CN112797567A - Energy-saving diagnosis device for central air-conditioning system - Google Patents
Energy-saving diagnosis device for central air-conditioning system Download PDFInfo
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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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
- F24F11/62—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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- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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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
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Abstract
The invention belongs to the technical field of air conditioner energy-saving control, and particularly relates to an energy-saving diagnosis device of a central air-conditioning system, which comprises a monitoring host and a data acquisition module, wherein the monitoring host comprises hardware equipment and energy-saving diagnosis software, the energy-saving diagnosis software is designed according to an energy efficiency parameter model, can calculate energy efficiency parameters in real time according to the acquired parameters, and judges the energy efficiency level of the central air-conditioning system through the comparison of the calculated energy efficiency parameters and a specified value; the data acquisition module comprises a plurality of sub-modules, each sub-module comprises a sensor and a data acquisition instrument, the sensors transmit acquired original data to the data acquisition instruments through signal lines, the data acquisition instruments perform primary processing on the original data and transmit the processed data to the monitoring host through the signal lines, and the monitoring host performs secondary processing on the received data to obtain energy efficiency parameters.
Description
Technical Field
The invention belongs to the technical field of air conditioner energy-saving control, and particularly relates to an energy-saving diagnosis device for a central air-conditioning system.
Background
The energy efficiency level of the central air-conditioning system is directly related to factors such as design, construction quality, operation maintenance and the like, but the energy efficiency level of the central air-conditioning system is low due to the fact that operation energy-saving diagnosis is often lacked in the operation process of the central air-conditioning system.
Disclosure of Invention
The invention provides an energy-saving diagnosis device for a central air-conditioning system, aiming at the problems.
In order to achieve the purpose, the invention adopts the technical scheme that: an energy-saving diagnosis device of a central air-conditioning system comprises a monitoring host and a data acquisition module, wherein the monitoring host comprises hardware equipment and energy-saving diagnosis software, the energy-saving diagnosis software is designed according to an energy efficiency parameter model, can calculate energy efficiency parameters in real time according to the acquired parameters, and judges the energy efficiency level of the central air-conditioning system through the comparison of the calculated energy efficiency parameters with a specified value; the data acquisition module comprises a plurality of sub-modules, each sub-module comprises a sensor and a data acquisition instrument, the sensors transmit acquired original data to the data acquisition instruments through signal lines, the data acquisition instruments perform primary processing on the original data and transmit the processed data to the monitoring host through the signal lines, and the monitoring host performs secondary processing on the received data to obtain energy efficiency parameters.
Preferably, the energy efficiency parameter model comprises a heating performance coefficient EERsys model, a refrigeration energy efficiency ratio COPsys model, a water pump operation efficiency eta model and a rock-soil cold and hot imbalance coefficient beta model.
Preferably, the plurality of sub-modules of the data acquisition module include a power distribution data acquisition sub-module and a user side data acquisition sub-module.
Preferably, the sensors in the distribution data acquisition submodule comprise a current sensor and a voltage sensor, and the current sensor and the voltage sensor are arranged on distribution cables of the air conditioning unit and the water pump; the data acquisition instrument in the power distribution data acquisition submodule is a three-phase electric quantity acquisition instrument, the input end of the three-phase electric quantity acquisition instrument is connected with a current sensor and a voltage sensor through a signal line, and the output end of the three-phase electric quantity acquisition instrument is connected with a monitoring host through a signal line.
Preferably, the sensors in the user side data acquisition submodule comprise a first temperature sensor and a first flow sensor, the first flow sensor is installed on a user side water outlet main pipeline, and the first temperature sensor is installed on a user side water inlet main pipeline and a user side water outlet main pipeline; the data acquisition instrument in the user side data acquisition submodule is a first cold and heat acquisition instrument, the input end of the first cold and heat acquisition instrument is connected with the temperature sensor and the flow sensor through signal lines, and the output end of the first cold and heat acquisition instrument is connected with the monitoring host through signal lines.
Preferably, the data acquisition module further comprises a source side data acquisition submodule, sensors in the source side data acquisition submodule comprise a second temperature sensor and a second flow sensor, the second flow sensor is installed on a cold source or heat source side heat transfer medium circulation pipeline, and the second temperature sensor is installed at two interfaces of the cold source or heat source side heat transfer medium circulation pipeline and a heat exchanger; the data acquisition instrument in the source side data acquisition submodule is a second cold and heat acquisition instrument, the input end of the second cold and heat acquisition instrument is connected with the temperature sensor through a signal line, and the output end of the second cold and heat acquisition instrument is connected with the monitoring host through a signal line.
Preferably, the hardware device of the monitoring host comprises a memory, a processor, a display and a communication module.
Preferably, the primary processing of the raw data by the data acquisition instrument is to process the raw data to obtain a parameter value for establishing an energy efficiency parameter model.
Preferably, the monitoring host performs secondary processing on the received data, namely the monitoring host assigns the received data to the energy efficiency parameter model for calculation, and then compares the calculated value with the specified value of the energy efficiency parameter to obtain a conclusion.
Compared with the prior art, the invention has the advantages and positive effects that: the method comprises the following steps that the acquired original data are transmitted to a data acquisition instrument through signal lines by the sensors, the original data are processed by the data acquisition instrument for the first time, the processed data are transmitted to a monitoring host through the signal lines, and the received data are processed by the monitoring host for the second time, so that energy efficiency parameters are obtained. And judging the energy efficiency level of the central air-conditioning system by comparing the energy efficiency parameter with a specified value, analyzing the influence factors of the running energy consumption of the central air-conditioning system, and formulating energy-saving optimization measures, so that the running energy efficiency level of the central air-conditioning system is improved, and the running cost is reduced.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required to be used in the description of the embodiment will be briefly introduced below, fig. 1 is a structural diagram of an energy-saving diagnostic device of a central air-conditioning system, and fig. 2 is a structural schematic diagram of a ground source heat pump central air-conditioning system provided in the embodiment 1.
1-monitoring host computer, 2-distribution data acquisition submodule, 3-source side data acquisition submodule, 4-user side data acquisition submodule, 21-three-phase electric quantity acquisition instrument one, 22-three-phase electric quantity acquisition instrument two, 31-cold heat acquisition instrument two, 41-cold heat acquisition instrument one, 5-user side, 6-ground source heat pump air conditioning unit, 7-ground heat exchanger, 61-heat exchanger of ground source heat pump air conditioning unit one, 62-heat exchanger of ground source heat pump air conditioning unit two, 8-user side main water outlet pipeline, 9-user side main water inlet pipeline, 10-main water outlet pipeline of ground heat exchanger, 11-main water inlet pipeline of ground heat exchanger.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the specific embodiments of the present disclosure.
Example 1
An energy-saving diagnosis device of a central air-conditioning system is shown in figure 1 and comprises a monitoring host 1 and a data acquisition module, wherein the monitoring host 1 comprises hardware equipment and energy-saving diagnosis software, the energy-saving diagnosis software is designed according to energy efficiency parameter models, can calculate energy efficiency parameters in real time according to the acquired parameters, and judges the energy efficiency level of the central air-conditioning system through the comparison of the calculated energy efficiency parameters with specified values;
the data acquisition module comprises a plurality of sub-modules, each sub-module comprises a sensor and a data acquisition instrument, the sensors transmit acquired original data to the data acquisition instruments through signal lines, the data acquisition instruments perform primary processing on the original data and transmit the processed data to the monitoring host 1 through the signal lines, and the monitoring host 1 performs secondary processing on the received data, so that energy efficiency parameters are obtained.
The energy efficiency parameter model comprises a heating performance coefficient EERsys model, a refrigeration energy efficiency ratio COPys model, a water pump running efficiency eta model and a rock-soil cold-hot imbalance coefficient beta model.
As shown in fig. 1, the multiple sub-modules of the data acquisition module include a power distribution data acquisition sub-module 2 and a user side data acquisition sub-module 4, the source side data acquisition sub-module 3 is an optional item, and is an essential item for a ground source heat pump central air-conditioning system, a water source heat pump central air-conditioning system and a water chiller central air-conditioning system, wherein the source side of the water chiller central air-conditioning system is a cooling tower, and the source side data acquisition sub-module 3 measures a cooling tower loop.
The sensors in the distribution data acquisition submodule 2 comprise a current sensor and a voltage sensor, and the current sensor and the voltage sensor are arranged on distribution cables of the air conditioning unit and the water pump; the data acquisition instrument in the power distribution data acquisition submodule 2 is a three-phase electric quantity acquisition instrument, the input end of the three-phase electric quantity acquisition instrument is connected with the current sensor and the voltage sensor through signal lines, and the output end of the three-phase electric quantity acquisition instrument is connected with the monitoring host through signal lines.
As shown in fig. 1, the sensors in the user side data acquisition submodule 4 include a first temperature sensor and a first flow sensor, the first flow sensor is installed on a user side water outlet main pipeline, and the first temperature sensor is installed on a user side water inlet main pipeline and a user side water outlet main pipeline; the data acquisition instrument in the user side data acquisition submodule 4 is a second cold and heat acquisition instrument 31, the input end of the second cold and heat acquisition instrument 31 is connected with the temperature sensor and the flow sensor through signal lines, and the output end of the second cold and heat acquisition instrument 31 is connected with the monitoring host through signal lines.
As shown in fig. 1, the sensors in the source side data acquisition submodule 3 include a second temperature sensor and a second flow sensor, the second flow sensor is installed on the cold source or heat source side heat transport medium circulation pipeline, and the second temperature sensor is installed at two interfaces between the cold source or heat source side heat transport medium circulation pipeline and the heat exchanger; the data acquisition instrument in the source side data acquisition submodule 3 is a first cold and heat acquisition instrument 41, the input end of the first cold and heat acquisition instrument 41 is connected with the temperature sensor through a signal line, and the output end of the first cold and heat acquisition instrument 41 is connected with the monitoring host through a signal line.
The hardware devices of the monitoring host 1 include a memory, a processor, a display, and a communication module.
The data acquisition instrument processes the original data for one time, namely, the original data are processed to obtain parameter values for establishing an energy efficiency parameter model.
The monitoring host 1 carries out secondary processing on the received data, namely the monitoring host 1 assigns the received data to an energy efficiency parameter model for calculation, and then compares the calculated value with an energy efficiency parameter specified value to obtain a conclusion.
Examples are:
as shown in fig. 2, the energy-saving diagnostic apparatus of the central air-conditioning system of the present embodiment is used for a ground source heat pump central air-conditioning system, which uses rock-soil mass as a cold and heat source and is composed of a ground source heat pump air-conditioning unit 6, a ground source heat circulating water pump, a user side circulating water pump, a buried pipe heat exchanger 7, a user side 5, a pipeline, and the like. The ground heat exchanger 7, the ground source heat circulating water pump and the first heat exchanger 61 of the ground source heat pump air conditioning unit are connected end to end by pipelines to form a ground source side loop; the user side 5, the user side circulating water pump and the second heat exchanger 62 of the ground source heat pump air conditioning unit are connected end to end by pipelines to form a user side loop. The ground side loop and the user side loop are closed loops, and the circulating medium is water.
When the user side refrigerates, the ground source heat pump air conditioning unit 6 discharges heat to the underground rock-soil body through the ground heat exchanger 7; when the user side heats, the ground source heat pump air conditioning unit 6 absorbs heat to the underground rock and soil mass through the ground heat exchanger 7. The rock-soil body mainly plays a role in storing low-grade heat. The difference of the heat quantity discharged into and absorbed by the ground source heat pump air conditioning unit 6 from the rock-soil mass is within a certain range.
The energy-saving diagnosis device of the ground source heat pump central air-conditioning system comprises: the monitoring system comprises a monitoring host 1, a power distribution data acquisition submodule 2, a source side data acquisition submodule 3 and a user side data acquisition submodule 4, wherein the hardware configuration is respectively shown in a table 1 and a table 2, and the installation position of a sensor is shown in a table 3. The monitoring host 1 and each data acquisition submodule are provided with standard RS485 interfaces, and adopt the same modbus communication protocol to transmit data through the connection of signal lines.
TABLE 1 monitoring host configuration
TABLE 2 data acquisition Module composition
TABLE 3 sensor mounting location
As shown in table 1, the monitoring host 1 is used for data receiving, storing, analyzing, displaying, and remote communication functions. The hardware of the monitoring host 1 includes a memory, a processor, a display, a communication module, and the like. The energy-saving diagnosis software is designed according to an energy efficiency parameter model, and calculates energy efficiency parameters in real time according to collected data, wherein the optional energy efficiency parameter model comprises a heating performance coefficient EERsys of the central air-conditioning system, a refrigeration energy efficiency ratio COPys of the central air-conditioning system, a rock-soil cold-hot imbalance coefficient beta and the like.
(1) Heating performance coefficient EERsys of central air-conditioning system
In the formula: EERsys-the coefficient of heating performance of the central air conditioning system; QSC-the heating capacity of the air conditioning unit; the sigma Nic-air conditioner unit consumes less power during heating; sigma Njc-the circulating water pump consumes less power during heating. And comparing the heating performance coefficient EERsys of the central air-conditioning system with a specified value, and judging the level of the energy efficiency parameter.
According to the design standard of public building energy conservation, a specified value of a heating performance coefficient EERsys of the central air-conditioning system is determined, when the heating performance coefficient EERsys of the central air-conditioning system is larger than or equal to the specified value, the energy efficiency level is high, the system is energy-saving, otherwise, the system is not energy-saving.
(2) Refrigeration energy efficiency ratio COPsys of central air-conditioning system
In the formula: COPsys-the refrigeration energy efficiency ratio of the central air conditioning system; QSH-refrigerating capacity of air conditioning unit; sigma Nih-cooling air-time modulator group eliminates power consumption; Σ Njh-the circulating water pump consumes power during refrigeration. And comparing the refrigeration energy efficiency ratio COPsys of the central air-conditioning system with a specified value, and judging the level of the energy efficiency parameter.
According to the design standard of public building energy conservation, a specified value of the refrigeration energy efficiency ratio COPys of the central air-conditioning system is determined, and when the refrigeration energy efficiency ratio COPys of the central air-conditioning system is larger than or equal to the specified value, the energy efficiency level is high, the system is energy-saving, otherwise, the system is not energy-saving.
(3) Rock-soil cold-hot unbalance coefficient beta
β＝Qx/Qp
Qx-heat quantity absorbed to underground rock and soil during heating; qp-the heat rejected to the underground rock during refrigeration. The cold-hot unbalance coefficient beta of the rock soil needs to be controlled within plus or minus 15%, otherwise, the rock soil temperature cannot be naturally recovered, and the energy efficiency level of the system is further influenced.
As shown in tables 2 and 3, the power distribution data acquisition submodule 2 employs two three-phase power acquisition instruments, and three current sensors and three voltage sensors are respectively configured, and each sensor is connected to the three-phase power acquisition instrument by using a signal line. The sensors are installed at the positions of the air conditioning unit and the distribution main cable of the circulating water pump, the three-phase electric quantity acquisition instrument I21 and the three-phase electric quantity acquisition instrument II 22 can respectively acquire distribution data of the air conditioning unit and the circulating water pump, and the power consumption of the air conditioning unit and the power consumption of the circulating water pump are acquired through primary processing of original data. The Thai P666 three-phase electric quantity acquisition instrument selected for use in the technical scheme is provided with a processor, is connected with a current sensor and a voltage sensor, can complete calculation of electric quantity data according to a built-in program, is provided with a standard RS485 interface, adopts the same modbus communication protocol, and performs data transmission with a monitoring host 1 through a signal line.
As shown in tables 2 and 3, the source-side data acquisition submodule 3 and the user-side data acquisition submodule 4 are respectively provided with a second cold and heat acquisition instrument 31 and a first cold and heat acquisition instrument 41, and are respectively provided with two temperature sensors and one flow sensor, and the sensors are connected with the cold and heat acquisition instruments through signal lines. The sensors are arranged on a main pipeline of the buried pipe heat exchanger and a main pipeline at a user side, the cold and heat quantity acquisition instrument can acquire water inlet and outlet temperature and water flow data, and heat quantity absorbed by underground rock soil during heating, heat quantity discharged into the underground rock soil during cooling, refrigerating capacity of the air conditioning unit and heating capacity of the air conditioning unit are obtained through primary data processing. The rainbow OHR-F660 cold and heat quantity acquisition instrument selected by the technical scheme is provided with a 32-bit microprocessor, can complete the calculation of cold (heat) quantity according to a built-in program after being provided with a temperature sensor and a flow sensor, is provided with a standard RS485 interface, adopts a modbus communication protocol for communication, and is in data transmission with a monitoring host through a signal line.
The method comprises the following steps that the acquired original data are transmitted to a data acquisition instrument through signal lines by the sensors, the original data are processed by the data acquisition instrument for the first time, the processed data are transmitted to a monitoring host through the signal lines, and the received data are processed by the monitoring host for the second time, so that energy efficiency parameters are obtained. And judging the energy efficiency level of the central air-conditioning system by comparing the energy efficiency parameter with a specified value, and analyzing the factors influencing the running energy consumption of the central air-conditioning system to formulate energy-saving optimization measures, thereby improving the running energy efficiency level of the central air-conditioning system and reducing the running cost.
Optional energy-saving optimization measures include, but are not limited to, optimization of circulating water pumps, optimization of air conditioning units and optimization of auxiliary equipment.
Optimizing a circulating water pump: cleaning a circulating water pump filter to reduce partial local resistance; the water seal, the bearing and the like of the circulating water pump are maintained, so that the circulating water pump is prevented from working with diseases; installing or starting a circulating water pump frequency converter, and adjusting working parameters of the frequency converter according to the load change condition; after the frequency conversion technology is adopted, when the efficiency of the circulating water pump is still low, the high-efficiency circulating water pump matched with the system flow and the lift is replaced.
Optimizing an air conditioning unit: the heat exchanger of the air conditioning unit is cleaned regularly, the scaling of the heat exchanger is removed, and the heat conduction of the heat exchanger is recovered; replacing the aged air conditioning unit with the performance coefficient not meeting the standard; and adding small units when the air conditioning unit is in low-load-rate operation or is frequently started for a long time.
Auxiliary equipment optimization: the heat compensation (discharge) equipment of the central air-conditioning system of the ground source heat pump or the water source heat pump is improved. The transformation mode comprises the following steps: when the temperature of the circulating water at the ground source side is low in winter, for example, the heat compensation adopts direct compensation of electric energy, the electric energy consumption can adopt waste heat compensation and solar energy compensation according to local conditions, or an air source heat pump is adopted to replace the electric energy for direct compensation; when the circulating water temperature on the ground source side is high in summer, the unit efficiency is low, and auxiliary heat dissipation can be performed in the form of a cooling tower and the like.
The embodiment of the invention is used for measuring the energy efficiency parameters of the air source heat pump central air-conditioning system, the air source heat pump central air-conditioning system takes the atmosphere as a cold and heat source, and the air source heat pump central air-conditioning system comprises an air source heat pump air-conditioning unit, a user side circulating water pump, a user side, a pipeline and the like. The user side, the user side circulating water pump and the air source heat pump air conditioning unit are connected end to end through pipelines to form a user side loop, the loop is a closed loop, and a circulating medium is water.
When the user side refrigerates, the air source heat pump air conditioning unit discharges heat to the atmosphere; when the user side heats, the air source heat pump air conditioning unit draws heat from the atmosphere.
The embodiment of the invention comprises the following steps: the monitoring system comprises a monitoring host 1, a power distribution data acquisition submodule 2 and a user side data acquisition submodule 4, wherein the hardware configuration is respectively shown in tables 4-6, and the installation position of a sensor is shown in table 6. The monitoring host 1 and each data acquisition submodule are provided with standard RS485 interfaces, and adopt the same modbus communication protocol to perform data transmission through the connection of signal lines.
Table 4 monitoring host configuration
| Numbering | Name (R) | Optional specification | Description of the |
|
| 1 | Processor with a memory having a plurality of memory cells | Siemens S7-1200PLC | Data processing, communicating with data acquisition sub-module | |
| 2 | Memory and display | Kunlun state TPC1071Gi | Data display and |
|
| 3 | Communication module | Somersault USR- | Remote communication | |
| 4 | Power supply | DC switch power supply 24v | Power supply for monitoring host and |
|
| 5 | Cabinet | 450*350*300(mm) | Installing and monitoring each part of the host |
TABLE 5 data acquisition Module composition
TABLE 6 sensor mounting location
The monitoring host 1 is used for data receiving, storing, analyzing, displaying, remote communication and other functions. The hardware of the monitoring host 1 includes a memory, a processor, a display, a communication module, and the like.
The energy-saving diagnosis software is designed according to an energy efficiency parameter model, and calculates energy efficiency parameters in real time according to acquired data, wherein the selectable energy efficiency parameter model comprises a heating performance coefficient EERsys of the central air-conditioning system, a refrigeration energy efficiency ratio COPys of the central air-conditioning system and the like.
(1) Heating performance coefficient EERsys of central air-conditioning system
In the formula: EERsys-the coefficient of heating performance of the central air conditioning system; QSC-the heating capacity of the air conditioning unit; the sigma Nic-air conditioner unit consumes less power during heating; sigma Njc-the circulating water pump consumes less power during heating. And comparing the heating performance coefficient EERsys of the central air-conditioning system with a specified value, and judging the level of the energy efficiency parameter.
According to the design standard of public building energy conservation, a specified value of a heating performance coefficient EERsys of the central air-conditioning system is determined, when the heating performance coefficient EERsys of the central air-conditioning system is larger than or equal to the specified value, the energy efficiency level is high, the system is energy-saving, otherwise, the system is not energy-saving.
(2) Refrigeration energy efficiency ratio COPsys of central air-conditioning system
In the formula: COPsys-the refrigeration energy efficiency ratio of the central air conditioning system; QSH-refrigerating capacity of air conditioning unit; sigma Nih-cooling air-time modulator group eliminates power consumption; Σ Njh-the circulating water pump consumes power during refrigeration. And comparing the refrigeration energy efficiency ratio COPsys of the central air-conditioning system with a specified value, and judging the level of the energy efficiency parameter.
According to the design standard of public building energy conservation, a specified value of the refrigeration energy efficiency ratio COPys of the central air-conditioning system is determined, and when the refrigeration energy efficiency ratio COPys of the central air-conditioning system is larger than or equal to the specified value, the energy efficiency level is high, the system is energy-saving, otherwise, the system is not energy-saving.
As shown in tables 5 and 6, the power distribution data acquisition submodule 2 employs two three-phase power acquisition instruments, and three current sensors and three voltage sensors are respectively configured, and each sensor is connected to the three-phase power acquisition instrument by using a signal line. The sensors are arranged at the positions of the distribution main cables of the air source heat pump air conditioning unit and the circulating water pump, the two three-phase electric quantity acquisition instruments can respectively acquire the distribution data of the air conditioning unit and the circulating water pump, and the power consumption of the air conditioning unit and the power consumption of the circulating water pump are obtained through primary processing of original data. The upright tai P666 three-phase electric quantity acquisition instrument that this technical scheme chooseed for use, it has the treater, is equipped with current sensor and voltage sensor, can accomplish electric quantity data's calculation according to its built-in procedure, possesses standard RS485 interface to adopt the same modbus communication protocol, carry out data transmission through signal line and monitoring host computer.
As shown in tables 5 and 6, the user-side data collecting submodule 4 employs a first cold and heat collecting instrument 41 and a second cold and heat collecting instrument 31, both of which are configured with two temperature and one flow sensor, and each sensor is connected to the cold and heat collecting instrument through a signal line. The sensor is arranged on a main pipeline at a user side, the cold and heat quantity acquisition instrument can acquire water inlet and outlet temperature and water flow data passing through, and the refrigerating capacity and the heating capacity of the air source heat pump air conditioning unit are obtained through primary processing of original data. The rainbow OHR-F660 cold and heat quantity acquisition instrument selected by the technical scheme is provided with a 32-bit microprocessor, can complete the calculation of cold (heat) quantity according to a built-in program after being provided with a temperature sensor and a flow sensor, simultaneously has a standard RS485 interface, adopts a modbus communication protocol for communication, and carries out data transmission with a monitoring host through a signal line.
The sensors transmit acquired original data to the data acquisition instrument through signal lines, the data acquisition instrument processes the original data for the first time, transmits the processed data to the monitoring host 1 through the signal lines, and the monitoring host 1 performs secondary processing on the received data, so that energy efficiency parameters are obtained. And judging the energy efficiency level of the central air-conditioning system by comparing the energy efficiency parameter with a specified value, analyzing the influence factors of the running energy consumption of the central air-conditioning system, and formulating energy-saving optimization measures, so that the running energy efficiency level of the central air-conditioning system is improved, and the running cost is reduced.
Optional energy-saving optimization measures include, but are not limited to, optimization of circulating water pumps, optimization of air conditioning units and optimization of auxiliary equipment.
Optimizing a circulating water pump: cleaning a circulating water pump filter to reduce partial local resistance; the water seal, the bearing and the like of the circulating water pump are maintained, so that the circulating water pump is prevented from working with diseases; installing or starting a circulating water pump frequency converter, and adjusting working parameters of the frequency converter according to the load change condition; after the frequency conversion technology is adopted, when the efficiency of the circulating water pump is still low, the high-efficiency circulating water pump matched with the system flow and the lift is replaced.
Optimizing an air conditioning unit: the heat exchanger of the air conditioning unit is cleaned regularly, the scaling of the heat exchanger is removed, and the heat conduction of the heat exchanger is recovered; replacing the aged air conditioning unit with the performance coefficient not meeting the standard; and adding small units when the air conditioning unit is in low-load-rate operation or is frequently started for a long time.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may apply the above-mentioned technical details to other fields by using the equivalent embodiments with equivalent changes, which may be changed or modified by the technical details disclosed in the above description, but any simple modification and equivalent changes made to the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. The energy-saving diagnosis device of the central air-conditioning system comprises a monitoring host and a data acquisition module, and is characterized in that the monitoring host comprises hardware equipment and energy-saving diagnosis software, the energy-saving diagnosis software is designed according to an energy efficiency parameter model, can calculate energy efficiency parameters in real time according to the acquired parameters, and judges the energy efficiency level of the central air-conditioning system through the comparison of the calculated energy efficiency parameters and a specified value;
the data acquisition module comprises a plurality of sub-modules, each sub-module comprises a sensor and a data acquisition instrument, the sensors transmit acquired original data to the data acquisition instruments through signal lines, the data acquisition instruments perform primary processing on the original data and transmit the processed data to the monitoring host through the signal lines, and the monitoring host performs secondary processing on the received data to obtain energy efficiency parameters.
2. The central air-conditioning system energy-saving diagnosis device according to claim 1, wherein the energy efficiency parameter model comprises a heating performance coefficient EERsys model, a cooling energy efficiency ratio COPsys model, a water pump operation efficiency η model and a rock-soil cold-heat imbalance coefficient β model.
3. The central air conditioning system energy saving diagnostic device according to claim 2, wherein the plurality of sub-modules of the data acquisition module comprise a power distribution data acquisition sub-module and a user side data acquisition sub-module.
4. The central air conditioning system energy-saving diagnosis device according to claim 3, wherein the sensors in the distribution data acquisition submodule comprise current sensors and voltage sensors, and the current sensors and the voltage sensors are arranged on distribution cables of the air conditioning unit and the water pump; the data acquisition instrument in the power distribution data acquisition submodule is a three-phase electric quantity acquisition instrument, the input end of the three-phase electric quantity acquisition instrument is connected with a current sensor and a voltage sensor through a signal line, and the output end of the three-phase electric quantity acquisition instrument is connected with a monitoring host through a signal line.
5. The central air conditioning system energy-saving diagnosis device according to claim 3, wherein the sensors in the user side data acquisition submodule comprise a first temperature sensor and a first flow sensor, the first flow sensor is installed on the user side water outlet main pipeline, and the first temperature sensor is installed on the user side water inlet main pipeline and the user side water outlet main pipeline; the data acquisition instrument in the user side data acquisition submodule is a first cold and heat acquisition instrument, the input end of the first cold and heat acquisition instrument is connected with the temperature sensor and the flow sensor through signal lines, and the output end of the first cold and heat acquisition instrument is connected with the monitoring host through signal lines.
6. The central air-conditioning system energy-saving diagnosis device according to claim 3, wherein the data acquisition module further comprises a source side data acquisition submodule, sensors in the source side data acquisition submodule comprise a second temperature sensor and a second flow sensor, the second flow sensor is installed on a cold source side or heat source side heat transfer medium circulation pipeline, and the second temperature sensor is installed at two interfaces of the cold source side or heat source side heat transfer medium circulation pipeline and the heat exchanger; and the data acquisition instrument in the source side data acquisition submodule is a second cold and heat acquisition instrument, the input end of the second cold and heat acquisition instrument is connected with the temperature sensor through a signal line, and the output end of the second cold and heat acquisition instrument is connected with the monitoring host through a signal line.
7. The central air conditioning system energy saving diagnosis device according to claim 1, wherein the hardware devices of the monitoring host comprise a memory, a processor, a display and a communication module.
8. The central air-conditioning system energy-saving diagnosis device according to claim 1, wherein the primary processing of the raw data by the data acquisition instrument is to process the raw data to obtain parameter values for establishing an energy efficiency parameter model.
9. The central air-conditioning system energy-saving diagnosis device according to claim 1, wherein the monitoring host performs secondary processing on the received data by assigning the received data to the energy efficiency parameter model for calculation, and comparing the calculated value with the specified value of the energy efficiency parameter to draw a conclusion.
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