ITBO20100564A1 - ELECTRIC PANEL DEVICE CONNECTED TO A REFRIGERATOR SYSTEM - Google Patents
ELECTRIC PANEL DEVICE CONNECTED TO A REFRIGERATOR SYSTEM Download PDFInfo
- Publication number
- ITBO20100564A1 ITBO20100564A1 IT000564A ITBO20100564A ITBO20100564A1 IT BO20100564 A1 ITBO20100564 A1 IT BO20100564A1 IT 000564 A IT000564 A IT 000564A IT BO20100564 A ITBO20100564 A IT BO20100564A IT BO20100564 A1 ITBO20100564 A1 IT BO20100564A1
- Authority
- IT
- Italy
- Prior art keywords
- refrigeration
- control circuit
- refrigeration unit
- control
- mechanical
- Prior art date
Links
- 238000005057 refrigeration Methods 0.000 claims description 50
- 230000004224 protection Effects 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 230000007717 exclusion Effects 0.000 claims description 2
- 230000037452 priming Effects 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
-
- 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
- F25B2400/00—General 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
- F25B2400/06—Several compression cycles arranged in parallel
-
- 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
- F25B2400/00—General 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
- F25B2400/22—Refrigeration systems for supermarkets
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Quality & Reliability (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Description
DISPOSITIVO A QUADRO ELETTRICO COLLEGABILE AD UN IMPIANTO FRIGORIFERO ELECTRICAL PANEL DEVICE THAT CAN BE CONNECTED TO A REFRIGERATOR SYSTEM
DESCRIZIONE DELL'INVENZIONE DESCRIPTION OF THE INVENTION
La presente invenzione s'inquadra nel settore concernente la refrigerazione e l’industria del freddo e si riferisce ad un dispositivo di comando per un impianto frigorifero particolarmente adatto a magazzini e celle frigorifere con necessità di levate potenze ed ovunque sia auspicabile la continuità della refrigerazione. The present invention is part of the refrigeration and cold industry sector and refers to a control device for a refrigeration system particularly suitable for warehouses and cold rooms with high power requirements and wherever the continuity of refrigeration is desirable. .
I magazzini, le celle frigorifere e simili adottano impianti frigoriferi che, per parzializzare la potenza frigorifera e garantire migliore affidabilità , sono provvisti di più gruppi frigoriferi ciascuno dotato di un compressore a motore elettrico collegato tramite un circuito del fluido frigorifero ad un rispettivo evaporatore e ad un rispettivo condensatore fornito di una propria ventola di raffreddamento azionata da un motore elettrico. Warehouses, cold rooms and the like adopt refrigeration systems which, to partialize the refrigeration capacity and ensure better reliability, are equipped with several refrigeration units, each equipped with an electric motor compressor connected via a refrigerant circuit to a respective evaporator and to a respective condenser provided with its own cooling fan driven by an electric motor.
Tali compressori e ventole elettrici sono elettricamente collegati a un quadro elettrico comprendente un circuito di comando comune azionato da un controllore elettronico in genere affiancato da un controllo meccanico d’emergenza che si azione automaticamente o manualmente. These compressors and electric fans are electrically connected to an electrical panel comprising a common control circuit operated by an electronic controller generally flanked by a mechanical emergency control which is activated automatically or manually.
Un guasto ad un compressore o ad una ventola o l’intervento delle rispettive protezioni causa la perdita della corrispondente capacità frigorifera ma i compressori e le ventole dei rimanenti gruppi continuano a garantire la refrigerazione. A fault in a compressor or a fan or the intervention of the respective protections causes the loss of the corresponding cooling capacity but the compressors and fans of the remaining units continue to guarantee refrigeration.
Le norme di sicurezza impongono di isolare il quadro elettrico dalla rete di alimentazione tramite uno o più trasformatori di alimentazione dei vari organi di tale quadro. The safety standards require the electrical panel to be isolated from the power supply network by means of one or more power transformers of the various parts of this panel.
In alcuni impianti noti un trasformatore di isolamento alimenta il circuito di comando ed il controllo meccanico mentre un ulteriore trasformatore alimenta il controllore elettronico; in altri impianti noti un unico trasformatore alimenta detti tre componenti del quadro elettrico. In some known systems an isolation transformer supplies the command circuit and the mechanical control while a further transformer supplies the electronic controller; in other known systems a single transformer supplies said three components of the electrical panel.
Uno svantaggio di tali quadri elettrici noti consiste nel fatto che à ̈ sufficiente il guasto di un solo trasformatore o l’intervento della rispettiva protezione per bloccare l’impianto ed interrompere la catena del freddo. A disadvantage of these known electrical panels consists in the fact that the failure of a single transformer or the intervention of the respective protection is sufficient to block the system and interrupt the cold chain.
Uno scopo della presente invenzione consiste nel proporre un dispositivo a quadro elettrico collegabile ad un impianto frigorifero dotato di più gruppi frigoriferi ed in grado di garantire la produzione del freddo anche in caso di guasti a più trasformatori d’isolamento. An object of the present invention is to propose an electrical panel device which can be connected to a refrigeration plant equipped with several refrigeration units and capable of guaranteeing the production of cold even in the event of faults to several insulation transformers.
Le caratteristiche dell'invenzione sono nel seguito evidenziate con particolare riferimento agli uniti disegni nei quali: The characteristics of the invention are highlighted below with particular reference to the accompanying drawings in which:
- la figura 1 illustra una vista schematica del dispositivo a quadro elettrico, oggetto della presente invenzione, collegato ad un impianto frigorifero avente una pluralità di gruppi frigoriferi di cui sono rappresentati i primi due ed, in tratteggio, l’ultimo degli eventuali ulteriori gruppi. - Figure 1 illustrates a schematic view of the electrical panel device, object of the present invention, connected to a refrigeration system having a plurality of refrigeration units of which the first two are represented and, in broken lines, the last of any further groups .
Con riferimento alla figura 1, con 1 viene indicato il dispositivo a quadro elettrico collegabile ad un impianto frigorifero oggetto della presente invenzione. With reference to Figure 1, 1 indicates the electrical panel device which can be connected to a refrigeration system object of the present invention.
Tale impianto frigorifero 30 comprende un insieme di gruppi frigoriferi 31 ciascuno dotato almeno di: un compressore elettrico 32, un evaporatore ed un condensatore, mutuamente collegati da un circuito del fluido frigorifero del rispettivo gruppo. Ciascun condensatore à ̈ provvisto di una rispettiva ventola elettrica 33 e ciascun gruppo 31 comprende inoltre una valvola capillare e gli altri elementi frigoriferi. Tutti gli elementi del gruppo ed il loro reciproco collegamento di flusso sono noti e sono normalmente disponibili sul mercato. This refrigeration system 30 comprises a set of refrigeration units 31 each equipped with at least: an electric compressor 32, an evaporator and a condenser, mutually connected by a circuit of the refrigerant fluid of the respective group. Each condenser is provided with a respective electric fan 33 and each group 31 further comprises a capillary valve and the other refrigerating elements. All the elements of the group and their reciprocal flow connection are known and are normally available on the market.
Tutti gli elementi elettrici del gruppo sono alimentati da una rete elettrica, ad esempio trifase a stella, tramite rispettivi mezzi di sezionamento 34, ad esempio a relé od allo stato solido, di tipo a controllo remoto. All the electric elements of the group are powered by an electric network, for example three-phase star, by means of respective disconnecting means 34, for example relay or solid state, of the remote control type.
Il dispositivo 1 comprende, per ciascuno dei gruppi frigoriferi 31, un mezzo a circuito di comando 2 alimentato da un rispettivo trasformatore d’isolamento 3 e collegato ai mezzi di sezionamento 34 del rispettivo gruppo frigorifero 31 per azionare tali mezzi di sezionamento 34 collegando elettricamente e scollegando il rispettivo compressore 32 e/o la rispettiva ventola 33 dalla linea elettrica di alimentazione. The device 1 comprises, for each of the refrigeration units 31, a control circuit means 2 powered by a respective isolation transformer 3 and connected to the sectioning means 34 of the respective refrigeration unit 31 to operate said sectioning means 34 by electrically connecting and disconnecting the respective compressor 32 and / or the respective fan 33 from the power supply line.
Il dispositivo 1 comprende,inoltre un mezzo di controllo 4, comune a tutti i gruppi 31, alimentato da un rispettivo trasformatore d’isolamento 5 e collegato a tutti i mezzi a circuito di comando 2 per accendere o spegnere il compressore 32 e/o la ventola 33 elettrici di ciascun gruppo 31 in modo programmato ed indipendente. Per ciascun gruppo frigorifero 31, 2 il dispositivo comprende un mezzo di comando meccanico 6 d’emergenza, collegato ai circuiti elettrici del dispositivo 1 in parallelo al corrispondente mezzo a circuito di comando 2 ed alimentato dal trasformatore d’isolamento 3 di tale mezzo a circuito di comando 2. In caso di guasto di un mezzo a circuito di comando 2, il funzionamento del corrispondente gruppo può essere comandato dal rispettivo mezzo di comando meccanico 6 d’emergenza che può entrare in funzione automaticamente o manualmente. The device 1 also comprises a control means 4, common to all the groups 31, powered by a respective isolation transformer 5 and connected to all the control circuit means 2 to switch on or off the compressor 32 and / or the electric fan 33 of each group 31 in a programmed and independent way. For each refrigeration unit 31, 2 the device comprises an emergency mechanical control means 6, connected to the electrical circuits of the device 1 in parallel to the corresponding control circuit means 2 and powered by the isolation transformer 3 of this means control circuit 2. In case of failure of a control circuit means 2, the operation of the corresponding group can be controlled by the respective mechanical emergency control means 6 which can be activated automatically or manually.
I mezzi a circuito di comando 2 e di comando meccanico 6 del medesimo gruppo frigorifero 31 sono mutuamente collegati ad esempio per la reciproca esclusione al fine di evitare conflitti di funzionamento. The control circuit means 2 and the mechanical control circuit 6 of the same refrigeration unit 31 are mutually connected, for example for mutual exclusion in order to avoid operating conflicts.
Nel caso, quasi generalizzato, in cui l’impianto frigorifero 30 à ̈ provvisto di mezzi di protezione 35, ciascuno associato alla linea elettrica di alimentazione del rispettivo compressore elettrico 32 o della rispettiva ventola elettrica 33, i mezzi a circuito di comando 2 e di comando meccanico 6 sono collegati elettricamente a detti mezzi di protezione 35 del rispettivo gruppo frigorifero 31 per spegnere il compressore e la ventola di quest’ultimo in caso di intervento di tali mezzi di protezione 35. Tali mezzi di protezione possono essere, ad esempio, di tipo sensibile al sovraccarico elettrico. In the almost generalized case in which the refrigeration system 30 is provided with protection means 35, each associated with the power supply line of the respective electric compressor 32 or of the respective electric fan 33, the control circuit means 2 and mechanical control devices 6 are electrically connected to said protection means 35 of the respective refrigeration unit 31 to switch off the compressor and the fan of the latter in case of intervention of said protection means 35. Such protection means can be, for example , of the type sensitive to electrical overload.
Nel caso d’impianto frigorifero 30 provvisto, per ciascun gruppo frigorifero 31, di un rispettivo mezzo a pressostato d’innesco 36, almeno i mezzi di comando meccanico 6 ed opzionalmente anche i mezzi a circuito di comando 2 sono collegati a tale mezzo a pressostato d’innesco 36 del rispettivo gruppo frigorifero 31 per la corretta sequenza d’avviamento e/o spegnimento del medesimo. In the case of a refrigeration system 30 provided, for each refrigeration unit 31, with a respective ignition pressure switch means 36, at least the mechanical control means 6 and optionally also the control circuit means 2 are connected to this means to start pressure switch 36 of the respective refrigeration unit 31 for the correct start-up and / or shutdown sequence of the same.
Ciascun mezzo a pressostato d’innesco 36 comprende un pressostato associato al circuito del fluido frigorifero del rispettivo gruppo frigorifero 31 ed un temporizzatore. Each starting pressure switch means 36 comprises a pressure switch associated with the refrigerant fluid circuit of the respective refrigeration unit 31 and a timer.
Nel caso di impianto frigorifero 30 provvisto, per ciascun gruppo frigorifero 31, di un rispettivo mezzo a selettore 37, almeno i mezzi di comando meccanico 6 ed opzionalmente i mezzi a circuito di comando 2 del corrispondente gruppo frigorifero 31 sono collegati al rispettivo mezzo a selettore 37. In the case of refrigeration system 30 provided, for each refrigeration unit 31, with a respective selector means 37, at least the mechanical control means 6 and optionally the control circuit means 2 of the corresponding refrigeration unit 31 are connected to the respective selector means 37.
I mezzi a pressostato d’innesco 36 di tutti i gruppi 31 sono reciprocamente collegati da una linea di coordinamento 7 destinata a coordinare tali gruppi. The trigger pressure switch means 36 of all the groups 31 are mutually connected by a coordination line 7 intended to coordinate these groups.
Il mezzo di controllo 4 à ̈ collegato almeno a mezzi rilevatori di condizioni ambientali, ad esempio temperatura, umidità , pressione, etc., associati all’impianto frigorifero 30 in particolare contenuti nei vani di installazione degli evaporatori ed in vicinanza dei condensatori. The control means 4 is connected at least to means for detecting environmental conditions, for example temperature, humidity, pressure, etc., associated with the refrigeration system 30 in particular contained in the installation compartments of the evaporators and in the vicinity of the condensers.
Il mezzo di controllo 4 Ã ̈ preferibilmente di tipo PLC od a microprocessore, i mezzi a circuito di comando 2 sono di tipo con interruttori allo stato solido o di tipo elettromeccanico ed i mezzi di comando meccanico 6 sono preferibilmente di tipo con interruttori meccanici od elettromeccanici oppure allo stato solido. The control means 4 is preferably of the PLC or microprocessor type, the control circuit means 2 are of the type with solid state switches or of the electromechanical type and the mechanical control means 6 are preferably of the type with mechanical or electromechanical switches or in the solid state.
L’operatività del dispositivo, ad esempio dotato dei tre gruppi illustrati in figura 1, prevede che in caso di guasto ad uno o più trasformatori 35 di due dei tre gruppi, causi l’arresto di uno od entrambi tali gruppi mentre il terzo gruppo può continuare a funzionare garantendo la continuità di refrigerazione. Il guasto del trasformatore 5 del mezzo di controllo 4 causa un arresto di quest’ultimo ma i gruppi frigoriferi possono continuare a funzionare comandati manualmente dai mezzi di comando meccanico 6. L’unico evento che potrebbe portare all’arresto completo dell’impianto consiste nel guasto o nell’intervento della protezione dei trasformatori 3 dei mezzi a circuito di comando 2 di tutti i gruppi frigoriferi dell’impianto, evento estremamente improbabile anche con un contenuto numero di gruppi. The operation of the device, for example equipped with the three groups illustrated in figure 1, foresees that in the event of failure of one or more transformers 35 of two of the three groups, it causes the stoppage of one or both of these groups while the third the unit can continue to function guaranteeing the continuity of refrigeration. The failure of the transformer 5 of the control means 4 causes the latter to stop but the refrigeration units can continue to operate manually controlled by the mechanical control means 6. The only event that could lead to the complete stop of the The system consists in the failure or intervention of the protection of the transformers 3 of the control circuit means 2 of all the refrigeration units in the system, an extremely unlikely event even with a limited number of units.
Un vantaggio della presente invenzione à ̈ di fornire un dispositivo a quadro elettrico collegabile ad un impianto frigorifero dotato di più gruppi frigoriferi ed in grado di garantire la produzione del freddo anche in caso di guasti a più trasformatori d’isolamento. An advantage of the present invention is to provide an electrical panel device that can be connected to a refrigeration system equipped with several refrigeration units and capable of guaranteeing the production of cold even in the event of failure of several isolation transformers.
Ulteriore vantaggio à ̈ di fornire un dispositivo in grado di garantire la totale sicurezza per gli operatori addetti all’impianto. Another advantage is to provide a device capable of guaranteeing total safety for the operators assigned to the system.
Altro vantaggio à ̈ di fornire un dispositivo robusto ed economico. Another advantage is to provide a robust and economical device.
Ulteriore vantaggio à ̈ di fornire un dispositivo che permetta di lasciare inalterata la logica di funzionamento dei gruppi e dell’impianto, già installati o di nuova installazione, che frigoristi ed utenti finali già conoscono. Another advantage is to provide a device that allows the operating logic of the groups and the system, already installed or newly installed, to be left unaltered, which refrigerators and end users already know.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO2010A000564A IT1402316B1 (en) | 2010-09-20 | 2010-09-20 | ELECTRIC PANEL DEVICE CONNECTED TO A REFRIGERATOR SYSTEM |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO2010A000564A IT1402316B1 (en) | 2010-09-20 | 2010-09-20 | ELECTRIC PANEL DEVICE CONNECTED TO A REFRIGERATOR SYSTEM |
Publications (2)
Publication Number | Publication Date |
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ITBO20100564A1 true ITBO20100564A1 (en) | 2012-03-21 |
IT1402316B1 IT1402316B1 (en) | 2013-08-30 |
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Application Number | Title | Priority Date | Filing Date |
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ITBO2010A000564A IT1402316B1 (en) | 2010-09-20 | 2010-09-20 | ELECTRIC PANEL DEVICE CONNECTED TO A REFRIGERATOR SYSTEM |
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IT (1) | IT1402316B1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4202204A1 (en) * | 1992-01-28 | 1993-07-29 | Andreas Kipping | Air conditioning plant esp. for sealed partitioned container holding electronic data processor - contg. high value heat giving appts. to be protected in certain cases and plant is designed with two self sufficient plant parts working together each with HP & LP part |
US6067482A (en) * | 1999-01-08 | 2000-05-23 | Hussmann Corporation | Load shifting control system for commercial refrigeration |
US6718779B1 (en) * | 2001-12-11 | 2004-04-13 | William R. Henry | Method to optimize chiller plant operation |
EP2085842A1 (en) * | 2008-01-28 | 2009-08-05 | LG Electronics Inc. | Equipment controlling system and controlling method thereof |
US20090206668A1 (en) * | 2008-02-15 | 2009-08-20 | Warwick Graham Andrew Dawes | Uninterruptible cooling system and apparatus |
-
2010
- 2010-09-20 IT ITBO2010A000564A patent/IT1402316B1/en active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4202204A1 (en) * | 1992-01-28 | 1993-07-29 | Andreas Kipping | Air conditioning plant esp. for sealed partitioned container holding electronic data processor - contg. high value heat giving appts. to be protected in certain cases and plant is designed with two self sufficient plant parts working together each with HP & LP part |
US6067482A (en) * | 1999-01-08 | 2000-05-23 | Hussmann Corporation | Load shifting control system for commercial refrigeration |
US6718779B1 (en) * | 2001-12-11 | 2004-04-13 | William R. Henry | Method to optimize chiller plant operation |
EP2085842A1 (en) * | 2008-01-28 | 2009-08-05 | LG Electronics Inc. | Equipment controlling system and controlling method thereof |
US20090206668A1 (en) * | 2008-02-15 | 2009-08-20 | Warwick Graham Andrew Dawes | Uninterruptible cooling system and apparatus |
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Publication number | Publication date |
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IT1402316B1 (en) | 2013-08-30 |
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