CN115355731B - Energy-saving control device and control method for cooling tower - Google Patents
Energy-saving control device and control method for cooling tower Download PDFInfo
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- CN115355731B CN115355731B CN202210998956.XA CN202210998956A CN115355731B CN 115355731 B CN115355731 B CN 115355731B CN 202210998956 A CN202210998956 A CN 202210998956A CN 115355731 B CN115355731 B CN 115355731B
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- 238000001816 cooling Methods 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 219
- 239000000498 cooling water Substances 0.000 claims abstract description 137
- 238000005265 energy consumption Methods 0.000 claims abstract description 34
- 238000004378 air conditioning Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioner refrigeration, in particular to an energy-saving control device and a control method of a cooling tower, comprising the following steps: the system comprises a meteorological parameter acquisition module, a temperature acquisition module, a flow acquisition module, an ammeter acquisition module, an execution module and a control module; the meteorological parameter acquisition module is used for acquiring wet bulb temperature data of the environment where the cooling tower is located; the temperature acquisition module is used for acquiring temperature data of chilled water and cooling water of the water chilling unit; the flow acquisition module is used for acquiring flow data of chilled water and cooling water outlet of the water chiller; the ammeter acquisition module is used for acquiring instantaneous power data of the cooling tower and the water chilling unit; the execution module is used for controlling the start and stop of the cooling tower; the control module is used for receiving the collected data, calculating the data and sending a control instruction. The invention can relate the energy consumption relation between the water chilling unit and the cooling tower, and control the start and stop of the cooling tower based on the energy consumption relation, so that the air conditioning system can operate under the lowest energy consumption, thereby achieving the aim of energy saving.
Description
Technical Field
The invention relates to the technical field of air conditioning refrigeration, in particular to an energy-saving control device and method of a cooling tower.
Background
The cooling tower adopts the working principle of heat exchange of hot water and cold air, and mainly utilizes a motor to drive a fan so that cooling water is fully contacted with air, and heat is emitted into the air in the modes of evaporation heat transfer and convection heat transfer, so that the aim of cooling is fulfilled. The operation mode of the cooling tower relates to the refrigerating effect of the water chilling unit and the energy consumption of the whole air conditioning system.
The operation mode of the existing cooling tower is divided into fixed-frequency operation and variable-frequency operation according to whether the fan frequency is adjustable, and the variable-frequency cooling tower is adopted in actual life, mainly because the fixed-frequency operation cooling tower cannot flexibly adapt to various working conditions and cannot control energy consumption by changing the operation frequency, but the fixed-frequency operation cooling tower has the advantages of simple control mode and convenient operation and maintenance management compared with the variable-frequency cooling tower, the fixed-frequency operation cooling tower still has wide application, and the fixed-frequency operation cooling tower is improved on the basis, so that the use energy consumption of the fixed-frequency operation cooling tower is reduced.
At present, a cooling tower running at fixed frequency has stronger coupling with a water chilling unit in the actual running process; if the energy saving problem of the cooling tower is considered independently, the control strategy should be as few as possible to start the cooling tower, but the strategy may cause the water outlet temperature of the water chilling unit to be higher, so that the energy consumption of the water chilling unit is increased; if the energy saving problem of the water chilling unit is considered separately, the temperature of the cooling water entering the water chilling unit should be as low as possible under the requirement of ensuring the safe operation of the water chilling unit, and the reduction of the temperature of the cooling water inevitably leads to the increase of the energy consumption of the cooling tower, so that the balance point is difficult to find in the prior art, and the start-stop number cannot be controlled reasonably.
Disclosure of Invention
The invention provides an energy-saving control device and a control method of a cooling tower, which are used for improving the problem of high energy consumption caused by the fact that the number of start-stop stations cannot be flexibly controlled according to actual working conditions of the cooling tower of the conventional fixed-frequency air conditioner refrigerating system.
The energy-saving control device for a cooling tower provided by the first aspect of the invention comprises: the system comprises a meteorological parameter acquisition module, a temperature acquisition module, a flow acquisition module, an ammeter acquisition module, a control module and an execution module;
the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module, the ammeter acquisition module and the execution module are respectively connected with the control module;
the meteorological parameter acquisition module is used for acquiring wet bulb temperature data of the environment where the cooling tower is located;
The temperature acquisition module is used for acquiring temperature data of chilled water and cooling water of the air conditioner water chilling unit;
The flow acquisition module is used for acquiring flow data of chilled water and cooling water outlet of the air conditioner water chilling unit;
the ammeter acquisition module is used for acquiring instantaneous power data of the cooling tower and instantaneous power data of the water chilling unit;
the control module is used for receiving data acquired by the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module and the electric meter acquisition module, calculating the acquired data and outputting a cooling tower control instruction based on a calculation result;
and the execution module is used for executing start-stop operation on the cooling tower according to the cooling tower control instruction.
Specifically, the control module includes: the device comprises a data transmission module, a calculation module and a control output module;
The data transmission module is used for receiving the data acquired by the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module and the ammeter acquisition module and sending the data to the calculation module;
the calculation module is used for calculating the acquired data and outputting a cooling tower control instruction based on a calculation result;
The control output module is used for receiving the control instruction of the calculation module and sending the control instruction to the execution module.
Specifically, the calculation module is configured to calculate the collected data, and output a cooling tower control instruction based on a calculation result, where the calculation module specifically includes:
The calculation module is used for calculating the energy consumption of the water chilling unit according to wet bulb temperature data of the environment where the cooling tower is located, chilled water and cooling water temperature data of the air conditioning water chilling unit and chilled water and cooling water outlet flow data of the air conditioning water chilling unit, comparing the energy consumption of the cooling tower with instantaneous power data of the water chilling unit, judging whether one cooling tower needs to be turned on or turned off more according to a comparison result, and outputting the cooling tower control instruction when the judgment result is yes.
Specifically, the meteorological parameter acquisition module is used for acquiring wet bulb temperature data of the environment where the cooling tower is located, and specifically comprises the following steps:
The meteorological parameter acquisition module is connected with the temperature and humidity sensor and is used for acquiring the wet bulb temperature data detected by the temperature and humidity sensor.
Specifically, the temperature acquisition module is used for acquiring data of chilled water and cooling water temperature of an air conditioner water chilling unit, and specifically comprises the following steps:
the temperature acquisition module is connected with a chilled water inlet temperature sensor and is used for acquiring chilled water inlet temperature data of the air conditioner water chilling unit;
the temperature acquisition module is connected with the chilled water outlet temperature sensor and is used for acquiring chilled water outlet temperature data of the air conditioner water chilling unit;
The temperature acquisition module is connected with a cooling water inlet temperature sensor and is used for acquiring cooling water inlet temperature data of the air conditioner water chilling unit;
the temperature acquisition module is connected with a cooling water outlet temperature sensor and is used for acquiring cooling water outlet temperature data of the air conditioner water chilling unit.
Specifically, the flow acquisition module is used for acquiring chilled water and cooling water outlet flow data of the air conditioner water chilling unit, and specifically comprises the following steps:
the flow acquisition module is connected with a chilled water outlet flow sensor and is used for acquiring chilled water outlet flow of the air conditioner water chilling unit;
The flow acquisition module is connected with a cooling water outlet flow sensor and is used for acquiring the cooling water outlet flow of the air conditioner water chilling unit.
Specifically, the ammeter acquisition module is used for acquiring instantaneous power data of a cooling tower and instantaneous power data of a water chilling unit, and specifically comprises the following steps:
The ammeter acquisition module is respectively connected with the cooling tower and a circuit of the water chilling unit and is used for acquiring instantaneous power data of the cooling tower and the water chilling unit.
Specifically, the execution module includes: cooling water enters tower motorised valve, cooling water and goes out tower motorised valve and fan start-stop control ware, wherein:
the cooling water inlet tower electric valve is arranged at the cooling water inlet pipeline, and the cooling water outlet tower electric valve is arranged at the cooling water outlet pipeline.
The invention also provides an energy-saving control method, which comprises the following steps:
S1: calculating the outlet water temperature of the cooling water of one cooling tower and the return water temperature of the cooling water of one cooling tower at least according to the obtained wet bulb temperature of the environment where the cooling tower is positioned, the cooling water temperature of the air conditioner water chilling unit and the outlet water flow of the cooling water of the air conditioner water chilling unit;
S2: calculating the refrigerating capacity of the water chilling unit for increasing the cooling tower according to the backwater temperature of the cooling water of the cooling tower, the outlet water flow of the chilled water of the air conditioning water chilling unit and the chilled water temperature of the air conditioning water chilling unit;
calculating the refrigerating capacity of the water chilling unit with one cooling tower less according to the cooling water backwater temperature of the cooling tower with one cooling tower less, the chilled water outlet flow of the water chilling unit of the air conditioner and the chilled water temperature of the water chilling unit of the air conditioner;
S3: calculating the energy efficiency of the water chilling unit when the cooling tower is started according to the refrigerating capacity of the water chilling unit and the instantaneous power of the water chilling unit;
calculating the energy efficiency of the water chilling unit when one cooling tower is opened less according to the refrigerating capacity of the water chilling unit which is opened less by one cooling tower;
S4: calculating the energy consumption of the water chilling unit according to a preset rule according to the instantaneous power of the water chilling unit, the energy efficiency of the water chilling unit, the refrigerating capacity of the water chilling unit, the return water temperature of cooling water when a cooling tower is opened and the return water temperature of cooling water in the original running state;
Calculating the energy consumption of the water chilling unit according to a preset rule according to the instantaneous power of the water chilling unit, the energy efficiency of the water chilling unit, the refrigerating capacity of the water chilling unit, the return water temperature of the cooling water when one cooling tower is opened less and the return water temperature of the cooling water when the water chilling unit is in an original running state;
S5: when a cooling tower is increased, judging whether the energy consumption of the unit is larger than the instantaneous power of the cooling tower, if so, controlling an execution module to increase the cooling tower, and if not, keeping the original running state;
when one cooling tower is opened, judging whether the energy consumption of the unit is smaller than the instantaneous power of the cooling tower, if so, controlling the execution module to open one cooling tower, otherwise, keeping the original running state.
Specifically, the preset principle is as follows:
the water inlet temperature of the cooling water is reduced by 1 ℃, and the energy efficiency of the unit is improved by 1.5%.
The energy-saving control device and the control method for the cooling tower have the beneficial effects that the environmental temperature around the cooling tower can be collected through the meteorological parameter collection module, the chilled water and the cooling water temperature of the cooling water unit can be collected through the temperature collection module, the chilled water and the cooling water flow of the cooling water unit can be collected through the flow collection module, the instantaneous power of the cooling tower and the cooling water unit can be collected through the electric meter collection module, then the influence of the data of each collection module on the start and stop of the cooling tower is comprehensively considered through the control module, the energy consumption relation between the cooling water unit and the cooling tower can be related, an optimal balance point can be found, the start and stop of the cooling tower can be further controlled, and the running number of the cooling tower is always controlled within a reasonable range aiming at the lowest energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a frame construction diagram of a cooling tower energy saving control device;
FIG. 2 is a detailed frame construction diagram of a cooling tower energy saving control device;
FIG. 3 is a block diagram of an air conditioning water system of a cooling tower energy saving control device;
FIG. 4 is a flow chart of a cooling tower energy saving control method;
description of the reference numerals:
1-a chilled water outlet flow sensor; 2-chilled water outlet temperature sensor; 3-chilled water inlet temperature sensor; 4-a water chilling unit; 5-a cooling water outlet temperature sensor; 6-a cooling water outlet flow sensor and 7-a cooling water inlet temperature sensor; 8-a cooling water pump; 9-cooling water enters the tower electric valve; 10-a fan start-stop controller; 11-cooling water outlet tower electric valve; 12-a temperature and humidity sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present embodiment provides an energy-saving control device for a cooling tower, where in the present embodiment, energy-saving control includes a meteorological parameter acquisition module, a temperature acquisition module, a flow acquisition module, an ammeter acquisition module, an execution module and a control module;
the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module, the ammeter acquisition module and the execution module are respectively connected with the control module;
wherein: the meteorological parameter acquisition module is used for acquiring wet bulb temperature data of the environment;
The temperature acquisition module is used for acquiring temperature data of chilled water and cooling water of the air conditioner water chilling unit;
the flow acquisition module is used for acquiring flow data of chilled water and cooling water outlet of the air conditioner water chilling unit;
The ammeter acquisition module is used for acquiring instantaneous power data of the cooling tower and instantaneous power data of the water chilling unit;
the control module is used for receiving the data acquired by the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module and the ammeter acquisition module, calculating the acquired data and outputting a cooling tower control instruction based on a calculation result;
and the execution module is used for executing start-stop operation on the cooling tower according to the cooling tower control instruction.
According to the energy-saving control device for the cooling tower, the collected various data are sent to the control module by collecting the wet bulb temperature of the surrounding environment, the temperature of the chilled water and the cooling water, the water outlet flow of the chilled water and the cooling water and the instantaneous power data of the cooling tower and the cooling water unit, the energy consumption of the cooling water unit after one cooling tower is increased or one cooling tower is reduced is calculated in the control module according to the collected data, the control strategy with the lowest energy consumption of an air conditioning system under the condition of ensuring normal refrigeration is determined based on the energy consumption and the instantaneous power of the cooling tower, and after a control instruction is output through the control module, the execution module executes start-stop operation on the cooling tower, so that the purpose of saving energy consumption is finally achieved.
In the specific implementation process, a monitoring platform is arranged outside the energy-saving control device, data interaction is kept between the energy-saving control device and the cooling tower in real time during operation, the operation of the cooling tower is monitored, and the control module is also in communication connection with the external monitoring platform, so that the remote monitoring of the operation condition of the cooling tower is realized.
In a more specific embodiment of the present invention, please refer to fig. 2;
In this embodiment, the control module specifically includes a data transmission module, a control output module, a calculation module, and a communication module;
The data transmission module is used for receiving data acquired by the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module and the ammeter acquisition module and sending the acquired data to the calculation module;
The control output module is used for outputting a control instruction of the calculation module to the execution module and controlling the execution module to execute instruction operation;
the calculation module is used for calculating the acquired data and outputting a cooling tower control instruction based on a calculation result;
the communication module is used for keeping communication between the control module and an external monitoring platform.
In a more specific embodiment, the calculating module is configured to calculate a control strategy for the optimal number of start-stop stages of the cooling tower according to the collected data, and specifically includes:
The calculation module calculates the cooling water outlet flow after one cooling tower is increased according to the existing cooling water outlet flow;
According to the collected wet bulb temperature, the cooling water inlet temperature and the cooling water outlet temperature, the cooling water outlet temperature after one cooling tower is increased is calculated and increased; meanwhile, the refrigerating capacity of the water chilling unit is calculated according to the volume of chilled water flow, the water density, the specific heat of water, the inlet temperature of chilled water and the outlet temperature of chilled water;
the energy efficiency of the water chilling unit is calculated according to the refrigerating capacity of the water chilling unit and the instantaneous power of the water chilling unit;
Calculating the energy consumption of the unit saved by increasing one cooling tower according to the instantaneous power of the water chilling unit, the refrigerating capacity of the water chilling unit, the energy efficiency of the water chilling unit, the temperature of the backwater of the cooling water and the temperature of the backwater of the cooling water;
and judging whether to add one cooling tower according to the comparison of the unit energy consumption saved by adding one cooling tower and the instantaneous power of the cooling tower.
In a more specific embodiment, the calculating module is configured to calculate a control strategy for the optimal number of start-stop stages of the cooling tower according to the collected data, and further includes:
The calculating module calculates the cooling water outlet flow after one cooling tower is opened according to the existing cooling water outlet flow;
Calculating the cooling water outlet temperature after one cooling tower is opened less according to the collected wet bulb temperature, the cooling water inlet temperature and the cooling water outlet temperature; meanwhile, the refrigerating capacity of the water chilling unit is calculated according to the volume of chilled water flow, the water density, the specific heat of water, the inlet temperature of chilled water and the outlet temperature of chilled water;
the energy efficiency of the water chilling unit is calculated according to the refrigerating capacity of the water chilling unit and the instantaneous power of the water chilling unit;
Calculating the energy consumption of the unit saved by one cooling tower less according to the instantaneous power of the water chilling unit, the refrigerating capacity of the water chilling unit, the energy efficiency of the water chilling unit, the temperature of the return water of the cooling water and the temperature of the return water of the cooling water which is one cooling tower less;
and judging whether one cooling tower is opened or not according to the comparison between the unit energy consumption saved by opening one cooling tower and the instantaneous power of the cooling tower.
In a more specific embodiment, referring to fig. 3, fig. 3 is a schematic view of an air conditioning water system of the cooling tower energy saving control device; the cooling tower energy-saving control device further includes: the cooling water outlet flow sensor 1, the cooling water outlet temperature sensor 2, the cooling water inlet temperature sensor 3, the cooling water outlet temperature sensor 5, the cooling water outlet flow sensor 6, the cooling water inlet temperature sensor 7, the cooling water pump 8, the cooling water inlet tower electric valve 9, the fan start-stop controller 10, the cooling water outlet tower electric valve 11 and the temperature and humidity sensor 12.
The chilled water outlet flow sensor 1 is arranged at the position of the chilled water outlet pipeline, the cooling water outlet flow sensor 6 is arranged at the position of the cooling water outlet pipeline, and the chilled water outlet flow sensor 1 and the cooling water outlet flow sensor 6 are connected with the flow acquisition module and are used for detecting chilled water outlet flow and cooling water outlet flow;
The chilled water outlet temperature sensor 2 is arranged at the position of the cooling water outlet pipeline, the chilled water inlet temperature sensor 3 is arranged at the position of the chilled water inlet pipeline, the cooling water outlet temperature sensor 5 is arranged at the position of the cooling water outlet pipeline, and the cooling water inlet temperature sensor 7 is arranged at the position of the cooling water inlet pipeline;
the chilled water outlet temperature sensor 2, the chilled water inlet temperature sensor 3, the cooling water outlet temperature sensor 5 and the cooling water inlet temperature sensor 7 are connected with the temperature acquisition module and are used for detecting the inlet and outlet water temperatures of the chilled water and the cooling water of the air conditioner;
The cooling water inlet tower electric valve 9 is arranged at the position of the cooling water outlet pipeline, and the cooling water outlet tower electric valve 11 is arranged at the position of the cooling water outlet pipeline;
The cooling water inlet tower electric valve 9, the fan start-stop controller 10 and the cooling water outlet tower electric valve 11 are all connected with the execution module, the cooling water inlet tower electric valve 9 is used for controlling cooling water to enter the cooling tower, the fan start-stop controller 10 is used for controlling the fan to be started and closed, and the cooling water outlet tower electric valve is used for controlling cooling water to flow out of the cooling tower;
In the specific implementation process, after the execution module obtains the instruction of the cooling tower controller, if a cooling tower needs to be newly added, the electric valve of the corresponding cooling tower should be opened first, and then the fan is opened; when one cooling tower is reduced, the fan of the cooling tower is closed first, and then the corresponding electric valve is closed.
The temperature and humidity sensor 12 is connected with the meteorological parameter acquisition module and is used for detecting wet bulb temperature data of the surrounding environment.
In another aspect, referring to fig. 4, the present invention further provides an embodiment of an energy saving control method, where the method specifically includes:
s1: the outlet water temperature of cooling water of a cooling tower is calculated, and the specific functional relation is as follows:
t0ut1＝ats+b(tin-t0ut)+cmc+d
Wherein t s is wet bulb temperature, t in is cooling water inlet temperature, t 0ut is cooling water outlet temperature, m c is cooling water outlet flow after one cooling tower is opened more, and a, b, c, d is fitting coefficient;
S2: the refrigerating capacity of the water chilling unit is calculated, and the specific functional relation is as follows:
Q＝mρc(ti-t0)
Wherein m is the outlet water flow rate of the chilled water, ρ is the density of the water, c is the specific heat of the water, t i is the inlet water temperature of the chilled water, and t 0 is the outlet water temperature of the chilled water;
S3: the energy efficiency of the computer set is as follows:
cop＝Q/W
Wherein W is the instantaneous power of the water chilling unit and is collected by an ammeter collection module;
s4: calculating the unit energy consumption Q s saved by adding one cooling tower; in the implementation process, the cooling water inlet temperature is reduced by 1 ℃, and the energy efficiency of the unit is improved by 1.5%, so that the specific functional relationship is as follows:
Qs＝W-Q/(cop+cop×(tout-tout1)×0.015)
wherein t out is the cooling water outlet temperature of the cooling tower;
s5: when a cooling tower is increased, judging whether Q s is larger than the instantaneous power of the cooling tower, if so, controlling the execution module to increase the cooling tower, otherwise, keeping the original running state;
In another specific method embodiment, further according to the data collected by the collection module, calculating energy consumption generated by the water chilling unit after one cooling tower is opened less, and comparing with instantaneous power of the cooling tower, judging whether one cooling tower can be closed to achieve the purpose of energy saving, specifically including:
X1: according to the data acquired by each acquisition module, the water outlet temperature of the cooling water of one cooling tower is calculated, and the specific functional relation is as follows:
t0ut1＝ats+b(tin-t0ut)+cmc+d
Wherein, the wet bulb temperature t s, the cooling water inlet temperature t in, the cooling water outlet temperature t 0ut, the cooling water outlet flow after one cooling tower is opened less m c, and a, b, c, d are fitting coefficients;
X2: the refrigerating capacity of the water chilling unit is calculated, and the specific functional relation is as follows:
Q＝mρc(ti-t0)
Wherein m is the outlet water flow rate of the chilled water, ρ is the density of the water, c is the specific heat of the water, t i is the inlet water temperature of the chilled water, and t 0 is the outlet water temperature of the chilled water;
x3: the energy efficiency of the computer group is as follows:
cop＝Q/W
Wherein W is the instantaneous power of the water chilling unit and is collected by an ammeter collection module;
X4: the energy consumption Q s of the unit saved by one cooling tower is calculated, and the specific functional relation is as follows:
Qs＝W-Q/(cop+cop×(tout1-tout)×0.015)
wherein t out is the cooling water outlet temperature of the cooling tower;
x5: when one cooling tower is not opened, judging whether Q s is smaller than the instantaneous power of the cooling tower, if so, controlling the execution module to open one cooling tower, otherwise, keeping the original running state;
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions, which are defined by the scope of the appended claims.
Claims (8)
1. An energy-saving control device of a cooling tower, characterized by comprising: the system comprises a meteorological parameter acquisition module, a temperature acquisition module, a flow acquisition module, an ammeter acquisition module, a control module and an execution module;
the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module, the ammeter acquisition module and the execution module are respectively connected with the control module;
the meteorological parameter acquisition module is used for acquiring wet bulb temperature data of the environment where the cooling tower is located;
The temperature acquisition module is used for acquiring temperature data of chilled water and cooling water of the air conditioner water chilling unit;
The flow acquisition module is used for acquiring flow data of chilled water and cooling water outlet of the air conditioner water chilling unit;
the ammeter acquisition module is used for acquiring instantaneous power data of the cooling tower and instantaneous power data of the water chilling unit;
the control module is used for receiving data acquired by the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module and the electric meter acquisition module, calculating the acquired data and outputting a cooling tower control instruction based on a calculation result;
the execution module is used for executing start-stop operation on the cooling tower according to the cooling tower control instruction;
the control module includes: the device comprises a data transmission module, a calculation module and a control output module;
The data transmission module is used for receiving the data acquired by the meteorological parameter acquisition module, the temperature acquisition module, the flow acquisition module and the ammeter acquisition module and sending the data to the calculation module;
the calculation module is used for calculating the acquired data and outputting a cooling tower control instruction based on a calculation result;
the control output module is used for receiving the control instruction of the calculation module and sending the control instruction to the execution module;
The calculation module is used for calculating the acquired data and outputting a cooling tower control instruction based on a calculation result, and specifically comprises the following steps:
The calculation module is used for calculating the energy consumption of the water chilling unit according to wet bulb temperature data of the environment where the cooling tower is located, chilled water and cooling water temperature data of the air conditioning water chilling unit and chilled water and cooling water outlet flow data of the air conditioning water chilling unit, comparing the energy consumption of the cooling tower with instantaneous power data of the water chilling unit, judging whether one cooling tower needs to be turned on or turned off more according to a comparison result, and outputting the cooling tower control instruction when the judgment result is yes.
2. The energy-saving control device of the cooling tower according to claim 1, wherein the meteorological parameter acquisition module is configured to acquire wet bulb temperature data of an environment in which the cooling tower is located specifically:
The meteorological parameter acquisition module is connected with the temperature and humidity sensor and is used for acquiring the wet bulb temperature data detected by the temperature and humidity sensor.
3. The energy-saving control device of the cooling tower according to claim 1, wherein the temperature acquisition module is used for acquiring data of chilled water and cooling water temperature of an air conditioner water chilling unit specifically comprises:
the temperature acquisition module is connected with a chilled water inlet temperature sensor and is used for acquiring chilled water inlet temperature data of the air conditioner water chilling unit;
the temperature acquisition module is connected with the chilled water outlet temperature sensor and is used for acquiring chilled water outlet temperature data of the air conditioner water chilling unit;
The temperature acquisition module is connected with a cooling water inlet temperature sensor and is used for acquiring cooling water inlet temperature data of the air conditioner water chilling unit;
the temperature acquisition module is connected with a cooling water outlet temperature sensor and is used for acquiring cooling water outlet temperature data of the air conditioner water chilling unit.
4. The energy-saving control device of the cooling tower according to claim 1, wherein the flow collection module is configured to collect flow data of chilled water and cooling water outlet of an air conditioner chiller, specifically:
the flow acquisition module is connected with a chilled water outlet flow sensor and is used for acquiring chilled water outlet flow of the air conditioner water chilling unit;
The flow acquisition module is connected with a cooling water outlet flow sensor and is used for acquiring the cooling water outlet flow of the air conditioner water chilling unit.
5. The energy-saving control device of a cooling tower according to claim 1, wherein the electric meter acquisition module is configured to acquire instantaneous power data of the cooling tower and instantaneous power data of a chiller, and specifically comprises:
The ammeter acquisition module is respectively connected with the cooling tower and a circuit of the water chilling unit and is used for acquiring instantaneous power data of the cooling tower and the water chilling unit.
6. The energy saving control device of a cooling tower according to claim 1, wherein the execution module includes: cooling water enters tower motorised valve, cooling water and goes out tower motorised valve and fan start-stop control ware, wherein:
the cooling water inlet tower electric valve is arranged at the cooling water inlet pipeline, and the cooling water outlet tower electric valve is arranged at the cooling water outlet pipeline.
7. The energy-saving control method of the cooling tower is characterized by comprising the following steps of:
S1: calculating the outlet water temperature of the cooling water of one cooling tower and the return water temperature of the cooling water of one cooling tower at least according to the obtained wet bulb temperature of the environment where the cooling tower is positioned, the cooling water temperature of the air conditioner water chilling unit and the outlet water flow of the cooling water of the air conditioner water chilling unit;
S2: calculating the refrigerating capacity of the water chilling unit for increasing the cooling tower according to the backwater temperature of the cooling water of the cooling tower, the outlet water flow of the chilled water of the air conditioning water chilling unit and the chilled water temperature of the air conditioning water chilling unit;
calculating the refrigerating capacity of the water chilling unit with one cooling tower less according to the cooling water backwater temperature of the cooling tower with one cooling tower less, the chilled water outlet flow of the water chilling unit of the air conditioner and the chilled water temperature of the water chilling unit of the air conditioner;
S3: calculating the energy efficiency of the water chilling unit when the cooling tower is started according to the refrigerating capacity of the water chilling unit and the instantaneous power of the water chilling unit;
calculating the energy efficiency of the water chilling unit when one cooling tower is opened less according to the refrigerating capacity of the water chilling unit which is opened less by one cooling tower;
S4: calculating the energy consumption of the water chilling unit according to a preset rule according to the instantaneous power of the water chilling unit, the energy efficiency of the water chilling unit, the refrigerating capacity of the water chilling unit, the return water temperature of cooling water when a cooling tower is opened and the return water temperature of cooling water in the original running state;
Calculating the energy consumption of the water chilling unit according to a preset rule according to the instantaneous power of the water chilling unit, the energy efficiency of the water chilling unit, the refrigerating capacity of the water chilling unit, the return water temperature of the cooling water when one cooling tower is opened less and the return water temperature of the cooling water when the water chilling unit is in an original running state;
S5: when a cooling tower is increased, judging whether the energy consumption of the unit is larger than the instantaneous power of the cooling tower, if so, controlling an execution module to increase the cooling tower, and if not, keeping the original running state;
when one cooling tower is opened, judging whether the energy consumption of the unit is smaller than the instantaneous power of the cooling tower, if so, controlling the execution module to open one cooling tower, otherwise, keeping the original running state.
8. The energy saving control method of a cooling tower according to claim 7, wherein the preset rule is:
the water inlet temperature of the cooling water is reduced by 1 ℃, and the energy efficiency of the unit is improved by 1.5%.
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