FR2505466A1 - Refrigeration or air conditioning system - computer controlling use of individual cooling units and compressors - Google Patents

Refrigeration or air conditioning system - computer controlling use of individual cooling units and compressors Download PDF

Info

Publication number
FR2505466A1
FR2505466A1 FR8109565A FR8109565A FR2505466A1 FR 2505466 A1 FR2505466 A1 FR 2505466A1 FR 8109565 A FR8109565 A FR 8109565A FR 8109565 A FR8109565 A FR 8109565A FR 2505466 A1 FR2505466 A1 FR 2505466A1
Authority
FR
France
Prior art keywords
air conditioning
compressors
conditioning system
refrigeration
cold
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
FR8109565A
Other languages
French (fr)
Other versions
FR2505466B1 (en
Inventor
Francois Galian
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.)
Quiri Cie SA Usines
Original Assignee
QUIRI CIE SA USINES
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 QUIRI CIE SA USINES filed Critical QUIRI CIE SA USINES
Priority to FR8109565A priority Critical patent/FR2505466B1/fr
Publication of FR2505466A1 publication Critical patent/FR2505466A1/en
Application granted granted Critical
Publication of FR2505466B1 publication Critical patent/FR2505466B1/fr
Application status is Expired legal-status Critical

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1927Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1932Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces
    • G05D23/1934Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces each space being provided with one sensor acting on one or more control means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • F25B49/022Compressor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/20Humidity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/40Pressure, e.g. wind pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2400/00General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07Details of compressors or related parts
    • F25B2400/075Details of compressors or related parts with parallel compressors
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies
    • Y02B30/76Centralised control
    • Y02B30/765Centralised control of refrigeration machines, plants or systems, including combined heating and refrigeration systems or heat-pumps

Abstract

The refrigeration of air conditioning system includes a programmable computer controlling the compressors (2) so that they are either fully operational, or off. The computer also controls the cooling provided by a number of units (3) in different rooms, according to the selected programme, and also according to the signals provided by detectors (4) in each of the conditioned rooms. The controlling computer has a display panel which includes a number of sets of indicator lights in vertical lines. Alongside each of the lights there is a space provided for a written explanation of its function. The unit has connectors on the back, so that it may be linked by a standard bus to other controlling components.

Description

La présente invention concerne le domaine de la régulation d'installations frigorifiques ou de climatisation, et a pour objet un procédé de régulation automatique de telles installations. The present invention relates to the field of regulation of refrigeration systems or air conditioning, and relates to an automatic method for regulating such facilities.

L'invention a également pour objet un automate programmable pour la mise en oeuvre de ce procédé. The invention also relates to a programmable controller for carrying out said method.

Actuellement, les installations frigorifiques ou de climatisation existantes, par exemple les installations frigorifiques à plusieurs chambres froides comportent un ou plusieurs compresseurs frigorifiques équipés d'une régulation par paliers et destinés à produire les besoins des diverses chambres. Currently, existing refrigeration systems or air conditioning, for example refrigeration plants several cold rooms have one or more refrigeration compressors equipped with speed control in steps and for providing the needs of the various rooms.

Ainsi, chaque site d'utilisation commande la mise en marche ou l'arrêt de sa consommation, suivant son état, par enclenchement ou par déclenchement d'un thermostat, sans tenir compte de l'état de la demande des autres sites et es compresseurs, de sorte que la régulation de ces derniers doit suivre les variations des besoins. Thus, each control operates the site starting or stopping its consumption, according to his state, by switching or by triggering a thermostat, regardless of the status of the application of other sites and are compressors , so that the regulation of these must follow the changes needed.

Dans ces installations connues, les compresseurs fonctionnent donc avec une charge fortement variable dans le temps et un très mauvais rendement énergétique, qui est agravé d'autant que la température d'évaporation est basse. In these known installations, compressors therefore operate with a highly variable load in time and a very poor energy efficiency, which is agravé especially as the evaporation temperature is low. Ainsi, il peut arriver qu'un compresseur démarre pour n'alimenter qu'une seule chambre froide. So it can happen that a compressor starts to supply only one cold room.

La présente invention a pour but de pallier ces inconvénients. The present invention aims to overcome these drawbacks.

Elle a, en effet, pour objet un procédé de régulation automatique d'installations frigorifiques ou de climatisation, caractérisé en ce qu'il consiste essentiellement à réguler au moyen d'un automate programmable le ou les compresseurs, de telle sorte que seules les positions marche à 100 X et arrêt total soient possibles, et à munir les locaux à réfrigérer ou à climatiser de capteurs analogiques de température, d'humidité ou de pression, ou encore des capteurs du type thermostat, hygrostat, ou pressostat à plage neutre, c'est-à-dire présentant une position de seuil haut, une position de seuil bas, et une position intermédiaire flottante, transmettant leurs informations au microprocesseur de l'automate, qui déclenche ou arrête la production de froid ou de climatisation dans les positions extrêmes, et qui choisit, selon son programme, l'arrêt ou la production de froid ou de climatisation afin d'utiliser le ou les compresseurs à la puissance maximum ou de les main It has, in fact, provides an automatic method for controlling refrigeration systems or air conditioning system, characterized in that it essentially consists in controlling by means of a PLC or the compressors, so that only the positions running at 100 X and total judgment are possible, and to provide the local to be cooled or air conditioned analog temperature sensors, humidity or pressure, or the type of sensors thermostat, humidistat, or switch to neutral range, c that is to say having a high threshold position, a low threshold position, and a floating intermediate position, transmitting their information to the microprocessor of the controller, which starts and stops the production of cold or cooling in the extreme positions , and chooses, according to its program, termination or production of cold or air conditioning or to use the compressor at full power or hand tenir à l'arrêt. hold off.

L'invention a également pour objet un automate programmable pour la mise en oeuvre du procédé décrit ci-dessus, caractérisé en ce qu'il est muni d'une carte permettant le montage en partie arrière de deux connecteurs dont l'un sert au raccordement au bus standard et l'autre sert au raccordement des entrées et sorties des divers états commandés, ces diverses entrées et sorties étant visualisées en face avant grâce à des voyants lumineux correspondants affectés chacun du texte explicatif de l'état concerné. The invention also relates to a programmable controller for carrying out the method described above, characterized in that it is provided with a map to the rear mounting portion of two connectors, one of which serves to connect standard bus and the other serves to connect the inputs and outputs of the various states controlled, these various inputs and outputs being viewed in front through the corresponding LEDs each assigned the explanatory text of the state concerned.

L'invention sera mieux comprise qrâce à la description ci-après, qui se rapporte à un mode de réalisation préféré, donné à titre d'exemple non limitatif et expliqué avec référence aux dessins schématiques annexés, dans lesquels la figure 1 est un schéma par blocs expliquant le procédé conforme à l'invention la figure 2 représente un diagramme de fonctionnement d'un automate, et la figure 3 est une vue en perspective d'un automate programmable selon l'invention. The invention will be better understood qrâce the description below, which relates to a preferred embodiment, given by way of nonlimiting example and explained with reference to the accompanying schematic drawings, in which Figure 1 is a diagram blocks explaining the process according to the invention Figure 2 shows a flow diagram of a robot, and Figure 3 is a perspective view of a programmable controller according to the invention.

Conformément à l'invention, et comme le montre plus particulièrement, à titre d'exemple, la figure 1 des dessins annexés, le procédé de régulation automatique d'installations friqorifiques ou de climatisation consiste essentiellement à réguler au moyen d'un automate programmable 1 les compresseurs 2, de telle sorte que seules les positions marche à 100 % et arrêt total soient possibles, et à munir les locaux 3 à réfrigérer ou à climatiser de capteurs analogiques 4 de température, d'humidité ou de pression, à plage neutre, transmettant leurs informations à l'automate 1. According to the invention, and as shown more particularly by way of example, Figure 1 of the accompanying drawings, the automatic control method or cooling installations friqorifiques consists essentially regulating by means of a PLC 1 the compressor 2, so that only the positions on to 100% and total judgment are possible, and of providing local 3 to be cooled or air conditioned analog sensor 4 of temperature, humidity or pressure to neutral range, transmitting their information to the controller 1.

Les capteurs analogiques 4 sont des capteurs qui donnent un signal proportionnel à la valeur de la mesure soit en tension, soit en courant. Analog sensors 4 are sensors that provide a signal proportional to the measured value for either voltage or current. Cette information de tension ou de courant est transformée par un microprocesseur esclave en valeur digitale et transmise par celui-ci au microprocesseur central. This voltage or current information is transformed by a slave microprocessor into a digital value and transmitted by the latter to the central microprocessor. Le microprocesseur central possède les valeurs digitales des différents seuils, seuil bas, seuil haut, par rapport à la valeur de consigne. The central microprocessor has digital values ​​of the different thresholds, low threshold, high threshold, relative to the setpoint. Ceci permet le règlage par programmation de la valeur de consiqne devant toujours être maintenue entre les seuils haut et bas fixés également par programmation. This allows trimming by programming the value of consiqne always to be maintained between the upper and lower thresholds also programmatically.

Ainsi, comme le montre plus spécialement la figure 2, le microprocesseur de l'automate 1, dans le cas d'un fonctionnement en machine frigorifique, donne un ordre de mise en marche d'un ou de plusieurs compresseurs lorsque le signal 5 reçu d'un ou de plusieurs capteurs 4 dépasse le seuil haut 6, de manière à ramener la valeur de consiqne du ou des locaux 3 correspondants entre les valeurs de seuil haut 6 et de seuil bas 7. Lorsque le signal reçu 5 se trouve entre seuil haut 6 et seuil bas 7 pour les capteurs 4 de tous les locaux 3, le microprocesseur de l'automate 1 choisit, selon son programme l'arrêt ou la production de froid dans l'un ou dans plusieurs locaux 3, ainsi que le fonctionnement d'un ou de plusieurs compresseurs 2 à pleine puissance ou leur maintien à l'arrêt.Dès que le signal 5 dépasse le seuil bas 7 l'automate 1 délivre un signal d'arrêt de production frigorifique à chaque local 3. Thus, as more particularly shown in Figure 2, the microprocessor of the controller 1 in the case of operation as a refrigerator gives a start command of one or more compressors when the received signal 5 one or several sensors 4 exceeds the upper threshold 6, so as to bring the value of the consiqne or spaces 3 between the corresponding upper threshold values ​​6 and 7. When the low threshold received signal 5 is between the top threshold 6 and 7 low threshold for the sensors 4 of all local 3, the microprocessor of the controller 1 selects, according to its program shutdown or cold production in one or in several rooms 3, and the operation of one or more compressors 2 at full power or keeping them arrêt.Dès the signal 5 exceeds the low threshold 7 the controller 1 outputs a refrigerating shutdown signal to each local 3.

Ainsi, le microprocesseur de l'automate 1 analyse continuellement l'état de chaque capteur 4, et donc l'ambiance règnant dans les différents locaux 3 pour déterminer, en fonction de son programme, les besoins de chaque local 3 et pour délivrer les ordres de production ou d'arrêt de froid individuels ou commun ainsi que les ordres de mise en marche ou d'arrêt d'un ou de plusieurs compresseurs 2. Thus, the microprocessor of the controller 1 analyzes continuously the state of each sensor 4, and so the atmosphere prevailing in the various local 3 to determine, according to its program, the needs of each local 3 and for outputting the orders production or individual or common cold stop and the switch-on command or stop one or more compressors 2.

L'invention a éqalement pour objet un automate programmable 1 pour la mise en oeuvre du procédé décrit ci-dessus. The invention éqalement relates to a programmable computer 1 for carrying out the method described above.

Cet automate est avantageusement muni d'une carte 8 permettant le montage en face arrière de deux connecteurs 9 et 10 dont l'un sert au raccordement au bus standard et l'autre sert au raccordement des entrées et sorties des divers états commandés. This controller is preferably provided with a card 8 for mounting on the rear of the two connectors 9 and 10 of which one is used to connect the standard bus and the other serves to connect the inputs and outputs of various ordered states.

Sur la face avant, l'automate 1 est pourvu de voyants lumineux 11 de visualisation de l'état des diverses entrées et sorties un texte en clair 12 correspondant à chaque état concerné étant affecté à chaque voyant 11. On the front, the controller 1 is provided with LEDs 11 display the condition of the various inputs and outputs a plaintext 12 corresponding to each respective state being assigned to each LED 11.

Grâce à ce mode de réalisation, les connexions, en particulier des entrées et sorties, n'encombrent plus la face avant des automates, et la visualisation des différents états est plus claire. With this embodiment, the connections, particularly input and output, not cluttering the front of the PLC, and visualization of different states is clearer. En effet, sur les automates existant actuellement, les raccordements des entrées et sorties sont effectués sur la face avant, de sorte qu'une partie du câblage de l'automate doit être réalisée en face avant et que la place disponible pour la visualisation est réduite à des voyants numérotés. Indeed, the existing controllers currently, the connections of the inputs and outputs are made on the front side, so that part of the PLC's wiring should be carried on the front and the space available for display is reduced to numbered LEDs. Ainsi l'exploitation des informations des voyants est assujettie à une consultation de notice explicative des divers états numérotés. Thus the operation of LEDs information is subject to a consultation leaflet various numbered states.

Dans l'automate conforme à l'invention, les voyants lumineux 11 indiquent ainsi les divers états de fonctionnement de compresseurs I à IV, ainsi que leur état de marche. In the PLC according to the invention, the LEDs 11 and show the various operating states of compressors I to IV as well as their operating condition.

En outre, dans la partie indiquant l'état de marche de chaque compresseur est prévu un interrupteur 13 affecté audit compresseur. Further, in the portion indicating the compressor each working condition is provided a compressor 13 assigned to said switch.

Grâce à l'invention, il est possible de réaliser une régulation automatique d'installations frigorifiques ou de climatisation, par exemple de chambres froides d'entre pôts d'abattoirs, ou encore une climatisation d'immeubles, en utilisant de manière optimale lesdites installations, c'està-dire en ne provoquant leur fonctionnement partiel ou total qu'après analyse des états des divers sites, chaque machine n'étant sollicitée qu'à sa puissance maximale ou étant maintenue à l'arrêt. Thanks to the invention, it is possible to achieve automatic control of refrigeration systems or air conditioning, for example cold storage warehouses of slaughterhouses, or air conditioning of buildings, using optimally these facilities , that is, by not causing their partial or total operation after analysis of various sites states, each machine being sought not only maximum power or being kept stationary.

Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit et représenté aux dessins annexés. Of course, the invention is not limited to the embodiment described and shown in the accompanying drawings. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments, ou par substitution d'équivalents techniques, sans sortir Pour autant du domaine de protection de l'invention. Modifications are possible, especially from the perspective of the composition of various elements or by substituting technical equivalents, without However from the scope of the invention.

Claims (2)

-REVENDICATIONS -REVENDICATIONS
1. Procédé de régulation automatique d'installations frigorifiques ou de climatisation, caractérisé en ce qu'il consiste essentiellement à réguler au moyen d'un automate programmable (1) le ou les compresseurs (2), de telle sorte que seules les positions marche à 100 % et arrêt total soient 1. A method of automatically regulating refrigeration systems or air conditioning system, characterized in that it essentially consists in controlling by means of a programmable automaton (1) or the compressor (2), so that only the step positions 100% and total judgment are
Dossibles, et à munir les locaux (3) à réfrigérer ou à climatiser de capteurs analoqiques (4) de température, d'humidité ou de pression, ou encore des capteurs du type thermostat, hygrostat, ou pressostat à plage neutre, c'est-à-dire présentant une position de seuil haut, une position de seuil bas, et une position intermédiaire flottante transmettant leurs informations au microprocesseur de l'automate, qui déclenche ou arrête la production de froid ou de climatisation dans les positions extrêmes, et qui choisit, selon son programme, l'arrêt ou la production de froid ou de climatisation afin d'utiliser le ou les compresseurs (2) à la puissance maximum ou de les maintenir à l'arrêt. Dossibles, and providing the premises (3) to be cooled or air conditioned analoqiques of sensors (4) temperature, humidity or pressure, or the type of sensors thermostat, humidistat, or switch to neutral range is -to say having a position high threshold, a low threshold position, and a floating intermediate position transmitting their information to the microprocessor of the controller, which starts and stops the production of cold or cooling in the extreme positions, and that chooses, according to its program, termination or production of cold or air conditioning or to use the compressor (2) at maximum power or to keep them off.
2. Automate programmable pour la mise en oeuvre du procédé suivant la revendication 1, caractérisé en ce qu'il est muni d'une carte (8) permettant le montage en partie arrière de deux connecteurs (9, 10) dont l'un sert au raccordement au bus standard et l'autre sert au raccordement des entrées et sorties des divers états commandés, ces diverses entrées et sorties étant visualisées en face avant qrace à des voyants lumineux correspondants (11) affectés chacun du texte explicatif (12) de l'état concerné. 2. A programmable controller for carrying out the method according to claim 1, characterized in that it is provided with a board (8) for mounting in the rear part with two connectors (9, 10) one of which serves connecting the standard bus and the other serves to connect the inputs and outputs of the various states controlled, these various inputs and outputs being viewed in front qrace to corresponding lights (11) each assigned the narrative (12) of state concerned.
FR8109565A 1981-05-08 1981-05-08 Expired FR2505466B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8109565A FR2505466B1 (en) 1981-05-08 1981-05-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8109565A FR2505466B1 (en) 1981-05-08 1981-05-08

Publications (2)

Publication Number Publication Date
FR2505466A1 true FR2505466A1 (en) 1982-11-12
FR2505466B1 FR2505466B1 (en) 1984-08-31

Family

ID=9258412

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8109565A Expired FR2505466B1 (en) 1981-05-08 1981-05-08

Country Status (1)

Country Link
FR (1) FR2505466B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161845A2 (en) * 1984-05-04 1985-11-21 Kysor Industrial Corporation Refrigeration monitor
FR2567634A1 (en) * 1984-07-13 1986-01-17 Bonnet Ets Refrigerating installation with operation adapted to climatic constraints
EP0410330A2 (en) * 1989-07-28 1991-01-30 York International GmbH Method and apparatus for operating a refrigeration system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933197A (en) * 1974-05-16 1976-01-20 Barber-Colman Company Control of heating and cooling available from central sources to a multi-zone temperature controlled space
EP0001377A1 (en) * 1977-08-31 1979-04-04 United Technologies Corporation Apparatus and method for energy saving control of heating, ventilating and airconditioning (HVAC) systems
US4235368A (en) * 1979-08-27 1980-11-25 Teledyne Industries, Inc. Thermostat assembly

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933197A (en) * 1974-05-16 1976-01-20 Barber-Colman Company Control of heating and cooling available from central sources to a multi-zone temperature controlled space
EP0001377A1 (en) * 1977-08-31 1979-04-04 United Technologies Corporation Apparatus and method for energy saving control of heating, ventilating and airconditioning (HVAC) systems
US4235368A (en) * 1979-08-27 1980-11-25 Teledyne Industries, Inc. Thermostat assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/80 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161845A2 (en) * 1984-05-04 1985-11-21 Kysor Industrial Corporation Refrigeration monitor
EP0161845A3 (en) * 1984-05-04 1988-04-27 Kysor Industrial Corporation Refrigeration monitor
FR2567634A1 (en) * 1984-07-13 1986-01-17 Bonnet Ets Refrigerating installation with operation adapted to climatic constraints
EP0410330A2 (en) * 1989-07-28 1991-01-30 York International GmbH Method and apparatus for operating a refrigeration system
EP0410330A3 (en) * 1989-07-28 1991-06-26 Brown Boveri-York Kaelte- Und Klimatechnik Gmbh Method of operating a refrigeration system

Also Published As

Publication number Publication date
FR2505466B1 (en) 1984-08-31

Similar Documents

Publication Publication Date Title
US6718213B1 (en) Variable base load energy management system and method
US8897923B2 (en) Achieving energy demand response using price signals and a load control transponder
US7379997B2 (en) System and method of controlling delivery and/or usage of a commodity
US6055163A (en) Communications processor remote host and multiple unit control devices and methods for micropower generation systems
US6408228B1 (en) Hybrid finite state machine environmental system controller
US8143811B2 (en) Lighting control system and method
US6026651A (en) Remote controlled defrost sequencer
US8954201B2 (en) Realization of energy savings potential through feedback
US5042265A (en) Controlling HVAC test functions
CA1301290C (en) Service thermostat
US9910577B2 (en) Prospective determination of processor wake-up conditions in energy buffered HVAC control unit having a preconditioning feature
US6892114B1 (en) Modifying irrigation schedules of existing irrigation controllers
KR100740051B1 (en) Method and apparatus for refrigeration system control having electronic evaporator pressure regulators
US20070156290A1 (en) Virtual Dial Irrigation Controller
US20010030468A1 (en) Method and apparatus utilized for priority sequencing
JP2635535B2 (en) Cabinet in the environment control system for refrigerated containers
DE69727164T2 (en) Distributed air conditioning system
US4439997A (en) Energy management system for multi stage refrigeration systems
US5586446A (en) Monitoring system for ice making machine
US5422550A (en) Control of multiple motors, including motorized pumping system and method
EP0227504B1 (en) Method of protecting a refrigeration plant against deposits of additives in the refrigerant circuit
US6607140B1 (en) Method for precise electric actuator control with reduced repositioning
US5546073A (en) System for monitoring the operation of a compressor unit
EP0321253A2 (en) Interface adapter for interfacing a remote controller with commercial refrigeration and environmental control systems
AU2002259066B2 (en) Model-based alarming

Legal Events

Date Code Title Description
ST Notification of lapse