Energy-saving method and system for electric cabinet air conditioner

Abstract

The technical scheme adopted by the present application is: an energy-saving method and system of an electric cabinet air conditioner, comprising the following steps: determining a reference temperature range of air conditioner refrigeration; the air conditioner reference temperature meets the working temperature requirements of all electrical components in the electric cabinet; selecting a test temperature in the air conditioner reference temperature range and sequentially carrying out energy-saving tests; the energy-saving test is used to obtain the surrounding temperature changes of all electrical components in the electric cabinet within a set time after setting the test temperature as the air conditioner opening temperature; according to the results of the energy-saving test, the test temperature that makes the maximum surrounding temperature of all electrical components in the electric cabinet within the set time in the air conditioner reference temperature range is selected as the optimal temperature, and the air conditioner opening temperature is set to the optimal temperature. The present application is suitable for all places where the electric cabinet adopts air conditioner refrigeration, effectively realizes energy saving, and is convenient for popularization to the whole society.

Description

Technical Field

[0001] This invention belongs to the field of electrical cabinet air conditioning technology, and specifically relates to an energy-saving method for electrical cabinet air conditioning. Background Technology

[0002] Currently, air conditioning is commonly used for cooling in electrical cabinets in engine cylinder head and cylinder block machining workshops. However, there is no unified industry standard for determining the appropriate operating temperature for this air conditioning system, what standard to use to measure the temperature inside the cabinet, and whether the air conditioning is over-cooling or under-cooling the environment. Currently, there is no clear industry standard for the operating temperature of the air conditioning system; to protect the electrical components inside the cabinet, a standard operating temperature of 30°C is generally used. However, setting the operating temperature too low will inevitably lead to over-cooling of the cabinet, resulting in unnecessary energy waste. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the aforementioned background technology and provide an energy-saving method for air conditioning cabinets, applicable to all places where air conditioning is used for cooling cabinets, effectively achieving energy saving.

[0004] The technical solution adopted in this invention is: an energy-saving method for an electrical cabinet air conditioner, comprising the following steps:

[0005] Determine the reference temperature range for the air conditioner; the air conditioner is an external cabinet air conditioner, which exists in two forms: side-mounted in the cabinet or placed on top of the cabinet; the internal circulation of the air conditioner is used to cool all electrical components inside the cabinet; the reference temperature of the air conditioner meets the temperature requirements of all electrical components inside the cabinet.

[0006] Select test temperatures within the air conditioner reference temperature range and conduct energy-saving tests sequentially.

[0007] The energy-saving test is used to obtain the ambient temperature change of all electrical components inside the cabinet within a set time after the test temperature is set to the air conditioner's on temperature.

[0008] Based on the results of the energy-saving test, the optimal temperature was selected as the test temperature at which the maximum ambient temperature of all electrical components inside the cabinet was within the air conditioner reference temperature range for a set time. The air conditioner's operating temperature was then set as the optimal temperature.

[0009] In the above technical solution, the process of determining the air conditioner reference temperature range includes: obtaining the suitable operating temperature range of all electrical components inside the electrical cabinet, and determining the common range of all suitable operating temperature ranges as the air conditioner reference temperature range.

[0010] In the above technical solution, the suitable operating temperature range of all electrical components in the electrical cabinet is obtained by referring to the instruction manuals of the electrical components.

[0011] In the above technical solution, the energy-saving test process includes: setting the test temperature to the air conditioner's operating temperature, starting all electrical components inside the electrical cabinet and acquiring the ambient temperature of all electrical components inside the electrical cabinet in real time to form a corresponding temperature curve; the horizontal axis of the temperature curve is the detection time, and the vertical axis is the temperature detection value; the highest point in the temperature curve is taken as the maximum temperature value of the corresponding electrical component.

[0012] In the above technical solution, the time set during the energy-saving test is 24 hours.

[0013] In the above technical solution, a temperature sensor is installed at the exhaust port of each electrical component to obtain the real-time ambient temperature of the corresponding electrical component.

[0014] In the above technical solution, the maximum value of the common interval of all suitable operating temperature ranges is rounded up, and the minimum value of the common interval is rounded down to determine the air conditioning reference temperature range.

[0015] In the above technical solution, the process of selecting test temperatures within the air conditioner reference temperature range and conducting energy-saving tests sequentially includes: taking all integer values ​​within the air conditioner reference temperature range as rough test temperatures; and sorting the rough test temperatures in ascending order of value.

[0016] Energy-saving tests were conducted by selecting approximate test temperatures in sequence:

[0017] If, after setting any rough test temperature as the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet within a set time is lower than the minimum value of the air conditioner's reference temperature range, then the next rough test temperature will be used as the air conditioner's operating temperature to conduct the energy-saving test.

[0018] If, after setting any rough test temperature to the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet within a set time period is higher than the maximum value of the air conditioner's reference temperature range, then the interval formed by the previous rough test temperature and this rough test temperature will be taken as the precise test temperature range.

[0019] The precise test temperature range is divided according to the set numerical intervals to obtain the precise test temperature; the precise test temperatures are sorted in ascending order of numerical value.

[0020] Energy-saving tests were conducted by selecting precise test temperatures in sequence:

[0021] If, after setting any precise test temperature as the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet is lower than the minimum value of the air conditioner's reference temperature range within a set time, then the next precise test temperature will be used as the air conditioner's operating temperature to conduct the energy-saving test.

[0022] If, after setting any precise test temperature to the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet within a set time period is higher than the maximum value of the air conditioner's reference temperature range, then the previous precise test temperature will be taken as the optimal temperature.

[0023] In the above technical solution, the air conditioner is an external cabinet air conditioner, which is mounted on the side of the cabinet or placed on the top of the cabinet; the air conditioner includes a compressor, condenser, and dryer filter installed inside the cabinet, and an expansion valve and evaporator installed outside the cabinet; the compressor, condenser, dryer filter, and expansion valve and evaporator installed outside the cabinet are connected in sequence through pipelines to form a circulation loop.

[0024] In the above technical solution, the numerical interval is set to 0.1℃.

[0025] The present invention also provides an energy-saving system for an electrical cabinet air conditioner, which is used to implement the energy-saving method for the electrical cabinet air conditioner described in the above technical solution.

[0026] The beneficial effects of this invention are: it is applicable to all locations where electrical cabinets use air conditioning for cooling, effectively achieving energy conservation while meeting the cooling needs of electrical components within the cabinet. This invention determines the air conditioning reference temperature range by identifying the suitable operating temperature ranges of all electrical components, ensuring that the air conditioning's operating temperature meets the needs of all electrical components within the cabinet. This invention obtains the suitable operating temperature ranges of the electrical components from their instruction manuals, ensuring the accuracy of the determined air conditioning reference temperature range. The energy-saving test of this invention detects the ambient temperature changes of all electrical components at different temperatures, identifying the temperature that simultaneously meets the safety and energy-saving requirements of the electrical components, ensuring that the final set air conditioning operating temperature effectively cools while maximizing energy savings. This invention sets the energy-saving test time to 24 hours, fully considering the diurnal temperature variation and avoiding the impact of daytime and nighttime workshop ambient temperature changes on the temperature changes within the electrical cabinet, further ensuring the authenticity of the energy-saving test. This invention places the temperature sensor at the location with the highest heat generation within the electrical cabinet, ensuring the reliability of the test results. This invention determines the air conditioning reference temperature range by rounding down and up, facilitating subsequent energy-saving tests and providing overall process convenience. This invention combines coarse and fine selection methods to accurately locate the precise temperature that meets the cooling and energy-saving requirements of electrical components, thereby maximizing energy savings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the method flow of the present invention;

[0028] Figure 2 This is a schematic diagram of the system modules of the present invention;

[0029] Figure 3 A schematic diagram illustrating the relationship between air conditioning temperature and energy consumption;

[0030] Figure 4 This is a schematic diagram of the air conditioner's circulation in a specific embodiment. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0032] like Figure 1 As shown, the present invention provides an energy-saving method for an electrical cabinet air conditioner, comprising the following steps:

[0033] The reference temperature range for the air conditioner is determined; the air conditioner is an external cabinet air conditioner, which exists in two forms: side-mounted in the cabinet or placed on top of the cabinet. The internal circulation of the air conditioner is used to cool all electrical components inside the cabinet; the air conditioner has a built-in temperature sensor that can detect the ambient temperature and automatically turn on when the ambient temperature reaches the activation temperature; the reference temperature of the air conditioner meets the temperature requirements of all electrical components inside the cabinet.

[0034] Select test temperatures within the air conditioner reference temperature range and conduct energy-saving tests sequentially.

[0035] The energy-saving test is used to obtain the ambient temperature change of all electrical components inside the cabinet within a set time after the test temperature is set to the air conditioner's on temperature.

[0036] Based on the results of the energy-saving test, the optimal temperature was selected as the test temperature at which the maximum ambient temperature of all electrical components inside the cabinet was within the air conditioner reference temperature range for a set time. The air conditioner's operating temperature was then set as the optimal temperature.

[0037] Specifically, the process of determining the air conditioner reference temperature range includes: obtaining the suitable operating temperature ranges of all electrical components inside the electrical cabinet, and determining the common range of all suitable operating temperature ranges as the air conditioner reference temperature range. This invention determines the air conditioner reference temperature range by using the suitable operating temperature ranges of all electrical components, ensuring that the air conditioner's operating temperature meets the needs of all electrical components inside the electrical cabinet.

[0038] Specifically, the suitable operating temperature ranges for all electrical components within the electrical cabinet are obtained through the instruction manuals of the electrical components. This invention ensures the accuracy of the determined air conditioning reference temperature range by obtaining the suitable operating temperature ranges for each electrical component from its instruction manual.

[0039] Specifically, the energy-saving test process includes: setting the test temperature to the air conditioner's operating temperature, activating all electrical components inside the electrical cabinet, and acquiring the ambient temperature of all electrical components inside the cabinet in real time to generate a corresponding temperature curve; the horizontal axis of the temperature curve represents the detection time, and the vertical axis represents the temperature detection value; the highest point in the temperature curve is taken as the maximum ambient temperature value of the corresponding electrical component. This invention's energy-saving test, by detecting the ambient temperature changes of all electrical components at different temperatures, identifies the temperature that simultaneously meets the safety and energy-saving requirements of the electrical components, ensuring that the final set air conditioner operating temperature can effectively lower the temperature while maximizing energy savings.

[0040] Specifically, the energy-saving test is set for 24 hours. This invention sets the energy-saving test time to 24 hours, fully considering the diurnal temperature variation and avoiding the impact of day-night workshop ambient temperature changes on the temperature inside the electrical cabinet, thus further ensuring the authenticity of the energy-saving test.

[0041] Specifically, a temperature sensor is installed at the exhaust vent of each electrical component to obtain the real-time ambient temperature of the corresponding component. This invention places the temperature sensors at the locations within the electrical cabinet where heat generation is highest, ensuring the reliability of the detection results.

[0042] Specifically, the maximum value of the common interval of all suitable operating temperature ranges is rounded up, and the minimum value of the common interval is rounded down to determine the air conditioning reference temperature range. This invention determines the air conditioning reference temperature range by rounding up and down, which facilitates subsequent energy-saving tests and improves the overall process convenience.

[0043] Specifically, the process of selecting test temperatures within the air conditioning reference temperature range and conducting energy-saving tests sequentially includes: using all integer values ​​within the air conditioning reference temperature range as rough test temperatures; and sorting the rough test temperatures in ascending order of value.

[0044] Energy-saving tests were conducted by selecting approximate test temperatures in sequence:

[0045] If, after setting any rough test temperature as the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet within a set time is lower than the minimum value of the air conditioner's reference temperature range, then the next rough test temperature will be used as the air conditioner's operating temperature to conduct the energy-saving test.

[0046] If, after setting any rough test temperature to the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet within a set time period is higher than the maximum value of the air conditioner's reference temperature range, then the interval formed by the previous rough test temperature and this rough test temperature will be taken as the precise test temperature range.

[0047] The precise test temperature range is divided according to the set numerical intervals to obtain the precise test temperature; the precise test temperatures are sorted in ascending order of numerical value.

[0048] Energy-saving tests were conducted by selecting precise test temperatures in sequence:

[0049] If, after setting any precise test temperature as the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet is lower than the minimum value of the air conditioner's reference temperature range within a set time, then the next precise test temperature will be used as the air conditioner's operating temperature to conduct the energy-saving test.

[0050] If, after setting any precise test temperature to the air conditioner's operating temperature, the maximum temperature detected around any electrical component in the electrical cabinet within a set time period is higher than the maximum value of the air conditioner's reference temperature range, then the previous precise test temperature will be taken as the optimal temperature.

[0051] This invention combines coarse and fine selection methods to accurately locate the precise temperature that meets the cooling and energy-saving requirements of electrical components, thereby maximizing energy savings.

[0052] Specifically, the set numerical interval is 0.1℃, further ensuring maximum energy saving.

[0053] like Figure 2 As shown, the present invention also provides an energy-saving system for an electrical cabinet air conditioner. This system is used to implement the energy-saving method for the electrical cabinet air conditioner described in the above technical solution, and includes a temperature sensor, a calculation module, an electrical cabinet air conditioner, and a power meter.

[0054] The principles of the present invention will be further explained below with reference to specific embodiments.

[0055] Electrical components generate heat during operation. Some of this heat is dissipated to the surrounding environment through the electrical cabinet, while the remaining heat is forcibly cooled by air conditioning. It is well known that electrical components have specified operating ambient temperatures. For example: frequency converters: MAX 55℃, air switches: MAX 40℃, contactors: MAX 55℃, servo controllers: MAX 50℃. However, capacitors, which are the most commonly used components, are not heat-resistant and are subject to the "10℃, 2x speed" rule: ambient temperature directly affects the lifespan of capacitors; a 10℃ decrease doubles the lifespan, while a 10℃ increase halves it.

[0056] This specific embodiment, by consulting the instruction manuals of the electrical components and integrating the suitable operating temperatures of all electrical components in the electrical cabinet, determines a temperature range that meets the operating requirements of the electrical components while maximizing energy conservation. Considering energy conservation and the normal service life requirements of electrical components, this specific embodiment specifies the ambient temperature standard for the electrical components inside the cabinet as 37.5℃-38.5℃.

[0057] To enhance energy-saving effects, the following settings were implemented in this specific embodiment:

[0058] To ensure the proper functioning of the air conditioner cabinet, the heat dissipation fins, air inlet, and air outlet must be clean and free of oil mist; this is essential for energy conservation. Figure 4 As shown, the air conditioner in this specific embodiment is an external cabinet air conditioner, which has two forms: side-mounted in the cabinet or placed on top of the cabinet. The air conditioner includes a compressor, condenser, and dryer filter installed inside the cabinet, and an expansion valve and evaporator installed outside the cabinet. The compressor, condenser, dryer filter, and expansion valve and evaporator installed outside the cabinet are connected in sequence through pipelines to form a circulation loop.

[0059] Meanwhile, maintain a distance between the air outlet and air inlet of the air conditioner to prevent hot air blown out of the air conditioner outlet from re-entering through the air inlet. This severely affects the cooling effect and wastes energy. Furthermore, the layout of electrical components inside the cabinet should not obstruct the air conditioner outlet; otherwise, it will affect the circulation of cold air within the cabinet, resulting in poor cooling performance. When the air conditioner is cooling, avoid leaving the cabinet door loosely closed or having any openings in other parts of the cabinet, as this could cause the cold air inside the cabinet to exchange with the ambient air in the workshop.

[0060] Research indicates that the CPU heat sink, inverter heat sink, and servo controller heat sink of the PLC are the electrical components that generate the most heat within the electrical cabinet. In this specific embodiment, a thermometer with recording function is used to monitor these components for 24 hours. The thermometer is placed at the exhaust vent of the electrical components, and the readings are transmitted to the calculation module.

[0061] The thermometer records one temperature reading per minute. Simultaneously, a power meter records the air conditioner's energy consumption and feeds the results back to the calculation module for easy comparison of energy-saving data later. The time points for recording air conditioner energy consumption are consistent with those for recording temperature.

[0062] Three temperatures, 37℃, 38℃ and 39℃, were used as rough test temperatures.

[0063] First, set the air conditioner to 37℃, then start all electrical components in the cabinet, and collect the ambient temperature of all electrical components in the cabinet in real time over 24 hours.

[0064] The calculation module generates a temperature curve for each electrical component based on the collected temperature data and determines the maximum ambient temperature of each electrical component within 24 hours.

[0065] In this specific embodiment, it was found that the maximum ambient temperature of some electrical components did not exceed 37.5°C. Therefore, it is still necessary to set 38°C as the air conditioner's operating temperature and repeat the above steps.

[0066] In this specific embodiment, it was found that after setting the air conditioner's operating temperature to 38°C, the maximum ambient temperature of some electrical components exceeded 38.5°C within 24 hours.

[0067] All temperature ranges that can be determined to be 37℃-38℃ are considered the precise test temperature ranges.

[0068] This specific embodiment starts at 37.1°C and conducts energy-saving tests on temperature values ​​within a precise test temperature range, increasing by 0.1°C each time.

[0069] In this specific embodiment, when 37.5°C is set as the air conditioner's operating temperature, the maximum ambient temperature detected by the components within 24 hours is higher than 37.5°C and lower than 38.5°C.

[0070] However, when the air conditioner is set to 37.6 degrees Celsius as its operating temperature, a very small number of components will detect a maximum value higher than 38.5 degrees Celsius within 24 hours.

[0071] Therefore, in this specific embodiment, 37.5℃ was ultimately determined as the optimal temperature, and it was set as the start-up temperature of the cabinet air conditioner.

[0072] When resetting the air conditioner's cooling start temperature, the air conditioner's power consumption is measured to easily confirm the change in energy consumption before and after optimization using this invention.

[0073] Figure 3 It demonstrates the relationship between the air conditioner's cooling start-up setting temperature and energy consumption, as well as the temperature inside the cabinet.

[0074] The broken line represents the temperature data at the exhaust vents of different "high heat dissipation" electrical components inside the cabinet, while the "bar" graph represents the power consumption data of the compressor.

[0075] from Figure 3 As can be seen, as the operating temperature of the air conditioner cabinet increases, the temperature inside the cabinet also increases, and the compressor's operating time decreases significantly. When the compressor is working (consuming power), the temperature inside the cabinet gradually decreases; when the compressor stops working, the temperature inside the cabinet gradually increases.

[0076] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. An energy-saving method for an electrical cabinet air conditioner, characterized in that: Includes the following steps: The reference temperature range of the air conditioner is determined; the internal circulation of the air conditioner is used to cool all electrical components inside the electrical cabinet; the reference temperature of the air conditioner meets the ambient temperature requirements of all electrical components inside the electrical cabinet. Select test temperatures within the air conditioner reference temperature range and conduct energy-saving tests sequentially. The energy-saving test is used to obtain the ambient temperature change of all electrical components inside the cabinet within a set time after the test temperature is set to the air conditioner's operating temperature. Based on the results of the energy-saving test, the optimal temperature was selected as the test temperature at which the maximum ambient temperature of all electrical components inside the cabinet was within the air conditioner reference temperature range within a set time. The air conditioner start temperature was then set as the optimal temperature. The process of selecting test temperatures within the air conditioner reference temperature range and conducting energy-saving tests sequentially includes: taking all integer values ​​within the air conditioner reference temperature range as rough test temperatures; and sorting the rough test temperatures in ascending order of value. Energy-saving tests were conducted by selecting approximate test temperatures in sequence: If, after setting any rough test temperature as the air conditioner's operating temperature, the maximum ambient temperature of any electrical component in the electrical cabinet is lower than the minimum value of the air conditioner's reference temperature range within a set time, then the next rough test temperature will be used as the air conditioner's operating temperature to conduct the energy-saving test. If, after setting any rough test temperature to the air conditioner's operating temperature, the maximum ambient temperature detected around any electrical component in the electrical cabinet is higher than the maximum value of the air conditioner's reference temperature range within a set time, then the range formed by the previous rough test temperature and this rough test temperature will be taken as the precise test temperature range. The precise test temperature range is divided according to the set numerical intervals to obtain the precise test temperature; the precise test temperatures are sorted in ascending order of numerical value. Energy-saving tests were conducted by selecting precise test temperatures in sequence: If, after setting any precise test temperature as the air conditioner's operating temperature, the maximum temperature of any electrical component in the electrical cabinet is lower than the minimum value of the air conditioner's reference temperature range within a set time, then the next precise test temperature will be used as the air conditioner's operating temperature for the energy-saving test. If, after setting any precise test temperature to the air conditioner's operating temperature, the maximum temperature detected by any electrical component in the electrical cabinet within a set time period is higher than the maximum value of the air conditioner's reference temperature range, then the previous precise test temperature will be taken as the optimal temperature.

2. The method according to claim 1, characterized in that: The process of determining the air conditioner reference temperature range includes: obtaining the suitable operating temperature range of all electrical components inside the electrical cabinet, and determining the common range of all suitable operating temperature ranges as the air conditioner reference temperature range.

3. The method according to claim 2, characterized in that: Obtain the suitable operating temperature range for all electrical components in the electrical cabinet by referring to the instruction manuals for the electrical components.

4. The method according to claim 1, characterized in that: The energy-saving test process includes: setting the test temperature to the air conditioner's operating temperature, starting all electrical components inside the electrical cabinet, and acquiring the ambient temperature of all electrical components inside the electrical cabinet in real time to form a corresponding temperature curve; the horizontal axis of the temperature curve represents the detection time, and the vertical axis represents the temperature detection value; the highest point in the temperature curve is taken as the maximum ambient temperature value of the corresponding electrical component.

5. A method according to claim 1, characterized in that: The energy-saving test was set to run for 24 hours.

6. A method according to claim 4, characterized in that: Temperature sensors are installed at the exhaust vents of each electrical component to obtain the real-time maximum ambient temperature of the corresponding electrical component.

7. A method according to claim 2, characterized in that: The maximum value of the common interval of all suitable operating temperature ranges is rounded up, and the minimum value of the common interval is rounded down to determine the air conditioning reference temperature range.

8. A method according to claim 7, characterized in that: The numerical intervals set are 0.1℃.

9. An energy-saving system for an electrical cabinet air conditioner, characterized in that: The system is used to implement the energy-saving method of the cabinet air conditioner as described in any one of claims 1-8.

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