CN104456833A - Energy-saving control method achieving control over temperature parameter measurement - Google Patents
Energy-saving control method achieving control over temperature parameter measurement Download PDFInfo
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- CN104456833A CN104456833A CN201410603252.3A CN201410603252A CN104456833A CN 104456833 A CN104456833 A CN 104456833A CN 201410603252 A CN201410603252 A CN 201410603252A CN 104456833 A CN104456833 A CN 104456833A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides an energy-saving control method achieving control over temperature parameter measurement. The method is characterized in that an energy-saving control system is adopted for energy-saving control, the system comprises a sensor, a data collector, a controller and an actuator which are sequentially connected, the system further comprises a man-machine interaction display screen connected with the controller, the sensor comprises temperature sensor bodies, the actuator comprises a plurality of control switches, the temperature sensor bodies are used for detecting the temperature of corresponding measuring points, the data collector is used for recording temperature values and transmitting the temperature values to the controller, according to the measured values and preset values, the controller judges whether control switches of corresponding refrigerators are switched off or switched on and whether control switches of corresponding cooling water pumps and control switches of cooling towers are switched off or restarted, control instructions are sent, and the control switches receive the corresponding instructions to execute corresponding motions. By means of the control system, refrigerating performance is kept when temperature parameters of the refrigerators change, and a good robustness is achieved.
Description
Technical field
The present invention relates to a kind of be suitable for comfortableness Central Air-condition Refrigerator, measuring tempeature parameter carries out the energy-saving control method that controls, belongs to air-conditioning technical field.
Background technology
For common centrifugal refrierator or screw refrigerator, its internal efficiency corresponding thereto cold (actual refrigerating capacity and the ratio of specified refrigerating capacity, be also often called as rate of load condensate) is relevant, and relative cold is larger, and internal efficiency is higher.Be widely used in comfortableness central air-conditioning in building, its refrigeration system one general configuration multiple stage refrigeration machine, is configured to example with the refrigeration machine that modal 3 sizes are identical.Although different for the operation control method of 3 refrigeration machines, control result all as shown in Figure 1, Fig. 1 is that the ideal of existing control method controls result figure.As can be seen from Figure 1, current control method is adopted, even if in desirable control situation, the internal efficiency of refrigeration machine is also about changing between 0.15 ~ 0.6, overall efficiency is not high, and particularly when total refrigeration duty of building is lower, the efficiency of refrigeration machine is difficult to improve especially.
Existing control method generally all needs to measure semen donors in real time, and controls on this basis.Measure cold to need to install the measuring instrument such as flowmeter and thermometer, during Long-Time Service, often there is relatively large deviation in these instrument (particularly flowmeter) measurement result.Existing control method is because control the reasons such as return difference, and working control result is general as shown in Figure 2, and Fig. 2 is the working control result figure of existing control method.As can be seen from Figure, result is controlled usually not good, away from going mutually from ideal situation.
Summary of the invention
Based on problems of the prior art, the invention provides a kind of be suitable for comfortableness Central Air-condition Refrigerator, measuring tempeature parameter carries out the energy-saving control system that controls, intermittency check is carried out to part or all of refrigeration machine, the efficiency of refrigeration machine is significantly improved, saves electric energy simultaneously.
Technology contents of the present invention:
Measuring tempeature parameter carries out the energy-saving control method controlled, and it is characterized in that: comprise the sensor, data acquisition unit, controller and the actuator that connect successively, also comprise man-machine interaction display screen, it is connected with described controller; Described sensor comprises temperature sensor, and described actuator comprises some gauge taps; Described temperature sensor detects the temperature of corresponding measuring point, the value of temperature described in described data acquisition unit record is also transferred to described controller, described controller carries out judging whether stop or opening corresponding refrigeration machine gauge tap according to described measured value and prior setting value, whether close or restart corresponding cooling water pump gauge tap and cooling tower gauge tap, and sending controling instruction, described gauge tap receives corresponding instruction and performs corresponding action.
Described sensor also comprises current sensor, and described current sensor detects the electric current of corresponding test point, and the value of electric current described in described data acquisition unit record is also transferred to described controller.
Described prior setting value is input to described controller by described man-machine interaction display screen, it comprise refrigeration machine average current in operation than setting value A%, chilled water return water temperature setting value B DEG C, refrigeration machine setting value C downtime min, desired temperature D DEG C of mark room, stop refrigeration machine after indicate the desired temperature E DEG C in room.
Described temperature sensor comprises chilled water return water temperature sensor and mark room temperature sensor, measures chilled water return water temperature, mark room temperature respectively.
Described current sensor has several, measures refrigeration machine a, b in running respectively ... the electric current I of (n)
a, I
bi
n, the average current obtaining refrigeration machine compares I=I
a+ I
b+ ... I
n/ n.
Described gauge tap comprises refrigeration machine gauge tap, corresponding cooling water pump gauge tap and cooling tower gauge tap, and described each gauge tap has several, corresponding with the number of refrigeration machine.
Said method also comprises:
(1) temperature or the electric current of corresponding measuring point is detected;
(2) if described measured value is less than the first setting value, then close an operating refrigeration machine gauge tap, otherwise then terminate described method;
(3) corresponding cooling water pump gauge tap and cooling tower gauge tap is closed;
(4) temperature of another corresponding measuring point of described pent refrigeration machine is detected;
(5) if another measured value described is greater than the second setting value, then judge the downtime of described pent refrigeration machine, otherwise then terminate described method;
(6) if be greater than described setting value C min the downtime of described pent refrigeration machine, then the cooling water pump gauge tap of the correspondence be stopped described in restarting and cooling tower gauge tap and refrigeration machine gauge tap, terminate described method;
(7) if be less than or equal to setting value C min the downtime of described pent refrigeration machine, then judge it is the refrigeration machine enough having other to stop;
(8) if the refrigeration machine having other to stop, then open corresponding cooling tower and cooling water pump, and establish 1 new refrigeration machine newly, terminate described method;
(9) if the refrigeration machine not having other to stop, then revise described second setting value, terminate described method.
When described method is carried out in refrigerating plant room, the electric current of described corresponding measuring point is refrigeration machine a, b in operation ... the electric current I of (n)
a, I
bi
n, described first setting value is A%; The temperature of another corresponding measuring point described is chilled water return water temperature, and described second setting value is B DEG C.
When described method is carried out within the scope of whole building, the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is the temperature indicating room after stopping refrigeration machine, and described second setting value is E DEG C.
When described method is carried out within the scope of refrigerating plant room and whole building simultaneously, the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is chilled water return water temperature, and described second setting value is B DEG C.
Technique effect of the present invention:
Energy-saving control method provided by the invention, current sensor, chilled water and mark room temperature sensor measure respectively operating refrigeration machine electric current, cold send water return water temperature and mark room temperature.Described measured value is transferred to controller by data acquisition unit, described controller judges whether to need cut out 1 refrigeration machine according to described measured value with by the first setting value that man-machine interaction display screen inputs in advance, and described gauge tap receives corresponding instruction and performs corresponding action.When the average current ratio of described operating refrigeration machine or the measured temperature in mark room are less than described first setting value; the semen donors in refrigeration room is greater than demand; described controller exports shutdown command to gauge tap; close the gauge tap of 1 refrigeration machine and corresponding cooling tower and cooling water pump; refrigeration machine is allowed to shut down a period of time; to improve the rate of load condensate of operating refrigeration machine, and then improve the internal efficiency of refrigeration machine.The refrigeration machine of shutting down saves a large amount of electric energy, and refrigeration room utilizes the cold of accumulation slowly to distribute cold to indoor, meets refrigeration demand.The not high and problem that power consumption is large of the internal efficiency avoiding refrigeration machine in existing control system.When chilled water return water temperature measured value or the mark room temperature measured value after closing 1 refrigeration machine are greater than the second setting value, namely described temperature exceeds air-conditioning scope, if the downtime of described pent refrigeration machine is when exceeding setting value, controller exports open command to gauge tap, restart corresponding cooling tower and cooling water pump and described in the gauge tap of refrigeration machine stopped; If the downtime of described pent refrigeration machine is when being less than the second setting value, then controller system detects whether there is other refrigeration machine stopped, if have, export open command to gauge tap, open the gauge tap of corresponding cooling tower and cooling water pump and 1 new machine cold processed; If, controller does not export described second setting value of revision.Control system of the present invention can make to keep refrigeration performance during the temperature parameter change of refrigeration machine, has good robustness.And can revise setting value, reach the rational control to comfortableness Central Air-condition Refrigerator.
Control method of the present invention, by comparing measured value and setting value, reaching intermittence to refrigeration machine and controlling.When the average current ratio of described operating refrigeration machine or the measured temperature in mark room are less than described first setting value; the semen donors in refrigeration room is greater than demand; close 1 refrigeration machine and corresponding cooling tower and cooling water pump; refrigeration machine is allowed to shut down a period of time; to improve the rate of load condensate of operating refrigeration machine, and then improve the internal efficiency of refrigeration machine.The refrigeration machine of shutting down saves a large amount of electric energy, and refrigeration room utilizes the cold of accumulation slowly to distribute cold to indoor, meets refrigeration demand.The not high and problem that power consumption is large of the internal efficiency avoiding refrigeration machine in existing control method.When chilled water return water temperature measured value or the mark room temperature measured value after closing 1 refrigeration machine are greater than the second setting value, namely described temperature exceeds air-conditioning scope, if when exceeding setting value, restart the downtime of described pent refrigeration machine corresponding cooling tower and cooling water pump and described in the refrigeration machine stopped; If the downtime of described pent refrigeration machine is when being less than the second setting value, then controller system detects whether there is other refrigeration machine stopped, if having, opens corresponding cooling tower and cooling water pump and 1 new machine cold processed; If, do not revise described second setting value.Control method of the present invention can make to keep refrigeration performance during the temperature parameter change of refrigeration machine, and can revise setting value, reaches the rational control to comfortableness Central Air-condition Refrigerator.
Accompanying drawing explanation
Fig. 1 is that the ideal of existing control method controls result figure;
Fig. 2 is the working control result figure of existing control method;
Fig. 3 is the structural representation of energy-saving control system of the present invention;
Fig. 4 is the realization flow figure of the first embodiment of energy-saving control method of the present invention;
Fig. 5 is the realization flow figure of the second embodiment of energy-saving control method of the present invention;
Fig. 6 is the realization flow figure of the 3rd embodiment of energy-saving control method of the present invention;
Fig. 7 is that the ideal of energy-saving control method of the present invention controls result figure;
Fig. 8 is the working control result figure of energy-saving control method of the present invention.
Accompanying drawing illustrates:
In Fig. 1 and Fig. 7: the definition of rate of load condensate is at full capacity with the specified cold of separate unit refrigeration machine; Homes Using TV represents to run under the load of correspondence, and refrigeration machine needs the duration of start.Homes Using TV is 1, then represent under corresponding load, and refrigeration machine needs to start shooting always.When Homes Using TV is " 1+0.5 ", represents and drive 2 refrigeration machines, wherein 1 is run continuously, and another 1 is then only had the time of half to open.
In Fig. 2 and Fig. 8: the definition of rate of load condensate is at full capacity with the total specified cold of 3 refrigeration machines.
Detailed description of the invention
In order to understand technology contents of the present invention in detail, will be described as follows by embodiment and accompanying drawing.
As shown in Figure 3, Fig. 3 is the structural representation of control system of the present invention to the structure composition of energy-saving control system of the present invention.Comprise sensor: chilled water return water temperature sensor (the chilled water temperature meter namely in Fig. 3), mark room temperature sensor (room temperature meter namely in Fig. 3), several current sensors (ammeter namely in Fig. 3), data acquisition instrument (data acquisition unit namely in Fig. 3), controller, man-machine interaction display screen, actuator: several refrigeration machine switch actuator, pump switch actuator, cooling tower switch actuator (data are all determined according to on-the-spot refrigeration machine number of units).
Comfort air conditioning system has following characteristic: not quite identical between the refrigeration duty of (1) building and consumption cold, because air-conditioned room exists thermal inertia, when the semen donors short time changes suddenly not in accordance with refrigeration duty demand supplies, room temperature change is not remarkable.(2) comfort air conditioning system allows indoor temperature to there is certain fluctuation.Based on this characteristic, can adopt a kind of energy-conservation refrigerator operation control method, namely carry out intermittence to part or all of refrigeration machine and control, as far as possible the principle of control makes refrigeration machine be in run under rate at full capacity.Such as when certain moment building cooling load is only a half of the specified cold of separate unit refrigeration machine, we work under managing to allow this refrigeration machine not operate in the rate of load condensate of 50%, but allow it run on the rate of load condensate of 100%, thus, the internal efficiency of refrigeration machine just can increase substantially.But now must be greater than demand to the semen donors in room; so refrigeration machine can be allowed to shut down a period of time; during this period, each object in air-conditioned room utilizes the cold of accumulation slowly to distribute cold to indoor, makes indoor temperature slowly rise and be within air-conditioning requirement scope.Restarting the refrigeration machine of closedown when reaching the temperature of setting again, meeting the semen donors in room.
The present invention controls not based on cold, but adopts the more easy and reliable power parameter of measurement to control.The present embodiment adopts the method for only dealing with problems in refrigerating plant room to realize, and detailed process is see Fig. 4.
Described method comprises:
(1) refrigeration machine a, b in operation is detected ... the electric current I of (n)
a, I
bi
n;
(2) than setting value A% if described measured value is less than refrigeration machine average current in described operation, then closes an operating refrigeration machine gauge tap, otherwise then terminate described method;
(3) corresponding cooling water pump gauge tap and cooling tower gauge tap is closed;
(4) that detects described pent refrigeration machine stops chilled water return water temperature after refrigeration machine;
(5) if described measured value is greater than described chilled water return water temperature setting value B DEG C, then judge the downtime of described pent refrigeration machine, otherwise then terminate described method;
(6) if be greater than described setting value C minute the downtime of described pent refrigeration machine, then the cooling water pump gauge tap of the correspondence be stopped described in restarting and cooling tower gauge tap and refrigeration machine gauge tap, terminate described method;
(7) if be less than or equal to setting value C minute the downtime of described pent refrigeration machine, then judge it is the refrigeration machine enough having other to stop;
(8) if the refrigeration machine having other to stop, then open corresponding cooling tower and cooling water pump, and establish 1 new refrigeration machine newly, terminate described method;
(9) if the refrigeration machine not having other to stop, then revise described second setting value, terminate described method.
Another embodiment adopts the method for only dealing with problems within the scope of whole building to realize, and detailed process is see Fig. 5.
Described method comprises:
(1) temperature in mark room is detected;
(2) if described measured value is less than the temperature D DEG C in described mark room, then close an operating refrigeration machine gauge tap, otherwise then terminate described method;
(3) corresponding cooling water pump gauge tap and cooling tower gauge tap is closed;
(4) detect described pent refrigeration machine stop refrigeration machine after indicate the temperature in room;
(5) if described measured value be greater than described in stop refrigeration machine after indicate and then judge the desired temperature E DEG C in room the downtime of described pent refrigeration machine, otherwise then terminate described method;
(6) if be greater than described setting value C min the downtime of described pent refrigeration machine, then the cooling water pump gauge tap of the correspondence be stopped described in restarting and cooling tower gauge tap and refrigeration machine gauge tap, terminate described method;
(7) if be less than or equal to setting value C min the downtime of described pent refrigeration machine, then judge it is the refrigeration machine enough having other to stop;
(8) if the refrigeration machine having other to stop, then open corresponding cooling tower and cooling water pump, and establish 1 new refrigeration machine newly, terminate described method;
(9) if the refrigeration machine not having other to stop, then revise described second setting value, terminate described method.
An embodiment adopts the method that above two kinds of methods combine again, and the method for namely simultaneously dealing with problems within the scope of refrigerating plant room and whole building, detailed process is see Fig. 6.
(1) temperature in mark room is detected;
(2) if described measured value is less than the temperature D DEG C in described mark room, then close an operating refrigeration machine gauge tap, otherwise then terminate described method;
(3) corresponding cooling water pump gauge tap and cooling tower gauge tap is closed;
(4) temperature stopped after refrigeration machine between iced chamber of described pent refrigeration machine is detected;
(5) if described measured value be greater than described in stop chilled water return water temperature setting value B DEG C after refrigeration machine, then judge the downtime of described pent refrigeration machine, otherwise then terminate described method;
(6) if be greater than described setting value C min the downtime of described pent refrigeration machine, then the cooling water pump gauge tap of the correspondence be stopped described in restarting and cooling tower gauge tap and refrigeration machine gauge tap, terminate described method;
(7) if be less than or equal to setting value C min the downtime of described pent refrigeration machine, then judge it is the refrigeration machine enough having other to stop;
(8) if the refrigeration machine having other to stop, then open corresponding cooling tower and cooling water pump, and establish 1 new refrigeration machine newly, terminate described method;
(9) if the refrigeration machine not having other to stop, then revise described second setting value, terminate described method.
When described method is carried out within the scope of refrigerating plant room and whole building simultaneously, the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is chilled water return water temperature, and described second setting value is B DEG C.
Compare with control method with existing controller, the present invention significantly can improve that the operational efficiency of refrigeration machine, robustness are better, initial cost is more economized.Fig. 7 is that the ideal of energy-saving control method of the present invention controls result.Can find out, the efficiency of refrigeration machine no longer fluctuates, but is in peak 0.6 always.The working control result of energy-saving control method of the present invention as shown in Figure 8.Compared with the working control result of the existing control method in Fig. 2, the present invention can make the efficiency of refrigeration machine improve about 50%, and energy-saving effect is remarkable.
The obtainable energy-conservation achievement of the present invention is relevant with the characteristic of project itself, comprises the refrigeration machine type selection situation of project, the load condition etc. of building.The maximum situation of energy-saving potential is a project for only configuration 1 refrigeration machine.Supposed situation is as follows:
Certain project configuration 1 refrigeration machine, specified refrigerating capacity is 2000kW, and ideal efficiency remains 10 always.Operating load rate is 25% ~ 100%, and the probability that each rate of load condensate occurs is equal, this project whole year operation 2000 hours.In such cases, can judge efficiency of refrigerator can be made to improve 60% in the present invention according to Fig. 2 and Fig. 8.Under this routine condition, refrigeration machine electricity about 240,000 degree can be saved every year.A certain amount of cooling water pump and cooling tower power consumption can be saved in addition.
Claims (10)
1. the measuring tempeature parameter energy-saving control method that carries out controlling, it is characterized in that adopting energy-saving control system to carry out Energy Saving Control, described system comprises the sensor, data acquisition unit, controller and the actuator that connect successively, also comprises man-machine interaction display screen, and it is connected with described controller; Described sensor comprises temperature sensor, and described actuator comprises some gauge taps; Described temperature sensor detects the temperature of corresponding measuring point, the value of temperature described in described data acquisition unit record is also transferred to described controller, described controller judges according to described measured value and prior setting value, judge whether stop or opening corresponding refrigeration machine gauge tap, whether close or restart corresponding cooling water pump gauge tap and cooling tower gauge tap, and sending controling instruction, described gauge tap receives corresponding instruction and performs corresponding action.
2. measuring tempeature parameter according to claim 1 carries out the energy-saving control method that controls, it is characterized in that: described sensor also comprises current sensor, described current sensor detects the electric current of corresponding test point, and the value of electric current described in described data acquisition unit record is also transferred to described controller.
3. measuring tempeature parameter according to claim 2 carries out the energy-saving control method that controls, it is characterized in that detailed process comprises:
(1) temperature or the electric current of corresponding measuring point is detected;
(2) if described measured value is less than the first setting value, then close an operating refrigeration machine gauge tap, otherwise then terminate described method;
(3) corresponding cooling water pump gauge tap and cooling tower gauge tap is closed;
(4) temperature of another corresponding measuring point of described pent refrigeration machine is detected;
(5) if another measured value described is greater than the second setting value, then judge the downtime of described pent refrigeration machine, otherwise then terminate described method;
(6) if be greater than described setting value C minute the downtime of described pent refrigeration machine, then the cooling water pump gauge tap of the correspondence be stopped described in restarting and cooling tower gauge tap and refrigeration machine gauge tap, terminate described method;
(7) if be less than or equal to setting value C minute the downtime of described pent refrigeration machine, then judge it is the refrigeration machine enough having other to stop;
(8) if the refrigeration machine having other to stop, then open corresponding cooling tower and cooling water pump, and establish 1 new refrigeration machine newly, terminate described method;
(9) if the refrigeration machine not having other to stop, then revise described second setting value, terminate described method.
4. energy-saving control method according to claim 3, is characterized in that: described temperature sensor comprises chilled water return water temperature sensor and mark room temperature sensor, measures chilled water return water temperature, mark room temperature respectively.
5. the energy-saving control method according to claim 3 or 4, is characterized in that: when described method is carried out in refrigerating plant room, and the electric current of described corresponding measuring point is refrigeration machine a, b in operation ... the electric current I of (n)
a, I
bi
n, described first setting value is A%; The temperature of another corresponding measuring point described is chilled water return water temperature, and described second setting value is B DEG C.
6. the energy-saving control method according to claim 3 or 4, is characterized in that: when described method is carried out within the scope of whole building, and the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is the temperature indicating room after stopping refrigeration machine, and described second setting value is E DEG C.
7. energy-saving control method according to claim 5, is characterized in that: when described method is carried out within the scope of whole building, and the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is the temperature indicating room after stopping refrigeration machine, and described second setting value is E DEG C.
8. the energy-saving control method according to claim 3 or 4, when described method is carried out within the scope of refrigerating plant room and whole building simultaneously, the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is chilled water return water temperature, and described second setting value is B DEG C.
9. energy-saving control method according to claim 5, when described method is carried out within the scope of refrigerating plant room and whole building simultaneously, the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is chilled water return water temperature, and described second setting value is B DEG C.
10. energy-saving control method according to claim 7, when described method is carried out within the scope of refrigerating plant room and whole building simultaneously, the temperature of described corresponding measuring point is the temperature in mark room, and described first setting value is D DEG C; The temperature of another corresponding measuring point described is chilled water return water temperature, and described second setting value is B DEG C.
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|---|---|---|---|
| CN201410603252.3A CN104456833A (en) | 2014-10-31 | 2014-10-31 | Energy-saving control method achieving control over temperature parameter measurement |
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| CN201410603252.3A CN104456833A (en) | 2014-10-31 | 2014-10-31 | Energy-saving control method achieving control over temperature parameter measurement |
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| CN103673219A (en) * | 2012-09-25 | 2014-03-26 | 成都博课启睿科技有限公司 | Air conditioner energy-saving monitoring system |
| CN103968478A (en) * | 2013-02-01 | 2014-08-06 | Lg电子株式会社 | Chiller System And Control Method Thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008031260A1 (en) * | 2006-09-05 | 2008-03-20 | Next-Bottlay Ecology Instruments Co. Ltd. | An electric power saving system for an air conditioner |
| EP2602565A1 (en) * | 2010-08-06 | 2013-06-12 | Mitsubishi Heavy Industries, Ltd. | Refrigerator controller |
| JP2013142476A (en) * | 2012-01-06 | 2013-07-22 | Orion Machinery Co Ltd | Coupled operation method and system for chiller |
| CN102721156A (en) * | 2012-06-30 | 2012-10-10 | 李钢 | Central air-conditioning self-optimization intelligent fuzzy control device and control method thereof |
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