CN104101055B - A method for controlling a water-cooled air conditioner - Google Patents

Abstract

The present invention provides a control method for water-cooled air conditioners. The specific implementation process is as follows: setting up two parts, the wind side control strategy and the water side control strategy. It is realized by adjusting the flow rate in real time through a constant temperature difference between the inlet and outlet water, and the two control principles are independent. Compared with the prior art, the control method of the water-cooled air conditioner greatly improves the stability and reliability of the water-cooled air conditioner; realizes closed-loop control and high-efficiency refrigeration of the water-cooled air conditioner, has strong practicability, wide application range, and is easy to popularize.

Description

A method for controlling a water-cooled air conditioner

technical field

The invention relates to the technical field of air conditioning and refrigeration, in particular to a highly practical control method for a water-cooled air conditioner.

Background technique

With the development of cloud computing, big data and other new technologies, the density of IT equipment is getting higher and higher, and the heat generation is getting higher and higher. Density cooling needs. Water-cooled air conditioners are increasingly becoming the first choice for high-density computer room deployment. The control strategy of most water-cooled air conditioners basically adopts a single control mode. Usually, when the cooling demand increases, keep the fan speed constant, first adjust the water flow, and then increase the fan speed to improve the cooling efficiency; When the cooling demand decreases, keep the water flow constant and reduce the fan speed first. If the fan speed adjustment has no effect, then reduce the cooling capacity by changing the fan speed. The disadvantage of this method is that the water flow and fan speed are controlled separately, resulting in very slow changes in the cooling capacity of the water-cooled air conditioner. When the power consumption of IT equipment suddenly changes, it is difficult for the water-cooled air conditioner to respond quickly; at the same time, when the cooling demand of IT equipment changes Only changing the flow rate or the fan speed will not bring about the actual energy saving effect: some people think that the cube of the fan speed is directly proportional to its power consumption, and the fan power consumption can be reduced as little as possible through the above method. In order to achieve energy saving; but they often ignore that the change of water flow often causes the power consumption of the outdoor chiller to be greatly increased, because the outdoor unit relies on the compressor to work.

Based on this, a water-cooled air conditioner control method is now provided, which is based on the method of simultaneously regulating the water flow and the fan speed, so as to realize rapid cooling of the water-cooled air conditioner, improve the safety and availability of IT equipment, and simultaneously realize energy saving and consumption reduction.

Contents of the invention

The technical task of the present invention is to solve the deficiencies of the prior art, and provide a practical and water-cooled air-conditioning control method.

The technical solution of the present invention is realized in the following manner, the specific realization process of the control method of the water-cooled air conditioner is:

Set the air side control strategy, which adjusts the fan speed in real time through the changing air supply temperature: install a temperature sensor at the air outlet of the water-cooled air conditioner to detect the temperature of the air supply air from the air conditioner, and determine whether the temperature is equal to the normal working temperature of the water-cooled air conditioner. Set the working temperature, when the temperature is higher than the set working temperature, the fan will increase the speed;

Set the water side control strategy, which adjusts the flow in real time through the temperature difference between the inlet and outlet water: install a water flow detector inside the air conditioner cabinet, and the water flow detector detects the water flow information in the pipeline in real time to control the flow rate set in the pipeline Electric two-way valve, the electric two-way valve adjusts the opening and closing degree of the control pipeline, and a water temperature sensor is installed at the water inlet and outlet position of the coil of the water-cooled air conditioner to detect the temperature difference between the water inlet and outlet water of the water-cooled air conditioner, so as to control the opening and closing degree of the electric two-way valve .

The detailed process of the wind side control strategy is:

1. First obtain the working temperature setting value A of the water-cooled air conditioner;

2. Obtain the supply air temperature value B actually detected by the temperature sensor;

3. When A=B, the fan speed remains unchanged, and return to step 1 after waiting for 3 seconds;

4. When A>B, if the temperature difference between A and B is less than 0.5°C, the fan speed will decrease by 20 rpm, and the PWM motor speed will decrease by 0.69%;

If the temperature difference between A and B is greater than or equal to 0.5°C and less than 1°C, the fan speed decreases by 50 rpm, and the PWM motor speed decreases by 1.73%;

If the temperature difference between A and B is greater than or equal to 1°C and less than 3°C, the fan speed decreases by 100 rpm, and the PWM motor speed decreases by 3.46%;

If the temperature difference between A and B is greater than or equal to 3°C, the fan speed decreases by 200 rpm, and the PWM motor speed decreases by 6.93%;

5. When A<B, if the temperature difference between B and A is less than 0.5°C, the fan speed increases by 20 rpm, and the PWM motor speed increases by 0.69%;

If the temperature difference between B and A is greater than or equal to 0.5°C and less than 1°C, the fan speed increases by 50 rpm, and the PWM motor speed increases by 1.73%;

If the temperature difference between B and A is greater than or equal to 1°C and less than 3°C, the fan speed increases by 100 rpm, and the PWM motor speed increases by 3.46%;

If the temperature difference between B and A is greater than or equal to 3°C, the fan speed increases by 200 rpm, and the PWM motor speed increases by 6.93%;

6. After the adjustment is completed, wait for 3 seconds and return to step 1.

In the water side control strategy, when the temperature difference between the inlet and outlet water of the coil is less than 4.8°C, the opening of the electric two-way valve increases; when it is detected that the temperature difference between the inlet and outlet water is greater than 5.2°C, the opening of the electric two-way valve decreases ; When it is detected that the temperature difference between the inlet and outlet water is between 4.8 and 5.2°C, the electric two-way valve will not act.

The beneficial effect that the present invention produces compared with prior art is:

The control method of a water-cooled air conditioner of the present invention is realized through two control principles of the wind side and the water side, wherein the wind side control is realized by adjusting the fan speed through the air supply temperature, and the water side control is realized through adjusting the water flow rate through the temperature difference between the inlet and outlet water. What is especially important is that this method emphasizes the synchronous regulation of the two when the power consumption of IT equipment changes, realizes rapid cooling of water-cooled air conditioners, improves the safety and availability of IT equipment, and at the same time realizes energy saving and consumption reduction, which greatly improves stability and reliability; practicality Strong, wide range of application, easy to promote.

Description of drawings

Accompanying drawing 1 is the realization schematic diagram of the present invention.

Accompanying drawing 2 is the flow chart of the wind side control strategy of the present invention.

Accompanying drawing 3 is the flow chart of the water side control strategy of the present invention.

detailed description

A control method for a water-cooled air conditioner of the present invention will be described in detail below in conjunction with the accompanying drawings.

The present invention provides a control method of water-cooled air conditioner. In the method, the water-cooled air conditioner implements temperature control and flow control on parameters such as air supply temperature and water flow rate. The communication control is correlated in real time according to the change of state. The reason is that when the cooling capacity of IT equipment changes, it will not only lead to a change in the temperature difference between the inlet and outlet water of the water-cooled air conditioner, but also be reflected in the air supply temperature of the water-cooled air conditioner. Based on this design idea, as shown in Figures 1 to 3, a control method for water-cooled air conditioners is now provided, and its specific implementation process is as follows:

Set the air side control strategy, which adjusts the fan speed in real time through the changing air supply temperature: the device arranges a temperature sensor at the air outlet of the water-cooled air conditioner or the air inlet of the IT cabinet to monitor the actual temperature of the air supply air of the air conditioner or the actual air intake of the IT equipment. To determine whether the temperature is equal to the set working temperature of the normal operation of the IT equipment.

In the control part, the air-conditioning air supply or the actual IT equipment inlet air temperature is used as an important indicator for controlling the fan speed. When the actual air supply temperature is higher than the set working temperature, the fan speed will increase appropriately. Of course, the increase of the fan speed needs to change in real time with the difference between the actual air supply temperature and the set working temperature. The control method can effectively realize the stepless variable speed of the fan, save energy, and avoid sudden changes in the noise of the fan, such as fluctuating high and low.

Set the water side control strategy, which adjusts the flow in real time through the temperature difference between the inlet and outlet water: the equipment installs a high-precision water flow detector in the air-conditioning cabinet to feed back the water flow information in the pipeline in real time, and also installs a water flow detector in the pipeline Electric two-way valve to actively adjust the opening and closing of the control pipeline. The purpose of adjusting the water flow is to control the heat exchange efficiency of the water flow in the coil, so a water temperature sensor is added at the inlet and outlet of the coil to detect the temperature difference between the inlet and outlet water, so as to control the opening and closing degree of the electric two-way valve.

The detailed process of the wind side control strategy is:

1. First obtain the working temperature setting value A of the water-cooled air conditioner;

2. Obtain the supply air temperature value B actually detected by the temperature sensor;

3. When A=B, the fan speed remains unchanged, and return to step 1 after waiting for 3 seconds;

4. When A>B, if the temperature difference between A and B is less than 0.5°C, the fan speed will decrease by 20 rpm, and the PWM motor speed will decrease by 0.69%;

If the temperature difference between A and B is greater than or equal to 0.5°C and less than 1°C, the fan speed decreases by 50 rpm, and the PWM motor speed decreases by 1.73%;

If the temperature difference between A and B is greater than or equal to 1°C and less than 3°C, the fan speed decreases by 100 rpm, and the PWM motor speed decreases by 3.46%;

If the temperature difference between A and B is greater than or equal to 3°C, the fan speed decreases by 200 rpm, and the PWM motor speed decreases by 6.93%;

5. When A<B, if the temperature difference between B and A is less than 0.5°C, the fan speed increases by 20 rpm, and the PWM motor speed increases by 0.69%;

If the temperature difference between B and A is greater than or equal to 0.5°C and less than 1°C, the fan speed increases by 50 rpm, and the PWM motor speed increases by 1.73%;

If the temperature difference between B and A is greater than or equal to 1°C and less than 3°C, the fan speed increases by 100 rpm, and the PWM motor speed increases by 3.46%;

If the temperature difference between B and A is greater than or equal to 3°C, the fan speed increases by 200 rpm, and the PWM motor speed increases by 6.93%;

6. After the adjustment is completed, wait for 3 seconds and return to step 1.

In the water side control strategy, when the temperature difference between the inlet and outlet water of the coil is less than 4.8°C, the opening of the electric two-way valve is increased by 2%; when the temperature difference between the inlet and outlet water is detected to be greater than 5.2°C, the opening of the electric two-way valve is Decrease by 2%; when it is detected that the temperature difference between the inlet and outlet water is between 4.8 and 5.2°C, the electric two-way valve will not act.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (1)

1. A control method for water-cooled air-conditioning, characterized in that its concrete implementation process is: Set the air side control strategy, which adjusts the fan speed in real time through the changing air supply temperature: install a temperature sensor at the air outlet of the water-cooled air conditioner to detect the temperature of the air supply air from the air conditioner, and determine whether the temperature is equal to the normal working temperature of the water-cooled air conditioner. Set the working temperature, when the temperature is higher than the set working temperature, the fan will increase the speed; The detailed process of the wind side control strategy is: 1. First obtain the working temperature setting value A of the water-cooled air conditioner; 2. Obtain the supply air temperature value B actually detected by the temperature sensor; 3. When A=B, the fan speed remains unchanged, and return to step 1 after waiting for 3 seconds; 4. When A>B, if the temperature difference between A and B is less than 0.5°C, the fan speed will decrease by 20 rpm, and the PWM motor speed will decrease by 0.69%; If the temperature difference between A and B is greater than or equal to 0.5°C and less than 1°C, the fan speed decreases by 50 rpm, and the PWM motor speed decreases by 1.73%; If the temperature difference between A and B is greater than or equal to 1°C and less than 3°C, the fan speed decreases by 100 rpm, and the PWM motor speed decreases by 3.46%; If the temperature difference between A and B is greater than or equal to 3°C, the fan speed decreases by 200 rpm, and the PWM motor speed decreases by 6.93%; 5. When A<B, if the temperature difference between B and A is less than 0.5°C, the fan speed increases by 20 rpm, and the PWM motor speed increases by 0.69%; If the temperature difference between B and A is greater than or equal to 0.5°C and less than 1°C, the fan speed increases by 50 rpm, and the PWM motor speed increases by 1.73%; If the temperature difference between B and A is greater than or equal to 1°C and less than 3°C, the fan speed increases by 100 rpm, and the PWM motor speed increases by 3.46%; If the temperature difference between B and A is greater than or equal to 3°C, the fan speed increases by 200 rpm, and the PWM motor speed increases by 6.93%; 6. After the adjustment is completed, wait for 3 seconds and return to step 1; Set the water side control strategy, which adjusts the flow in real time through the temperature difference between the inlet and outlet water: install a water flow detector inside the air conditioner cabinet, and the water flow detector detects the water flow information in the pipeline in real time to control the flow rate set in the pipeline Electric two-way valve, the electric two-way valve adjusts the opening and closing degree of the control pipeline, and a water temperature sensor is installed at the water inlet and outlet position of the coil of the water-cooled air conditioner to detect the temperature difference between the water inlet and outlet water of the water-cooled air conditioner, so as to control the opening and closing degree of the electric two-way valve In the water side control strategy, when the temperature difference between the inlet and outlet water of the coil is less than 4.8°C, the opening of the electric two-way valve increases; when the temperature difference between the inlet and outlet water is detected to be greater than 5.2°C, the opening of the electric two-way valve decreases. Small; when the temperature difference between the inlet and outlet water is detected to be between 4.8 and 5.2°C, the electric two-way valve will not act.