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US2556882A - Air conditioning refrigeration system - Google Patents

Air conditioning refrigeration system Download PDF

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US2556882A
US2556882A US29974A US2997448A US2556882A US 2556882 A US2556882 A US 2556882A US 29974 A US29974 A US 29974A US 2997448 A US2997448 A US 2997448A US 2556882 A US2556882 A US 2556882A
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compressor
cooler
valve
water
load
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US29974A
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William A Minkler
Eldon H Lusk
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CBS Corp
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Westinghouse Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/026—Compressor control by controlling unloaders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/04—Compression machines, plants or systems, with several condenser circuits arranged in series

Definitions

  • This invention relates to refrigeration systems
  • land relates more particularly to air-conditioning cause excessive wear of the compressors and of the motors driving same.
  • This invention overcomes the disadvantages of the prior systems by maintaining a refrigerant compressor in constant operation down to a zero load condition; by partially unloading the compressor upon a fall in load below capacity load; and then upon a further fall in load, using heat from a condenser of the system for heating a cooling fluid supplied tothe air cooler.
  • an indirect air-cooling system has a water Chiller which supplies chilled water to the air cooler.
  • the compressor is operated continuously and, upon a predetermined reduction in load in the conditioned space, the compressor is unloaded to 50% of its capacity.
  • a portion of the water from the water chiller is heated in an auxiliary condenser whereby the temperature of the chilled water supplied to the air cooler is raised sufficiently to compensate for the reduction in load vbelow the 50% level.
  • the temperature ⁇ and the humidity in the conditioned space are maintained constant by the continuous operation of the compressor, and the wear resulting from the starting and stopping of the compressor is L uniform conditions in an air-cooled space by operating a refrigerant compressor used for cooling the air, continuously.
  • the air cooler I0 which may be a conventional vair washer or inned-tube cooler, is connected to a conventional fan I I which moves the air to be cooled through the cooler IU and discharges itv into the conditioned space.
  • the pump I2 circulates water through the air cooler I il, the heat exchanger I3 in the water chiller I4, and the three-way Valve I5.
  • the compressor i6 driven by the electric motor i'l, supp-lies refrigerant vapor through the auxiliary condenser i8, the main condenser I9, and the expansion valve 20, into the water Chiller I4 around the heat exchanger I3, the refrigerant being returned through the pipe 2
  • the compressor has the unlcader 22 which is actuated by the solenoid 24 to unload the compressor to 50% capacity when the solenoid is energized.
  • the solenoid 24 has two energizing windings' ⁇ 4I and ⁇ 42, the winding 4I being connected to energize the solenoid under control of the thermostat 23, the winding 42 being connected to energize the solenoid when the system is rst started up, as will be described.
  • the thermostat 23 is of the bellows type and has the plunger 25 carrying at its lower end the contacts 26 and 2'I which are electrically separated by the insulator 28.
  • the contact 21 is connected in series with the energizing winding of the relay 29, the solenoid 30, which adjusts the valve l5, a power supply source, which is not illustrated, and the resistor 3
  • the contacts of the relay 29 are connected in series with the power supply source, and the energizing winding lll of the solenoid 24, when the contact 2 ⁇ l'touches the resistor 3l.
  • the winding 42 of the solenoid 24 is connected in series with the power supply source, the armature 38 and the contact 39 of the switch 35 when the switch is closed to start the compressor.
  • the contact strip 32, the contact 26, the power supply source, the compressor motor I'I, the timer 49, and the contact 3l, and the armature 36 of the starter switch 35, are connected in series when the starter switch is closed.
  • the armature 38 of the switch 35 touches its contact 39 when the switch is closed, and is moved by the timer 40 away from its contact 39 a predetermined time interval after the switch is closed, for energizing the solenoid winding 42 so that the unloader 22 will unload the compressor, unless the solenoid winding 4I is energized at that time by the thermostat 23.
  • the starter switch 35 would be closed causing, through the contact of the armature 36 with the contact 31, the motor I1 to start the compressor, and causing, through the contact of the armature 38 with the contact 39, the solenoid winding 42 to be energized so it actuates the unloader 22 for unloading the compressor.
  • the power required for startingV is reduced, and wear on the compressor and-its driving motor is reduced.
  • the timer 40 After a predetermined time interval which may, by way of example, be two minutes, the timer 40 would move the armature 38 away from the contact 33 so as to deenergize the solenoid winding 42. The solenoid 24 would then adjust the unloader 22 to load the compressor 100%, unless at that time the thermostat 23 will have caused the solenoid winding 4I to be energized.
  • the thermostat 23 will not have moved the contact 21 against the resistor 3l, so that after the timer 40 has acted to cause the compressor to be 100% loaded, the compressor will continue to operate at full capacity until the load in the conditioned space has been substantially reduced, at which time the bellows of the thermostat will contract sufficiently to move the contact 31 against the resistor 3
  • the solenoid 3E would be energized causing it to adjust the valve I5 so that a portion of the chilled water from the water chiller I4 would be circulated through the condenser' I8, the condenser heating the water sufli'ciently4V to make up for the reduction in the load in the conditioned space.
  • the thermostat may move the contact 21 against the resistor 3
  • the bellows 24 would expand further so as'v to move the contact 21 further along the resistor 3l so as to reduce the value of the electric resistance in the circuit of the solenoid 30, causing the solenoid to become more strongly energized so as to adjust the valve I5 to permit more chilled water to circulate through the condenser IB.
  • every reduction in load below the rst reduction is compensated for by an increase in the amount of heat added to the air chilling water, so that the conditions in the conditioned space are maintained uniform, and the compressor is maintained continuously in operation.
  • the thermostat 23 When the temperature in the conditioned space rises, say to '17 F., so that the load in the conditioned space is such that the compressor would be called upon to operate at full capacity, the thermostat 23 will have movedA the contact 21 away from the resistor 3I, sc that the valve I5 would be so adjusted that no chilled water would be circulated through the condenser E3.
  • a refrigeration system comprising a refrigerant compressor, a condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water' chiller and said cooler in a water circuit when said valve is adjusted to one position, and connecting said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position.
  • a refrigeration system comprising a refrigerant compressor, a condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said cooler in a water circuit when said valve is adjusted toone position, and connecting' said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; an unloader for said compressor; and means responsive to a reduction inthe load on said cooler' for adjusting said valve to said second position, and for actuating said unloader ⁇ for partially unloading said? compressor.
  • a refrigeration systeml comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler connected to said water chiller for receiving water therefrom; an unloader for said compressor; and means responsive to a reduction in the load on said cooler for actuating said unloader for partially unloading said compressor, and for routing the chilled water from said chiller in heat exchange relationship with said auxiliary condenser.
  • a refrigeration system comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said cooler in a water circuit when said valve is adjusted' to one'position, and connecting said water chiller, said auxiliary condenser, and said cooler in a water circuit when said valve is adjusted to a second position and means responsive to a rcduotion in the load on said cooler for adjusting said valve to said second position.
  • a refrigeration system comprising a refrigerant compressor, a main condenser, auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said, cooler in a water circuit when said valve is adjusted to one position, and connecting said water chiller, said auxiliary condenser, and said cooler in a Water circuit when said valve is adjusted to a second position; an unloader for said compressor; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position, and for actuating said unloader for partially unloading said compressor.
  • a refrigeration system comprising a refrig-A erant compressor, a condenser, and a Water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said cooler in a Water circuit When said valve is adjusted to one position, and connecting said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; means responsive to a reduction in the load on said cooler for adjustingsaid valve to said second position, and means responsive to further reductions in the load on said cooler for adjusting said valve for varying the volume of water circulated through said condenser conformably with the reduction in load.
  • a refrigeration system comprising a refrigerant compressor, a condenser, and a water chiller -connected in a refrigerant circuit; a cooler;
  • means including a valve connecting said water chiller and said cooler in a Water circuit when said valve is adjusted to one position, andconnecting said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; an unloader for said compressor; means responsive to a reduction in the load in the space served by said cooler for actuating said unloader for partially unloading said compressor and for adjusting said valve to said second position, and means responsive to further reductions in said load for adjusting said valve for varying the volume of Water circulated through said condenser condenser conformably with the reduction in load.
  • a refrigeration system comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a Water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said Water chiller and said cooler in a water circuit when said valve is adjusted to one position, and connecting said Water chiller, said auxiliary condenser, and said cooler in a water circuit when said valve is adjusted to a second position; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position, and means responsive to further reductions in said load for adjusting said Valve for varying the volume of water circulated through said condenser conformably with the reduction in load.
  • a refrigeration system comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said Water chiller and said cooler in a Water circuit when said valve is adjusted to one position, and connecting said water Chiller, said auxiliary condenser, and said cooler in a Water circuit When said valve is adjusted to a second position; an unloader for said compressor; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position, and for actuating said unloader for partially unloading said compressor, and means responsive to further reductions in said load for adjusting said valve for varying the volume of Water circulated through said condenser confprmably with the reduction in load.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Description

Jun 12, 1951 w. A. MINKLER ETAL AIR CONDITIONING REFRIGERATION SYSTEM Filed May 29, 1948 All' INVENTORS wlLLlAM A. M|NKLER+ ELDON H. LUSK ATTORNEY Patented June 12,. 1951 5seen Uhll'l'ED STATES RATEN' OFFlCE AIR CONDITIONING REFRIGERATION SYSTEM William A. Minklcr, Elmhurst, Ill., and Eldon H.
Lusk, East Paterson, N. J., assignors to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of iennsylvania Application May 29, 1948, Serial No. 29,974
9 Claims.
This invention relates to refrigeration systems,
land relates more particularly to air-conditioning cause excessive wear of the compressors and of the motors driving same.
This invention overcomes the disadvantages of the prior systems by maintaining a refrigerant compressor in constant operation down to a zero load condition; by partially unloading the compressor upon a fall in load below capacity load; and then upon a further fall in load, using heat from a condenser of the system for heating a cooling fluid supplied tothe air cooler.
In one embodiment of the invention, an indirect air-cooling system has a water Chiller which supplies chilled water to the air cooler. The compressor is operated continuously and, upon a predetermined reduction in load in the conditioned space, the compressor is unloaded to 50% of its capacity. Upon a further reduction in the load in the conditioned space, a portion of the water from the water chiller is heated in an auxiliary condenser whereby the temperature of the chilled water supplied to the air cooler is raised sufficiently to compensate for the reduction in load vbelow the 50% level. Thus, the temperature `and the humidity in the conditioned space are maintained constant by the continuous operation of the compressor, and the wear resulting from the starting and stopping of the compressor is L uniform conditions in an air-cooled space by operating a refrigerant compressor used for cooling the air, continuously.
The invention will now be described with reference to the drawing which is a diagrammatic View of an air-conditioning system using an indirect reirigeration system for cooling the air.
The air cooler I0, which may be a conventional vair washer or inned-tube cooler, is connected to a conventional fan I I which moves the air to be cooled through the cooler IU and discharges itv into the conditioned space.
The pump I2 circulates water through the air cooler I il, the heat exchanger I3 in the water chiller I4, and the three-way Valve I5.
The compressor i6, driven by the electric motor i'l, supp-lies refrigerant vapor through the auxiliary condenser i8, the main condenser I9, and the expansion valve 20, into the water Chiller I4 around the heat exchanger I3, the refrigerant being returned through the pipe 2| to the suction side of the compressor.
The compressor has the unlcader 22 which is actuated by the solenoid 24 to unload the compressor to 50% capacity when the solenoid is energized. Y
The solenoid 24 has two energizing windings'` 4I and` 42, the winding 4I being connected to energize the solenoid under control of the thermostat 23, the winding 42 being connected to energize the solenoid when the system is rst started up, as will be described.
The thermostat 23 is of the bellows type and has the plunger 25 carrying at its lower end the contacts 26 and 2'I which are electrically separated by the insulator 28. The contact 21 is connected in series with the energizing winding of the relay 29, the solenoid 30, which adjusts the valve l5, a power supply source, which is not illustrated, and the resistor 3| when the contact 2l is in contact with the resistor. Y
The contacts of the relay 29 are connected in series with the power supply source, and the energizing winding lll of the solenoid 24, when the contact 2`l'touches the resistor 3l.
The winding 42 of the solenoid 24 is connected in series with the power supply source, the armature 38 and the contact 39 of the switch 35 when the switch is closed to start the compressor.
The contact strip 32, the contact 26, the power supply source, the compressor motor I'I, the timer 49, and the contact 3l, and the armature 36 of the starter switch 35, are connected in series when the starter switch is closed.
The armature 38 of the switch 35, touches its contact 39 when the switch is closed, and is moved by the timer 40 away from its contact 39 a predetermined time interval after the switch is closed, for energizing the solenoid winding 42 so that the unloader 22 will unload the compressor, unless the solenoid winding 4I is energized at that time by the thermostat 23.
To start the system, the starter switch 35 would be closed causing, through the contact of the armature 36 with the contact 31, the motor I1 to start the compressor, and causing, through the contact of the armature 38 with the contact 39, the solenoid winding 42 to be energized so it actuates the unloader 22 for unloading the compressor. By starting the compressor partially unloaded, the power required for startingV is reduced, and wear on the compressor and-its driving motor is reduced.
After a predetermined time interval which may, by way of example, be two minutes, the timer 40 would move the armature 38 away from the contact 33 so as to deenergize the solenoid winding 42. The solenoid 24 would then adjust the unloader 22 to load the compressor 100%, unless at that time the thermostat 23 will have caused the solenoid winding 4I to be energized.
Ordinarily, when the system is iirst started up, the thermostat 23 will not have moved the contact 21 against the resistor 3l, so that after the timer 40 has acted to cause the compressor to be 100% loaded, the compressor will continue to operate at full capacity until the load in the conditioned space has been substantially reduced, at which time the bellows of the thermostat will contract sufficiently to move the contact 31 against the resistor 3|.
This would cause the relay 29 to be energized so that it would close the circuit from the power supply to the winding 4I of the solenoid 2 of the unloader 22, causing the solenoid to be energizedv and to unload the compressor to 50% capacity.
At the saine time, the solenoid 3E would be energized causing it to adjust the valve I5 so that a portion of the chilled water from the water chiller I4 would be circulated through the condenser' I8, the condenser heating the water sufli'ciently4V to make up for the reduction in the load in the conditioned space.
By way of example, the thermostat may move the contact 21 against the resistor 3| when the temperature in the conditioned space falls below'76" F.
As the load in the conditioned space continues to decrease, the bellows 24 would expand further so as'v to move the contact 21 further along the resistor 3l so as to reduce the value of the electric resistance in the circuit of the solenoid 30, causing the solenoid to become more strongly energized so as to adjust the valve I5 to permit more chilled water to circulate through the condenser IB. Thus, every reduction in load below the rst reduction is compensated for by an increase in the amount of heat added to the air chilling water, so that the conditions in the conditioned space are maintained uniform, and the compressor is maintained continuously in operation.
When the temperature in the conditioned space rises, say to '17 F., so that the load in the conditioned space is such that the compressor would be called upon to operate at full capacity, the thermostat 23 will have movedA the contact 21 away from the resistor 3I, sc that the valve I5 would be so adjusted that no chilled water would be circulated through the condenser E3.
During the contraction of the thermostat bel- `lows caused by load reductions, the contact 25 will slide along the strip 32 causing the compressor to remain continuously in operation throughout the entire load range. At zero load, when there would be no need for cooling, the
4 I contact 23 would move below the strip 32, thus opening the circuit of the motor I1 and stopping the compressor.
While one embodiment of the invention has been described for the purpose of illustration, it should be understood that the invention is not limited to the exact apparatus and the arrangement of apparatus illustrated, as modifications thereof may be suggested by those skilled in the art withoutdeparture from the essence of the invention.
What is claimed is:
l. A refrigeration system comprising a refrigerant compressor, a condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water' chiller and said cooler in a water circuit when said valve is adjusted to one position, and connecting said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position.
2. A refrigeration system comprising a refrigerant compressor, a condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said cooler in a water circuit when said valve is adjusted toone position, and connecting' said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; an unloader for said compressor; and means responsive to a reduction inthe load on said cooler' for adjusting said valve to said second position, and for actuating said unloader `for partially unloading said? compressor.
3. A refrigeration systeml comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler connected to said water chiller for receiving water therefrom; an unloader for said compressor; and means responsive to a reduction in the load on said cooler for actuating said unloader for partially unloading said compressor, and for routing the chilled water from said chiller in heat exchange relationship with said auxiliary condenser.
4. A refrigeration system comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said cooler in a water circuit when said valve is adjusted' to one'position, and connecting said water chiller, said auxiliary condenser, and said cooler in a water circuit when said valve is adjusted to a second position and means responsive to a rcduotion in the load on said cooler for adjusting said valve to said second position.
5. A refrigeration system comprising a refrigerant compressor, a main condenser, auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said, cooler in a water circuit when said valve is adjusted to one position, and connecting said water chiller, said auxiliary condenser, and said cooler in a Water circuit when said valve is adjusted to a second position; an unloader for said compressor; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position, and for actuating said unloader for partially unloading said compressor.
assassa 6. A refrigeration system comprising a refrig-A erant compressor, a condenser, and a Water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said water chiller and said cooler in a Water circuit When said valve is adjusted to one position, and connecting said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; means responsive to a reduction in the load on said cooler for adjustingsaid valve to said second position, and means responsive to further reductions in the load on said cooler for adjusting said valve for varying the volume of water circulated through said condenser conformably with the reduction in load.
7. A refrigeration system comprising a refrigerant compressor, a condenser, and a water chiller -connected in a refrigerant circuit; a cooler;
means including a valve connecting said water chiller and said cooler in a Water circuit when said valve is adjusted to one position, andconnecting said water chiller, said condenser, and said cooler in a water circuit when said valve is adjusted to a second position; an unloader for said compressor; means responsive to a reduction in the load in the space served by said cooler for actuating said unloader for partially unloading said compressor and for adjusting said valve to said second position, and means responsive to further reductions in said load for adjusting said valve for varying the volume of Water circulated through said condenser condenser conformably with the reduction in load.
8. A refrigeration system comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a Water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said Water chiller and said cooler in a water circuit when said valve is adjusted to one position, and connecting said Water chiller, said auxiliary condenser, and said cooler in a water circuit when said valve is adjusted to a second position; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position, and means responsive to further reductions in said load for adjusting said Valve for varying the volume of water circulated through said condenser conformably with the reduction in load.
9. A refrigeration system comprising a refrigerant compressor, a main condenser, an auxiliary condenser, and a water chiller connected in a refrigerant circuit; a cooler; means including a valve connecting said Water chiller and said cooler in a Water circuit when said valve is adjusted to one position, and connecting said water Chiller, said auxiliary condenser, and said cooler in a Water circuit When said valve is adjusted to a second position; an unloader for said compressor; and means responsive to a reduction in the load on said cooler for adjusting said valve to said second position, and for actuating said unloader for partially unloading said compressor, and means responsive to further reductions in said load for adjusting said valve for varying the volume of Water circulated through said condenser confprmably with the reduction in load.
WILLIAM A. MINKLER. ELDON H. LUSK.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,980,688 Lewis Nov. 13, 1934 2,152,250 Gay Mar. 28, 1939 2,160,389 Palmer May 30, 1939 2,187,397 Goggins Jan. 16, 1940 2,223,725 Heitchue Dec. 3, 1940
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Cited By (15)

* Cited by examiner, † Cited by third party
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US2739451A (en) * 1952-09-30 1956-03-27 Carrier Corp Refrigeration system provided with compressor unloading mechanism
US2765629A (en) * 1946-02-02 1956-10-09 Carrier Corp Refrigerant expansion control
US2982523A (en) * 1956-01-24 1961-05-02 Alden I Mcfarlan Air conditioning system
US3199306A (en) * 1964-06-05 1965-08-10 Worthington Corp Time delay for compressor motor circuit
US4398397A (en) * 1981-04-27 1983-08-16 Penjerdel Refrigeration Co., Inc. Self-balancing two stage heat recovery system
US4474022A (en) * 1982-12-30 1984-10-02 Standard Oil Company Ambient air assisted cooling system
US4476692A (en) * 1981-07-17 1984-10-16 Nippondenso Co., Ltd. Automotive refrigeration system
US4480443A (en) * 1981-04-30 1984-11-06 Nippondenso Co., Ltd. Automotive refrigeration system
US4537042A (en) * 1981-04-30 1985-08-27 Nippondenso Co., Ltd. Automotive refrigeration system
US4539821A (en) * 1982-02-20 1985-09-10 Sanden Corporation Capacity control device for controlling a variable displacement compressor in an air conditioning system
US4539823A (en) * 1981-03-27 1985-09-10 Nippondenso Co., Ltd. Refrigeration system
US4769998A (en) * 1986-04-25 1988-09-13 Advantage Electronics, Incorporated Precision-controlled water chiller
US4802338A (en) * 1986-04-25 1989-02-07 Advantage Engineering Incorporated Precision-controlled water chiller
US4850201A (en) * 1986-04-25 1989-07-25 Advantage Engineering Incorporated Precision-controlled water chiller
US20080173035A1 (en) * 2007-01-22 2008-07-24 Thayer Daniel D Split system dehumidifier

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US1980688A (en) * 1930-05-29 1934-11-13 Lewis Air Conditioners Inc Air conditioning and refrigeration system
US2152250A (en) * 1935-09-03 1939-03-28 Norman H Gay Continuous cycle heating and cooling system
US2160389A (en) * 1938-01-12 1939-05-30 B F Sturtevant Co Air conditioning system
US2187397A (en) * 1937-09-07 1940-01-16 Interstate Transit Lines Air conditioning apparatus
US2223725A (en) * 1939-06-28 1940-12-03 Westinghouse Electric & Mfg Co Control mechanism

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US1980688A (en) * 1930-05-29 1934-11-13 Lewis Air Conditioners Inc Air conditioning and refrigeration system
US2152250A (en) * 1935-09-03 1939-03-28 Norman H Gay Continuous cycle heating and cooling system
US2187397A (en) * 1937-09-07 1940-01-16 Interstate Transit Lines Air conditioning apparatus
US2160389A (en) * 1938-01-12 1939-05-30 B F Sturtevant Co Air conditioning system
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Cited By (15)

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US2765629A (en) * 1946-02-02 1956-10-09 Carrier Corp Refrigerant expansion control
US2739451A (en) * 1952-09-30 1956-03-27 Carrier Corp Refrigeration system provided with compressor unloading mechanism
US2982523A (en) * 1956-01-24 1961-05-02 Alden I Mcfarlan Air conditioning system
US3199306A (en) * 1964-06-05 1965-08-10 Worthington Corp Time delay for compressor motor circuit
US4539823A (en) * 1981-03-27 1985-09-10 Nippondenso Co., Ltd. Refrigeration system
US4398397A (en) * 1981-04-27 1983-08-16 Penjerdel Refrigeration Co., Inc. Self-balancing two stage heat recovery system
US4537042A (en) * 1981-04-30 1985-08-27 Nippondenso Co., Ltd. Automotive refrigeration system
US4480443A (en) * 1981-04-30 1984-11-06 Nippondenso Co., Ltd. Automotive refrigeration system
US4476692A (en) * 1981-07-17 1984-10-16 Nippondenso Co., Ltd. Automotive refrigeration system
US4539821A (en) * 1982-02-20 1985-09-10 Sanden Corporation Capacity control device for controlling a variable displacement compressor in an air conditioning system
US4474022A (en) * 1982-12-30 1984-10-02 Standard Oil Company Ambient air assisted cooling system
US4769998A (en) * 1986-04-25 1988-09-13 Advantage Electronics, Incorporated Precision-controlled water chiller
US4802338A (en) * 1986-04-25 1989-02-07 Advantage Engineering Incorporated Precision-controlled water chiller
US4850201A (en) * 1986-04-25 1989-07-25 Advantage Engineering Incorporated Precision-controlled water chiller
US20080173035A1 (en) * 2007-01-22 2008-07-24 Thayer Daniel D Split system dehumidifier

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