US20100251759A1 - Liquid pressure cycle having an ejector - Google Patents
Liquid pressure cycle having an ejector Download PDFInfo
- Publication number
- US20100251759A1 US20100251759A1 US12/384,437 US38443709A US2010251759A1 US 20100251759 A1 US20100251759 A1 US 20100251759A1 US 38443709 A US38443709 A US 38443709A US 2010251759 A1 US2010251759 A1 US 2010251759A1
- Authority
- US
- United States
- Prior art keywords
- pressure
- liquid
- ejector
- refrigerant
- evaporator
- 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.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/54—Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/06—Compression machines, plants or systems with non-reversible cycle with compressor of jet type, e.g. using liquid under pressure
Definitions
- the present invention relates to a refrigeration system, which utilizes a positive displacement rotary liquid pump for high-pressure refrigerant generation along with corresponding expansion valve, evaporator, ejector and condenser.
- the vapor compression refrigeration cycle is the predominate cooling method for millions of residential and commercial installations.
- the vapor compression cycle utilizes a vapor compressor to increase a low-pressure refrigerant gas to a high-pressure refrigerant gas.
- the high-pressure gas then passes through an air or water-cooled condenser where the gas changes state into a high-pressure liquid upon the removal of heat from the high-pressure gas.
- This high-pressure liquid then passes through an expansion valve into an evaporator. During this expansion process, heat is absorbed in the evaporator with space air or other medium being circulated through the evaporator. The net result is the cooling of the conditioned space or medium.
- the vapor compression cycle has only been improved on the margins. Typical improvements include more efficient vapor compressor designs, larger condenser and evaporator coils, use of variable speed modulation, use of liquid centrifugal pumps for increased expansion valve efficiency and the use of ejectors to reduce the amount of work expended by a vapor compressor.
- the goal of the liquid pressure cycle is to overcome the limited on the margin improvements of the vapor compression cycle.
- the liquid pressure cycle having an ejector pressurizes the liquid refrigerant of the system with a positive displacement rotary pump rather than pressurizing the vapor refrigerant with a compressor.
- the high-pressure liquid divides into two pressure streams. The first stream is directed to an expansion valve then on to an evaporator for space air or other medium cooling. The second stream is directed to the driving force input port of an ejector.
- This high-pressure input mixes with the low-pressure output from the evaporator. The result of this mixing provides for sufficient pressure enhancement to condense the combination refrigerant vapor as it passes through the condenser. The liquid flow from the condenser proceeds back to the liquid pressure pump and the cycle is repeated.
- the horsepower to pressurize a liquid for a given mass flow of refrigerant for the liquid pressure cycle is significantly less than the horsepower required for a vapor compression cycle of equal mass flow.
- FIG. 1 is a schematic diagram of the liquid pressure cycle having an ejector.
- the refrigeration cycle of the present invention begins with increasing the pressure of a liquid refrigerant with a high-pressure positive displacement rotary pump 10 powered by a fixed or variable speed motor 11 .
- This high-pressure liquid travels through conduit 12 and enters the expansion valve 13 then into the evaporator 14 .
- the expansion valve 13 opens and closes depending upon the set point temperature requirements of the evaporator 14 .
- the low-pressure gas output of the evaporator 14 proceeds through conduit 15 to the low-pressure port 17 b of the ejector 17 .
- Concurrently approximately fifty percent of the high-pressure flow from the liquid pressure pump 10 proceeds through conduit 16 to the driving force port 17 a of the ejector 17 .
- This high-pressure liquid input decompresses and mixes with the low-pressure gas output from evaporator 14 .
- the ejector process results in sufficient pressure enhancement which is required for the temperature conditions of condenser 19 .
- the refrigerant flow proceeds through conduit 18 and enters condenser 19 where heat is removed from the refrigerant thereby condensing into a liquid.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Thermal Sciences (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The liquid pressure cycle having an ejector pressurizes the liquid refrigerant of the system with a positive displacement rotary pump rather than pressurizing the vapor refrigerant with a vapor compressor. This high-pressure liquid proceeds into two pressure streams. The first stream is directed to an expansion valve then on to an evaporator for space air or other medium cooling. The second stream is directed to the driving force input port of an ejector. This high-pressure input mixes with the low-pressure output from the evaporator. The result of this mixing provides for sufficient pressure enhancement to condense the combination refrigerant vapor as it passes through the condenser. The liquid flow from the condenser proceeds back to the liquid pressure pump and the cycle is repeated.
Description
- 1. Field of the Invention
- The present invention relates to a refrigeration system, which utilizes a positive displacement rotary liquid pump for high-pressure refrigerant generation along with corresponding expansion valve, evaporator, ejector and condenser.
- 2. Description of the Prior Art
- The vapor compression refrigeration cycle is the predominate cooling method for millions of residential and commercial installations. The vapor compression cycle utilizes a vapor compressor to increase a low-pressure refrigerant gas to a high-pressure refrigerant gas. The high-pressure gas then passes through an air or water-cooled condenser where the gas changes state into a high-pressure liquid upon the removal of heat from the high-pressure gas. This high-pressure liquid then passes through an expansion valve into an evaporator. During this expansion process, heat is absorbed in the evaporator with space air or other medium being circulated through the evaporator. The net result is the cooling of the conditioned space or medium.
- The vapor compression cycle has only been improved on the margins. Typical improvements include more efficient vapor compressor designs, larger condenser and evaporator coils, use of variable speed modulation, use of liquid centrifugal pumps for increased expansion valve efficiency and the use of ejectors to reduce the amount of work expended by a vapor compressor. The goal of the liquid pressure cycle is to overcome the limited on the margin improvements of the vapor compression cycle.
- The liquid pressure cycle having an ejector pressurizes the liquid refrigerant of the system with a positive displacement rotary pump rather than pressurizing the vapor refrigerant with a compressor. The high-pressure liquid divides into two pressure streams. The first stream is directed to an expansion valve then on to an evaporator for space air or other medium cooling. The second stream is directed to the driving force input port of an ejector. This high-pressure input mixes with the low-pressure output from the evaporator. The result of this mixing provides for sufficient pressure enhancement to condense the combination refrigerant vapor as it passes through the condenser. The liquid flow from the condenser proceeds back to the liquid pressure pump and the cycle is repeated.
- The horsepower to pressurize a liquid for a given mass flow of refrigerant for the liquid pressure cycle is significantly less than the horsepower required for a vapor compression cycle of equal mass flow.
- It is an object of the invention to provide a simple refrigeration system with significant advantages over systems in the prior art.
- Additional objects and advantages of the invention are set forth, in part in the description which follows, and in part, will be obvious from description or may learned by practice of the invention. The objects and advantages of the invention will be realized in detail by means of the instrumentalities and combinations particularly pointed out in the appended claim.
- The accompanying drawing is incorporated in and form a part of the specification and together with the descriptions serves to explain the principles of the invention in which
FIG. 1 is a schematic diagram of the liquid pressure cycle having an ejector. - It is understood that both the foregoing general description and following detailed description are exemplary and explanatory only, and are not restrictive of the invention as claimed. The accompanying drawing which is incorporated herein for reference, and constitute part of the specifications, illustrate certain embodiments of the invention, and together with the detailed description serve to explain the principles of the present invention.
- Reference will now be made in detail to the embodiment of the refrigeration system of the present invention. This example is illustrative only and should not be construed to limit the invention unnecessarily.
- As shown in
FIG. 1 the refrigeration cycle of the present invention begins with increasing the pressure of a liquid refrigerant with a high-pressure positive displacementrotary pump 10 powered by a fixed orvariable speed motor 11. - This high-pressure liquid travels through
conduit 12 and enters theexpansion valve 13 then into theevaporator 14. Theexpansion valve 13 opens and closes depending upon the set point temperature requirements of theevaporator 14. There are several schemes to accomplish this control function currently in use today. During this expansion process, heat is absorbed in theevaporator 14 with space air or other medium being circulated through theevaporator 14. - The low-pressure gas output of the
evaporator 14 proceeds throughconduit 15 to the low-pressure port 17 b of theejector 17. Concurrently approximately fifty percent of the high-pressure flow from theliquid pressure pump 10 proceeds throughconduit 16 to thedriving force port 17 a of theejector 17. This high-pressure liquid input decompresses and mixes with the low-pressure gas output fromevaporator 14. The ejector process results in sufficient pressure enhancement which is required for the temperature conditions ofcondenser 19. Upon leavingejector 17, the refrigerant flow proceeds throughconduit 18 and enterscondenser 19 where heat is removed from the refrigerant thereby condensing into a liquid. The pressure enhancement capabilities of a typical ejector is more fully described in an early U.S. Pat. No. 3,277,660 and most recently refined in U.S. Pat. No. 6,438,993. Upon leavingcondenser 19, the liquid refrigerant then proceeds throughconduit 20 to the high-pressureliquid pressure pump 10 and the cycle is repeated. - It will be apparent to those skilled in the art that various modifications can be made in the construction and configuration of the present invention without departing from the scope or spirit of the invention. For example, the embodiment mentioned above is illustrative and explanatory only. Various changes can be made in material as well as the configuration of the device to engineer the specific desired outcome. Thus it is intended that the present invention cover the modifications and variations of the invention, provided they come within the scope of the appended claims and their equivalents.
Claims (1)
1. A liquid pressure cycle comprising:
a positive displacement rotary liquid pump for high pressure generation;
an expansion valve disposed at the outlet side of the high-pressure liquid pump;
an evaporator for evaporating low-pressure refrigerant after being decompressed by an expansion valve;
an ejector for mixing high-pressure and low-pressure refrigerant streams whose combined output pressure is enhanced and sent to a condenser;
a condenser for cooling and condensing refrigerant discharged from the ejector.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/384,437 US20100251759A1 (en) | 2009-04-03 | 2009-04-03 | Liquid pressure cycle having an ejector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/384,437 US20100251759A1 (en) | 2009-04-03 | 2009-04-03 | Liquid pressure cycle having an ejector |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100251759A1 true US20100251759A1 (en) | 2010-10-07 |
Family
ID=42825052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/384,437 Abandoned US20100251759A1 (en) | 2009-04-03 | 2009-04-03 | Liquid pressure cycle having an ejector |
Country Status (1)
Country | Link |
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US (1) | US20100251759A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108005743A (en) * | 2017-11-13 | 2018-05-08 | 中国科学院广州能源研究所 | A kind of cold synergy of contraction with pressure without pump organic Rankine cycle power generation system |
US10823461B2 (en) | 2015-05-13 | 2020-11-03 | Carrier Corporation | Ejector refrigeration circuit |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3861166A (en) * | 1973-03-01 | 1975-01-21 | Lone Star Gas Co | Heat pump system |
US4211207A (en) * | 1974-04-02 | 1980-07-08 | Stephen Molivadas | Heating and cooling systems |
US5117648A (en) * | 1990-10-16 | 1992-06-02 | Northeastern University | Refrigeration system with ejector and working fluid storage |
US6158237A (en) * | 1995-11-10 | 2000-12-12 | The University Of Nottingham | Rotatable heat transfer apparatus |
US20050178150A1 (en) * | 2004-02-18 | 2005-08-18 | Hiroshi Oshitani | Ejector cycle having multiple evaporators |
US20050268644A1 (en) * | 2004-02-18 | 2005-12-08 | Denso Corporation | Vapor compression cycle having ejector |
US20060266072A1 (en) * | 2005-05-24 | 2006-11-30 | Denso Corporation | Ejector and ejector cycle device |
US20070039350A1 (en) * | 2005-08-17 | 2007-02-22 | Denso Corporation | Refrigerant cycle device with ejector and refrigerant branch structure for the same |
US20070039349A1 (en) * | 2005-08-17 | 2007-02-22 | Denso Corporation | Refrigerant cycle device with ejector |
US20070119207A1 (en) * | 2004-09-22 | 2007-05-31 | Denso Corporation | Ejector-type refrigerant cycle device |
-
2009
- 2009-04-03 US US12/384,437 patent/US20100251759A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3861166A (en) * | 1973-03-01 | 1975-01-21 | Lone Star Gas Co | Heat pump system |
US4211207A (en) * | 1974-04-02 | 1980-07-08 | Stephen Molivadas | Heating and cooling systems |
US5117648A (en) * | 1990-10-16 | 1992-06-02 | Northeastern University | Refrigeration system with ejector and working fluid storage |
US6158237A (en) * | 1995-11-10 | 2000-12-12 | The University Of Nottingham | Rotatable heat transfer apparatus |
US20050178150A1 (en) * | 2004-02-18 | 2005-08-18 | Hiroshi Oshitani | Ejector cycle having multiple evaporators |
US20050268644A1 (en) * | 2004-02-18 | 2005-12-08 | Denso Corporation | Vapor compression cycle having ejector |
US20070119207A1 (en) * | 2004-09-22 | 2007-05-31 | Denso Corporation | Ejector-type refrigerant cycle device |
US20060266072A1 (en) * | 2005-05-24 | 2006-11-30 | Denso Corporation | Ejector and ejector cycle device |
US20070039350A1 (en) * | 2005-08-17 | 2007-02-22 | Denso Corporation | Refrigerant cycle device with ejector and refrigerant branch structure for the same |
US20070039349A1 (en) * | 2005-08-17 | 2007-02-22 | Denso Corporation | Refrigerant cycle device with ejector |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10823461B2 (en) | 2015-05-13 | 2020-11-03 | Carrier Corporation | Ejector refrigeration circuit |
CN108005743A (en) * | 2017-11-13 | 2018-05-08 | 中国科学院广州能源研究所 | A kind of cold synergy of contraction with pressure without pump organic Rankine cycle power generation system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |