近年由於雲端系統與5G新世代通訊技術的發展，計算叢集的建構日益龐大，相對系統的發熱量也大幅提升。因此必須建立冷卻流體分布系統(Coolant Distributed Unit)以滿足整體與局部的散熱要求。本研究建立雙負載之冷卻流體分布系統，期望將雙負載的冷卻流體輸出溫度維持於特定溫度，並減少能量浪費。將冷卻流體分布系統與負載串並聯，架構成熱交換耦合系統，其中熱負載為各負載之熱代謝需求。建立之水冷式冷卻系統之溫度動態系統模型，可用於在滿足雙負載散熱需求前提下，設計控制系統達到節能與溫度調節目標。在雙負載狀況下，本文以水冷式熱交換器系統各別負載閥門開度與工作流體總流量作為系統輸入變數，各分流之流量為輸出變數建構類神經網路水力模型。基於各負載流的出口溫度與分流道流量控制系統總流量及各負載閥門的開度，使各別負載端出口水溫維持 以內，滿足負載端散熱需求，也藉由分流道流量調變整體流量，達到節省能源之目的。

In recent years, due to the development of 5G communication technologies, the construction of computing clusters has increased greatly, and the heat generation of the system has also risen significantly. Therefore, Coolant Distributed Unit (CDU) must be established to meet the overall and local heat dissipation requirements. This research establishes a water-cooled heat exchanger system to reduce the temperature of the double loads to a specific temperature. The CDU is connected in series and parallel with the load to form a high-order heat exchange coupling system, in addition, the load will have differences in heat dissipation requirements according to the current load.
This research discusses the dynamic analysis and temperature control of the water-cooled heat exchanger system. The control system is designed to achieve the goals of energy saving and temperature adjustment. Discuss the influence of different butterfly valve open ratios on the flow field under the condition of double load and carry out the numerical simulation of the flow field under the conditions of constant inlet flow rate and outlet pressure.
Taking the valve open ratio and inlet flow of the water-cooled heat exchanger system as design parameters, multiple sets of heat exchangers with different geometries are generated and simulated, and a neural network model is established based on the numerical simulation results. The input items are the inlet flow rate, the first load valve open ratio (OR1), and the second load valve opening (OR2), and the output items are the inlet pressure difference ( ) between inlet and outlet, the first load flow rate (Q1), and the second load flow rate (Q2).
The water into the load side is adjusted by controlling the valve open ratio. Keep the outlet water temperature at the load side within the range to meet the heat dissipation requirements of the load. The inlet flow rate of the pump is also adjusted by the flow of the branch pipe to save energy.

[1] https://foodprocessinghistory.blogspot.com/2016/11/plate-heat-exchanger.html
[2] R. K. Shah and W. W. Focke, “Plate heat exchanger and their design theory, “ Heat transfer equipment design, edited by R. K. Shah, E.C. Subbarao and R. A. Mashelkar, pp.227-254, Taylor & Francis, 1st Edition, 1988.
[3] Focke, W. W. and Knibbe P. G., 1986, “Flow visualization in parallel- plate ducts with corrugated walls,” Journal of Fluid Mechanics, Vol. 165, pp. 73-77.
[4] Tribbe, C., and Muller- Steinhagen, H. M., 2001, “Gas/liquid flow in plate-and-frame heat exchangers—Part II: two-phase multiplier and flow pattern analysis,” Heat Transfer Engineering, Vol. 22, pp. 12- 21.
[5] Gschwind, P., Gaiser, G., Zimmerer, C. and Kottke, V., 2001, ―Transport phenomena in micro heat exchangers with corrugated walls, Microscale Thermophysical Engineering, Vol. 5, pp. 285- 292.
[6] Lozano, A., Barreras, F., Fueyo, N., and Santodomingo, S., 2008, ―The flow in an oil/water plate heat exchanger for the automotive industry, Applied Thermal Engineering, Vol. 28, pp. 1109- 1117.
[7] Kedzierski, M. A., 1997, ―Effect of inclination on the performance of a compact brazed plate condenser and evaporator, Heat Transfer Engineering, Vol. 18, No. 3, pp. 25-38.
[8] Freund, S., Kabelac, S., 2010, “Investigation of local heat transfer coefficients in plate heat exchangers with temperature oscillation IR thermography and CFD, “ International Journal of Heat and Mass Transfer, Vol. 53, pp. 3764-6781
[9] 王啟川. 熱交換器設計. (五南圖書，民90)