飲水機溫水系統恆溫之設計

Design of Constant Warm Water Temperature in Water Drinking System

陳仕樺(Shih-Hua Chen)

指導教授 ： 王金樹

國立臺北科技大學/機電學院/製造科技研究所/碩士(2011年)

摘要

本論文控制恆溫之飲水機溫水系統，藉由實驗及吾人設計之EES模擬軟體驗證；雙向定流量之熱傳實驗的數據發現系統在無控制流量的情形下，Th,out(熱側出口溫度)相當於飲用水之溫水約40℃，系統熱傳反應快速，反應時間約在2~3秒間即達到溫度的平衡，相較於舊設計的子母式溫水系統所產生的飲用水之溫水溫度的控制情形更佳；B (生水(冷))側變化流量之熱傳實驗，可得知此系統的臨界控制流量為13.6L/min，以此做為此系統中的臨界點，在高於臨界點流量之Th,out相當於飲用水之溫水溫度約在45℃以下，故此區為可控區；當流量低於臨界點時，溫度攀升快速，控制上較為不易，故其區域為不可控區；另外可看出B側的質量流率需大於A(熱)側質量流率的2倍以上，Th,out得以進入可控區間內；EES軟體模擬，Th,out的溫度誤差平均約為2.20%，Tc,out(生水(冷)側出口溫度)的溫度誤差約為3.30 %，總體而言兩側的平均誤差約在5%以內。模擬B側2 L/min~20 L/min流量對兩側出口溫度變化指出，B側流量約在14L/min以上所產生的Th,out飲用溫水溫度45℃以下為可控區。
本文中控制流量的裝置，未來能改採電子流量控制閥搭配程式控制達更精準的溫水恆溫控制，同時增加設定記憶模式，記憶消費者適飲之溫水溫度，當作控制流量之依據；概念系統中程控補水裝置之程式設計研究，期能達節能及恆溫之需。

關鍵字

飲水機 ； EES ； 恆溫

並列摘要

The thesis of drinking constant warm water temperature control system, by experiments and EES simulation software validation. The heat transfer experiment of this system in case of uncontrolled flow, Th,out (hot side outlet temperature ) is equivalent to the warm water of about 40 ℃, the system response to rapid heat transfer and the reaction time of about 2 to 3 seconds to reach temperature equilibrium. Compared to the old design system, the design system at uncontrolled flow situation is better; B(cold)side of the change in flow rate of heat transfer experiments, that this system can be critical control flow 13.6L/min, the flow above the critical control flow of Th,out temperature is lower than 45 ℃, this flow area is called controlled areas. When the flow is lower than the critical control flow, the temperature rising quickly and more difficult to control, so this area is not controlled zone. By experiments, B-side mass flow rate must be greater than A (hot) side of more than 2 times. By simulation, Th,out of the average temperature error of about 2.20%. Tc,out ( cold side of the outlet temperature) temperature error of about 3.30%. Overall, the average error on both sides about 5% . Simulated B-side (2 L / min ~ 20 L / min) flow changes. B-side flow 14L/min above, the resulting Th,out temperature is about 45 ℃ following controlled area.
In the future, the use of electronic flow control valve with a program more precise control over the warm water temperature control, while increasing the memory model set to appropriate the memory of consumers drink warm water temperature, as a basis for flow control; the concept of program-controlled water system programming devices to save energy and hope to study the need of constant temperature.

並列關鍵字

Drinking Water System ； EES ； Constant Temperature

參考文獻

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