portion having one side exposed to the evaporator outlet pressure and another side exposed to atmosphere and operably connected to a valve member within the metering position by a valve rod which extends through a diaphragm like seal supported by the wall member. The diaphragm is moved in response to increasing refrigerant pressure and causes the valve rod and valve member to move toward a closed position restricting refrigerant flow into the inlet of the evaporator. Likewise, the diaphragm moves in response to decreasing pressure to cause the valve member to move toward an open position thus increasing the flow of refrigerant to the evaporator inlet to maintain the evaporator pressure at a substantially constant level.

Air conditioning unit having means for providing filtered make-up air

Abstract: An air conditioning unit having a housing divided into a lower compartment containing a refrigerant condenser and condenser fan and an upper compartment containing an evaporator and a conditioned air fan, is provided with a make-up air passage in the partition dividing the two compartments. An air filter pad is positioned between an air inlet opening to the second compartment and the refrigerant evaporator so that its large area face is exposed for filtering air passing to the evaporator. The make-up air passage is disposed along the bottom side of the air filter pad so that the make-up air passes from the condenser fan upwardly through the small area bottom side of the air filter pad before passing in heat exchange relation with the refrigerant evaporator. A modified embodiment is described wherein the makeup air bypasses the refrigerant condenser.