CN113465442A - Method and system for determining energy consumption of cooling tower - Google Patents
Method and system for determining energy consumption of cooling tower Download PDFInfo
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- CN113465442A CN113465442A CN202110727730.1A CN202110727730A CN113465442A CN 113465442 A CN113465442 A CN 113465442A CN 202110727730 A CN202110727730 A CN 202110727730A CN 113465442 A CN113465442 A CN 113465442A
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- 238000001816 cooling Methods 0.000 title claims abstract description 437
- 238000005265 energy consumption Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000017525 heat dissipation Effects 0.000 claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 194
- 238000004364 calculation method Methods 0.000 claims description 32
- 238000005057 refrigeration Methods 0.000 abstract description 7
- 239000000498 cooling water Substances 0.000 description 17
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- 239000006185 dispersion Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
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- 238000007710 freezing Methods 0.000 description 3
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
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Abstract
The invention relates to the technical field of refrigeration control, in particular to a method and a system for determining energy consumption of a cooling tower, and aims to solve the problems that the energy consumption of the cooling tower cannot be accurately calculated, so that the energy consumption of a cooling system deviates and the optimal running state cannot be achieved. For the purpose, the cooling tower determining method provided by the invention obtains the actual operating frequency of the fan according to the real-time heat dissipation performance utilization rate of the cooling tower, and further obtains the shaft power and the operating efficiency of the fan so as to obtain the actual motor power of the cooling tower. According to the method and the device, the actual operation frequency of the fan of the cooling tower can be obtained according to the real-time heat dissipation performance of the cooling tower, the energy consumption of the cooling tower is further accurately calculated, and the cooling system can be accurately controlled according to the energy consumption of the cooling tower, so that the cooling system works in the optimal state.
Description
Technical Field
The invention relates to the technical field of refrigeration control, in particular to a method and a system for determining energy consumption of a cooling tower.
Background
At present, a public building generally adopts a cold water system, and in order to realize more energy-saving and efficient operation of the cold water system, a refrigerating machine room control system generally performs prejudgment calculation on refrigerating operation logic and an operation scheme. For example, a refrigeration machine room comprises 4 water chilling units, 4 chilled water pumps, 4 cooling water pumps and 4 cooling towers, and when the load factor is 50%, 3 starting schemes are provided: open 2 cooling water set, open 3 cooling water set, open 4 cooling water set, in order to realize the minimum carbon operation, control system can calculate and contrast the comprehensive energy consumption of 3 kinds of schemes, in the calculation process, cooling water set is according to the load factor, chilled water leaving water temperature, cooling water temperature of intaking etc. can carry out accurate prediction, chilled water pump and cooling water pump can carry out the accurate prediction of water pump energy consumption according to water flow change, but the cooling tower receives comprehensive factors influence such as operation platform number, discharge, wet bulb temperature, cooling water business turn over water temperature, fan frequency, always can't carry out the accurate calculation to the operation energy consumption.
The energy consumption of the cooling tower is generally predicted in the industry by adopting a step calculation mode, for example, the wet bulb temperature is more than or equal to 26 ℃ and operates according to 50Hz, the wet bulb temperature is more than or equal to 22 ℃ and the wet bulb temperature is less than 26 ℃ and operates according to 40 Hz. However, the calculation mode is influenced by historical experience of manufacturers, the energy consumption difference is large in the actual operation process, and the energy consumption of the cooling tower cannot be accurately calculated. The water outlet temperature of the cooling tower, the flow of the cooling water pump and the energy consumption of the water chilling unit are further influenced, and further the deviation of the running energy consumption of the refrigeration machine room can be caused, so that the optimal running state can not be reached.
Accordingly, there is a need in the art for a new cooling tower energy consumption determination solution to address the above-mentioned problems.
Disclosure of Invention
In order to overcome the defects that the energy consumption of a cooling tower can not be accurately calculated, the energy consumption of a cooling system deviates, and the optimal operation state can not be achieved, the invention provides a method and a system for determining the energy consumption of the cooling tower.
In a first aspect, the present invention provides a method for determining energy consumption of a cooling tower, applied to a cooling system including a cooling tower and a chiller, the method including:
respectively acquiring real-time water flow and maximum water flow of a cooling tower according to the number of running cooling towers in a running state and temperature information, and acquiring the real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
acquiring the actual operating frequency of the fan of the cooling tower according to the real-time heat dissipation performance utilization rate and the maximum operating frequency of the fan of the cooling tower;
acquiring fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and rated motor power of the cooling tower, and acquiring fan operating efficiency of the cooling tower according to actual operating frequency of the fan and maximum operating frequency of the fan;
acquiring the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the number of the operation units;
and determining the energy consumption of the cooling tower according to the actual motor power.
In one embodiment of the method for determining energy consumption of a cooling tower, the step of "obtaining real-time water flow of the cooling tower according to the number of running cooling towers in a running state and temperature information" includes:
calculating the real-time water flow of the cooling tower according to the following formula according to the total heat dissipation capacity of the cooling system, the temperature difference of inlet and outlet water of the cooling tower and the number of running stations of the cooling tower:
wherein q isReal timeIs the real-time water flow, Δ T, of the cooling towerBut is provided withThe temperature difference of the inlet water and the outlet water of the cooling tower is defined, and m is the number of running cooling towers;
Qheat dissipationAn electric power corresponding to the total heat dissipation of the cooling system and
Qheat dissipation＝QCold quantity+QPower of，QCold quantityElectric power, Q, corresponding to the total cooling capacity of the cooling systemPower ofThe unit power of the water chilling unit;
and/or the like and/or,
the step of obtaining the maximum water flow of the cooling tower according to the running number and the temperature information of the cooling tower in the running state comprises the following steps:
according to the outdoor real-time wet bulb temperature, the water flow and the approximation degree attenuation coefficient of the cooling tower under the rated working condition, the maximum water flow of the cooling tower is calculated according to the following formula:
wherein q isMaximum ofIs the maximum water flow of the cooling tower, xi is the approximation degree attenuation coefficient which is a constant determined according to the difference value of the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T is the water flow of the cooling tower under the rated working conditionwIs the outdoor real-time wet bulb temperature;
and/or the like and/or,
the step of obtaining the real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow comprises the following steps:
calculating the real-time heat dissipation performance utilization rate according to the real-time water flow and the maximum water flow and the following formula:
S＝qreal time/qMaximum of
And S is the utilization rate of the real-time heat dissipation performance of the cooling tower.
In one technical solution of the above method for determining energy consumption of a cooling tower, "obtaining an actual operating frequency of a fan of the cooling tower according to the real-time heat dissipation performance utilization rate and a maximum operating frequency of the fan of the cooling tower" includes:
according to the real-time heat dissipation performance utilization rate and the maximum operation frequency of the fan, calculating the actual operation frequency of the fan according to the following formula:
F＝S×f
and F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
In one technical solution of the method for determining energy consumption of a cooling tower, the step of obtaining power of a fan shaft of the cooling tower according to the real-time heat dissipation performance utilization rate and the rated motor power of the cooling tower includes:
according to the real-time heat dissipation performance utilization rate, the rated motor power and the motor capacity reserve coefficient of the cooling tower, calculating the fan shaft power of the cooling tower according to the following formula:
k is the fan shaft power of the cooling tower, N is the rated motor power of the cooling tower, and alpha is the motor capacity reserve coefficient of the cooling tower;
and/or the like and/or,
the step of obtaining the fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency comprises the following steps:
according to the actual operating frequency of the fan and the maximum operating frequency of the fan of the cooling tower, calculating the operating efficiency of the fan of the cooling tower according to the following formula:
n＝0.9-(f-F)×0.01
and n is the fan operating efficiency of the cooling tower.
In one technical solution of the method for determining energy consumption of a cooling tower, the step of obtaining actual motor power of the cooling tower according to the fan shaft power, the fan operating efficiency and the number of operating machines includes:
calculating the actual motor power of the cooling tower according to the following formula according to the fan shaft power, the fan operation efficiency and the number of the operation machines:
wherein Q isTower with a tower bodyIs the actual motor power of the cooling tower.
In a second aspect, the present invention provides a cooling tower energy consumption determination system for use in a cooling system including a cooling tower and a chiller, the system comprising:
the heat dissipation performance utilization rate acquisition module is configured to respectively acquire real-time water flow and maximum water flow of the cooling tower according to the number of running cooling towers in a running state and temperature information, and acquire a real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
a fan actual operating frequency obtaining module configured to obtain a fan actual operating frequency of the cooling tower according to the real-time heat dissipation performance utilization rate and a fan maximum operating frequency of the cooling tower;
a fan operating efficiency obtaining module configured to obtain fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and rated motor power of the cooling tower, and obtain fan operating efficiency of the cooling tower according to the actual fan operating frequency and the maximum fan operating frequency;
an actual motor power obtaining module configured to obtain actual motor power of the cooling tower according to the fan shaft power, the fan operating efficiency and the number of operating stations;
an energy consumption determination module configured to determine an energy consumption of the cooling tower based on the actual motor power.
In one technical solution of the cooling tower energy consumption determining system, the heat dissipation performance utilization rate obtaining module includes a real-time water flow obtaining unit and/or a maximum water flow obtaining unit and/or a heat dissipation performance utilization rate calculating unit:
the real-time water flow obtaining unit is configured to calculate the real-time water flow of the cooling tower according to the following formula according to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the number of running cooling towers:
wherein q isReal timeIs the real-time water flow, Δ T, of the cooling towerBut is provided withThe temperature difference of the inlet water and the outlet water of the cooling tower is defined, and m is the number of running cooling towers;
Qheat dissipationAn electric power corresponding to the total heat dissipation of the cooling system and
Qheat dissipation＝QCold quantity+QPower of，QCold quantityElectric power, Q, corresponding to the total cooling capacity of the cooling systemPower ofThe unit power of the water chilling unit;
the maximum water flow obtaining unit is configured to calculate the maximum water flow of the cooling tower according to the following formula according to the outdoor real-time wet bulb temperature, the water flow of the cooling tower under the rated working condition and the approximation degree attenuation coefficient:
wherein q isMaximum ofIs the maximum water flow of the cooling tower, xi is the approximation degree attenuation coefficient which is a constant determined according to the difference value of the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T is the water flow of the cooling tower under the rated working conditionwIs the outdoor real-time wet bulb temperature;
the heat dissipation performance utilization rate calculation unit is configured to calculate the real-time heat dissipation performance utilization rate according to the following formula according to the real-time water flow rate and the maximum water flow rate:
S＝qreal time/qMaximum of
And S is the utilization rate of the real-time heat dissipation performance of the cooling tower.
In an embodiment of the cooling tower energy consumption determining system, the fan actual operating frequency obtaining module is further configured to calculate the fan actual operating frequency according to the following steps:
according to the real-time heat dissipation performance utilization rate and the maximum operation frequency of the fan, calculating the actual operation frequency of the fan according to the following formula:
F＝S×f
and F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
In one technical solution of the cooling tower energy consumption determining system, the fan operating efficiency obtaining module includes a shaft power obtaining unit and/or a fan operating efficiency obtaining unit:
the shaft power obtaining unit is configured to calculate the fan shaft power according to the real-time heat dissipation performance utilization rate, the rated motor power and a motor capacity reserve coefficient of the cooling tower according to the following formula:
k is the fan shaft power of the cooling tower, N is the rated motor power of the cooling tower, and alpha is the motor capacity reserve coefficient of the cooling tower;
the fan operating efficiency obtaining unit is configured to calculate the fan operating efficiency of the cooling tower according to the following formula according to the actual fan operating frequency and the maximum fan operating frequency of the cooling tower:
n＝0.9-(f-F)×0.01
and n is the fan operating efficiency of the cooling tower.
In one aspect of the above cooling tower energy consumption determination system, the energy consumption determination module is further configured to obtain the actual motor power of the cooling tower according to the following steps:
calculating the actual motor power of the cooling tower according to the following formula according to the fan shaft power, the fan operation efficiency and the number of the operation machines:
wherein Q isTower with a tower bodyIs the actual motor power of the cooling tower.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
in the technical scheme of the invention, the real-time water flow and the maximum water flow of the cooling tower are obtained according to the running number and the temperature information of the cooling tower in a running state, the real-time heat dissipation utilization rate of the cooling tower is obtained according to the real-time water flow and the maximum water flow of the cooling tower, the actual running frequency of a fan of the cooling tower is obtained according to the real-time heat dissipation utilization rate and the maximum running frequency of the fan of the cooling tower, the shaft power of the fan of the cooling tower is obtained according to the real-time heat dissipation utilization rate and the rated motor power of the cooling tower, the running efficiency of the fan of the cooling tower is obtained according to the actual running frequency of the fan and the maximum running frequency of the fan, the actual motor power of the cooling tower is obtained according to the shaft power of the fan, the running efficiency of the fan and the running number of the cooling tower, and the energy consumption of the cooling tower is determined according to the actual motor power of the cooling tower. Based on the steps, the actual operation frequency of the fan of the cooling tower can be obtained according to the real-time heat dissipation performance of the cooling tower, the energy consumption of the cooling tower is further accurately calculated, and the cooling system can be accurately controlled according to the energy consumption of the cooling tower, so that the cooling system works in the best state.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Wherein:
FIG. 1 is a schematic flow diagram of the main steps of a cooling tower energy consumption determination method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a cooling system according to an embodiment of the present invention;
FIG. 3 is a block diagram illustrating the main structure of a cooling tower energy consumption determination system according to an embodiment of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like. The term "a and/or B" denotes all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well.
At present, a cooling system usually performs prejudgment calculation of an operation logic and an operation scheme during operation, generally calculates and compares energy consumption of alternative operation schemes in order to realize low-carbon and environment-friendly operation, and selects an actual operation scheme according to a calculation and comparison result. In the process of energy consumption calculation, the water chilling unit can carry out accurate prediction according to load factor, chilled water outlet temperature, cooling water inlet temperature and the like, the chilled water pump and the cooling water pump can carry out accurate prediction of water pump energy consumption according to water flow change, but the cooling tower is influenced by comprehensive factors such as the number of running units, water flow, wet bulb temperature, cooling water inlet and outlet temperature and fan frequency, and the running energy consumption cannot be accurately calculated all the time. A step wet bulb temperature calculation method is commonly applied in the industry, for example, the wet bulb temperature is more than or equal to 26 ℃ and operates according to 50Hz, and the wet bulb temperature is more than or equal to 22 ℃ and less than 26 ℃ and operates according to 40 Hz. However, the energy consumption calculation result of the cooling tower obtained by the method is obtained only by experience, and the difference from the actual operation is large, so that the operation energy consumption of the whole cooling system deviates, and the cooling system cannot be operated in the optimal operation state.
In an embodiment of the present invention, a method for determining energy consumption of a cooling tower is provided to solve the above problems.
Referring to FIG. 1, FIG. 1 is a schematic flow chart of the main steps of a cooling tower energy consumption determination method according to an embodiment of the present invention. Fig. 1 shows a method for determining energy consumption of a cooling tower according to an embodiment of the present invention, which is applied to a cooling system including a cooling tower and a chiller, and fig. 2 shows a schematic diagram of a cooling system according to an embodiment of the present invention, where the cooling system includes a cooling tower, a cooling water pump, a magnetic suspension chiller and a chilled water pump. The magnetic suspension water chilling unit controls water to enter the cooling tower for cooling, and cooling water output by the cooling tower enters the cooling water pump and then returns to the magnetic suspension water chilling unit through the cooling water pump. Meanwhile, the magnetic suspension water chilling unit also controls water to enter the load side, and the water flowing through the load side is frozen by the freezing water pump and then returns to the magnetic suspension water chilling unit. The method for determining the energy consumption of the cooling tower in the embodiment comprises the following steps:
step S101: and respectively acquiring the real-time water flow and the maximum water flow of the cooling tower according to the number of running cooling towers in a running state and the temperature information, and acquiring the real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow.
In this embodiment, the real-time water flow and the maximum water flow of the cooling tower are obtained according to the number of operating cooling towers in an operating state and the temperature information, and further the real-time heat dissipation performance utilization rate of the cooling tower is obtained according to the real-time water flow and the maximum water flow of the cooling tower.
Step S102: and acquiring the actual operating frequency of the fan of the cooling tower according to the real-time heat dispersion utilization rate and the maximum operating frequency of the fan of the cooling tower.
In this embodiment, the actual operating frequency of the fan of the cooling tower is obtained according to the real-time heat dissipation performance utilization rate and the maximum operating frequency of the fan of the cooling tower, which are obtained in step S101.
Step S103: and obtaining the fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and the rated motor power of the cooling tower, and obtaining the fan operating efficiency of the cooling tower according to the actual operating frequency of the fan and the maximum operating frequency of the fan.
In this embodiment, the fan shaft power of the cooling tower is obtained according to the implementation heat dissipation performance utilization rate and the rated motor power of the cooling tower obtained in step S101, and the fan operating efficiency of the cooling tower is obtained according to the actual operating frequency and the maximum operating frequency of the fan obtained in step S102.
Step S104: and acquiring the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the number of the operating machines.
In the present embodiment, the actual motor power of the cooling tower is acquired from the fan shaft power and the fan operating efficiency acquired in step S103 and the number of operating cooling towers.
Step S105: and determining the energy consumption of the cooling tower according to the actual motor power.
In the present embodiment, the energy consumption for cooling is determined based on the actual motor power of the cooling tower obtained in step S104.
Based on the steps S101 to S105, the embodiment of the present invention obtains the real-time water flow and the maximum water flow of the cooling tower according to the number of operating cooling towers in the operating state and the temperature information, and the real-time heat dispersion utilization rate of the cooling tower is obtained according to the real-time water flow and the maximum water flow of the cooling tower, obtaining the actual operating frequency of the fan of the cooling tower according to the real-time heat dispersion utilization rate and the maximum operating frequency of the fan of the cooling tower, and obtaining the fan shaft power of the cooling tower according to the real-time heat dispersion utilization rate and the rated motor power of the cooling tower, and obtaining the fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency, further obtaining the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the number of the cooling towers, and determining the energy consumption of the cooling tower according to the actual motor power of the cooling tower. Based on the steps, the actual operation frequency of the fan of the cooling tower can be obtained according to the real-time heat dissipation performance of the cooling tower, the energy consumption of the cooling tower is further accurately calculated, and the cooling system can be accurately controlled according to the energy consumption of the cooling tower, so that the cooling system works in the best state.
The above steps S101-S104 are further explained below.
In one implementation manner of step S101 in the embodiment of the present invention, step S101 may include the following steps:
calculating the real-time water flow of the cooling tower according to the following formula (1) according to the total heat dissipation capacity of the cooling system, the temperature difference of inlet and outlet water of the cooling tower and the number of running cooling towers:
the meaning of each parameter in formula (1) is: q. q.sReal timeIs the real-time water flow, Δ T, of the cooling towerBut is provided withThe temperature difference of inlet and outlet water of the cooling tower is shown, and m is the number of running cooling towers;
Qheat dissipationElectric power corresponding to the total heat dissipation of the cooling system, and QHeat dissipation＝QCold quantity+QPower of，QCold quantityElectric power, Q, corresponding to the total cooling capacity of the cooling systemPower ofThe unit power of the water chilling unit.
In the present embodiment, the electric power (unit: kW) corresponding to the total heat dissipation amount of the cooling system is the sum of the electric power (unit: kW) corresponding to the total cooling amount of the cooling system and the unit power (unit: kW) of the chiller. Electric power, cooling tower inlet and outlet water temperature difference and cold corresponding to total heat dissipation capacity of cold supply systemThe number of running cooling towers is calculated, and the real-time water flow (unit: m) of the cooling towers is calculated3H). As an example, the temperature difference Δ T between the inlet and outlet water of the cooling towerBut is provided with＝5℃。
In one implementation manner of step S101 in the embodiment of the present invention, step S101 may include the following steps:
according to the outdoor real-time wet bulb temperature, the water flow and the approximation degree attenuation coefficient of the cooling tower under the rated working condition, the maximum water flow of the cooling tower is calculated according to the following formula (2):
the meaning of each parameter in formula (2) is: q. q.sMaximum ofIs the maximum water flow of the cooling tower, xi is an approximation degree attenuation coefficient which is a constant determined according to the difference value of the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, TwIs the outdoor real-time wet bulb temperature.
In the embodiment, the performance of the cooling tower can change in real time under the influence of the outdoor real-time wet bulb temperature, and the outdoor real-time wet bulb temperature T needs to be measured in real timew(unit: DEG C) according to the water flow q (unit: m) of the cooling tower under the rated working condition3H) and the approximation degree attenuation coefficient xi to calculate the maximum water flow of the cooling tower under the current working condition (unit: m is3H). The wet bulb temperature refers to the condition that a large amount of water is in contact with limited wet air under an adiabatic condition, the latent heat required for water evaporation completely comes from the sensible heat released by the reduction of the temperature of the wet air, and the temperature of the system is when the air in the system is saturated and the system reaches heat balance. The approximation degree is the difference between the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower. And the approximation degree attenuation coefficient xi is a constant determined according to the difference value of the outdoor real-time wet bulb temperature and the water outlet temperature of the cooling tower. For example, ξ is 1 when the degree of approximation is 4 ℃, 0.8 when the degree of approximation is 3 ℃, and 1.15 when the degree of approximation is 5 ℃.
In one example, the nominal operating condition is TwWater temperature of cooling tower at 28 deg.CThe degrees are respectively at the working condition of 37 ℃/32 ℃.
As an example, when outdoor real-time wet bulb temperature TwThe temperature of inlet water and outlet water of the cooling tower is 27 ℃, the temperature of inlet water and outlet water of the cooling tower is respectively 35 ℃/30 ℃, the approximation degree is 3 ℃, the approximation degree coefficient is 0.8, and the water flow of the cooling tower under the rated working condition is 100m3H, then q can be calculated by adopting the formula (2)Maximum of＝0.8×100×0.9528-27＝76m3/h。
In one implementation manner of step S101 in the embodiment of the present invention, step S101 may include the following steps:
calculating a real-time heat dissipation performance utilization rate according to the real-time water flow and the maximum water flow according to the following formula (3):
S＝qreal time/qMaximum of (3)
And S in the formula (3) is the real-time heat dissipation performance utilization rate of the cooling tower.
In the present embodiment, the real-time heat radiation performance utilization rate S (unit:%) of the cooling tower is calculated from the real-time water flow rate and the maximum water flow rate of the cooling tower. When S > 100%, the value of S is taken as 100%.
In one implementation manner of step S102 in the embodiment of the present invention, step S102 may include the following steps:
according to the real-time heat dissipation performance utilization rate and the maximum operation frequency of the fan, calculating the actual operation frequency of the fan according to the following formula (4):
F＝S×f (4)
the meaning of each parameter in formula (4) is: f is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
In the embodiment, the actual operating frequency (unit: Hz) of the fan is calculated according to the real-time heat dissipation performance utilization rate and the maximum operating frequency of the fan. As an example, the maximum operating frequency of the fan is 50 Hz.
In one implementation manner of step S103 in the embodiment of the present invention, step S103 may include the following steps:
according to the real-time heat dissipation performance utilization rate, the rated motor power and the motor capacity reserve coefficient of the cooling tower, calculating the fan shaft power of the cooling tower according to the following formula (5):
the meaning of each parameter in formula (5) is: k is the fan shaft power of the cooling tower, N is the rated motor power of the cooling tower, and alpha is the motor capacity reserve coefficient of the cooling tower;
in this embodiment, when the motor is used, since the fan may be overloaded during operation, the rated motor power is generally higher than the shaft power for safety, so that redundancy exists in the rated motor power of the cooling tower, the redundancy is generally expressed by a motor capacity reserve coefficient α, and the ratio of the rated motor power to the shaft power is the motor capacity reserve coefficient. And calculating the fan shaft power of the cooling tower according to the implementation heat dissipation performance utilization rate, the rated motor power and the motor capacity storage coefficient of the cooling tower. In one example, the motor capacity reserve factor α is 1.1.
In one implementation manner of step S103 in the embodiment of the present invention, step S103 may include the following steps:
calculating the fan operation efficiency of the cooling tower according to the following formula (6) according to the actual fan operation frequency and the maximum fan operation frequency of the cooling tower:
n＝0.9-(f-F)×0.01 (6)
and n in the formula (6) is the fan operation efficiency of the cooling tower.
In the embodiment, the fan operating efficiency of the cooling tower at different frequencies is different according to the fan performance, and the fan operating efficiency (unit:%) can be calculated according to the actual fan operating frequency and the maximum fan operating frequency.
In one implementation manner of step S104 in the embodiment of the present invention, step S104 may include the following steps:
calculating the actual motor power of the cooling tower according to the following formula (7) according to the fan shaft power, the fan operation efficiency and the number of the operation machines:
q in formula (7)Tower with a tower bodyIs the actual motor power of the cooling tower.
In the present embodiment, the actual motor power (unit: kW) of the cooling tower is calculated from the cooling tower fan shaft power, the fan operating efficiency, and the number of operating units.
According to the steps, the energy consumption of different cooling tower operation modes can be calculated.
As an example, the cooling system comprises 4 800RT cold water units, 4 freezing water pumps, 4 cooling water pumps and 4 cooling towers of 22.5kW, and the water flow q of the cooling towers under the rated working condition is 750m3And h, controlling the temperature difference of inlet and outlet water of the cooling tower according to 5 ℃, wherein the maximum running frequency of a fan is 50Hz, and the motor capacity storage coefficient of the cooling tower is 1.1. Wherein 800RT means 800 cold tons; the cold ton is also called freezing ton, and is a unit of refrigeration science, and the cold ton represents the refrigeration power required by 1 ton of 0 ℃ saturated water to freeze to 0 ℃ ice in 24 hours, and represents the refrigeration capacity of a water chilling unit.
When the load factor of the cooling system is 50%, the water chilling unit has 3 operation schemes, 2, 3 and 4 operation schemes are respectively performed, the calculation is performed only by taking the starting scheme for operating 2 water chilling units as an example, the calculation processes of the other two operation schemes are similar to the calculation process of the operation scheme for operating 2 water chilling units, and the details are not repeated here.
When 2 cold water units are operated, the electric power Q corresponding to the total cooling capacity of the cooling systemCold quantityIs 5627kW, the unit power Q of the water chilling unitPower of866kW, the electric power corresponding to the total heat dissipation capacity of the power system is:
Qheat dissipation＝QCold quantity+QPower of＝5627+866＝6493kW
The minimum water flow rate of the cooling tower is 30% (settable), i.e. 750 x 0.3 ═ 225m3H is used as the reference value. At this time, the number of the running cooling towers is 2, and the real-time water flow of the cooling tower is calculated by adopting the formula (1):
when the number of cooling towers is 3, qReal time＝372m3Q when the number of cooling towers is 4, qReal time＝279m3/h。
The cooling tower has 3 operation schemes, namely 2 cooling towers are operated, 3 cooling towers are operated, 4 cooling towers are operated, and calculation needs to be carried out respectively aiming at the 3 schemes, and the subsequent calculation is carried out only by taking the 3 rd cooling tower operation scheme (4 cooling towers are operated) as an example, wherein m is 4, q is qReal time＝279m3H is used as the reference value. The determination method for operating 2 cooling towers and 3 cooling tower schemes is similar to the energy consumption determination method for operating 4 cooling tower schemes, and is not described again here.
At the moment, the outdoor real-time wet bulb temperature is 27 ℃, the cooling tower approach degree is 3 ℃, and then the maximum water flow of a single cooling tower is calculated by adopting a formula (2):
further, the heat dissipation performance utilization rate of the cooling tower calculated by adopting the formula (3) is as follows:
calculating by adopting a formula (4) to obtain the actual operating frequency of the fan of the cooling tower as follows:
F＝S×f＝49％×50＝24.5Hz
the fan shaft power of the cooling tower is calculated by adopting a formula (5) as follows:
the fan operating efficiency of the cooling tower is calculated by adopting a formula (6) as follows:
n＝0.9-(f-F)×0.01＝0.9-(50-24.5)×0.01＝64.5％
calculating by adopting a formula (7) to obtain the actual motor power of the cooling tower as follows:
according to the calculation method, the calculation results of the schemes of operating 2 cooling towers and 3 cooling towers can be obtained respectively. As shown in table 1, table 1 shows the energy consumption calculation results of the cooling tower in 3 operation schemes of the cooling tower when 2 chiller units are operated, and further according to the above calculation method, the energy consumption calculation results of the cooling tower in 3 chiller units and 4 chiller units can be obtained, as shown in tables 2 and 3, table 2 shows the energy consumption calculation results of the cooling tower in 3 operation schemes of the cooling tower when 3 chiller units are operated, and table 3 shows the energy consumption calculation results of the cooling tower in 3 operation schemes of the cooling tower when 4 chiller units are operated.
Table 1: when 2 water chilling units are operated, energy consumption calculation results of cooling towers with 3 operation schemes of cooling tower
Table 2: when 3 water chilling units are operated, energy consumption calculation results of cooling towers with 3 operation schemes of cooling tower
Table 3: when 4 water chilling units are operated, energy consumption calculation results of cooling towers with 3 operation schemes of cooling tower
According to the calculation results, under the condition that the load factor of the cooling system is 50%, the optimal energy consumption effect can be realized by operating 4 cooling towers in three operation schemes of the water chilling unit. Therefore, the cooling system can be controlled to operate 4 cooling towers for frequency conversion control according to the calculation result, and the actual operation frequency of the fan of the cooling tower is finely adjusted according to the approximation degree, so that the cooling system operates in the optimal matching state. Furthermore, the energy consumption determining method for the cooling tower can realize decoupling control of the number of running water chilling units and the number of running cooling towers.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art will understand that, in order to achieve the effect of the present invention, different steps do not necessarily need to be executed in such a sequence, and they may be executed simultaneously (in parallel) or in other sequences, and these changes are all within the protection scope of the present invention.
Furthermore, the invention also provides a system for determining the energy consumption of the cooling tower.
Referring to fig. 3, fig. 3 is a block diagram of the main structure of a cooling tower energy consumption determination system according to an embodiment of the present invention. As shown in fig. 3, in this embodiment, the cooling tower energy consumption determination system is applied to a cooling system including a cooling tower and a chiller, and the cooling tower energy consumption determination system may include a heat dissipation performance utilization rate obtaining module, a fan actual operating frequency obtaining module, a fan operating efficiency obtaining module, an actual motor power obtaining module, and an energy consumption determination module. The heat dissipation performance utilization rate acquisition module can be configured to respectively acquire real-time water flow and maximum water flow of the cooling tower according to the number of running cooling towers in a running state and temperature information, and acquire a real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow. The fan actual operating frequency obtaining module can be configured to obtain the fan actual operating frequency of the cooling tower according to the real-time heat dissipation performance utilization rate and the maximum fan operating frequency of the cooling tower. The fan operation efficiency obtaining module can be configured to obtain fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and the rated motor power of the cooling tower, and obtain fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency. The actual motor power obtaining module may be configured to obtain the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the number of operating stations. The energy consumption determination module may be configured to determine the energy consumption of the cooling tower from the actual motor power.
In one embodiment, the heat dissipation performance utilization acquisition module may include a real-time water flow rate acquisition unit. The real-time water flow obtaining unit may be configured to calculate the real-time water flow of the cooling tower according to the method shown in the foregoing formula (1) according to the total heat dissipation amount of the cooling system, the temperature difference between the inlet and outlet water of the cooling tower, and the number of operating stations of the cooling tower.
In one embodiment, the heat radiation performance utilization rate acquisition module may include a maximum water flow rate acquisition unit. The maximum water flow obtaining unit may be configured to calculate the maximum water flow of the cooling tower according to the method shown in the foregoing formula (2) according to the outdoor real-time wet bulb temperature, the water flow of the cooling tower under the rated working condition, and the approximation degree attenuation coefficient.
In one embodiment, the heat dissipation performance utilization rate acquisition module may include a heat dissipation performance utilization rate calculation unit. The heat radiation performance utilization calculation unit may be configured to calculate the real-time heat radiation performance utilization according to the method shown in the foregoing formula (3) from the real-time water flow rate and the maximum water flow rate.
In one embodiment, the actual operating frequency of the wind turbine may be further configured to calculate the actual operating frequency of the wind turbine according to the following steps:
and (4) calculating the actual operating frequency of the fan according to the real-time heat dispersion utilization rate and the maximum operating frequency of the fan by the method shown in the formula (4).
In one embodiment, the fan operating efficiency acquisition module may include a shaft power acquisition unit. The shaft power obtaining unit may be configured to calculate the fan shaft power according to the method shown in the foregoing formula (5) according to the real-time heat dissipation performance utilization rate, the rated motor power, and the motor capacity reserve coefficient of the cooling tower.
In one embodiment, the fan operation efficiency acquisition module may include a fan operation efficiency acquisition unit. The fan operating efficiency obtaining unit may be configured to calculate the fan operating efficiency of the cooling tower according to the method shown in the foregoing formula (6) based on the actual operating frequency of the fan and the maximum operating frequency of the fan of the cooling tower.
In one embodiment, the energy consumption determination module may be further configured to calculate the actual motor power of the cooling tower according to the following steps:
and (4) calculating the actual motor power of the cooling tower according to the method shown in the formula (7) according to the fan shaft power, the fan operation efficiency and the number of the operating machines.
The technical principles, the solved technical problems, and the generated technical effects of the cooling tower energy consumption determining system described above are similar for implementing the embodiment of the cooling tower energy consumption determining method shown in fig. 1, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and related descriptions of the cooling tower energy consumption determining system may refer to the contents described in the embodiment of the cooling tower energy consumption determining method, and no further description is provided herein.
It will be understood by those skilled in the art that all or part of the flow of the method according to the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium and used to implement the steps of the above-described embodiments of the method when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Further, it should be understood that, since the configuration of each module is only for explaining the functional units of the apparatus of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the apparatus may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A method for determining energy consumption of a cooling tower is applied to a cooling system comprising the cooling tower and a water chilling unit, and the method comprises the following steps:
respectively acquiring real-time water flow and maximum water flow of a cooling tower according to the number of running cooling towers in a running state and temperature information, and acquiring the real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
acquiring the actual operating frequency of the fan of the cooling tower according to the real-time heat dissipation performance utilization rate and the maximum operating frequency of the fan of the cooling tower;
acquiring fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and rated motor power of the cooling tower, and acquiring fan operating efficiency of the cooling tower according to actual operating frequency of the fan and maximum operating frequency of the fan;
acquiring the actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the number of the operation units;
and determining the energy consumption of the cooling tower according to the actual motor power.
2. The method for determining the energy consumption of the cooling tower according to claim 1, wherein the step of obtaining the real-time water flow rate of the cooling tower according to the number of the cooling towers in operation and the temperature information comprises:
calculating the real-time water flow of the cooling tower according to the following formula according to the total heat dissipation capacity of the cooling system, the temperature difference of inlet and outlet water of the cooling tower and the number of running stations of the cooling tower:
wherein q isReal timeIs the real-time water flow, Δ T, of the cooling towerBut is provided withThe temperature difference of the inlet water and the outlet water of the cooling tower is defined, and m is the number of running cooling towers;
Qheat dissipationAn electric power Q corresponding to a total heat dissipation amount of the cooling systemHeat dissipation＝QCold quantity+QPower of，QCold quantityElectric power, Q, corresponding to the total cooling capacity of the cooling systemPower ofThe unit power of the water chilling unit;
and/or the like and/or,
the step of obtaining the maximum water flow of the cooling tower according to the running number and the temperature information of the cooling tower in the running state comprises the following steps:
according to the outdoor real-time wet bulb temperature, the water flow and the approximation degree attenuation coefficient of the cooling tower under the rated working condition, the maximum water flow of the cooling tower is calculated according to the following formula:
wherein q isMaximum ofIs the maximum water flow of the cooling tower, xi is the approximation degree attenuation coefficient which is a constant determined according to the difference value of the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T is the water flow of the cooling tower under the rated working conditionwIs the outdoor real-time wet bulb temperature;
and/or the like and/or,
the step of obtaining the real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow comprises the following steps:
calculating the real-time heat dissipation performance utilization rate according to the real-time water flow and the maximum water flow and the following formula:
S＝qreal time/qMaximum of
And S is the utilization rate of the real-time heat dissipation performance of the cooling tower.
3. The method for determining the energy consumption of the cooling tower according to claim 2, wherein the step of obtaining the actual operating frequency of the fan of the cooling tower according to the real-time heat dissipation performance utilization rate and the maximum operating frequency of the fan of the cooling tower comprises:
according to the real-time heat dissipation performance utilization rate and the maximum operation frequency of the fan, calculating the actual operation frequency of the fan according to the following formula:
F＝S×f
and F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
4. The method for determining the energy consumption of the cooling tower according to claim 3, wherein the step of obtaining the fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and the rated motor power of the cooling tower comprises the following steps:
according to the real-time heat dissipation performance utilization rate, the rated motor power and the motor capacity reserve coefficient of the cooling tower, calculating the fan shaft power of the cooling tower according to the following formula:
k is the fan shaft power of the cooling tower, N is the rated motor power of the cooling tower, and alpha is the motor capacity reserve coefficient of the cooling tower;
and/or the like and/or,
the step of obtaining the fan operation efficiency of the cooling tower according to the actual fan operation frequency and the maximum fan operation frequency comprises the following steps:
according to the actual operating frequency of the fan and the maximum operating frequency of the fan of the cooling tower, calculating the operating efficiency of the fan of the cooling tower according to the following formula:
n＝0.9-(f-F)×0.01
and n is the fan operating efficiency of the cooling tower.
5. The method for determining energy consumption of a cooling tower according to claim 4, wherein the step of obtaining actual motor power of the cooling tower according to the fan shaft power, the fan operation efficiency and the number of operating machines comprises:
calculating the actual motor power of the cooling tower according to the following formula according to the fan shaft power, the fan operation efficiency and the number of the operation machines:
wherein Q isTower with a tower bodyIs the actual motor power of the cooling tower.
6. A cooling tower energy consumption determination system for use in a cooling system including a cooling tower and a chiller, the system comprising:
the heat dissipation performance utilization rate acquisition module is configured to respectively acquire real-time water flow and maximum water flow of the cooling tower according to the number of running cooling towers in a running state and temperature information, and acquire a real-time heat dissipation performance utilization rate of the cooling tower according to the real-time water flow and the maximum water flow;
a fan actual operating frequency obtaining module configured to obtain a fan actual operating frequency of the cooling tower according to the real-time heat dissipation performance utilization rate and a fan maximum operating frequency of the cooling tower;
a fan operating efficiency obtaining module configured to obtain fan shaft power of the cooling tower according to the real-time heat dissipation performance utilization rate and rated motor power of the cooling tower, and obtain fan operating efficiency of the cooling tower according to the actual fan operating frequency and the maximum fan operating frequency;
an actual motor power obtaining module configured to obtain actual motor power of the cooling tower according to the fan shaft power, the fan operating efficiency and the number of operating stations;
an energy consumption determination module configured to determine an energy consumption of the cooling tower based on the actual motor power.
7. The cooling tower energy consumption determination system according to claim 6, wherein the heat dissipation performance utilization rate acquisition module comprises a real-time water flow rate acquisition unit and/or a maximum water flow rate acquisition unit and/or a heat dissipation performance utilization rate calculation unit:
the real-time water flow obtaining unit is configured to calculate the real-time water flow of the cooling tower according to the following formula according to the total heat dissipation capacity of the cooling system, the water inlet and outlet temperature difference of the cooling tower and the number of running cooling towers:
wherein q isReal timeIs the real-time water flow, Δ T, of the cooling towerBut is provided withThe temperature difference of the inlet water and the outlet water of the cooling tower is defined, and m is the number of running cooling towers;
Qheat dissipationAn electric power Q corresponding to a total heat dissipation amount of the cooling systemHeat dissipation＝QCold quantity+QPower of，QCold quantityElectric power, Q, corresponding to the total cooling capacity of the cooling systemPower ofThe unit power of the water chilling unit;
the maximum water flow obtaining unit is configured to calculate the maximum water flow of the cooling tower according to the following formula according to the outdoor real-time wet bulb temperature, the water flow of the cooling tower under the rated working condition and the approximation degree attenuation coefficient:
wherein q isMaximum ofIs the maximum water flow of the cooling tower, xi is the approximation degree attenuation coefficient which is a constant determined according to the difference value of the outdoor real-time wet bulb temperature and the outlet water temperature of the cooling tower, q is the water flow of the cooling tower under the rated working condition, and T is the water flow of the cooling tower under the rated working conditionwIs the outdoor real-time wet bulb temperature;
the heat dissipation performance utilization rate calculation unit is configured to calculate the real-time heat dissipation performance utilization rate according to the following formula according to the real-time water flow rate and the maximum water flow rate:
S＝qreal time/qMaximum of
And S is the utilization rate of the real-time heat dissipation performance of the cooling tower.
8. The cooling tower energy consumption determination system of claim 7, wherein the fan actual operating frequency acquisition module is further configured to calculate the fan actual operating frequency according to the following steps:
according to the real-time heat dissipation performance utilization rate and the maximum operation frequency of the fan, calculating the actual operation frequency of the fan according to the following formula:
F＝S×f
and F is the actual operating frequency of the fan, and F is the maximum operating frequency of the fan.
9. The cooling tower energy consumption determination system of claim 8, wherein the fan operating efficiency acquisition module comprises a shaft power acquisition unit and/or a fan operating efficiency acquisition unit:
the shaft power obtaining unit is configured to calculate the fan shaft power according to the real-time heat dissipation performance utilization rate, the rated motor power and a motor capacity reserve coefficient of the cooling tower according to the following formula:
k is the fan shaft power of the cooling tower, N is the rated motor power of the cooling tower, and alpha is the motor capacity reserve coefficient of the cooling tower;
the fan operating efficiency obtaining unit is configured to calculate the fan operating efficiency of the cooling tower according to the following formula according to the actual fan operating frequency and the maximum fan operating frequency of the cooling tower:
n＝0.9-(f-F)×0.01
and n is the fan operating efficiency of the cooling tower.
10. The cooling tower energy consumption determination system of claim 9, wherein the energy consumption determination module is further configured to obtain the actual motor power of the cooling tower according to the following steps:
calculating the actual motor power of the cooling tower according to the following formula according to the fan shaft power, the fan operation efficiency and the number of the operation machines:
wherein Q isTower with a tower bodyIs the actual motor power of the cooling tower.
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