CN102345951B - Energy efficiency estimation online monitoring system for refrigerating system - Google Patents
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Abstract
The invention discloses an energy efficiency estimation online monitoring system for a refrigerating system, which is used for online monitoring on temperature, pressure and energy consumption in the refrigerating system. The monitoring system comprises a data acquisition device, a room temperature-energy consumption modification and display device, a refrigerating coefficient modification and display device and a monitoring center. The monitoring center is connected with the data acquisition device via the Internet or the GPRS (General Packet Radio Service); the data acquisition device acquires the room temperature and temperature, pressure and energy consumption parameters of the refrigerating system; the room temperature-energy consumption modification and display device modifies the refrigerating system energy consumption acquired by the data acquisition device, and further outputs the modified data; the refrigerating coefficient modification and display device modifies the refrigerating coefficients, and further outputs the modified data; and the monitoring center finishes the works of analyzing the temperature, the pressure, the actual energy efficiency coefficient and the energy consumption of the refrigerating system, executing early warning, displaying, querying and the like, thereby realizing online monitoring and fault diagnosis, maintaining high-efficiency operation of the whole refrigerating system and facilitating the energy efficiency estimation on energy-saving reconstruction projects of the refrigerating system.
Description
Technical field
The present invention relates to a kind of efficiency and be evaluated at line monitoring system, more particularly, relate to a kind of refrigeration system efficiency and be evaluated at line monitoring system.
Background technology
In recent years, along with the pay attention to day by day of international community to energy-saving and emission-reduction, for the reducing energy consumption project of the refrigeration system of high power consumption, start one after another.For this type of technological transformation project, one of them important problem is exactly the checking for energy-saving effect before and after transformation.At present, general method is that independent ammeter is installed in refrigeration system, by power consumption before and after technological transformation to monitoring system Energy-saving Situation recently.The method subject matter is, by ammeter, directly reads energy consumption data, does not consider that external environment changes the impact on refrigeration system.The variation of room temperature is to affect the main factor that refrigeration system energy consumption changes.Existing monitoring system can not change the impact on system power dissipation room temperature and take into account, and can only be chosen at the more stable time period of room temperature, or change the impact bring and carry out power consumption contrast by ignoring room temperature, both reduced operating efficiency, affect again the accuracy of reducing energy consumption compliance test result.In addition, the transformation front and back running status that relies on merely power consumption contrast can not monitor refrigeration system changes, and is difficult to the fault that discovery and removal system may exist and occur, therefore be difficult to more effectively guidance system optimization.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provides a kind of refrigeration system efficiency to be evaluated at line monitoring system.
The technical solution adopted for the present invention to solve the technical problems is: a kind of refrigeration system efficiency is evaluated at line monitoring system, and it comprises:
Data acquisition unit (102), for gathering temperature, pressure, the power consumption parameter of room temperature and refrigeration system (101);
Room temperature-power consumption correction display unit (103), receives the power consumption that data acquisition unit (102) gathers, and according to power consumption described in room temperature correction, and by the power consumption output display of having revised;
Coefficient of refrigerating performance correction display unit (104), receives the data that data acquisition unit (102) gathers, and according to the compressor efficiency revised theory coefficient of refrigerating performance of Kano coefficient and refrigeration system, and by the coefficient of refrigerating performance output display of having revised.
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, described room temperature-power consumption correction display unit (103) comprises room temperature-power consumption amending unit, actual power loss display unit, power consumption correction value corresponding to pre-stored each room temperature of described room temperature-power consumption amending unit, described actual power loss display unit is used for showing actual power loss.
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, described coefficient of refrigerating performance correction display unit (104) comprises coefficient of refrigerating performance amending unit, actual coefficient of refrigerating performance display unit, described coefficient of refrigerating performance amending unit is used for according to the compressor efficiency revised theory coefficient of refrigerating performance of Kano coefficient and refrigeration system, and described actual coefficient of refrigerating performance display unit is for showing the coefficient of refrigerating performance of having revised.
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, described data acquisition unit (102) comprises temperature collecting cell, pressure acquisition unit, power consumption collecting unit.
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, described data acquisition unit (102) is connected with remote monitoring center (105) by internet or GPRS, and described room temperature-power consumption correction display unit (103), coefficient of refrigerating performance correction display unit (104) are all located at described monitoring center (105).
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, described room temperature-power consumption correction display unit (103), coefficient of refrigerating performance correction display unit (104) are realized by same server.
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, described monitoring center (105) also comprises:
Distributed-network monitoring platform (202), real time operating system, the data base set set up on the platform of the computer operating system user's application system of unifying, for user authority management, user basic information safeguard, the statistics of Monitoring Data and calculating, early warning processing etc.;
Network communication module (201), is connected with described distributed-network monitoring platform (202), for receiving the information of being sent by internet or GPRS by described data acquisition unit (102) and processing;
Service Management instrument (203), is connected with described distributed-network monitoring platform (202), is at upper database management module and the system management facility of setting up of described distributed-network monitoring platform (202), for to the management of system and device, diagnosis, analysis etc.;
Website release unit (204), is connected with described distributed-network monitoring platform (202), for issuing monitoring result.
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, described distributed-network monitoring platform (202) comprises alarm unit (2024), the compression ratio unit (2021) being connected respectively with described alarm unit (2024), degree of supercooling unit (2022), degree of superheat unit (2023).
In refrigeration system efficiency of the present invention, be evaluated in line monitoring system, it is on-the-spot that described room temperature-power consumption correction display unit (103), coefficient of refrigerating performance correction display unit (104) are all located at described refrigeration system.
Implement refrigeration system efficiency of the present invention and be evaluated at line monitoring system, there is following beneficial effect: refrigeration system gathers the temperature of refrigeration system by data acquisition unit, pressure, power consumption parameter, by room temperature-power consumption correction display unit correction room temperature, for the impact of refrigeration system power consumption and the actual efficiency of carrying out after energy-conservation technological transformation by coefficient of refrigerating performance correction display unit correction coefficient of refrigerating performance real-time exhibition refrigeration system, change, and show analysis result by a website for user, make the user can be online, intuitively, in real time, detect exactly the ruuning situation of whole refrigeration system, therefore, refrigeration system efficiency of the present invention is evaluated at line monitoring system and not only the checking of energy-saving effect before and after refrigeration system transformation is had to very important effect, can also find the fault that may exist and occur with removal system, more effective guidance system cooling system is optimized.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structure chart that refrigeration system efficiency of the present invention is evaluated at line monitoring system;
Fig. 2 is the structural representation that refrigeration system efficiency of the present invention is evaluated at monitoring center in line monitoring system.
The specific embodiment
In order to make object of the present invention clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, in a kind of refrigeration system efficiency of the present invention, be evaluated in line monitoring system, it comprises data acquisition unit 102, room temperature-power consumption correction display unit 103, coefficient of refrigerating performance correction display unit 104He monitoring center 105.Data acquisition unit 102, for gathering temperature, pressure, the power consumption parameter of room temperature and refrigeration system 101; Gather the suction temperature T of compressor
s, compressor exhaust temperature T
d, condenser cooling medium liquid fluid line temperature T
l, space temperature T is cooled
b, room temperature T
a, suction pressure of compressor P
s, Compressor Discharge Pressure P
d, energy consumption of compressor W
c, total system power consumption W, evaporator evaporation temperature T
e.Room temperature-power consumption correction display unit 103, receives the power consumption that data acquisition unit 102 gathers, and according to power consumption described in room temperature correction, and by the power consumption output display of having revised; Coefficient of refrigerating performance correction display unit 104, receives the data that data acquisition unit 102 gathers, and according to the compressor efficiency revised theory coefficient of refrigerating performance of Kano coefficient and refrigeration system, and by the coefficient of refrigerating performance output display of having revised.Data acquisition unit 102 is monitored the data to be monitored of refrigeration system according to designing requirement, and by the time cycle of setting send to 105，You monitoring center of monitoring center 105 complete information reception, process and be published to website.Query site information comprises: evaporating temperature T
e, condensation temperature T
c, compressor pressure ratios R, degree of supercooling, the degree of superheat, actual coefficient of performance, refrigeration system total energy consumption W, suction pressure of compressor Ps, Compressor Discharge Pressure P
d, power consumption variation etc.Monitoring center 105 completes the needed a series of data of user such as the early warning, demonstration, system diagnostics, maintenance, inquiry, information issue, data retransmission, printing of refrigeration system on-line monitoring.
The concrete structure of Tu2Shi monitoring center 105 of the present invention.Said monitoring center 105 comprises: distributed-network monitoring platform 202, real time operating system, the data base set set up on the platform of the computer operating system user's application system of unifying, for user authority management, user basic information safeguard, the statistics of Monitoring Data and calculating, early warning processing etc.; Network communication module 201, is connected with distributed-network monitoring platform 202, for receiving the information of being sent by internet by data acquisition unit and processing; Service Management instrument 203, is connected with distributed-network monitoring platform 202, is database management module and the system management facility of setting up on distributed-network monitoring platform 202, for to the management of system and device, diagnosis, analysis etc.; Website release unit 204, is connected with distributed-network monitoring platform 202, for issuing monitoring result.Distributed-network monitoring platform 202 comprises alarm unit 2024, the compression ratio unit 2021 being connected respectively with alarm unit 2024, degree of supercooling unit 2022, degree of superheat unit 2023.
Database Systems of the present invention can be inquired about the suction temperature T of the compressor of refrigeration system
s, compressor exhaust temperature T
d, condenser cooling medium liquid fluid line temperature T
l, space temperature T is cooled
b, suction pressure of compressor P
s, Compressor Discharge Pressure P
d, energy consumption of compressor W
c, system total energy consumption W etc., for the efficiency assessment of refrigeration system provides analysis data.
The statistics of Monitoring Data and calculating comprise the evaporating temperature T of refrigeration system
e, condensation temperature T
c, compressor pressure ratios R, degree of supercooling, the degree of superheat, actual coefficient of performance, refrigeration system total energy consumption W.
Evaporating temperature T
ewith condensation temperature T
cobtain in the following manner, the pressure-temperature data of every kind of cold-producing medium are stored in the DBM of distributed-network monitoring platform 202, the suction pressure of compressor P measuring by pressure acquisition unit
sfinding corresponding refrigerant temperature is exactly the evaporating temperature T of system
e; Similarly, Compressor Discharge Pressure P
dcorresponding refrigerant temperature is exactly condensation temperature T
c.
Degree of supercooling unit 2022 is for calculating degree of supercooling, and degree of supercooling is defined as saturated liquid temperature (the condensation temperature T that condenser condenses pressure is corresponding
d) and condensator outlet liquid actual temperature T
ldifference.During refrigeration system normal circulation, the outlet of condenser generally all can have certain degree of supercooling.According to the T collecting
dand T
l, calculate in real time degree of supercooling=T
d-T
l, when degree of supercooling is lower, the alarm unit 2024 in monitoring system sends alarm signal.
Degree of superheat unit 2023 is for calculating the degree of superheat, and the degree of superheat refers to the suction temperature T of refrigerating plant
sevaporating temperature T higher than the evaporimeter under corresponding evaporating pressure
edifference.In order to guarantee the safe handling of compressor, prevent liquid hit phenomenon, require suction temperature than evaporating temperature height a bit, should there is certain degree of superheat.According to the T collecting
sand T
e, calculate in real time degree of supercooling=T
s-T
e, when the degree of superheat is lower, the alarm unit 2024 in monitoring system sends alarm signal.
The process that coefficient of refrigerating performance correction display unit 104 is obtained actual coefficient of performance is as follows:
A) the refrigeration system temperature and pressure parameter arriving by monitoring system real-time collecting, database software by distributed-network monitoring platform is drawn out refrigeration cyclic graph on the pressure heat content figure of corresponding cold-producing medium, can accurately calculate theoretical refrigerating capacity and the theoretical compressor power consumption of system, thereby draw theoretical coefficient of performance of refrigerating.
COP (theory)=theoretical refrigerating capacity/theoretical compressor power consumption
B) by Kano coefficient calculations, go out real coefficient of performance of refrigerating:
COP (Kano)=COP (theory) * Kano coefficient
C) by applied compression engine efficiency, calculate actual energy efficiency coefficient, further improve the degree of accuracy of coefficient of performance of refrigerating:
COP (reality)=COP (Kano) * compressor efficiency
=(theoretical refrigerating capacity/theoretical compressor power consumption) * Kano coefficient * compressor efficiency
D) can also further calculate
Actual refrigerating capacity=compressor actual power loss * COP (reality)
=compressor actual power loss * (calculating refrigerating capacity/calculating compressor power consumption) * Kano coefficient * compressor efficiency
By showing the improvement of coefficient of performance, allow user is directly perceived, science see the energy-saving effect that technological transformation brings.
Room temperature-power consumption correction display unit 103 uses baseline revised law to calculate, and revises room temperature and changes the impact on power consumption.The algorithm of revising is by the data acquisition in validation period, the mean value of the variation that calculates every 1 ℃ of room temperature on system power dissipation impact.The data that collect are divided equally into some groups, the changing value of temperature and corresponding change of power consumption value are contrasted, therefrom draw the changing value that system power dissipation changes corresponding to unit temperature, i.e. kWh/ ℃ of value.These data can be used for extrapolating in measuring temperature range temperature change to system power dissipation proportional-non-linear relation.The data that validation period gathers are more, and the correction factor calculating is just more accurate.By revising, after undergoing technological transformation, can simulate the power consumption of refrigeration system before there is no transformation under different room temperature conditions, thereby compare with the power consumption after technological transformation, obtain actual amount of energy saving.For refrigeration system, when cooled region situation is identical, room temperature is lower, and the power consumption of refrigeration system is just less.
Room temperature-power consumption correction display unit 103 and coefficient of refrigerating performance correction display unit 104 also can be arranged at monitoring center 105, by same server, are realized.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. refrigeration system efficiency is evaluated at a line monitoring system, it is characterized in that, comprising:
Data acquisition unit (102), for gathering temperature, pressure, the power consumption parameter of room temperature and refrigeration system (101);
Room temperature-power consumption correction display unit (103), receives the power consumption that data acquisition unit (102) gathers, and according to power consumption described in room temperature correction, and by the power consumption output display of having revised;
Coefficient of refrigerating performance correction display unit (104), receives the data that data acquisition unit (102) gathers, and according to the compressor efficiency revised theory coefficient of refrigerating performance of Kano coefficient and refrigeration system, and by the coefficient of refrigerating performance output display of having revised;
Further, described room temperature-power consumption correction display unit (103) comprises room temperature-power consumption amending unit, actual power loss display unit, power consumption correction value corresponding to pre-stored each room temperature of described room temperature-power consumption amending unit, described actual power loss display unit is used for showing actual power loss;
Described coefficient of refrigerating performance correction display unit (104) comprises coefficient of refrigerating performance amending unit, actual coefficient of refrigerating performance display unit, described coefficient of refrigerating performance amending unit is used for according to the compressor efficiency revised theory coefficient of refrigerating performance of Kano coefficient and refrigeration system, and described actual coefficient of refrigerating performance display unit is for showing the coefficient of refrigerating performance of having revised;
Concrete efficiency evaluation process is as follows:
The temperature and pressure parameter arriving according to detection system real-time collecting, database software by distributed-network monitoring platform is drawn out refrigeration cyclic graph on the pressure heat content figure of corresponding cold-producing medium, according to described refrigeration cyclic graph, calculate again theoretical refrigerating capacity and the theoretical compressor power consumption of system, thereby draw theoretical coefficient of performance of refrigerating, wherein: theoretical coefficient of performance of refrigerating=theoretical refrigerating capacity/theoretical compressor power consumption;
By Kano coefficient calculations, go out actual coefficient of performance of refrigerating, wherein: actual coefficient of performance of refrigerating=theoretical coefficient of performance of refrigerating * Kano coefficient;
By applied compression engine efficiency, calculate actual refrigeration efficiency coefficient, the degree of accuracy that further improves coefficient of performance of refrigerating, wherein: actual refrigeration efficiency coefficient=actual coefficient of performance of refrigerating * compressor efficiency;
Room temperature-power consumption correction display unit (103) uses correction algorithm to calculate the changing value that refrigeration system power consumption changes corresponding to unit temperature, and by these data extrapolate in measuring temperature range variations in temperature and refrigeration system power consumption proportional-non-linear relation, according to described ratio-non-linear relation, simulate the power consumption of refrigeration system before there is no transformation under different room temperature conditions, and the power consumption after itself and technological transformation is compared, thereby obtain the amount of energy saving of refrigeration system reality, so far complete efficiency assessment.
2. refrigeration system efficiency according to claim 1 is evaluated at line monitoring system, it is characterized in that, described data acquisition unit (102) comprises temperature collecting cell, pressure acquisition unit, power consumption collecting unit.
3. refrigeration system efficiency according to claim 1 is evaluated at line monitoring system, it is characterized in that, described data acquisition unit (102) is connected with remote monitoring center (105) by internet or GPRS, and described room temperature-power consumption correction display unit (103), coefficient of refrigerating performance correction display unit (104) are all located at described monitoring center (105).
4. refrigeration system efficiency according to claim 3 is evaluated at line monitoring system, it is characterized in that, described room temperature-power consumption correction display unit (103), coefficient of refrigerating performance correction display unit (104) are realized by same server.
5. according to the refrigeration system efficiency described in claim 3 or 4, be evaluated at line monitoring system, it is characterized in that, described monitoring center (105) also comprises:
Distributed-network monitoring platform (202), real time operating system, the data base set set up on the platform of the computer operating system user's application system of unifying, for user authority management, user basic information safeguard, the statistics of Monitoring Data and calculating, early warning processing etc.;
Network communication module (201), is connected with described distributed-network monitoring platform (202), for receiving the information of being sent by internet or GPRS by described data acquisition unit (102) and processing;
Service Management instrument (203), is connected with described distributed-network monitoring platform (202), is at upper database management module and the system management facility of setting up of described distributed-network monitoring platform (202), for to the management of system and device, diagnosis, analysis etc.;
Website release unit (204), is connected with described distributed-network monitoring platform (202), for issuing monitoring result.
6. refrigeration system efficiency according to claim 5 is evaluated at line monitoring system, it is characterized in that, described distributed-network monitoring platform (202) comprises alarm unit (2024), the compression ratio unit (2021) being connected respectively with described alarm unit (2024), degree of supercooling unit (2022), degree of superheat unit (2023).
7. refrigeration system efficiency according to claim 6 is evaluated at line monitoring system, it is characterized in that, it is on-the-spot that described room temperature-power consumption correction display unit (103), coefficient of refrigerating performance correction display unit (104) are all located at described refrigeration system.
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| WO2017085525A1 (en) | 2015-11-19 | 2017-05-26 | Carrier Corporation | Diagnostics system for a chiller and method of evaluating performance of a chiller |
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| CN107084478B (en) * | 2017-04-13 | 2019-12-31 | 青岛海尔空调器有限总公司 | Air conditioner refrigeration operation control method |
| CN107192085B (en) * | 2017-04-13 | 2019-12-31 | 青岛海尔空调器有限总公司 | Air conditioner refrigeration operation control method |
| CN107084477B (en) * | 2017-04-13 | 2019-12-31 | 青岛海尔空调器有限总公司 | Heating operation control method for air conditioner |
| US10345038B2 (en) * | 2017-04-25 | 2019-07-09 | Emerson Climate Technologies Retail Solutions, Inc. | Dynamic coefficient of performance calculation for refrigeration systems |
| DE102017214941A1 (en) | 2017-08-25 | 2019-02-28 | Dometic Sweden Ab | Recreational vehicle, cooling device, control system and method of controlling the cooling device |
| WO2019082168A1 (en) | 2017-10-27 | 2019-05-02 | Dometic Sweden Ab | Systems, methods, and apparatuses for providing communications between climate control devices in a recreational vehicle |
| CN109633487B (en) * | 2018-11-13 | 2021-10-08 | 深圳市绿创人居环境促进中心 | Street lamp energy-saving reconstruction testing method and device based on calibration coefficient method |
| CN114636276B (en) * | 2022-05-18 | 2022-07-15 | 深圳市长誉科技有限公司 | Method and equipment for automatically reducing power consumption of refrigeration station based on Internet of things technology |
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