Liquid heaters and vaporizers – Stand boiler – Fluid fuel burner
Patent
1991-10-29
1994-11-08
Favors, Edward G.
Liquid heaters and vaporizers
Stand boiler
Fluid fuel burner
122 14, 126361, F22B 500
Patent
active
053617290
DESCRIPTION:
BRIEF SUMMARY
This invention relates to hot water heaters particularly but not exclusively to hot water heaters which can be used in domestic hot water systems.
The first object of the invention is to provide a novel hot water heater which is capable of delivering a relatively large quantity of hot water, the quantity being larger than the total volume of the storage capacity of the heater.
According to a first aspect of the invention there is provided a hot water heater comprising a vessel having an inlet port and an outlet port, a cold water inlet coupled to the inlet port, a hot water outlet line coupled to the outlet port, heating means for heating water in the vessel, and control means for establishing a flow path between the inlet and outlet lines, the arrangement being such that water flowing in said inlet line is divided between the flow path and said inlet port in a predetermined ratio whereby water flowing in the outlet line is, in use, colder than the water passing through the outlet port.
In use the control means is arranged to store hot water in the vessel at a higher temperature than is normally required in the outlet line and the cold water which passes through said flow path reduces the temperature of the water in the outlet line but increases the effective volume of hot water flowing from the heater.
Preferably, the control means comprises a tube of relatively narrow bore. This arrangement has the advantage of simplicity reliability and cheapness. In the arrangement of the invention, the tube does not include a thermostatically controlled valve. It may, however, include a non-thermostatically controlled valve which can be preset, by the manufacturer or by the user, to control the resistance to fluid flow in said path thereby enabling the temperature of the water in the outlet line to be controlled.
Another object of the invention is to provide a gas hot water heater which has a removable panel to provide access to the working components of the heater.
According to a further aspect of the invention there is provided a gas fired hot water heater including a gas burner and a balanced flue, said flue including an air inlet chamber into which air for said burner passes, characterised in that the chamber includes a removable panel which, when removed, affords access to at least said burner. Preferably, the heater includes a thermostatically controlled gas valve and wherein said panel, when removed, affords access to said gas valve.
A further object of the invention is to provide a storage electric hot water heater which can be used in a system having a night rate control, the heater including a number of heating elements which are selectively energised so as to tend to avoid peak loading of the electric supply system when the night rate becomes operative.
According to a further aspect, the invention provides a vessel, first and second heating elements located near the lower end of the vessel and control means for selectively energising the first element, second element, or first and second elements, in accordance with the level of hot water in the vessel.
Preferably the control means includes temperature sensing elements located at spaced locations on the vessel.
According to a further aspect of the invention there is provided a method of controlling an electric hot water heater comprising the steps of sensing the temperature of water in a vessel at selected locations on the vessel and controlling the energisation of first and second elements in accordance with temperatures sensed by said elements, the method being such that one or other or both of the elements are energised.
According to a further aspect of the invention there is provided a method of forming a housing on a body, said method including the step of providing a pair of flanges on opposed edges of a cladding sheet, placing a body in the cladding sheet, applying a clamping force through the opposed flanges to draw them towards one another and utilising fixing means to hold the cladding sheet snugly on the body.
According to a further aspect of the
REFERENCES:
patent: 1802733 (1931-04-01), Murray, Jr.
patent: 1933056 (1933-10-01), Hamilton
patent: 2650575 (1953-09-01), Carlson
patent: 3091223 (1963-05-01), Vitale
Aqua Max Pty Ltd.
Favors Edward G.
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