US 5,351,712 A · Hot water recovery system

Abstract

An on demand, remotely activated, electronically and electro-mechanically controlled, energy saving, water conservation, hot, water recovery system, which may be installed in residential and commercial structures having a pressurized water supply (11). The system is comprised of a dual chamber, dual hot water outlet, water heating reservoir (23), and a flow control and recovery apparatus (10), in fluid communication with a cold water supply (11) and hot water outlets (93-97). The system installs in new or existing structures, without alteration of the plumbing lines or electrical wiring. The flow control (84) is preprogrammed to, upon command, drain standing water from the hot water outlets (93-97), and refill the outlets with hot water from the small chamber (23b) of the water heating reservoir (23), making hot water available at the instant an outlet is opened. During hot water use, the system delivers hot water to the hot water outlets (93-97) from the large chamber (23a), of the water heating reservoir (23). Discontinuance of hot water use, for a time, causes the flow control (84) to configure the recovery apparatus (10) to return hot water in the hot water outlets, before it cools, to the small chamber (23b). The recovery apparatus (10) refills the empty hot water outlets with cold water, then resets to the ready condition. The system may be configured for use with any conventional water heater.

In a plumbing system which has a pressurized cold water supply, having a cold water supply conduit for the purpose of coupling the cold water supply to a cold water inlet of a water heating reservoir and having a hot water supply conduit for the purpose of coupling the hot water outlet of said water heating reservoir, to a plurality of hot water outlets, a hot water recovery system, remotely controlled, which installs in existing structures without requiring the installation of additional plumbing lines, and for supplying hot water on command and for, upon completion of use, automatically and rapidly returning unused hot water from the hot water outlets, to the water heating reservoir, comprising in combination:

(a) a flow control and recovery apparatus;
(b) a dual chamber, dual hot water outlet, water heating reservoir;
(c) said flow control and recovery apparatus and said dual chamber, dual hot water outlet water heating reservoir, in fluid communication and being interposed between said cold water supply conduit and said hot water supply conduit;
(d) a power source;
(e) a vent, relief nipple;
(f) a vent relief flow device;
(g) a pump means, for pumping water into and out of the recovery system and the plumbing system;
(h) a power control means, remotely actuated, for the purpose of supplying, on command, power to the hot water recovery system;
(i) a remote control means to transmit a command to said power control means;
(j) a flow control means for actuating and deactuating, at the proper times and in the proper sequences, remotely actuated valve means, which control flow, individually and in combinations, and for actuating and deactuating said pump means;
(k) a remotely actuated valve means and the conduit means for the purpose of permitting the interruption of the cold water supply to the plumbing system, and the water heating reservoir;
(l) a cold water holding tank to capture cold water evacuated from said hot water outlets;
(m) a remotely actuated valve means and the conduit means to couple the hot water outlets to the inlet side of said pump means and a second remotely actuated valve means and the conduit means coupled between the outlet side of said pump means and said cold water holding tank, acting in combination with the actuated pump means to evacuate standing cold water from said hot water outlets, to said holding tank;
(n) a large chamber within said dual chamber, dual hot water outlet, water heating reservoir, having a cold water inlet in fluid communication with said flow control and recovery apparatus and the conduit means, which is coupled to said pressurized cold water supply, and with a hot water outlet which is in fluid communication with said flow control and recovery apparatus and the conduit means, in fluid communication with said hot water outlets;
(o) a small chamber, located within said large chamber of said dual chamber, dual hot water outlet, water heating reservoir, with a dual purpose fitting functioning as an inlet to and outlet from, said small chamber;
(p) said vent relief nipple coupled to said dual purpose, inlet outlet of said small chamber, in fluid communication with said flow control and recovery apparatus, which permits the bi-directional transfer of hot water between said hot water outlets, and said small chamber, said vent relief nipple being constructed with a fluid passage and a separate air passage;
(q) a vent relief means coupled to said vent relief nipple, to permit the ingress and egress of air in to and out of said small chamber of said water heating reservoir during the filling and draining sequences of said small chamber;
(r) a remotely actuated valve means and conduit means to connect the vent relief nipple coupled to said dual purpose, inlet outlet of said small chamber, to the inlet side of said pump means and a second remotely actuated valve means and the conduit means coupled between the outlet side of said pump means and the hot water outlets, acting in combination with the actuated said pump means, to fill evacuated hot water outlets with hot water from said small chamber;
(s) a remotely actuated valve means and conduit means to couple the hot, water outlets to the inlet side of said pump means and a remotely actuated valve means and the conduit means, coupled between the outlet side of said pump means and the vent relief nipple coupled to said small chamber acting in combination with the actuated pump means, to permit the return of hot water from said hot water outlets to said small chamber;
(t) a remotely actuated valve means and conduit means which couples the cold water supply, through the recovery apparatus, to the cold water inlet of said large chamber of said dual chamber, dual hot water outlet heating reservoir and the conduit means coupling the hot water outlet of said large chamber to the recovery apparatus, in fluid communication with said hot water outlets, to permit hot water to be directed to any of the hot water outlets which may be opened;
(u) a remotely actuated valve means and the conduit means to couple the cold water supply to the evacuated hot water outlets, for the purpose of refilling the outlets with fresh cold water;
(v) a check valve to prevent hot water from back flowing into said cold water supply;
(w) a flow switch means in fluid communication with the hot water outlet of the large chamber of the water heating reservoir and the hot water outlet conduit, to control power to the said flow control means, during the hot water use sequence;
(x) a venturi means coupled between said cold water holding tank and the cold water supply conduit of the large chamber to drain captured cold water, from said cold water holding tank, into the large chamber;
(y) a float switch means incorporated into said cold water holding tank which interrupts power, in the event of tank overfill;
(z) a vent-relief means incorporated in said cold water holding tank, which permits the ingress and egress of air to and from said cold water holding tank;
(aa) a vent-relief flow device coupled to the upstream side of each hot water outlet, which permits the ingress and egress of air, and permits water flow to the attached outlet.

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Hot water recovery system

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Hot water recovery system

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Abstract

Claims10