US2434593A - Refrigeration system including a load control apparatus - Google Patents

Refrigeration system including a load control apparatus Download PDF

Info

Publication number
US2434593A
US2434593A US645185A US64518546A US2434593A US 2434593 A US2434593 A US 2434593A US 645185 A US645185 A US 645185A US 64518546 A US64518546 A US 64518546A US 2434593 A US2434593 A US 2434593A
Authority
US
United States
Prior art keywords
expansion valve
condenser
refrigeration system
evaporator
refrigerant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US645185A
Inventor
Edward L Schulz
Edward A Bailey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Priority to US645185A priority Critical patent/US2434593A/en
Application granted granted Critical
Publication of US2434593A publication Critical patent/US2434593A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
    • F25B41/335—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant via diaphragms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • This invention relates to the art of refrigera tion and more particularly to a control arrangement for regulating the production of refrigera tion effect, the control arrangement being responsive to variations in load-conditions to compensate for conditions of overload arising from unforeseen causes.
  • the chief object of the present invention is to provide a simple and ready control means for preventing the passage of refrigerant to the evaporator of a refrigeration system whenever load conditions result in undesirably high condenser pressure.
  • An object of the present invention is to provide a simple control means for refrigeration systems used in transportation vehicles for air conditioning which operates automatically upon the failure of condenser cooling to prevent damage to the refrigeration system.
  • a further object is to provide a refrigeration system embodying control means responsive to an increase in condenser pressure above a predetermined maximum which functions to prevent passage of refrigerant to the evaporator in cases where the system is unable to function effectively, and in which the system may be damaged or become inoperative by the failure of certain elements thereof.
  • a still further object is to provide a refrigeration system including a solenoid type valve in the discharge ,line disposed between the receiver and the expansion valve, the valveunder normal conditions remaining in open position and permitting free passage of refrigerant to the expansion valve and evaporator whilebeing actuated in response to excessive condensing pressure to move toward a closed position thus preventing the passage of refrigerant to the expansion valve.
  • a vstill further object is to provide a simple control for use in refrigeration systems in which is connected to discharge line 1 ing the flow of refrigerant erated and in which it is desired to prevent the passage of refrigerant to the evaporator under conditions of inefllcient or ineffective operation.
  • a still further object is to provide a refrigeration system for use in transportation vehicles for air conditioning in which thecom'pressor of the system is continuously operated and simple, efficient control means are provided to prevent the passage of refrigerant to the evaporator of the system under conditions in which the system is unable to function effectively.
  • This invention relates to a refrigeration system including in combination a compressor, a condenser, an expansion valve and an evaporator disposed in a closed circuit.
  • a solenoid valve is disposed in the circuit between the condenser and the expansion valve and preferably between the receiver and the expansion valve.
  • the solenoid valve is operable in response to a circuit breaker which is actuated by an increase in condenser pressure above a predetermined maximum.
  • An increase in condenser pressure above a predetermined maximum actuates the solenoid valve to move it toward a closed position thus discontinuto the expansion valve and the evaporator.
  • compressor 2 preferably of type although it may nected to a condenser 3 by a line 4.
  • Refrigerant from condenser 3 flows through line 5 to receiver 6.
  • 'Discharge line I connects receiver 6 with an of the invention.
  • Evaporator 8 is connected to compressor 2 by suction line ill.
  • Condenser 3 may be air orvwater cooled as desired; as illustrated it may be air cooled by means of a suitable fan.
  • Expansion valve 9 is actuated in the usual manner by means of a. bulb ll disposed adjacent the discharge end of evaporator 8.
  • An equalizing line 12 extends between valve 9 and suction line Ill and serves to providexa pressure under the diaphragm of expansion valve 9 equal to the pressure at the discharge end of evaporator .8.
  • a control valve I3 is disposed in line 1 at a point preferably between receiver 6 and expansion valve 9.
  • Control valve l3 may be a solenoid valve operable by means of coil H.
  • a circuit breaker designated generally at I5 is provided.
  • a diaphragm l6 forming a portion of member I5 through line l1 the compressor of thesgstemjsgontinuously opand is responsive to condenser pressure in line he of any desired type con- I 1.
  • x switch n is provided adapted to be moved to open and closed positions.
  • Leads i8 and II are provided, lead i8 extending from a source of supply to switch point 20, while lead it extends from the source of supply to coil 14.
  • a second switch point It It is connected to coil ll by line 22.
  • An increase in condenser pressure above a predetermined level flexes diaphragm it, moving switch [8 out of contact with switch point 2
  • the increase in condenser pressure above a predetermined maximum prevents the passage of refrigerant to the evapo- -rator and obviates damage to the system which might result.
  • the control is automatic and consequently upon a decrease in condenser pressure the valve is actuated to open discharge line I permitting free passage of refrigerant to expansion valve 9.
  • the present invention provides a simple and inexpensive means of control to prevent damage to arefrigeration system.
  • the control means so provided is particularly desirable for use in refrigeration systems designed to be used in air conditioning applications such as transportation vehicles and the like.
  • the control arrangement is responsive to condenser pressure above a predetermined level and operates automatically to prevent passage of refrigerant to the evaporator under conditions which might result in damage to the refrigeration system.
  • the control arrangement is readily installed in existing systems and is of particular advantage when used in connection with refrigeration systems for buses.
  • a compressor a condenser connected to the compressor, an expansion valve, a discharge line connecting the expansion valve and the condenser, an evaporator connected to the expansion valve, a suction line connecting the evaporator and the compressor, means disposed adjacent the suction line for governing operation of the expansion valve, a solenoid valve disposed in the discharge line adapted to prevent passage of refrigerant to the expansion valve, and means to operate the solenoid valve in response to an increase in condenser pressure above a predetermined level.
  • a compressor connected to the compressor.
  • an expansion valve connecting the expansion valve and the condenser
  • an evaporator connected to the expansion valve
  • a suction line connecting the evaporator and the compressor
  • a solenoid valve disposed in the discharge line
  • means for actuating the solenoid valve said'means being responsive to an increase in condenser pressure above a predetermined level, an increase in condenser pressure above a predetermined level actuating said means to move the solenoid valve to a closed position preventing passage of refrigerant to the expansion valve.
  • a compressor a condenser connected to the compressor, an expansion valve, a discharge line connecting the expansion valve and the condenser, an evaporator connected to the expansionvalve, a suction line connecting the evaporator and the compressor, a solenoid valve disposed in the discharge line, and means for actuating the solenoid valve
  • said means including a circuit closing member, a diaphragm member to move said member to open and to close the circuit, and a line connecting the diaphragm member with the discharge line, the juncture of said line with the discharge line being disposed between the expansion valve and the condenser, an increase in pressure in the discharge line above a predetermined level actuating said diaphragm member to operate the circuit closing member thus tending to move the solenoid valve toward a closed position to prevent passage of refrigerant to the expansion valve.

Description

'Jan. 13, 1948. E. LI S.CHULZ El AL 2,434,593
REFRIGERATION SYSTEM INCLUDING A LOAD CQNTROL APPARATUS Filed Feb. 2,- 1 946 INVENTOR. 4 JJL; Ml
y WA'M? Patented Jan. 13, 1948 REFRIGERATION SYSTEM INCLUDING A LOAD CONTROL APPARATUS Lakewood, Ohio, and Edward Edward L. Schulz,
A. Bailey, Marietta,
Corporation, Syracuse, N. 1.,
Delaware N. Y., assignors to, Carrier a corporation of Application February 2, 1946, Serial No. 645,185 3 Claims. (01. 62-2) This invention relates to the art of refrigera tion and more particularly to a control arrangement for regulating the production of refrigera tion effect, the control arrangement being responsive to variations in load-conditions to compensate for conditions of overload arising from unforeseen causes.
In air conditioning systems such as those used to condition buses, railway cars, etc., in which the compressor of the refrigeration system is driven directly from the engine of the bus, or a wheel of the car, it is desirable to provide somecontrol means to prevent inefficient and ineffective operation of the system under conditions-oi overload. In some systems heretofore used, a high pressure cut-out has been provided for such purpose, the cut-out serving to discontinue operation of the compressor until the undesirable con ditions have been remedied. It will be appreciated, however, in systems where'the compressor is driven directly, such cut-outs cannot be used.
The chief object of the present invention is to provide a simple and ready control means for preventing the passage of refrigerant to the evaporator of a refrigeration system whenever load conditions result in undesirably high condenser pressure.
An object of the present invention is to provide a simple control means for refrigeration systems used in transportation vehicles for air conditioning which operates automatically upon the failure of condenser cooling to prevent damage to the refrigeration system. V
A further object is to provide a refrigeration system embodying control means responsive to an increase in condenser pressure above a predetermined maximum which functions to prevent passage of refrigerant to the evaporator in cases where the system is unable to function effectively, and in which the system may be damaged or become inoperative by the failure of certain elements thereof.
A still further object is to provide a refrigeration system including a solenoid type valve in the discharge ,line disposed between the receiver and the expansion valve, the valveunder normal conditions remaining in open position and permitting free passage of refrigerant to the expansion valve and evaporator whilebeing actuated in response to excessive condensing pressure to move toward a closed position thus preventing the passage of refrigerant to the expansion valve.
A vstill further object is to provide a simple control for use in refrigeration systems in which is connected to discharge line 1 ing the flow of refrigerant erated and in which it is desired to prevent the passage of refrigerant to the evaporator under conditions of inefllcient or ineffective operation.
A still further object is to provide a refrigeration system for use in transportation vehicles for air conditioning in which thecom'pressor of the system is continuously operated and simple, efficient control means are provided to prevent the passage of refrigerant to the evaporator of the system under conditions in which the system is unable to function effectively.
This invention relates to a refrigeration system including in combination a compressor, a condenser, an expansion valve and an evaporator disposed in a closed circuit. A solenoid valve is disposed in the circuit between the condenser and the expansion valve and preferably between the receiver and the expansion valve. The solenoid valve is operable in response to a circuit breaker which is actuated by an increase in condenser pressure above a predetermined maximum. An increase in condenser pressure above a predetermined maximum actuates the solenoid valve to move it toward a closed position thus discontinuto the expansion valve and the evaporator.
The attached drawing illustrates diagrammatically a preferred embodiment Referring to the drawing, compressor 2 preferably of type although it may nected to a condenser 3 by a line 4. Refrigerant from condenser 3 flows through line 5 to receiver 6. 'Discharge line I connects receiver 6 with an of the invention.
there is shown a the reciprocating evaporator 8. An expansion valve 9 of the usual type well known in the art is disposed in discharge line I. Evaporator 8 is connected to compressor 2 by suction line ill. Condenser 3 may be air orvwater cooled as desired; as illustrated it may be air cooled by means of a suitable fan. Expansion valve 9 is actuated in the usual manner by means of a. bulb ll disposed adjacent the discharge end of evaporator 8. An equalizing line 12 extends between valve 9 and suction line Ill and serves to providexa pressure under the diaphragm of expansion valve 9 equal to the pressure at the discharge end of evaporator .8.
A control valve I3 is disposed in line 1 at a point preferably between receiver 6 and expansion valve 9. Control valve l3 may be a solenoid valve operable by means of coil H. A circuit breaker designated generally at I5 is provided. A diaphragm l6 forming a portion of member I5 through line l1 the compressor of thesgstemjsgontinuously opand is responsive to condenser pressure in line he of any desired type con- I 1. x switch n is provided adapted to be moved to open and closed positions. Leads i8 and II are provided, lead i8 extending from a source of supply to switch point 20, while lead it extends from the source of supply to coil 14. A second switch point It is connected to coil ll by line 22. An increase in condenser pressure above a predetermined level flexes diaphragm it, moving switch [8 out of contact with switch point 2| opening the circuit and permitting valve I3 to close to prevent passage of refrigerant to expansion valve 8.
When condenser pressure again decreases to the predetermined level diaphragm it closes the circuit by engaging switch i8 with switch point 2| opening valve [3 to permit free passage of refrigerant to expansion valve 9.
In the normal operation of the refrigeration system of my invention free passage of refrigerant is permitted to expansion valve 9 and evaporator 8 in accordance with the load imposed upon the system. Assuming pressure in discharge line I (condensing pressure) exceeds a predetermined maximum of say 200 pounds, such pressure is exerted through line H against diaphragm l8. Flexing of diaphragm l8 actuates circuit breaker l and serves automatically to close solenoid valve I3. If the fault in the system is due to impaired condensing action, such as a break-down of the condenser fan or a failure of water if the condenser be water cooled, the increase in condenser pressure above a predetermined maximum prevents the passage of refrigerant to the evapo- -rator and obviates damage to the system which might result. The control is automatic and consequently upon a decrease in condenser pressure the valve is actuated to open discharge line I permitting free passage of refrigerant to expansion valve 9.
In our co-pending applications, Serial Nos. 645,183, 645,184 and 645,186, filed February 2, 1946, February 2, 1946, and February 2, 1946, respectively, we have disclosed certain control means for modulating the action of the expansion valve in response to excessive loads imposed upon the system or in response to partial load conditions. It will be appreeiated'the present invention may be used in conjunction with the control arrangements disclosed in our co-pending applications if desired, or the present invention may be used alone in a refrigeration system to obviate harmful effects to the system which might result from operation under conditions of overload.
The present invention provides a simple and inexpensive means of control to prevent damage to arefrigeration system. The control means so provided is particularly desirable for use in refrigeration systems designed to be used in air conditioning applications such as transportation vehicles and the like. The control arrangement is responsive to condenser pressure above a predetermined level and operates automatically to prevent passage of refrigerant to the evaporator under conditions which might result in damage to the refrigeration system. The control arrangement is readily installed in existing systems and is of particular advantage when used in connection with refrigeration systems for buses.
While we have described and illustrated a preferred embodiment of our invention, it will be 4 understood our invention is not limited thereto since it may be otherwise embodied within the scope of the following claims.
We claim:
1. In a refrigeration system. the combination of a compressor. a condenser connected to the compressor, an expansion valve, a discharge line connecting the expansion valve and the condenser, an evaporator connected to the expansion valve, a suction line connecting the evaporator and the compressor, means disposed adjacent the suction line for governing operation of the expansion valve, a solenoid valve disposed in the discharge line adapted to prevent passage of refrigerant to the expansion valve, and means to operate the solenoid valve in response to an increase in condenser pressure above a predetermined level.
2. In a refrigeration system, the combination of a compressor, a condenser connected to the compressor. an expansion valve, a discharge line connecting the expansion valve and the condenser, an evaporator connected to the expansion valve, a suction line connecting the evaporator and the compressor, means disposed adjacent the suction line for governing operation of the expansion valve, a solenoid valve disposed in the discharge line, means for actuating the solenoid valve, said'means being responsive to an increase in condenser pressure above a predetermined level, an increase in condenser pressure above a predetermined level actuating said means to move the solenoid valve to a closed position preventing passage of refrigerant to the expansion valve.
3. In a refrigeration system, the combination of a compressor, a condenser connected to the compressor, an expansion valve, a discharge line connecting the expansion valve and the condenser, an evaporator connected to the expansionvalve, a suction line connecting the evaporator and the compressor, a solenoid valve disposed in the discharge line, and means for actuating the solenoid valve, said means including a circuit closing member, a diaphragm member to move said member to open and to close the circuit, and a line connecting the diaphragm member with the discharge line, the juncture of said line with the discharge line being disposed between the expansion valve and the condenser, an increase in pressure in the discharge line above a predetermined level actuating said diaphragm member to operate the circuit closing member thus tending to move the solenoid valve toward a closed position to prevent passage of refrigerant to the expansion valve.
EDWARD L. SCHULZ. EDWARD A. BAILEY.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS
US645185A 1946-02-02 1946-02-02 Refrigeration system including a load control apparatus Expired - Lifetime US2434593A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US645185A US2434593A (en) 1946-02-02 1946-02-02 Refrigeration system including a load control apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US645185A US2434593A (en) 1946-02-02 1946-02-02 Refrigeration system including a load control apparatus

Publications (1)

Publication Number Publication Date
US2434593A true US2434593A (en) 1948-01-13

Family

ID=24587968

Family Applications (1)

Application Number Title Priority Date Filing Date
US645185A Expired - Lifetime US2434593A (en) 1946-02-02 1946-02-02 Refrigeration system including a load control apparatus

Country Status (1)

Country Link
US (1) US2434593A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614393A (en) * 1946-02-02 1952-10-21 Carrier Corp Art of refrigeration
US2707868A (en) * 1951-06-29 1955-05-10 Goodman William Refrigerating system, including a mixing valve
US2739450A (en) * 1952-09-30 1956-03-27 Carrier Corp Refrigeration system provided with compressor unloading mechanism
US2739451A (en) * 1952-09-30 1956-03-27 Carrier Corp Refrigeration system provided with compressor unloading mechanism
US2874550A (en) * 1955-05-19 1959-02-24 Keeprite Products Ltd Winter control valve arrangement in refrigerating system
US4286438A (en) * 1980-05-02 1981-09-01 Whirlpool Corporation Condition responsive liquid line valve for refrigeration appliance
US5600962A (en) * 1993-11-12 1997-02-11 Sanyo Electric Co., Ltd. Air conditioner
US6053000A (en) * 1999-01-15 2000-04-25 Levitin; Mikhail Refrigeration unit
US20090031738A1 (en) * 2005-05-06 2009-02-05 Tomoichiro Tamura Refrigerating machine
US20170307260A1 (en) * 2016-04-18 2017-10-26 Johnson Controls Technology Company Condenser evaporator system for refrigeration systems

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091787A (en) * 1935-09-28 1937-08-31 Baldwin Southwark Corp Expansion valve mechanism for refrigerating systems
US2196778A (en) * 1939-09-05 1940-04-09 Johnson Service Co Refrigeration
US2249856A (en) * 1933-12-19 1941-07-22 Auditorium Conditioning Corp Air conditioning
US2313391A (en) * 1940-09-28 1943-03-09 Honeywell Regulator Co Refrigerating system
US2415338A (en) * 1945-04-20 1947-02-04 Detroit Lubricator Co Refrigeration system and expansion valve therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2249856A (en) * 1933-12-19 1941-07-22 Auditorium Conditioning Corp Air conditioning
US2091787A (en) * 1935-09-28 1937-08-31 Baldwin Southwark Corp Expansion valve mechanism for refrigerating systems
US2196778A (en) * 1939-09-05 1940-04-09 Johnson Service Co Refrigeration
US2313391A (en) * 1940-09-28 1943-03-09 Honeywell Regulator Co Refrigerating system
US2415338A (en) * 1945-04-20 1947-02-04 Detroit Lubricator Co Refrigeration system and expansion valve therefor

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614393A (en) * 1946-02-02 1952-10-21 Carrier Corp Art of refrigeration
US2707868A (en) * 1951-06-29 1955-05-10 Goodman William Refrigerating system, including a mixing valve
US2739450A (en) * 1952-09-30 1956-03-27 Carrier Corp Refrigeration system provided with compressor unloading mechanism
US2739451A (en) * 1952-09-30 1956-03-27 Carrier Corp Refrigeration system provided with compressor unloading mechanism
US2874550A (en) * 1955-05-19 1959-02-24 Keeprite Products Ltd Winter control valve arrangement in refrigerating system
US4286438A (en) * 1980-05-02 1981-09-01 Whirlpool Corporation Condition responsive liquid line valve for refrigeration appliance
US5600962A (en) * 1993-11-12 1997-02-11 Sanyo Electric Co., Ltd. Air conditioner
US6053000A (en) * 1999-01-15 2000-04-25 Levitin; Mikhail Refrigeration unit
US20090031738A1 (en) * 2005-05-06 2009-02-05 Tomoichiro Tamura Refrigerating machine
US7886550B2 (en) * 2005-05-06 2011-02-15 Panasonic Corporation Refrigerating machine
US20170307260A1 (en) * 2016-04-18 2017-10-26 Johnson Controls Technology Company Condenser evaporator system for refrigeration systems
US10024582B2 (en) * 2016-04-18 2018-07-17 Johnson Controls Technology Company Condenser and evaporator system for refrigeration systems
US10739041B2 (en) 2016-04-18 2020-08-11 Johnson Controls Technology Company Selectively controllable condenser and evaporator system
US10767907B2 (en) 2016-04-18 2020-09-08 Johnson Controls Technology Company Condenser evaporator system with a subcooler for refrigeration systems

Similar Documents

Publication Publication Date Title
US2434593A (en) Refrigeration system including a load control apparatus
US2286961A (en) Air conditioning apparatus
US3060699A (en) Condenser pressure regulating system
US2770100A (en) Air conditioning control
US2766593A (en) Automatic refrigeration system
US2954681A (en) Refrigeration system
US2461076A (en) Oil pressure safety control
US3377816A (en) Compressor control arrangement
US3293876A (en) Refrigeration system including control arrangement for maintaining head pressure
US3145543A (en) Means for controlling the head pressure in refrigerating systems
US1768602A (en) Refrigerating apparatus
US2218944A (en) Refrigerating apparatus
US2614393A (en) Art of refrigeration
US2523451A (en) Load-responsive refrigeration control
US2313391A (en) Refrigerating system
US2621487A (en) Safety control means for refrigerating systems
US2540550A (en) Art of refrigeration
US2330040A (en) Fluid pressure system
US2353347A (en) Refrigerating apparatus
US2959929A (en) Refrigeration system having air flow varying means
US3110160A (en) Refrigeration system control
US2185965A (en) Refrigerating apparatus
US3252295A (en) Refrigeration control system
US2765629A (en) Refrigerant expansion control
US3563048A (en) Automatic control for an air conditioning system