EP0280752A1 - Méthode et appareil pour la régulation de la température d'une enceinte - Google Patents

Méthode et appareil pour la régulation de la température d'une enceinte Download PDF

Info

Publication number
EP0280752A1
EP0280752A1 EP87103014A EP87103014A EP0280752A1 EP 0280752 A1 EP0280752 A1 EP 0280752A1 EP 87103014 A EP87103014 A EP 87103014A EP 87103014 A EP87103014 A EP 87103014A EP 0280752 A1 EP0280752 A1 EP 0280752A1
Authority
EP
European Patent Office
Prior art keywords
temperature
heating
heat
heating circuit
actual
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.)
Withdrawn
Application number
EP87103014A
Other languages
German (de)
English (en)
Inventor
Hans Dr. Viessman
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.)
Viessmann Werke GmbH and Co KG
Original Assignee
Viessmann Werke GmbH and Co KG
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 Viessmann Werke GmbH and Co KG filed Critical Viessmann Werke GmbH and Co KG
Priority to EP87103014A priority Critical patent/EP0280752A1/fr
Publication of EP0280752A1 publication Critical patent/EP0280752A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F24D19/1024—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves a multiple way valve

Definitions

  • the invention relates to a method and a device for room temperature control, which is particularly suitable for heating systems of low output, e.g. suitable for heating a floor, and also taking into account short-term rapid changes in disturbance variables (e.g. by briefly opening windows) allows the generated heating power to be adapted to changing room temperatures, according to the preambles of claims 1 and 17, respectively.
  • the temperature and thus the amount of heat given off to a heat consumer arranged in a heating circuit is determined by the position of a mixing valve which mixes the heat transfer medium heated by a heat generator with the corresponding return of the heating circuit.
  • the position of the mixing valve is controlled by a control device, for example a two-point thermostat control device, via an actuating device, for example depending on the outside temperature.
  • a heating circuit circulating pump can also be provided in the heating circuit, the operation of which can also be coupled to the position of the mixing valve.
  • the thermostat or controller is usually connected to a temperature sensor located in the room to be heated.
  • a shutdown device for the circulation pump of a regulated heating system with a mixing valve is known, which is set up or delivered by actuating pulses according to the target / actual difference in temperature, in which to shutdown the circulation pump in a safe and less prone to failure
  • the total of the number of closed pulses following the last open pulse is summed in a counter and, when a predetermined and fixed total number is reached, the pump is switched off until the first open pulse switches it on again.
  • the room air temperature is used as a control variable, with a set room air temperature above the initial wall surface temperature.
  • the non-stationary heating phase is carried out using the room air temperature as a controlled variable until the wall surface temperature is only a maximum of a predetermined temperature difference lower than the desired room air temperature, and
  • the wall surface temperature is used as the control variable, specifying a target wall surface temperature, and the heat source is switched on when the wall surface temperature is below the lower limit of the switching hysteresis and the heat source is then switched off when the room air temperature exceeds the upper limit of the switching hysteresis, or if the wall surface temperature has already reached its setpoint before the room air temperature.
  • the inventive method for room temperature control in mono- and bivalent, central and decentralized heating systems operated with a liquid heat transfer medium with at least one with gaseous, solid and / or liquid fuel and / or electrically heated heat generator and a mixing valve provided with an actuator or a changeover valve between the heat generator and the heating circuit, which are controlled by a control device, and a heating circuit circulation pump arranged in the heating circuit, depending on a setpoint temperature specified by the control device and one from at least one temperature sensor measured actual temperature a manipulated variable for the heating output to be given to at least one heat consumer in the heating circuit and heat is given to the heating consumer with a given heating output if the actual temperature drops below the target temperature is characterized in that the heating output given to the consumer is increased continuously or continuously with a predetermined and optionally selectable control characteristic or suddenly in at least one step by a certain amount as soon as and at least as long as the actual temperature by one The given temperature difference has dropped below the target temperature.
  • the heating capacity can be increased by increasing the delivery capacity of the heating circuit circulating pump and / or the amount of heat transmitted by the mixing valve and / or the heating capacity of the heat generator and / or by switching over the switching valve or increasing the pulse duty factor in the case of a pulse-controlled switching valve.
  • the amount of increase in heating power can be determined according to a predetermined program or can be graded in at least one stage.
  • the increased heating output is maintained at least until the actual temperature becomes higher than the target temperature reduced by the predetermined temperature difference and at most until the actual temperature exceeds the target temperature.
  • the amount of the increase in the heating power is determined as a function of the actual or a stored and possibly corrected theoretical mean outside temperature and / or the heat requirements of the heat consumers.
  • the amount of increase in heating power can be determined depending on the position of the mixing valve.
  • the room air temperature, the outside temperature, the wall temperature or the temperature of the heat transfer medium heated by the heat generator can be recorded as the actual temperature.
  • the target temperature of the heat generator or a boiler and / or the flow temperature after the mixing valve can be controlled according to the actual or a stored and possibly corrected theoretical average outside temperature.
  • control devices are advantageously designed in such a way that the heating output is increased stepwise or continuously or continuously according to a predetermined control characteristic.
  • control device can be designed such that the amount of the increase in the heating power is determined as a function of the actual or a stored and possibly corrected theoretical mean outside temperature and / or the heat demand of the heat consumers.
  • the compensation element advantageously has a first timer which delays the delivery of the control signal by a certain short period of time from the time the heating circuit circulation pump is switched on under base load conditions.
  • the predetermined temperature difference is advantageously approximately 2 to 3 K.
  • the control device can advantageously work as a two-point controller which controls the heat generator, the heating circuit circulating pump and / or the mixing valve or the switching valve or valves.
  • control device has an additional second controller output, which also controls the heat generator, the heating circuit circulation pump and / or the mixing valve or the switching valve (s) and to increase the heating output is activated when the actual temperature has dropped below the target temperature by at least the specified temperature difference.
  • control device can also be designed as a three-point controller, which controls the heat generator, the heating circuit circulating pump and / or the mixing valve or the switching valve or valves.
  • control device can also work as a continuous controller.
  • control device can also be advantageous to equip the control device with a variable control characteristic.
  • control device has a second timer which, when the heating circuit circulation pump is switched on under base load conditions, triggers the heating circuit circulation pump under full load conditions for a predetermined period of time in order to ensure reliable starting.
  • the second timer advantageously specifies a time period of approximately 1 to 2 seconds.
  • the invention provides an advantageous method and an advantageous device for room temperature control, with a relatively roomy measure in the control device for a sudden temperature drop with a preferably dampened increase in the heating output producing a comfortable room temperature again.
  • the invention thus creates a simple, inexpensive and also comfortable room temperature control, by means of which the heat is metered from the heat generator to consumers, cracking noises in the pipe system can be avoided and electrical energy can be saved.
  • FIG. 1a shows a heating system with the device according to the invention.
  • the heating system consists of a heat generator WP, which is shown here as a burner for liquid or gaseous fuels.
  • the heat generator WP has two power levels I and II.
  • the heat generator WP heats a heat transfer medium W in a boiler K to the temperature ⁇ W.
  • the heated to the temperature ⁇ W in the boiler K heat transfer medium W contains the amount of heat Q1, which is completely or partially given to a heating circuit U depending on the position of a changeover valve U.
  • the amount of heat given off to the heating circuit Q2 is accordingly determined on the one hand by the position of the changeover valve U and on the other hand by the delivery rate of a heating circuit circulation pump HP.
  • the delivery rate of the heating circuit circulation pump HP can be selected in two output levels I and II.
  • the Q2 delivered to the heating circuit H by the primary amount of heat generated is consumed by a heat consumer HK in the heating circuit H. To simplify matters, it is assumed that there are no losses in the heating system in the heating circuit H.
  • the respective power levels of the heat generator WP or the heating circuit circulation pump HP and the position of the changeover valve U are each set by actuators MWP, MHP or, MM, which in turn receive control signals from a control device R.
  • the control device R receives signals about the target temperature ⁇ RSoll and the actual temperature ⁇ R as well as a feedback signal FB indicating the position of the changeover valve U.
  • the actual temperature ⁇ R can be an air temperature measured in a room, a wall temperature, the temperature in the flow of the heat transfer medium or the outside temperature.
  • a suitable combination of the temperatures mentioned can also be used to determine a control deviation of the actual temperature ⁇ R from the set temperature ⁇ Rset .
  • the manipulated variable of the controller can have a two-point behavior, three-point behavior or a constant behavior.
  • Simple thermostat controls, e.g. B. are equipped with bimetal as a temperature-dependent switch, always have a switching hysteresis, which causes a certain small tolerance range around the set target temperature.
  • the control device R emits a control signal at a first output S I , which carries out the desired regulation as long as the temperature difference between the actual temperature and the target temperature is less than a predetermined temperature difference ⁇ . It is assumed that this temperature difference ⁇ is greater than the temperature tolerance around the target temperature ⁇ RSoll .
  • the control signal S I is input to the respective actuators MWP, MHP and MM.
  • the control device R now has a second output S II , which is a further control signal outputs as soon as the temperature difference between the actual temperature ⁇ R and the set temperature ⁇ Rset is greater than the specified temperature difference ⁇ .
  • the further control signal emitted at this second output S II of the control device R sets one or more of the devices WP, HP or M via the control sliders MPW, MHP and MM in such a way that their heating power is increased.
  • the second output stage II of the heat generator WP and / or the second output stage II of the heating circuit circulation pump HP and / or a position of the changeover valve U is set by the further control signal output at further output S II of the control device R. in the latter, the amount of heat Q2 in the heating circuit H increases.
  • the changeover valve U is replaced by a mixing valve M, the position of which determines the amount of Q2 given to the heating circuit of the primary amount of heat generated Q1.
  • a heat pump is shown in FIG. 1b as the heat generator WP, which heats the heat transfer medium W in the boiler K to the temperature ⁇ W.
  • the heat pump is also shown here with two power levels I and II.
  • FIGS. 1a and 1b The functioning of the device according to the invention shown in FIGS. 1a and 1b and the method according to the invention will now be described in more detail with reference to the diagrams shown in FIGS. 2a, 2b, 3a and 3b.
  • Fig. 2a shows a temperature response, for. B. the actual room temperature ⁇ R , over time t.
  • the temperature ⁇ R remains during the period up to the time t4 within the temperature range between ⁇ RSoll and ⁇ RSoll - ⁇ determined by the difference ⁇ .
  • the actual temperature falls below the level ⁇ RSoll - ⁇ .
  • the actual temperature again exceeds the level ⁇ RSoll - ⁇ and then quickly increases to the set temperature ⁇ RSoll until time t6 .
  • FIG. 2 b now shows the power levels associated with the temperature response according to FIG. 2 a , as are caused by the outputs S I and S II of the control device R. Shifts are shown over time t, which selectively set one or more of the actuators MWP, MHP and MM.
  • the switching operations effected by means of the output S I of the control device R are known from conventional control devices, e.g. B. known with two-point behavior and are not described further.
  • FIG. B conventional control devices
  • a further control signal can be emitted at output S II , which signals the second power stage via the respective actuators MWP, MHP or MM switches on.
  • the second power stage of the circulation pump is fundamentally controlled for a short period of time in order to ensure reliable starting.
  • the second power stage can also by a small time ⁇ t compared to the switching times, for. B t1, t3 and t4 are switched on with a delay.
  • the delay is either due to the damping of the room temperature sensor and / or an integrating element in the control loop, e.g. B. a timer.
  • the room temperature sensor is an advantage designed so that it is subject to temperature changes and signals them faster than the wall, but more slowly than the room air. For example, cracking noises in the heating pipes and radiators can be largely reduced.
  • the heating circuit circulation pump HP By increasing the power of the heat generator WP, the heating circuit circulation pump HP and further opening the mixing valve M or the open position of the changeover valve U, the heating power delivered to the consumer HK in the heating circuit H increases.
  • the further actuating signal of the compensation element K at the second output S II of the control device R can cause the second power stage to remain switched on until the actual temperature exceeds the level oll RSoll - ⁇ (time t5) or until the temperature exceeds the set temperature ⁇ RSoll (time t6 or t 6 ⁇ ).
  • the gradient of the temperature increase over time that is to say d d R / dt, can be increased from time t5.
  • the temperature gradient should not be too high.
  • the duration of the second power stage can also be ended by means of the control signal emitted at the second output S II of the control device R after an expediently predetermined period of time, which depend on operating parameters of the heating system.
  • the point in time at which the second power stage is ended can be expediently and independently of the intersection points of the by a further, possibly variable timer in the control device R.
  • Actual temperature can be determined with the temperature levels ⁇ RSoll or ⁇ RSoll - ⁇ according to Fig. 2a.
  • the invention can advantageously also be carried out with continuously or continuously changing output values of the heat generator WP, the heating circuit circulation pump HP and / or those transmitted by the mixing valve M. Realize heating power.
  • 3a shows a further temperature response over time, starting with the time tenfin or t4 + ⁇ t, at which the second control signal is generated at the second output S II of the control device R. At this point in time, the actual temperature drops below the level ⁇ RSoll - ⁇ .
  • a first temperature response a in solid lines and a second temperature response b are shown in dashed lines, which then take different courses a1, a2 and b1, b2, respectively.
  • FIG. 3 b shows three power levels over time t, which are correlated with the temperature responses shown in FIG. 3 a due to the inventive concept.
  • the control signal generated by the control device R at the output S II at the time t4 or t4 + ⁇ t corresponds to a specific amount of the increase in power.
  • the amount of the increase in output can depend on the outside temperature and / or the heat requirement of the consumer.
  • Fig. 3b two cases are drawn, in which at the time t dioxide or t4 + ⁇ t the output of the heat generator, the heating circuit pump and / or the mixing valve M is increased based on a basic output by one or two stages.
  • the increase by one level drawn in full lines in FIG. 3b corresponds to the case shown in FIG. 2b.
  • the increase in output can also be ended here, as in the case shown in FIG. 2b, either at the point in time at which the actual temperature exceeds the temperature level ⁇ RSoll - ⁇ or the temperature level ⁇ RSoll .
  • the temperature increase can be terminated at an appropriate point in time which is selected as a function of operating parameters of the heating system.
  • the output of the heating system provided in the heating system which can be varied in terms of its output, heat generator WP, heating circuit circulation pump HP and / or mixing valve M can, according to what has been said above, in a simple manner by means of the control signal R of the control unit R generated at the second output S II in stages or continuously, for example in Depending on the outside temperature and / or the heat requirement of the consumer, vary.
  • the amount of power increase brought about by the heating circuit circulation pump HP, the heat generator WP and / or the position of the mixing valve M can also be continuously or continuously according to a predetermined control program, eg depending on the actual or a stored theoretical average outside temperature and / or the heat demand of the heat consumers.
  • control device is expediently program-controlled and advantageously contains a microcomputer.
  • FIGS. 1a and 1b have heat generators WP in the form of a burner or a heat pump
  • the invention can be used with any central and decentralized heating systems working with a liquid heat transfer medium with at least one with gaseous, solid and / or Use liquid fuel and / or an electrically heated boiler.
  • the heating system shown as an example in FIG. 1 has only one heating circuit H with one consumer HK.
  • the invention can also be used in heating systems with a plurality of heating circuits, each of which contains several HK consumers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
EP87103014A 1987-03-04 1987-03-04 Méthode et appareil pour la régulation de la température d'une enceinte Withdrawn EP0280752A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87103014A EP0280752A1 (fr) 1987-03-04 1987-03-04 Méthode et appareil pour la régulation de la température d'une enceinte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87103014A EP0280752A1 (fr) 1987-03-04 1987-03-04 Méthode et appareil pour la régulation de la température d'une enceinte

Publications (1)

Publication Number Publication Date
EP0280752A1 true EP0280752A1 (fr) 1988-09-07

Family

ID=8196800

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103014A Withdrawn EP0280752A1 (fr) 1987-03-04 1987-03-04 Méthode et appareil pour la régulation de la température d'une enceinte

Country Status (1)

Country Link
EP (1) EP0280752A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729086A2 (fr) * 1995-02-25 1996-08-28 TEKMAR ANGEWANDTE ELEKTRONIK GmbH Procédé et dispositif pour réguler un système de chauffage par température basse
EP1204014A2 (fr) * 2000-11-06 2002-05-08 Techem Service Aktiengesellschaft & Co. KG Régulation pour un chauffage par le sol ou un chauffage mixte sol/radiateurs
GB2427934A (en) * 2005-07-01 2007-01-10 Call Res & Design Ltd 1 Central heating control
WO2012085260A2 (fr) * 2010-12-24 2012-06-28 Robert Bosch Gmbh Procédé de régulation d'un générateur de chaleur d'un système de chauffage et système de chauffage
CN114992802A (zh) * 2022-05-16 2022-09-02 青岛海尔空调电子有限公司 用于列间空调加热控制的方法及装置、列间空调

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032089A1 (de) * 1980-08-26 1982-03-04 Hans Ing.(grad.) 5062 Forsbach Lamberti Abschalteinrichtung fuer die umwaelzpumpe einer geregelten heizanlage mit mischventil
US4379483A (en) * 1981-08-17 1983-04-12 The Coleman Company, Inc. Method of controlling heating and cooling sources
DE3310367A1 (de) * 1983-03-22 1984-10-04 Viessmann Werke Kg, 3559 Allendorf Verfahren und vorrichtung zur einzelraumtemperaturregelung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032089A1 (de) * 1980-08-26 1982-03-04 Hans Ing.(grad.) 5062 Forsbach Lamberti Abschalteinrichtung fuer die umwaelzpumpe einer geregelten heizanlage mit mischventil
US4379483A (en) * 1981-08-17 1983-04-12 The Coleman Company, Inc. Method of controlling heating and cooling sources
DE3310367A1 (de) * 1983-03-22 1984-10-04 Viessmann Werke Kg, 3559 Allendorf Verfahren und vorrichtung zur einzelraumtemperaturregelung

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0729086A2 (fr) * 1995-02-25 1996-08-28 TEKMAR ANGEWANDTE ELEKTRONIK GmbH Procédé et dispositif pour réguler un système de chauffage par température basse
EP0729086A3 (fr) * 1995-02-25 1998-03-18 TEKMAR ANGEWANDTE ELEKTRONIK GmbH Procédé et dispositif pour réguler un système de chauffage par température basse
EP1204014A2 (fr) * 2000-11-06 2002-05-08 Techem Service Aktiengesellschaft & Co. KG Régulation pour un chauffage par le sol ou un chauffage mixte sol/radiateurs
EP1204014A3 (fr) * 2000-11-06 2005-01-19 Techem Service Aktiengesellschaft & Co. KG Régulation pour un chauffage par le sol ou un chauffage mixte sol/radiateurs
GB2427934A (en) * 2005-07-01 2007-01-10 Call Res & Design Ltd 1 Central heating control
GB2427934B (en) * 2005-07-01 2009-12-30 Call Res & Design Ltd 1 Improvements in or relating to control apparatus
WO2012085260A2 (fr) * 2010-12-24 2012-06-28 Robert Bosch Gmbh Procédé de régulation d'un générateur de chaleur d'un système de chauffage et système de chauffage
WO2012085260A3 (fr) * 2010-12-24 2013-05-02 Robert Bosch Gmbh Procédé de régulation d'un générateur de chaleur d'un système de chauffage et système de chauffage
CN114992802A (zh) * 2022-05-16 2022-09-02 青岛海尔空调电子有限公司 用于列间空调加热控制的方法及装置、列间空调

Similar Documents

Publication Publication Date Title
DE2714511C2 (de) Vorrichtung zur Regelung der Vorlauftemperatur in einer Sammelheizungsanlage
DE3145215A1 (de) Thermostateinrichtung
EP0282886A2 (fr) Procédé de régulation de la température de départ dans une installation de transport de chaleur
EP0280752A1 (fr) Méthode et appareil pour la régulation de la température d'une enceinte
DE3325993C2 (de) Regeleinrichtung zum Regeln der Temperatur eines zu Heizkörpern vorlaufenden Wärmeträgers
DE3517902C2 (fr)
EP0119313A2 (fr) Procédé et dispositif de régulation de température d'espaces individuels
EP0433215A1 (fr) Méthode et appareil pour contrôler la circulation d'eau chaude dans une chaudière à gaz
EP0556736A1 (fr) Procédé pour la commande d'une chaudière
DE2321548A1 (de) Verfahren zur regelung und ueberwachung einer heizanlage fuer raumheizung und brauchwarmwasser-bereitung mit einem gasbrenner
DE2529858C2 (de) Verfahren und Vorrichtung zum Regeln einer Wärmeübertragungsanlage
DE10054897B4 (de) Regelung für Fußbodenheizungen oder kombinierte Fußboden- und Radiatorheizungen
DE4331917C2 (de) Verfahren zum Steuern einer Heizungsanlage
EP0387702B1 (fr) Procédé de réglage de la température de l'eau de départ respectivement de retour d'une installation de chauffage
EP0107774B2 (fr) Dispositif de régulation pour une installation de chauffage
DE10066125B4 (de) Verfahren und Vorichtung zur Aufbereitung einer Ansteuergröße eines Stellantriebs
DE10005856B4 (de) Verfahren und Vorrichtung zur Regelung einer Größe in einer Heizanlage
DE3923030A1 (de) Steuerung eines umlaufwasserheizers
AT397854B (de) Verfahren zur steuerung eines kessels
DE3702080A1 (de) Verfahren zum steuern der umschaltung eines waermeaufnehmenden verbrauchers zwischen einer brennstoff- oder strombeheizten waermequelle und einer waermepumpe und einrichtung zur durchfuehrung des verfahrens
AT403414B (de) Verfahren zur kesselrücklauftemperatur-regelung
DE19737250C2 (de) Steuerungsvorrichtung für Heizanlagen
DE4413186A1 (de) Verfahren zur Kesselrücklauftemperatur-Regelung
AT380969B (de) Einrichtung zur temperaturabhaengigen regelung der waermeabgabe oder waermeaufnahme von heizoder kuehlkoerpern
DE2053281C3 (de) Heizgerät mit Speichereigenschaft

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890308

RIN1 Information on inventor provided before grant (corrected)

Inventor name: VIESSMAN, HANS, DR.