Air outlet control method of cooling unit and cooling unit

Abstract

The invention discloses an air outlet control method of a cooling unit and the cooling unit. The air outlet control method comprises the steps that whether the cooling unit operates normally or not is determined; when it is determined that the cooling unit is in the normal operation state, the rotating speed requirement of an indoor fan is obtained based on the temperature difference of indoor supplied air and returned air; when it is determined that the cooling unit is in the abnormal operation state, the rotating speed requirement of an indoor fan is obtained based on the indoor air supply temperature; and the rotating speed of the indoor fan is linearly adjusted based on the rotating speed requirement of the indoor fan. When the cooling unit is in normal operation, the rotating speed of the indoor fan can be controlled based on the temperature difference of indoor supplied air and returned air, and therefore it can be guaranteed that supplied air of the cooling unit meets the indoor airflow requirement; when the cooling unit operates abnormally, the rotating speed of the indoor fan can be controlled based on the indoor air supply temperature, so that the indoor fan operates at the lower limit rotating speed, hot air supplied to the indoor by the cooling unit is reduced, the indoor temperature is prevented from being too high, and normal work of other indoor electronic equipment is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to an air outlet control method for a cooling unit and a cooling unit. Background Art

[0002] With the rapid development of information technology, servers, storage devices, network devices, etc. in data centers are becoming more and more sophisticated and their functions are becoming more and more powerful. However, these devices will generate heat when working, which will increase the temperature of the devices. If the temperature of the devices is too high, it will affect the normal operation of the devices. Therefore, in order to ensure the normal operation of these devices, these devices need to be cooled down. Currently, direct expansion refrigeration systems or chilled water systems are usually used to cool down these devices.

[0003] In the process of realizing the invention, the inventors found that there are at least the following problems in the prior art:

[0004] The electronic components in the above equipment are very sensitive to temperature, and even slight temperature changes may affect their performance and stability. For example, high temperature may cause the chip's computing speed to decrease, the error rate to increase, and even damage the electronic components. When the direct expansion refrigeration system precision air conditioner commonly used in data centers switches to dual power supply due to a front-end power failure, the restart of the compressor in the direct expansion refrigeration system will cause the system to lose cold capacity for a short period of time, resulting in the air conditioner continuing to deliver hot air. Similarly, at the end of the chilled water system commonly used in data centers, in the scenario of a water valve failure, the water valve will lose control, causing the outlet air temperature of the chilled water end air conditioner to lose control. Summary of the invention

[0005] In order to effectively overcome the problems existing in the above-mentioned prior art, the main purpose of the present application is to provide an air outlet control method and a cooling unit for a cooling unit that can avoid excessively high indoor temperature due to supplying hot air into the room.

[0006] In order to achieve the above objectives, this application specifically adopts the following technical solutions:

[0007] The present application provides an air outlet control method for a cooling unit, wherein the cooling unit includes an indoor fan, and the indoor fan is used to circulate indoor air through the cooling unit to cool the room; the air outlet control method includes:

[0008] Determining whether the cooling unit is operating normally;

[0009] When it is determined that the cooling unit is in a normal operating state, obtaining a speed requirement of the indoor fan based on a temperature difference between indoor supply air and return air;

[0010] When it is determined that the cooling unit is in an abnormal operating state, obtaining a speed requirement of the indoor fan based on the indoor supply air temperature;

[0011] Linearly adjust the rotation speed of the indoor fan based on the rotation speed requirement of the indoor fan;

[0012] Among them, the greater the rotation speed requirement of the indoor fan, the faster the rotation speed of the indoor fan is controlled.

[0013] In some embodiments, obtaining the rotation speed requirement of the indoor fan based on the temperature difference between the indoor supply air and the return air is specifically:

[0014] Calculate the rotation speed requirement H of the indoor fan through the formula H = (W1 - W2) / W3 * 100%, where W1 is the temperature difference between the actual indoor supply air and the return air, W2 is the temperature difference between the target indoor supply air and the return air, and W3 is the sensitivity.

[0015] In some embodiments, obtaining the rotation speed requirement of the indoor fan based on the indoor supply air temperature is specifically:

[0016] Calculate the rotation speed requirement H of the indoor fan through the formula H = (T2 - T1) / T3 * 100%, where T1 is the actual indoor supply air temperature, T2 is the target indoor supply air temperature, and T3 is the sensitivity.

[0017] In some embodiments, determining whether the cooling unit is operating normally is specifically:

[0018] Detect whether the supply air temperature of the indoor fan is greater than the preset supply air temperature;

[0019] When the supply air temperature of the indoor fan is greater than the preset supply air temperature, determine that the cooling unit is in an abnormal operating state;

[0020] When the supply air temperature of the indoor fan is less than or equal to the preset supply air temperature, determine that the cooling unit is in a normal operating state.

[0021] In some embodiments, determining whether the cooling unit is operating normally is specifically:

[0022] Determine whether the cooling unit is operating normally based on the operating parameters of each component of the cooling unit.

[0023] In some embodiments, the linearly adjusting the rotation speed of the indoor fan based on the rotation speed requirement of the indoor fan includes:

[0024] When the rotation speed requirement H of the indoor fan is 0% < H < 100%, control the ratio V of the actual rotation speed of the indoor fan to the rated maximum rotation speed to be 20% < V < 100%;

[0025] When the speed demand H of the indoor fan is H≤0%, the ratio V of the actual speed of the indoor fan to the rated maximum speed is controlled to be 20%;

[0026] When the rotation speed demand H of the indoor fan is 100%≤H, the ratio V of the actual rotation speed of the indoor fan to the rated maximum rotation speed is controlled to be 100%.

[0027] Accordingly, the present application also provides a cooling unit, the cooling unit comprising:

[0028] A cooling component, the cooling component is used to provide a cooling medium;

[0029] An indoor fan, the indoor fan is used to circulate indoor air through the cooling assembly so that the indoor air can exchange heat with the cooling medium to cool the room;

[0030] A controller connected to the indoor fan, for determining whether the cooling unit is operating normally, and when it is determined that the cooling unit is in a normal operating state, obtaining a speed requirement of the indoor fan based on a temperature difference between indoor supply air and return air; when it is determined that the cooling unit is in an abnormal operating state, obtaining a speed requirement of the indoor fan based on an indoor supply air temperature;

[0031] The controller is also used to linearly adjust the speed of the indoor fan based on the speed requirement of the indoor fan; wherein, the greater the speed requirement of the indoor fan, the faster the speed of the indoor fan is controlled.

[0032] In some embodiments, when the speed requirement of the indoor fan is obtained based on the temperature difference between the indoor supply air and the return air, the controller is also used to calculate the speed requirement H of the indoor fan through the formula H = (W1-W2) / W3*100%, wherein W1 is the actual temperature difference between the indoor supply air and the return air, W2 is the target temperature difference between the indoor supply air and the return air, and W3 is the sensitivity.

[0033] In some embodiments, when the speed requirement of the indoor fan is obtained based on the indoor supply air temperature, the controller is also used to calculate the speed requirement H of the indoor fan through the formula H = (T2-T1) / T3*100%, wherein T1 is the actual indoor supply air temperature, T2 is the indoor target supply air temperature, and T3 is the sensitivity.

[0034] In some embodiments, the cooling unit is a direct expansion refrigeration unit or a chilled water refrigeration unit.

[0035] The air outlet control method of the present application determines the operating state of the cooling machine component. When the cooling unit is in a normal operating state, the speed requirement of the indoor fan is obtained based on the temperature difference between the indoor supply air and the return air. When the cooling unit is in an abnormal operating state, the speed requirement of the indoor fan is obtained based on the indoor supply air temperature, and then the speed of the indoor fan is linearly adjusted based on the speed requirement of the indoor fan. Compared with the prior art, when the cooling unit is in normal operation, the present application can control the speed of the indoor fan based on the temperature difference between the indoor supply air and the return air, so as to ensure that the air supply of the cooling unit meets the indoor air flow requirements, so that the indoor temperature is kept within the preset temperature range, thereby ensuring the normal operation of other indoor electronic equipment; when the cooling unit is in abnormal operation, the speed of the indoor fan can be controlled based on the indoor supply air temperature, so that the indoor fan runs at the lower limit speed, so as to reduce the cooling unit from sending hot air to the room, avoid excessive indoor temperature, and thus ensure the normal operation of other indoor electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A module block diagram of a cooling unit provided in an embodiment of the present application.

[0037] Figure 2 A flow chart of an air outlet control method for a cooling unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0041] In the related art, in order to ensure the temperature stability of some indoor environments (such as computer rooms), it is necessary to cool the indoor environments through some refrigeration systems (such as air conditioning). Currently, the commonly used refrigeration systems include direct expansion refrigeration systems and chilled water systems.

[0042] For the direct expansion cooling system, when there is a problem with the power supply and a dual power supply switch is required, the restart of the compressor may cause a short-term loss of cooling capacity in the direct expansion cooling system, resulting in the direct expansion cooling system continuously delivering hot air. This is because if the fan speed is fixed, the temperature difference between the server inlet and outlet air will remain unchanged when the server load remains unchanged. If the original inlet air temperature of the server is 25°C and the outlet air temperature is 38°C, then if the supply air temperature of the cooling unit rises to 30°C, the server outlet air temperature will reach 43°C, that is, the highest temperature of the environment where the server is located will reach 43°C, which may cause the server to experience performance degradation or even burn out. It should be noted that the temperature difference generally allowed in the data center is ±2°C, the target inlet air is 25°C, and hot air is delivered if it exceeds 27°C.

[0043] At present, in order to prevent the computer room from overheating, data centers generally require the compressor to start within 30 seconds after the power is switched on and run at full frequency within 120 seconds, so as to shorten the time of cold loss at the air-cooled end of the direct expansion cooling system as much as possible to reduce the risk of overheating in the computer room. However, this method of quickly starting the compressor will still cause a short period of cold loss, and there is a certain lag in the temperature drop after the direct expansion cooling system is running, so there is still a risk of overheating in the computer room caused by short-term hot air blowing.

[0044] For chilled water cooling systems, water valve failures currently generally result in an alarm output to prompt maintenance personnel to repair, but the end of the chilled water cooling system remains in operation. This method of maintaining the original opening after a water valve failure will cause the chilled water cooling system to deliver hot air to the computer room if the maintenance personnel do not repair it in time and the front-end water supply temperature rises, which also poses a risk of causing high temperatures in the computer room. This is because after a water valve failure, the unit's supply air temperature cannot be adjusted, and the supply air temperature may be too high, that is, the actual supply air temperature is higher than the target supply air temperature.

[0045] At present, the speed of the indoor fan of the computer room air conditioner is controlled based on the temperature difference between the supply air and the return air. Whether it is a direct expansion refrigeration system or a chilled water refrigeration system, when the power is switched or the water valve fails, the load of the computer room does not change, and the heat exchange capacity of the cooling unit will become smaller. At this time, the supply air temperature will rise, and the return air temperature will also rise, so that the temperature difference between the supply air and the return air will not change, then the speed of the indoor fan will basically not change, so that the cooling unit will continue to supply hot air. This application is based on the relationship between the indoor supply air, return air, air volume and the heat exchange capacity of the cooling unit. When the unit supply air temperature is high, the indoor fan is slowed down to reduce the air volume for heat exchange with the cooling unit. On the one hand, the unit outlet air temperature can be reduced by reducing the speed of the indoor fan, because when the surface temperature of the heat exchanger in the unit remains unchanged (that is, the heat exchange capacity is constant), the air volume passing through the heat exchanger is reduced, and the outlet temperature of the heat exchanger will become lower. On the other hand, the reduction in the speed of the indoor fan can reduce the amount of hot air sent to the computer room, preventing the risk of high temperature in the computer room.

[0046] Reference Figure 1 As shown, an embodiment of the present application discloses a cooling unit, which can be a direct expansion refrigeration unit or a chilled water refrigeration unit. The cooling unit generally includes a cooling component, an indoor fan and a controller, such as a machine room. The cooling component is used to provide a cooling medium, and at least part of the cooling component is installed indoors (such as a machine room). The indoor fan is installed indoors and cooperates with the part of the cooling component installed indoors, and can form a structure such as an air conditioner indoor unit. The controller is connected to the indoor fan and the cooling component respectively, and is used to control the operation of the indoor fan and the cooling component. When cooling the room, the controller can control the cooling component and the indoor fan to work separately, so as to provide a cooling medium with a lower temperature through the cooling component, and the indoor air can be circulated through the indoor unit of the air conditioner through the indoor fan, so that the indoor air can exchange heat with the cooling medium, thereby achieving indoor cooling. Among them, when the indoor fan is working, the air flowing into the indoor unit of the air conditioner can be called indoor return air, and the air flowing out of the indoor unit of the air conditioner can be called indoor supply air.

[0047] For example, a direct expansion refrigeration unit generally includes a compressor, a condenser, an evaporator, a throttling device, an indoor fan, a controller and other devices. The throttling device can be an electronic expansion valve. The compressor, condenser, evaporator and throttling device are connected by pipelines to form a cooling assembly. The compressor and condenser are generally installed outdoors to form an air conditioner outdoor unit. The evaporator, throttling device and indoor fan are generally installed indoors to form an air conditioner indoor unit. The controller is connected to the indoor fan, the compressor and the throttling device respectively to control the operation of the indoor fan, the compressor and the throttling device. During cooling, the condenser can make the gaseous refrigerant release heat and become liquid refrigerant, which then flows into the evaporator after being throttled by the throttling device. At the same time, the indoor fan is controlled to circulate the indoor air through the evaporator, so that the refrigerant in the evaporator exchanges heat with the indoor air. At this time, the air flowing into the air conditioner indoor unit from the indoor is cooled down after releasing heat, and then flows out from the air conditioner indoor unit to the indoor, thereby cooling the indoor room. The refrigerant in the evaporator absorbs heat and its temperature rises, turning into gaseous refrigerant. The gaseous refrigerant flows through the compressor, is compressed by the compressor, and then flows into the condenser.

[0048] The chilled water refrigeration unit usually includes components such as a water coil, a water pump, an indoor fan and a cooling water supply device. The cooling water supply device, the water pump and the water coil are connected by pipelines to form a cooling assembly, and the cooling water supply device and the water pump are usually installed outdoors, and the water coil and the indoor fan are usually installed indoors, which can form an air conditioner indoor unit. The controller is connected to the indoor fan and the water pump respectively, and is used to control the operation of the water pump and the indoor fan. During cooling, the water pump can be controlled to start, so that the cooling water supply device provides cooling water to the water coil. At the same time, the indoor fan is controlled to operate so that the indoor air circulates through the water coil, so that the cooling water in the water coil exchanges heat with the indoor air. At this time, the air flowing into the air conditioner indoor unit from the indoor unit releases heat and then flows out from the air conditioner indoor unit to the indoor unit, thereby achieving indoor cooling. The cooling water in the water coil absorbs heat and then flows back to the cooling water supply device to continue to be cooled.

[0049] During the process of cooling the indoor room, the controller is also used to determine whether the cooling unit is operating normally. When it is determined that the cooling unit is in a normal operating state, the speed requirement of the indoor fan is obtained based on the temperature difference between the indoor supply air and the return air. When it is determined that the cooling unit is in an abnormal operating state, the speed requirement of the indoor fan is obtained based on the indoor supply air temperature, and then the speed of the indoor fan is linearly adjusted based on the speed requirement of the indoor fan. The greater the speed requirement of the indoor fan, the faster the speed of the indoor fan is controlled.

[0050] Exemplarily, when the indoor fan speed demand H is 0% < H < 100%, the ratio V of the actual speed of the indoor fan to the rated maximum speed is controlled to be 20% < V < 100%. For example, when the indoor fan speed demand H is H = 50%, the ratio V of the actual speed of the indoor fan to the rated maximum speed is 60%. When the indoor fan speed demand H is H ≤ 0%, the ratio V of the actual speed of the indoor fan to the rated maximum speed is controlled to be 20%. When the indoor fan speed demand H is 100% ≤ H, the ratio V of the actual speed of the indoor fan to the rated maximum speed is controlled to be 100%.

[0051] In some embodiments, when the speed demand of the indoor fan is obtained based on the temperature difference between the indoor supply air and the return air, the speed demand H of the indoor fan can be calculated by the formula H = (W1 - W2) / W3 * 100%, where W1 is the temperature difference between the actual indoor supply air and the return air, W2 is the target temperature difference between the indoor supply air and the return air, W3 is the sensitivity. The target temperature difference between the indoor supply air and the return air can be set according to the actual use environment, and the sensitivity is the range allowing the temperature difference to float, which can also be set according to the actual use environment. Exemplarily, if the target temperature difference between the indoor supply air and the return air is 12K and the sensitivity is 3, and the actual temperature difference between the indoor supply air and the return air is 13K, then the indoor fan speed demand H is H = (13 - 12) / 3 * 100% = 33%.

[0052] In some other embodiments, when the speed demand of the indoor fan is obtained based on the indoor supply air temperature difference, the speed demand H of the indoor fan can be calculated by the formula H = (T2 - T1) / T3 * 100%, where T1 is the actual indoor supply air temperature, T2 is the target indoor supply air temperature, T3 is the sensitivity. The target indoor supply air temperature can be set according to the actual use environment, and the sensitivity is the range allowing the target supply air temperature to float, which can also be set according to the actual use environment. Exemplarily, if the target indoor supply air temperature is 25°C and the sensitivity is 3, and the actual indoor supply air temperature is 28°C, then the indoor fan speed demand H is H = (25 - 28) / 3 * 100% = -100%.

[0053] When the cooling unit is operating normally, the speed demand of the indoor fan can be obtained based on the temperature difference between the indoor supply air and the return air, and then the speed of the indoor fan can be linearly adjusted based on the obtained speed demand of the indoor fan, so that the temperature difference between the indoor supply air and the return air in the computer room can be controlled within the target range to ensure that the air supply of the cooling unit meets the air flow requirements of the computer room, keep the indoor temperature within the preset temperature range, and further ensure the normal operation of other electronic devices in the computer room.

[0054] When an abnormality occurs in the cooling unit, for a direct expansion refrigeration system, when a fault such as power failure occurs and the cooling unit restarts, the speed requirement of the indoor fan can be obtained based on the indoor supply air temperature, and then the speed of the indoor fan is linearly adjusted based on the obtained speed requirement of the indoor fan, that is, after the unit detects a power failure, the indoor fan switches to supply air temperature control, the higher the supply air temperature, the lower the indoor fan speed, and when the indoor supply air temperature reaches the supply air temperature warning value, the indoor fan runs at a standby speed. For a chilled water refrigeration unit, when a water valve fault occurs, the speed requirement of the indoor fan can also be obtained based on the indoor supply air temperature, and then the speed of the indoor fan is linearly adjusted based on the obtained speed requirement of the indoor fan, that is, after the unit detects a water valve fault, the indoor fan switches to supply air temperature control, the higher the supply air temperature, the lower the indoor fan speed, and when the indoor supply air temperature reaches the supply air temperature warning value, the indoor fan runs at a standby speed.

[0055] In some embodiments, the abnormality of the cooling unit can be determined by detecting the supply air temperature of the indoor fan. For example, when it is detected that the actual supply air temperature of the unit is greater than the preset supply air temperature, it can be determined that the cooling unit is in an abnormal state, and when it is detected that the actual supply air temperature of the unit is less than or equal to the preset supply air temperature, it can be determined that the cooling unit is in a normal operating state. When the cooling unit is abnormal and the indoor fan speed needs to be less than 0%, the indoor fan is controlled to operate at a lower limit speed to ensure that the cooling unit does not supply hot air to the machine room.

[0056] In other embodiments, the abnormality of the cooling unit can also be determined by detecting the operating parameters of the various components of the cooling unit. For example, it is possible to determine whether the cooling unit is in an abnormal operating state by detecting the operating power, voltage, current of the compressor or the relevant parameters of the electronic expansion valve, or by comparing the difference between the software-delivered opening of the water valve and the feedback actual opening with the absolute value, and judging whether the cooling unit is abnormal based on the comparison result. For example, when it is detected that |Q1-Q2|≥Q3, it is judged that the water valve is faulty, that is, the cooling unit is operating abnormally, where Q1 is the water valve opening delivered by the software, Q2 is the actual opening of the water valve feedback, and Q3 is the set value.

[0057] During the process of the indoor fan running at the lower limit speed, if the controller detects that the cooling unit has resumed normal operation, it is determined that the cooling capacity of the cooling unit has returned to normal. At this time, the speed requirement of the indoor fan can be obtained based on the temperature difference between the indoor supply air and the return air, and then the speed of the indoor fan is linearly adjusted based on the obtained speed requirement of the indoor fan to restore the normal operation mode. Among them, whether the cooling unit has resumed normal operation can be determined by judging whether the opening time of the compressor has reached the preset time, or by judging whether the opening time of the electronic expansion valve has reached the preset time.

[0058] In actual application scenarios, when the controller detects that the compressor is shut down or the electronic expansion valve is closed or the water valve is faulty, the indoor fan is controlled to run at a standby speed instead of adjusting the indoor fan speed based on the temperature difference between the supply air and the return air; when the controller detects that the compressor is restarted or the electronic expansion valve is opened, the speed of the indoor fan is controlled by the supply air temperature and gradually increases; when the indoor fan speed rises to the speed before the compressor is shut down or the electronic expansion valve is closed, or after the compressor or the electronic expansion valve is turned on for a preset time, the speed of the indoor fan resumes being controlled by the temperature difference between the supply air and the return air, or, when the water valve fault alarm is eliminated and the cooling capacity of the cooling unit returns to normal, the indoor fan control mode automatically switches to indoor supply air temperature control and resumes normal operating mode.

[0059] Reference Figure 2 As shown, based on the above embodiment, the embodiment of the present application further discloses an air outlet control method for a cooling unit, and the air outlet control method can be applied to the cooling unit described in the above embodiment, and the air outlet control method includes the steps of:

[0060] S11. Determine whether the cooling unit is operating normally.

[0061] Specifically, it is detected whether the air supply temperature of the indoor fan is greater than the preset temperature. When the air supply temperature of the indoor fan is greater than the preset temperature, it is determined that the cooling unit is in an abnormal state. When the air supply temperature of the indoor fan is less than or equal to the preset temperature, it is determined that the cooling unit is in a normal operating state. The preset temperature can be set according to actual environmental requirements, for example, it can be set to 15°C, 20°C, 25°C, etc.

[0062] In other embodiments, the abnormality of the cooling unit can also be determined by detecting the operating parameters of the various components of the cooling unit. For example, it is possible to determine whether the cooling unit is in an abnormal operating state by detecting the operating power, voltage, current of the compressor or the relevant parameters of the electronic expansion valve, or by comparing the difference between the software-delivered opening of the water valve and the feedback actual opening with the absolute value, and judging whether the cooling unit is abnormal based on the comparison result. For example, when it is detected that |Q1-Q2|≥Q3, it is judged that the water valve is faulty, that is, the cooling unit is operating abnormally, where Q1 is the water valve opening delivered by the software, Q2 is the actual opening of the water valve feedback, and Q3 is the set value.

[0063] S12. When it is determined that the cooling unit is in a normal operating state, the speed requirement of the indoor fan is obtained based on the temperature difference between the indoor supply air and the return air; when it is determined that the cooling unit is in an abnormal operating state, the speed requirement of the indoor fan is obtained based on the indoor supply air temperature.

[0064] Specifically, when the rotational speed requirement of the indoor fan is obtained based on the temperature difference between the indoor supply air and the return air, the rotational speed requirement of the indoor fan can be calculated by the formula H = (W1 - W2) / W3 * 100%, where W1 is the temperature difference between the actual indoor supply air and the return air, W2 is the target temperature difference between the indoor supply air and the return air, and W3 is the sensitivity.

[0065] When the rotational speed requirement of the indoor fan is obtained based on the indoor supply air temperature, the rotational speed requirement of the indoor fan can be calculated by the formula H = (T2 - T1) / T3 * 100%, where T1 is the actual indoor supply air temperature, T2 is the target indoor supply air temperature, and T3 is the sensitivity.

[0066] S13. Linearly adjust the rotational speed of the indoor fan based on the rotational speed requirement of the indoor fan.

[0067] Specifically, the greater the rotational speed requirement of the indoor fan, the faster the rotational speed of the indoor fan is controlled.

[0068] In practical applications, when the cooling unit is operating normally, obtain the rotational speed requirement of the indoor fan based on the temperature difference between the indoor supply air and the return air, and then linearly adjust the rotational speed of the indoor fan based on the obtained rotational speed requirement of the indoor fan. When the cooling unit is abnormal, obtain the rotational speed requirement of the indoor fan based on the indoor supply air temperature; then linearly adjust the rotational speed of the indoor fan based on the obtained rotational speed requirement of the indoor fan.

[0069] Exemplarily, when the rotational speed requirement H of the indoor fan is 0% < H < 100%, control the ratio V of the actual rotational speed of the indoor fan to the rated maximum rotational speed to be 20% < V < 100%; when the rotational speed requirement H of the indoor fan is H ≤ 0%, control the ratio V of the actual rotational speed of the indoor fan to the rated maximum rotational speed to be 20%; when the rotational speed requirement H of the indoor fan is 100% ≤ H, control the ratio V of the actual rotational speed of the indoor fan to the rated maximum rotational speed to be 100%.

[0070] In this application, when the cooling unit is operating normally, the rotational speed of the indoor fan can be controlled based on the temperature difference between the indoor supply air and the return air, so as to ensure that the air supply of the cooling unit meets the indoor air flow requirements, keep the indoor temperature within the preset temperature range, and further ensure the normal operation of other indoor electronic devices; when the cooling unit is operating abnormally, the rotational speed of the indoor fan can be controlled based on the indoor supply air temperature, so that the indoor fan operates at the lower limit rotational speed to reduce the hot air sent by the cooling unit into the room and avoid the indoor temperature from being too high, thereby ensuring the normal operation of other indoor electronic devices.

[0071] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for controlling air flow of a cooling unit, wherein the cooling unit comprises an indoor fan, and the indoor fan is used to circulate indoor air through the cooling unit to cool the room; characterized in that: The air outlet control method includes: Determine whether the cooling unit is operating normally; When it is determined that the cooling unit is in a normal operating state, obtain the rotational speed requirement of the indoor fan based on the temperature difference between the indoor supply air and return air; When it is determined that the cooling unit is in an abnormal operating state, obtain the rotational speed requirement of the indoor fan based on the indoor supply air temperature; Linearly adjust the rotational speed of the indoor fan based on the rotational speed requirement of the indoor fan; Wherein, the greater the rotational speed requirement of the indoor fan, the faster the rotational speed of the indoor fan is controlled.

2. The air outlet control method according to claim 1, characterized in that: The obtaining of the rotational speed requirement of the indoor fan based on the temperature difference between the indoor supply air and return air is specifically: Calculate the rotational speed requirement H of the indoor fan through the formula H=(W1 - W2) / W3*100%, where W1 is the temperature difference between the actual indoor supply air and return air, W2 is the target temperature difference between the indoor supply air and return air, and W3 is the sensitivity.

3. The air outlet control method according to claim 1, characterized in that: The obtaining of the rotational speed requirement of the indoor fan based on the indoor supply air temperature is specifically: Calculate the rotational speed requirement H of the indoor fan through the formula H=(T2 - T1) / T3*100%, where T1 is the actual indoor supply air temperature, T2 is the target indoor supply air temperature, and T3 is the sensitivity.

4. The air outlet control method according to claim 1, characterized in that: The determination of whether the cooling unit is operating normally is specifically: Detect whether the supply air temperature of the indoor fan is greater than the preset supply air temperature; When the supply air temperature of the indoor fan is greater than the preset supply air temperature, determine that the cooling unit is in an abnormal operating state; When the supply air temperature of the indoor fan is less than or equal to the preset supply air temperature, determine that the cooling unit is in a normal operating state.

5. The air outlet control method according to claim 1, characterized in that: The determination of whether the cooling unit is operating normally is specifically: Determine whether the cooling unit is operating normally based on the operating parameters of each component of the cooling unit.

6. The air outlet control method according to any one of claims 1 to 5, characterized in that: The linearly adjusting the rotational speed of the indoor fan based on the rotational speed requirement of the indoor fan includes: When the rotational speed requirement H of the indoor fan is 0% < H < 100%, control the ratio V of the actual rotational speed of the indoor fan to the rated maximum rotational speed to be 20% < V < 100%; When the rotational speed requirement H of the indoor fan is H ≤ 0%, control the ratio V of the actual rotational speed of the indoor fan to the rated maximum rotational speed to be 20%; When the rotational speed requirement H of the indoor fan is 100% ≤ H, control the ratio V of the actual rotational speed of the indoor fan to the rated maximum rotational speed to be 100%.

7. A cooling unit, characterized in that: Includes: A cooling component for providing a cooling medium; An indoor fan for circulating indoor air through the cooling component so that the indoor air can exchange heat with the cooling medium to cool the indoor environment; A controller connected to the indoor fan for determining whether the cooling unit is operating normally, and when it is determined that the cooling unit is in a normal operating state, obtaining the rotational speed requirement of the indoor fan based on the temperature difference between the indoor supply air and return air; when it is determined that the cooling unit is in an abnormal operating state, obtaining the rotational speed requirement of the indoor fan based on the indoor supply air temperature; The controller is also used to linearly adjust the speed of the indoor fan based on the speed requirement of the indoor fan; wherein, the greater the speed requirement of the indoor fan, the faster the speed of the indoor fan is controlled.

8. The cooling unit according to claim 7, characterized in that: When the speed requirement of the indoor fan is obtained based on the temperature difference between the indoor supply air and the return air, the controller is also used to calculate the speed requirement H of the indoor fan by the formula H=(W1-W2) / W3*100%, wherein W1 is the actual temperature difference between the indoor supply air and the return air, W2 is the target temperature difference between the indoor supply air and the return air, and W3 is the sensitivity.

9. The cooling unit according to claim 7, characterized in that: When the speed requirement of the indoor fan is obtained based on the indoor supply air temperature, the controller is also used to calculate the speed requirement H of the indoor fan by the formula H=(T2-T1) / T3*100%, wherein T1 is the actual indoor supply air temperature, T2 is the target indoor supply air temperature, and T3 is the sensitivity.

10. The cooling unit according to claim 7, characterized in that: The cooling unit is a direct expansion refrigeration unit or a chilled water refrigeration unit.

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