Cooling system and starting method of cooling system

Abstract

The invention discloses a cooling system and a starting method of the cooling system. The starting method comprises the steps that the environment temperature is obtained; determining whether the environment temperature is higher than a high-temperature set value or not; when it is determined that the environment temperature is higher than the high-temperature set value, a condenser fan is controlled to be started firstly, and then a compressor is controlled to be started; and when it is determined that the environment temperature is lower than or equal to the high-temperature set value, the compressor is controlled to be started firstly, and then the condenser fan is controlled to be started. According to the method, in the high-temperature environment, in the mode that the condenser fan is started in advance to dissipate heat of the condenser, the problem that in the starting process of the compressor, warning is triggered due to too high condensing pressure, and normal starting cannot be achieved can be solved, that is, it is effectively guaranteed that the compressor can be normally started in the high-temperature environment.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and specifically relates to a cooling system and a starting method thereof. Background Art

[0002] With the rapid development of the energy storage industry, different countries and regions have environmental requirements for refrigerants. When using some high-pressure environmental refrigerants, in summer or when the ambient temperature is above 35°C, when the air conditioning system needs to be started to cool the heating load, the starting method is usually to start the compressor first. After the condensation pressure of the condenser reaches the set value, the condenser fan is then turned on for heat dissipation.

[0003] However, in the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art: The above control logic of the air conditioning system can ensure the normal operation of the compressor at normal temperature. However, in the case of a relatively high ambient temperature, as soon as the compressor starts, the condensation pressure of the condenser is very likely to exceed the alarm set value, triggering an alarm and causing the compressor to fail to start. Summary of the Invention

[0004] In order to effectively overcome the problems existing in the above prior art, the main purpose of this application is to provide a cooling system and a starting method thereof that can normally start the compressor in a high-temperature environment.

[0005] In order to achieve the above object, this application specifically adopts the following technical solutions: This application provides a starting method for a cooling system. The cooling system includes a compressor, a condenser, a condenser fan, and a throttling element. The starting method includes: Obtain the ambient temperature; Determine whether the ambient temperature is higher than the high-temperature set value; When it is determined that the ambient temperature is higher than the high-temperature set value, first control the condenser fan to turn on, and then control the compressor to turn on; When it is determined that the ambient temperature is lower than or equal to the high-temperature set value, first control the compressor to turn on, and then control the condenser fan to turn on.

[0006] In some embodiments, the starting method further includes: Determine whether the compressor has the ability and requirement to start; When it is determined that the ambient temperature is higher than the high-temperature set value and the compressor has the ability and requirement to start, first control the condenser fan to turn on, and then control the compressor to turn on.

[0007] In some embodiments, the step of first controlling the condenser fan to start and then controlling the compressor to start includes: Controlling the condenser fan to start; Determining whether the start time of the condenser fan is greater than a preset early start time; When it is determined that the start time of the condenser fan is greater than the preset early start time, controlling the compressor to start.

[0008] In some embodiments, the start method further includes: Determining whether the compressor has the ability and requirement to start; When it is determined that the ambient temperature is lower than or equal to the high temperature set value and the compressor has the ability and requirement to start, first controlling the compressor to start and then controlling the condenser fan to start.

[0009] In some embodiments, the step of first controlling the compressor to start and then controlling the condenser fan to start includes: Controlling the compressor to start; Determining whether the condensation pressure of the compressor is greater than or equal to the start value of the condensation pressure; When it is determined that the condensation pressure of the compressor is greater than or equal to the condensation pressure start point, controlling the condenser fan to start.

[0010] In some embodiments, the obtaining of the ambient temperature is specifically: Obtaining the ambient temperature through a temperature sensor.

[0011] In some embodiments, the obtaining of the ambient temperature is specifically: Calculating the ambient temperature based on the condensation pressure of the compressor, or calculating the ambient temperature based on the condensation temperature of the condenser and the compensation temperature.

[0012] Correspondingly, the present application further provides a cooling system, which includes: A plate heat exchanger; A refrigerant circulation pipeline, which is connected to the plate heat exchanger, and the cooling circulation pipeline includes a condenser, a compressor and a throttling element, and the condenser is configured with a condenser fan; A cooling water circulation pipeline, which is connected to the plate heat exchanger, so that the cooling water in the cooling water circulation pipeline and the refrigerant in the refrigerant circulation pipeline can perform heat exchange in the plate heat exchanger; A controller, which is respectively connected to the condenser fan and the compressor. The controller is used to obtain the ambient temperature, compare the ambient temperature with a high-temperature set value. When it is determined that the ambient temperature is higher than the high-temperature set value, the condenser fan is first controlled to start, and then the compressor is controlled to start; when it is determined that the ambient temperature is lower than or equal to the high-temperature set value, the compressor is first controlled to start, and then the condenser fan is controlled to start.

[0013] In some embodiments, the cooling system further includes a temperature sensor, which is connected to the controller. The temperature sensor is used to detect the ambient temperature and transmit it to the controller.

[0014] In some embodiments, the plate heat exchanger is provided with a first channel and a second channel. There are two first channels, and the two first channels are respectively located on both sides of the second channel. The cooling water circulation pipeline is connected to the second channel, and there are two refrigerant circulation pipelines, and the two refrigerant circulation pipelines are respectively connected to the two first channels.

[0015] Compared with the prior art, the technical solution provided by the present application has at least the following beneficial effects: The present application obtains the ambient temperature, then determines whether the ambient temperature is higher than the high-temperature set value. When it is determined that the ambient temperature is higher than the high-temperature set value, the condenser fan is first controlled to start, and then the compressor is controlled to start. When it is determined that the ambient temperature is lower than or equal to the high-temperature set value, the compressor is first controlled to start, and then the condenser fan is controlled to start. It can be seen that in a high-temperature environment, by enabling the condenser fan to start in advance to dissipate heat from the condenser, the present application can improve the problem that the compressor cannot start normally due to an alarm triggered by too high a condensation pressure during the starting process, that is, the present application effectively ensures that the compressor can start normally in a high-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the cooling system provided by the embodiment of the present application.

[0017] Figure 2 It is a flowchart of the starting method of the cooling system provided by the embodiment of the present application.

[0018] REFERENCE SIGNS 1, plate heat exchanger; 2, refrigerant circulation pipeline; 21, compressor; 22, condenser; 23, condenser fan; 24, throttling element; 3, cooling water circulation pipeline; 31, water pump; 32, electric heater. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application 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 application and are not used to limit the present application.

[0020] In the description of the present application, unless otherwise clearly defined and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "plural" means two or more; the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" 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 those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0021] In the description of this specification, it should be understood that the orientation terms such as "upper" and "lower" described in the embodiments of the present application are described from the angles shown in the drawings and should not be construed 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 "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0022] In the related art, the cooling system usually does not configure a temperature sensor to detect the ambient temperature, and the starting mode of the cooling system is usually to start the compressor first. When the condensation pressure of the condenser (the condensation pressure refers to the pressure at which the refrigerant condenses from a gaseous state to a liquid state in the condenser) reaches the set value, then start the condenser fan for heat dissipation. This starting mode can ensure the normal operation of the compressor at normal temperature, but in summer or when the ambient temperature is as high as 35°C, as soon as the compressor starts, the condensation pressure of the condenser is very likely to exceed the alarm set value, triggering an alarm and causing the compressor to fail to start. Considering the operating conditions of the on-site high-temperature environment, in order to solve the problem that the compressor of the cooling system is prone to trigger an alarm of too high condensation pressure during startup, resulting in the compressor not being able to start, the present application proposes a method under high-temperature conditions. By detecting whether the ambient temperature is a high-temperature situation, when the ambient temperature is high, the condenser fan is turned on in advance to dissipate heat from the condenser for a period of time, and then the compressor is started, so as to ensure that the compressor of the cooling system can be normally started for refrigeration under high-temperature conditions.

[0023] Refer to Figure 1As shown, embodiments of the present application disclose a cooling system, which includes a plate heat exchanger 1, a refrigerant circulation pipeline 2, a cooling water circulation pipeline 3, and a controller. The refrigerant circulation pipeline 2 and the cooling water circulation pipeline 3 are respectively connected to the plate heat exchanger 1, enabling the cooling water in the cooling water circulation pipeline 3 and the refrigerant in the refrigerant circulation pipeline 2 to conduct heat exchange in the plate heat exchanger 1, thereby reducing the temperature of the cooling water in the cooling water circulation pipeline 3. The cooling water circulation pipeline 3 is used to cool the load. The controller is respectively connected to the refrigerant circulation pipeline 2 and the cooling water circulation pipeline 3, and is used to control the operation of the refrigerant circulation pipeline 2 and the cooling water circulation pipeline 3.

[0024] Specifically, the plate heat exchanger 1 is provided with a first channel and a second channel. The refrigerant circulation pipeline 2 includes a condenser 22, a compressor 21, and a throttling element 24. The condenser 22 is configured with a condenser fan 23, that is, the cooling system includes the condenser fan 23. The input end of the compressor 21 is connected to the output end of the first channel of the plate heat exchanger 1, the output end of the compressor 21 is connected to the input end of the condenser 22, the output end of the condenser 22 is connected to the input end of the throttling element 24, and the output end of the throttling element 24 is connected to the input end of the first channel of the plate heat exchanger 1. The condenser fan 23 is arranged on one side of the condenser 22 and is used to accelerate the heat exchange between the refrigerant in the condenser 22 and the surrounding air. The cooling water circulation pipeline 3 includes a water pump 31 and an electric heater 32. The input end of the water pump 31 can be connected to the load end. The output end of the water pump 31 is connected to the input end of the electric heater 32. The output end of the electric heater is connected to the input end of the second channel of the plate heat exchanger. The output end of the second channel of the plate heat exchanger 1 can be connected to the load end. The controller is connected to the condenser fan 23, the compressor 21, the water pump 31, and the electric heater 32, and is used to control the operation of the condenser fan 23, the compressor 21, the water pump 31, and the electric heater 32.

[0025] During refrigeration, the electric heater 32 does not work. The refrigerant in the refrigerant circulation pipeline 2 and the cooling water in the cooling water circulation pipeline 3 exchange heat in the plate heat exchanger 1, reducing the temperature of the cooling water and increasing the temperature of the refrigerant, changing the liquid refrigerant into a gaseous refrigerant. The cooling water with reduced temperature flows out of the plate heat exchanger 1 under the action of the water pump 31, flows through the load, exchanges heat with the load, thereby cooling the load. Then, the cooling water that has absorbed the heat of the load flows back to the plate heat exchanger 1 and continues to exchange heat with the refrigerant. The gaseous refrigerant with increased temperature flows out of the plate heat exchanger 1 to the compressor 21. The compressor 21 compresses the gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flows to the condenser 22. In the condenser 22, the high-temperature and high-pressure gaseous refrigerant releases heat to the surrounding air and turns into a low-temperature liquid refrigerant. The low-temperature liquid refrigerant flows to the plate heat exchanger 1 after throttling and pressure reduction by the throttling element 24 and continues to exchange heat with the cooling water. During heating, the refrigerant circulation pipeline is not started, and the electric heater 32 is started, so that the cooling water is heated and then flows to the load to heat the load.

[0026] In this embodiment, the plate heat exchanger 1 is provided with two first channels, and the two first channels are respectively located on both sides of the second channel. There are two refrigerant circulation pipelines 2, and the two refrigerant circulation pipelines 2 are respectively connected to the two first channels. By providing two first channels in this embodiment, with the two first channels located on both sides of the second channel, the two refrigerant circulation pipelines 2 respectively connected to the two first channels, and the cooling water circulation pipeline 3 connected to the second channel, the heat exchange effect between the cooling water and the refrigerant in the plate heat exchanger 1 can be improved.

[0027] In order to enable the cooling system to start and operate normally in a high-temperature environment, the cooling system further includes a temperature sensor. The temperature sensor is connected to the controller. The temperature sensor is used to detect the ambient temperature and transmit it to the controller, so that the start mode of the cooling system can be controlled according to the specific situation of the ambient temperature. For example, the start sequence of the compressor 21 and the cooler fan 23 can be controlled.

[0028] In some other embodiments, the ambient temperature can also be calculated based on the condensation pressure of the compressor 21, or the ambient temperature can be calculated based on the condensation temperature of the condenser 22 and the compensation temperature.

[0029] When starting the cooling system, the ambient temperature can be detected by the temperature sensor and the detection result can be transmitted to the controller. The controller compares the ambient temperature detected by the temperature sensor with the high-temperature set value. When it is determined that the ambient temperature is higher than the high-temperature set value (the high-temperature set value can be set to, for example, 35°C), first control the condenser fan 23 to turn on for a preset time, and then control the compressor 21 to turn on. When it is determined that the ambient temperature is lower than or equal to the high-temperature set value, first control the compressor 21 to turn on, and then control the condenser fan 23 to turn on.

[0030] Under the high-temperature environmental conditions of this application, when it is determined that the compressor 21 has the ability and demand, the ambient temperature at this time is locked, and it is judged whether the ambient temperature at this time is greater than the high-temperature set value. If the ambient temperature is greater than the high-temperature set value, the condenser fan 23 is started first, and then the compressor 21 is started, so as to ensure that the compressor 21 can be normally started and operated in a high-temperature environment.

[0031] Refer to Figure 2 As shown, correspondingly, the embodiment of the present application also discloses a starting method for a cooling system, which can be applied to the cooling system described in the above embodiment. The starting method includes the steps: S11. Obtain the ambient temperature.

[0032] Specifically, the ambient temperature can be detected by a temperature sensor, or the condensation saturation temperature can be calculated based on the condensation pressure of the condenser, and then the ambient temperature can be calculated based on the condensation saturation temperature and the compensation temperature, or the ambient temperature can be calculated based on the condensation temperature and the compensation temperature of the condenser.

[0033] S12. Determine whether the ambient temperature is higher than the high-temperature set value. When it is determined that the ambient temperature is higher than the high-temperature set value, step S13 is performed; otherwise, step S17 is performed.

[0034] Among them, the high-temperature set value can be preset according to the actual situation. For example, it can be set to 35°C, 38°C, 40°C, etc.

[0035] S13. Determine whether the compressor has the ability and demand to start. When it is determined that the compressor has the ability and demand to start, step S14 is performed, and then step S15 is performed; otherwise, return to step S13.

[0036] Among them, the compressor having the ability to start can mean that the compressor does not have a fault alarm or is not in a protection lock state, and the off-time (or shutdown interval time) reaches a preset value. The compressor having a demand can mean that the outlet water temperature or the return water temperature or the monitoring temperature sent by the upper computer exceeds the set value, that is, the cooling system has a refrigeration demand.

[0037] S14. Control the condenser fan to turn on.

[0038] S15. Determine whether the opening time of the condenser fan is greater than the early start set time. When it is determined that the opening time of the condenser fan is greater than the early start set time, step S16 is performed; otherwise, return to step S15.

[0039] Among them, the early start set time is a pre-set time. Exemplarily, the early start set time can be set to 30 seconds. If the start time of the condenser fan is 25 seconds, it is determined that the start time of the condenser fan is less than the early start set time; if the start time of the condenser fan is 35 seconds, it is determined that the start time of the condenser fan is greater than the early start set time.

[0040] S16. Control the compressor to start.

[0041] S17. Determine whether the compressor has the starting ability and demand. When it is determined that the compressor has the starting ability and demand, proceed to step S18; otherwise, return to step S17.

[0042] S18. Control the compressor to start.

[0043] S19. Determine whether the condensation pressure of the compressor is greater than or equal to the starting value of the condensation pressure. When it is determined that the condensation pressure of the compressor is greater than or equal to the starting value of the condensation pressure, proceed to step S20; otherwise, return to step S19.

[0044] Among them, the starting value of the condensation pressure is a pre-set condensation pressure value.

[0045] S20. Control the condenser fan to start.

[0046] In this embodiment, first perform step S12, and then perform steps S13 and S17, that is, first determine whether the ambient temperature is higher than the high-temperature set value, and then determine whether the compressor has the starting ability and demand. Of course, in other embodiments, steps S13 and S17 can also be performed first, and then step S12, that is, first determine whether the compressor has the starting ability and demand, and then determine whether the ambient temperature is higher than the high-temperature set value.

[0047] It can be seen from the above that the present application adds ambient temperature detection to the control logic of the condenser fan. If the detected ambient temperature is greater than the high-temperature set value and the compressor has the ability and demand to start, first start the condenser fan, let the condenser fan run at a set speed for a period of time, and then start the compressor. After the compressor starts and runs for a period of time, the speed can be adjusted according to the condensation pressure of the compressor. The present application enables the condenser fan to start in advance to dissipate heat from the condenser in a high-temperature environment, thereby effectively solving the problem that the condensation pressure is too high during the starting process of the compressor and triggering an alarm and unable to start normally under high-temperature environment conditions.

[0048] As described above, it is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A starting method for a cooling system, the cooling system comprising a compressor, a condenser, a condenser fan, and a throttling element; characterized in that, The starting method includes: Obtain the ambient temperature; Determine whether the ambient temperature is higher than the high-temperature set value; When it is determined that the ambient temperature is higher than the high-temperature set value, first control the condenser fan to turn on, and then control the compressor to turn on; When it is determined that the ambient temperature is lower than or equal to the high-temperature set value, first control the compressor to turn on, and then control the condenser fan to turn on.

2. The startup method according to claim 1, wherein The starting method further includes: Determine whether the compressor has the ability and requirement to turn on; When it is determined that the ambient temperature is higher than the high-temperature set value and the compressor has the ability and requirement to turn on, first control the condenser fan to turn on, and then control the compressor to turn on.

3. The startup method according to claim 2, characterized in that The step of first controlling the condenser fan to turn on and then controlling the compressor to turn on includes: Control the condenser fan to turn on; Determine whether the starting time of the condenser fan is greater than the early-start set time; When it is determined that the starting time of the condenser fan is greater than the early-start set time, control the compressor to turn on.

4. The startup method according to claim 1, wherein The starting method further includes: Determine whether the compressor has the ability and requirement to turn on; When it is determined that the ambient temperature is lower than or equal to the high-temperature set value and the compressor has the ability and requirement to turn on, first control the compressor to turn on, and then control the condenser fan to turn on.

5. The starting method according to claim 4, characterized in that The step of first controlling the compressor to turn on and then controlling the condenser fan to turn on includes: Control the compressor to turn on; Determine whether the condensation pressure of the compressor is greater than or equal to the opening value of the condensation pressure; When it is determined that the condensation pressure of the compressor is greater than or equal to the condensation pressure opening point, control the condenser fan to turn on.

6. The starting method according to any one of claims 1 to 5, characterized in that, The obtaining of the ambient temperature is specifically: Obtain the ambient temperature through a temperature sensor.

7. The starting method according to any one of claims 1 to 5, characterized in that The obtaining of the ambient temperature is specifically: Convert the ambient temperature based on the condensation pressure of the compressor, or convert the ambient temperature based on the condensation temperature of the condenser and the compensation temperature.

8. A cooling system, characterized in that, It includes: A plate heat exchanger; A refrigerant circulation pipeline, the refrigerant circulation pipeline is connected to the plate heat exchanger, and the cooling circulation pipeline includes a condenser, a compressor and a throttling element, and the condenser is configured with a condenser fan; A cooling water circulation pipeline, the cooling water circulation pipeline is connected to the plate heat exchanger, so that the cooling water in the cooling water circulation pipeline can exchange heat with the refrigerant in the refrigerant circulation pipeline in the plate heat exchange; A controller, the controller is respectively connected to the condenser fan and the compressor, the controller is used to obtain the ambient temperature, and compare the ambient temperature with the high-temperature set value. When it is determined that the ambient temperature is higher than the high-temperature set value, first control the condenser fan to turn on, and then control the compressor to turn on; when it is determined that the ambient temperature is lower than or equal to the high-temperature set value, first control the compressor to turn on, and then control the condenser fan to turn on.

9. The cooling system according to claim 8, characterized in that, The cooling system further includes a temperature sensor, the temperature sensor is connected to the controller, and the temperature sensor is used to detect the ambient temperature and transmit it to the controller.

10. The cooling system according to claim 8, characterized in that, The plate heat exchanger is provided with a first channel and a second channel. There are two first channels, and the two first channels are respectively located on both sides of the second channel. The cooling water circulation pipeline is connected to the second channel. There are two refrigerant circulation pipelines, and the two refrigerant circulation pipelines are respectively connected to the two first channels.

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