| 摘要 |
<p>PURPOSE:To reduce the loss due to natural heat dissipation and dissolve the concentration of electric power load by a method wherein the necessary quantity of heat is calculated by detecting the temperature of feed water and the quantity and temperature of residual hot water and the necessary quantity of hot water is calculated from said calculated necessary quantity of heat. CONSTITUTION:The respective detected values of a lower temperature sensor 15, an upper temperature sensor 16 and a flow sensor 8 and a value inputted to a setting means for quantity of hot water 19 are inputted as data to a calculating means 20. The calculating means 20 performs the operational process programmed in advance so as to let a pump controlling means 27 to control a pump 13 in order to obtain the proper circulating quantity in response to the calculated result and at the same time to let an energizing controlling means 28 to control a heating device 14 and the starting time and stopping time of the operation of the pump 13. Consequently, the hot water with a certain constant temperature can be supplied at all times and, because no unnecessary hot water is left standing without being used for a long time, the heat loss due to natural heat dissipation is reduced and low maintenance cost can be realized.</p> |
