EP2000758B1 - Dispositif de commande d'une machine réfrigérante - Google Patents

Dispositif de commande d'une machine réfrigérante Download PDF

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Publication number
EP2000758B1
EP2000758B1 EP20070425351 EP07425351A EP2000758B1 EP 2000758 B1 EP2000758 B1 EP 2000758B1 EP 20070425351 EP20070425351 EP 20070425351 EP 07425351 A EP07425351 A EP 07425351A EP 2000758 B1 EP2000758 B1 EP 2000758B1
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EP
European Patent Office
Prior art keywords
signal
refrigerating machine
sdlv
service fluid
control device
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.)
Not-in-force
Application number
EP20070425351
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German (de)
English (en)
Other versions
EP2000758A1 (fr
Inventor
Alessandro Zen
Luca Cecchinato
Alessandro Beghi
Cristian Bodo
Alessandro Scodellaro
Michele Albieri
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Rhoss SpA
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Rhoss SpA
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Publication date
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Priority to EP20070425351 priority Critical patent/EP2000758B1/fr
Priority to ES07425351T priority patent/ES2362133T3/es
Priority to DE200760012060 priority patent/DE602007012060D1/de
Publication of EP2000758A1 publication Critical patent/EP2000758A1/fr
Application granted granted Critical
Publication of EP2000758B1 publication Critical patent/EP2000758B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B49/022—Compressor control arrangements
    • 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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B2600/00—Control issues
    • F25B2600/23—Time delays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet

Definitions

  • the present invention concerns a control device for a refrigerating machine according to claim 1.
  • the present invention finds useful, but not exclusive, application in the regulation of the delivery temperature of a service fluid in output from a water chiller for centralized air-conditioning systems, to which the following description shall make explicit reference without, however, any loss of generality.
  • a centralized air-conditioning system for the control of the ambient temperature in a building comprises a plurality of fan coils, opportunely distributed inside the building and connected with each other via a hydraulic circuit, and a centralized refrigerating machine suited to cool a service fluid, in particular a coolant liquid substantially composed of water, and to convey this service fluid to the various fan coils via said hydraulic circuit.
  • This refrigerating machine normally indicated by the term "chiller”, comprises an internal circuit in which a working fluid consisting of a refrigerant circulates, an output circuit that connects to the hydraulic circuit of the air-conditioning system in correspondence to the unit's inlet and outlet to form, together with said hydraulic circuit, a so-called hydronic circuit, a heat exchanger through which the internal circuit and the output circuit pass for heat exchange between the working fluid and the service fluid, and one or more compressors for implementing a refrigeration cycle on the working fluid through compression of the working fluid itself.
  • Electronic control devices are also known of for controlling the switching on and off of the compressors on the basis of a direct comparison between a measurement of the temperature of the service fluid in output from the refrigerating machine, or rather the delivery temperature of the service fluid, and a pair of temperature thresholds such that the delivery temperature converges to a predetermined set point value.
  • the U.S. patent application published with number US 2005/0235669 A1 discloses a control device according to the preamble of claim 1 for controlling the on/off switching of the compressor as a function of the comparison between the sensed temperature of an evaporating pipe and a pair of threshold temperatures.
  • the refrigerating machine is typically equipped with a storage tank applied on the delivery branch of the hydronic circuit at a short distance from the heat exchanger to produce thermal inertia in the hydronic circuit that slows down the dynamics of the air-conditioning system in terms of speed of temperature variation in the service fluid so as to avoid phenomena that could induce instability in the system, such as undesired oscillations phenomena in the regulator valves of the fan coils for example.
  • the delivery temperature on the basis of which the switching on and off of the compressors is controlled, is typically taken downstream of the storage tank.
  • the storage tank is usually housed inside the metal casing that encloses the various mechanical components of the refrigerating machine, and so the size and cost of the refrigerating machine heavily depend on its presence. Therefore, for reasons of cost and overall dimensions, it is often attempted to reduce or even eliminate the storage tank, consequently making a refrigerating machine potentially capable of inducing the above-mentioned drawbacks.
  • the object of the present invention is to create a control device for a refrigerating machine and a refrigerating machine that allows the drawbacks caused by the absence of the storage tank to be overcome and that, at the same time, are simple and economic to manufacture.
  • a control device for a refrigerating machine and a refrigerating machine in accordance with the attached claims are provided.
  • reference numeral 1 generally designates a block diagram showing the principles of an air-conditioning system comprising a plurality of fan coils 2 opportunely distributed inside a building (not shown) for which it is wished to control the ambient temperature, and a refrigerating machine 3 suited to cool a service fluid 5, in particular a coolant liquid substantially composed of water, and make it circulate through a hydraulic circuit 4 that connects the fan coils 2 to the refrigerating machine 3 itself.
  • the refrigerating machine 3 comprises an internal circuit 6, in which a working fluid 7 consisting of a refrigerant circulates, and an output circuit 8, which connects to the hydraulic circuit 4 of the system 1 in correspondence to an inlet 9 and an outlet 10 of the refrigerating machine 3.
  • a series of devices are arranged along the internal circuit 6 to implement a refrigeration cycle on the working fluid 7, and in particular, a first heat exchanger 11 through which the internal circuit 6 and the output circuit 8 pass and which functions as an evaporator to make the working fluid 7 evaporate at low pressure, absorbing heat from the service fluid 5; a compressor 12, preferably of the scroll type, to carry out adiabatic compression on the working fluid 7 in the vapour state; a second heat exchanger 13 functioning as a condenser, that is to make the working fluid 7 condense so as to release the previously absorbed heat to the outside, and an expansion valve 14 to cool the working fluid 7 and make it partially evaporate so that it is ready for another cycle.
  • the hydraulic circuit 4 of the system 1 and the output circuit 8 of the refrigerating machine 3 form a so-called hydronic circuit 15, comprising a delivery branch 16, along which the service fluid 5 circulates in a direction D from the heat exchanger 11 to the fan coils 2, and a return branch 17, along which the service fluid 5 returns to the heat exchanger 11. Circulation of the service fluid 5 in direction D is guaranteed by a pump 18 placed along the return branch 17.
  • the refrigerating machine 3 comprises a control device 19 to control the switching on and off of the compressor 12 based on the delivery temperature TLDV of the service fluid 5.
  • the control device 19 comprises a temperature sensor 20 placed along the delivery branch 16 at the outlet 10 of the refrigerating machine 3 to provide a first signal SDLV representing the delivery temperature TDLV and an electronic control unit 21 suited to switch the compressor 12 on and off on the basis of a comparison between a measurement of the delivery temperature TDLV, provided via the SDLV signal, and a pair of temperature thresholds such that the delivery temperature TDLV converges to a delivery temperature set point between the two temperature thresholds.
  • the control device 19 comprises a filter 22 connected in input with the sensor 20 to receive the signal SDLV and in output with the electronic control unit 21 to supply a corresponding signal SCTRL obtained by damping the dynamics of the SDLV signal according to a model that reconstructs the dynamic behaviour of a common storage tank.
  • the SCTRL signal represents a delivery temperature with dampened dynamics, in the time domain, on the basis of which control of the compressor 12 is performed. In other words, a delivery temperature measurement is extracted from the SCTRL signal and compared with the above-mentioned temperature thresholds to switch the compressor 12 on or off.
  • stratification which consists in a division of the service fluid into layers according to the temperature
  • mixing which consists in the fact that part of the incoming service fluid is typically colder than that inside and absorbs part of the heat of the latter, converging to a temperature that can be defined as one of equilibrium.
  • the delay T represents the delay due to the stratification and parameter P is proportional to a mixing coefficient, which defines the volume percentage of the service fluid 5 in the tank that is affected by the mixing phenomena, at the density of the service fluid 5 in the hydronic circuit 15 expressed in kg/m 3 ad at a storage volume expressed in m 3 that it is wished to simulate, and is inversely proportional to the mass flow of the service fluid expressed in kg/s.
  • Figure 2 shows a table in which a series of values are listed that the parameters T and P must assume in order to simulate a corresponding series of tank volume values expressed in L/kW, i.e. expressed in litres with reference to the nominal power of the compressor 12. These values have been determined through experimental tests, applying a method known as the area method, which allows a system to be identified via its response to an input signal, such as a unitary step for example.
  • the best compromise between damping the dynamics of the system 1 and the regulating speed of the delivery temperature TDLV is obtained by sizing the filter 22 for intermediate tank volumes, between 4 and 6 L/kW for example, and preferably for a tank volume value equal to 5 L/kW, to which there is a corresponding delay T substantially equal to 32.6 s and a parameter P substantially equal to 70.8 s.
  • the diagram of the principle of the refrigerating machine 3 shown in Figure 1 can also generically describe a machine suited to heat the service fluid 5 for the purpose of heating the environments in which the fan coils 2 are placed, for example a refrigerating machine 3 of the type operating as a heat pump.
  • the compressor 12 is configured so as to perform the refrigeration cycle in the opposite sense to that previously described, such that the heat exchanger 11 functions as a condenser to transfer heat from the working fluid 7 to the service fluid 5 and the heat exchanger 13 functions as an evaporator.
  • the sizing of the filter 22 is virtually independent of the fact of cooling or heating the service fluid 5.
  • the control device 19 provided with the filter 22 is also applicable to a refrigerating machine suited to heat the service fluid 5.
  • control device 19 for a refrigerating machine 3 is to allow the elimination of the storage tank on the delivery branch 16 of the hydronic circuit 15, whilst still guaranteeing the necessary stability of the air-conditioning system 1 thanks to the presence of the filter 22, which defines a virtual storage tank.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)
  • Control Of Temperature (AREA)

Claims (5)

  1. Dispositif de commande pour une machine de réfrigération (3) comprenant un compresseur (12), le dispositif de commande (19) comprenant des moyens de détection de température (20) pour fournir un premier signal (SDLV) représentant la température de distribution (TDLV) d'un fluide de service (5) en sortie de la machine de réfrigération (3), une unité de commande (21) appropriée pour mettre en marche et arrêter le compresseur (12) conformément au premier signal (SDLV), et des moyens d'amortissement de signal (22) pour recevoir le premier signal (SDLV) et pour délivrer un deuxième signal amorti (SCTRL) correspondant obtenu en amortissant la dynamique du premier signal (SDLV) et approprié pour être délivré en entrée à l'unité de commande (21) pour commander ladite mise en marche et ledit arrêt du compresseur (12) ; caractérisé en ce que lesdits moyens d'amortissement comprennent un filtre du premier ordre (22) avec un retard pour simuler une accumulation dudit fluide de service (5).
  2. Dispositif selon la revendication 1, dans lequel ledit filtre (22) a une fonction de transfert de domaine de transformation de Laplace donnée par : F s = e - sT 1 + s ⋅ Pʹ
    Figure imgb0004
    où T définit un retard entre ledit premier signal (SDLV) en entrée du filtre et ledit deuxième signal (SCTRL) en sortie du filtre (22) et P est un paramètre d'accumulation proportionnel à un volume de stockage de fluide de service (5) qu'on souhaite simuler et à un coefficient de mélange du fluide de service (5) dans ledit volume de stockage.
  3. Dispositif selon la revendication 2, dans lequel ledit filtre (22) est dimensionné pour une valeur dudit volume de stockage à simuler dans la plage de 4 à 6 L/kW.
  4. Dispositif selon la revendication 2 ou 3, dans lequel ledit retard (T) entre ledit premier signal (SDLV) et ledit deuxième signal (SCTRL) est égal à 32,6 s et ledit paramètre d'accumulation (P) est égal à 70,8 s.
  5. Machine de réfrigération (3) comprenant un compresseur (12) et un dispositif de commande (19) pour mettre en marche et arrêter le compresseur (12) conformément à une mesure de la température de distribution (TDLV) d'un fluide de service (5) en sortie de la machine de réfrigération (3), et caractérisée en ce que le dispositif de commande (19) est du type revendiqué dans l'une des revendications 1 à 4.
EP20070425351 2007-06-04 2007-06-04 Dispositif de commande d'une machine réfrigérante Not-in-force EP2000758B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20070425351 EP2000758B1 (fr) 2007-06-04 2007-06-04 Dispositif de commande d'une machine réfrigérante
ES07425351T ES2362133T3 (es) 2007-06-04 2007-06-04 Dispositivo de control para una máquina de refrigeración.
DE200760012060 DE602007012060D1 (de) 2007-06-04 2007-06-04 Steuervorrichtung für ein Kühlgerät

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070425351 EP2000758B1 (fr) 2007-06-04 2007-06-04 Dispositif de commande d'une machine réfrigérante

Publications (2)

Publication Number Publication Date
EP2000758A1 EP2000758A1 (fr) 2008-12-10
EP2000758B1 true EP2000758B1 (fr) 2011-01-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070425351 Not-in-force EP2000758B1 (fr) 2007-06-04 2007-06-04 Dispositif de commande d'une machine réfrigérante

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EP (1) EP2000758B1 (fr)
DE (1) DE602007012060D1 (fr)
ES (1) ES2362133T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HK1137899A2 (zh) * 2009-06-05 2010-08-06 Ace Action Limited 节能装置、空调或制冷系统及空调或制冷系统的控制方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292813A (en) * 1979-03-08 1981-10-06 Whirlpool Corporation Adaptive temperature control system
JP2696398B2 (ja) * 1989-06-22 1998-01-14 株式会社ゼクセル 車両用空調装置のコンプレッサ制御装置
KR100573770B1 (ko) 2004-04-24 2006-04-25 삼성전자주식회사 냉장고 및 그 제어방법
BRPI0403128A (pt) * 2004-08-02 2006-03-14 Multibras Eletrodomesticos Sa sistema para ajustar a temperatura em um aparelho de refrigeração

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DE602007012060D1 (de) 2011-03-03
ES2362133T3 (es) 2011-06-28
EP2000758A1 (fr) 2008-12-10

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