CN106440111B - Central air-conditioning cold station system and water system topological graph construction method - Google Patents
Central air-conditioning cold station system and water system topological graph construction method Download PDFInfo
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- CN106440111B CN106440111B CN201610861920.1A CN201610861920A CN106440111B CN 106440111 B CN106440111 B CN 106440111B CN 201610861920 A CN201610861920 A CN 201610861920A CN 106440111 B CN106440111 B CN 106440111B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title description 9
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 22
- 238000004891 communication Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 13
- 238000011161 development Methods 0.000 description 10
- 238000007710 freezing Methods 0.000 description 6
- 230000008014 freezing Effects 0.000 description 6
- 230000006855 networking Effects 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000003032 molecular docking Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the invention discloses a central air-conditioning cold station system and a method for constructing a topological graph of a water system. The system comprises a CAN bus and at least two cold station equipment groups, wherein each cold station equipment group comprises at least one cold station equipment module, and each cold station equipment module comprises a virtual interface; the CAN bus is connected with the cold station equipment module, so that the cold station equipment module realizes data transmission through the CAN bus; the cold station equipment module comprises cold station equipment and an equipment controller, wherein the equipment controller is connected with the cold station equipment and used for acquiring running information of the connected cold station equipment and controlling the cold station equipment according to the set virtual interface connection relation and the running information of other cold station equipment. According to the technical scheme of the embodiment of the invention, each cold station device is provided with one device controller, and the cold station devices are controlled by adopting a CAN bus communication mode among the device controllers, so that the field wiring work is reduced by more than 50%, and the field wiring is simple and convenient, the efficiency is high, and the error rate is low.
Description
Technical Field
The embodiment of the invention relates to the technical field of central air conditioners, in particular to a method for constructing a topological graph of a central air conditioner cold station system and a water system.
Background
The central air-conditioning cold station provides air-conditioning chilled water for public buildings, and generally comprises a cooler, a freezing pump, a cooling tower, a valve, an automatic control system and the like. The automatic control system of the central air-conditioning cold station can realize automatic management and control, greatly improve the automation level of the cold station, reduce the input of management manpower and material resources and improve the energy efficiency level of the central air-conditioning system.
The automatic control system of the traditional central air-conditioning cold station is provided by an independent group control manufacturer, namely: in actual engineering, cold station equipment such as: the refrigerator, the freezing pump, the cooling tower, the electric valve and the like are provided by equipment suppliers, and the automatic control system is provided by a group control manufacturer. The traditional automatic control system for the central air-conditioning cold station mainly has the following characteristics:
1) the DDC controller is connected with field devices such as a refrigerator, a pump, a cooling tower fan, an electric regulating valve, a water temperature sensor, a flow sensor, a differential pressure sensor and the like through a large number of IO interfaces, collects sensor measurement values and state feedback information of actuating mechanisms, and outputs control instructions to the actuating mechanisms.
2) In the development process, since the system form, the number of devices, and the control requirement of each project are different, the control program of each project needs to be redeveloped.
3) A lot of field wiring and networking configuration work is required. In order to match the connection topology of the automatic control system with the physical connection topology of the actual system, networking configuration work needs to be performed on the control system. The networking configuration refers to reflecting physical information points of actual equipment such as sensors and actuators to an automatic control system, corresponding to variables in the control system, and comprising physical connection and software setting of the information points. The number of information points of a cold station control system is large, so that the workload of manual networking configuration is huge, and configuration needs to be completed on site by professional engineers.
Because the traditional automatic control system of the central air-conditioning cold station is centralized and independent of field equipment, order development needs very professional personnel, the development period of the process control program is long, the workload of field wiring and networking configuration is large, and the large-scale development, popularization and application of the automatic control system of the central air-conditioning cold station are limited.
Disclosure of Invention
The embodiment of the invention provides a central air-conditioning cold station system and a method for constructing a topological graph of a water system, which are used for solving the problems of large development workload, long development period and large workload of field wiring and networking configuration in the conventional central air-conditioning cold station system in order to develop the traditional central air-conditioning cold station system in a form-by-form manner.
In a first aspect, an embodiment of the present invention provides a central air-conditioning cold station system, including:
the system comprises a CAN bus and at least two cold station equipment groups, wherein each cold station equipment group comprises at least one cold station equipment module, and each cold station equipment module comprises a virtual interface;
the CAN bus is connected with the cold station equipment module so that the cold station equipment module realizes data transmission through the CAN bus;
the cold station equipment module comprising: the cold station equipment and the equipment controller are connected with the cold station equipment and used for acquiring the running information of the connected cold station equipment and controlling the cold station equipment according to the set virtual interface connection relation and the running information of other cold station equipment.
Further, the cold station apparatus includes a chiller, a pump, and a cooling tower.
Further, the cold station equipment module includes at least 2 virtual interfaces.
In a second aspect, an embodiment of the present invention further provides a method for constructing a topological graph of a water system of a central air conditioning cold station, including:
the device controller reads the imported virtual interface butt-joint table and determines the connection relation of the cold station devices;
and generating a water system topological graph according to a preset rule according to the connection relation.
Further, the generating a water system topological graph according to a preset rule includes:
determining a type of the cold station device;
the connection of the same type of cold station equipment is set to be parallel, and the connection of different types of cold station equipment is set to be series.
Further, the generating a water system topological graph according to a preset rule further comprises:
when the cold station equipment is a pump, determining the type of the cold station equipment connected with the pump, and determining the attribute of the pump according to the type of the cold station equipment, wherein the attribute of the pump comprises: cooling pumps and freeze pumps.
Each cold station device is provided with a device controller, and the device controllers control the cold station devices in a CAN bus communication mode. The wiring configuration work of the cold station equipment and the equipment controller is finished before site construction, and the site construction only needs to connect the cold station equipment module to the CAN bus, so that the site wiring construction work is reduced by more than 50 percent, and meanwhile, the site wiring is simple and convenient, the efficiency is high, and the error rate is low. The equipment controller acquires the running information of the cold station equipment correspondingly connected, and controls the cold station equipment according to the set virtual interface connection relation and the running information of other cold station equipment, so that the centralized control of a central controller is replaced by a traditional central air conditioner, and the intelligent and distributed control of the cold station equipment is realized. The control program of the central air-conditioning cold station control system is suitable for different working environments, secondary development is not needed for different orders, and development work of the central air-conditioning cold station system is greatly simplified.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic structural diagram of a central air-conditioning cold station system according to a first embodiment of the present invention;
fig. 2a is a schematic view of a virtual interface connection of a cold station device in a method for constructing a topology diagram of a central air-conditioning cold station water system according to a second embodiment of the present invention;
fig. 2b is a schematic topology diagram of a central air conditioning cold station water system in the method for constructing a topology diagram of a central air conditioning cold station water system according to the second embodiment of the present invention.
The reference numerals in the drawings respectively refer to the technical features:
100. a CAN bus; 200. a cold station equipment group; 210. a cold station equipment module;
211. a device controller; 212. a cold station device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a central air-conditioning cold station system provided in this embodiment. Referring to fig. 1, the central air-conditioning cold station system of the present embodiment includes: a CAN bus 100 and at least two cold station equipment groups 200, said cold station equipment groups 200 comprising at least one cold station equipment module 210, said cold station equipment module comprising a virtual interface; wherein,
the CAN bus 100 is connected to the cold station device module 210, so that the cold station device module 210 realizes data transmission through the CAN bus 100;
the cold station equipment module 210, comprising: the equipment controller 211 is connected with the cold station equipment 212 and used for acquiring the running information of the connected cold station equipment 212 and controlling the cold station equipment 212 according to the set virtual interface connection relation and the running information of other cold station equipment 212.
The control system of the central air-conditioning cold station in the embodiment adopts a communication mode of a CAN bus. Nodes on the CAN bus access the bus in a non-destructive bit-by-bit arbitration mode, which is also called carrier sense multiple access with collision avoidance and an access mode based on message priority arbitration. The CAN protocol is Based on messages (Message Based) rather than addresses (Address Based), nodes connected to the bus do not have information like "addresses", and messages are not passed from node to node Based on addresses. Therefore, the 'hot plug' of the bus node is supported, namely, when the node is added or reduced on the bus, the firmware and the application layer of other nodes on the bus do not need to be changed. Based on the characteristics of the CAN bus, the control system CAN be widely applied, and the influence on the whole cold station is maximally reduced when the cold station equipment fails.
The cold station equipment module is directly connected to the CAN bus, transmits data to the CAN bus or transmits the data received by the CAN to the CAN controller through the CAN transceiver, and the CAN controller processes the data and transmits the data to the CAN transceiver so as to complete the data transmission. The cold station equipment module also comprises at least 2 virtual interfaces, which are not actually existing interfaces but are interfaces generated by setting. Preferably, 4 virtual interfaces can be set for each cold station equipment module to meet the connection requirement between the cold station equipment. For example, the virtual interface is provided on a device controller in the cold station device module, which may be integrated in the cold station device, so the virtual interface of the cold station device module is simply referred to as the virtual interface of the cold station device. The cold station equipment module comprises cold station equipment (such as a refrigerator, a freezing pump, a cooling tower, an electric valve and the like) and an equipment controller. In each cold station equipment module, each cold station equipment is connected with each equipment controller, and the cold station equipment and the equipment controllers are in one-to-one correspondence, namely, each cold station equipment is controlled by one corresponding equipment controller. The connection between the equipment controller and the cold station equipment comprises a series of work such as IO wiring and configuration, for example, the equipment controller can be configured inside the cold station equipment in an integrated mode, and the work can be completed before the equipment controller leaves a factory, so that the wiring and configuration workload of the central air-conditioning cold station control system on site is greatly reduced. The device controller may be directed to different devices such as: the method comprises the following steps of carrying out standardized design on a refrigerator, a pump, a cooling tower, an electric regulating valve and the like, and formulating a corresponding standard information set, wherein the standard information set maximally contains various information of equipment operation. Illustratively, the standard information set of the refrigerator comprises a chilled water inlet temperature, a chilled water outlet temperature, a cooling water inlet temperature, a cooling water outlet temperature, an operation frequency, a guide vane opening, a host machine current and the like of the refrigerator; the standard information set of the pump includes an operation frequency of the pump, a pressure difference across the pump, a flow rate of the pump, and the like.
The equipment controller acquires operation information of cold station equipment correspondingly connected with the equipment controller. The operating information may include setting parameters and operating parameters of the cold station apparatus. Illustratively, the operation information of the refrigerator includes a chilled water inlet temperature, a chilled water outlet temperature, a cooling water inlet temperature, a cooling water outlet temperature, an operation frequency, a guide vane opening, a host machine current and the like of the refrigerator; the operation information of the pump includes the operation frequency of the pump, the pressure difference between the front and the rear of the pump, the flow rate of the pump, and the like. The operation information of the cold station equipment is different according to different order requirements, different operation environments and different operation information. The equipment controllers acquire the running information of the cold station equipment to be correspondingly connected with the equipment controllers, and then send the running information to other equipment controllers through the CAN bus, namely, each equipment controller CAN acquire the running information of other cold station equipment, and control the running of the cold station equipment connected with the equipment controllers according to the running information of other cold station equipment, the running information of the cold station equipment connected with the equipment controllers and the set virtual interface connection relation, so that the different equipment controllers CAN realize the work of communication, operation, coordinated running and the like through a standardized control program. The virtual interface connection relation can be established through a virtual interface butt-joint table imported by a user, and the topological relation of cold station equipment in actual engineering can be determined through the pairing connection of the virtual interfaces of the cold station equipment.
Illustratively, the central air-conditioning cold station system comprises three coolers, three freezing pumps, three cooling pumps and three cooling towers, wherein the set virtual interfaces are connected in parallel to form cold station equipment of the same type, the cold station equipment of the same type, a freezing pump group, a cooling pump group and a cooling tower group, and the cold station equipment groups of different types are connected in series. And determining the topological relation of the central air-conditioning cold station system according to the connection relation of the virtual interfaces. During refrigeration, the outlet water temperature of the chilled water of the refrigerator is set to be 7 ℃, and the inlet water temperature of the chilled water is set to be 12 ℃. And the equipment controller control refrigerator connected with the refrigerator provides chilled water with the temperature of 7 ℃, transmits the data to equipment controllers of all other cold station equipment in a communication mode of a CAN bus, and receives operation information of all other cold station equipment. When the equipment controller connected with the cold machine detects that the inlet temperature of chilled water provided by the cold machine is higher than 12 ℃, the equipment controller connected with the cold machine calculates according to the operating parameters of all cold station equipment and transmits the calculation result to other equipment controllers in the system. The plant controllers negotiate with each other until the calculations converge to seek an optimum operating state that meets the load requirements. And finally, controlling the cold machine set to execute actions according to the final running state, such as starting one or more cold machines again.
The central air-conditioning cold station system provided by the embodiment is characterized in that each cold station device is provided with a device controller,
and the equipment controllers adopt a CAN bus communication mode to control the cold station equipment. The wiring configuration work of the cold station equipment and the equipment controller is finished before site construction, and the site construction only needs to connect the cold station equipment module to the CAN bus, so that the site wiring construction work is reduced by more than 50 percent, and meanwhile, the site wiring is simple and convenient, the efficiency is high, and the error rate is low. The equipment controller acquires the running information of the cold station equipment correspondingly connected, and controls the cold station equipment according to the set virtual interface connection relation and the running information of other cold station equipment, so that the centralized control of a central controller is replaced by a traditional central air conditioner, and the intelligent and distributed control of the cold station equipment is realized. The control program of the central air-conditioning cold station control system is suitable for different working environments, secondary development is not needed for different orders, and development work of the central air-conditioning cold station system is greatly simplified.
Example two
On the basis of the above embodiments, the present embodiment provides a method for constructing a topology map of a central air-conditioning cold station water system, including:
the device controller reads the imported virtual interface butt-joint table and determines the connection relation of the cold station devices;
and generating a water system topological graph according to a preset rule according to the connection relation.
Fig. 2a is a schematic view of a virtual interface connection of a cold station device in a method for constructing a topology diagram of a central air-conditioning cold station water system according to this embodiment; fig. 2b is a schematic topology diagram of a cold station equipment system in the method for constructing a topology diagram of a central air-conditioning cold station water system provided by this embodiment.
In fig. 2a and 2b, C1, C2 and C3 correspond to refrigerator No. 1, refrigerator No. 2 and refrigerator No. 3, respectively, T1, T2, T3, T4, T5 and T6 correspond to pump No. 1, pump No. 2, pump No. 3, pump No. 4, pump No. 5 and pump No. 6, respectively, and P1, P2 and P3 correspond to cooling tower No. 1, cooling tower No. 2 and cooling tower No. 3, respectively.
A user can make a virtual interface butt-joint table according to the physical connection topological relation of cold station equipment in actual engineering. The table is a cold station device virtual interface docking table introduced in the method for constructing a central air-conditioning cold station water system topological diagram provided by this embodiment. The virtual interface docking table can be used for representing the virtual interface pairing relation of each cold station device in the central air-conditioning cold station system. As can be seen from the virtual interface pairing table, pairing C1-1 with C2-1 specifically indicates that virtual interface 1 of the No. 1 refrigerator is connected to virtual interface 1 of the No. 2 refrigerator, and pairing of other interfaces in the virtual interface pairing table is similar to this, which is not described in detail herein. And the equipment controller reads the imported virtual interface butt-joint table and determines the connection relation of the equipment controllers corresponding to the cold station equipment in the central air-conditioning cold station system according to the pairing relation of the virtual interfaces. Fig. 2a shows a schematic diagram of virtual interface connections of a cold station device in a method for constructing a topology diagram of a central air-conditioning cold station water system, which is correspondingly connected according to the virtual interface pairing relationship of the virtual interface pairing table.
Preferably, the generating a water system topological graph according to a preset rule includes: determining a type of the cold station device; the connection of the same type of cold station equipment is set to be parallel, and the connection of different types of cold station equipment is set to be series. For example, the equipment controller determines the type of the cold station equipment, for example, distinguishing the equipment types of a refrigerator, a pump, a cooling tower, and the like, based on the standard format data transmitted to the bus by the cold station equipment. The connection of the same type of cold station equipment is set to be parallel, and the connection of different types of cold station equipment is set to be series. For example, after the chiller, the cooling tower and the pump are connected in parallel and grouped, the chiller unit, the cooling tower unit and the pump unit are connected in series, and fig. 2b is a topological schematic diagram of a cold station equipment system in a construction method of a central air-conditioning cold station water system topological diagram.
Preferably, the generating a water system topological graph according to a preset rule further includes: when the cold station equipment is a pump, determining the type of the cold station equipment connected with the pump, and determining the attribute of the pump according to the type of the cold station equipment, wherein the attribute of the pump comprises: cooling pumps and freeze pumps. Specifically, a pump connected to the cooling tower is defined as a cooling pump, a pump directly connected to the end equipment is defined as a secondary pump, and a pump connected to the main machine is defined as a primary pump. The primary pump and the secondary pump both belong to freezing pumps, the primary pump is mainly responsible for overcoming the resistance of the cold machine side and corresponds to the cold machine set one by one, the design flow of the primary pump is the rated flow of the evaporator of the cold machine set, and the primary pump is enabled to operate at the optimal efficiency working point through reasonable calculation and model selection; the secondary pump is mainly used for overcoming the resistance of end equipment, can be independently arranged on different end loops, and can be independently controlled and subjected to variable frequency regulation according to the load change of the loops.
The method for constructing the topological graph of the water system of the central air-conditioning cold station can establish the topological graph of the water system of the central air-conditioning cold station according to the virtual interface docking table imported by the user. The cold station equipment can be connected without physical connection, so that the operation is simplified, and the efficiency is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A central air conditioning cold station system, characterized in that said system comprises:
the system comprises a CAN bus and at least two cold station equipment groups, wherein each cold station equipment group comprises at least one cold station equipment module, and each cold station equipment module comprises a virtual interface; wherein the virtual interface is not an actually existing interface, and is an interface generated by setting;
the CAN bus is directly connected with the cold station equipment module, so that the cold station equipment module realizes data transmission through the CAN bus;
the cold station equipment module comprising: the equipment controller is connected with the cold station equipment and used for acquiring the running information of the connected cold station equipment and controlling the cold station equipment according to the set virtual interface connection relation and the running information of other cold station equipment; the equipment controllers are integrated in the cold station equipment, each cold station equipment is provided with one equipment controller, and the operation information comprises set parameters and operation parameters of the cold station equipment.
2. The system of claim 1, wherein the cold station apparatus comprises a chiller, a pump, and a cooling tower.
3. The system of claim 1, wherein the cold station equipment module comprises at least 2 virtual interfaces.
4. A method for constructing a water system topology map of a central air conditioning cold station system according to any one of claims 1 to 3, wherein the method comprises:
the device controller reads the imported virtual interface butt-joint table and determines the connection relation of the cold station devices; the virtual interface butt-joint table is used for representing the virtual interface pairing relation of each cold station device in the central air-conditioning cold station system;
and generating a water system topological graph according to a preset rule according to the connection relation.
5. The method of claim 4, wherein the generating a water system topology map according to a preset rule comprises:
determining a type of the cold station device;
the connection of the same type of cold station equipment is set to be parallel, and the connection of different types of cold station equipment is set to be series.
6. The method of claim 5, wherein generating a water system topology map according to a predetermined rule further comprises:
when the cold station equipment is a pump, determining the type of the cold station equipment connected with the pump, and determining the attribute of the pump according to the type of the cold station equipment, wherein the attribute of the pump comprises: cooling pumps and freeze pumps.
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| CN201610861920.1A CN106440111B (en) | 2016-09-28 | 2016-09-28 | Central air-conditioning cold station system and water system topological graph construction method |
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| CN201610861920.1A CN106440111B (en) | 2016-09-28 | 2016-09-28 | Central air-conditioning cold station system and water system topological graph construction method |
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| CN1654893A (en) * | 2005-01-28 | 2005-08-17 | 杨东 | Energy-saving intelligent control system for central air conditioner |
| DE102010007558A1 (en) * | 2010-02-10 | 2011-08-11 | Stiebel Eltron GmbH & Co. KG, 37603 | Building service apparatus e.g. instantaneous water heater, has controller area network units detecting node number based on registration identifier and utilizing node number for communication over controller area network bus |
| CN104238533A (en) * | 2014-10-17 | 2014-12-24 | 成都四为电子信息股份有限公司 | Railway station building electromechanical device monitoring system |
| CN105276761A (en) * | 2015-10-15 | 2016-01-27 | 珠海格力电器股份有限公司 | Control system of air conditioner water system equipment |
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|---|---|---|---|---|
| CN1654893A (en) * | 2005-01-28 | 2005-08-17 | 杨东 | Energy-saving intelligent control system for central air conditioner |
| DE102010007558A1 (en) * | 2010-02-10 | 2011-08-11 | Stiebel Eltron GmbH & Co. KG, 37603 | Building service apparatus e.g. instantaneous water heater, has controller area network units detecting node number based on registration identifier and utilizing node number for communication over controller area network bus |
| CN104238533A (en) * | 2014-10-17 | 2014-12-24 | 成都四为电子信息股份有限公司 | Railway station building electromechanical device monitoring system |
| CN105276761A (en) * | 2015-10-15 | 2016-01-27 | 珠海格力电器股份有限公司 | Control system of air conditioner water system equipment |
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