Design of Constant Warm Water Temperature in Water Drinking System

• Main Authors: Shih-Hua Chen, 陳仕樺
• Other Authors: 王金樹
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/es4sjw

碩士 === 國立臺北科技大學 === 製造科技研究所 === 99 === 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.