A portable on-line energy efficiency detection device and on-line detection method

Abstract

The present invention provides a portable on-line energy efficiency detection device and an on-line detection method, which are applied to the technical field of central air-conditioning detection. The device includes a host computer clamped inside a protection box. Inside the protection box, there are also arranged an instrument transformer, a meter reader, an ultrasonic flowmeter, a temperature and humidity sensor, and an electric meter. The host computer includes a housing, on which an operation console and a cover plate are installed. A display screen is embedded in the cover plate, and a handle is arranged on the side wall of the cover plate. Inside the housing, there are installed a host computer main board, a customized controller, a cooling and heat dissipation unit, a wireless communication module, a hard disk storage unit, and a power conversion module I. An interface board for device connection is also embedded on the housing. The customized controller includes a single-chip microcomputer, a power conversion module II, a communication conversion module I, and a communication conversion module II. It can realize the real-time operation energy efficiency detection function for different central air-conditioning systems, and through the integrated design, it can be installed and used immediately, having the advantages of convenient installation and carrying.

Description

Technical Field

[0001] The invention belongs to the technical field of central air-conditioning detection, and in particular relates to a portable energy efficiency online detection device and an online detection method. Background Art

[0002] The central air conditioning system consists of one or more cold and heat source systems and multiple air conditioning systems. This system is different from traditional refrigerant air conditioners (such as single units, VRV) and centrally processes air to achieve comfort requirements. Central air conditioning uses the principle of liquid vaporization refrigeration to provide the required cooling capacity for the air conditioning system to offset the heat load of the indoor environment; the heating system provides the required heat for the air conditioning system to offset the cooling load of the indoor environment.

[0003] In the context of increasingly prominent energy and environmental issues, the dual carbon goal has been identified as one of the key tasks. HVAC plays an important role in the energy consumption of both civil and industrial buildings. To achieve energy efficiency improvement and energy-saving operation of HVAC systems, it is necessary to obtain the operating parameters of the HVAC system in a targeted manner, and then make accurate calculations and predictions on the actual operating efficiency and energy-saving space of the HVAC system to guide the subsequent implementation of energy-saving technical reforms.

[0004] At present, the detection of central air-conditioning energy efficiency mostly adopts the method of installing a building automatic control system or energy-saving control product in the central air-conditioning cold and heat source room. However, the above-mentioned building automatic control system and energy-saving control product are basically isolated systems, and the software and hardware are customized products. They are not removable and cannot be moved, and are not suitable for the detection of other central air-conditioning equipment.

[0005] Moreover, when calculating the energy efficiency ratio of central air-conditioning, existing building automatic control systems or energy-saving control products need to drill holes in the pipes and install various sensors to collect relevant parameters. The central air-conditioning system needs to be shut down and drained before the pipe drilling and welding operations can be carried out, which has certain limitations for some occasions where the system cannot be shut down.

[0006] Therefore, it is necessary to design a device for energy efficiency testing of HVAC systems that is easy to install, easy to use, easy to carry, and can be applied to a variety of project situations. Summary of the invention

[0007] In view of the above problems in the prior art, the purpose of the present invention is to provide a portable online energy efficiency detection device, which can realize real-time operation energy efficiency detection function for different central air-conditioning systems, and through integrated design, it can be installed and used, and has the advantages of easy installation and carrying.

[0008] A portable on-line energy efficiency detection device, including a host computer, which is clamped inside a protection box. Inside the protection box, there are also installed a transformer for collecting the electricity consumption of the chiller, circulation pump and cooling tower fan, a meter reader for reading the electricity meter data, an ultrasonic flowmeter for collecting the chilled water circulation volume, a temperature and humidity sensor, and an electricity meter.

[0009] The host computer includes a housing, on which an operation console is installed. One side of the housing is connected with a cover plate, on which a display screen cooperating with the operation console is embedded, and a handle is provided on the side wall of the cover plate.

[0010] Inside the housing, there are installed a host computer motherboard, a customized controller, a cooling and heat dissipation unit, a wireless communication module, a hard disk storage unit and a power conversion module I. On the housing, there is also inlaid an interface board for device connection.

[0011] The customized controller includes a single-chip microcomputer for main control, a power conversion module II for voltage regulation, a communication conversion module I and a communication conversion module II for communication transmission. The customized controller is used to calculate the real-time cooling capacity Q of the central air-conditioning system 冷 , collect the power consumption P of the chiller, circulation pump and cooling tower fan during operation 总 , calculate the real-time operating energy efficiency ratio COP of the central air-conditioning system 系实 , calculate the real-time operating energy efficiency ratio COP of the chiller 机实 , predict the energy-saving rate r of the chiller 机 and the energy-saving amount W 机 , predict the energy-saving rate r of the circulation pump 泵 and the energy-saving amount W 泵 , compare the energy efficiency ratios of the chiller and the central air-conditioning system, judge the energy efficiency ratio level, and calculate the carbon emission data that can be reduced by energy-saving transformation.

[0012] To protect the host computer from external damage, a box cover is installed on the protection box, a protection pad for protecting the host computer is installed on the box cover, and mutually cooperating lock catches are installed on the protection box and the box cover respectively.

[0013] To reasonably allocate the internal storage space of the protection box, a positioning member for clamping the host computer is installed on the inner wall of the protection box. On the side of the inner wall of the positioning member, a receiving strip for receiving the host computer is installed. Inside the positioning member, there is also a partition strip, which divides the internal space of the positioning member into storage rooms for storing the transformer, meter reader, ultrasonic flowmeter, temperature and humidity sensor and electricity meter.

[0014] In order to improve the convenience of use of the acquisition device, the current transformer is an open-type current transformer, the meter reader is a wireless meter reader, the electric meter is a wireless smart electric meter, and the ultrasonic flowmeter is a wireless external clamp-type ultrasonic flowmeter. The ultrasonic flowmeter includes an upstream sensor probe and a downstream sensor probe.

[0015] In order to facilitate device connection, a power supply port, an RS485 port, an RJ45 port, and a wireless antenna interface are provided on the interface board.

[0016] In order to achieve wireless transmission, the wireless communication module is respectively communicatively connected to the customized controller, the meter reader, the electric meter, and the ultrasonic flowmeter.

[0017] In the second aspect of the present invention, an on-line detection method is also proposed. Using the above-mentioned portable energy efficiency on-line detection device for on-line detection, the detection method includes the following steps:

[0018] S1. Calculate the real-time cooling capacity Q of the central air-conditioning system 冷 ; specifically, it includes the following steps: collect and calculate the real-time temperature of the circulating water of the central air-conditioning system and calculate the temperature difference between the inlet and outlet water, collect the flow rate M of the circulating water, and then calculate the cooling capacity value Q of the real-time operation of the central air-conditioning through the thermodynamic formula Q 冷 = C×M×(T 进 -T 出 ) 冷 ; the process of collecting and calculating the real-time temperature of the circulating water of the central air-conditioning system is as follows: collect the temperatures of the inlet and outlet water on the evaporator side from the chiller through the temperature and humidity sensor to characterize the water temperatures of the chilled water supply and return main pipes, so as to calculate the temperature difference between the inlet and outlet water;

[0019] S2. Collect the power consumption P of the chiller, circulating pump, and cooling tower fan during operation through the electric meter or meter reader 总 ;

[0020] S3. Calculate the real-time operation energy efficiency ratio COP of the central air-conditioning system 系实 , where COP 系实 = Q 冷 ÷P 总 ;

[0021] S4. Calculate the real-time operation energy efficiency ratio COP of the chiller 机实 , where COP 机实 = Q 冷 ÷P 机 , P 机 is the power consumption of the chiller during operation;

[0022] S5. Predict the energy saving rate r 机 and the energy saving amount W 机 ;

[0023] S6. Predict the energy-saving rate r of the circulating pump 泵 and the energy-saving amount W 泵 ;

[0024] S7. Compare the energy efficiency ratios of the chiller and the central air-conditioning system, judge the energy efficiency ratio level, and calculate the carbon emission data that can be reduced by the energy-saving transformation.

[0025] The process of collecting the flow rate M of the circulating water is as follows: If the circulating pump is not equipped with a frequency converter, the circulating volume of the chilled water is measured by an ultrasonic flowmeter; if the circulating pump is already equipped with a frequency converter, the flow rate M of the circulating water is automatically calculated according to the pump similarity law.

[0026] The energy-saving rate r of the chiller 机 ≈ {1 - (COP 机实 ÷COP 机额 )} × 100%, where COP 机实 = Q 冷实 ÷P 机实 , COP 机额 = Q 冷额 ÷P 机额 , Q 冷实 is the actual refrigerating capacity of the chiller under partial load, P 机实 is the actual power consumption of the chiller under partial load, Q 冷额 is the rated refrigerating capacity of the chiller under rated conditions, P 机额 is the rated power consumption of the chiller under rated conditions;

[0027] The calculation formula for the energy-saving amount W of the chiller 机 is: where W 机n is the power consumption of the nth group of chillers at a certain moment, r 机n is the energy-saving rate of the nth group of chillers at a certain moment;

[0028] The process of calculating the energy-saving rate r of the circulating pump 泵 is as follows: Determine the actual refrigerating capacity of the chiller according to the refrigerating capacity value Q 冷 of the central air-conditioning system in real-time operation, and adjust the temperature difference between the inlet and outlet water to the rated-condition temperature difference △T1, then predict the circulating water flow rate Then calculate the energy-saving rate r of the circulating pump according to the relationship between the flow rate, power and speed of the circulating pump similarity law 泵 , the energy-saving rate r 泵 of the circulating pump where,

[0029]

[0030] M1 is the predicted circulating water flow rate after adjusting the temperature difference, and n is the rated speed of the circulating pump, n1 is the corresponding speed of the circulating pump after adjusting the flow rate, P is the rated power of the circulating pump, and P1 is the predicted power after adjusting the temperature difference;

[0031] The energy savings W of the circulating pump 泵 is calculated by the formula: where W 泵n is the power consumption of the nth group of circulating pumps at a certain moment, and r 泵n is the energy saving rate of the nth group of circulating pumps at a certain moment.

[0032] The beneficial effects of the present invention are as follows: for the portable on-line energy efficiency detection device and the on-line detection method, the upper computer main board and the customized controller are installed in a movable housing, the upper computer is constructed through the box structure, and information interaction is realized through the wireless communication module and the connection ports on the interface board, so as to realize the on-line detection function. An integrated structure is adopted, and each acquisition device is integrated in the protection box, which is convenient to carry, enabling the detection device to be applicable to the real-time operation energy efficiency detection of central air-conditioning systems in different scenarios, ready to use immediately, and effectively avoiding the drawbacks existing in the building automation system.

[0033] Corresponding data information in the central air-conditioning system is collected in real time through current transformers, meter readers, ultrasonic flowmeters, temperature and humidity sensors, and electric meters. Relying on the information transmission of the wireless communication module, after the customized controller receives the data, it can filter, count, and calculate the data, and analyze and reason about the calculation results, so as to realize the real-time monitoring of the operation status of the central air-conditioning system, and be able to predict the energy saving rate and energy savings of equipment such as chillers and circulating pumps.

[0034] The water temperature of the chilled water supply and return main pipes is characterized by collecting the return water temperature on the evaporator side of the chiller, and the wireless external clamp ultrasonic flowmeter is used to collect the cooling water circulation volume. There is no need to break the pipe and drain for installation, and it only needs to be installed on the outer wall of the pipe, and the required data can be collected quickly and conveniently.

[0035] The open-type current transformer is used to collect the power consumption of equipment such as chillers, circulating pumps, and cooling tower fans, abandoning the installation method of the previous perforated current transformer. The open-type current transformer does not require power-off, and the installation process is simple and convenient, and on-line installation can be realized, which can not affect the normal operation of the equipment to be collected. Description of the Drawings

[0036] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0037] Figure 1 It is a schematic diagram of the internal modules of the host computer of the present invention;

[0038] Figure 2 is a schematic diagram of the internal modules of the customized controller of the present invention;

[0039] Figure 3 It is a structural schematic diagram of the protection box of the present invention;

[0040] Figure 4 It is a schematic diagram of the structure inside the protection box of the present invention;

[0041] Figure 5 It is a structural schematic diagram of the host computer of the present invention;

[0042] Figure 6 It is a structural schematic diagram of the interface board of the present invention;

[0043] Figure 7 It is a flow chart of the online detection method of the present invention.

[0044] The markings in the figure are: 1. Protection box; 2. Lock; 3. Host computer; 301. Shell; 302. Cover; 303. Handle; 304. Display; 305. Operation table; 306. Power port; 307. RS485 port; 308. RJ45 port; 309. Wireless antenna interface; 4. Positioning piece; 5. Box cover; 6. Protection pad; 7. Support strip; 8. Dividing strip. DETAILED DESCRIPTION

[0045] Embodiment 1

[0046] like Figure 1 As shown, a portable energy efficiency online detection device includes a host computer 3, which is snapped into the interior of a protection box 1. A box cover 5 is installed on the protection box 1, and a protection pad 6 for protecting the host computer 3 is installed on the box cover 5. The protection pad 6 can be made of foam, rubber or other materials. The protection box 1 and the box cover 5 are respectively equipped with locks 2 that cooperate with each other.

[0047] The protection box 1 is also provided with a mutual inductor for collecting the power consumption of the chiller, circulating pump, and cooling tower fan, a meter reader for reading the meter data, an ultrasonic flow meter and a temperature and humidity sensor for collecting the circulation volume of chilled water, and an electric meter.

[0048] Among them, the transformer is an open-type current transformer, the meter reader is a wireless meter reader, the electric meter is a wireless smart electric meter, and the ultrasonic flowmeter is a wireless clamp-on ultrasonic flowmeter.

[0049] When installing a traditional current transformer, the main power supply of the distribution control cabinet needs to be disconnected, which affects the normal operation of the equipment during installation. In contrast, when installing an open-type current transformer, power outage is not required, and it can be operated while the power is on without affecting the normal operation of the equipment, which has the advantage of convenient installation.

[0050] The wireless smart meter does not need to be connected to a communication line and uses wireless transmission to communicate data with a customized controller, saving the economic cost of laying communication lines and reducing the construction difficulty. For projects where meters have already been installed, a wireless meter reader can be used to capture meter readings by taking pictures. This method is an existing technology and will not be elaborated here.

[0051] This detection device can collect the temperatures of the chilled water supply and return main pipes. Traditional detection devices install immersion-type water pipe temperature sensors by breaking the pipe for water temperature detection, while this detection device uses a communication method with the chiller to analyze the inlet and outlet water temperatures on the evaporator side of the chiller to obtain the temperatures of the chilled water supply and return main pipes.

[0052] Among them, in the temperatures of the chilled water supply and return main pipes, the temperature of the supply main pipe is the outlet water temperature of the chiller. Since the return main pipe is a mixed temperature and the return water temperature of the evaporator of the parallel chiller is the return water at the same return main pipe, the return water temperature on the evaporator side of the chiller is also the temperature of the chilled water return main pipe. Therefore, the temperatures of the inlet and outlet water on the evaporator side obtained from the chiller through the temperature and humidity sensor can represent the temperatures of the chilled water supply and return main pipes, and the acquisition method is simple and convenient and easy to operate.

[0053] In addition, the chilled water circulation volume is collected by a wireless external clamp-on ultrasonic flowmeter that can be installed on the outer wall of the pipeline without breaking the pipe for drainage. Among them, the wireless external clamp-on ultrasonic flowmeter includes 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 and downstream positions of the chilled water return pipeline in the water flow direction.

[0054] As Figure 2 shown, a positioning member 4 for clamping the upper computer 3 is installed on the inner wall of the protection box 1. The positioning member 4 is provided with a card slot having the same shape as the outer shape of the upper computer 3 for positioning and protecting the upper computer 3 to prevent the upper computer 3 from shifting and colliding. A receiving strip 7 for receiving the upper computer 3 is installed on the side of the inner wall of the positioning member 4. The receiving strip 7 provides a supporting force for the upper computer 3 and can divide the internal space of the positioning member 4 into upper and lower layers to facilitate the use of the lower layer space. A partition strip 8 is also provided inside the positioning member 4. The partition strip 8 divides the internal space of the positioning member 4 into storage rooms for storing current transformers, meter readers, ultrasonic flowmeters, temperature and humidity sensors, and meters. The position of the partition strip 8 can be designed according to usage requirements for reasonable allocation of storage space. The partition strip 8 and the positioning member 4 can be made of materials such as foam and rubber for protecting the devices.

[0055] As Figure 3 shown, the host computer 3 includes a housing 301, an operating table 305 is installed on the housing 301, a cover plate 302 is connected to one side of the housing 301, a display screen 304 that cooperates with the operating table 305 is embedded in the cover plate 302, and the cover plate 302 and the housing 301 form a structure similar to a laptop computer. A matching latch can also be installed between the cover plate 302 and the housing 301 to improve the connection tightness between the cover plate 302 and the housing 301. A handle 303 is provided on the side wall of the cover plate 302.

[0056] As Figure 4 shown, a host computer motherboard, a custom controller, a cooling and heat dissipation unit, a wireless communication module, a hard disk storage unit, and a power conversion module I are installed inside the housing 301. The wireless communication module is respectively communicatively connected to the custom controller, the meter reader, the electric meter, and the ultrasonic flowmeter. An interface board for device connection is also embedded and installed on the housing 301. A power port 306, an RS485 port 307, an RJ45 port 308, and a wireless antenna interface 309 are provided on the interface board. The interface board can connect the internal devices of the host computer 3 to external devices to achieve data transmission, and different wiring ports can meet the wiring requirements of different devices.

[0057] As Figure 5 shown, the custom controller includes a single-chip microcomputer for main control, a power conversion module II for voltage regulation, a communication conversion module I and a communication conversion module II for communication transmission. The two communication transmission and conversion modules are used to share the working pressure of communication conversion.

[0058] The custom controller is used to parse the communication protocol of the chiller, the communication protocol of the frequency converter, the communication protocol of the wireless smart meter, and the protocol of the ultrasonic flowmeter; the custom controller collects the data information collected by each sensor device through the wireless communication module, filters, statistics, and calculates the data information, realizes the real-time monitoring of the operating state of the central air-conditioning system, and compares the calculation results with the international standard indicators to predict data such as the energy-saving rate, energy-saving amount, and reduction of carbon emissions of the central air-conditioning system, which is beneficial for the inspectors to understand the performance of the inspected central air-conditioning system.

[0059] When the portable energy efficiency on-line detection device is used, the following steps are required:

[0060] 1. Deploy the portable energy efficiency on-line detection device:

[0061] Place the detection device at a suitable location (a dry and cool place away from air-conditioning equipment and water pipes), connect the working power supply through the power port 306, then open the protection box 1, take out devices such as the upper computer 3, split-core current transformer, wireless meter reader, and wireless external clamp-on ultrasonic flowmeter according to the actual on-site situation, and then set parameters such as the meter communication address, flowmeter communication address, and chiller communication address through the upper computer 3.

[0062] 2. Install the wireless meter reader or split-core current transformer:

[0063] (1) If the device to be detected is already equipped with a meter, read the information of the existing meter through the wireless meter reader.

[0064] (2) If the device to be detected is not equipped with a meter, in order to ensure that it does not affect the normal operation of the device, install and wire it without power off through the split-core current transformer. After wiring is completed, set corresponding parameters such as the transformer ratio, three-phase balanced load, and communication address.

[0065] 3. Install the wireless external clamp-on ultrasonic flowmeter or connect the frequency converter communication line:

[0066] (1) If the frequency converter is not installed in the distribution control cabinet of the chilled water circulation pump, a wireless external clamp-on ultrasonic flowmeter needs to be installed on the chilled water return main pipe, and the installation should comply with the installation requirements of the manufacturer of the wireless external clamp-on ultrasonic flowmeter.

[0067] After determining the installation position, remove the pipeline insulation material of the original chilled water return main pipe, and then set the relevant parameters of the flowmeter. The parameters include: installation method, pipe diameter, wall thickness, fluid medium, flow velocity, etc. Use sandpaper to remove the painted part of the pipeline at the installation point until the metal part is exposed. Stick and fix the upstream sensor probe and downstream sensor probe on the outer wall of the pipeline, and then fix it again with a metal hoop to prevent the probe from shifting due to pipeline vibration. After the installation is completed, set the communication address of the flowmeter.

[0068] (2) If the frequency converter is already installed in the distribution control cabinet of the chilled water circulation pump, connect the frequency converter communication line and calculate the actual circulation volume of the chilled water under the variable frequency condition using the similarity law of the water pump. This method requires placing the circulation pump under the rated working condition and rated head.

[0069] The specific connection method is: open the distribution control cabinet of the circulation pump, find the RS485 communication port or RJ45 communication port of the frequency converter; connect the communication wiring port on the frequency converter in the distribution control cabinet to the corresponding wiring port of the customized controller with a temporary communication line RVSP2X1.0 or network cable.

[0070] 4. Connect the chiller communication line:

[0071] Open the control box that comes with the chiller, find the communication wiring port, and connect the communication wiring port of the chiller to the corresponding RS485 port of the customized controller with a temporary communication cable RVSP2X1.0 inside the control box.

[0072] 5. Set the relevant parameters of the test object:

[0073] Input the relevant parameter information of the test object into the detection system of the customized controller through the upper computer 3. After the input is completed, online detection can be carried out. Among them, the relevant parameters of the test object include: central air-conditioning system type, operation mode, number of chillers, rated cooling capacity of a single chiller, rated input power of a single chiller, number of chilled water circulation pumps, rated flow of a single chilled water circulation pump, rated head of a single chilled water circulation pump, number of cooling water circulation pumps, rated flow of a single cooling water circulation pump, rated head of a single cooling water circulation pump, number of cooling tower fans, rated power of a single cooling tower fan, power consumption reading method, flow rate acquisition method.

[0074] Embodiment 2

[0075] As Figure 7 shown, in the second aspect of the present invention, an online detection method is also proposed. Use the above-mentioned portable energy efficiency online detection device for online detection. The detection method includes the following steps:

[0076] S1. Calculate the real-time cooling capacity Q of the central air-conditioning system 冷 ; specifically, it includes the following steps: collect and calculate the real-time temperature of the circulating water in the central air-conditioning system and calculate the temperature difference between the inlet and outlet water, collect the flow rate M of the circulating water, and then calculate the cooling capacity value Q of the central air-conditioning system in real-time operation through the thermodynamic formula Q 冷 = C×M×(T 进 -T 出 ); the process of collecting and calculating the real-time temperature of the circulating water in the central air-conditioning system is as follows: collect the temperatures of the inlet and outlet water on the evaporator side from the chiller through the temperature and humidity sensor to represent the water temperatures of the chilled water supply and return mains, and thus calculate the temperature difference between the inlet and outlet water; 冷

[0077] S2. Collect the power consumption P of the chiller, circulating pump, and cooling tower fan during operation through an electric meter or a meter reader 总 ;

[0078] S3. Calculate the real-time operation energy efficiency ratio COP of the central air-conditioning system 系实 系实 , where COP 冷 = Q 冷 ÷P 总 ;

[0079] S4. Calculate the real-time operation energy efficiency ratio COP of the chiller机实 , where COP 机实 = Q 冷 ÷ P 机 , P 机 is the power consumption of the chiller during operation;

[0080] S5. Predict the energy-saving rate r 机 and the energy-saving amount W 机 ;

[0081] S6. Predict the energy-saving rate r 泵 and the energy-saving amount W 泵 ;

[0082] S7. Compare the energy efficiency ratios of the chiller and the central air-conditioning system, judge the energy efficiency ratio level, and calculate the carbon emission data that can be reduced by the energy-saving transformation.

[0083] The acquisition process of the flow rate M of the circulating water is as follows: If the circulating pump is not equipped with a frequency converter, the circulating volume of the chilled water is measured by an ultrasonic flowmeter; if the circulating pump is already equipped with a frequency converter, the flow rate M of the circulating water is automatically calculated according to the pump similarity law.

[0084] The energy-saving rate r 机 of the chiller is approximately {1 - (COP 机实 ÷ COP 机额 )} × 100%, where COP 机实 = Q 冷实 ÷ P 机实 , COP 机额 = Q 冷额 ÷ P 机额 , Q 冷实 is the actual refrigerating capacity of the chiller under partial load, P 机实 is the actual power consumption of the chiller under partial load, Q 冷额 is the rated refrigerating capacity of the chiller under rated conditions, P 机额 is the rated power consumption of the chiller under rated conditions;

[0085] The calculation formula for the energy-saving amount W 机 of the chiller is: where W 机n is the power consumption of the nth group of chillers at a certain moment, r 机n is the energy-saving rate of the nth group of chillers at a certain moment;

[0086] The process of calculating the energy-saving rate r 泵 of the circulating pump is as follows: According to the refrigerating capacity value Q 冷Determine the real-time refrigerating capacity of the chiller, and adjust the temperature difference between the inlet and outlet water to the rated operating condition temperature difference △T1, then predict the circulating water flow rate Then, calculate the energy-saving rate r of the circulating pump according to the relationship between the flow rate, power and rotational speed of the circulating pump in the similarity law 泵 , the energy-saving rate r of the circulating pump 泵 The calculation formula is as follows: Among them,

[0087]

[0088] M1 is the predicted circulating water flow rate after adjusting the temperature difference, and n is the rated rotational speed of the circulating pump, n1 is the rotational speed corresponding to the adjusted flow rate of the circulating pump, P is the rated power of the circulating pump, and P1 is the predicted power after adjusting the temperature difference;

[0089] The energy-saving amount W of the said circulating pump 泵 The calculation formula is as follows: Among them, W 泵n is the power consumption of the nth group of circulating pumps at a certain moment, and r 泵n is the energy-saving rate of the nth group of circulating pumps at a certain moment.

[0090] Specifically, the customized controller is used to compare the energy efficiency ratios of the chiller and the central air-conditioning system and judge the energy efficiency ratio level. The process is as follows: According to the above calculations, the real-time operating efficiency of the chiller and the real-time operating energy efficiency ratio of the central air-conditioning system can be obtained. Compare the calculation results with the relevant national standards to obtain the energy efficiency ratio level of the chiller in this project and the energy efficiency grade of the central air-conditioning system energy efficiency ratio level, so that the central air-conditioning management party can more clearly understand the operating conditions of the central air-conditioning system in this project, and also provide data support for the later energy-saving transformation. The reference table for judging the energy efficiency ratio values of the chiller and the system by the national standard is as follows:

[0091] Table 1-1 Comparison Table of Chiller Performance Coefficient and Energy Efficiency Grade

[0092]

[0093] Table 1-2 Energy Efficiency Ratio Grade Comparison Table of Cold Source System

[0094]

[0095]

[0096] Specifically, the customized controller is used to calculate the carbon emission reduction data that can be achieved by the energy-saving transformation, and the process is as follows: According to the total energy savings of the central air-conditioning system predicted and calculated in "Predicting the Energy-saving Rate and Energy Savings of the Chiller" and "Predicting the Energy-saving Rate and Energy Savings of the Circulating Pump", and the carbon emission reduction value per 1 kWh of electricity saved in the national standard, calculate the carbon emission reduction value that can be achieved after the energy-saving transformation, that is, the sum of the energy savings of the chiller and the circulating pump multiplied by the carbon emission reduction value per 1 kWh of electricity saved in the national standard. Specifically, saving 1 kWh of electricity can reduce carbon emissions by 0.785 Kg.

[0097] The foregoing is only the preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A portable on-line energy efficiency detection method, characterized in that Applicable to a portable on-line energy efficiency detection device, the portable on-line energy efficiency detection device includes a host computer (3), the host computer (3) is clamped inside a protection box (1), and inside the protection box (1), there are also arranged a transformer for collecting the electricity consumption of a chiller, a circulating pump and a cooling tower fan, a meter reader for reading meter data, an ultrasonic flowmeter for collecting the chilled water circulation volume, a temperature and humidity sensor, and a meter. The host computer (3) includes a housing (301), an operation table (305) is installed on the housing (301), a cover plate (302) is connected to one side of the housing (301), a display screen (304) cooperating with the operation table (305) is embedded on the cover plate (302), and a handle (303) is arranged on the side wall of the cover plate (302). Inside the housing (301), there are installed a host computer motherboard, a customized controller, a cooling and heat dissipation unit, a wireless communication module, a hard disk storage unit and a power conversion module I, and an interface board for device connection is also embedded on the housing (301). The customized controller includes a single-chip microcomputer for main control, a power conversion module II for voltage regulation, a communication conversion module I and a communication conversion module II for communication transmission. The customized controller is used to calculate the real-time cooling capacity Q of the central air-conditioning system 冷 , collect the power consumption P of the operation of the chiller, circulating pump and cooling tower fan 总 , calculate the real-time operating energy efficiency ratio COP of the central air-conditioning system 系实 , calculate the real-time operating energy efficiency ratio COP of the chiller 机实 , predict the energy saving rate r of the chiller 机 and the energy saving amount W 机 , predict the energy saving rate r of the circulating pump 泵 and the energy saving amount W 泵 , compare the energy efficiency ratios of the chiller and the central air-conditioning system, judge the energy efficiency ratio level, and calculate the carbon emission data that can be reduced by energy-saving transformation; The portable on-line energy efficiency detection method includes the following steps: S1. Calculate the real-time cooling capacity Q of the central air-conditioning system 冷 ; Specifically, it includes the following steps: collect and calculate the real-time temperature of the circulating water in the central air-conditioning system and calculate the temperature difference between the inlet and outlet water, collect the flow rate M of the circulating water, and then through the thermodynamic formula Q 冷 = C × M × (T 进 - T 出 ) to calculate the numerical value Q of the cooling capacity of the central air-conditioning system in real-time operation 冷 ; The process of collecting and calculating the real-time temperature of the circulating water in the central air-conditioning system is as follows: collect the temperatures of the inlet and outlet water on the evaporator side from the chiller through a temperature and humidity sensor to represent the water temperatures of the chilled water supply and return main pipes, so as to calculate the temperature difference between the inlet and outlet water; S2. Collect the power consumption P of the chiller, circulation pump, and cooling tower fan through an electricity meter or a meter reader. 总 ; S3. Calculate the real-time operating energy efficiency ratio COP of the central air conditioning system 系实 , where COP 系实 = Q 冷 ÷ P 总 ; S4. Calculate the real-time operating energy efficiency ratio COP of the chiller 机实 , where COP 机实 = Q 冷 ÷ P 机 , P 机 is the power consumption of the chiller during operation; S5. Predict the energy-saving rate r and energy-saving amount W of the chiller 机 And the energy-saving amount W 机 ; The energy-saving rate r of the chiller 机 ≈ {1 - (COP 机实 ÷COP 机额 )} × 100%, where, COP 机实 = Q 冷实 ÷P 机实 , COP 机额 = Q 冷额 ÷P 机额 , Q 冷实 is the actual refrigerating capacity of the chiller under part-load condition, P 机实 is the actual power consumption of the chiller under part-load condition, Q 冷额 is the rated refrigerating capacity of the chiller under rated working condition, P 机额 is the rated power consumption of the chiller under rated working condition; The energy savings W of the chiller 机 is calculated as follows: where W 机n is the power consumption of the nth group of chillers at a certain moment, and r 机n is the energy saving rate of the nth group of chillers at a certain moment; S6. Predict the energy-saving rate r of the circulation pump 泵 and the energy-saving amount W 泵 ; The process of calculating the energy-saving rate r of the circulation pump 泵 is as follows: Determine the real-time refrigerating capacity of the chiller according to the refrigerating capacity value Q of the central air conditioner running in real time 冷 and adjust the temperature difference between the inlet and outlet water to the rated working condition temperature difference △T1, then predict the circulating water flow rate Then calculate the energy-saving rate r of the circulation pump according to the relationship between the flow rate, power and rotational speed of the circulation pump by the similarity law 泵 , the energy-saving rate r of the circulation pump 泵 The calculation formula is: Among them, M1 is the predicted circulating water flow rate after adjusting the temperature difference, and n is the rated speed of the circulating pump, n1 is the speed corresponding to the circulating pump after adjusting the flow rate, P is the rated power of the circulating pump, and P1 is the predicted power after adjusting the temperature difference; The energy savings W of the circulation pump 泵 is calculated by the formula: where W 泵n is the power consumption of the nth group of circulation pumps at a certain moment, and r 泵n is the energy saving rate of the nth group of circulation pumps at a certain moment; S7. Compare the energy efficiency ratios of the chiller and the central air-conditioning system, judge the energy efficiency ratio level, and calculate the carbon emission data that can be reduced by energy-saving transformation.

2. The portable online energy efficiency detection method according to claim 1, wherein A box cover (5) is installed on the protection box (1), a protection pad (6) for protecting the host computer (3) is installed on the box cover (5), and mutually cooperating lock catches (2) are installed on the protection box (1) and the box cover (5) respectively.

3. The portable online energy efficiency detection method according to claim 1, characterized in that A positioning member (4) for clamping the host computer (3) is installed on the inner wall of the protection box (1), a receiving strip (7) for receiving the host computer (3) is installed on the edge side of the inner wall of the positioning member (4), and a partition strip (8) is also arranged inside the positioning member (4). The partition strip (8) divides the internal space of the positioning member (4) into a storage chamber for storing the transformer, the meter reader, the ultrasonic flowmeter, the temperature and humidity sensor and the meter.

4. The portable online energy efficiency detection method according to 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 includes an upstream sensor probe and a downstream sensor probe.

5. The portable online energy efficiency detection method according to claim 1, characterized in that, Power ports (306), RS485 ports (307), RJ45 ports (308) and wireless antenna interfaces (309) are arranged on the interface board.

6. The portable online energy efficiency detection method according to claim 1, wherein The wireless communication module is respectively in communication connection with the customized controller, the meter reader, the meter and the ultrasonic flowmeter.

7. The portable online energy efficiency detection method according to claim 1, wherein, The process of collecting the flow rate M of the circulating water is as follows: If the circulating pump is not equipped with a frequency converter, the chilled water circulation volume is measured by the ultrasonic flowmeter; if the circulating pump is already equipped with a frequency converter, the flow rate M of the circulating water is automatically calculated according to the pump similarity law.

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