JP2005337580A - Multifunctional hot water storage type water heater system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multifunctional hot water storage type water heater system having good heat efficiency without making a heating terminal non-usable even in a season as the turn of the year when the temperature of outside air gets lower. <P>SOLUTION: The multifunctional hot water storage type water heater system comprises a heating terminal non-use mode as a heating mode showing a relationship between the measured temperature of low temperature water measured by a water temperature measuring means and the heating temperature of hot water heated by a heating means, having the heating temperature as a first set temperature with the measured temperature being low and the heating temperature as a second set temperature lower than the first set temperature with the measured temperature being high and a heating terminal use mode having the heating temperature as a third set temperature higher than the first set temperature with the measured temperature being low and the heating temperature as a fourth set temperature higher than the second set temperature with the measured temperature being high. The heating terminal non-use mode or the heating terminal use mode can be selected in accordance with a command from a control part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a multifunction hot water storage hot water supply system having a hot water supply terminal supplied with hot water from a hot water storage tank storing hot water and a heating terminal.

  Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2004-36958, hot water is stored in a hot water storage tank, and a hot water storage terminal used for hand washing and the like, and a multifunction hot water storage system using hot water for a heating terminal such as indoor heating A water heater system is used. In this multifunctional hot water storage system, the hot water used at the hot water terminal is 30 to 50 ° C. because it is used directly by humans, whereas the hot water used at the heating terminal is hotter than this. 60-80 ° C. In addition, hot water supply terminals are used throughout the year, whereas heating terminals are used only in winter.

  On the other hand, the higher the temperature of the hot water stored in the hot water storage tank, the greater the temperature difference from the ambient outside air temperature, and the greater the amount of heat dissipated and the lower the thermal efficiency of the system. That is, the lower the temperature of the hot water, the smaller the amount of heat dissipation, and the better the thermal efficiency. However, if the temperature of the hot water is too low, the heating terminal cannot be used. Therefore, it is conceivable that the temperature of the hot water in the hot water storage tank is lowered during the summer when the heating terminal is not used, and the temperature of the hot water is increased during the winter when the heating terminal is used. By doing so, it is possible to improve the thermal efficiency and prevent the heating terminal from becoming unusable.

  From such a viewpoint, Japanese Patent Application Laid-Open No. 2003-287277 discloses a function of changing the temperature of hot water heated by a heating device and supplied to a hot water storage tank according to the situation. Specifically, the hot water heating temperature is set low in the summer when the temperature of the tap water to be heated is low, and the hot water heating temperature is set high in the winter when the temperature of the tap water is low. Is automatically changed according to the season, and a multi-function hot water storage system with high thermal efficiency can be provided.

However, at the turn of the season when the outside air temperature becomes low, the outside air temperature may become sufficiently low before the tap water becomes low temperature. In this case, the heating temperature uses a heating terminal. There were cases where the temperature was lower than possible. As a result, there is a possibility that the heating terminal cannot be used temporarily.
JP 2004-36958 A JP 2003-287277 A

  The present invention has been made in view of such points, and the purpose thereof is that the heating terminal cannot be used even at the turn of the season when the outside air temperature becomes low, In addition, it is an object of the present invention to provide a multifunctional hot water storage type hot water supply system having good thermal efficiency.

  In order to solve the above problems, the multifunction hot water storage system of the present invention shows the relationship between the measured temperature of the low temperature water measured by the water temperature measuring means and the heating temperature of the hot water heated by the heating means. A heating terminal non-use mode in which the heating temperature when the measured temperature is low is the first set temperature, and the heating temperature when the measured temperature is high is the second set temperature that is lower than the first set temperature. A heating terminal use mode in which the heating temperature when the temperature is low is a third setting temperature that is higher than the first setting temperature, and the heating temperature when the measurement temperature is high is a fourth setting temperature that is higher than the second setting temperature; It is possible to switch between the heating terminal non-use mode and the heating terminal use mode according to a command from the control unit.

  In the present invention, the heating terminal non-use mode and the heating terminal use mode can be switched. Therefore, when the user uses the heating terminal at the turn of the season when the outside air temperature changes to a low temperature, the heating mode can be switched to the heating terminal use mode by a command from the control unit. As a result, the temperature of the hot water in the hot water storage tank is low, so that the heating terminal cannot be used. In addition, by setting the heating terminal non-use mode in the summer, the temperature of the hot water in the hot water storage tank can be relatively lowered, heat dissipation can be suppressed, and the thermal efficiency can be increased.

  The configuration of the multifunction hot water storage system of this embodiment will be described with reference to FIG. As shown in FIG. 1, a hot water storage tank 1 of this multifunction hot water storage system has a sealed structure in which a substantially hemispherical top and bottom are provided above and below a cylindrical side surface, and hot water is provided at the top. However, low temperature water is stored in the lower part. Low temperature water is supplied to the lower part of the hot water storage tank 1 through a water supply pipe 2 by water supply means such as water. At this time, the measured temperature which is the temperature of the supplied low temperature water is measured by the temperature sensor 3 which is a water temperature measuring means installed in the water supply pipe 2.

  The low-temperature water supplied to the lower part of the hot water storage tank 1 is moved to the first heat exchanger 7 by the first circulation pump 5 and is heated here to become hot water, and passes through the hot water supply pipe 8 to the upper part of the hot water storage tank 1. Supplied. Further, the heat medium heated by the heating device 4 is circulated by the second circulation pump 6 and moved to the first heat exchanger 7 to heat the low-temperature water. Here, the 1st heat exchanger 7 which is a means to heat low temperature water, and the 1st circulation pump 5 which circulates low temperature water are equivalent to a heating means. In addition, although a heat pump is used as a heating apparatus, a boiler etc. may be sufficient. Moreover, you may heat low temperature water directly with a heating apparatus, without passing through a heat exchanger like this embodiment.

  On the other hand, the hot water stored in the upper part of the hot water storage tank 1 is supplied to the hot water supply terminal A and the heating terminal B. The hot water supply terminal A supplies hot water stored in the upper part of the hot water storage tank 1 to the user through the mixing valve 10 from the water tap 11 as a hand wash for mixed hot water mixed with tap water which is low temperature water. Is. The heating terminal B includes a floor heating 15 and a ceiling heating 16. Here, the heating terminal B uses the hot water supplied from the hot water storage tank by the third circulation pump 12 to heat the floor and the room with the heat medium heated by the second heat exchanger 14. Here, the mixed hot water used in the hot water supply terminal A is 30 to 50 ° C. because it is used directly by humans, whereas the hot water required in the heating terminal B is 60 to 80, which is higher than this. ° C. The hot water supply terminal A is used throughout the year, while the heating terminal B is used only in winter.

  Hereinafter, the operation of the multifunction hot water storage system of the present embodiment will be described. First, in summer, since the outside air temperature is high, the heating terminal B is not used and only the hot water supply terminal A is used. Further, since the temperature of the low-temperature water supplied from the water supply is relatively high, the hot water storage tank is heated by the first heat exchanger 7 to lower the temperature of the hot water supplied to the upper part of the hot water storage tank 1. The heat radiation amount at 1 can be reduced and the thermal efficiency can be increased. That is, in this state, the relationship between the measured temperature and the heating temperature is a heating terminal non-use mode as shown in FIG. Specifically, when the measured temperature of the low-temperature water supplied from the water supply pipe 2 is low (15 ° C. or less), the heating temperature of the hot water by the first heat exchanger 7 is set to 75 ° C., which is the first set temperature, and the temperature is low. When the measured temperature of water is high (25 ° C or higher), the heating temperature of the hot water is set to 65 ° C, which is the second set temperature, and the measured temperature is linearly dependent on the measured temperature in the range of 15 ° C to 25 ° C. The heating temperature changes. In this heating terminal non-use mode, when high-temperature (25 ° C or higher) low-temperature water, which is a normal temperature in summer, is supplied, the heating temperature of the hot water is set to a relatively low temperature of the second set temperature (65 ° C). By doing so, the heat dissipation in the hot water storage tank 1 is reduced to increase the thermal efficiency. In this case, since heat radiation is small, the temperature of the hot water required for the hot water supply terminal B can be maintained even if the heating temperature of the hot water is lowered. On the other hand, when the outside air temperature is temporarily lowered and the measured temperature of the supplied low-temperature water is 25 ° C. or lower, heat is radiated from the hot water storage tank 1 by increasing the heating temperature according to the measured temperature. However, hot water having a temperature required for the hot water supply terminal B can be supplied. However, in the summer, the heating terminal A is not used even if the temperature of the low-temperature water is low. Therefore, the heating temperature of the hot water is set to 75 ° C. at the maximum, so that heat is radiated from the hot water storage tank 1. Is suppressed.

  On the other hand, since the outside air temperature is low in winter, the heating terminal B is also used together with the hot water supply terminal A. Moreover, since the measurement temperature of the low temperature water supplied from a water supply is also comparatively low, by heating with the 1st heat exchanger 7 and raising the heating temperature of the hot water supplied to the upper part of the hot water storage tank 1, Even when the amount of heat radiation in the hot water storage tank 1 is large, hot water having a temperature required for the heating terminal B can be supplied. That is, in this state, the relationship between the measured temperature and the heating temperature is the heating terminal use mode as shown in FIG. Specifically, when the measured temperature of the supplied low-temperature water is low (15 ° C. or lower), the heating temperature of the hot water is set to 90 ° C., which is the third set temperature, and the measured temperature of the low-temperature water is high (25 ° C. or higher). In this case, the heating temperature of the hot water is set to 80 ° C., which is the fourth set temperature, and the heating temperature linearly changes depending on the measurement temperature when the measurement temperature is in the range of 15 ° C. to 25 ° C. That is, the third set temperature is higher than the first set temperature in the heating terminal non-use mode, and the fourth set temperature is higher than the second set temperature in the heating terminal use mode. Here, in this heating terminal non-use mode, when low-temperature water (15 ° C or lower), which is a normal temperature in winter, is supplied, the heating temperature of the hot water is compared with the third set temperature (90 ° C). By setting the target high temperature, even when the amount of heat released from the hot water storage tank 1 is large, hot water having a temperature necessary for the heating terminal B can be supplied.

  Moreover, when the outside air temperature becomes temporarily high and the measured temperature of the supplied low-temperature water becomes 15 ° C. or higher, the heating temperature is lowered according to the measured temperature, so that it is necessary for the heating terminal B. While maintaining the temperature of the hot water, the heat radiation amount in the hot water storage tank 1 is reduced. However, since the heating terminal A is used even in the winter when the measured temperature of the low temperature water is high, the heating temperature of the warm water is at least 80 ° C. and the temperature of the hot water required for the heating terminal B is maintained. Yes.

  As described above, by setting the heating non-use mode in the summer and the heating use mode in the winter, heat radiation is suppressed in consideration of the situation of the terminal used, and the thermal efficiency is increased. Next, the operation when the season changes from summer to winter and the outside air temperature decreases will be described. When the multi-function hot water storage system of this embodiment is used in the heating non-use mode and the outside air temperature is appropriately lowered, the user can use the floor heating 15 or the ceiling heating 16 as the heating terminal B. Turn on the switch. At this time, since the temperature of the hot water stored in the hot water storage tank 1 is only 75 ° C., which is the first set temperature, at the maximum, hot water having a temperature required by the heating terminal B is supplied in this state. It is not possible. Therefore, a warning signal that “the heating terminal B cannot be used” is displayed on the notification unit 18 to warn the user. At the same time, the control unit 17 switches the relationship between the measured temperature and the heating temperature from the heating non-use mode to the heating use mode. By doing so, thereafter, the temperature of the hot water stored in the hot water storage tank 1 becomes sufficiently high so that the heating terminal B can be used. Therefore, when the user turns on the heating terminal B again, the heating terminal B operates and the floor heating 15 and the bathroom heating 16 can be used. Further, when the temperature of the hot water in the hot water storage tank 1 becomes high, an indication from the control unit 17 that “the heating terminal B cannot be used” is deleted from the notification unit 18.

  Furthermore, the operation when the season changes from winter to summer and the outside air temperature rises will be described. In this case, the outside air temperature becomes high and the opportunity to use the heating terminal B decreases. When the heating terminal B is not used for a predetermined period (for example, one week), the control unit 17 changes the heating mode indicating the relationship between the measured temperature and the heating temperature from the heating use mode to the heating nonuse. Switch to mode. By doing so, the hot water supply temperature stored in the hot water storage tank 1 is lowered, and as a result, heat radiation is reduced and the thermal efficiency is increased.

  The multifunction hot water storage system of the present embodiment can switch between the heating terminal non-use mode and the heating terminal use mode, so that the hot water temperature of the hot water storage tank is reduced in summer when the heating terminal is not used. The thermal efficiency can be increased by lowering.

  In addition, since it has a notification unit that issues an alarm signal when the temperature of the hot water supplied from the hot water storage tank is lower than the temperature necessary for operating the heating terminal, the user cannot operate the heating terminal. Can know.

  Further, when the heating mode is set to the heating terminal non-use mode, and the user uses the heating terminal, the heating mode is switched to the heating terminal use mode by a command from the control unit. Even when the outside air temperature is low during the winter season, the heating terminal can no longer be used.

  In addition, when the heating mode is set to the heating terminal use mode and the heating terminal is not used for a predetermined period, the heating mode is changed to the heating terminal non-use mode according to a command from the control unit. Therefore, when the outside air temperature becomes high, such as at the turn of the season from winter to summer, the mode is automatically switched to the heating terminal non-use mode, and the thermal efficiency in summer when the heating terminal is not used can be increased.

It is a block diagram of the multifunctional hot water storage type hot water supply system of this embodiment. It is a graph which shows the relationship between the measurement temperature and heating temperature in heating terminal non-use mode. It is a graph which shows the relationship between the measured temperature in heating terminal use mode, and heating temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 3 Water supply temperature sensor 4 Heating device 5 1st circulation pump 6 2nd circulation pump 7 1st heat exchanger 8 Hot water hot water supply pipe 10 Mixing valve 11 Hot water tap 12 3rd circulation pump 13 4th circulation pump 14 Second heat exchanger 15 Floor heating 16 Ceiling heating 17 Control unit 18 Notification unit A Hot water supply terminal B Heating terminal

Claims (4)

Water supply means for supplying low-temperature water, a hot water storage tank for storing low-temperature water in the lower part and hot water in the upper part, and the low-temperature water supplied from the lower part of the hot water storage tank are heated to return to the upper part of the hot water storage tank. A heating means, a water temperature measuring means for measuring the temperature of the low temperature water, a hot water supply terminal for providing hot water supplied by mixing hot water supplied from the hot water storage tank and low temperature water supplied from the water supply means, and a hot water storage tank A heating terminal that is supplied with hot water and performs heating, and a control unit that adjusts the heating temperature of the hot water heated by the heating means according to the measured temperature of the low temperature water measured by the water temperature measuring means In the multifunction hot water storage system,
As a heating mode showing the relationship between the measurement temperature of the low temperature water measured by the water temperature measuring means and the heating temperature of the hot water heated by the heating means
A heating terminal non-use mode in which the heating temperature when the measured temperature is low is the first set temperature, and the heating temperature when the measured temperature is high is the second set temperature that is lower than the first set temperature;
The heating terminal use mode in which the heating temperature when the measurement temperature is low is the third setting temperature that is higher than the first setting temperature, and the heating temperature when the measurement temperature is high is the fourth setting temperature that is higher than the second setting temperature. And a multi-function hot water storage water heater system that is capable of switching between a heating terminal non-use mode and a heating terminal use mode in accordance with a command from a control unit.   The multifunctional type according to claim 1, further comprising a notification unit that issues an alarm signal when the temperature of the hot water supplied to the heating terminal is equal to or lower than a temperature necessary for operating the heating terminal. Hot water storage water heater system.   When the heating mode is set to the heating terminal non-use mode, and the user uses the heating terminal, the heating mode is switched to the heating terminal use mode according to a command from the control unit. The multi-functional hot water storage system according to claim 1 or 2. When the heating mode is set to the heating terminal use mode and the heating terminal is not used for a predetermined period, the heating mode is switched to the heating terminal non-use mode by a command from the control unit. The multifunctional hot water storage hot water supply system according to any one of claims 1 to 3, wherein

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