DE4218299A1 - High capacity refrigeration appts. for deep-freezing, air-conditioning or building heating - uses air as working medium compressed nearly isothermally and comprises continuously working rotating machines for delivering large vol. flows, e.g. with screws for compressing refrigerant vapour - Google Patents

High capacity refrigeration appts. for deep-freezing, air-conditioning or building heating - uses air as working medium compressed nearly isothermally and comprises continuously working rotating machines for delivering large vol. flows, e.g. with screws for compressing refrigerant vapour

Info

Publication number
DE4218299A1
DE4218299A1 DE19924218299 DE4218299A DE4218299A1 DE 4218299 A1 DE4218299 A1 DE 4218299A1 DE 19924218299 DE19924218299 DE 19924218299 DE 4218299 A DE4218299 A DE 4218299A DE 4218299 A1 DE4218299 A1 DE 4218299A1
Authority
DE
Germany
Prior art keywords
air
water
machines
compression
screws
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.)
Pending
Application number
DE19924218299
Other languages
German (de)
Inventor
Helmut Radebold
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19924218299 priority Critical patent/DE4218299A1/en
Publication of DE4218299A1 publication Critical patent/DE4218299A1/en
Pending legal-status Critical Current

Links

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
    • 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
    • F25B9/004—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0007—Injection of a fluid in the working chamber for sealing, cooling and lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0085—Systems using a compressed air circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/02—System or Device comprising a heat pump as a subsystem, e.g. combined with humidification/dehumidification, heating, natural energy or with hybrid system
    • F24F2203/021—Compression cycle
    • F24F2203/023—Compression cycle with turbine used for expansion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/56—Cooling being a secondary aspect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems

Abstract

Two such machines (1,2) are respectively mounted on a common shaft (4) as a refrigeration set, with air as a thermodynamic working medium. The first machine working as a screw compressor compresses the suction air. The heat produced during compression is given to the air to be compressed. Water is separated by a separator and drawn off partly by heating and partly by vaporisation. The isothermally compressed air after the separation of the water part, after passing through a recuperative heat exchanger (5), and with further cooling by air, enters the second screw machine. The air is expanded there at a very low temp. The separated water following the removal of the compression heat is led into an external heat exchanger in the circuit. The water is used for transporting heat and for the lubrication of the machines. USE/ADVANTAGE - Air conditioning or heating of buildings. Air at relatively low pressures can be used. Oil is no longer needed as lubricant. Wide temp. range.

Description

Schraubenverdichter, wie sie heute in einem breiten Leistungsspektrum angeboten werden, sind technologisch sehr fortgeschrittene Maschinen, die große Volumenströme fördern können. Sie werden heute in der Kühltechnik ausschließlich als Kompressoren für Kältemittel auf der Basis FCKW und ihrer Ersatzstoffe eingesetzt, um Wärme aus einem Raum tieferer Temperatur in die Umgebung zu pumpen. Sie werden mit Öl geschmiert.Screw compressors as they are today in a wide range of services offered are technologically very advanced machines, that can promote large volume flows. You will be in the today Cooling technology only as compressors for refrigerants on the CFCs and their substitutes are used to generate heat from a Pump room of lower temperature into the environment. They will with Oil lubricated.

Die vorliegende Erfindung besteht darin, Schrauben sowohl für die Verdichtung als auch für die Entspannung von Luft einzusetzen, um so große Kälteleistungen sogar in einem offenen Kreislauf zu erreichen (Fig. 1): Jeweils 2 Schrauben werden paarweise auf gleicher Welle eingesetzt, um die eine Schraube (1) wie bisher zur Kompression von Luft, die andere (2) als Entspannungsmaschine zur Entspannung des verdichteten, vorher möglichst auf Umgebungstemperatur abgekühlten Luftstromes zu verwenden. Um eine günstige Leistungszahl zu erreichen, und um gleichzeitig das bisher zur Schmierung verwendete Öl zu eliminieren, wird Wasser quasi in einem geschlossenen Kreislauf (3) verwendet, sowohl zur Schmierung der Schraube als auch zur Wärmeabfuhr aus der im Verdichterteil zu komprimierenden Luft. Der Schraubenverdichter ist wahrscheinlich eine der wenigen heutigen thermodynamischen Maschinen, der Kompression bei gleichzeitiger Kühlung zu erreichen gestattet und so zu einer isothermen Verdichtung fähig ist.The present invention consists of using screws both for the compression and for the expansion of air, in order to achieve such high cooling capacities even in an open circuit ( Fig. 1): 2 screws are used in pairs on the same shaft, around one Screw ( 1 ) as before for the compression of air, the other ( 2 ) as a relaxation machine to relax the compressed air flow, which has previously cooled to ambient temperature. In order to achieve a favorable coefficient of performance and at the same time to eliminate the oil previously used for lubrication, water is used in a closed circuit ( 3 ), both for lubricating the screw and for dissipating heat from the air to be compressed in the compressor part. The screw compressor is probably one of the few thermodynamic machines available today that allows compression to be achieved while cooling and is therefore capable of isothermal compression.

Ein solches Aggregat, das wegen der relativ geringen Drücke bei Luft als Kältemittel, und bei der Kompensation der axialen Kräfte durch die gemeinsame Welle (4) auch möglicherweise teilweise aus Kunststoffe gebaut werden kann, ist in einem weiten Temperaturbereich einsetzbar, wenn neben einem Wasserabscheider ein zusätzlicher Wärmetauscher (Rekuperator) (5) zwischen beide Maschinen eingeschaltet wird. Die restliche Feuchtigkeit fällt als Schnee aus. Auf diese Weise entsteht ein Kühlaggregat von großer Einfachheit, das keinerlei schädliche Stoffe mehr verwendet und das einen sehr breiten Einsatzbereich hat, angefangen von Tiefkühlung über Klimatisierung bis hin zu Heizung von Gebäuden.Such a unit, which due to the relatively low pressures in air as a refrigerant and in the compensation of the axial forces by the common shaft ( 4 ) may also be built partially out of plastics, can be used in a wide temperature range if a water separator is used additional heat exchanger (recuperator) ( 5 ) between both machines is switched on. The remaining moisture falls out as snow. In this way, a cooling unit of great simplicity is created that no longer uses any harmful substances and that has a very wide range of uses, from freezing to air conditioning to heating buildings.

Claims (1)

Kühlaggregat großer Leistung mit Luft als Arbeitsmittel und nahezu isothermen Kompressionen, unter Verwendung von kontinuierlich arbeitenden, rotierenden Maschinen zur Förderung großer Volumenströme, wie sie beispielsweise mit Schrauben, ausgerüstet zur Verdichtung von Kältemitteldampfen her bekannt sind, dadurch gekennzeichnet, daß jeweils zwei dieser Maschinen auf gemeinsamer Welle als Kühlaggregat mit Luft als thermodynamischem Arbeitsmittel eingesetzt werden, wobei die erste Maschine unter Arbeitsaufnahme die Verdichtung der angesaugten Luft übernimmt, wobei die zweite Maschine unter Arbeitsabgabe die verdichtete Luft entspannt, unter der Maßgabe, daß die während der Verdichtung in der ersten Maschine anfallende Kompressionswärme über Wasser, das der zu verdichtenden Luft beigegeben wird, an das Wasser abgeführt wird, und zwar teilweise durch dessen Erwärmung, teilweise durch dessen Verdampfung, und wobei die derart weitgehend isotherm verdichtete Luft nach Abtrennen der Wasseranteile und nach Durchströmen eines rekuparativen Wärmetauschers mit weiterer Abkühlung durch Luft aus dem Kühlraum in die zweite Maschine eintritt, um dort auf sehr tiefe Temperaturen entspannt zu werden, wobei das abgetrennte Wasser nach Entzug der Kompressionswärme in einem externen Wärmetauscher im Kreislauf geführt, nicht nur den Wärmetransport sondern auch die Schmierung der beiden Maschinen übernimmt, so daß auf Öl als Schmiermittel verzichtet werden kann.Large capacity cooling unit with air as the working medium and almost isothermal compressions, using continuously operating, rotating machines for conveying large volume flows, such as are known, for example, equipped with screws for compressing refrigerant vapors, characterized in that two of these machines are on a common Shaft can be used as a cooling unit with air as the thermodynamic working fluid, the first machine taking over the compression of the sucked-in air while the work begins, the second machine relieving the compressed air while working, provided that the compression heat generated during the compression in the first machine via water, which is added to the air to be compressed, is discharged to the water, partly by heating it, partly by evaporating it, and the air, which is largely isothermally compressed in this way, after removal NEN of the water and after flowing through a recuperative heat exchanger with further cooling by air from the cooling room in the second machine in order to be relaxed there to very low temperatures, the separated water being circulated in an external heat exchanger after the compression heat has been removed, not takes over only the heat transport but also the lubrication of the two machines, so that oil as a lubricant can be dispensed with.
DE19924218299 1992-06-01 1992-06-01 High capacity refrigeration appts. for deep-freezing, air-conditioning or building heating - uses air as working medium compressed nearly isothermally and comprises continuously working rotating machines for delivering large vol. flows, e.g. with screws for compressing refrigerant vapour Pending DE4218299A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924218299 DE4218299A1 (en) 1992-06-01 1992-06-01 High capacity refrigeration appts. for deep-freezing, air-conditioning or building heating - uses air as working medium compressed nearly isothermally and comprises continuously working rotating machines for delivering large vol. flows, e.g. with screws for compressing refrigerant vapour

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924218299 DE4218299A1 (en) 1992-06-01 1992-06-01 High capacity refrigeration appts. for deep-freezing, air-conditioning or building heating - uses air as working medium compressed nearly isothermally and comprises continuously working rotating machines for delivering large vol. flows, e.g. with screws for compressing refrigerant vapour

Publications (1)

Publication Number Publication Date
DE4218299A1 true DE4218299A1 (en) 1993-12-02

Family

ID=6460301

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19924218299 Pending DE4218299A1 (en) 1992-06-01 1992-06-01 High capacity refrigeration appts. for deep-freezing, air-conditioning or building heating - uses air as working medium compressed nearly isothermally and comprises continuously working rotating machines for delivering large vol. flows, e.g. with screws for compressing refrigerant vapour

Country Status (1)

Country Link
DE (1) DE4218299A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016302A1 (en) * 1994-11-17 1996-05-30 Svenska Rotor Maskiner Ab System and method for performing cooling
WO1996026398A1 (en) * 1995-02-20 1996-08-29 Svenska Rotor Maskiner Ab Cooled air cycle system and method for operating such a system
EP0731323A2 (en) * 1995-03-07 1996-09-11 Ingenieurbüro Dr. Förster Method for producing cold with air as refrigerant and as primary coolant
DE102017127716A1 (en) * 2017-11-23 2019-05-23 Brandenburgische Technische Universität Cottbus-Senftenberg ISOTHERME COMPRESSION FOR A COOLING CIRCUIT

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DE-Z.: "Die Kälte- und Klimatechnik, Nr. 11/1991, S. 846-857 *
Lehrbuch der Kältetechnik, Band 1, 1995, von H.L. von Cube, S. 282-287 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016302A1 (en) * 1994-11-17 1996-05-30 Svenska Rotor Maskiner Ab System and method for performing cooling
US5732560A (en) * 1994-11-17 1998-03-31 Svenska Rotor Maskiner Ab System and method for performing cooling
WO1996026398A1 (en) * 1995-02-20 1996-08-29 Svenska Rotor Maskiner Ab Cooled air cycle system and method for operating such a system
US5642629A (en) * 1995-02-20 1997-07-01 Svenska Rotor Maskiner Ab Cooled air cycle system and method for operating such a system
EP0731323A2 (en) * 1995-03-07 1996-09-11 Ingenieurbüro Dr. Förster Method for producing cold with air as refrigerant and as primary coolant
EP0731323A3 (en) * 1995-03-07 1997-06-04 Ingbuero Dr Foerster Method for producing cold with air as refrigerant and as primary coolant
DE102017127716A1 (en) * 2017-11-23 2019-05-23 Brandenburgische Technische Universität Cottbus-Senftenberg ISOTHERME COMPRESSION FOR A COOLING CIRCUIT

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