Field of the Invention
[0001] The present invention relates to the field of temperature control systems, and in particular, to a control algorithm for use in automatically controlling an air-conditioning system by sensing multiple conditions and responding by actuating the mechanical components of the air-conditioning system.
Background of the Invention
[0002] Many air conditioning zone control systems include a single sensor that monitors the temperature of the ambient air or the temperature of the air returning from the zone whose temperature is being controlled. This sensor provides feedback to an air-conditioning system controller in order for the controller to adjust various air-conditioning components such as supply air fans, coil coolant fluid proportional valves (cooling or heating mode), and electric heaters, if any, to attempt to maintain a temperature setpoint in the zone.
[0003] A controller using a control algorithm that only references a zone's ambient or return air temperature against a user entered setpoint can yield large temperature fluctuations in the zone because, for example, the supply air is of a much lower temperature than the zone's temperature. When this supply air is delivered to the zone, it causes a large temperature drop below the setpoint and the controller must affect an immediate adjustment in the opposite direction to provide warmer air to the zone.
[0004] This cycling is undesirable because it causes the controller to frequently adjust the system components in an effort to achieve the setpoint in the zone, and as a result, it merely increases equipment wear and causes periodic temperature fluctuations above and below the setpoint in the zone.
[0005] Certain algorithms exist to minimize the aforementioned cycling using only the ambient temperature in the zone or the return air sensor, but without additional sensors, they are not capable of providing for optimization of the temperature fluctuations in the coolant fluid, detecting air-conditioning system mechanical component failures, providing supply end equipment overheating alerts to a system user or building management system, or providing smart temperature controls for an air conditioned zone.
US 4487028 discloses a method of the type defined in the preamble of claim 1.
Summary of the Invention
[0006] The invention provides a method as claimed in claim 1, and a control system as defined in claim 6.
Brief Description of the Drawings
[0007] For a further understanding of these and other objects of the invention, reference will be made to the following detailed description of the invention which is to be read in connection with the accompanying drawing, where:
FIG. 1 diagrammatically depicts a zone air-conditioning system and its component parts;
FIG. 2 displays numerous inputs and outputs connected to the air-conditioning system zone controller to be used by the new algorithm;
FIG. 3 schematically depicts the prior art control of a proportional coolant fluid flow valve of an air-conditioning system using only a return air sensor and a zone setpoint;
FIG. 4 schematically depicts a coolant fluid delta temperature controlling embodiment of the new control algorithm;
FIG. 5 shows, in the form of curves, the values of the setpoint and the delta temperature of the coolant fluid with and without the new algorithm active in the controller.
FIG. 6 schematically depicts a supply side equipment overheating and warning system embodiment of the new control algorithm.
Detailed Description
[0008] Referring initially to FIG.1, there is illustrated a diagrammatical depiction of a zone air-conditioning system generally referenced at
10, that illustrates a direction of air flow coming into the system
12, from the air-conditioned zone
14 and a direction of conditioned air flow exiting the system
13. Entrance of the air flow from the zone
14, passes over a return air temperature sensor
16, then through a supply side filter
18, then through at least one supply side air fan
20, a supply side air temperature adjusting coil
32, and finally over a supply air temperature sensor
24. The conditioned air is then supplied to the zone
14. A supply side proportional coolant fluid flow valve
34, is disposed in the piping that the supplies the supply coolant fluid
35, to the supply side of the air temperature adjusting coil
32. The temperature of the supply coolant fluid
35, is sensed by a supply coolant fluid temperature sensor
36, if present, or broadcast by a building monitoring system. The temperature of the return coolant fluid
38 from the air temperature adjusting coil
32, is monitored by a return coolant fluid temperature sensor
37.
[0009] Turning now to FIG. 2, some inputs and outputs to air-conditioning system controller
51, are shown that are used by the control algorithm
50, running therein. The controller
51, contains a microprocessor having a clock speed of at least 16 MHz, internal RAM memory of at least 3.84 Kbytes, internal FLASH memory of at least 128 Kbytes, internal E
2 memory of at least 1 Kbyte, a built in A/D converter of at least 10 bits with a 1 LSB error, and a watchdog that is on the chip hardware.
[0010] In one embodiment, the control algorithm
50, primarily controls the temperature of the zone
14, and secondarily strives to optimize the delta temperature of the coolant fluids
35, 38, of the air-conditioning system
10, to a temperature of about 5-6 degrees Fahrenheit (2,8 - 3,3 degrees Celcius). Delta temperature is defined as the difference between the supply coolant fluid
35, temperature as sensed by the supply coolant fluid temperature sensor
35, if present, or as a value broadcast to the controller
51, by a building management system
54, and the return coolant fluid
38, temperature as sensed by a return coolant fluid temperature sensor
37.
[0011] Referring now to FIG. 3, a schematic depiction of the prior art relating to proportional coolant fluid flow valve
34, is shown wherein the proportional position reference
134, is determined solely by the zone
14, ambient air temperature or the return air temperature sensor
16. As mentioned above, this system has many undesirable effects relating to zone temperature fluctuations and equipment wear. It should be noted that this prior art is included as a portion of the present invention's proportional coolant fluid flow valve's
34, control algorithm
50.
[0012] Referring now to FIG. 4, an embodiment of the proportional coolant fluid flow valve
34, system control algorithm
50, is shown. The upper half of the schematic depicts a standard control loop wherein the user entered zone setpoint
9, input by a thermostatic device or programmed by a system user, and the return air temperature sensor
16, input values are combined in symbolic sigma block
102, to provide zone setpoint error point signal
104, which is conditioned through an adjustable fan gain block
106, and an adjustable fan PI block
108, to yield a fan speed reference signal
19, to at least one variable speed fan
20. A symbolic sigma block is defined as a graphical depiction of a mathematical summation of the values entering into it with the resulting value exiting it. Zone setpoint error point signal
104, is also conditioned through an adjustable proportional coolant fluid flow valve gain block
110, and an adjustable proportional coolant fluid flow valve PI Block
112, to yield a proportional coolant fluid flow valve positioning reference signal
111, that is input to symbolic sigma block
114, whose output is the position reference signal
134, to proportional coolant fluid flow valve
34. It should be noted that FIG.4 depicts the coolant fluid to be water, however, those skilled in the art will appreciate that other refrigerants well known in the art could be used.
[0013] Without the new algorithm, the bottom portion of the schematic, a zero value would come into symbolic sigma block
114, and yield the prior art calculation for positioning the proportional coolant fluid flow valve
34, and would suffer from the frequent adjustment of its position and the temperature of the supply coolant fluid
35, used to supply the air temperature adjusting coil
32. As noted above, this type of control scheme using only the zone air temperature setpoint
9, and the return air temperature sensor
16, input is undesirable because it only results in temperature fluctuations above and below the user entered zone air temperature setpoint
9, and increased supply side equipment wear.
[0014] To minimize this fluctuation, the new algorithm (the bottom portion of the schematic in FIG. 4) provides a dampening (transient response minimizing) proportional feedback loop that is implemented using the actual difference of the supply coolant fluid
35, and return coolant fluid
38, temperatures compared against a user selectable coolant fluid delta temperature setpoint parameter
120, which is optimally about 5-6 degrees Fahrenheit (2,8 - 3,3 degrees Celcius). The new proportional loop supplies the control algorithm
50, with the temperature of the supply coolant fluid
35, via the supply coolant fluid temperature sensor
36, or a value broadcast from a building management system, and the temperature of the return coolant fluid
38, via the return coolant fluid temperature sensor
37. The supply coolant
35, temperature is combined with the return coolant temperature
37, in symbolic sigma block
116, and yields a coolant fluid delta temperature signal
118, as the system
10, is operation.
[0015] This proportional coolant feedback delta temperature signal
118, is combined with the user entered coolant fluid delta temperature setpoint
120, in symbolic sigma block
122, which yields a coolant fluid delta temperature error
124. A unit delay block
126, and an adjustable gain block
128, condition the coolant fluid delta temperature error
124, which is combined in multiplication block
132, with a delta coolant temperature controller output
130, to create a coolant proportional control loop output signal
100. This coolant proportional control loop output signal 100, is negated and then combined with the return air controlled proportional valve position reference
111, in symbolic sigma block
114, to yield the proportional position reference
134, to the proportional coolant fluid flow valve
34.
[0016] The effect of utilizing this control algorithm
50, with the coolant fluids
35, 38, temperature feedback is to dampen the amplitude of the coolant fluids
35,38, temperature fluctuations to a point that they are not as greatly affected by variations of the return air
12, to the air-conditioning system
10, and can strive to achieve the optimum temperature of about 5-6 degrees Fahrenheit.
[0017] Referring now to FIG. 5, the aforementioned dampening of the coolant fluid temperature response to fluctuating readings from the return air sensor
16, and the effect of using the new control algorithm
50, are demonstrated in the form of response curves from a system running the exact same simulation. One simulation had the control algorithm
50, activated and the other did not.
[0018] The more active temperature signal trace depicts the erratic behavior of the coolant delta temperature signal
118, with the new control algorithm deactivated and the coolant temperature being controlled only by the return air temperature sensor
16, input compared to the user entered zone setpoint
9.
[0019] The more stable temperature signal trace depicts a more controlled behavior of the delta temperature signal
118, with the new control algorithm
50, activated using the return air temperature sensor
16, input, the supply air temperature sensor
24, input, the coolant fluid supply sensor
36, input, the coolant fluid return sensor
37, input, and the proportional coolant fluid flow valve
34, positioning reference output signal
111, in operation. As can be seen, the delta temperature response of the coolant fluids
35, 38, in relationship to the user entered coolant fluid delta temperature setpoint
120, in this case, 6 degrees Fahrenheit, is much closer because of the dampened response of the position reference signal
134, to proportional coolant fluid flow valve
34.
[0020] Turning now to Fig. 6, in another embodiment, the air-conditioning system controller
51, can selectively provide information that a system component in the system has failed. Using inputs from the supply air temperature sensor
24, and the return air temperature sensor
16, and combining these values through symbolic sigma block
200, yields an air delta temperature signal
202, value that is combined with a user programmed system component failed parameter
19, to yield a system component status signal
208, that the control algorithm
50, can use to determine that the system is functioning abnormally and that there has been a component failure or significant decrease in a component's functionality. Upon this detection, the control algorithm
50, can send a component failure signal
40, to alert a system user
52, via a visual device or a building management system
54, to inform a proper individual of the probable malfunction.
[0021] In another embodiment, the control algorithm
50, selectively provides for a safety warning of a hazardous equipment failure. For example, if the supply air temperature sensor
24, detects a temperature input exceeding a programmable high supply air temperature limit parameter
301, the control algorithm
50, can send a hazardous condition signal
302, to alert a system user
52 by a visual device, or a building management system
54, to inform a proper individual of the probable malfunction, and automatically shut down the air-conditioning system
10.
[0022] In still another embodiment, the control algorithm
50, selectively enables smart temperature control of the air-conditioned zone
14. For example, using the supply air temperature sensor
24, input and the control algorithm
50, the "cold shower effect" in the heating mode can be avoided if a "no cold air inrush in heating mode" parameter
500, is programmed by the system user
52, to do so. The "cold shower effect" is realized when at least one of the supply air fans
20, is turned on at a high speed and pushes air that has been cooled
17, by remaining in the ductwork
21, between the air-conditioned zone
14, and the supply equipment. When this cooled air
17, is forced into the zone
14, at a high speed before any air-conditioned air is mixed with it, the result is air delivery that is cool at first and then warms up after the ductwork is purged of the cooled air
17.
[0023] The control algorithm
50, is adapted to reduce the variable speed fan reference signal
19, of at least one of the supply air fans
20, raise the temperature of the supply air flow through the use of the supply side air temperature adjusting coil
32, to slowly mix the cooler air already in the ductwork
21, with the higher temperature air flow exiting the system
13, and then deliver air to the zone
14, that is initially much closer to user entered air temperature setpoint
9.
[0024] Yet another example of smart temperature control using the supply air temperature sensor
24, input and the control algorithm
50, is to avoid potential condensation risks of supply side components in the cooling mode. If an "optimize supply side temperature in cooling mode"
7, parameter is programmed by the user to do so, the control algorithm
50, will use the detected supply air temperature sensor
24, input and raise the temperature of the supply side coolant fluid
35, to heat the supply side equipment as much as possible to avoid condensation risks without affecting the overall air-conditioning purpose of the system
10.
[0025] While the present invention has been particularly shown and described with reference to the preferred mode as illustrated in the drawing, it will be understood by one skilled in the art that various changes in detail may be effected therein without departing from the scope of the invention as defined by the claims.
1. A method of controlling an air-conditioning system (10) of the type having a system operator (51), a building management system (54), a heat exchanger coil (32) with a coolant fluid flowing therethrough, and a flow of air being circulated therethrough, comprising the steps of:
obtaining a coolant fluid supply temperature of a supply coolant fluid (35) entering said coil;
obtaining a coolant fluid return temperature of a return coolant fluid (38) exiting said coil;
comparing said coolant fluid supply temperature with said coolant fluid return temperature to obtain a coolant fluid delta temperature;
establishing a coolant fluid delta temperature setpoint (120);
comparing said coolant fluid delta temperature with said coolant fluid delta temperature setpoint to obtain a coolant fluid delta temperature error;
providing at least one valve (34) for controlling the flow of coolant fluid through said coil;
actuating said valve in response to said coolant fluid delta temperature error;
characterised by determining a supply air temperature;
determining a return air temperature;
comparing said supply air temperature with said return air temperature to obtain an air temperature error point;
establishing a component failure setpoint;
comparing said air temperature error point with said component failure setpoint; and
responsively alerting at least one of a system user and a building management system of a component failure.
2. The method of Claim 1 to control an air-conditioning system comprising the further steps of:
obtaining an air-conditioned zone air temperature;
obtaining an air-conditioned zone temperature setpoint (9);
comparing said zone air temperature with said zone temperature setpoint to obtain a zone setpoint error value; and
actuating said valve in response to said zone setpoint error value.
3. The method of Claim 1 to control an air-conditioning system comprising the further steps of:
determining if the system is in a cooling mode;
establishing a low supply side component temperature limit;
comparing said supply air temperature with said low supply side component temperature limit; and
responsively raising the supply side coolant fluid temperature.
4. The method of Claim 1 to control an air-conditioning system comprising the further steps of:
determining if the system is in a heating mode;
establishing an upper cold shower limit setpoint;
comparing said air temperature error point with said upper cold shower limit setpoint;
responsively raising the supply side coolant fluid temperature command; and
responsively reducing the speed of at least one of a supply air fan (20).
5. The method of Claim 1 to control an air-conditioning system comprising the further steps of:
obtaining said air temperature error point;
establishing a supply component overheating setpoint;
comparing said air temperature error point with said component overheating setpoint; and
responsively shutting down said air-conditioning system.
6. A control system apparatus for an air-conditioning system of the type having a zone controller, a heat exchanger coil (32) with a coolant fluid flowing therethrough controlled by a coolant fluid control valve (34), and a flow of air being circulated therethrough, comprising:
a coolant fluid supply temperature sensor (36) for sending a representative signal to the zone controller;
a coolant fluid return temperature sensor (37) for sending a representative signal to the zone controller;
wherein the zone controller is capable of developing a coolant fluid delta temperature in response to said representative coolant fluid supply temperature and said coolant fluid return temperature representative signals and comparing said coolant fluid delta temperature against a delta temperature setpoint to generate a coolant fluid delta temperature error signal (118);
a valve actuator that operates in response to said coolant fluid delta temperature error signal to actuate said coolant fluid flow control valve;
characterised by a supply air temperature sensor (24) for sending a representative signal to the zone controller;
a return air sensor (16) that is capable of sending a representative signal to said zone controller;
wherein said zone controller is capable of developing an air delta temperature signal (202) in response to said zone air temperature representative signal and said return air temperature representative signal and comparing said air delta temperature signal with a system component failure parameter to generate a system component status signal (208); and
responsively communicates said system component failure to a system operator.
7. The control system apparatus of Claim 6 and further including:
a zone air temperature sensor for sending a representative signal to the zone controller;
and a zone temperature user interface setpoint setting device capable of communicating a zone temperature setpoint to said zone controller;
wherein the zone controller is capable of developing a zone setpoint error point signal in response to said zone air temperature signal and said zone temperature setpoint; and
wherein said valve actuator operates in further response to said setpoint error point signal to actuate said fluid flow control valve.
8. The control system apparatus of Claim 7 wherein:
said zone air temperature sensor is a thermostatic device located within the zone that is capable of sending a representative signal to said zone controller.
9. The controls system apparatus of Claim 7 wherein:
said zone user interface is a thermostatic device operated manually by a system user that is capable of sending a representative signal to the zone controller.
10. The control system apparatus of Claim 7 wherein:
said zone user interface is a building management system (54) that is capable of sending a representative signal to said zone controller.
11. The control system apparatus of Claim 6 wherein:
said supply air temperature representative signal is compared with a hazardous equipment failure signal to generate a hazardous equipment condition status signal (302); and
responsively communicates said hazardous status to the system operator.
12. The control system apparatus of Claim 6 wherein:
said zone controller is a microprocessor based device capable of receiving said representative signals from said sensors and providing operating signals to said valve actuators, cooling fans, component failure devices, and hazardous equipment status alert devices.
1. Verfahren zum Regeln einer Klimaanlage (10) der Art, die einen Anlagenbetreiber (51), ein Gebäudeleitsystem (54), eine Wärmetauscherspirale (32) mit einem dort hindurchströmenden Kühlfluid sowie einen im Kreislauf dort hindurchgeführten Luftstrom aufweist, umfassend die Schritte:
Erhalten einer Kühlfluidvorlauftemperatur eines Vorlaufkühlfluids (35), das in die Spirale strömt;
Erhalten einer Kühlfluidrücklauftemperatur eines Rücklaufkühlfluids (38), das aus der Spirale strömt;
Vergleichen der Kühlfluidvorlauftemperatur mit der Kühlfluidrücklauftemperatur zum Erhalten eines Kühlfluid-Temperaturunterschieds;
Ermitteln eines Sollwerts für den Kühlfluid-Temperaturunterschied (120);
Vergleichen des Kühlfluid-Temperaturunterschieds mit dem Sollwert für den Kühlfluid-Temperaturunterschied zum Erhalten eines Kühlfluid-Temperaturunterschiedfehlers;
Bereitstellen von mindestens einem Ventil (34) zum Steuern des Kühlfluidstroms durch die Spirale;
Betätigen des Ventils als Reaktion auf den Kühlfluid-Temperaturunterschiedfehler;
gekennzeichnet durch Bestimmen einer Zulufttemperatur;
Bestimmen einer Rücklufttemperatur;
Vergleichen der Zulufttemperatur mit der Rücklufttemperatur zum Erhalten eines Lufttemperatur-Fehlerpunkts;
Ermitteln eines Sollwerts für einen Bauteilausfall;
Vergleichen des Lufttemperatur-Fehlerpunkts mit dem Sollwert für einen Bauteilausfall; und
darauf reagierend Alarmieren eines Anlagennutzers und/oder eines Gebäudeleitsystems wegen eines Bauteilausfalls.
2. Verfahren nach Anspruch 1 zum Regeln einer Klimaanlage, umfassend die weiteren Schritte:
Erhalten einer Lufttemperatur des klimatisierten Bereichs;
Erhalten eines Sollwerts für die Temperatur des klimatisierten Bereichs (9);
Vergleichen der Bereichslufttemperatur mit dem Sollwert für die Bereichstemperatur zum Erhalten eines Bereichssollwert-Fehlerwerts; und
Betätigen des Ventils als Reaktion auf den Bereichssollwert-Fehlerwert.
3. Verfahren nach Anspruch 1 zum Regeln einer Klimaanlage, umfassend die weiteren Schritte:
Feststellen, ob sich die Anlage in einem Kühlmodus befindet;
Ermitteln eines unteren Temperaturgrenzwerts für ein zuluftseitiges Bauteil;
Vergleichen der Zulufttemperatur mit dem unteren Temperaturgrenzwert für ein zuluftseitiges Bauteil; und
darauf reagierend Erhöhen der vorlaufseitigen Kühlfluidtemperatur.
4. Verfahren nach Anspruch 1 zum Regeln einer Klimaanlage, umfassend die weiteren Schritte:
Feststellen, ob sich die Anlage in einem Heizmodus befindet;
Ermitteln eines Sollwerts für einen oberen Kaltdusche-Grenzwert;
Vergleichen des Lufttemperatur-Fehlerpunkts mit dem Sollwert für einen oberen Kaltdusche-Grenzwert;
darauf reagierend Befehl zum Erhöhen der vorlaufseitigen Kühlfluidtemperatur; und
darauf reagierend Verlangsamen der Drehzahl von mindestens einem Zuluftgebläse (20).
5. Verfahren nach Anspruch 1 zum Regeln einer Klimaanlage, umfassend die weiteren Schritte:
Erhalten des Lufttemperatur-Fehlerpunkts;
Ermitteln eines Sollwerts für die Überhitzung eines Zuluftbauteils;
Vergleichen des Lufttemperatur-Fehlerpunkts mit dem Sollwert für die Bauteilüberhitzung; und
darauf reagierend Abschalten der Klimaanlage.
6. Regelungssystemvorrichtung für eine Klimaanlage der Art, die eine Bereichssteuerung, eine Wärmetauscherspirale (32) mit einem dort hindurchströmenden Kühlfluid, das mit einem Kühlfluid-Steuerventil (34) gesteuert wird, sowie einen im Kreislauf dort hindurchgeführten Luftstrom aufweist, umfassend:
einen Kühlfluidvorlauftemperatursensor (36) zum Senden eines entsprechenden Signals an die Bereichssteuerung;
einen Kühlfluidrücklauftemperatursensor (37) zum Senden eines entsprechenden Signals an die Bereichssteuerung;
wobei die Bereichssteuerung in der Lage ist, als Reaktion auf das entsprechende Kühlfluidvorlauftemperatur- und das entsprechende Kühlfluidrücklauftemperatursignal einen Kühlfluidtemperaturunterschied zu bilden und den Kühlfluidtemperaturunterschied mit einem Sollwert für den Temperaturunterschied zu vergleichen und so ein Fehlersignal für den Kühlfluid-Temperaturunterschied (118) zu erzeugen;
einen Ventilantrieb, der als Reaktion auf das Kühlfluid-Temperaturunterschiedfehlersignal so arbeitet, dass er das Kühlfluidstrom-Steuerventil betätigt;
gekennzeichnet durch einen Zulufttemperatursensor (24) zum Senden eines entsprechenden Signals an die Bereichssteuerung;
einen Rückluftsensor (16), der in der Lage ist, ein entsprechendes Signal an die Bereichssteuerung zu senden;
wobei die Bereichssteuerung in der Lage ist, als Reaktion auf das der Bereichslufttemperatur entsprechende Signal und das der Rücklufttemperatur entsprechenden Signal ein Lufttemperaturunterschiedsignal (202) zu erzeugen und das Lufttemperaturunterschiedsignal mit einem Anlagenbauteilausfallparameter zu vergleichen und so ein Anlagenbauteilzustandssignal (208) zu erzeugen; und
darauf reagierend Übermitteln des Anlagenbauteilausfalls an einen Anlagenbetreiber.
7. Regelungssystemvorrichtung nach Anspruch 6 und ferner aufweisend:
einen Bereichslufttemperatursensor zum Senden eines entsprechenden Signals an die Bereichssteuerung;
sowie eine Bereichstemperatur-Benutzerschnittstellen-Sollwertvorgabeeinri chtung, die in der Lage ist, einen Bereichstemperatursollwert an die Bereichssteuerung zu übermitteln;
wobei die Bereichssteuerung in der Lage ist, als Reaktion auf das Bereichslufttemperatursignal und den Bereichstemperatursollwert ein Bereichssollwert-Fehlerpunktsignal zu bilden; und
wobei der Ventilantrieb ferner als Reaktion auf das Sollwert-Fehlerpunktsignal so arbeitet, dass er das Fluidstrom-Steuerventil betätigt.
8. Regelungssystemvorrichtung nach Anspruch 7, wobei:
der Bereichslufttemperatursensor eine sich innerhalb des Bereichs befindliche Thermostateinrichtung ist, die in der Lage ist, ein entsprechendes Signal an die Bereichssteuerung zu senden.
9. Regelungssystemvorrichtung nach Anspruch 7, wobei:
die Bereichsbenutzerschnittstelle eine per Hand von einem Anlagenbenutzer bediente Thermostateinrichtung ist, die in der Lage ist, ein entsprechendes Signal an die Bereichssteuerung zu senden.
10. Regelungssystemvorrichtung nach Anspruch 7, wobei:
die Bereichsbenutzerschnittstelle ein Gebäudeleitsystem (54) ist, das in der Lage ist, ein entsprechendes Signal an die Bereichssteuerung zu senden.
11. Regelungssystemvorrichtung nach Anspruch 6, wobei:
das der Zulufttemperatur entsprechende Signal mit einem Signal zu einem gefährlichen Geräteausfall verglichen wird und so ein Signal zu einem gefährlichen Gerätezustand (302) erzeugt wird; und
darauf reagierend den gefährlichen Zustand an den Anlagenbetreiber übermittelt.
12. Regelungssystemvorrichtung nach Anspruch 6, wobei:
die Bereichssteuerung eine Einrichtung auf Mikroprozessorbasis ist, die in der Lage ist, die entsprechenden Signale von den Sensoren zu empfangen und Steuersignale an die Ventilantriebe, Kühlgebläse, Bauteilausfalleinrichtungen und Einrichtungen zur Alarmierung bei gefährlichen Gerätezuständen zu liefern.
1. Procédé de commande d'un système de conditionnement d'air (10) du type ayant un opérateur de système (51), un système de gestion de bâtiment (54), une bobine d'échangeur de chaleur (32) avec un liquide de refroidissement s'écoulant au travers, et un écoulement d'air circulant au travers, comprenant les étapes de :
obtention d'une température d'alimentation de liquide de refroidissement d'un liquide de refroidissement d'alimentation (35) entrant dans ladite bobine ;
obtention d'une température de retour de liquide de refroidissement d'un liquide de refroidissement de retour (38) sortant de ladite bobine ;
comparaison de ladite température d'alimentation de liquide de refroidissement à ladite température de retour de liquide de refroidissement pour obtenir une température delta de liquide de refroidissement ;
établissement d'un point de consigne de température delta de liquide de refroidissement (120) ;
comparaison de ladite température delta de liquide de refroidissement audit point de consigne de température delta de liquide de refroidissement pour obtenir une erreur de température delta de liquide de refroidissement ;
fourniture d'au moins une vanne (34) pour commander l'écoulement de liquide de refroidissement à travers ladite bobine ;
actionnement de ladite vanne en réponse à ladite erreur de température delta de liquide de refroidissement ;
caractérisé par la détermination d'une température d'air d'alimentation ;
la détermination d'une température d'air de retour ;
la comparaison de ladite température d'air d'alimentation à ladite température d'air de retour pour obtenir un point d'erreur de température d'air ;
l'établissement d'un point de consigne de défaillance de composant ;
la comparaison dudit point d'erreur de température d'air audit point de consigne de défaillance de composant ; et
en réponse, l'alerte d'au moins l'un d'un utilisateur de système et d'un système de gestion de bâtiment d'une défaillance de composant.
2. Procédé selon la revendication 1 de commande d'un système de conditionnement d'air, comprenant les étapes supplémentaires de :
obtention d'une température d'air de zone climatisée ;
obtention d'un point de consigne de température de zone climatisée (9) ;
comparaison de ladite température d'air de zone audit point de consigne de température de zone pour obtenir une valeur d'erreur de point de consigne de zone ; et
actionnement de ladite vanne en réponse à ladite valeur d'erreur de point de consigne de zone.
3. Procédé selon la revendication 1 de commande d'un système de conditionnement d'air, comprenant les étapes supplémentaires de :
détermination si le système est dans un mode de refroidissement ;
établissement d'une limite de température basse de composant côté alimentation ;
comparaison de ladite température d'air d'alimentation à ladite limite de température basse de composant côté alimentation ; et
en réponse, augmentation de la température de liquide de refroidissement côté alimentation.
4. Procédé selon la revendication 1 de commande d'un système de conditionnement d'air, comprenant les étapes supplémentaires de :
détermination si le système est dans un mode de chauffage ;
établissement d'un point de consigne de limite supérieure de douche froide ;
comparaison dudit point d'erreur de température d'air audit point de limite supérieure de douche froide ;
en réponse, augmentation de l'ordre de température de liquide de refroidissement côté alimentation ; et
en réponse, réduction de la vitesse d'au moins l'un d'un ventilateur d'air d'alimentation (20).
5. Procédé selon la revendication 1 de commande d'un système de conditionnement d'air, comprenant les étapes supplémentaires de :
obtention dudit point d'erreur de température d'air ;
établissement d'un point de consigne de surchauffe de composant d'alimentation ;
comparaison dudit point d'erreur de température d'air audit point de consigne de surchauffe de composant ; et
en réponse, arrêt dudit système de conditionnement d'air.
6. Appareil de système de commande pour un système de conditionnement d'air du type ayant un dispositif de commande de zone, une bobine d'échangeur de chaleur (32) avec un liquide de refroidissement s'écoulant au travers commandée par une vanne de commande de liquide de refroidissement (34), et un écoulement d'air circulant au travers, comprenant :
un capteur de température d'alimentation de liquide de refroidissement (36) pour envoyer un signal représentatif au dispositif de commande de zone ;
un capteur de température de retour de liquide de refroidissement (37) pour envoyer un signal représentatif au dispositif de commande de zone ;
dans lequel le dispositif de commande de zone est capable de développer une température delta de liquide de refroidissement en réponse à ladite température d'alimentation de liquide de refroidissement représentative et auxdits signaux représentatifs de température de retour de liquide de refroidissement et de comparer ladite température delta de liquide de refroidissement par rapport à un point de consigne de température delta pour générer un signal d'erreur de température delta de liquide de refroidissement (118) ;
un actionneur de vanne qui fonctionne en réponse audit signal d'erreur de température delta de liquide de refroidissement pour actionner ladite vanne de commande d'écoulement de liquide de refroidissement ;
caractérisé par un capteur de température d'air d'alimentation (24) pour envoyer un signal représentatif au dispositif de commande de zone ;
un capteur d'air de retour (16) qui est capable d'envoyer un signal représentatif audit dispositif de commande de zone ;
dans lequel ledit dispositif de commande de zone est capable de développer un signal de température delta d'air (202) en réponse audit signal représentatif de température d'air de zone et audit signal représentatif de température d'air de retour et de comparer ledit signal de température delta d'air à un paramètre de défaillance de composant de système pour générer un signal de statut de composant de système (208) ; et
en réponse, communique ladite défaillance de composant de système à un opérateur de système.
7. Appareil de système de commande selon la revendication 6, et comportant en outre :
un capteur de température d'air de zone pour envoyer un signal représentatif au dispositif de commande de zone ;
et un dispositif de réglage de point de consigne d'interface utilisateur de température de zone capable de communiquer un point de consigne de température de zone audit dispositif de commande de zone ;
dans lequel le dispositif de commande de zone est capable de développer un signal de point d'erreur de point de consigne de zone en réponse audit signal de température d'air de zone et audit point de consigne de température de zone ; et
dans lequel ledit actionneur de vanne fonctionne en réponse en outre audit signal de point d'erreur de point de consigne pour actionner ladite vanne de commande d'écoulement de liquide.
8. Appareil de système de commande selon la revendication 7, dans lequel :
ledit capteur de température d'air de zone est un dispositif thermostatique situé dans la zone qui est capable d'envoyer un signal représentatif audit dispositif de commande de zone.
9. Appareil de système de commande selon la revendication 7, dans lequel :
ladite interface utilisateur de zone est un dispositif thermostatique exploité manuellement par un utilisateur de système qui est capable d'envoyer un signal représentatif au dispositif de commande de zone.
10. Appareil de système de commande selon la revendication 7, dans lequel :
ladite interface utilisateur de zone est un système de gestion de bâtiment (54) qui est capable d'envoyer un signal représentatif audit dispositif de commande de zone.
11. Appareil de système de commande selon la revendication 6, dans lequel :
ledit signal représentatif de température d'air d'alimentation est comparé à un signal de défaillance d'équipement dangereux pour générer un signal de statut d'état d'équipement dangereux (302) ; et
en réponse, communique ledit statut dangereux à l'opérateur de système.
12. Appareil de système de commande selon la revendication 6, dans lequel :
ledit dispositif de commande de zone est un dispositif à base de microprocesseur capable de recevoir lesdits signaux représentatifs en provenance desdits capteurs et de fournir des signaux de fonctionnement auxdits actionneurs de vanne, à des ventilateurs de refroidissement, à des dispositifs de défaillance de composant, et à des dispositifs d'alerte de statut d'équipement dangereux.