| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the running cost by suppressing drop of the hot water temperature caused by the heat radiation in a hot water supply conduit in a hot water supply pipe for supplying hot water from a hot water supplier to a hot water-using terminal, and suppressing the frequency of the instantaneous hot water circulating operation in an instantaneous hot water system for circulating warm water in the hot water supply conduit. <P>SOLUTION: A hot water supply pipe 1 includes: a hot water supply conduit 9 for supplying hot water; and a heat insulation conduit 10 which is arranged close to or in contact with the hot water supply conduit 9, and through which warm water for suppressing heat radiation of hot water passing through the hot water supply conduit 9, passes. Since the heat exchange is executed from the hot water supply conduit 9 to warm water in the heat insulation conduit 10, heat radiation losses to the peripheral atmosphere are reduced in the hot water supply conduit 9, and heat insulation property of warm water passing through the hot water supply conduit 9 can be enhanced. Thus, the temperature of hot water staying in the hot water supply conduit 9 is hardly dropped even when hot water has not been used for a certain period, and as a result, the frequency of the instantaneous hot water circulating operation in a hot water supply system 50 using the hot water supply pipe 1 is reduced. <P>COPYRIGHT: (C)2012,JPO&INPIT |
