CN116067691A - Portable energy efficiency online detection device and online detection method - Google Patents
Portable energy efficiency online detection device and online detection method Download PDFInfo
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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Abstract
The invention provides a portable energy efficiency online detection device and an online detection method, which are applied to the technical field of central air conditioner detection and comprise an upper computer clamped in a protection box, wherein a mutual inductor, a meter reader, an ultrasonic flowmeter, a temperature and humidity sensor and an ammeter are also arranged in the protection box; the upper computer comprises a shell, an operating platform and a cover plate are arranged on the shell, a display screen is embedded and arranged on the cover plate, and a handle is arranged on the side wall of the cover plate; an upper computer mainboard, a custom controller, a cooling and radiating unit, a wireless communication module, a hard disk storage unit and a power supply conversion module I are arranged in the shell, and an interface board for equipment connection is also embedded and arranged on the shell; the customized controller comprises a singlechip, a second power supply conversion module, a first communication conversion module and a second communication conversion module. The real-time operation energy efficiency detection function aiming at different central air conditioning systems can be realized, and the integrated design is realized, so that the integrated central air conditioning system is ready-to-use and has the advantages of convenient installation and portability.
Description
Technical Field
The invention belongs to the technical field of central air conditioner detection, and particularly relates to a portable energy efficiency online detection device and an online detection method.
Background
The central air conditioning system is composed of one or more cold and heat source systems and a plurality of air conditioning systems, which are different from the conventional refrigerant type air conditioner (such as a single machine, VRV), and intensively process air to achieve comfort requirements. The central air conditioner adopts the liquid gasification refrigeration principle to provide the required cooling capacity for the air conditioning system so as to offset the heat load of the indoor environment; the heating system provides the air conditioning system with the required heat to counteract the indoor ambient cooling load.
In the background of today's increasingly prominent energy and environmental problems, dual carbon targets are identified as one of the important tasks. The heating ventilation air conditioner plays an important role in energy consumption of civil buildings and industrial buildings, and in order to realize energy efficiency improvement and energy-saving operation of the heating ventilation air conditioner system, accurate calculation and prediction are required to be made on the actual operation efficiency and energy-saving space of the heating ventilation system after the operation parameters of the heating ventilation system are acquired in a targeted manner so as to guide the follow-up energy-saving technology to be improved.
At present, a set of building automatic control system or energy-saving control products are installed in a cold and heat source machine room of a central air conditioner for detecting the running energy efficiency of the central air conditioner, however, the building automatic control system and the energy-saving control products basically belong to island systems, and software and hardware are customized products and are not detachable and movable, so that the detection method is not applicable to detection of other central air conditioning equipment.
In addition, when the existing building automatic control system or energy-saving control product calculates the running energy efficiency ratio of the central air conditioner, various sensors are required to be installed on the holes of the pipelines to acquire related parameters, the central air conditioner system is required to be stopped, the water draining side can perform pipeline hole opening and welding operation, and certain limitation is caused on certain places which cannot be stopped.
Therefore, it is necessary to design a device for detecting the energy efficiency of the heating ventilation air conditioning system, which is convenient to install, use and carry and can be suitable for various project conditions.
Disclosure of Invention
In view of the above problems in the prior art, the present invention aims to provide a portable energy efficiency online detection device, which can realize the function of detecting the real-time operation energy efficiency of different central air conditioning systems, and has the advantages of convenient installation and portability by integrating design, i.e. instant assembly.
The portable energy efficiency online detection device comprises an upper computer, wherein the upper computer is connected in a protection box in a clamping mode, and a transformer for collecting the electricity consumption of a water chilling unit, a circulating pump and a cooling tower fan, a meter reader for reading ammeter data, an ultrasonic flowmeter and a temperature and humidity sensor for collecting the circulation of chilled water and an ammeter are further arranged in the protection box;
the upper computer comprises a shell, an operation table is arranged on the shell, one side of the shell is connected with a cover plate, a display screen matched with the operation table is embedded and arranged on the cover plate, and a handle is arranged on the side wall of the cover plate;
an upper computer mainboard, a custom controller, a cooling and radiating unit, a wireless communication module, a hard disk storage unit and a first power supply conversion module are arranged in the shell, and an interface board for equipment connection is also embedded and arranged on the shell;
the customized controller comprises a singlechip for master control, a second power conversion module for regulating voltage and a third power conversion module for communication transmissionA first communication conversion module and a second communication conversion module; the customized controller is used for calculating the real-time refrigerating capacity Q of the central air conditioning system Cold water Collecting power consumption P of running of water chilling unit, circulating pump and cooling tower fan Total (S) Calculating the real-time operation energy efficiency ratio COP of a central air conditioning system Is tied to reality Calculating the real-time operation energy efficiency ratio COP of the water chilling unit Machine tool Energy-saving rate r of water chilling unit is predicted Machine for making food Energy saving W Machine for making food Predicting energy saving rate r of circulating pump Pump with a pump body Energy saving W Pump with a pump body And comparing the energy efficiency ratio of the water chilling unit and the central air conditioning system, judging the energy efficiency ratio level, and calculating the carbon emission data which can be reduced by energy conservation transformation.
In order to protect the upper computer from being damaged by external force, the protection box is provided with a box cover, the box cover is provided with a protection pad for protecting the upper computer, and the protection box and the box cover are respectively provided with a lock catch which are matched with each other.
For the inside storage space of rational distribution guard box, the setting element that is used for joint host computer is installed to the inner wall of guard box, the interior wall avris of setting element is installed and is used for the strip of accepting the host computer, the inside of setting element still is equipped with the dividing strip, dividing strip divides into the storage room that is used for depositing mutual-inductor, meter reading ware, ultrasonic flowmeter, temperature and humidity sensor and ammeter with the inner space of setting element.
In order to improve the use convenience of acquisition equipment, the mutual inductor is open-type current transformer, the meter reader is wireless meter reader, the ammeter is wireless smart ammeter, the ultrasonic flowmeter is wireless external clamp type ultrasonic flowmeter, ultrasonic flowmeter includes upstream sensor probe and low reaches sensor probe.
In order to facilitate equipment connection, a power port, an RS485 port, an RJ45 port and a wireless antenna interface are arranged on the interface board.
In order to realize wireless transmission, the wireless communication module is respectively in communication connection with the customized controller, the meter reader, the ammeter and the ultrasonic flowmeter.
In a second aspect of the present invention, an online detection method is further provided, and the portable energy efficiency online detection device is used for online detection, where the detection method includes the following steps:
s1, calculating real-time refrigerating capacity Q of central air conditioning system Cold water The method comprises the steps of carrying out a first treatment on the surface of the The method specifically comprises the following steps: collecting and calculating the real-time temperature of circulating water of a central air conditioning system, calculating the temperature difference of inlet water and outlet water, collecting the flow M of the circulating water, and then passing through a thermodynamic formula Q Cold water ＝C×M×(T Feeding in -T Out of ) Calculating the refrigerating capacity value Q of the real-time operation of the central air conditioner Cold water The method comprises the steps of carrying out a first treatment on the surface of the The acquisition and calculation process of the real-time temperature of the circulating water of the central air conditioning system is as follows: the temperature of the chilled water supply and return water main pipe is represented by collecting the temperature of the side water inlet and outlet water of the evaporator from the water chilling unit through a temperature and humidity sensor, so that the temperature difference of the inlet water and the outlet water is calculated;
s2, collecting power consumption P of running of a water chilling unit, a circulating pump and a cooling tower fan through an ammeter or a meter reader Total (S) ；
S3, calculating the real-time operation energy efficiency ratio COP of the central air conditioning system Is tied to reality Wherein, COP Is tied to reality ＝Q Cold water ÷P Total (S) ；
S4, calculating the real-time operation energy efficiency ratio COP of the water chilling unit Machine tool Wherein, COP Machine tool ＝Q Cold water ÷P Machine for making food ，P Machine for making food The power consumption for the running of the water chilling unit;
s5, predicting energy saving rate r of water chilling unit Machine for making food Energy saving W Machine for making food ；
S6, predicting the energy saving rate r of the circulating pump Pump with a pump body Energy saving W Pump with a pump body ；
S7, comparing the energy efficiency ratio of the water chilling unit and the central air conditioning system, judging the energy efficiency ratio level, and calculating the carbon emission data which can be reduced by energy conservation transformation.
The collection process of the flow M of the circulating water is as follows: if the circulating pump is not provided with a frequency converter, the circulating quantity of the frozen water is measured by an ultrasonic flow meter; if the circulating pump is provided with the frequency converter, the flow M of the circulating water is automatically calculated according to the water pump similarity law.
Energy saving rate r of water chilling unit Machine for making food ≈{1-(COP Machine tool ÷COP Forehead machine ) } X100%, where COP Machine tool ＝Q Cold consolidation ÷P Machine tool ，COP Forehead machine ＝Q Cold forehead ÷P Forehead machine ，Q Cold consolidation Is the actual refrigerating capacity and P of the water chilling unit under the partial load state Machine tool Is the actual power consumption and Q of the water chilling unit under the partial load state Cold forehead Is the rated refrigerating capacity and P of the water chilling unit under the rated working condition Forehead machine The rated power consumption of the water chilling unit under the rated working condition;
energy-saving W of water chilling unit Machine for making food The calculation formula of (2) is as follows:
wherein ,WMachine n For the power consumption and r of the nth group of water chilling units at a certain moment Machine n The energy saving rate of the nth group of water chilling units at a certain moment;
the energy saving rate r of the circulating pump is calculated Pump with a pump body The process of (2) is as follows: according to the refrigerating capacity value Q of the real-time operation of the central air conditioner Cold water Determining the real-time refrigerating capacity of the water chilling unit, adjusting the water inlet and outlet temperature difference to be the rated working condition temperature difference delta T1, and predicting the circulating water flow
Calculating the energy saving rate r of the circulating pump according to the relation of the flow, the power and the rotating speed of the circulating pump according to the similarity law of the flow and the power of the circulating pump Pump with a pump body Energy saving rate r of circulating pump Pump with a pump body The calculation formula of (2) is as follows: />
wherein ,
M 1 to adjust the predicted circulating water flow after the temperature difference, and
n is the rated rotation speed of the circulating pump, n 1 The corresponding rotating speed after the flow is regulated for the circulating pump, and P is the rated power and P of the circulating pump 1 To adjust the predicted power after the temperature difference;
energy saving W of the circulating pump Pump with a pump body The calculation formula of (2) is as follows:
wherein ,WPump n For the power consumption of the nth group circulation pump at a certain moment, r Pump n The energy saving rate of the nth group of circulating pumps at a certain moment.
The beneficial effects of the invention are as follows: the portable energy efficiency on-line detection device and the on-line detection method are characterized in that an upper computer main board and a custom controller are installed in a movable shell, an upper computer is constructed through a box body structure, information interaction is realized through a wireless communication module and a connecting port on an interface board, an on-line detection function is realized, an integrated structure is adopted, and all acquisition devices are integrated in a protection box, so that the portable energy efficiency on-line detection device is convenient to carry, and can be suitable for real-time operation energy efficiency detection of central air conditioning systems in different scenes, namely, the portable energy efficiency on-line detection device is used immediately after being installed, and the defects of building automatic control systems can be effectively avoided.
Corresponding data information in the central air conditioning system is acquired in real time through the mutual inductor, the meter reader, the ultrasonic flowmeter, the temperature and humidity sensor and the ammeter, and after the custom controller receives data by means of information transmission of the wireless communication module, the data can be filtered, counted and calculated, calculation results are analyzed and inferred, real-time monitoring of the running state of the central air conditioning system is achieved, and energy saving rate and energy saving energy of equipment such as a water chilling unit and a circulating pump can be predicted.
The chilled water supply and return water main pipe water temperature is represented by collecting the water chiller evaporator side return water temperature, the cooling water circulation quantity is collected by adopting the wireless external clamp type ultrasonic flowmeter, the pipe breaking and water drainage installation are not needed, and the water chiller evaporator side return water temperature is only needed to be installed on the outer wall of a pipeline, so that required data can be quickly and conveniently collected.
The open type current transformer is adopted to collect electricity consumption of equipment such as a water chilling unit, a circulating pump and a cooling tower fan, the installation mode of the conventional perforated type current transformer is abandoned, the open type current transformer is not required to be powered off, the installation process is simple and convenient, the on-line installation can be realized, and the normal operation of the collected equipment can not be influenced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of an internal module of a host computer according to the present invention;
FIG. 2 is a schematic diagram of the internal modules of the custom controller of the present invention;
FIG. 3 is a schematic view of the structure of the protection box of the present invention;
FIG. 4 is a schematic view of the structure of the inside of the protective case of the present invention;
FIG. 5 is a schematic diagram of the upper computer according to the present invention;
FIG. 6 is a schematic diagram of the structure of an interface board of the present invention;
FIG. 7 is a flow chart of the online detection method of the present invention.
Marked in the figure as: 1. a protection box; 2. locking; 3. an upper computer; 301. a housing; 302. a cover plate; 303. a handle; 304. a display screen; 305. an operation table; 306. a power port; 307. an RS485 port; 308. an RJ45 port; 309. a wireless antenna interface; 4. a positioning piece; 5. a case cover; 6. a protective pad; 7. a receiving bar; 8. a dividing strip.
Detailed Description
Example 1
As shown in FIG. 1, the portable energy efficiency on-line detection device comprises an upper computer 3, wherein the upper computer 3 is connected with the inside of a protection box 1 in a clamping mode, a box cover 5 is arranged on the protection box 1, a protection pad 6 for protecting the upper computer 3 is arranged on the box cover 5, the protection pad 6 can be made of foam, rubber and other materials, and lock catches 2 matched with each other are respectively arranged on the protection box 1 and the box cover 5.
The inside of the protection box 1 is also provided with a mutual inductor for collecting the electricity consumption of the water chilling unit, the circulating pump and the cooling tower fan, a meter reader for reading the data of the ammeter, an ultrasonic flowmeter for collecting the circulation of chilled water, a temperature and humidity sensor and the ammeter.
The transformer is an open type current transformer, the meter reader is a wireless meter reader, the ammeter is a wireless intelligent ammeter, and the ultrasonic flowmeter is a wireless external clamp type ultrasonic flowmeter.
The main power supply of the power distribution control cabinet is required to be disconnected when the traditional current transformer is installed, the normal operation of equipment is influenced when the traditional current transformer is installed, the open type current transformer is not required to be powered off when the open type current transformer is installed, the live operation is realized, the normal operation of the equipment is not influenced, and the installation is convenient and fast.
The wireless intelligent ammeter does not need to be connected with a communication line, adopts a wireless transmission mode to carry out data communication with the custom controller, saves the economic cost of paving the communication line, and also reduces the construction difficulty. For the project with the electric meter installed, the wireless meter reader can be used for shooting and grabbing the electric meter reading, and the mode is the prior art and is not described in detail herein.
The device can collect the temperature of the chilled water supply and return water main pipe, the traditional detection device carries out water temperature detection by installing an immersed water pipe temperature sensor through a broken pipe, and the detection device adopts a mode of communicating with a water chilling unit, analyzes the temperature of water coming from the side of an evaporator of the water chilling unit and obtains the temperature of the chilled water supply and return water main pipe.
Among the temperatures of the chilled water supply and return water main pipes, the temperature of the water supply and return water main pipe is the water outlet temperature of the water chilling unit, the return water main pipe is the mixed temperature, and the return water temperatures of the evaporators connected with the water chilling units in parallel are the return water at the same return water main pipe, so that the return water temperatures at the sides of the evaporators of the water chilling unit are also the temperatures of the chilled water return water main pipe, the water temperatures of the chilled water supply and return water main pipes can be represented by the temperatures of the side outlet water of the evaporators obtained from the water chilling unit through the temperature and humidity sensor, and the water supply and return water main pipe is simple and convenient in obtaining mode and easy to operate.
In addition, the frozen water circulation quantity is collected through the wireless external clamp type ultrasonic flowmeter which can be installed on the outer wall of the pipeline without pipe breaking and water draining, wherein the wireless external clamp type ultrasonic flowmeter comprises an upstream sensor probe and a downstream sensor probe, and the upstream sensor probe and the downstream sensor probe are respectively installed at the upstream position and the downstream position of the frozen water return pipeline in the water flow direction.
As shown in fig. 2, the inner wall of the protection box 1 is provided with a positioning piece 4 for clamping the upper computer 3, the positioning piece 4 is provided with a clamping groove which is the same as the upper computer 3 in appearance and is used for positioning and protecting the upper computer 3, collision caused by displacement of the upper computer 3 is avoided, the side of the inner wall of the positioning piece 4 is provided with a bearing strip 7 for bearing the upper computer 3, the bearing strip 7 is used for providing supporting force for the upper computer 3, meanwhile, the inner space of the positioning piece 4 can be divided into an upper layer and a lower layer, the use of the lower layer is facilitated, the inside of the positioning piece 4 is also provided with a separation strip 8, the separation strip 8 separates the inner space of the positioning piece 4 into a storage chamber for storing a mutual inductor, a meter, an ultrasonic flowmeter, a temperature and humidity sensor and an ammeter, the position of the separation strip 8 can be designed according to use requirements, the separation strip 8 and the positioning piece 4 can adopt materials such as foam and rubber and the like for protecting devices.
As shown in fig. 3, the upper computer 3 includes a housing 301, an operation console 305 is mounted on the housing 301, a cover plate 302 is connected to one side of the housing 301, a display screen 304 that is mutually matched with the operation console 305 is embedded and mounted on the cover plate 302, the cover plate 302 and the housing 301 form a structure like a notebook computer, a clamping block that is mutually matched can be mounted between the cover plate 302 and the housing 301, connection tightness between the cover plate 302 and the housing 301 is improved, and a handle 303 is arranged on a side wall of the cover plate 302.
As shown in fig. 4, an upper computer motherboard, a custom controller, a cooling and radiating unit, a wireless communication module, a hard disk storage unit and a first power supply conversion module are arranged in the shell 301, and the wireless communication module is respectively in communication connection with the custom controller, the meter reader, the ammeter and the ultrasonic flowmeter. The interface board for equipment connection is further embedded and installed on the shell 301, a power supply port 306, an RS485 port 307, an RJ45 port 308 and a wireless antenna interface 309 are arranged on the interface board, the interface board can connect internal equipment of the upper computer 3 with external equipment, data transmission is achieved, and wiring requirements of different equipment can be met through different wiring ports.
As shown in fig. 5, the custom controller includes a single chip microcomputer for master control, a second power conversion module for voltage regulation, a first communication conversion module for communication transmission, and a second communication conversion module, where the two communication transmission conversion modules are used for sharing the working pressure of communication conversion.
The customized controller is used for analyzing the water chilling unit communication protocol, analyzing the frequency converter communication protocol, analyzing the wireless intelligent ammeter communication protocol and analyzing the ultrasonic flowmeter protocol; the customized controller collects data information collected by each sensor device through the wireless communication module, filters, counts and calculates the data information, realizes the real-time monitoring of the running state of the central air conditioning system, predicts the energy saving rate and the energy saving quantity of the central air conditioning system, reduces the carbon emission and other data through comparing the calculation result with the international standard index, and is beneficial to the detection personnel to know the performance of the detected central air conditioning system.
When the portable energy efficiency on-line detection device is used, the following steps are needed:
1. the portable energy efficiency on-line detection device is deployed:
the detection device is placed at a proper position (a dry and cool place far away from air conditioning equipment and a water pipe), a working power supply is connected through a power port 306, then a protection box 1 is opened, equipment such as an upper computer 3, an open type current transformer, a wireless meter reader, a wireless external clamp type ultrasonic flowmeter and the like is taken out according to the actual condition of the site, and parameters such as an ammeter communication address, a flowmeter communication address, a chiller communication address and the like are set through the upper computer 3.
2. Installing a wireless meter reader or an open type current transformer:
(1) If the device to be detected is provided with the ammeter, the information of the existing ammeter is read through the wireless ammeter reader.
(2) If the electric meter is not installed on the equipment to be detected, in order to ensure that the normal operation of the equipment is not affected, wiring is installed under the condition of no power failure through an opening type current transformer, and corresponding parameters such as transformer transformation ratio, three-phase balanced load, communication address and the like are set after wiring is completed.
3. Installing a wireless external clamp type ultrasonic flowmeter or connecting a communication line of a frequency converter:
(1) If the frequency converter is not installed in the distribution control cabinet of the chilled water circulating pump, the wireless external clamp type ultrasonic flowmeter needs to be installed on the chilled water return main pipe, and the installation requirement of manufacturers of the wireless external clamp type ultrasonic flowmeter is met during installation.
After the installation position is determined, removing the pipeline heat insulation material of the original chilled water return water main pipe, and setting relevant parameters of the flowmeter, wherein the parameters comprise: the method comprises the steps of removing a pipeline paint brushing part at a mounting point by sand paper until a metal part is exposed, adhering and fixing an upstream sensor probe and a downstream sensor probe on the outer wall of a pipeline, fixing the upstream sensor probe and the downstream sensor probe again by using a metal hoop, preventing the probe from shifting due to vibration of the pipeline, and setting a communication address of a flowmeter after the installation is finished.
(2) If the power distribution control cabinet of the chilled water circulating pump is provided with a frequency converter, connecting a communication line of the frequency converter, and calculating the actual circulating quantity of chilled water under the frequency conversion working condition by utilizing the similarity law of a water pump.
The specific connection mode is as follows: opening a circulating pump power distribution control cabinet, and finding an RS485 communication port or an RJ45 communication port of the frequency converter; the communication wiring ports are connected to the wiring ports corresponding to the custom controller through temporary communication lines RVSP2X1.0 or network lines on the frequency converters in the power distribution control cabinet.
4. And (3) connecting a water chilling unit communication line:
and opening a control box of the water chilling unit, finding a communication wiring port, and connecting the water chilling unit communication wiring port to an RS485 port corresponding to the custom controller by using a temporary communication line RVSP2X1.0 in the control box.
5. Setting related parameters of a test object:
the upper computer 3 inputs the relevant parameter information of the test object into the detection system of the customized controller, and the online detection can be performed after the input is completed. Wherein the relevant parameters of the test object include: the system comprises a central air conditioning system type, an operation mode, the number of water chilling units, the rated refrigerating capacity of a single water chilling unit, the rated input power of a single water chilling unit, the number of chilled water circulation pumps, the rated flow of a single chilled water circulation pump, the rated lift of a single chilled water circulation pump, the number of cooling water circulation pumps, the rated flow of a single cooling water circulation pump, the rated lift of a single cooling water circulation pump, the number of cooling tower fans, the rated power of a single cooling tower fan, a power consumption reading mode and a flow acquisition mode.
Example two
As shown in fig. 7, in a second aspect of the present invention, an online detection method is further provided, and the online detection is performed by using the portable energy efficiency online detection device, where the detection method includes the following steps:
s1, calculating real-time refrigerating capacity Q of central air conditioning system Cold water The method comprises the steps of carrying out a first treatment on the surface of the The method specifically comprises the following steps: collecting and calculating the real-time temperature of circulating water of a central air conditioning system, calculating the temperature difference of inlet water and outlet water, collecting the flow M of the circulating water, and then passing through a thermodynamic formula Q Cold water ＝C×M×(T Feeding in -T Out of ) Calculating the refrigerating capacity value Q of the real-time operation of the central air conditioner Cold water The method comprises the steps of carrying out a first treatment on the surface of the The acquisition and calculation process of the real-time temperature of the circulating water of the central air conditioning system is as follows: the temperature of the chilled water supply and return water main pipe is represented by collecting the temperature of the side water inlet and outlet water of the evaporator from the water chilling unit through a temperature and humidity sensor, so that the temperature difference of the inlet water and the outlet water is calculated;
s2, collecting power consumption P of running of a water chilling unit, a circulating pump and a cooling tower fan through an ammeter or a meter reader Total (S) ；
S3, calculating the real-time operation energy efficiency ratio COP of the central air conditioning system Is tied to reality Wherein, COP Is tied to reality ＝Q Cold water ÷P Total (S) ；
S4, meterCalculating the real-time operation energy efficiency ratio COP of the water chilling unit Machine tool Wherein, COP Machine tool ＝Q Cold water ÷P Machine for making food ，P Machine for making food The power consumption for the running of the water chilling unit;
s5, predicting energy saving rate r of water chilling unit Machine for making food Energy saving W Machine for making food ；
S6, predicting the energy saving rate r of the circulating pump Pump with a pump body Energy saving W Pump with a pump body ；
S7, comparing the energy efficiency ratio of the water chilling unit and the central air conditioning system, judging the energy efficiency ratio level, and calculating the carbon emission data which can be reduced by energy conservation transformation.
The collection process of the flow M of the circulating water is as follows: if the circulating pump is not provided with a frequency converter, the circulating quantity of the frozen water is measured by an ultrasonic flow meter; if the circulating pump is provided with the frequency converter, the flow M of the circulating water is automatically calculated according to the water pump similarity law.
Energy saving rate r of water chilling unit Machine for making food ≈{1-(COP Machine tool ÷COP Forehead machine ) } X100%, where COP Machine tool ＝Q Cold consolidation ÷P Machine tool ，COP Forehead machine ＝Q Cold forehead ÷P Forehead machine ，Q Cold consolidation Is the actual refrigerating capacity and P of the water chilling unit under the partial load state Machine tool Is the actual power consumption and Q of the water chilling unit under the partial load state Cold forehead Is the rated refrigerating capacity and P of the water chilling unit under the rated working condition Forehead machine The rated power consumption of the water chilling unit under the rated working condition;
energy-saving W of water chilling unit Machine for making food The calculation formula of (2) is as follows:
wherein ,WMachine n For the power consumption and r of the nth group of water chilling units at a certain moment Machine n The energy saving rate of the nth group of water chilling units at a certain moment;
the energy saving rate r of the circulating pump is calculated Pump with a pump body The process of (2) is as follows: according to the real-time operation of the central air conditionerIs the refrigerating capacity value Q of (2) Cold water Determining the real-time refrigerating capacity of the water chilling unit, adjusting the water inlet and outlet temperature difference to be the rated working condition temperature difference delta T1, and predicting the circulating water flow
Calculating the energy saving rate r of the circulating pump according to the relation of the flow, the power and the rotating speed of the circulating pump according to the similarity law of the flow and the power of the circulating pump Pump with a pump body Energy saving rate r of circulating pump Pump with a pump body The calculation formula of (2) is as follows: />
wherein ,
M 1 to adjust the predicted circulating water flow after the temperature difference, and
n is the rated rotation speed of the circulating pump, n 1 The corresponding rotating speed after the flow is regulated for the circulating pump, and P is the rated power and P of the circulating pump 1 To adjust the predicted power after the temperature difference;
energy saving W of the circulating pump Pump with a pump body The calculation formula of (2) is as follows:
wherein ,WPump n For the power consumption of the nth group circulation pump at a certain moment, r Pump n The energy saving rate of the nth group of circulating pumps at a certain moment.
Specifically, the customized controller is used for comparing the energy efficiency ratio of the water chilling unit and the central air conditioning system and judging the energy efficiency ratio level, and the process is as follows: according to the calculation, the real-time operation efficiency of the water chilling unit and the real-time operation energy efficiency ratio of the central air conditioning system can be obtained, the calculation result is compared with the national relevant standard, the energy efficiency ratio level of the water chilling unit and the energy efficiency grade of the central air conditioning system are obtained, the central air conditioning manager can grasp the operation condition of the central air conditioning system more clearly, and data support is provided for later energy saving transformation. The national standard judging water chilling unit and the system energy efficiency ratio value reference table are as follows:
table 1-1 table for comparing coefficient of performance and energy efficiency level of water chiller
Table 1-2 comparison table of energy efficiency ratio grade of cold source system
Specifically, the custom controller is used for calculating the carbon emission data that energy saving transformation can reduce: the process is as follows: according to the total energy saving amount of the central air conditioning system and the carbon emission value of 1-degree electricity reduction of national standard which are calculated by prediction in the "energy saving rate and energy saving amount of the water chilling unit" and the "energy saving rate and energy saving amount of the circulating pump", the carbon emission reduction value which can be realized after energy saving transformation is calculated, namely, the sum of the energy saving amount of the water chilling unit and the energy saving amount of the circulating pump is multiplied by the carbon emission value of 1-degree electricity reduction of national standard, and specifically, the carbon emission can be reduced by 0.785Kg by saving 1kWh electricity.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The portable energy efficiency online detection device is characterized by comprising an upper computer (3), wherein the upper computer (3) is clamped in a protection box (1), and a transformer for collecting the electricity consumption of a water chilling unit, a circulating pump and a cooling tower fan, a meter reader for reading ammeter data, an ultrasonic flowmeter and a temperature and humidity sensor for collecting the circulation of chilled water and an ammeter are also arranged in the protection box (1);
the upper computer (3) comprises a shell (301), an operation table (305) is installed on the shell (301), a cover plate (302) is connected to one side of the shell (301), a display screen (304) matched with the operation table (305) is embedded and installed on the cover plate (302), and a handle (303) is arranged on the side wall of the cover plate (302);
an upper computer mainboard, a custom controller, a cooling and radiating unit, a wireless communication module, a hard disk storage unit and a first power supply conversion module are arranged in the shell (301), and an interface board for equipment connection is also embedded and arranged on the shell (301);
the customized controller comprises a singlechip for master control, a power supply conversion module II for regulating voltage, a communication conversion module I for communication transmission and a communication conversion module II;
the customized controller is used for calculating the real-time refrigerating capacity Q of the central air conditioning system Cold water Collecting power consumption P of running of water chilling unit, circulating pump and cooling tower fan Total (S) Calculating the real-time operation energy efficiency ratio COP of a central air conditioning system Is tied to reality Calculating the real-time operation energy efficiency ratio COP of the water chilling unit Machine tool Energy-saving rate r of water chilling unit is predicted Machine for making food Energy saving W Machine for making food Predicting energy saving rate r of circulating pump Pump with a pump body Energy saving W Pump with a pump body And comparing the energy efficiency ratio of the water chilling unit and the central air conditioning system, judging the energy efficiency ratio level, and calculating the carbon emission data which can be reduced by energy conservation transformation.
2. The portable energy efficiency online detection device according to claim 1, wherein a case cover (5) is installed on the protection case (1), a protection pad (6) for protecting the upper computer (3) is installed on the case cover (5), and lock catches (2) matched with each other are respectively installed on the protection case (1) and the case cover (5).
3. The portable energy efficiency online detection device according to claim 1, wherein a positioning piece (4) for clamping an upper computer (3) is installed on the inner wall of the protection box (1), a receiving strip (7) for receiving the upper computer (3) is installed on the side of the inner wall of the positioning piece (4), a separation strip (8) is further arranged in the positioning piece (4), and the separation strip (8) separates the inner space of the positioning piece (4) into a storage chamber for storing a mutual inductor, a meter reader, an ultrasonic flowmeter, a temperature and humidity sensor and an ammeter.
4. The portable energy efficiency online detection device of claim 1, wherein the transformer is an open-type current transformer, the meter reader is a wireless meter reader, the meter is a wireless smart meter, the ultrasonic flowmeter is a wireless external clamp type ultrasonic flowmeter, and the ultrasonic flowmeter comprises an upstream sensor probe and a downstream sensor probe.
5. The portable energy efficiency online detection device of claim 1, wherein the interface board is provided with a power port (306), an RS485 port (307), an RJ45 port (308), and a wireless antenna interface (309).
6. The portable energy efficiency online detection device of claim 1, wherein the wireless communication module is communicatively coupled to a custom controller, a meter reader, an electricity meter, and an ultrasonic flow meter, respectively.
7. An on-line detection method, characterized in that the portable energy efficiency on-line detection device according to any one of claims 1 to 6 is used for on-line detection, the detection method comprising the steps of:
s1, calculating real-time refrigerating capacity Q of central air conditioning system Cold water The method comprises the steps of carrying out a first treatment on the surface of the The method specifically comprises the following steps: collecting and calculating the real-time temperature of circulating water of a central air conditioning system, calculating the temperature difference of inlet water and outlet water, collecting the flow M of the circulating water, and then passing through a thermodynamic formula Q Cold water ＝C×M×(T Feeding in -T Out of ) Calculating the refrigerating capacity value Q of the real-time operation of the central air conditioner Cold water The method comprises the steps of carrying out a first treatment on the surface of the The acquisition and calculation process of the real-time temperature of the circulating water of the central air conditioning system is as follows: the temperature of the chilled water supply and return water main pipe is represented by collecting the temperature of the side water inlet and outlet water of the evaporator from the water chilling unit through a temperature and humidity sensor, so that the temperature difference of the inlet water and the outlet water is calculated;
s2, collecting power consumption P of running of a water chilling unit, a circulating pump and a cooling tower fan through an ammeter or a meter reader Total (S) ；
S3, calculating the real-time operation energy efficiency ratio COP of the central air conditioning system Is tied to reality Wherein, COP Is tied to reality ＝Q Cold water ÷P Total (S) ；
S4, calculating the real-time operation energy efficiency ratio COP of the water chilling unit Machine tool Wherein, COP Machine tool ＝Q Cold water ÷P Machine for making food ，P Machine for making food The power consumption for the running of the water chilling unit;
s5, predicting energy saving rate r of water chilling unit Machine for making food Energy saving W Machine for making food ；
S6, predicting the energy saving rate r of the circulating pump Pump with a pump body Energy saving W Pump with a pump body ；
S7, comparing the energy efficiency ratio of the water chilling unit and the central air conditioning system, judging the energy efficiency ratio level, and calculating the carbon emission data which can be reduced by energy conservation transformation.
8. The online detection method according to claim 7, wherein the flow rate M of the circulating water is collected as follows: if the circulating pump is not provided with a frequency converter, the circulating quantity of the frozen water is measured by an ultrasonic flow meter; if the circulating pump is provided with the frequency converter, the flow M of the circulating water is automatically calculated according to the water pump similarity law.
9. The online detection method of claim 7, wherein the energy saving rate r of the water chiller is Machine for making food ≈{1-(COP Machine tool ÷COP Forehead machine ) } X100%, where COP Machine tool ＝Q Cold consolidation ÷P Machine tool ，COP Forehead machine ＝Q Cold forehead ÷P Forehead machine ，Q Cold consolidation Is the actual refrigerating capacity and P of the water chilling unit under the partial load state Machine tool Is the actual power consumption and Q of the water chilling unit under the partial load state Cold forehead Is the rated refrigerating capacity and P of the water chilling unit under the rated working condition Forehead machine The rated power consumption of the water chilling unit under the rated working condition;
energy-saving W of water chilling unit Machine for making food The calculation formula of (2) is as follows:
wherein ,WMachine n For the power consumption and r of the nth group of water chilling units at a certain moment Machine n The energy saving rate of the nth group of water chilling units at a certain moment;
the energy saving rate r of the circulating pump is calculated Pump with a pump body The process of (2) is as follows: according to the refrigerating capacity value Q of the real-time operation of the central air conditioner Cold water Determining the real-time refrigerating capacity of the water chilling unit, adjusting the water inlet and outlet temperature difference to be the rated working condition temperature difference delta T1, and predicting the circulating water flow
Calculating the energy saving rate r of the circulating pump according to the relation of the flow, the power and the rotating speed of the circulating pump according to the similarity law of the flow and the power of the circulating pump Pump with a pump body Energy saving rate r of circulating pump Pump with a pump body The calculation formula of (2) is as follows: />
wherein ,
M 1 to adjust the predicted circulating water flow after the temperature difference, and
n is the rated rotation speed of the circulating pump, n 1 The corresponding rotating speed after the flow is regulated for the circulating pump, and P is the rated power and P of the circulating pump 1 To adjust the predicted power after the temperature difference;
energy saving W of the circulating pump Pump with a pump body The calculation formula of (2) is as follows:
wherein ,WPump n For the power consumption of the nth group circulation pump at a certain moment, r Pump n The energy saving rate of the nth group of circulating pumps at a certain moment. />
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