TWI557391B - Water temperature prediction system, feed-forward system and method thereof for a cooling tower - Google Patents
Water temperature prediction system, feed-forward system and method thereof for a cooling tower Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 236
- 238000000034 method Methods 0.000 title claims description 25
- 238000001816 cooling Methods 0.000 title claims description 20
- 239000000498 cooling water Substances 0.000 claims description 48
- 238000001514 detection method Methods 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 11
- 238000012795 verification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Description
本發明是有關於一種水溫預測系統、前饋控制系統及其方法，且特別是一種使用於冷卻水塔之水溫預測系統、前饋控制系統及其方法。 The invention relates to a water temperature prediction system, a feedforward control system and a method thereof, and in particular to a water temperature prediction system, a feedforward control system and a method thereof for use in a cooling water tower.
冷卻水塔常見於一般化學工業和能源相關等產業，其係用以將冷卻水的廢熱傳遞至空氣，而排出廢熱的冷卻水可再回到製程設備中進行冷卻。習知使用於冷卻水塔的風扇控制模式主要有開關切換、高頻低頻切換和回饋變換等模式。然而，習知冷卻水塔的風扇控制方法，缺乏自動控制機制，大多藉由現場操作人員手動調整，導致無法有效率地調整風扇的運作狀態，而造成冷卻水的溫度過度降低，也因此產生過多的功率消耗。 Cooling towers are common in the general chemical industry and energy-related industries. They are used to transfer the waste heat of cooling water to the air, and the cooling water that discharges the waste heat can be returned to the process equipment for cooling. Conventionally, the fan control modes used in the cooling tower mainly include switching, high frequency low frequency switching, and feedback conversion. However, the conventional fan control method for the cooling tower lacks an automatic control mechanism, and most of them are manually adjusted by the field operator, so that the operation state of the fan cannot be adjusted efficiently, and the temperature of the cooling water is excessively lowered, thereby causing excessive Power consumption.
本發明之一方面是在提供一種使用於冷卻水塔之水溫預測系統、前饋控制系統及其方法，將冷卻水塔的相關數據進行運算，並藉由運算結果控制冷卻水塔中風扇組的運轉，可在冷卻水塔的出口水溫維持在一上限溫度之下 的前提下，減少風扇組過多的功率消耗，進而達成節能的功效。 One aspect of the present invention provides a water temperature prediction system, a feedforward control system, and a method thereof for use in a cooling water tower, and calculates related data of the cooling water tower, and controls the operation of the fan group in the cooling water tower by the operation result. The water temperature at the outlet of the cooling tower can be maintained below an upper limit temperature Under the premise, the power consumption of the fan group is reduced, thereby achieving the effect of energy saving.
根據本發明之上述目的，提出一種適用於冷卻水塔的水溫預測系統，其中此冷卻水塔具有風扇組、至少一入水口及和出水口。水溫預測系統包含出口水溫偵測單元、至少一入口水溫偵測單元、空氣溫度感測單元、空氣濕度感測單元、功率偵測單元和出口水溫預測單元。出口水溫偵測單元設置於出水口，其係用以偵測出水口的出口水溫。此些入口水溫偵測單元分別設置於此些入水口的一入水口，其係用以偵測此些入水口的入口水溫。空氣溫度感測單元設置於該冷卻水塔外，其係用以偵測冷卻水塔外的空氣溫度。空氣濕度感測單元設置於冷卻水塔外，其係用以偵測冷卻水塔外的空氣濕度。功率偵測單元電性連接於該風扇組，其係用以偵測該風扇組產生的耗電功率。出口水溫預測單元電性連接於出口水溫偵測單元、此些入口水溫偵測單元、空氣溫度感測單元、空氣濕度感測單元和功率偵測單元，其係用以根據出口水溫、此些入口水溫、空氣溫度、空氣濕度和耗電功率產生預測出口水溫。 In accordance with the above objects of the present invention, a water temperature prediction system suitable for use in a cooling water tower is provided, wherein the cooling water tower has a fan pack, at least one water inlet, and a water outlet. The water temperature prediction system includes an outlet water temperature detecting unit, at least one inlet water temperature detecting unit, an air temperature sensing unit, an air humidity sensing unit, a power detecting unit, and an outlet water temperature predicting unit. The outlet water temperature detecting unit is disposed at the water outlet, and is used for detecting the outlet water temperature of the water outlet. The inlet water temperature detecting units are respectively disposed at a water inlet of the water inlets for detecting the inlet water temperature of the water inlets. The air temperature sensing unit is disposed outside the cooling water tower for detecting the temperature of the air outside the cooling water tower. The air humidity sensing unit is disposed outside the cooling water tower for detecting the humidity of the air outside the cooling water tower. The power detection unit is electrically connected to the fan group, and is configured to detect power consumption generated by the fan group. The outlet water temperature prediction unit is electrically connected to the outlet water temperature detecting unit, the inlet water temperature detecting unit, the air temperature sensing unit, the air humidity sensing unit and the power detecting unit, and is configured to be based on the outlet water temperature These inlet water temperatures, air temperatures, air humidity, and power consumption produce a predicted outlet water temperature.
根據本發明之上述目的，另提出一種適用於冷卻水塔的前饋控制系統，其中此冷卻水塔具有風扇組、至少一入水口及和出水口。前饋控制系統包含水溫預測系統和風扇調整單元，其中水溫預測系統包含出口水溫偵測單元、至少一入口水溫偵測單元、空氣溫度感測單元、空氣濕度感測單元、功率偵測單元和出口水溫預測單元。出口水溫 偵測單元設置於出水口，其係用以偵測出水口的出口水溫。此些入口水溫偵測單元分別設置於此些入水口的一入水口，其係用以偵測此些入水口的入口水溫。空氣溫度感測單元設置於該冷卻水塔外，其係用以偵測冷卻水塔外的空氣溫度。空氣濕度感測單元設置於冷卻水塔外，其係用以偵測冷卻水塔外的空氣濕度。功率偵測單元電性連接於風扇組，其係用以偵測風扇組產生的耗電功率。出口水溫預測單元電性連接於出口水溫偵測單元、此些入口水溫偵測單元、空氣溫度感測單元、空氣濕度感測單元和功率偵測單元，其係用以根據出口水溫、此些入口水溫、空氣溫度、空氣濕度和耗電功率產生預測出口水溫。風扇調整單元電性連接於風扇組和出口水溫預測單元，其係用以根據預測出口水溫調整風扇組的操作，以控制出口水溫。 In accordance with the above objects of the present invention, a feedforward control system suitable for use in a cooling water tower is provided, wherein the cooling water tower has a fan pack, at least one water inlet, and a water outlet. The feedforward control system includes a water temperature prediction system and a fan adjustment unit, wherein the water temperature prediction system includes an outlet water temperature detecting unit, at least one inlet water temperature detecting unit, an air temperature sensing unit, an air humidity sensing unit, and power detection. Measurement unit and outlet water temperature prediction unit. Export water temperature The detecting unit is arranged at the water outlet, and is used for detecting the outlet water temperature of the water outlet. The inlet water temperature detecting units are respectively disposed at a water inlet of the water inlets for detecting the inlet water temperature of the water inlets. The air temperature sensing unit is disposed outside the cooling water tower for detecting the temperature of the air outside the cooling water tower. The air humidity sensing unit is disposed outside the cooling water tower for detecting the humidity of the air outside the cooling water tower. The power detection unit is electrically connected to the fan group for detecting the power consumption generated by the fan group. The outlet water temperature prediction unit is electrically connected to the outlet water temperature detecting unit, the inlet water temperature detecting unit, the air temperature sensing unit, the air humidity sensing unit and the power detecting unit, and is configured to be based on the outlet water temperature These inlet water temperatures, air temperatures, air humidity, and power consumption produce a predicted outlet water temperature. The fan adjusting unit is electrically connected to the fan group and the outlet water temperature predicting unit, and is configured to adjust the operation of the fan group according to the predicted outlet water temperature to control the outlet water temperature.
根據本發明之上述目的，另提出一種適用於冷卻水塔的前饋控制方法，其中此冷卻水塔具有風扇組、至少一入水口及和出水口。前饋控制方法包含：偵測出水口的出口水溫；偵測每個入水口中的入口水溫；偵測冷卻水塔外的空氣溫度和空氣濕度；偵測風扇組產生的耗電功率；根據下列關係式以得到預測出口水溫：
10‧‧‧冷卻水塔 10‧‧‧Cooling tower
11‧‧‧風扇組 11‧‧‧fan group
12A~12N‧‧‧入水口 12A~12N‧‧‧ Inlet
13‧‧‧出水口 13‧‧‧Water outlet
100‧‧‧前饋控制系統 100‧‧‧Feed-for-feed control system
110‧‧‧出口水溫偵測單元 110‧‧‧Export water temperature detection unit
120A~120N‧‧‧入口水溫偵測單元 120A~120N‧‧‧Inlet water temperature detection unit
130‧‧‧空氣溫度感測單元 130‧‧‧Air temperature sensing unit
140‧‧‧空氣濕度感測單元 140‧‧‧Air humidity sensing unit
150‧‧‧功率偵測單元 150‧‧‧Power detection unit
160‧‧‧出口水溫預測單元 160‧‧‧Export water temperature prediction unit
170‧‧‧風扇調整單元 170‧‧‧Fan adjustment unit
500‧‧‧前饋控制方法 500‧‧‧Feed-forward control method
502、504、506、508、510、512‧‧‧步驟 502, 504, 506, 508, 510, 512 ‧ ‧ steps
P_A~P_N‧‧‧製程設備 P_A~P_N‧‧‧Processing equipment
為讓本發明之上述和其他目的、特徵、優點與實施例能更明顯易懂，所附圖式之說明如下：第1圖係繪示依據本發明一實施例前饋控制系統設置於冷卻水塔之示意圖。 The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Schematic diagram.
第2A圖係繪示本發明實施例之出口水溫和原始出口水溫之示意圖。 2A is a schematic view showing the outlet water temperature and the original outlet water temperature in the embodiment of the present invention.
第2B圖係繪示本發明實施例之耗電功率和原始耗電功率之示意圖。 FIG. 2B is a schematic diagram showing the power consumption and the original power consumption of the embodiment of the present invention.
第3A圖係繪示本發明實施例之出口水溫和原始出口水溫之示意圖。 Fig. 3A is a schematic view showing the outlet water temperature and the original outlet water temperature in the embodiment of the present invention.
第3B圖係繪示本發明實施例之耗電功率和原始耗電功率之示意圖。 FIG. 3B is a schematic diagram showing the power consumption and the original power consumption of the embodiment of the present invention.
第4A圖係繪示本發明實施例進行的驗證所得到的預測出口水溫和調整過的出口水溫之示意圖。 FIG. 4A is a schematic diagram showing the predicted outlet water temperature and the adjusted outlet water temperature obtained by the verification performed by the embodiment of the present invention.
第4B圖係繪示本發明實施例進行的驗證所得到的預測耗電功率和調整過的耗電功率之示意圖。 FIG. 4B is a schematic diagram showing the predicted power consumption and the adjusted power consumption obtained by the verification performed by the embodiment of the present invention.
第5圖係繪示依據本發明一實施例前饋控制方法之流程圖。 FIG. 5 is a flow chart showing a feedforward control method according to an embodiment of the present invention.
以下仔細討論本發明實施例之製造和使用。然而，可以理解的是，實施例提供許多可應用的發明概念，其可 實施於各式各樣的特定內容中。所討論之特定實施例僅供說明，並非用以限定本發明之範圍。 The making and using of the embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable inventive concepts that can be Implemented in a wide variety of specific content. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.
請參照第1圖，第1圖係繪示依據本發明一實施例前饋控制系統100設置於冷卻水塔10之示意圖。冷卻水塔10的作用在於將製程設備P_A~P_N排出的水冷卻，且將冷卻後的水排入至製程設備P_A~P_N以供製程設備P_A~P_N使用。冷卻水塔10包含風扇組11、入水口12A~12N和出水口13。風扇組11包含至少一個變頻風扇，其係用以冷卻經由入水口12A~12N流入冷卻水塔10內的水。入水口12A~12N分別連接於製程設備P_A~P_N的出水端，以將製程設備P_A~P_N排出的水引入至冷卻水塔10內。出水口13連接於製程設備P_A~P_N的入水端，以將冷卻後的水引入至製程設備P_A~P_N中。 Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a feedforward control system 100 disposed in a cooling water tower 10 according to an embodiment of the invention. The function of the cooling water tower 10 is to cool the water discharged from the process equipment P_A~P_N, and discharge the cooled water into the process equipment P_A~P_N for use by the process equipment P_A~P_N. The cooling water tower 10 includes a fan group 11, water inlets 12A to 12N, and a water outlet 13. The fan pack 11 includes at least one inverter fan for cooling water flowing into the cooling tower 10 via the water inlets 12A-12N. The water inlets 12A to 12N are respectively connected to the water outlets of the process equipments P_A to P_N to introduce the water discharged from the process equipment P_A to P_N into the cooling water tower 10. The water outlet 13 is connected to the water inlet end of the process equipment P_A~P_N to introduce the cooled water into the process equipment P_A~P_N.
前饋控制系統100係用以提供控制冷卻水塔10內風扇組11的控制機制，使風扇組10的運作更有效率，進而達到節能的效果。前饋控制系統100包含出口水溫偵測單元110、入口水溫偵測單元120A~120N、空氣溫度感測單元130、空氣濕度感測單元140、功率偵測單元150、出口水溫預測單元160和風扇調整單元170。其中，出口水溫偵測單元110、入口水溫偵測單元120A~120N、空氣溫度感測單元130、空氣濕度感測單元140、功率偵測單元150和出口水溫預測單元160的組合為水溫預測系統，其係用以根據冷卻水塔10的運轉數據計算出對應冷卻水塔10的預測出口水溫。 The feedforward control system 100 is used to provide a control mechanism for controlling the fan group 11 in the cooling water tower 10, so that the operation of the fan group 10 is more efficient, thereby achieving an energy saving effect. The feedforward control system 100 includes an outlet water temperature detecting unit 110, an inlet water temperature detecting unit 120A-120N, an air temperature sensing unit 130, an air humidity sensing unit 140, a power detecting unit 150, and an outlet water temperature predicting unit 160. And a fan adjustment unit 170. The combination of the outlet water temperature detecting unit 110, the inlet water temperature detecting units 120A-120N, the air temperature sensing unit 130, the air humidity sensing unit 140, the power detecting unit 150, and the outlet water temperature predicting unit 160 is water. The temperature prediction system is configured to calculate a predicted outlet water temperature of the corresponding cooling water tower 10 based on the operation data of the cooling water tower 10.
在前饋控制系統10中，出口水溫偵測單元110設置於出水口13，其係用以偵測出水口13的出口水溫T cwout 。入口水溫偵測單元120A~120N分別設置於入水口12A~12N，其係用以偵測入水口12A~12N的入口水溫T 1~T N 。空氣溫度感測單元130和空氣濕度感測單元140設置於冷卻水塔10外，其係分別用以偵測該冷卻水塔10外的空氣溫度T air 和空氣濕度H。功率偵測單元150電性連接於風扇組11，其係用以偵測風扇組11所產生的耗電功率W。此耗電功率W係風扇組11中所有變頻風扇產生的次耗電功率的總和。出口水溫預測單元160電性連接於出口水溫偵測單元110、入口水溫偵測單元120A~120N、空氣溫度感測單元130、空氣濕度感測單元140和功率偵測單元150。出口水溫預測單元160接收出口水溫偵測單元110、入口水溫偵測單元120A~120N、空氣溫度感測單元130、空氣濕度感測單元140和功率偵測單元150分別傳輸的出口水溫T cwout 、入口水溫T 1~T N 、空氣溫度T air 、空氣濕度H和耗電功率W等數據後，藉由下列關係式，計算出預測出口水溫T' cwout ：
其中，a、b、c i 、d、e和f分別為實數係數，其值可根據不同情況做對應調整，例如預測時間點與計算時間點的間隔(即預測出口水溫T' cwout 和出口水溫T cwout 的時間間隔)、冷卻水塔內水槽尺寸或系統穩定時間等。 Where a , b , c i , d , e and f are real coefficients, respectively, and their values can be adjusted according to different situations, such as the interval between the predicted time point and the calculated time point (ie, the predicted outlet water temperature T ' cwout and the exit The time interval of the water temperature T cwout ), the size of the water tank in the cooling tower, or the system stabilization time.
風扇調整單元170電性連接於風扇組11和出口水溫預測單元160。風扇調整單元170用以接收由出口水溫預測單元160計算出的預測出口水溫T' cwout 數據，且利用此數據藉由下列關係式計算出預測耗電功率W'：
其中，T d 為上限出口水溫，且預測耗電功率W'的預測時間點與預測出口水溫T' cwout 的預測時間點相同。風扇組11的調整操作頻率F adj 為預測耗電功率W'的函數。在計算出預測耗電功率W'後，風扇調整單元170將預測耗電功率W'轉換為調整操作頻率F adj ，然後再依據調整操作頻率F adj 控制風扇組11的操作，例如調整風扇組11中每一變頻風扇的開關狀態或轉速，使得在預測出口水溫T' cwout 不超過上限出口水溫T d 的前提下，風扇組11的耗電功率可有效降低。 Where T d is the upper limit outlet water temperature, and the predicted time point of the predicted power consumption power W ' is the same as the predicted time point of the predicted outlet water temperature T ' cwout . The adjustment operating frequency F adj of the fan group 11 is a function of the predicted power consumption W ' . After calculating the predicted power consumption power W ′, the fan adjustment unit 170 converts the predicted power consumption power W ′ into the adjustment operation frequency F adj , and then controls the operation of the fan group 11 according to the adjustment operation frequency F adj , for example, adjusting the fan group 11 . switching state of each frequency or speed of the fan, so that on the premise of the outlet water temperature prediction T 'cwout not exceed the upper limit temperature T d of the outlet, the power consumption of the fan assembly 11 can be effectively reduced.
請參照第2A圖，第2A圖係繪示本發明實施例之出口水溫和原始出口水溫之示意圖。本發明實施例之出口水溫為使用本發明前饋控制系統100所得到的實際出口水溫，且原始出口水溫為未使用本發明前饋控制系統100所得到的出口水溫。在本發明實施例進行的驗證中，上限出口水溫的值設定為33℃。如第2A圖所示，本發明實施例之出口水溫大致高於原始出口水溫，且大致位於上限出口水溫之下。 Please refer to FIG. 2A. FIG. 2A is a schematic diagram showing the outlet water temperature and the original outlet water temperature according to an embodiment of the present invention. The outlet water temperature of the embodiment of the present invention is the actual outlet water temperature obtained by using the feedforward control system 100 of the present invention, and the original outlet water temperature is the outlet water temperature obtained without using the feedforward control system 100 of the present invention. In the verification performed by the embodiment of the present invention, the value of the upper limit outlet water temperature was set to 33 °C. As shown in FIG. 2A, the outlet water temperature of the embodiment of the present invention is substantially higher than the original outlet water temperature and is substantially below the upper limit outlet water temperature.
請同時參照第2B圖，第2B圖係繪示本發明實施例之耗電功率和原始耗電功率之示意圖。如第2B圖所示， 本發明實施例之耗電功率大致在原始耗電功率之下。 Please refer to FIG. 2B at the same time. FIG. 2B is a schematic diagram showing the power consumption and the original power consumption of the embodiment of the present invention. As shown in Figure 2B, The power consumption of the embodiment of the present invention is substantially below the original power consumption.
由第2A和2B圖可知，在符合低於上限出口水溫的前提下，本發明實施例之出口水溫高於原始出口水溫，且較原始出口水溫接近於上限出口水溫，同時本發明實施例之耗電功率W'明顯較原始耗電功率W為小，代表本發明實施例可明顯減少電能消耗。 It can be seen from the figures 2A and 2B that the outlet water temperature of the embodiment of the present invention is higher than the original outlet water temperature, and the original outlet water temperature is close to the upper limit outlet water temperature, while the temperature is lower than the upper limit outlet water temperature. The power consumption power W ' of the embodiment of the invention is significantly smaller than the original power consumption power W , which represents that the power consumption can be significantly reduced in the embodiment of the present invention.
請參照第3A和3B圖，第3A圖係繪示本發明實施例之出口水溫和原始出口水溫之示意圖，且第3B圖係繪示本發明實施例之耗電功率和原始耗電功率之示意圖。第3A和3B圖與第2A和2B圖係在不同月份所進行的驗證結果。如第3A圖所示，本發明實施例之出口水溫大致高於原始出口水溫，且大致位於上限出口水溫之下，且如第3B圖所示，本發明實施例之耗電功率亦大致在原始耗電功率之下。 Please refer to FIG. 3A and FIG. 3B. FIG. 3A is a schematic diagram showing the outlet water temperature and the original outlet water temperature according to the embodiment of the present invention, and FIG. 3B is a diagram showing the power consumption and the original power consumption of the embodiment of the present invention. schematic diagram. Figures 3A and 3B and 2A and 2B are the results of verification performed in different months. As shown in FIG. 3A, the outlet water temperature of the embodiment of the present invention is substantially higher than the original outlet water temperature, and is substantially below the upper limit outlet water temperature, and as shown in FIG. 3B, the power consumption of the embodiment of the present invention is also Roughly below the original power consumption.
依據上述，本發明即使在不同時間點進行驗證，亦可得到相似的結果。透過本發明前饋控制系統100的設定，可在出口水溫不超過上限出口水溫的前提下，有效降低冷卻水塔中風扇組的耗電功率，以減少不必要的功率消耗，進而達成節能的功效。 According to the above, the present invention can obtain similar results even if verification is performed at different time points. Through the setting of the feedforward control system 100 of the present invention, the power consumption of the fan group in the cooling water tower can be effectively reduced under the premise that the outlet water temperature does not exceed the upper limit outlet water temperature, thereby reducing unnecessary power consumption, thereby achieving energy saving. efficacy.
請參照第4A和4B圖，第4A和4B圖係繪示本發明實施例在不同月份進行的驗證所得到的預測出口水溫T' cwout 和實際的出口水溫T cwout 之示意圖。如第4A和4B圖所示，出口水溫T cwout 和預測出口水溫T' cwout 幾乎一致，且預測出口水溫T' cwout 的均方誤差(mean square error；MSE)大約在0.2%附近。由上述可知，使用本發明前饋控制系統100所 計算出的預測出口水溫T' cwout 準確性高。 Please refer to 'a schematic view of FIGS. 4A and 4B of FIG. 4A and 4B illustrate embodiments of the present invention is based prediction outlet water temperature T in Example validation different months of the obtained outlet temperature and the actual cwout cwout of T. As shown in Figures 4A and 4B, the outlet water temperature T cwout and the predicted outlet water temperature T ' cwout are almost identical, and the mean square error (MSE) of the predicted outlet water temperature T ' cwout is approximately 0.2%. From the foregoing, the present invention before using the predicted feedforward control system 100, the outlet water temperature T calculated 'cwout high accuracy.
請參照第5圖，其係繪示依據本發明一實施例前饋控制方法500之流程圖。前饋控制方法500係使用於具風扇組、入水口和出水口的冷卻水塔上。本實施例係以N個入水口和一個出水口的冷卻水塔為例，而在不同實施例中，冷卻水塔的入水口和出水口個數可以是一個或多個。此外，冷卻水塔的風扇組包含至少一個變頻風扇。首先，進行步驟502，偵測出水口的出口水溫T cwout 。接著，進行步驟504，偵測此N個入水口的入口水溫T 1~T N 。步驟504完成後，接著進行步驟506，以偵測冷卻水塔外的空氣溫度T air 和空氣濕度H。之後，進行步驟508，偵測風扇組中所有變頻風扇產生的耗電功率W。此耗電功率W係風扇組中所有變頻風扇產生的次耗電功率的總和。 Please refer to FIG. 5, which is a flow chart of a feedforward control method 500 according to an embodiment of the invention. The feedforward control method 500 is used on a cooling tower having a fan pack, a water inlet, and a water outlet. In this embodiment, a cooling water tower with N water inlets and one water outlet is taken as an example, and in different embodiments, the number of water inlets and water outlets of the cooling water tower may be one or more. In addition, the fan pack of the cooling tower contains at least one inverter fan. First, step 502 is performed to detect the outlet water temperature T cwout of the nozzle . Next, step 504 is performed to detect the inlet water temperatures T 1 ~ T N of the N water inlets. After step 504 is completed, step 506 is followed to detect the air temperature T air and the air humidity H outside the cooling tower. Then, step 508 is performed to detect the power consumption W generated by all the inverter fans in the fan group. Times the sum of power consumption of the power consumption W of this group, all the fan system frequency generated by the fan.
藉由進行步驟502至步驟508，以取得出口水溫T cwout 、入口水溫T 1~T N 、空氣溫度T air 、空氣濕度H和耗電功率W等冷卻水塔相關數據。接著，進行步驟510，藉由式(1)以得到預測出口水溫T' cwout 。 By performing steps 502 to 508, cooling tower related data such as the outlet water temperature T cwout , the inlet water temperature T 1 to T N , the air temperature T air , the air humidity H, and the power consumption W are obtained. Next, step 510 is performed to obtain the predicted outlet water temperature T ' cwout by the formula (1).
接著，進行步驟512，根據在步驟510中得到的預測出口水溫T' cwout 調整風扇組的操作，以控制冷卻水塔的出口水溫。詳細而言，在步驟512中，首先設定冷卻水塔的上限出口水溫T d ，接著藉由式(2)計算出預測耗電功率W'。在式(2)中，預測耗電功率W'的預測時間點與預測出口水溫T' cwout 的預測時間點相同。風扇組的調整操作頻率F adj 為預測耗電功率W'的函數。因此，在計算出預測耗電功率W'後， 利用調整操作頻率F adj 和預測耗電功率W'的函數關係，將預測耗電功率W'轉換為調整操作頻率F adj ，然後再依據調整操作頻率F adj 控制風扇組的操作，例如調整風扇組中每一變頻風扇的開關狀態或轉速。 Next, in step 512, the prediction of the outlet water temperature T obtained in step 510 'cwout adjust the operation of the fan groups to control the outlet temperature of the cooling towers. Specifically, in step 512, first sets the upper limit of the cooling tower outlet water temperature T d, is then calculated by the formula (2) the predicted power consumption W '. In the formula (2), the predicted power consumption W 'predicted time point and the prediction of the outlet temperature T' of the same cwout predicted time point. The adjustment operating frequency F adj of the fan group is a function of the predicted power consumption W ′. Therefore, after calculating the predicted power consumption power W ′, the predicted power consumption power W ′ is converted into the adjustment operation frequency F adj by using the function relationship between the adjustment operation frequency F adj and the predicted power consumption power W ′, and then according to the adjustment operation. The frequency F adj controls the operation of the fan group, for example, adjusting the switching state or the rotational speed of each inverter fan in the fan group.
藉由進行本發明的前饋控制方法500，可使冷卻水塔在預測出口水溫T' cwout 不超過上限出口水溫T d 的前提下，有效降低風扇組的耗電功率，減少風扇組過度運轉所產生的額外功率消耗，進而達成節能的功效。此外，前饋控制方法500亦提供操作的便利性，使用者只需要設定上限出口水溫T d ，便可自動控制風扇組以最有效率的方式運作。 Feedforward control method of the present invention is performed by 500, can predict the cooling tower outlet water in the premise T 'cwout not exceed the upper limit temperature T d of the outlet to effectively reduce power consumption of the fan assembly, the fan assembly to reduce overrunning The extra power consumption generated, in turn, achieves energy savings. In addition, feed forward control 500 also provides a convenient method of operation, the user only needs to set the upper limit of the outlet water temperature T d, the control will automatically set the fan operating in the most efficient manner.
應注意的是，式(1)中係數a、b、c i 、d、e和f的值可根據不同情況做對應調整，例如預測出口水溫T' cwout 和出口水溫T cwout 的時間間隔、冷卻水塔內水槽尺寸或系統穩定時間等。此外，在其他實施例中，步驟502可改變為偵測冷卻水塔中水槽內的水溫。 It should be noted that the values of the coefficients a , b , c i , d , e and f in the formula (1) can be adjusted according to different situations, for example, the time interval between the predicted outlet water temperature T ' cwout and the outlet water temperature T cwout is predicted . , the size of the water tank in the cooling tower or the system stabilization time. Moreover, in other embodiments, step 502 can be changed to detect the temperature of the water in the sink in the cooling tower.
雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.
10‧‧‧冷卻水塔 10‧‧‧Cooling tower
11‧‧‧風扇組 11‧‧‧fan group
12A~12N‧‧‧入水口 12A~12N‧‧‧ Inlet
13‧‧‧出水口 13‧‧‧Water outlet
100‧‧‧前饋控制系統 100‧‧‧Feed-for-feed control system
110‧‧‧出口水溫偵測單元 110‧‧‧Export water temperature detection unit
120A~120N‧‧‧入口水溫偵測單元 120A~120N‧‧‧Inlet water temperature detection unit
130‧‧‧空氣溫度感測單元 130‧‧‧Air temperature sensing unit
140‧‧‧空氣濕度感測單元 140‧‧‧Air humidity sensing unit
150‧‧‧功率偵測單元 150‧‧‧Power detection unit
160‧‧‧出口水溫預測單元 160‧‧‧Export water temperature prediction unit
170‧‧‧風扇調整單元 170‧‧‧Fan adjustment unit
P_A~P_N‧‧‧製程設備 P_A~P_N‧‧‧Processing equipment
Claims (9)
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| TW103101832A TWI557391B (en) | 2014-01-17 | 2014-01-17 | Water temperature prediction system, feed-forward system and method thereof for a cooling tower |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201003930Y (en) * | 2006-08-31 | 2008-01-09 | 王吉一 | Cooling water tower |
| US20090200000A1 (en) * | 2006-04-14 | 2009-08-13 | Kammerzell Larry L | Cooling tower |
| TWM397498U (en) * | 2010-08-27 | 2011-02-01 | Heng Kang Technology Co Ltd | Energy saving control system for air conditioning equipment |
| JP5363139B2 (en) * | 2009-02-25 | 2013-12-11 | アズビル株式会社 | Cooling tower fan control apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090200000A1 (en) * | 2006-04-14 | 2009-08-13 | Kammerzell Larry L | Cooling tower |
| CN201003930Y (en) * | 2006-08-31 | 2008-01-09 | 王吉一 | Cooling water tower |
| JP5363139B2 (en) * | 2009-02-25 | 2013-12-11 | アズビル株式会社 | Cooling tower fan control apparatus and method |
| TWM397498U (en) * | 2010-08-27 | 2011-02-01 | Heng Kang Technology Co Ltd | Energy saving control system for air conditioning equipment |
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