| 摘要 |
PURPOSE:To allow the computation of combustion quantity demand as the need arises by providing sensors that detect the feed water temperature, water flow rate and delivered hot water temperature, and performing a feed-forward control and a proportional, integrating control based on the information from the sensors and set temperature determined by users. CONSTITUTION:The feed-forward quantity is defined by (set temperature - feed water temperature) X (water flow rate) X (set temperature - delivered hot water temperature) X alpha...(4), and the combustion quantity demand F is determined by (set temperature - feed water temperature) X (water flow rate) X (set temperature - delivered hot water temperature) Xalpha + (set temperature - delivered hot water temperature) X (water flow rate) X KP + SIGMA(set temperature - delivered hot water temperature) X K1...(5). Therefore, the value of multiplying term for correction of (set temperature - delivered hot water temperature) Xalpha...(6) in the equation (4) or (4') becomes greater because of a greater difference between the set temperature and delivered hot water temperature when the set temperature is raised or the delivered hot water temperature is reduced as the flow rate is increased. As a result, the value of combustion quantity demand F as represented by equation (5) becomes sufficiently great transiently, improving its rise characteristics. Similarly, when the set temperature is lowered or delivered hot water temperature is increased due to a reduced flow rate, the combustion quantity demand is quickly reduced, thereby improving the falling characteristics.
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