EP0801278A2 - Device for increasing the evaporator pressure in heat pumps and/or refrigeration machines with zeotropic refrigerant - Google Patents

Device for increasing the evaporator pressure in heat pumps and/or refrigeration machines with zeotropic refrigerant Download PDF

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Publication number
EP0801278A2
EP0801278A2 EP96120304A EP96120304A EP0801278A2 EP 0801278 A2 EP0801278 A2 EP 0801278A2 EP 96120304 A EP96120304 A EP 96120304A EP 96120304 A EP96120304 A EP 96120304A EP 0801278 A2 EP0801278 A2 EP 0801278A2
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EP
European Patent Office
Prior art keywords
heat exchanger
internal heat
sensor
machine according
refrigeration machine
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
Application number
EP96120304A
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German (de)
French (fr)
Other versions
EP0801278A3 (en
EP0801278B1 (en
Inventor
Ruedi Kuratli
Oscar Abegg
Hans Hohl
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.)
SATAG Thermotechnik AG
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Saurer Thermotechnik AG
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Publication date
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Application filed by Saurer Thermotechnik AG filed Critical Saurer Thermotechnik AG
Publication of EP0801278A2 publication Critical patent/EP0801278A2/en
Publication of EP0801278A3 publication Critical patent/EP0801278A3/en
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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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
    • 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
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor

Definitions

  • heat pumps and chillers consists of a heat-absorbing (1) and a heat-emitting (2) heat exchanger, an energy-absorbing compressor unit (3) and a throttling or expanding device (4). They can be designed as cold gas or cold steam engines. This is shown in Fig. 1.
  • the claim relates to heat pumps and / or refrigeration machines with a steam process, which means that a material circulates in the system that occurs both in gaseous and liquid form.
  • the patent claim relates to heat pumps and / or refrigeration machines which are operated with a refrigerant with a zeotropic behavior. They are characterized in that condensation or evaporation do not take place at a certain temperature point, but at a sliding temperature (glide), that is to say in a temperature range.
  • Heat pumps and / or chillers according to the patent claim are additionally equipped with a suction gas-liquid gas heat exchanger (5), called an internal heat exchanger, and the sensor (6) of the expansion valve is arranged on the suction line in such a way that it is installed behind the internal heat exchanger instead of in front of it is.
  • This device is shown in FIG. 2. If there are several internal heat exchangers, the sensor (6) is placed between the last internal heat exchanger and the compressor.
  • FIG. 3 shows the pressure-enthalpy diagram (log p / h diagram) with the process without (dashed line) and with (solid line) of the device according to the patent claim.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

The device uses a zeotropic refrigeration medium and includes a suction gas/liquid gas internal heat exchanger (5) for increasing the vapour pressure. A sensor (6) for the expansion valve (4) between the heat extraction and heat delivery heat exchangers is positioned on the low pressure side of the internal heat exchanger. In the case of a number of internal heat exchangers, the sensor for the expansion valve is positioned between the last internal heat exchanger and the compressor.

Description

Technisches Gebiet : Wärmepumpen und/oder Kältemaschinen mit Dampfprozess Technical field: heat pumps and / or chillers with steam process

Wärmepumpen und Kältemaschinen bestehen in ihrer einfachsten Ausführung aus einem wärmeaufnehmenden (1) und einem wärmeabgebenden (2) Wärmetauscher, einem energieaufnehmenden Verdichteraggregat (3) und einer Drossel- oder Expandiereinrichtung (4). Sie können als Kaltgas- oder Kaltdampfmaschinen ausgeführt werden. Dies ist in Fig. 1 dargestellt.The simplest version of heat pumps and chillers consists of a heat-absorbing (1) and a heat-emitting (2) heat exchanger, an energy-absorbing compressor unit (3) and a throttling or expanding device (4). They can be designed as cold gas or cold steam engines. This is shown in Fig. 1.

Der Patentanspruch betrifft Wärmepumpen und/oder Kältemaschinen mit Dampfprozess, das heisst es zirkuliert im System ein Stoff der sowohl gasförmig als auch flüssig auftritt. Insbesondere betrifft der Patenanspruch wärmepumpen und/oder Kältemaschinen, welche mit einem Kältemittel mit zeotropem Verhalten betrieben werden. Sie sind dadurch gekennzeichnet, dass Kondensation bzw. Verdampfung nicht bei einem bestimmten Temperaturpunkt, sondern bei gleitender Temperatur (Glide), das heisst in einem Temperaturbereich stattfinden.The claim relates to heat pumps and / or refrigeration machines with a steam process, which means that a material circulates in the system that occurs both in gaseous and liquid form. In particular, the patent claim relates to heat pumps and / or refrigeration machines which are operated with a refrigerant with a zeotropic behavior. They are characterized in that condensation or evaporation do not take place at a certain temperature point, but at a sliding temperature (glide), that is to say in a temperature range.

Wärmepumpen und/oder Kältemaschinen gemäss dem Patentanspruch werden zusätzlich mit einem Sauggas-Flüssiggas-Wärmetauscher (5), interner Wärmetauscher genannt, ausgerüstet und der Fühler (6) des Expansionsventils an der Saugleitung derart angeordnet, dass er nach, statt vor diesem internen Wärmetauscher montiert ist. Diese Vorrichtung ist in Fig. 2 dargestellt. Falls mehrere interne Wärmetauscher vorhanden sind, ist der Fühler (6) zwischen dem letzten internen Wärmetauscher und dem Kompressor plaziert.Heat pumps and / or chillers according to the patent claim are additionally equipped with a suction gas-liquid gas heat exchanger (5), called an internal heat exchanger, and the sensor (6) of the expansion valve is arranged on the suction line in such a way that it is installed behind the internal heat exchanger instead of in front of it is. This device is shown in FIG. 2. If there are several internal heat exchangers, the sensor (6) is placed between the last internal heat exchanger and the compressor.

Die Fig. 3 zeigt das Druck-Enthalpie-Diagramm (log p / h - Diagramm) mit dem Prozess ohne (gestrichelte Linie) und mit (ausgezogene Linie) der Vorrichtung gemäss Patentanspruch. Im Text werden die Diagrammstrecken folgendermassen bezeichnet: 1. Buchstabe = Streckenanfang, → = bis, 2. Buchstabe = Streckenende.3 shows the pressure-enthalpy diagram (log p / h diagram) with the process without (dashed line) and with (solid line) of the device according to the patent claim. In the text, the diagram sections are designated as follows: 1st letter = section start, → = to, 2nd letter = section end.

Durch diese Vorrichtung wird:

  • 1. die Flüssigkeit vor dem Drossel-/Expandierorgan stärker unterkühlt (A→B) und der Flüssigkeitsanteil am Eintritt (7, C) in den Verdampfer vergrössert. Der im Verdampfer nutzbare Anteil des Glides wird dadurch vergrössert (C→E).
  • 2. das Kältemittel nicht im Verdampfer (1) sondern erst im zusätzlichen internen Wärmetauscher (5) fertig verdampft (D→E) und überhitzt (E→F), und die gesamte Verdampferfläche steht bei höherem Flüssigkeitsanteil für die Verdampfung zur Verfügung.
  • 3. im Druck-Enthalpie-Diagramm der Verdampfungsprozess durch diese Massnahmen bei gleichbleibenden Temperaturen nach links, zu höheren Drücken (C'→C) verschoben. Dadurch wird der Verdampfungsdruck erhöht und somit die Druckdifferenz zwischen Kondensation und Verdampfung verringert (A→C' wird zu B→C), wodurch die Leistungsaufnahme des Kompressors geringer und somit die Leistungszahl erhöht wird.
With this device:
  • 1. The liquid in front of the throttling / expanding element is more strongly undercooled (A → B) and the proportion of liquid at the inlet (7, C) in the evaporator is increased. This increases the amount of glide that can be used in the evaporator (C → E).
  • 2. The refrigerant is not evaporated in the evaporator (1) but only in the additional internal heat exchanger (5) (D → E) and overheated (E → F), and the entire evaporator surface is available for evaporation with a higher liquid content.
  • 3. In the pressure-enthalpy diagram, the evaporation process is shifted to the left, to higher pressures (C '→ C) by these measures at constant temperatures. This increases the evaporation pressure and thus the pressure difference between condensation and evaporation is reduced (A → C 'becomes B → C), as a result of which the power consumption of the compressor is lower and thus the coefficient of performance is increased.

Claims (3)

Wärmepumpe und/oder Kältemaschine nach dem Dampf-Kompressionsprinzip mit zeotropem Kältemittel dadurch gekennzeichnet, dass ein zusätzlicher, interner Wärmeaustausch im Gegenstrom (5) zwischen dem Kondensatoraustritt und dem Verdampferaustritt zur Fertigverdampfung (D→E) und Ueberhitzung (E→F) des Kältemittels derart eingesetzt wird, dass der Fühler (6) des Expansionsventils an der Saugleitung nach dem Ausgang des internen Wärmetauschers (5) niederdruckseitig montiert wird. Falls mehrere interne Wärmetauscher vorhanden sind, ist der Fühler (6) zwischen dem letzten internen Wärmetauscher und dem Kompressor plaziert.Heat pump and / or refrigeration machine according to the steam compression principle with zeotropic refrigerant, characterized in that an additional, internal heat exchange in counterflow (5) between the condenser outlet and the evaporator outlet for final evaporation (D → E) and overheating (E → F) of the refrigerant is used that the sensor (6) of the expansion valve is mounted on the suction line after the outlet of the internal heat exchanger (5) on the low pressure side. If there are several internal heat exchangers, the sensor (6) is placed between the last internal heat exchanger and the compressor. Wärmepumpe und/oder Kältemaschine nach Anspruch 1, dadurch gekennzeichnet, dass im internen Wärmetauscher (5) niederdruckseitig geeignete Massnahmen getroffen werden, damit der am Eintritt mitgeführte Flüssigkeitsanteil in Kontakt zur Wärmetauscherfläche gebracht wird.Heat pump and / or refrigeration machine according to claim 1, characterized in that in the internal heat exchanger (5) suitable measures are taken on the low pressure side so that the liquid portion carried at the inlet is brought into contact with the heat exchanger surface. Wärmepumpe und/oder Kältemaschine nach Anspruch 2, dadurch gekennzeichnet, dass diese Massnahme im Falle eines Coaxialwärmetauschers aus einem spiralförmig verwundenen Blechstreifen besteht um dem Massestrom einen Drall zu erteilen, damit die schwereren Flüssigkeitstropfen im Flüssigkeits-Dampfgemisch an die Wärmetauscherwand geschleudert werden.Heat pump and / or refrigeration machine according to claim 2, characterized in that this measure in the case of a coaxial heat exchanger consists of a spirally twisted sheet metal strip in order to impart a swirl to the mass flow so that the heavier liquid drops in the liquid-vapor mixture are thrown against the heat exchanger wall.
EP96120304A 1996-04-01 1996-12-18 Device for increasing the evaporator pressure in heat pumps and/or refrigeration machines with zeotropic refrigerant Expired - Lifetime EP0801278B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH00839/96A CH691743A5 (en) 1996-04-01 1996-04-01 Plant for power conversion by the cold vapor compression process.
CH83996 1996-04-01
CH839/96 1996-04-01

Publications (3)

Publication Number Publication Date
EP0801278A2 true EP0801278A2 (en) 1997-10-15
EP0801278A3 EP0801278A3 (en) 1999-07-14
EP0801278B1 EP0801278B1 (en) 2003-08-13

Family

ID=4196407

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Application Number Title Priority Date Filing Date
EP96120304A Expired - Lifetime EP0801278B1 (en) 1996-04-01 1996-12-18 Device for increasing the evaporator pressure in heat pumps and/or refrigeration machines with zeotropic refrigerant

Country Status (4)

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EP (1) EP0801278B1 (en)
AT (1) ATE247261T1 (en)
CH (1) CH691743A5 (en)
DE (1) DE59610659D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0926454A3 (en) * 1997-12-25 2000-03-08 Mitsubishi Denki Kabushiki Kaisha Refrigerating apparatus
WO2011031014A2 (en) * 2009-09-11 2011-03-17 Lg Electronics Inc. Air conditioner and method for controlling the same
DE102017216361A1 (en) * 2017-09-14 2019-03-14 Weiss Umwelttechnik Gmbh Process for the conditioning of air

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2497931A1 (en) * 1981-01-15 1982-07-16 Inst Francais Du Petrole METHOD FOR HEATING AND HEAT CONDITIONING USING A COMPRESSION HEAT PUMP OPERATING WITH A MIXED WORKING FLUID AND APPARATUS FOR CARRYING OUT SAID METHOD
DE3119436A1 (en) * 1981-05-14 1982-12-02 Haase-Wärme GmbH, 2350 Neumünster Method of recovering environmental heat for heating purposes or the like by means of a refrigerant circuit, evaporating a refrigerant, and refrigerant circuit
DE3408626A1 (en) * 1984-03-09 1985-09-12 Wieland-Werke Ag, 7900 Ulm Wound heat exchanger, in particular for heat pumps or refrigerating plants
DE3618295A1 (en) * 1986-05-30 1987-12-03 Wilfried Dipl Ing Buttchereit Heat exchanger
US5056329A (en) * 1990-06-25 1991-10-15 Battelle Memorial Institute Heat pump systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0926454A3 (en) * 1997-12-25 2000-03-08 Mitsubishi Denki Kabushiki Kaisha Refrigerating apparatus
US6192696B1 (en) 1997-12-25 2001-02-27 Mitsubishi Denki Kabushiki Kaisha Refrigerating apparatus
WO2011031014A2 (en) * 2009-09-11 2011-03-17 Lg Electronics Inc. Air conditioner and method for controlling the same
WO2011031014A3 (en) * 2009-09-11 2011-07-07 Lg Electronics Inc. Air conditioner and method for controlling the same
DE102017216361A1 (en) * 2017-09-14 2019-03-14 Weiss Umwelttechnik Gmbh Process for the conditioning of air
US11237097B2 (en) 2017-09-14 2022-02-01 Weiss Technik Gmbh Air conditioning method and device

Also Published As

Publication number Publication date
EP0801278A3 (en) 1999-07-14
ATE247261T1 (en) 2003-08-15
DE59610659D1 (en) 2003-09-18
CH691743A5 (en) 2001-09-28
EP0801278B1 (en) 2003-08-13

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