초록 ▼

A heat exchanger disposed in the piping of the drain line of a shower bath closet for conducting heat from the spent shower bath water to the water entering the cold water inlet of the shower bath. The heat exchanger has at least two concentric helical coils through which the incoming water flows an

A heat exchanger disposed in the piping of the drain line of a shower bath closet for conducting heat from the spent shower bath water to the water entering the cold water inlet of the shower bath. The heat exchanger has at least two concentric helical coils through which the incoming water flows and over which the spent bath water flows. A central core baffle directs the spent water between the helical coils for good transfer of heat. The spent water preheats the incoming cold water thereby reducing the amount of hot water required from the water heater.

대표청구항 ▼

In a shower bath closet having cold and hot water supply means including a cold water pipe, a spent water drain, and a trap communicating said drain with a sewerage conduit, apparatus for preheating the cold water supplied by the cold water pipe to the water supply means to effect a reduction in the

In a shower bath closet having cold and hot water supply means including a cold water pipe, a spent water drain, and a trap communicating said drain with a sewerage conduit, apparatus for preheating the cold water supplied by the cold water pipe to the water supply means to effect a reduction in the quantity of hot water necessary for a shower bath, said apparatus comprising: a heat exchanger including an elongated substantially cylindrical housing intermediate said drain and said trap, said housing having a spent water inlet at one end connected in flow communication with said drain and a spent water outlet at the opposite end connected in communication with said trap, whereby spent water exiting said drain flows through said heat exchanger prior to entry into said trap, at least one substantially cylindrical continuous helical coil having a central annulus within and extending substantially the length of said housing, said coil being spaced within said housing to define an uninterrupted annular space extending the length of said coil to provide a linear flow path, a core disposed within the central annulus of said coil forming a baffle, said core including means for preventing flow of spent water through said central annulus and for directing the spent water into the uninterrupted annular space for passage of spent water over the surface of the coil and through the uninterrupted annular space, means connecting one end of said coil to said cold water pipe, and means connecting the other end of said coil to said cold water supply means.