阅读说明：本技术 一种变参量冷却塔组节能自动控制系统及控制方法 (Variable parameter cooling tower set energy-saving automatic control system and control method ) 是由 刘定华 刘浩君 于 2020-12-31 设计创作，主要内容包括：本发明提供一种变参量冷却塔组节能自动控制系统,包括总控制器、气象站及若干冷却塔；气象站布置于所述冷却塔的附近,所述气象站用于检测环境的气象参数；冷却塔上设置有用于检测所述冷却塔电机的电力参数的电力检测仪表；冷却塔的冷却水出水水路上设置有温度传感器及电动二通阀,温度传感器用于检测所述冷却水的出水温度,电动二通阀用于通断所述冷却水出水水路；冷却塔、电力检测仪表、温度传感器、电动二通阀、气象站皆与所述总控制器通信连接。本发明还提供一种变参量冷却塔组节能自动控制方法。本发明可大幅提升运行效率,节约主机耗电量,具有巨大的节能效益。节能减排降耗社会效益显著。(The invention provides an energy-saving automatic control system of a variable parameter cooling tower set, which comprises a master controller, a meteorological station and a plurality of cooling towers; a weather station disposed in proximity to the cooling tower, the weather station for detecting weather parameters of an environment; the cooling tower is provided with an electric power detection instrument for detecting electric power parameters of the cooling tower motor; a cooling water outlet water channel of the cooling tower is provided with a temperature sensor and an electric two-way valve, the temperature sensor is used for detecting the outlet water temperature of the cooling water, and the electric two-way valve is used for switching on and off the cooling water outlet water channel; the cooling tower, the electric power detecting instrument, the temperature sensor, the electric two-way valve and the meteorological station are all in communication connection with the master controller. The invention also provides an energy-saving automatic control method of the variable parameter cooling tower set. The invention can greatly improve the operation efficiency, save the power consumption of the host and have great energy-saving benefit. The social benefits of energy conservation, emission reduction and consumption reduction are remarkable.)

1. An energy-saving automatic control system of a variable parameter cooling tower set is characterized by comprising a master controller, a meteorological station and a plurality of cooling towers;

the weather station is arranged near the cooling tower and is used for detecting weather parameters of the environment;

the cooling tower is provided with an electric power detection instrument for detecting electric power parameters of the cooling tower motor; a cooling water outlet water channel of the cooling tower is provided with a temperature sensor and an electric two-way valve, the temperature sensor is used for detecting the outlet water temperature of the cooling water, and the electric two-way valve is used for switching on and off the cooling water outlet water channel;

the cooling tower, the electric power detecting instrument, the temperature sensor, the electric two-way valve and the meteorological station are in communication connection with the master controller.

2. The variable parameter cooling tower set energy saving automatic control system according to claim 1, further comprising a cooling water loop; one end of the cooling water loop is communicated with a cooling water channel of the equipment to be cooled, and the other end of the cooling water loop is communicated with a cooling tower water outlet water channel of each cooling tower.

3. The variable parameter cooling tower set energy saving automatic control system according to claim 2, further comprising a flow meter disposed in the cooling water circuit; the flow meter is connected with the master controller.

4. The system of claim 1, wherein the weather station is located within a circle having a radius of less than 5 meters from the cooling tower.

5. An energy-saving automatic control method for a variable parameter cooling tower set of an energy-saving automatic control system for the variable parameter cooling tower set according to any one of claims 1-4, characterized by comprising the following steps:

the temperature sensor detects the water outlet temperature of the cooling tower and feeds the water outlet temperature back to the master controller; the weather station measures environmental weather parameters and feeds the environmental weather parameters back to the master controller; the electric power detection instrument monitors real-time electric power parameters of the motor and feeds the real-time electric power parameters back to the master controller;

presetting a cooling efficiency expert database of a cooling tower in a master controller;

and the master controller compares the actual water inlet temperature of the cooling tower, the water yield of the cooling tower and the required water outlet temperature with the cooling efficiency of the expert database according to the obtained water outlet temperature parameters, environmental meteorological parameters and electric parameters to obtain the water yield of the cooling tower with the maximum utilization rate.

6. The method of claim 5, wherein the ambient weather parameter includes one or both of a dry bulb temperature and a wet bulb temperature of ambient air.

7. The energy-saving automatic control method of the variable parameter cooling tower set according to claim 6,

calculating to obtain the optimal cooling water outlet temperature according to a wet bulb temperature and optimal cooling water outlet temperature formula, wherein the optimal cooling water outlet temperature formula is the wet bulb temperature plus 1.5-5 ℃;

the master controller obtains the water outlet quantity of each cooling tower and the water inlet temperature of each cooling tower; and the master controller calculates the cooling heat Q (cm Delta t) under the water yield of the cooling tower through the water outlet temperature, the water yield of the cooling tower and the water inlet temperature of the cooling tower, and calculates the current cooling heat value of the single cooling tower in unit time.

8. The method for automatically controlling the energy conservation of the variable parameter cooling tower set according to claim 7, further comprising the steps of:

the real-time electric parameters comprise the running power and the current of the motor;

preferred patterns included in the expert database are: rated power/real-time operation power is equal to the maximum cooling heat value per unit time/current cooling heat value;

comparing the real-time operating efficiency and current parameters of the cooling tower motor with the rated operating power and current parameters of the cooling tower motor, and if the rated operating power and current parameters are not the rated values, comparing the rated operating power and current parameters with the following parameters: obtaining the maximum cooling heat value per unit time of the cooling tower by taking the rated power/real-time running power as the maximum cooling heat value per unit time/current cooling heat value;

and determining the optimal cooling water outlet temperature, the maximum cooling heat value in unit time and the inlet water temperature, and further obtaining the corresponding maximum efficiency water outlet quantity according to Q ═ cm Delta t.

9. The method of claim 8, further comprising a cooling water circuit; one end of the cooling water loop is communicated with the water inlet of the cooling tower, and the other end of the cooling water loop is communicated with the water outlet waterway of the cooling tower of each cooling tower;

further comprising the steps of: the flow meter measures the total flow of the cooling water in real time and feeds the total flow of the cooling water back to the master controller;

when the maximum efficiency water yield of each cooling tower is the same, obtaining the number of the cooling towers needing to be put into use according to the maximum efficiency water yield of each cooling tower and the total flow of cooling water; the master controller starts a corresponding number of cooling towers according to the number of the cooling towers which need to be put into use;

when the maximum efficiency water yield of each cooling tower is different, the cooling tower to be put into use is selected according to the maximum efficiency water yield and the total cooling water flow of each cooling tower, and the total control controls the cooling towers to be put into use.

10. The method of claim 9, further comprising the steps of: and obtaining the running frequency of the cooling tower by adopting a PID algorithm according to the optimal cooling water outlet temperature, and controlling the running of a motor of the cooling tower by the master controller according to the running frequency.

Technical Field

The invention relates to the technical field of energy conservation of central air conditioners, in particular to an energy-saving automatic control system and a control method for a variable parameter cooling tower set.

Background

At present, according to the regulations in the standard design working condition of the cooling tower manufacturing standard GB7190.1-1997 5.1.1 of the central air conditioner, when the wet bulb temperature is 28 ℃, the water inlet temperature is 37 ℃, the water outlet temperature is 32 ℃, and the cooling temperature difference is 5 ℃, so that when the wet bulb temperature is 28 ℃, the water outlet temperature is 32 ℃, the water outlet temperature is qualified, and the difference between the water outlet temperature and the wet bulb temperature is 4 ℃. However, according to the annual running data analysis of the cooling tower of practical projects, the annual wet bulb temperature is not constant at 28 ℃, the maximum value is about 28 ℃, and the minimum wet bulb temperature in the air conditioning season reaches 20 ℃.

Because the traditional control technology of the cooling tower fan with fixed temperature setting is adopted, the water outlet temperature of the constant cooling tower is about 30-32 ℃, the natural climate advantage condition when the outdoor wet bulb temperature is lower than 28 ℃ cannot be deeply utilized, so that the cooling capacity of the cooling tower cannot be sufficiently utilized, and the overall working efficiency is reduced.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention provides an energy-saving automatic control system of a variable parameter cooling tower set, which can utilize environmental advantage conditions and improve the utilization rate of a cooling tower.

The second purpose of the invention is to provide an energy-saving automatic control method for the variable parameter cooling tower set.

In order to solve the technical problems, the following technical scheme is adopted:

an energy-saving automatic control system of a variable parameter cooling tower set comprises a master controller, a meteorological station and a plurality of cooling towers;

the weather station is arranged near the cooling tower and is used for detecting weather parameters of the environment;

the cooling tower is provided with an electric power detection instrument for detecting electric power parameters of the cooling tower motor; a cooling water outlet water channel of the cooling tower is provided with a temperature sensor and an electric two-way valve, the temperature sensor is used for detecting the outlet water temperature of the cooling water, and the electric two-way valve is used for switching on and off the cooling water outlet water channel;

the cooling tower, the electric power detecting instrument, the temperature sensor, the electric two-way valve and the meteorological station are in communication connection with the master controller.

Preferably, the system also comprises a cooling water loop; one end of the cooling water loop is communicated with a cooling water channel of the equipment to be cooled, and the other end of the cooling water loop is communicated with a cooling tower water outlet water channel of each cooling tower.

Preferably, the cooling water system further comprises a flow meter, wherein the flow meter is arranged in the cooling water loop; the flow meter is connected with the master controller.

Preferably, the weather station is located within a circumferential range having a radius of less than 5 meters from the cooling tower.

The variable parameter cooling tower set energy-saving automatic control method of the variable parameter cooling tower set energy-saving automatic control system according to the claim, characterized by comprising the following steps:

the temperature sensor detects the water outlet temperature of the cooling tower and feeds the water outlet temperature back to the master controller; the weather station measures environmental weather parameters and feeds the environmental weather parameters back to the master controller; the electric power detection instrument monitors real-time electric power parameters of the motor and feeds the real-time electric power parameters back to the master controller;

presetting a cooling efficiency expert database of a cooling tower in a master controller;

and the master controller compares the actual water inlet temperature of the cooling tower, the water yield of the cooling tower and the required water outlet temperature with the cooling efficiency of the expert database according to the obtained water outlet temperature parameters, environmental meteorological parameters and electric parameters to obtain the water yield of the cooling tower with the maximum utilization rate.

Preferably, the ambient weather parameters include one or both of dry bulb temperature and wet bulb temperature of ambient air

Preferably, the optimal cooling water outlet temperature is obtained by calculation through a wet bulb temperature and optimal cooling water outlet temperature formula, wherein the optimal cooling water outlet temperature formula is the wet bulb temperature plus 1.5-5 ℃;

the master controller obtains the water outlet quantity of each cooling tower and the water inlet temperature of each cooling tower; the master controller calculates and obtains the cooling heat Q (equal to cm Delta t) under the water yield of the cooling tower through the water yield temperature, the water yield of the cooling tower and the water inlet temperature of the cooling tower, and calculates and obtains the current cooling heat value of the single cooling tower in unit time;

preferably, the method further comprises the following steps:

the real-time electric parameters comprise the running power and the current of the motor;

preferred patterns included in the expert database are: rated power/real-time operation power is equal to the maximum cooling heat value per unit time/current cooling heat value;

comparing the real-time operating efficiency and current parameters of the cooling tower motor with the rated operating power and current parameters of the cooling tower motor, and if the rated operating power and current parameters are not the rated values, comparing the rated operating power and current parameters with the following parameters: obtaining the maximum cooling heat value per unit time of the cooling tower by taking the rated power/real-time running power as the maximum cooling heat value per unit time/current cooling heat value;

and determining the optimal cooling water outlet temperature, the maximum cooling heat value in unit time and the inlet water temperature, and further obtaining the corresponding maximum efficiency water outlet quantity according to Q ═ cm Delta t.

Preferably, the system also comprises a cooling water loop; one end of the cooling water loop is communicated with the water inlet of the cooling tower, and the other end of the cooling water loop is communicated with the water outlet waterway of the cooling tower of each cooling tower;

further comprising the steps of: the flow meter measures the total flow of the cooling water in real time and feeds the total flow of the cooling water back to the master controller;

when the maximum efficiency water yield of each cooling tower is the same, obtaining the number of the cooling towers needing to be put into use according to the maximum efficiency water yield of each cooling tower and the total flow of cooling water; the master controller starts a corresponding number of cooling towers according to the number of the cooling towers which need to be put into use;

when the maximum efficiency water yield of each cooling tower is different, the cooling tower to be put into use is selected according to the maximum efficiency water yield and the total cooling water flow of each cooling tower, and the total control controls the cooling towers to be put into use.

Preferably, the method further comprises the following steps: and obtaining the running frequency of the cooling tower by adopting a PID algorithm according to the optimal cooling water outlet temperature, and controlling the running of a motor of the cooling tower by the master controller according to the running frequency.

Based on the technical scheme, the invention has the following beneficial effects:

the invention dynamically calculates the cooling tower outlet water temperature with the best efficiency aiming at different cooling tower performances by using the outdoor wet bulb temperature as the basis and combining the expert database in the system, and maximally reduces the cooling tower outlet water temperature above the lowest cooling water temperature of the host machine, thereby realizing that the cooling tower outlet water temperature is close to the wet bulb temperature, reducing the cooling tower outlet water temperature, greatly improving the operating efficiency of the air conditioner host machine, saving the power consumption and having huge energy-saving benefits. The social benefits of energy conservation, emission reduction and consumption reduction are remarkable.

Drawings

FIG. 1 is a schematic diagram of an energy-saving automatic control system for a variable parameter cooling tower set according to the present invention.

Fig. 2 is a partially enlarged view of a portion a.

Wherein:

1-a master controller; 2-a cooling tower; 21-a cooling water outlet waterway; 22-cooling water circuit; 24-a water tank; 3-a weather station; 4-an electric two-way valve; and 5, a flow meter.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments and the accompanying drawings.

The invention relates to an energy-saving automatic control system of a variable parameter cooling tower set, which comprises a master controller, a plurality of cooling towers, a meteorological station and a cooling water loop.

The meteorological station is arranged in the range with the cooling tower as the center of a circle and the radius of less than 5 m; the weather station is used for detecting weather parameters of the environment.

And the cooling tower is provided with an electric power detection instrument for detecting electric power parameters of the cooling tower, wherein the electric power parameters comprise running power, current and the like.

A cooling water outlet water path of the cooling tower is provided with a temperature sensor and an electric two-way valve; the temperature sensor is used for detecting the water outlet temperature of the cooling water, and the electric two-way valve is used for switching on and off the cooling water outlet waterway.

One end of the cooling water loop is communicated with a cooling water path of the equipment to be cooled, and the other end of the cooling water loop is communicated with a cooling tower water outlet water path of each cooling tower. A flowmeter is arranged on the cooling water loop.

The cooling tower, the electric power detecting instrument, the temperature sensor, the electric two-way valve and the meteorological station are all in communication connection with the master controller.

The invention relates to a variable parameter cooling tower set energy-saving automatic control method of a variable parameter cooling tower set energy-saving automatic control system, which comprises the following steps:

and a temperature sensor of the cooling water channel detects the water outlet temperature of the cooling tower and feeds the water outlet temperature back to the master controller.

The weather station measures environmental weather parameters and feeds the environmental weather parameters back to the master controller; the ambient weather parameters include dry bulb temperature, wet bulb temperature, and relative humidity of ambient air.

The electric power detection instrument monitors real-time electric power parameters of the motor and feeds the real-time electric power parameters back to the master controller. The electrical parameters include the operating power and current of the motor.

The flow meter measures the total flow of the cooling water in real time and feeds back the total amount of the cooling water to the master controller.

In the master controller, a cooling efficiency expert database of the cooling tower is preset, wherein the preferred modes included in the expert database are: rated power/real-time operation power is the maximum cooling heat value per unit time/current cooling heat value.

The master controller obtains the water outlet quantity of each cooling tower and the water inlet temperature of the cooling tower (the water outlet quantity of each cooling tower can be measured by arranging a flowmeter on a single cooling tower; the main controller can obtain the current cooling heat quantity (Q is cm delta t) under the specific water outlet quantity through the water outlet temperature, the water outlet quantity of the cooling tower and the water inlet temperature of the cooling tower; finally, the current cooling heat value of a single cooling tower in unit time can be obtained.

Obtaining the optimal cooling water outlet temperature through a wet bulb temperature and optimal cooling water outlet temperature formula, wherein the optimal cooling water outlet temperature formula is the wet bulb temperature plus 1-5 ℃; and (4) according to the actual situation (considering the acceptable lowest temperature value of the equipment needing temperature reduction), waiting for the optimal cooling water outlet temperature based on an optimal cooling water outlet temperature formula. The temperature is close to the wet bulb temperature, and is the optimal value trend of the optimal cooling water outlet temperature.

According to the operation efficiency and the current parameter of the cooling tower motor, the rated operation power and the current parameter of the cooling tower motor, if the operation efficiency and the current parameter are not rated values, the rated operation power and the current parameter can be compared with the optimal mode of the cooling efficiency expert database (the rated power/the real-time operation power is the largest cooling heat value per unit time/the current cooling heat value), and the largest cooling heat value per unit time of the cooling tower can be obtained (the rated power/the real-time operation power is the largest cooling heat value per unit time/the current cooling heat value).

Determining the optimal cooling water outlet temperature, the maximum cooling heat value in unit time and the water inlet temperature, and further obtaining the corresponding maximum efficiency water outlet quantity according to Q ═ cm delta t;

when the maximum efficiency water yield of each cooling tower is the same, obtaining the number of the cooling towers needing to be put into use according to the maximum efficiency water yield of each cooling tower and the total flow of cooling water; the master controller starts a corresponding number of cooling towers according to the number of the cooling towers which need to be put into use; the master controller controls the opening of the motor of the cooling tower to be started and the electric two-way valve arranged on the motor to enable the motor to run at rated power.

When the maximum efficiency water yield of each cooling tower is different, the cooling tower to be used is selected according to the maximum efficiency water yield and the total cooling water flow of each cooling tower, the cooling towers are controlled to be used by the master controller, the motor of the cooling tower to be started and the electric two-way valve arranged on the motor are controlled to be opened by the master controller, and the motor is enabled to run at rated power.

In order to better regulate the operation of the motor, one of the control modes is as follows: and obtaining the running frequency of the cooling tower by adopting a PID algorithm, and controlling the running of a motor of the cooling tower by the master controller according to the running frequency.

The invention integrates the number of cooling towers, the operating power of the motor of the cooling tower and the variable parameter automatic control of the water outlet temperature into a whole, utilizes the water outlet temperature sensor data of each cooling tower and the current meteorological parameters, combines the optimal cooling capacity of the cooling tower of an expert database, realizes the control of the cooling water outlet temperature by the variable parameter of the dynamic meteorological parameters, and realizes the optimal cooling effect with better cooling cost. Realize that cooling tower outlet water temperature is close to wet bulb temperature, reduce cooling tower outlet water temperature, effective quick reduction host computer heat to can promote host computer operating efficiency by a wide margin, practice thrift host computer power consumption, have huge energy-conserving benefit.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention will still fall within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.