CN101363654B - Power-saving device of central air-conditioning - Google Patents
Power-saving device of central air-conditioning Download PDFInfo
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- CN101363654B CN101363654B CN2008101421996A CN200810142199A CN101363654B CN 101363654 B CN101363654 B CN 101363654B CN 2008101421996 A CN2008101421996 A CN 2008101421996A CN 200810142199 A CN200810142199 A CN 200810142199A CN 101363654 B CN101363654 B CN 101363654B
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Abstract
The invention provides a central air conditioner and a power saving device thereof, which comprises a temperature detection unit for detecting the temperature of the water inlet and the water outlet of an air conditioning water circulation system; a frequency conversion processing unit for receiving frequency conversion signals and controlling the running frequency of a water pump motor in the water circulation system; a central processing unit for receiving, processing and sending signals which comprise the processes of receiving the temperature of the water inlet and water outlet obtained by the temperature detection unit, calculating the actual temperature difference of the water inlet and the water outlet, calculating a frequency conversion signal which regulates the actual temperature difference to the pre-determined temperature difference and outputs the frequency conversion signal to the frequency conversion processing unit when the actual temperature difference is less than the preset temperature difference, wherein the cooling water and the water pump motor in the cooling water circulation system are controlled by different frequency conversion processing units in one for one mode. The power saving device can effectively save electric energy for the air conditioning system.
Description
Technical field
The present invention relates to air-conditioning system.
Background technology
The prior art central air conditioner system mainly is made up of the chilled water circulatory system, cooling water recirculation system and main frame three parts.
The chilled water circulatory system is made up of refrigerating water pump, indoor fan and chilled water pipeline etc.Send into chilled water pipeline (water outlet) from the cryogenic freezing water that the main frame evaporimeter flows out by the refrigerating water pump pressurization, carry out heat exchange in the inlet chamber, take away the heat in the room, get back to main frame evaporimeter (backwater) at last.Indoor fan is used for blows air over chilled water pipeline, reduces air themperature, heat exchange in the accelerating chamber.
The cooling water cyclic part is made up of coolant pump, cooling water pipeline, cooling tower and condenser etc.When the chilled water circulatory system is carried out indoor heat exchange, take away indoor a large amount of heat energy.This heat energy is given cooling water by the coolant transmission in the main frame, and cooling water temperature is raise.Cooling water after coolant pump will heat up is pressed into cooling tower (water outlet), makes it to carry out heat exchange with atmosphere, sends main condenser (backwater) again back to after the reduction temperature.
Host machine part is made up of compressor, evaporimeter, condenser and refrigerant (cold-producing medium) etc., and its working cycles process is as follows:
At first, the low pressure gaseous coolant is entered condenser and is condensed into highly pressurised liquid gradually by the compressor pressurization.Refrigerant discharges a large amount of heat energy in condensation process, and be condensed cooling water in the device of this part heat energy absorbs and delivers on the outdoor cooling tower, finally discharges into the atmosphere.
Subsequently, during the throttling dropping equipment of the high-pressure liquid refrigerant in the condenser before the evaporimeter of flowing through, gasify, form gas-liquid mixture and enter evaporimeter because of the sudden change of pressure.Refrigerant is constantly gasification in evaporimeter, and the heat in simultaneously can absorption refrigerating water makes it reach lower temperature.Finally, the refrigerant in the evaporimeter after the gasification becomes low-pressure gas again, reenters compressor, so moves in circles.
Through long-term practice, the inventor finds that the prior art central air conditioner system is when design, and the capacity motor of refrigerating water pump, coolant pump is selected according to the design maximum refrigeration duty of building, all leaves certain design margin.Because four seasons weather and day and night temperature change, the refrigeration duty during central air-conditioning work always constantly changes.Fig. 1 and 2 is the central air-conditioning actual measurement refrigeration duty situation in a year and a day respectively in the building, and as shown in the figure, rate of load condensate has surpassed 50% of whole running times in the time below 50% in this central air-conditioning 1 year.Water pump full speed running all the time under the power frequency power supply, ducted water supply flow can only be regulated by valve or reflux type, thereby produces a large amount of throttlings and return loss, also increases the load of motor simultaneously.
Usually the design temperature difference of cooling water pipeline is 5～6 ℃, and practical application shows that the temperature difference of cooling water pipeline in the most of the time only is 2～4 ℃, the rotating speed of water pump is excessive inadequately under these explanation actual conditions, so just form the operating mode of the low temperature difference of central air-conditioning, underload, big working flow, thereby increase the energy loss of pipe-line system, consume many electric energy in vain.
The power consumption of central air-conditioning pump motor accounts for the 20-30% of system's total power consumption, and therefore the water pump output flow that reduces under the non-full load operating mode has very important energy saving meaning.
Summary of the invention
For solving the prior art air-conditioning system, the invention provides a kind of energy-conservation central air-conditioning battery saving arrangement and air-conditioning system in the low technical problem that causes waste of energy of some time internal loading rates.
For the technical solution of the present invention that provides is provided be: a kind of central air-conditioning battery saving arrangement is provided, comprises: temperature detecting unit is used to detect the temperature of air conditioner water circulatory system water entry and EXIT POINT; The frequency-conversion processing unit is used to receive frequency variation signal, and controls the operating frequency of pump motor in the described water circulation system according to described frequency variation signal; CPU is used for receiving, handles and sends signal; Pressure sensing cell is used to detect the actual pressure of air conditioner water circulatory system end and obtain pressure signal, transmits described pressure signal to described CPU; Wherein, described CPU receives described water entry and the EXIT POINT temperature that described temperature detecting unit obtains, the actual temperature that calculates described water entry and EXIT POINT is poor, in described actual temperature difference during less than the design temperature difference, calculate described actual temperature difference is adjusted to the frequency variation signal of described design temperature difference, and export described frequency variation signal to described frequency-conversion processing unit; Described CPU is further according to the minimum pressure of more described actual pressure of described pressure signal and setting, at described actual pressure during less than the minimum pressure set, calculate described actual pressure is adjusted to frequency variation signal more than or equal to described minimum pressure, and export described frequency variation signal to described frequency-conversion processing unit; Described design temperature difference is 5～6 degree; The described frequency variation signal that the actual temperature difference is adjusted to the design temperature difference that calculates, finish dealing with by temperature control integral controller, described temperature control integral controller is provided with the difference and the frequency variation signal one-to-one relationship of described actual temperature difference and design temperature difference, described corresponding relation is: the difference of actual temperature difference and design temperature difference is big, the corresponding frequency variation signal that reduces the pump motor operating frequency; Described frequency-conversion processing unit is the self-turn-off device that adopts Sine Wave Pulse Width Modulation, two kinds of mode of operations of " manually " " automatically " are arranged, the described air conditioner water circulatory system comprises chilled water, cooling water recirculation system, and the pump motor in described chilled water, the cooling water recirculation system adopts the control of one-to-one control mode by different frequency-conversion processing unit respectively; The computing unit that described CPU is made up of temperature comparator, PLC and PID adjuster, it is poor to be provided with described design temperature in the described temperature comparator.
Adopt another technical solution of the present invention for solving the problems of the technologies described above: a kind of air-conditioning system, comprise the chilled water circulatory system, cooling water recirculation system, main frame and central air-conditioning battery saving arrangement, described central air-conditioning battery saving arrangement comprises: temperature detecting unit is used for detecting respectively the temperature of described chilled water, cooling water recirculation system water entry and EXIT POINT; The frequency-conversion processing unit is used to receive frequency variation signal, and controls the operating frequency of pump motor in described chilled water, the cooling water recirculation system according to described frequency variation signal; CPU is used for receiving, handles and sends signal; Pressure sensing cell is used to detect the actual pressure of air conditioner water circulatory system end and obtain pressure signal, transmits described pressure signal to described CPU; Wherein, described CPU receives described water entry and the EXIT POINT temperature that described temperature detecting unit obtains, the actual temperature that calculates described water entry and EXIT POINT is poor, in described actual temperature difference during less than the design temperature difference, calculate described actual temperature difference is adjusted to the frequency variation signal of described design temperature difference, and export described frequency variation signal to described frequency-conversion processing unit; Described CPU is further according to the minimum pressure of more described actual pressure of described pressure signal and setting, at described actual pressure during less than the minimum pressure set, calculate described actual pressure is adjusted to frequency variation signal more than or equal to described minimum pressure, and export described frequency variation signal to described frequency-conversion processing unit; Described design temperature difference is 5～6 degree; The described frequency variation signal that the actual temperature difference is adjusted to the design temperature difference that calculates, finish dealing with by temperature control integral controller, described temperature control integral controller is provided with the difference and the frequency variation signal one-to-one relationship of described actual temperature difference and design temperature difference, described corresponding relation is: the difference of actual temperature difference and design temperature difference is big, the corresponding frequency variation signal that reduces the pump motor operating frequency; Described frequency-conversion processing unit is the self-turn-off device that adopts Sine Wave Pulse Width Modulation, two kinds of mode of operations of " manually " " automatically " are arranged, the described air conditioner water circulatory system comprises chilled water, cooling water recirculation system, and the pump motor in described chilled water, the cooling water recirculation system adopts the control of one-to-one control mode by different frequency-conversion processing unit respectively; The computing unit that described CPU is made up of temperature comparator, PLC and PID adjuster, it is poor to be provided with described design temperature in the described temperature comparator.
Above technical scheme as can be seen, the water supply flow that is different from the prior art air-conditioning system can only be by the mode of valve or reflux type adjusting, the present invention detects by the temperature difference of central air-conditioning battery saving arrangement to the water circulation system pipeline, obtain the load condition of air-conditioning system and it is controlled, thereby realize purpose of energy saving.On concrete, be that actual temperature difference at the water circulation system pipeline is during less than the design temperature difference, calculate the frequency variation signal that described actual temperature difference is adjusted to described design temperature difference, soon the pump operation frequency is adjusted to is enough to make the temperature difference of follow-up water circulation system pipeline to reach the frequency variation signal of setting numerical value.After the actual temperature difference was adjusted to described design temperature difference, the pump operation frequency of water circulation system was comparable originally low when not influencing the air-conditioning system refrigeration, realized effective purpose of energy saving.
Description of drawings
Fig. 1 is the actual measurement refrigeration duty situation schematic diagram of central air-conditioning in 1 year in prior art one building;
Fig. 2 is the central air-conditioning actual measurement refrigeration duty situation schematic diagram in a day respectively among Fig. 1;
Fig. 3 is the theory diagram of air-conditioning system embodiment of the present invention;
Fig. 4 is the theory diagram of central air-conditioning battery saving arrangement embodiment of the present invention.
The specific embodiment
By Hydrodynamics Theory as can be known, the output flow Q of most of fluid transmission equipment (as centrifugal water pump, blower fan etc.) is directly proportional with its rotation speed n; Square being directly proportional of output pressure P (lift) and its rotation speed n; Power output N is directly proportional with the cube of its rotation speed n, can be expressed as with mathematical formulae:
Q＝K1×n
P＝K2×n2
N=Q * P=K3 * n3 (K1, K2, K3 are proportionality constant)
By above-mentioned principle as can be known, reduce the rotating speed of water pump, the power output of water pump just can descend more.As the frequency of supply of motor is reduced to 40Hz by 50Hz, then in theory, low frequency 40Hz is (40/50) 3=0.512 with the ratio of the power output of high frequency 50Hz.
Because the circuit design temperature difference in the cooling water recirculation system is 5～6 ℃ usually, and practical application shows that the pipeline temperature difference in the cooling water recirculation system only is 2～4 ℃ in the most of the time, the present invention sets about thus, when the air-conditioning system underload, reduce the rotating speed of water pump, it is poor to make the pipeline temperature difference in the water circulation system reach design temperature, realizes purpose of energy saving.The inventor proves through long-term practice, in air-conditioning system, insert central air-conditioning battery saving arrangement of the present invention, when the air-conditioning system underload, utilize converter technique to reduce pump rotary speed and reduce ducted flow, to replace prior art valve regulated and reflux type, can obtain remarkable energy saving effect, power saving rate is than higher.The soft start function that while central air-conditioning battery saving arrangement itself has and the characteristics of stepless speed control can realize the steady adjusting to central air-conditioning, and can prolong the service life of unit and pipe group.Describe the present invention in detail below in conjunction with accompanying drawing.
Fig. 3 is for realizing one of air-conditioning system embodiment of the present invention that above-mentioned technique effect provides:
Described air-conditioning system comprises the chilled water circulatory system, cooling water recirculation system, main frame and central air-conditioning battery saving arrangement.The described chilled water circulatory system comprises refrigerating water pump.The cooling water cyclic part comprises coolant pump.The effect of main frame provides chilled water and gives the chilled water circulatory system, receives the heat energy that the chilled water circulatory system is brought, and described heat energy is passed to cooling water recirculation system to distribute.
Please consult Fig. 4 together, described central air-conditioning battery saving arrangement comprises:
Temperature detecting unit is used for detecting respectively the temperature of described chilled water, cooling water recirculation system EXIT POINT and water entry: T1, T2, T3, T4;
The frequency-conversion processing unit is used to receive frequency variation signal, and controls the operating frequency of pump motor in described chilled water, the cooling water recirculation system according to described frequency variation signal;
CPU, be used for receiving, handle and send signal, comprise and receive described water entry and EXIT POINT temperature: the T1 that described temperature detecting unit obtains, T2, T3, T4, the actual temperature that calculates described water entry and EXIT POINT is poor: T2-T1, and T4-T3 is in described actual temperature difference during less than the design temperature difference, calculate described actual temperature difference is adjusted to the frequency variation signal of described design temperature difference, and export described frequency variation signal to described frequency-conversion processing unit.
Above-mentioned air-conditioning system embodiment of the present invention mainly is to increase the central air-conditioning battery saving arrangement on the basis of prior art air-conditioning system, detect by temperature difference, obtain the load condition of air-conditioning system and it is controlled the realization purpose of energy saving the water circulation system pipeline.On concrete, be the operating frequency of pump motor in load hour reduction chilled water, cooling water recirculation system, make load be raised to reasonable level; Otherwise load when excessive then.Being embodied on the present embodiment, then is actual temperature difference at the water circulation system pipeline during less than the design temperature difference, calculates the frequency variation signal that described actual temperature difference is adjusted to described design temperature difference.The frequency variation signal that the actual temperature difference is adjusted to the design temperature difference here, be meant the corresponding relation that obtains the pump operation frequency of each actual temperature difference and needs adjustment through measuring in advance, as long as it is poor to detect the actual temperature of water circulation system pipeline, just can be according to described corresponding relation, calculate with the pump operation frequency adjust to the temperature difference that is enough to make follow-up water circulation system pipeline reach setting numerical value-such as 5 degree-frequency variation signal.
Adopt the invention described above, power savings can be accomplished the 30-50% that economizes on electricity in the water circulation.And as can be seen, the present invention makes to measure the Energy Saving Control of present air-conditioning system, utilizes closed-loop control system that load is monitored in real time, reasonably makes the suitable power of motor output.
In other air-conditioning system embodiments of the present invention, may further include pressure sensing cell, it is used to detect the actual pressure of air conditioner water circulatory system end and obtain pressure signal, transmits described pressure signal to described CPU.In the present embodiment, described CPU is further according to the minimum pressure of more described actual pressure of described pressure signal and setting, at described actual pressure during less than the minimum pressure set, calculate described actual pressure is adjusted to frequency variation signal more than or equal to described minimum pressure, and export described frequency variation signal to described frequency-conversion processing unit.
The purpose that increases pressure sensing cell is to control the minimum pressure of water circulation system, with the desired lift of assurance system, for the above-mentioned power-saving technology effect that reaches provides safeguard.
Above-mentioned temperature, pressure sensing cell can be respectively temperature, pressure sensor.
And the pump motor in described chilled water, the cooling water recirculation system can be respectively by different frequency-conversion processing unit controls.Promptly adopt the one-to-one control mode, control is flexible, and power savings is more obvious.
In addition, can increase man-machine interface with convenient observation and operation, such as increasing LCD interface, PVC keyboard and the LED light that connects described CPU.
Please consulting Fig. 4 again, is one of central air-conditioning battery saving arrangement embodiment provided by the invention, and it comprises:
Temperature detecting unit is used to detect the temperature of air conditioner water circulatory system water entry and EXIT POINT;
The frequency-conversion processing unit is used to receive frequency variation signal, and controls the operating frequency of pump motor in the described water circulation system according to described frequency variation signal;
CPU, be used for receiving, handle and send signal, comprise and receive described water entry and the EXIT POINT temperature that described temperature detecting unit obtains, the actual temperature that calculates described water entry and EXIT POINT is poor, in described actual temperature difference during less than the design temperature difference, calculate described actual temperature difference is adjusted to the frequency variation signal of described design temperature difference, and export described frequency variation signal to described frequency-conversion processing unit.
Present embodiment can be applicable in all temps regulating system, such as air-conditioning system, refrigerator etc., realizes purpose of energy saving.
In another central air-conditioning battery saving arrangement of the present invention, the described frequency variation signal that the actual temperature difference is adjusted to the design temperature difference that calculates can be controlled integration (PID) adjuster by temperature and finish dealing with.The difference that is CPU output actual temperature difference and design temperature difference is to described temperature control PID adjuster, described temperature control PID adjuster is provided with described difference and frequency variation signal one-to-one relationship, described corresponding relation is: the difference of actual temperature difference and design temperature difference is big, the corresponding frequency variation signal that reduces the pump motor operating frequency.
Described CPU calculate the actual temperature of described water entry and EXIT POINT poor, judge whether described actual temperature difference also can be finished by one or more temperature comparators less than the processing of design temperature difference.
Can further include pressure sensing cell, it is used to detect the actual pressure of air conditioner water circulatory system end and obtain pressure signal, transmit described pressure signal to described CPU, this moment, described CPU was further according to the minimum pressure of more described actual pressure of described pressure signal and setting, at described actual pressure during less than the minimum pressure set, calculate described actual pressure is adjusted to frequency variation signal more than or equal to described minimum pressure, and export described frequency variation signal to described frequency-conversion processing unit.
Described frequency-conversion processing unit can adopt the self-turn-off device of Sine Wave Pulse Width Modulation (SPWM), and the frequency control scope can adapt to the requirement of various speed control devices, and frequency range 0.00-50.00HZ is adjustable.The control accuracy height, it is ± 0.01% that the numeral of frequency-conversion processing unit is set resolution ratio, it is ± 0.1% that resolution ratio is set in simulation.
Described frequency-conversion processing unit frequency converter is a capacitive load, can effectively improve the power factor of motor, reduces reactive loss; Also have overcurrent, overvoltage, overload, multiple electronic protection such as overheated, and have abundant fault alarm output function, can effectively guarantee the normal operation of whole system; The startup of frequency conversion dragging system, stop and rate conversion process steady and smooth, comfort is better; Two kinds of mode of operations of " manually " " automatically " are arranged, under the situation that frequency converter breaks down, still can continue operation by the manual work mode; And have Presentation Functions such as voltage, electric current, power factor, frequency.
Described design temperature difference can be 5～6 degree.
Described CPU can be Programmable Logic Controller (PLC), the perhaps computing unit of forming by PLC, PID adjuster and integrated electricity-saving appliance, or, regulate power output according to actual condition by the computing unit that temperature comparator, PLC and PID adjuster are formed.In the computing unit of forming by temperature comparator, PLC and PID adjuster, it is poor to be provided with design temperature in the temperature comparator, compare with the actual temperature difference that obtains from the water circulation system of temperature detecting unit turnover water spot, the difference of actual temperature difference and design temperature difference is input to described PID adjuster through PLC.
In the present embodiment, the setting temperature difference that temperature can be controlled the PID adjuster is set to about 5 ℃, this PID adjuster just can be according to the size of the difference between detected actual temperature difference and the design temperature difference, and calculating the corresponding current analog quantity that export is the frequency variation signal of 4-20mA.When promptly if the actual temperature difference is greater than 5 ℃, the current analog amount that should export changes from 4-20mA.This analog quantity directly outputs on the frequency converter processing unit, and the control frequency converter changes by the frequency range of setting, and final result is that the temperature difference of control water circulation system pipeline is stabilized in 5 ℃.The frequency output of general frequency-conversion processing unit is set at minimum 30HZ, with the corresponding relation of frequency variation signal 4-20mA be 30-50HZ.
More than a kind of air-conditioning system provided by the present invention and central air-conditioning battery saving arrangement are described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (2)
1. a central air-conditioning battery saving arrangement is characterized in that, comprising:
Temperature detecting unit is used to detect the temperature of air conditioner water circulatory system water entry and EXIT POINT;
The frequency-conversion processing unit is used to receive frequency variation signal, and controls the operating frequency of pump motor in the described water circulation system according to described frequency variation signal;
CPU is used for receiving, handles and sends signal;
Pressure sensing cell is used to detect the actual pressure of air conditioner water circulatory system end and obtain pressure signal, transmits described pressure signal to described CPU;
Wherein, described CPU receives described water entry and the EXIT POINT temperature that described temperature detecting unit obtains, the actual temperature that calculates described water entry and EXIT POINT is poor, in described actual temperature difference during less than the design temperature difference, calculate described actual temperature difference is adjusted to the frequency variation signal of described design temperature difference, and export described frequency variation signal to described frequency-conversion processing unit; Described CPU is further according to the minimum pressure of more described actual pressure of described pressure signal and setting, at described actual pressure during less than the minimum pressure set, calculate described actual pressure is adjusted to frequency variation signal more than or equal to described minimum pressure, and export described frequency variation signal to described frequency-conversion processing unit; Described design temperature difference is 5～6 degree;
The described frequency variation signal that the actual temperature difference is adjusted to the design temperature difference that calculates, finish dealing with by temperature control integral controller, described temperature control integral controller is provided with the difference and the frequency variation signal one-to-one relationship of described actual temperature difference and design temperature difference, described corresponding relation is: the difference of actual temperature difference and design temperature difference is big, the corresponding frequency variation signal that reduces the pump motor operating frequency;
Described frequency-conversion processing unit is the self-turn-off device that adopts Sine Wave Pulse Width Modulation, two kinds of mode of operations of " manually " " automatically " are arranged, the described air conditioner water circulatory system comprises chilled water, cooling water recirculation system, and the pump motor in described chilled water, the cooling water recirculation system adopts the control of one-to-one control mode by different frequency-conversion processing unit respectively;
The computing unit that described CPU is made up of temperature comparator, PLC and PID adjuster, it is poor to be provided with described design temperature in the described temperature comparator.
2. an air-conditioning system comprises the chilled water circulatory system, cooling water recirculation system and main frame, it is characterized in that, further comprises: the central air-conditioning battery saving arrangement, and it comprises:
Temperature detecting unit is used for detecting respectively the temperature of described chilled water, cooling water recirculation system water entry and EXIT POINT;
The frequency-conversion processing unit is used to receive frequency variation signal, and controls the operating frequency of pump motor in described chilled water, the cooling water recirculation system according to described frequency variation signal;
CPU is used for receiving, handles and sends signal;
Pressure sensing cell is used to detect the actual pressure of air conditioner water circulatory system end and obtain pressure signal, transmits described pressure signal to described CPU;
Wherein, described CPU receives described water entry and the EXIT POINT temperature that described temperature detecting unit obtains, the actual temperature that calculates described water entry and EXIT POINT is poor, in described actual temperature difference during less than the design temperature difference, calculate described actual temperature difference is adjusted to the frequency variation signal of described design temperature difference, and export described frequency variation signal to described frequency-conversion processing unit; Described CPU is further according to the minimum pressure of more described actual pressure of described pressure signal and setting, at described actual pressure during less than the minimum pressure set, calculate described actual pressure is adjusted to frequency variation signal more than or equal to described minimum pressure, and export described frequency variation signal to described frequency-conversion processing unit; Described design temperature difference is 5～6 degree;
The described frequency variation signal that the actual temperature difference is adjusted to the design temperature difference that calculates, finish dealing with by temperature control integral controller, described temperature control integral controller is provided with the difference and the frequency variation signal one-to-one relationship of described actual temperature difference and design temperature difference, described corresponding relation is: the difference of actual temperature difference and design temperature difference is big, the corresponding frequency variation signal that reduces the pump motor operating frequency;
Described frequency-conversion processing unit is the self-turn-off device that adopts Sine Wave Pulse Width Modulation, two kinds of mode of operations of " manually " " automatically " are arranged, the described air conditioner water circulatory system comprises chilled water, cooling water recirculation system, and the pump motor in described chilled water, the cooling water recirculation system adopts the control of one-to-one control mode by different frequency-conversion processing unit respectively;
The computing unit that described CPU is made up of temperature comparator, PLC and PID adjuster, it is poor to be provided with described design temperature in the described temperature comparator.
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| CN2008101421996A CN101363654B (en) | 2008-09-11 | 2008-09-11 | Power-saving device of central air-conditioning |
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| US11549713B2 (en) * | 2018-02-01 | 2023-01-10 | Ademco Inc. | Universal wireless HVAC controller with an internally stored infrared (IR) database |
| CN109000334A (en) * | 2018-06-29 | 2018-12-14 | 广州能迪能源科技股份有限公司 | A kind of preparation method of water chilling unit energy-saving control strategy |
| CN117029370B (en) * | 2023-10-10 | 2024-01-26 | 上海阿波罗机械股份有限公司 | Method for controlling a circulating water system of a nuclear power plant |
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