The assignee for this patent, patent number 8783581, is
Reporters obtained the following quote from the background information supplied by the inventors: "Recreational vehicles, motor homes, trucks, boats and the like, particularly those of the larger variety, often have a plurality of water and coolant circuits. A first circuit may extend from the engine of the vehicle or boat and is typically used for heating the interior or the vehicle or boat. A second circuit may extend from an auxiliary heater which may also be used for heating when the engine is not operating. A third circuit may extend from a source of potable water used for cooking and other personal use. To assist in the significant movement of coolant and potable water, it may be required to use two or more heaters or additional pumps to supply the necessary thermal energy for the heating and also for fluid movement. Of assistance to the flexibility of the system is the distribution module disclosed in our
"For smaller motor coaches and smaller boats, the use of a distribution module and externally located pumps may be unnecessary. In such event, it would be useful to have the burner, the various pumps, the heat exchanger, the expansion tank and the overflow bottle in a single location within a single heater casing. The casing would conveniently be relatively small to take advantage of the reduced space available on a smaller motor coach or a smaller boat.
"Heretofore, the exhaust manifold connected to the burner tube has been designed for operation atop the coolant tank. The heater, being used for both RV and for marine use, conveniently requires an exhaust manifold which will allow an exhaust duct to exit the exhaust manifold in an 'up' configuration for marine installations and a 'down' configuration for RV installations. The exhaust manifold, therefore, was designed to extend beyond the end of the burner tube within the coolant tank so that the exhaust manifold could have either an up or down type exhaust configuration without modifying the coolant tank. This required more space within the coolant tank which was unnecessary and undesirable.
"A further disadvantage with existing systems is that the burner tube is generally located in the center of the coolant tank or at least on the vertical plane defining the center of the coolant tank. The heater heats the coolant fluid unevenly because of the conflicting directions of flow of the heated coolant and there may be zones of coolant at different temperatures within the coolant tank. This affects efficient operation of the heater where precise coolant temperatures and predictable fluid flow are desirable.
"Yet a further disadvantage of existing systems is the use of a pump which is connected directly to the expansion tank which receives coolant from or provides coolant to the coolant tank. A level switch is typically positioned within the coolant tank and when the coolant is low, the level switch terminates operation of the heater. By this time, however, the expansion tank may be empty and the pump thereafter runs dry before terminating operation. Air is introduced into the fluid lines which is not desirable and is inconvenient.
"Combustion burners are used in heaters incorporated in boats, recreational vehicles, trailers and the like as is well known. Some of such heaters use diesel fuel and others use propane or liquefied natural gas. In some applications, such heaters are used to supply heated potable water as well as to supply a heated coolant used for space heating within the vehicle or vessel. The heated potable water is generally heated using a coolant which circulates through a heated coolant tank and exchanges heat with the water by way of a heat exchanger. Such a system is described and illustrated, for example, in our U.S. Pat. No. 7,036,746, the contents of which are incorporated herein by reference.
"Heretofore, the heat exchanger has been located externally of the casing at a location remote from the heater. Such an configuration has a remotely located heat exchanger with a circulation pump to circulate the heated coolant is known. The use of such a configuration is useful where the space sought to be heated is large and where the temperature of the coolant circulated to the radiators is kept at a higher temperature for a longer time period. This is generally the case in larger motorhomes or recreational vehicles and larger marine vessels. The problem with such remotely located heat exchangers and water pumps is that the price increases because of the additional components necessary to utilise such a distribution module.
"In some applications, however, where the space sought to be heated is smaller and where price is an important consideration, it is desirable to incorporate the heat exchanger within the heater casing. In that case, the number of components used can be reduced and the hoses used for circulating the water to the radiators and to the potable water circuit can be kept to a minimum length. Various improvements have been discovered in this configuration which enhances the combination heater and heat exchanger."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventor's summary information for this patent: "According to one aspect of the invention, there is provided a heater system comprising a burner having a burner tube, said burner tube being positioned within said burner tube, said burner tube being positioned within a coolant tank and being adapted to heat the coolant in said tank, an exhaust manifold connected to said burner tube and being adapted to exhaust combustion exhaust from said coolant tank by an exhaust manifold extending outwardly of said coolant tank, said burner tube having a longitudinal axis running generally horizontally, said coolant tank having a longitudinal axis running generally parallel to said longitudinal axis of said burner tube, said longitudinal axis of said burner tube being offset horizontally sidewise a distance from said longitudinal axis of said coolant tank.
"According to a further aspect of the invention, there is provided a heater having a coolant tank operable to contain coolant with a burner tube positioned within said coolant tank, an expansion tank connected to said coolant tank to receive coolant from and to supply coolant to said coolant tank, a pump operably connected to said expansion tank and a level switch to indicate the level of said coolant within said expansion tank and to terminate operation of said heater when said fluid within said expansion tank drops below a predetermined value.
"According to yet a further aspect of the invention, there is provided a heater having a heater casing, a coolant tank, a burner tube within said coolant tank, a pump to pump coolant, an overflow bottle connected to said expansion tank and a heat exchanger to exchange heat between said coolant and potable water, said expansion tank, said coolant tank, said burner tube, said pump and said overflow bottle being positioned within said heater casing.
"According to one aspect of the invention, there is provided a burner assembly located within a coolant tank, said burner assembly having a generally cylindrical configuration and being adapted to fit within a coolant tank recess, an exhaust assembly operable to be mounted within said coolant tank and being connected to said burner assembly such that the combustion products of said burner circulate through said exhaust assembly, said burner assembly and said coolant tank each having generally longitudinal and horizontal axes, said axis of said burner assembly being generally offset to one side of said axis of said coolant tank.
"According to a second aspect of the invention, there is provided an expansion tank for allowing the expansion of coolant fluid used in a coolant heater, said expansion tank being located remotely from said heater and above said heater, a level switch operably mounted on said expansion tank to sense fluid level within said expansion tank, said level switch being operably connected to a coolant pump, said level switch terminating operation of said coolant pump when said fluid level drops below a predetermined level."
For more information, see this patent: Van Ruijven, Edward. Coolant and Potable Water Heater. U.S. Patent Number 8783581, filed
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