US3677028A - Refrigeration system - Google Patents
Refrigeration system Download PDFInfo
- Publication number
- US3677028A US3677028A US94036A US3677028DA US3677028A US 3677028 A US3677028 A US 3677028A US 94036 A US94036 A US 94036A US 3677028D A US3677028D A US 3677028DA US 3677028 A US3677028 A US 3677028A
- Authority
- US
- United States
- Prior art keywords
- refrigerant
- evaporator
- valve means
- refrigeration system
- restriction
- 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
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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- 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
- F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
Definitions
- a plurality of evaporators or evaporator circuits may be employed with a single condensing unit.
- Liquid line solenoid valves may be employed to activate those evaporators or evaporator circuits that are needed to satisfy the load on the system.
- a restriction device such as a thermal expansion valve may be provided between the solenoid valve and the evaporator or evaporator circuit associated therewith to control the flow of refrigerant to the evaporator.
- This invention relates to a refrigeration system comprising a compressor, a condenser for condensing high pressure refrigerant vapor from the compressor, and a plurality of evaporator circuits for passing heat exchange medium to be cooled in heat exchange relationship with refrigerant from the condenser, the refrigerant in the evaporator circuits being heated and vaporized by the heat exchange medium.
- Valve means are provided for each evaporator circuit, the valve means being adapted to prevent flow of refrigerant to the evaporator circuit when the valve means is closed and to provide a first stage restriction to the flow of refrigerant to the evaporator circuit when the valve means is open.
- a fixed refrigerant restrictor in the refrigerant line between the valve means and the evaporator circuit associated therewith is provided to produce a second stage restriction upstream of the evaporator circuit.
- a refrigeration system including a compressor 3 adapted to receive low pressure refrigerant vapor from refrigerant line 5 and provide high pressure refrigerant vapor to a condenser 7 through refrigerant line 9.
- Fan means 11 are provided for passing a heat exchange medium, preferably ambient air, in heat exchange relation with refrigerant within the condenser 7 to condense the refrigerant.
- Liquid refrigerant from condenser 7 is supplied to a plurality of evaporators or evaporator circuits 13 through refrigerant line 15.
- Each of the evaporator circuits 13 is provided with suitable valve means such as solenoid valves 17 and suitable fixed restriction means such as capillaries 19.
- the solenoid valves 17 are adapted to prevent flow of refrigerant to the evaporator circuit associated therewith when the cooling load served by the evaporator circuit is satisfied.
- the valves 17 are also adapted to provide a first stage refrigerant flow restriction for the evaporator circuit associated therewith when the valve is open.
- the capillaries 19 provide second stage refrigerant flow restrictions for the evaporator circuits associated therewith, the total restriction provided by the valves and the capillaries being selected to provide the desired superheat in the refrigerant leaving the evaporator circuits under normal operation conditions.
- valves which have heretofor employed solenoid valves to prevent flow of refrigerant to the evaporator circuit associated therewith, a valve two or three times as large as that necessary in the disclosed system was necessary to prevent flashing or undue restriction to the flow of refrigerant.
- a valve By utilizing a small valve and placing a fixed restrictor adjacent or immediately downstream from the valve, the valve may be utilized as a first stage restriction.
- the fixed restriction must be placed adjacent or immediately downstream from the valve to minimize pressure recovery between the valve and the fixed restriction.
- Refrigerant from the evaporator circuits is provided to an accumulator 21 through refrigerant line 23.
- Liquid refrigerant which may have passed through the evaporator circuits under low load conditions is collected in the lower portion of the accumulator to prevent slugs of liquid refrigerant from reaching the compressor and causing damage to the valves thereof.
- Refrigerant vapor from the upper portion of the accumulator passesto the compressor through refrigerant line 5 to complete the refrigeration cycle.
- a refrigeration system comprising a compressor
- a condenser for condensing refrigerant vapor from said compressor
- a plurality of evaporator circuits for passing heat exchange medium to be cooled in heat exchange relationship with refrigerant from said condenser, the refrigerant in the evaporator circuits being heated and vaporized thereby;
- each of said individual valve means being adapted to prevent flow of refrigerant to the evaporator circuit associated therewith when said valve means is closed and to provide a first stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith when said valve means is open;
- each of said individual valve means comprises a solenoid valve, the total restriction to refrigerant flow through said solenoid valve and said capillary producing the required refrigerant flow to the evaporator circuit associated herewith.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
A refrigeration system employing a plurality of evaporator circuits, the refrigerant flow to each circuit being controlled by a shut-off valve and a fixed restriction, the valve when open providing a first stage restriction to minimize the required pressure drop across the fixed restriction.
Description
United States Patent Raymond [45] July 18, 1972 I5 1 REFRIGERATION SYSTEM 1,803,074 4/1931 Schickler 62/5l l [72] Inventor: Glendon A. Raymond, Fulton, N.Y.
. Primary Examiner-Meyer Perlin [73] Asslgnee' Carrier Corporation Syracuse Attorneyl-larry G. Martin, Jr. and J. Raymond Curtin [22] Filed: Dec. 1, 1970 [2]] Appl. No.: 94,036 [57] ABSTRACT A refrigeration system employing a plurality of evaporator cir- [52] US. Cl ..62/200, 62/205, 662275212, Quits, the refrigerant flow to each circuit being controlled y a l 51 1 Int Cl F25) 5/00 shut-off valve and a fixed restriction, the valve when open 58] Fieid 222 223 providing a first stage restriction to minimize the required 5 l 9 pressure drop across the fixed restriction.
[56] References Cited 3 Claims, 1 Drawing Figure UNITED STATES PATENTS 2/1939 Labberton "62/51 1 PATtNlEuJuu'emz 3;677'.02-8
INVENTOR. GLENDON A. RAYMOND BY KziMf ATTORNEY REFRIGERATION SYSTEM BACKGROUND OF THE INVENTION In many refrigeration systems, a plurality of evaporators or evaporator circuits may be employed with a single condensing unit. Liquid line solenoid valves may be employed to activate those evaporators or evaporator circuits that are needed to satisfy the load on the system. A restriction device such as a thermal expansion valve may be provided between the solenoid valve and the evaporator or evaporator circuit associated therewith to control the flow of refrigerant to the evaporator.
SUMMARY OF THE INVENTION This invention relates to a refrigeration system comprising a compressor, a condenser for condensing high pressure refrigerant vapor from the compressor, and a plurality of evaporator circuits for passing heat exchange medium to be cooled in heat exchange relationship with refrigerant from the condenser, the refrigerant in the evaporator circuits being heated and vaporized by the heat exchange medium. Valve means are provided for each evaporator circuit, the valve means being adapted to prevent flow of refrigerant to the evaporator circuit when the valve means is closed and to provide a first stage restriction to the flow of refrigerant to the evaporator circuit when the valve means is open. A fixed refrigerant restrictor in the refrigerant line between the valve means and the evaporator circuit associated therewith is provided to produce a second stage restriction upstream of the evaporator circuit.
BRIEF DESCRIPTION OF THE DRAWING The drawing is a schematic of a refrigeration system embodying the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring more particularly to the drawing, there is illustrated a refrigeration system including a compressor 3 adapted to receive low pressure refrigerant vapor from refrigerant line 5 and provide high pressure refrigerant vapor to a condenser 7 through refrigerant line 9. Fan means 11 are provided for passing a heat exchange medium, preferably ambient air, in heat exchange relation with refrigerant within the condenser 7 to condense the refrigerant. Liquid refrigerant from condenser 7 is supplied to a plurality of evaporators or evaporator circuits 13 through refrigerant line 15.
Each of the evaporator circuits 13 is provided with suitable valve means such as solenoid valves 17 and suitable fixed restriction means such as capillaries 19. The solenoid valves 17 are adapted to prevent flow of refrigerant to the evaporator circuit associated therewith when the cooling load served by the evaporator circuit is satisfied. The valves 17 are also adapted to provide a first stage refrigerant flow restriction for the evaporator circuit associated therewith when the valve is open. The capillaries 19 provide second stage refrigerant flow restrictions for the evaporator circuits associated therewith, the total restriction provided by the valves and the capillaries being selected to provide the desired superheat in the refrigerant leaving the evaporator circuits under normal operation conditions.
ln systems which have heretofor employed solenoid valves to prevent flow of refrigerant to the evaporator circuit associated therewith, a valve two or three times as large as that necessary in the disclosed system was necessary to prevent flashing or undue restriction to the flow of refrigerant. By utilizing a small valve and placing a fixed restrictor adjacent or immediately downstream from the valve, the valve may be utilized as a first stage restriction. The fixed restriction must be placed adjacent or immediately downstream from the valve to minimize pressure recovery between the valve and the fixed restriction.
By providing a first stage pressure drop through the solenoid valve of at least 50 percent of the total pressure drop through the valve and the capillary, a smaller and, therefore, more refrigerant therein, the heat exchange medium being cooled and the refrigerant being vaporized thereby. Refrigerant from the evaporator circuits is provided to an accumulator 21 through refrigerant line 23. Liquid refrigerant which may have passed through the evaporator circuits under low load conditions is collected in the lower portion of the accumulator to prevent slugs of liquid refrigerant from reaching the compressor and causing damage to the valves thereof. Refrigerant vapor from the upper portion of the accumulator passesto the compressor through refrigerant line 5 to complete the refrigeration cycle.
I claim:
1. A refrigeration system comprising a compressor;
a condenser for condensing refrigerant vapor from said compressor;
a plurality of evaporator circuits for passing heat exchange medium to be cooled in heat exchange relationship with refrigerant from said condenser, the refrigerant in the evaporator circuits being heated and vaporized thereby;
individual valve means associated with each of said evaporator circuits, each of said individual valve means being adapted to prevent flow of refrigerant to the evaporator circuit associated therewith when said valve means is closed and to provide a first stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith when said valve means is open; and
fixed restriction means disposed immediately downstream from each of said individual valve means to provide a second stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith, said individual valve means providing at least 50 percent of the pressure drop created by the combination of said individual valve means and said fixed restriction means.
2. A refrigeration system according to claim 1 wherein said refrigerant restriction means is a capillary tube.
3. A refrigeration system according to claim 2 wherein each of said individual valve means comprises a solenoid valve, the total restriction to refrigerant flow through said solenoid valve and said capillary producing the required refrigerant flow to the evaporator circuit associated herewith.
Claims (3)
1. A refrigeration system comprising a compressor; a condenser for condensing refrigerant vapor from said compressor; a plurality of evaporator circuits for passing heat exchange medium to be cooled in heat exchange relationship with refrigerant from said condenser, the refrigerant in the evaporator circuits being heated and vaporized thereby; individual valve means associated with each of said evaporator circuits, each of said individual valve means being adapted to prevent flow of refrigerant to the evaporator circuit associated therewith when said valve means is closed and to provide a first stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith when said valve means is open; and fixed restriction means disposed immediately downstream from each of said individual valve means to provide a second stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith, said individual valve means providing at least 50 percent of the pressure drop created by the combination of said individual valve means and said fixed restriction means.
2. A refrigeration system according to claim 1 wherein said refrigerant restriction means is a capillary tube.
3. A refrigeration system according to claim 2 wherein each of said individual valve means comprises a solenoid valve, the total restriction to refrigerant flow through said solenoid valve and said capillary producing the required refrigerant flow to the evaporator circuit associated herewith.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US9403670A | 1970-12-01 | 1970-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3677028A true US3677028A (en) | 1972-07-18 |
Family
ID=22242421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US94036A Expired - Lifetime US3677028A (en) | 1970-12-01 | 1970-12-01 | Refrigeration system |
Country Status (1)
Country | Link |
---|---|
US (1) | US3677028A (en) |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3884663A (en) * | 1973-05-08 | 1975-05-20 | Ettore Funaro | Refrigerator system with refrigerant expansion through capillary tubes of adjustable length |
US4233818A (en) * | 1978-06-23 | 1980-11-18 | Lastinger William R | Heat exchange interface apparatus |
US4269042A (en) * | 1979-09-28 | 1981-05-26 | E. I. Du Pont De Nemours And Company | Centrifuge refrigeration system |
US4286438A (en) * | 1980-05-02 | 1981-09-01 | Whirlpool Corporation | Condition responsive liquid line valve for refrigeration appliance |
US4344299A (en) * | 1980-08-05 | 1982-08-17 | Latzer John B | Transportable compartment refrigeration panel system and method of installing |
US4373353A (en) * | 1977-08-17 | 1983-02-15 | Fedders Corporation | Refrigerant control |
US4394816A (en) * | 1981-11-02 | 1983-07-26 | Carrier Corporation | Heat pump system |
US4459819A (en) * | 1982-03-05 | 1984-07-17 | Emerson Electric Co. | Pulse controlled expansion valve and method |
US4550574A (en) * | 1983-06-02 | 1985-11-05 | Sexton-Espec, Inc. | Refrigeration system with liquid bypass line |
US4563879A (en) * | 1984-05-23 | 1986-01-14 | Mitsubishi Denki Kabushiki Kaisha | Heat pump with capillary tube-type expansion device |
GB2217826A (en) * | 1988-04-25 | 1989-11-01 | Matsushita Electric Ind Co Ltd | Air conditioning systems |
US6138919A (en) * | 1997-09-19 | 2000-10-31 | Pool Fact, Inc. | Multi-section evaporator for use in heat pump |
US6502413B2 (en) * | 2001-04-02 | 2003-01-07 | Carrier Corporation | Combined expansion valve and fixed restriction system for refrigeration cycle |
US20060162377A1 (en) * | 2005-01-24 | 2006-07-27 | Collings Douglas A | Expansion device arrangement for vapor compression system |
US20080302117A1 (en) * | 2007-06-11 | 2008-12-11 | Glacier Bay, Inc. | Air conditioning system |
US20110289948A1 (en) * | 2005-11-24 | 2011-12-01 | Danfoss A/S | method of analysing a refrigeration system and a method of controlling a refrigeration system |
US9599353B2 (en) | 2013-07-26 | 2017-03-21 | Whirlpool Corporation | Split air conditioning system with a single outdoor unit |
US9605884B2 (en) | 2011-10-24 | 2017-03-28 | Whirlpool Corporation | Multiple evaporator control using PWM valve/compressor |
US9970698B2 (en) | 2011-10-24 | 2018-05-15 | Whirlpool Corporation | Multiple evaporator control using PWM valve/compressor |
US10047990B2 (en) | 2013-03-26 | 2018-08-14 | Aaim Controls, Inc. | Refrigeration circuit control system |
US10753663B2 (en) * | 2018-01-25 | 2020-08-25 | Johnson Controls Technology Company | HVAC system with multiple compressors and heat exchangers |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1803074A (en) * | 1929-06-14 | 1931-04-28 | Edmund E Allyne | Refrigerating apparatus |
US2148413A (en) * | 1935-03-12 | 1939-02-21 | Westinghouse Electric & Mfg Co | Refrigerating apparatus |
-
1970
- 1970-12-01 US US94036A patent/US3677028A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1803074A (en) * | 1929-06-14 | 1931-04-28 | Edmund E Allyne | Refrigerating apparatus |
US2148413A (en) * | 1935-03-12 | 1939-02-21 | Westinghouse Electric & Mfg Co | Refrigerating apparatus |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3884663A (en) * | 1973-05-08 | 1975-05-20 | Ettore Funaro | Refrigerator system with refrigerant expansion through capillary tubes of adjustable length |
US4373353A (en) * | 1977-08-17 | 1983-02-15 | Fedders Corporation | Refrigerant control |
US4233818A (en) * | 1978-06-23 | 1980-11-18 | Lastinger William R | Heat exchange interface apparatus |
US4269042A (en) * | 1979-09-28 | 1981-05-26 | E. I. Du Pont De Nemours And Company | Centrifuge refrigeration system |
US4286438A (en) * | 1980-05-02 | 1981-09-01 | Whirlpool Corporation | Condition responsive liquid line valve for refrigeration appliance |
US4344299A (en) * | 1980-08-05 | 1982-08-17 | Latzer John B | Transportable compartment refrigeration panel system and method of installing |
US4394816A (en) * | 1981-11-02 | 1983-07-26 | Carrier Corporation | Heat pump system |
US4459819A (en) * | 1982-03-05 | 1984-07-17 | Emerson Electric Co. | Pulse controlled expansion valve and method |
US4550574A (en) * | 1983-06-02 | 1985-11-05 | Sexton-Espec, Inc. | Refrigeration system with liquid bypass line |
US4563879A (en) * | 1984-05-23 | 1986-01-14 | Mitsubishi Denki Kabushiki Kaisha | Heat pump with capillary tube-type expansion device |
GB2217826A (en) * | 1988-04-25 | 1989-11-01 | Matsushita Electric Ind Co Ltd | Air conditioning systems |
GB2217826B (en) * | 1988-04-25 | 1992-04-29 | Matsushita Electric Ind Co Ltd | Air conditioning system |
US6138919A (en) * | 1997-09-19 | 2000-10-31 | Pool Fact, Inc. | Multi-section evaporator for use in heat pump |
US6502413B2 (en) * | 2001-04-02 | 2003-01-07 | Carrier Corporation | Combined expansion valve and fixed restriction system for refrigeration cycle |
US20060162377A1 (en) * | 2005-01-24 | 2006-07-27 | Collings Douglas A | Expansion device arrangement for vapor compression system |
US7178362B2 (en) * | 2005-01-24 | 2007-02-20 | Tecumseh Products Cormpany | Expansion device arrangement for vapor compression system |
US20110289948A1 (en) * | 2005-11-24 | 2011-12-01 | Danfoss A/S | method of analysing a refrigeration system and a method of controlling a refrigeration system |
US8806879B2 (en) * | 2005-11-24 | 2014-08-19 | Danfoss A/S | Method of analysing a refrigeration system and a method of controlling a refrigeration system |
US20080302117A1 (en) * | 2007-06-11 | 2008-12-11 | Glacier Bay, Inc. | Air conditioning system |
US9970698B2 (en) | 2011-10-24 | 2018-05-15 | Whirlpool Corporation | Multiple evaporator control using PWM valve/compressor |
US9605884B2 (en) | 2011-10-24 | 2017-03-28 | Whirlpool Corporation | Multiple evaporator control using PWM valve/compressor |
US10047990B2 (en) | 2013-03-26 | 2018-08-14 | Aaim Controls, Inc. | Refrigeration circuit control system |
US9970667B2 (en) | 2013-07-26 | 2018-05-15 | Whirlpool Corporation | Air conditioning systems with multiple temperature zones from independent ducting systems and a single outdoor unit |
US9599353B2 (en) | 2013-07-26 | 2017-03-21 | Whirlpool Corporation | Split air conditioning system with a single outdoor unit |
US10180257B2 (en) | 2013-07-26 | 2019-01-15 | Whirlpool Corporation | Air conditioning systems for at least two rooms using a single outdoor unit |
US10753663B2 (en) * | 2018-01-25 | 2020-08-25 | Johnson Controls Technology Company | HVAC system with multiple compressors and heat exchangers |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3677028A (en) | Refrigeration system | |
US3481152A (en) | Condenser head pressure control system | |
CN101535745B (en) | Apparatus for refrigeration cycle and refrigerator | |
US3392541A (en) | Plural compressor reverse cycle refrigeration or heat pump system | |
US3866439A (en) | Evaporator with intertwined circuits | |
US8539789B2 (en) | Heat-pump chiller with improved heat recovery features | |
JP3102651U (en) | Refrigerator refrigerator with two evaporators | |
US8117855B2 (en) | Refrigeration system with consecutive expansions and method | |
US4123914A (en) | Energy saving change of phase refrigeration system | |
US3145543A (en) | Means for controlling the head pressure in refrigerating systems | |
KR970011615A (en) | Air Conditioning System with Auxiliary Cooler Coil and Series Expansion Unit | |
US2679142A (en) | Reheat control arrangement for air conditioning systems | |
US2919558A (en) | Air conditioning system | |
CN101198831A (en) | Refrigerating unit | |
KR20170047927A (en) | Air-conditioning system using the outside air cold water | |
CN107421173B (en) | Emergency refrigerating device and machine room air conditioner continuous refrigerating system | |
US2912831A (en) | Refrigerant flow control for a refrigeration system | |
US3520146A (en) | Refrigeration system | |
US2401233A (en) | Intermittent absorption or adsorption type refrigeration | |
US3371501A (en) | Refrigerant system expansion means | |
US2746266A (en) | Air conditioning apparatus | |
JPH07848Y2 (en) | Heat pump type air conditioner | |
KR100215038B1 (en) | Indoor device connection structure of multi-airconditioner | |
JPH06241582A (en) | Heat accumulative type cooling device | |
CN114111076B (en) | Modularized non-azeotropic working medium relay evaporation refrigeration system and control method thereof |