Anti-condensation control method, cooling device and refrigeration unit

Abstract

The application discloses a condensation prevention control method, a cooling device and a refrigerating unit. The cooling device is used for cooling a heat generating component. The condensation prevention control method comprises the following steps: detecting the ambient temperature and the ambient humidity where the heat generating component is located and calculating a dew point temperature T0; judging whether the ambient humidity exceeds a set humidity limit value; if yes, performing an ambient temperature rising action, and starting the cooling device when the actual temperature of the heat generating component is greater than the dew point temperature T0; and if no, starting the cooling device when the actual temperature of the heat generating component exceeds a set limit temperature. The application combines the ambient temperature and humidity where the heat generating component is located with the actual temperature of the heat generating component, reasonably determines the starting time of the cooling device, and designs the condensation prevention and heat dissipation control action only for the cooling device, so that the condensation phenomenon of the heat generating component is effectively prevented, and the reliability of the refrigerating unit is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to anti-condensation control methods, cooling devices, and refrigeration units. Background Technology

[0002] Compressors, rectifier modules, and other components are key parts of refrigeration units. They continuously generate heat during unit operation, and the heat dissipation design of these key components directly affects the reliability of the unit. The common heat dissipation method is to use a cooling medium. Cooling systems typically introduce a low-temperature cooling medium into the pipeline. The low-temperature cooling medium uses the pipeline to contact the heat-generating components for heat exchange to remove heat. This method has good heat dissipation effect and a wide range of applications. However, due to the low temperature of the cooling medium, condensation is very likely to occur on the over-cooled heat-generating components when the ambient humidity is high, which can lead to unit failure.

[0003] Existing technologies have developed anti-condensation control methods suitable for cooling medium heat dissipation. These methods calculate and determine the corresponding air dew point temperature based on ambient temperature and humidity, obtain the copper pipe temperatures at both ends of the heat dissipation pipe, calculate and compare the lowest values ​​of the two copper pipe temperatures, and adjust the start / stop of the air conditioning system and the opening degree of the throttling component based on the difference between the lowest value and the air dew point temperature, combined with the operating mode of the air conditioning system. This control scheme has a complex design logic, and the operating status of the air conditioning system must be frequently adjusted in conjunction with the copper pipe temperature of the heat dissipation pipe and the air dew point temperature. It may even require the system to be shut down for a rated time before restarting. The system has poor stability and low fault tolerance.

[0004] Therefore, how to design a more stable and reliable anti-condensation control method is a technical problem that the industry has been working to solve. Summary of the Invention

[0005] To address the shortcomings of existing control schemes that frequently adjust the operating status of air conditioning systems, leading to instability, this invention proposes an anti-condensation control method, a cooling device, and a refrigeration unit. By combining the ambient temperature and humidity of the heating components with the actual temperature of the heating components, the timing of the cooling device's activation is rationally determined. The anti-condensation and heat dissipation control actions are designed only for the cooling device, effectively preventing condensation on the heating components and greatly improving the reliability of the refrigeration unit.

[0006] The technical solution adopted in this invention is to design an anti-condensation control method for a cooling device. The cooling device is used to cool the heating components, and the anti-condensation control method includes:

[0007] Detect the ambient temperature and humidity of the heating element and calculate the dew point temperature T0;

[0008] Determine if the ambient humidity exceeds the set humidity limit;

[0009] If so, then the ambient temperature rise action will be executed, and the cooling device will be turned on when the actual temperature of the heating component is greater than the dew point temperature T0.

[0010] If not, the cooling device will be activated when the actual temperature of the heating component exceeds the set limit temperature.

[0011] Preferably, after turning on the cooling device, different set control temperatures are selected as the target temperature of the cooling device based on the ambient humidity and the actual temperature of the heating component, and the flow rate of the cooling medium in the cooling device is adjusted to maintain the actual temperature of the heating component at the target temperature.

[0012] Preferably, when the ambient humidity S ≤ the set humidity limit A%, the set control temperature that is lower than the actual temperature of the heating element and closest to the actual temperature is selected as the target temperature; when the ambient humidity S > the set humidity limit A%, the highest set control temperature is selected as the target temperature.

[0013] Furthermore, setting the limit temperature includes setting the maximum temperature and setting the minimum temperature, setting the control temperature includes setting the upper limit temperature and setting the lower limit temperature, setting the minimum temperature < setting the upper limit temperature < setting the maximum temperature, and setting the dew point temperature T0 < setting the lower limit temperature ≤ setting the minimum temperature.

[0014] When the ambient humidity exceeds the set humidity limit and the actual temperature of the heating element is greater than the dew point temperature T0, the target temperature is the set upper limit temperature.

[0015] And / or when the ambient humidity does not exceed the set humidity limit and the actual temperature of the heating element is greater than the set maximum temperature, the target temperature is the set upper limit temperature;

[0016] And / or when the ambient humidity does not exceed the set humidity limit, and the set minimum temperature < the actual temperature of the heating element ≤ the set maximum temperature, the target temperature is the set lower limit temperature.

[0017] Preferably, the anti-condensation control method further includes: if the ambient humidity does not exceed the set humidity limit, the cooling device is turned off when the dew point temperature T0 < the actual temperature of the heating element ≤ the set limit temperature.

[0018] Preferably, the anti-condensation control method further includes: if the ambient humidity does not exceed the set humidity limit, then when the actual temperature of the heating element is ≤ the dew point temperature T0, an ambient temperature increase action is performed.

[0019] Furthermore, the heating element includes at least one heating component, and the actual temperature of the heating element is the highest among all heating components.

[0020] Furthermore, the cooling device is equipped with valves for regulating the flow rate of the cooling medium, the valve opening degree U k =V k+W k Among them, V k W is the preset basic opening value. k To correct the opening value, and W k The temperature is dynamically adjusted based on the overheating ΔT of the heating element.

[0021] Furthermore, the valve opening adjustment includes:

[0022] Select the maximum value △Tmax among all the temperature superheat △T of the heating components. Temperature superheat △T is the actual temperature of the heating component minus the ambient temperature of the equipment where the heating component is located before it is turned on.

[0023] Calculate e(k) = ΔT max -△T 目标 , △T 目标 Subtract the ambient temperature of the device containing the heating element before it is powered on from the target temperature;

[0024] When e(k) ≤ 0, W k constant;

[0025] When e(k) > 0, W k = W k-1 +△W k , △W k =K p,h ×[△T max (k)-△T max (k-1) ]+K i,h ×e(k), K p,h K is the proportionality coefficient. i,h is the integral coefficient.

[0026] Preferably, the dew point temperature is updated each time the ambient temperature and humidity of the heating element are detected, and the working status of the cooling device is controlled and / or the target temperature of the cooling device is adjusted according to the updated dew point temperature.

[0027] Preferably, when performing the action of increasing the ambient temperature, the cooling device is turned off or controlled by a micro-flow rate.

[0028] In some embodiments, the action of raising the ambient temperature is to turn on the compressor to preheat or to turn on the heating device to supply heat to the environment where the heat-generating component is located.

[0029] The present invention also proposes a cooling device employing the above-mentioned anti-condensation control method, comprising: a cooling pipe for circulating a cooling medium, and a valve installed on the cooling pipe, wherein the cooling pipe is in contact with a heating component, and the valve regulates the flow rate of the cooling medium in the cooling pipe.

[0030] Preferably, the heating element includes at least one heating component, which is sequentially distributed in series on the inlet side of the cooling pipe along the flow direction of the cooling medium, and the valve is located on the outlet side of the cooling pipe.

[0031] The present invention also proposes a refrigeration unit having the above-described cooling device.

[0032] Preferably, the cooling pipes of the cooling device use the cooling medium inside the refrigeration unit, and both the inlet and outlet sides of the cooling pipes are connected to the cooling medium circulation loop of the refrigeration unit.

[0033] In some embodiments, the refrigeration unit is a centrifugal chiller unit, which employs an air-suspension compressor, and the heating component includes at least one of an air-suspension compressor, an inverter module, and a rectifier module.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] 1. Combine the ambient temperature and humidity of the heating element with the actual temperature of the heating element to reasonably determine the timing of turning on the cooling device, thereby reducing the risk of condensation on the heating element;

[0036] 2. Select different set control temperatures as the target temperature of the cooling device according to the ambient humidity and the actual temperature of the heating component. Control the actual temperature of the heating component at an appropriate target temperature to avoid the heating component from getting too cold and achieve the "heat preservation" and anti-condensation effect of the cooling device.

[0037] 3. Adjust the valve opening of the cooling device to stabilize the temperature of the heat-generating components. All control actions for anti-condensation and heat dissipation are designed only for the cooling device, thereby improving the reliability of the refrigeration unit.

[0038] 4. The valve opening degree is calculated based on the temperature and superheat of the heating element, making the adjustment more efficient and precise. Attached Figure Description

[0039] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0040] Figure 1 This is a flowchart illustrating the anti-condensation control method of the present invention;

[0041] Figure 2 This is a schematic diagram of segmented control under normal environmental humidity conditions according to the present invention;

[0042] Figure 3 This is a flowchart illustrating a feasible embodiment of the present invention;

[0043] Figure 4 This is a connection diagram of the cooling device of the present invention;

[0044] Figure 5This is a schematic diagram of the refrigerant flow direction of the cooling device of the present invention;

[0045] Explanation of reference numerals in the attached diagram: 1. Valve; 2. Cooling pipe; 3. Rectifier module; 4. Inverter module; 5. Compressor; 100. Refrigeration unit. Detailed Implementation

[0046] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] The anti-condensation control method proposed in this invention is designed based on the low-temperature heat dissipation method of the cooling device. The cooling device uses a low-temperature cooling medium such as refrigerant or water to cool the heating component. Generally, the cooling device usually includes cooling pipes and valves installed on the cooling pipes. The cooling pipes exchange heat with the heating component in contact. A low-temperature cooling medium is introduced into the cooling pipes to remove the heat from the heating component. The valves are used to regulate the flow rate of the cooling medium in the cooling pipes to control the actual temperature of the heating component. When the valves are closed, the cooling medium cannot flow through the cooling pipes, and the cooling device is shut down. When the valves are open, the cooling medium flows through the cooling pipes, and the cooling device is turned on.

[0048] like Figure 1 As shown, the anti-condensation control method includes the following steps:

[0049] Detect the ambient temperature T and ambient humidity S of the heating element, and calculate the dew point temperature T0 based on the ambient temperature T and ambient humidity S;

[0050] Determine if the ambient humidity S exceeds the set humidity limit A%.

[0051] If so, it means that the humidity of the environment where the heating element is located is too high. Therefore, the ambient temperature is increased to reduce the humidity of the environment where the heating element is located, thereby reducing the risk of condensation. After the ambient temperature is increased, it is determined whether the actual temperature Tr of the heating element is greater than the dew point temperature T0. If so, it means that the temperature of the heating element is too high, the risk of condensation is low, and the heating element has heat dissipation requirements. Therefore, the cooling device is turned on to cool down the heating element.

[0052] If not, it means that the ambient temperature and humidity of the current heating component are normal. Next, it is determined whether the actual temperature Tr of the heating component exceeds the set limit temperature. If so, it means that the temperature of the heating component is high, so the cooling device is turned on to cool down the heating component.

[0053] This invention combines the ambient temperature and humidity of the heating element with the actual temperature of the heating element to rationally determine the timing of the cooling device's activation, thereby reducing the risk of condensation on the heating element and achieving effective heat dissipation.

[0054] To improve the anti-condensation effect, after turning on the cooling device, different set control temperatures are selected as the target temperature of the cooling device based on the ambient humidity S and the actual temperature Tr of the heating element. The flow rate of the cooling medium in the cooling device is adjusted to maintain the actual temperature Tr of the heating element at the target temperature.

[0055] It should be noted that when the ambient humidity is normal—ambient humidity S ≤ set humidity limit A%—the target temperature should be a set control temperature that is lower than but closest to the actual temperature of the heating element. The cooling device should be able to quickly cool the heating element to this set control temperature, keeping it in a "heat-preserving" state and preventing condensation. When the ambient humidity is high—ambient humidity S > set humidity limit A%—the risk of condensation is higher. A higher set control temperature should be selected in this case. The heating element maintains a higher actual temperature, and the cooling capacity supplied by the cooling device can be reduced, thus mitigating the risk of condensation from multiple perspectives. More precisely, among all set control temperatures, the set control temperature corresponding to high ambient humidity should be at least higher than the set control temperature corresponding to normal ambient humidity.

[0056] This invention selects the corresponding target temperature based on the environmental and heating states of the heating element, effectively preventing condensation and meeting the heat dissipation requirements of the heating element. More importantly, since the cooling pipes of the cooling device typically use the cooling medium from the refrigeration unit—that is, a portion of the cooling medium from the refrigeration unit is sent to the cooling device to cool the heating element—the more frequent the valve changes and the larger the opening adjustment range, the greater the impact on the normal operation of the refrigeration unit. Reasonably selecting the target temperature can reduce the impact of heat dissipation and cooling on the refrigeration unit and improve its stability.

[0057] like Figure 2 As shown, in some embodiments of the present invention, setting the limit temperature includes setting a maximum temperature Tset1 and setting a minimum temperature Tset2, setting the control temperature includes setting an upper limit temperature TX1 and setting a lower limit temperature TX2, setting a minimum temperature Tset2 < setting an upper limit temperature TX1 < setting a maximum temperature Tset1, and setting a dew point temperature T0 < setting a lower limit temperature TX2 ≤ setting a minimum temperature Tset2.

[0058] When the ambient humidity exceeds the set humidity limit and the actual temperature Tr of the heating element is greater than the dew point temperature T0, it indicates that the ambient humidity is too high, the risk of condensation is high, and the heating element has a heat dissipation requirement. Therefore, the target temperature is set to the set upper limit temperature TX1.

[0059] And / or when the ambient humidity S does not exceed the set humidity limit A%, and the actual temperature Tr of the heating element is greater than the set maximum temperature Tset1, it indicates that the ambient humidity is normal and the temperature of the heating element is high. Therefore, the target temperature is set to the set upper limit temperature TX1, which is close to the actual temperature.

[0060] And / or when the ambient humidity S does not exceed the set humidity limit A%, and the set minimum temperature Tset2 < the actual temperature Tr of the heating element ≤ the set maximum temperature Tset1, it indicates that the ambient humidity is normal and the temperature of the heating element is too high. Therefore, the target temperature is set to the set lower limit temperature TX2, which is close to the actual temperature.

[0061] It should be understood that the setting of the limit temperature and the setting of the control temperature can be flexibly designed according to specific needs in different application scenarios. In some embodiments, the upper limit temperature in the setting of the control temperature is calculated from the dew point temperature T0. For example, the upper limit temperature TX1 = T0 + C, where C is the margin temperature. The upper limit temperature TX1 is dynamically adjusted according to the dew point temperature T0 detected and calculated in real time to ensure the anti-condensation effect.

[0062] Based on the set limit temperature including the set maximum temperature Tset1 and the set minimum temperature Tset2, in some embodiments of the present invention, the anti-condensation control method further includes: if the ambient humidity S does not exceed the set humidity limit A%, it indicates that the humidity of the ambient temperature where the heating element is located is normal; then it is determined whether the dew point temperature T0 < the actual temperature Tr of the heating element ≤ the set minimum temperature Tset2; if so, it indicates that the temperature of the heating element is normal and the risk of condensation is low. Therefore, the cooling device is turned off or controlled by microflow, and the heat generated by the heating element continues to work is naturally cooled and consumed. The heating element is actually in a "heat preservation" state to avoid condensation.

[0063] In some other embodiments of the present invention, the anti-condensation control method further includes: if the ambient humidity S does not exceed the set humidity limit A%, it indicates that the humidity of the ambient temperature where the heating element is located is normal; then it is determined whether the actual temperature Tr of the heating element is less than or equal to the dew point temperature T0; if so, it indicates that the temperature of the heating element is too low and there is a risk of condensation; then an ambient temperature increase action is performed to increase the ambient temperature where the heating element is located, dry the moisture in the air, and heat the heating element while reducing the ambient humidity to avoid condensation.

[0064] In a preferred embodiment of the invention, to further reduce the risk of condensation, whenever the ambient temperature is raised, the cooling device is either shut off or controlled by a micro-flow rate. This means the supply of cooling to the heating element is temporarily stopped or reduced to a very small amount. The heat generated by the heating element during operation is naturally dissipated, keeping it in a "heat-preserving" state. It should be understood that a micro-flow rate controlled cooling device refers to controlling the flow rate of the cooling medium to a set minimum. For cooling devices equipped with valves, this can be achieved by reducing the valve opening to the set minimum opening.

[0065] To ensure effective heat dissipation, the heating component includes at least one heating element, each equipped with a temperature sensor to detect its actual temperature. An ambient temperature sensor and a humidity sensor are installed in the environment where the heating component is located. The actual temperature Tr of the heating component is the highest temperature among all heating elements. Taking some embodiments of the present invention as examples, the heating component includes a rectifier module, an inverter module, and a compressor. The actual temperature of the rectifier module is T1, the actual temperature of the inverter module is T2, and the actual temperature of the compressor is T3. Therefore, the actual temperature Tr of the heating component is Tmax{T1, T2, T3}.

[0066] The cooling system is equipped with valves to control the flow rate of the cooling medium. Valves such as electronic expansion valves, whose opening degree can be automatically adjusted in a controlled manner, are selected. The valve opening degree U... k =V k +W k Among them, V k W is the preset basic opening value. k To correct the opening value, and W k The temperature is dynamically adjusted based on the overheating ΔT of the heating element, so that the actual temperature of each heating element is at or below the target temperature.

[0067] In some embodiments of the present invention, the valve opening adjustment includes:

[0068] Select the maximum value △Tmax among all the temperature superheat △T of the heating components. Temperature superheat △T is the actual temperature of the heating component minus the ambient temperature of the equipment where the heating component is located before it is turned on.

[0069] Calculate e(k) = ΔT max -△T 目标 , △T 目标 Subtract the ambient temperature of the device containing the heating element before it is powered on from the target temperature;

[0070] When e(k) ≤ 0, W k constant;

[0071] When e(k) > 0, Wk = W k-1 +△W k , △W k =K p,h ×[△T max (k)-△T max (k-1) ]+K i,h ×e(k), K p,h K is the proportionality coefficient. i,h is the integral coefficient.

[0072] Among them, △W k,p = K p,h ×[△T max (k)-△T max (k-1) ],△W k,i = K i,h ×e(k), △W k,p It is a proportional correction value, △W k,i It is the integral correction value.

[0073] It should be noted that W k The value is calculated periodically, and the time interval can be designed according to actual needs, such as calculating every 100 seconds. Different target temperatures have corresponding upper and lower limits for the valve opening, and the valve opening cannot exceed the upper and lower limits for the corresponding target temperature.

[0074] In addition, the dew point temperature T0 mentioned above is calculated from the real-time detected ambient temperature T and ambient humidity S. The dew point temperature T0 is updated every time a new ambient temperature and humidity are obtained. The steps in the anti-condensation control method that use the dew point temperature T0 are all based on the updated dew point temperature T0, that is, the working status of the cooling device and / or the target temperature of the cooling device are controlled according to the updated dew point temperature T0.

[0075] In some embodiments of the present invention, the device containing the heating component is a refrigeration unit, and the heating component includes at least one of the compressor, inverter module and rectifier module of the refrigeration unit.

[0076] It should be noted that the ambient temperature increase action mentioned above can be preheating by turning on the compressor, or it can be installing a heating device in the environment where the heating component is located and turning on the heating device to supply heat to the environment where the heating component is located. The heating device can be an electric heating wire, etc. The present invention does not impose any special restrictions on the specific implementation method of the ambient temperature increase action.

[0077] like Figure 3As shown, the process of the anti-condensation control method is described in detail using an application example of the present invention. Setting the limit temperature includes setting the maximum temperature Tset1 and setting the minimum temperature Tset2, and setting the control temperature includes setting the upper limit temperature TX1 and setting the lower limit temperature TX2.

[0078] Step S1: Detect the ambient temperature T and ambient humidity S of the heating element, and calculate the dew point temperature T0 based on the ambient temperature T and ambient humidity S.

[0079] Step S2: Determine whether the ambient humidity S exceeds the set humidity limit A%. If yes, proceed to step S3; otherwise, proceed to step S6.

[0080] Step S3: Execute the ambient temperature increase action, turn off the cooling device, and proceed to step S4;

[0081] Step S4: Determine whether the actual temperature Tr of the heating element is greater than the dew point temperature T0. If yes, proceed to step S5; otherwise, return to step S1.

[0082] Step S5: Turn on the cooling device and adjust the valve opening to maintain the actual temperature Tr of the heating component at the set upper limit temperature TX1.

[0083] Step S6: Determine whether the actual temperature Tr of the heating component is greater than the set maximum temperature Tset1. If yes, proceed to step S5; otherwise, proceed to step S7.

[0084] Step S7: Determine whether the actual temperature Tr of the heating component is greater than the set minimum temperature Tset2. If yes, proceed to step S8; otherwise, proceed to step S9.

[0085] Step S8: Turn on the cooling device and adjust the valve opening to maintain the actual temperature Tr of the heating component at the set lower limit temperature TX2.

[0086] Step S9: Determine whether the actual temperature of the heating component is greater than the dew point temperature T0. If yes, proceed to step S10; otherwise, proceed to step S11.

[0087] Step S10: Turn off the cooling device;

[0088] Step S11: Execute the ambient temperature increase action and turn off the cooling device.

[0089] like Figure 4 , 5As shown, the present invention also proposes a cooling device using the above-mentioned anti-condensation control method. The cooling device dissipates heat to the heating component. The heating component includes at least one heating element. The valve 1 is located on the inlet side of the cooling pipe 2. The heating elements are sequentially distributed in series on the outlet side of the cooling pipe 2 along the flow direction of the cooling medium. When the heat generation of the heating elements is different, in order to make full use of the cooling capacity, the heating element with a large heat generation is placed downstream of the heating element with a small heat generation. This ensures that after the low-temperature cooling medium exchanges heat with the heating element with a small heat generation, there is still excess cooling capacity to dissipate heat to the downstream heating element.

[0090] In some embodiments of the present invention, the heating component includes a rectifier module 3, an inverter module 4, and a compressor 5. These three heating components are arranged in ascending order of heat output: rectifier module 3, inverter module 4, and compressor 5. Specifically, the rectifier module 3, inverter module 4, and compressor 5 are connected in series at the outlet side of the cooling pipe 2. The low-temperature cooling medium flowing out of the cooling pipe 2 first flows through the rectifier module 3, then through the inverter module 4, and finally through the compressor 5. The cooling capacity of the cooling medium is effectively utilized, achieving heat dissipation of the heating component with a smaller flow rate. This reduces the impact of the cooling device on the refrigeration unit after it is turned on, and improves the stability of the refrigeration unit.

[0091] like Figure 5 As shown, the present invention also proposes a refrigeration unit 100, which has the aforementioned cooling device. The control module of the refrigeration unit 100 executes the aforementioned anti-condensation control method to control the operating state of the cooling device. See also Figure 5 As shown, the cooling pipe 2 of the cooling device uses the cooling medium in the refrigeration unit. The inlet and outlet sides of the cooling pipe 2 are both connected to the cooling medium circulation loop of the refrigeration unit 100. When the cooling device is turned on, part of the low-temperature cooling medium in the cooling medium circulation loop enters the cooling pipe 2, and the cooling medium flowing out of the cooling pipe 2 is sent back to the cooling medium circulation loop.

[0092] In some embodiments, the refrigeration unit 100 is a centrifugal chiller unit, which employs an air-suspension compressor. The frequency converter and the air-suspension compressor are integrated into one unit. The cooling device piping is connected in series within the heat sinks of the rectifier module 3 and inverter module 4 of the frequency converter and within the air-suspension compressor 5. Temperature sensors are added in parallel to the compressor 5 and the rectifier module 3 and inverter module 4 of the frequency converter. A valve 1 for adjusting the flow rate of the cooling medium is added in series at the inlet end of the cooling pipe 2. A humidity sensor and an ambient temperature sensor are configured within the integrated space. The control module of the centrifugal chiller unit adjusts the opening of the valve 1 in real time based on the parameters detected by the temperature and humidity sensors, thereby achieving automatic control of the cooling medium in the cooling pipe 2. This achieves optimal cooling effect while preventing condensation and ensuring the safe and reliable operation of the refrigeration unit.

[0093] Unlike traditional centrifuge units that use air-cooled or water-cooled cooling solutions, the anti-condensation control method of this invention can automatically activate and adjust during unit operation without adversely affecting the unit. At the same time, it directly uses the cooling medium of the refrigeration unit to dissipate heat from heat-generating components such as the frequency converter and compressor, reducing the cost of the cooling device. Furthermore, it controls the operating status of the cooling device based on the ambient temperature and humidity and the actual temperature of the heat-generating components to prevent condensation, protect the safety of the heat-generating components in real time, and improve the reliability of the centrifuge unit.

[0094] It should be noted that the cooling medium mentioned herein can be refrigerant or water, etc. The terminology used herein is only for describing specific embodiments and is not intended to limit the exemplary embodiments of the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings may be implemented in any order unless a specific order is expressly specified, and as long as the output of the preceding process is not used in the subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0095] Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preventing condensation in a cooling device, wherein the cooling device is used to cool a heating component, characterized in that, The anti-condensation control method includes: The ambient temperature and humidity of the heating element are detected and the dew point temperature T0 is calculated. Determine whether the ambient humidity exceeds the set humidity limit; If so, then the ambient temperature rise action is performed, and the cooling device is turned on when the actual temperature of the heating component is greater than the dew point temperature T0; If not, the cooling device will be activated when the actual temperature of the heating component exceeds the set limit temperature. After the cooling device is turned on, different set control temperatures are selected as the target temperature of the cooling device based on the ambient humidity and the actual temperature of the heating component. The set limit temperature includes a set maximum temperature and a set minimum temperature, and the set control temperature includes a set upper limit temperature and a set lower limit temperature. The set minimum temperature < the set upper limit temperature < the set maximum temperature, and the dew point temperature T0 < the set lower limit temperature ≤ the set minimum temperature. When the ambient humidity exceeds the set humidity limit and the actual temperature of the heating element is greater than the dew point temperature T0, the target temperature is the set upper limit temperature; when the ambient humidity does not exceed the set humidity limit and the actual temperature of the heating element is greater than the set maximum temperature, the target temperature is the set upper limit temperature; when the ambient humidity does not exceed the set humidity limit and the set minimum temperature is less than the actual temperature of the heating element and less than the set maximum temperature, the target temperature is the set lower limit temperature. Adjust the flow rate of the cooling medium in the cooling device to maintain the actual temperature of the heating component at the target temperature.

2. The anti-condensation control method according to claim 1, characterized in that, The anti-condensation control method further includes: If the ambient humidity does not exceed the set humidity limit, the cooling device will be shut off or controlled by microflow when the dew point temperature T0 < the actual temperature of the heating element ≤ the set minimum temperature. And / or if the ambient humidity does not exceed the set humidity limit, then the ambient temperature increase action is performed when the actual temperature of the heating component is ≤ the dew point temperature T0.

3. The anti-condensation control method according to claim 1, characterized in that, The heating component includes at least one heating element, and the actual temperature of the heating component is the highest temperature among all the heating elements.

4. The anti-condensation control method according to claim 3, characterized in that, The cooling device is equipped with a valve for adjusting the flow rate of the cooling medium, the valve opening degree U k =V k +W k ; Among them, V k W is the preset basic opening value. k To correct the opening value, and W k The temperature is dynamically adjusted based on the overheating ΔT of the heating element.

5. The anti-condensation control method according to claim 4, characterized in that, The valve opening adjustment includes: Select the maximum value △Tmax among all the temperature superheat △T of the heating components. Temperature superheat △T is the actual temperature of the heating component minus the ambient temperature of the equipment where the heating component is located before it is turned on. Calculate e(k) = ΔT max -△T 目标 , △T 目标 Subtract the ambient temperature of the device containing the heating element before it is powered on from the target temperature; When e(k) ≤ 0, W k constant; When e(k) > 0, W k = W k-1 +△W k , △W k =K p,h ×[△T max (k)-△T max (k-1) ]+K i,h ×e(k), K p,h K is the proportionality coefficient. i,h is the integral coefficient.

6. The anti-condensation control method according to any one of claims 1 to 5, characterized in that, The dew point temperature is updated each time the ambient temperature and humidity of the heating component are detected. The working state of the cooling device is controlled and / or the target temperature of the cooling device is adjusted based on the updated dew point temperature.

7. The anti-condensation control method according to any one of claims 1 to 5, characterized in that, When performing the ambient temperature increase action, the cooling device is turned off or controlled by a micro-flow rate.

8. The anti-condensation control method according to any one of claims 1 to 5, characterized in that, The ambient temperature increase action is to turn on the compressor to preheat or to turn on the heating device to supply heat to the environment where the heating component is located.

9. A cooling device, comprising: A cooling pipe for circulating cooling medium, and a valve installed on the cooling pipe, the cooling pipe being in contact with a heating component, the valve regulating the flow rate of the cooling medium in the cooling pipe; characterized in that the cooling device employs the anti-condensation control method according to any one of claims 1 to 8.

10. The cooling device according to claim 9, characterized in that, The heating element includes at least one heating component, which is distributed in series along the flow direction of the cooling medium on the inlet side of the cooling pipe, and the valve is located on the outlet side of the cooling pipe.

11. A refrigeration unit, characterized in that, The refrigeration unit has the cooling device as described in claim 9 or 10.

12. The refrigeration unit according to claim 11, characterized in that, The cooling pipes of the cooling device use the cooling medium in the refrigeration unit, and both the inlet and outlet sides of the cooling pipes are connected to the cooling medium circulation loop of the refrigeration unit.

13. The refrigeration unit according to claim 11, characterized in that, The refrigeration unit is a centrifugal chiller unit, which uses an air-suspension compressor. The heating component includes at least one of an air-suspension compressor, an inverter module, and a rectifier module.

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