JP2691272B2 - Carbonated bath water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbonated bath water heater for dissolving carbon dioxide gas in combustion exhaust gas in hot water.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional hot water supply device of this type, which includes a hot water supply pipe 4 for supplying hot water from a hot water supply heat exchanger 2 heated by a hot water supply gas burner 1 to a shower, hot water tap 3, etc. A branch pipe 6 for branching from the hot water supply pipe 4 to supply hot water to the bath 5 is provided, and a steam contact chamber 7 having a packed layer for contacting the exhaust gas of the hot water supply heat exchanger 2 with warm water is provided in the middle of the branch pipe 6. It is a thing.

The role of the air-water contact chamber is to allow heat exchange between the exhaust gas and the warm water to utilize the exhaust heat, and to dissolve the carbon dioxide gas in the exhaust gas in the warm water to function as a carbonated spring in the bath. To have it. Exhaust gas and hot water are brought into contact with each other on the surface of the filling material in the steam contact chamber, when a high temperature exhaust gas and a low temperature water drop are brought into contact with each other in the air, a thin film of water vapor is formed around the water drop. This is because the contact is hindered, and in the above-mentioned conventional example, the reason why the combustion exhaust gas of the gas burner is not directly sent to the steam contact chamber but the heat exchanger for hot water supply is interposed is to lower the temperature of the exhaust gas (up to about 200 ° C.). This is because the solubility of carbon dioxide gas is increased and the troubles caused by the exhaust gas having a high temperature (about 800 ° C.) such as local overheating and boiling of the packed bed are eliminated. Further, unlike the method in which heat is exchanged only in the water / water contact chamber due to the interposition of the heat exchanger for hot water supply, the hot water supplied to the shower or the hot water tap 3 does not pass through the water / water contact chamber 7, so that much There is also an effect that the amount of carbonic acid can be increased.

[0004]

Since the temperature of tap water is higher in the summer (for example, 25 ° C.) than in the winter (for example, 5 ° C.), the burner burns less and the carbon dioxide generated from the burner is reduced. It is unavoidable that the total amount of gas decreases.
However, in the conventional example of FIG. 4, since the difference between the temperature of the tap water and the temperature of the hot water supply becomes small in the summer, the temperature sensor operates and the burner combustion amount decreases, and as a result, the steam contact chamber There is a drawback that the ratio of the amount of exhaust gas supplied to the amount of hot water supplied decreases, and the concentration of carbon dioxide contained in the hot water supply decreases. The present invention aims to solve such problems.

[0005]

A carbonated bath according to the present invention comprises a hot water supply pipe 4 for supplying hot water from a hot water supply heat exchanger 2 for heating tap water by a hot water supply burner 1 to a shower, hot water tap 3 or the like.
And a branch pipe 6 for branching from the hot water supply pipe 4 to supply hot water to the bath tub 5, and supplying tap water to the steam contact chamber 7 for recovering exhaust heat from the exhaust gas of the heat exchanger 2 for hot water supply. The hot water thus obtained is merged into the branch pipe 6.

[0006]

In the present invention, the water supplied to the steam contact chamber 7 is not the hot water from the heat exchanger 2 but the tap water is supplied directly. The temperature becomes lower, the solubility of carbon dioxide becomes higher, and the heat recovery efficiency becomes higher. Further, since the temperature of the hot water obtained in the contact chamber 7 becomes low, it is necessary to raise the hot water temperature in the branch pipe 4 which joins with the hot water, and as a result, the water supplied to the heat exchanger 2 Since the difference between the temperature and the set temperature can be made sufficiently large, the heat output of the gas burner 1 is not throttled during hot water supply, that is, while tap water is being supplied to the contact chamber 7, and therefore the carbon dioxide gas in contact There is no fear that the quantity will decrease.

[0007]

1 is a system diagram of an embodiment of the device of the present invention, in which a hot water supply heat exchanger 2 for heating tap water by a gas burner 1 supplies hot water to a shower, hot water tap 3, etc. Is provided, and a branch pipe 6 for supplying hot water from the hot water supply pipe 4 to the bathtub 5 is branched. On the other hand, heat exchanger 2 for hot water supply
Air-water contact chamber 7 for recovering exhaust heat by contacting the exhaust gas and water of
Is supplied with tap water through the water supply pipe 8, and the hot water obtained here joins the branch pipe 6. Actually, the branch pipe 6 is connected so as to flow from the reheating heat exchanger 9 to the reheating pipe 10 for circulating hot water to the bathtub 5. In the figure, 11 is an exhaust pipe for sending exhaust gas from the hot water supply heat exchanger 2 to the water / water contact chamber 7, and 12 and 13 are solenoid valves installed in the branch pipe 6 and the water supply pipe 7, respectively, for bath heating operation or addition. This is for supplying hot water by opening the valve during hot water operation.

The air / water contact chamber 7 is formed by filling a large number of metal pieces formed, for example, by cutting a stainless pipe into a basket suspended in the exhaust passage.
The water is sprayed from above by the water spray nozzle 15. Since the water flows down along the surface of the metal piece, it takes a long time for the water and the exhaust to contact each other, and the area becomes large, so The carbon dioxide gas in the exhaust gas is easily dissolved in water while the exchange is efficiently performed.

FIG. 2 shows the temperature of the water or hot water supplied to the steam contact chamber and the hot water obtained there when the amount of carbon dioxide gas supply is the same (when hot water is supplied with the burner fully opened). In the graph showing the relationship with the carbonate ion concentration, it can be seen that the curve A represents tap water in winter, B represents summer tap water, and C to D represent hot water supplied from the heat exchanger. It is shown here that the lower the water temperature, the higher the solubility of carbon dioxide gas. Actually, however, the carbonate ion concentration (curve C) of the hot water (around 38 ° C.) supplied from the heat exchanger is shown.
(D) to (d) are 1/2 to 1 / l of the value in this graph because the burner is throttled as described above and the carbon dioxide supply amount is reduced.
It becomes 3. FIG. 3 is a graph showing the relationship between the temperature of water or warm water supplied to the steam contact chamber and the amount of heat recovered by the warm water (42 ° C.) obtained there. The lower the water temperature, the more recovered heat. It is getting bigger.

[0010]

According to the present invention, since tap water is supplied to the steam contact chamber, the temperature of the steam contact chamber becomes lower than that of the conventional method of supplying hot water, and the carbon dioxide In addition to the high gas solubility, the heat recovery efficiency is also improved. Also,
Since the hot water temperature in the branch pipe can be increased by that much, the difference between the temperature of the water supplied to the heat exchanger and the set temperature is sufficiently large (actually, the hot water temperature in the branch pipe is about The temperature of 42 ° C. can be adjusted to 70 to 75 ° C. according to the present invention.) Therefore, even in the summer, while the tap water is supplied to the contact chamber, the heat output of the gas burner is reduced. There is an advantage that the amount of carbon dioxide gas in contact with each other does not decrease.

[Brief description of the drawings]

FIG. 1 is a system diagram of the device of the present invention.

FIG. 2 is a graph comparing the effects of the present invention and the conventional example.

FIG. 3 is another graph comparing the effects of the present invention and the conventional example.

FIG. 4 is a system diagram of a conventional example.

[Explanation of symbols]

 1 Gas Burner 2 Heat Exchanger for Hot Water Supply 3 Hot Water Supply Plug 4 Hot Water Supply Pipe 5 Bathtub 6 Branch Pipe 7 Water-Water Contact Room 8 Water Supply Pipe 9 Reheating Heat Exchanger 10 Reheating Pipe 11 Exhaust Cylinder 12 Solenoid Valve 13 Solenoid Valve 14 Metal Packed bed 15 Sprinkling nozzle

Claims (1)

(57) [Claims] 1. A hot water supply pipe for supplying hot water from a hot water heat exchanger that heats tap water to a shower, a hot water tap, etc., and a branch pipe for branching the hot water supply pipe to supply water to a bathtub. A carbonated bath water heater configured so that tap water is supplied to a steam contact chamber that recovers exhaust heat from the exhaust of a heat exchanger, and the obtained hot water is joined to the distribution pipe.