Liquid heaters and vaporizers – Stand boiler
Patent
1983-01-24
1985-03-12
Yuen, Henry C.
Liquid heaters and vaporizers
Stand boiler
126362, 122 18, F22B 500
Patent
active
045038104
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Technical Field
This invention relates to a water heater of the hot water storage type having a firing section installed outside a hot water storage tank, the water heater being designed to store hot water in large and small amounts, selectively, to make it possible to store hot water in amounts agreeing with the size of demands for hot water.
Description of the Prior Art
A conventional water heater is constructed in the manner shown in FIG. 10. A hot water storage tank 3, having a cold water in feed pipe 1 in the lower region, and a hot water out feed pipe 2 in the upper region, defines a combustion chamber 5 internally in the bottom which is capable of receiving a burner 4 forming the principal element of the heat source, said combustion chamber 5 communicating with a flue and heat exchanger 6 disposed in the middle and extending through the upper end. This water heater is of the natural draft combustion type wherein said flue and heat exchanger 6 has a large diameter and is provided with a baffler 7 to increase thermal efficiency, and an exhaust top 8 at the upper top end. The temperature of hot water in the hot water storage tank 3 is controlled by a temperature thermistor 9 serving to turn on and off the burner 4. Generally, in such a water heater the input to the heat source is low (e.g., 5,000-10,000 Kcal/h) and the hot water storage capacity is high (e.g., 200-400 l). Thus, the operation sequence allowing for the requirement of a long time to heat a predetermined amount of water to a predetermined temperature is such that the gas is ignited sufficiently before the time hot water is actually used in order to store hot water at high temperature (e.g., 80.degree.-85.degree. C.) in large amounts (e.g., 200-400 l). Supplementary heating is automatically effected in response to the lowering of the temperature of the hot water below a predetermined level, so that a large amount of hot water at high temperature will be obtained at any time.
This arrangement is of the type wherein gas is burned under natural draft and water is heated through the flue and heat exchanger 6. Thus, the phenomenon of cold air ascending under the action of draft during storage of hot water at high temperature in large amounts causes the incessant lowering of the temperature of the stored water. That is, the maintenance cost is very high because of high discharge heat loss (generally 400-500 Kcal/h) and the necessity of keeping a large amount of hot water in the storage tank at high temperature even if the demand for hot water is small (which means that hot water not being used loses its heat).
Another drawback is that the low input to the heat source 4 and the large capacity of the hot water storage tank 3 prolong the time required to re-prepare hot water if all the hot water in storage is used up in a short time.
SUMMARY OF INVENTION
The present invention eliminates such drawbacks. Thus, a first object of the invention is to separate from the hot water storage tank the heat source consisting mainly of a burner and a heat exchanger in order to minimize loss of heat through dissipation from the hot water storage tank caused by the action of natural draft.
A second object is to enable a single hot water storage tank to store a large amount (full load) and a small amount (e.g., 40-50 l) depending upon the size of demand for hot water so as to minimize loss of heat through dissipation, thereby minimizing maintenance cost while retaining the advantage of obtaining hot water at high temperature in amounts corresponding to needs.
A third object is to enable a small amount of hot water to be stored by a water heater which has a large water storage capacity, so as to make it possible to obtain in a short time a small amount of high temperature hot water uniform in tapping temperature and to promote convenience for use.
A fourth object is to provide an arrangement for re-heating hot water during tapping as well as for preparing hot water, by means of a single heat source, thereby permitting the lowerin
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Fujishita Kazuo
Kaneko Hideki
Kanno Tadao
Ushirokajitani Yoshiyuki
Matsushita Electric - Industrial Co., Ltd.
Yuen Henry C.
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