EP1275917A2 - Dispositif de limitation de la pression de condensation dans une machine frigorifique - Google Patents
Dispositif de limitation de la pression de condensation dans une machine frigorifique Download PDFInfo
- Publication number
- EP1275917A2 EP1275917A2 EP02014999A EP02014999A EP1275917A2 EP 1275917 A2 EP1275917 A2 EP 1275917A2 EP 02014999 A EP02014999 A EP 02014999A EP 02014999 A EP02014999 A EP 02014999A EP 1275917 A2 EP1275917 A2 EP 1275917A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- condensation
- temperature
- saturation temperature
- limiting
- superheating
- 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.)
- Granted
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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/07—Exceeding a certain pressure value in a refrigeration component or cycle
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- 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
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/195—Pressures of the condenser
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/197—Pressures of the 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator
Definitions
- the present invention relates to a device for limiting the condensation pressure of a refrigerating machine.
- the refrigerating capacity of a refrigerating machine increases with the saturation temperature at evaporation, which in turn is linked to the temperature of the refrigerated fluid.
- the increase in refrigerating capacity also entails automatically an increase in the thermal power that the refrigerating machine must dissipate at the condenser.
- an increase in the saturation temperature at evaporation (which generally depends on an increase in the temperature of the cooled fluid) leads to an increase in the saturation temperature at condensation.
- a decrease in refrigerating capacity automatically leads to a decrease in the thermal power to be dissipated at the condenser and therefore to a decrease in the saturated temperature at condensation for an equal temperature of the hot source.
- condensation temperature tends to approach the safety value that would require shutting down the machine, it is possible to limit this rise by reducing the refrigerating capacity absorbed by the evaporator, since this is equivalent to a reduction in the thermal power affecting the condenser.
- the aim of the present invention is to provide a regulator that is capable of modulating the refrigerating capacity absorbed by the evaporator according to the requirements of the moment, so as to adapt in each instance to:
- an object of the invention is to provide a device that is simple, cheap and reliable.
- a device for limiting the condensation pressure of a refrigerating machine characterized in that it comprises means for the continuous and controlled regulation of superheating at the evaporator.
- a refrigerating machine comprises an evaporator 10, a compressor 11, a condenser 12 and a throttling valve 13, which are connected in succession and in series to each other.
- a device for limiting the condensation pressure of the refrigerating machine comprises means for the continuous and controlled regulation of superheating at the evaporator, constituted by a sensor 14 for detecting the evaporation pressure (or saturation temperature at evaporation), a sensor 15 for detecting the temperature of the superheated vapor in output from the evaporator, a sensor 16 for detecting the condensation pressure (or saturation temperature at condensation), and a microprocessor-based controller 17.
- the per se known throttling valve is of the type that is servoactuated, for example by a motor 13a.
- the throttling valve 13 is chosen among the ones that have recently been introduced commercially and are servoactuated automatically, usually but not exclusively by means of an electric servomotor, and are controlled by electronic devices that allow to adjust the superheating according to the instantaneous requirements or convenience (known self-actuated mechanical valves instead do not allow automatic variation of the overheating value according to the operating conditions, because setting occurs by means of a manually operated screw).
- the microprocessor-based controller 17 is connected to said sensors 14, 15 and 16 and to the servoactuation of the throttling valve 13.
- the device according to the invention utilizes the fact that the capacity of a refrigerating machine is, as a first approximation, proportional to the flow-rate of the evaporated refrigerating fluid, and that therefore if this flow-rate is decreased the overall refrigerating capacity is also decreased.
- the device acts so as to decrease in a controlled fashion the flow-rate of refrigerating fluid introduced in the evaporator by way of the gradual throttling of the throttling valve, the evaporator is underfed and accordingly the refrigerating capacity of the machine is reduced.
- the refrigerating fluid first changes state and is then superheated: i.e., to ensure the complete absence of a liquid phase (which is potentially harmful to the compressor) in output, the temperature of the vapor produced by the complete evaporation of the fluid is raised by a controlled extent with respect to the saturation temperature at evaporation.
- a reduction in the mass flow of fluid fed to the evaporator leads to faster evaporation, i.e., to a reduction of the portion of surface used to change the state of the refrigerating fluid and to a consequent increase of the portion where the fluid is superheated.
- the device according to the invention causes an increase in the superheating of the vapor that leaves the evaporator and obtains in cascade:
- the saturation temperature at condensation By limiting indirectly the saturation temperature at condensation, one is conditioned by the minimum evaporation temperature that can be tolerated before the occurrence of undesirable effects or of effects that damage the process (for example, in a water refrigerator the evaporation temperature should never be lower than 0 °C due to the risk of freezing).
- the microprocessor-based controller 17 in addition to the normal functions of controlling the machine, measures the saturation temperature at evaporation (usually by means of a measurement of the corresponding pressure) and the temperature of the superheated vapor by way of the sensors 14 and 15, mounted proximate to the evaporator 10 or inside it, and calculates their difference, obtaining the value of the superheating; then it applies a regulation action to the servomotor 13a of the throttling valve 13, in order to keep the superheating at the optimum value (in normal conditions, the lowest value that is compatible with regulation stability, in order to ensure maximum refrigerating capacity).
- the microprocessor-based controller 17 further measures the saturation temperature at condensation (usually by means of a measurement of the corresponding pressure) by way of the sensor 16 mounted proximate to the condenser 12 or inside it.
- the microprocessor 17 raises appropriately the value of the superheating by closing partially the throttling valve 13, with the result of underfeeding the evaporator 10 and of decreasing the refrigeration capacity, consequently also reducing the thermal power affecting the condenser 12 and ultimately the saturation temperature at condensation.
- the saturation temperature at evaporation also tends to decrease with respect to the initial value, until it might drop below the preset threshold following a marked increase in superheating.
- the microprocessor-based controller 17 is designed to check that the maximum threshold of the saturation temperature at condensation and the minimum threshold of the saturation temperature of evaporation are not passed, giving however priority to the latter and therefore preventing an excessive throttling of the throttling valve 13.
- the microprocessor-based controller 17 would stop the compressor 11 in order to prevent unacceptable operating conditions.
- the microprocessor-based controller 17 restores the superheating to lower values, opening the throttling valve 13 in a controlled fashion.
- the device according to the present invention is in fact able to modulate simply, cheaply and functionally, by controlling the superheating, the refrigerating capacity absorbed by the evaporator according to the instantaneous requirements, so as to adapt in each instance to:
- the materials employed may be any according to requirements.
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)
- Air Conditioning Control Device (AREA)
- Sorption Type Refrigeration Machines (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPD20010173 | 2001-07-12 | ||
IT2001PD000173A ITPD20010173A1 (it) | 2001-07-12 | 2001-07-12 | Dispositivo per limitare la pressione di condensazione di una macchina frigorifera |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1275917A2 true EP1275917A2 (fr) | 2003-01-15 |
EP1275917A3 EP1275917A3 (fr) | 2004-01-07 |
EP1275917B1 EP1275917B1 (fr) | 2008-04-02 |
Family
ID=11452412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02014999A Expired - Lifetime EP1275917B1 (fr) | 2001-07-12 | 2002-07-10 | Procédé de limitation de la pression de condensation dans une machine frigorifique |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1275917B1 (fr) |
AT (1) | ATE391272T1 (fr) |
DE (1) | DE60225877T2 (fr) |
ES (1) | ES2306746T3 (fr) |
IT (1) | ITPD20010173A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1684034A2 (fr) | 2004-12-30 | 2006-07-26 | Nakayama Engineering Company Limited | Système de réfrigération et son procédé de commande |
EP1775533A2 (fr) * | 2005-10-13 | 2007-04-18 | STIEBEL ELTRON GmbH & Co. KG | Procédé et appareil pour faire fonctionner un système frigorifique à compression |
BE1021838B1 (nl) * | 2014-05-09 | 2016-01-21 | Atlas Copco Airpower, Naamloze Vennootschap | Werkwijze en inrichting voor het koeldrogen van een gas |
US10823474B2 (en) | 2016-05-24 | 2020-11-03 | Carrier Corporation | Perturbation of expansion valve in vapor compression system |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4523435A (en) * | 1983-12-19 | 1985-06-18 | Carrier Corporation | Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system |
US4966006A (en) * | 1988-09-22 | 1990-10-30 | Danfoss A/S | Refrigeration plant and method of controlling a refrigeration plant |
JPH03164658A (ja) * | 1989-11-24 | 1991-07-16 | Toshiba Corp | 空気調和機 |
DE4303533A1 (de) * | 1993-02-06 | 1994-08-11 | Stiebel Eltron Gmbh & Co Kg | Verfahren zur Begrenzung der Heißgastemperatur in einem Kältemittelkreislauf und Expansionsventil |
US5522231A (en) * | 1993-01-19 | 1996-06-04 | Parker-Hannifin Corporation | Apparatus and method for mass flow control of a working fluid |
US5806327A (en) * | 1996-06-28 | 1998-09-15 | Lord; Richard G. | Compressor capacity reduction |
EP1050727A1 (fr) * | 1999-05-06 | 2000-11-08 | Siemens Building Technologies AG | Procédé et dispositif de réglage d'un cycle thermodynamique |
EP1134518A2 (fr) * | 2000-03-15 | 2001-09-19 | Carrier Corporation | Procédé de régulation d'un robinet électronique d'expansion basé sur l'étranglement du refroidisseur et sur la surchauffe de sortie |
-
2001
- 2001-07-12 IT IT2001PD000173A patent/ITPD20010173A1/it unknown
-
2002
- 2002-07-10 ES ES02014999T patent/ES2306746T3/es not_active Expired - Lifetime
- 2002-07-10 EP EP02014999A patent/EP1275917B1/fr not_active Expired - Lifetime
- 2002-07-10 DE DE60225877T patent/DE60225877T2/de not_active Expired - Lifetime
- 2002-07-10 AT AT02014999T patent/ATE391272T1/de not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4523435A (en) * | 1983-12-19 | 1985-06-18 | Carrier Corporation | Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system |
US4966006A (en) * | 1988-09-22 | 1990-10-30 | Danfoss A/S | Refrigeration plant and method of controlling a refrigeration plant |
JPH03164658A (ja) * | 1989-11-24 | 1991-07-16 | Toshiba Corp | 空気調和機 |
US5522231A (en) * | 1993-01-19 | 1996-06-04 | Parker-Hannifin Corporation | Apparatus and method for mass flow control of a working fluid |
DE4303533A1 (de) * | 1993-02-06 | 1994-08-11 | Stiebel Eltron Gmbh & Co Kg | Verfahren zur Begrenzung der Heißgastemperatur in einem Kältemittelkreislauf und Expansionsventil |
US5806327A (en) * | 1996-06-28 | 1998-09-15 | Lord; Richard G. | Compressor capacity reduction |
EP1050727A1 (fr) * | 1999-05-06 | 2000-11-08 | Siemens Building Technologies AG | Procédé et dispositif de réglage d'un cycle thermodynamique |
EP1134518A2 (fr) * | 2000-03-15 | 2001-09-19 | Carrier Corporation | Procédé de régulation d'un robinet électronique d'expansion basé sur l'étranglement du refroidisseur et sur la surchauffe de sortie |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 015, no. 400 (M-1167), 11 October 1991 (1991-10-11) & JP 03 164658 A (TOSHIBA CORP), 16 July 1991 (1991-07-16) * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1684034A2 (fr) | 2004-12-30 | 2006-07-26 | Nakayama Engineering Company Limited | Système de réfrigération et son procédé de commande |
EP1684034A3 (fr) * | 2004-12-30 | 2009-05-13 | Nakayama Engineering Company Limited | Système de réfrigération et son procédé de commande |
US7841195B2 (en) | 2004-12-30 | 2010-11-30 | Nakayama Engineering Company Limited | Refrigeration apparatus and method for controlling the same |
US8640473B2 (en) | 2004-12-30 | 2014-02-04 | Nakayama Engineering Company Limited | Refrigeration apparatus and method for controlling the same |
EP1775533A2 (fr) * | 2005-10-13 | 2007-04-18 | STIEBEL ELTRON GmbH & Co. KG | Procédé et appareil pour faire fonctionner un système frigorifique à compression |
EP1775533A3 (fr) * | 2005-10-13 | 2013-04-03 | STIEBEL ELTRON GmbH & Co. KG | Procédé et appareil pour faire fonctionner un système frigorifique à compression |
BE1021838B1 (nl) * | 2014-05-09 | 2016-01-21 | Atlas Copco Airpower, Naamloze Vennootschap | Werkwijze en inrichting voor het koeldrogen van een gas |
US10823474B2 (en) | 2016-05-24 | 2020-11-03 | Carrier Corporation | Perturbation of expansion valve in vapor compression system |
Also Published As
Publication number | Publication date |
---|---|
ES2306746T3 (es) | 2008-11-16 |
ATE391272T1 (de) | 2008-04-15 |
EP1275917A3 (fr) | 2004-01-07 |
ITPD20010173A1 (it) | 2003-01-12 |
DE60225877T2 (de) | 2009-04-09 |
DE60225877D1 (de) | 2008-05-15 |
EP1275917B1 (fr) | 2008-04-02 |
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