JP3931894B2 - Water heater - Google Patents

Description

The present invention relates to a hot water storage type water heater having a bath retreat function.

Conventionally, as this type of water heater, there is one having a reheating function of a bathtub using hot water of a hot water tank (see, for example, Patent Document 1).

FIG. 2 shows a conventional water heater described in Patent Document 1. As shown in FIG. As shown in the figure, this hot water supply machine includes a compressor 1, a heat pump unit 4 including a hot water supply heat exchanger 2 and an evaporator 3 which are refrigerant to water heat exchangers, a hot water tank 5 and water to water heat. The hot water supply unit 7 includes a bath heat exchanger 6 that is an exchanger. The hot water storage tank 5 stores hot water heated by the heat pump unit 4 using the hot water supply heat exchanger 2. The bath heat exchanger 6 heats the hot water in the bathtub 8 by circulating the hot water in the hot water tank 5. That is, hot water pumped from the heat source side circulation pump 9 from the upper part of the hot water tank 5 is led to the bath heat exchanger 6 to heat the hot water or water in the bathtub 8 pumped from the use side circulation pump 10. After that, the hot water tank 5 is returned to. Further, the hot water in the hot water tank 5 is poured into the bathtub 8 through the bathtub pouring pipe 11, and the hot water can be supplied by opening the faucet 12.
JP 2002-243275 A

However, the conventional configuration has the following problems. Since the hot water supply load is generally concentrated from evening to night, the amount of hot water remaining in the hot water tank 5 is the smallest during this time period. The amount of hot water remaining in the hot water tank 5 is extremely reduced especially when hot water is poured into the bathtub 8 for hot water filling, and before and after that, hot water supply load in the kitchen or shower in the bath continues. There is a case. Under such circumstances, when the request for reheating the bath overlaps, the hot water in the upper part of the hot water tank 5 is used, so that hot water having a predetermined hot water temperature does not come out of the tap 12 during hot water supply. Hot water runs out. Moreover, depending on the case, there was a problem that the bath reheating itself could not be performed, or the bath reheating ability was extremely lowered, and the temperature of the bathtub 8 did not easily increase.

  The present invention solves the above-mentioned problem. When the amount of remaining hot water in the hot water storage tank 5 decreases, the heating capacity of the bath is reduced, the possibility of running out of hot water is reduced, and the bath cannot be reheated. The object is to provide a water heater that is reduced in comfort and convenience.

In order to solve the conventional problems, a water heater of the present invention includes a hot water heating means, a hot water storage tank for storing hot water heated by the hot water heating means, a hot water on the heat source side circulated from the hot water storage tank, and a bathtub. A bath heat exchanger that exchanges heat with water or hot water on the use side to be circulated, heat source side circulation means that circulates hot water stored in the hot water storage tank to the bath heat exchanger, and water or hot water from the bathtub Use side circulation means for circulating to the bath heat exchanger, heat source side outlet temperature detection means for detecting the heat source side outlet temperature of the bath heat exchanger, and use side inlet for detecting the use side inlet temperature of the bath heat exchanger A temperature detecting means; a remaining hot water amount detecting means for detecting a remaining hot water amount in the hot water storage tank; and a control means for controlling the operation of the heat source side circulating means and the use side circulating means. The amount of remaining hot water is a predetermined value The temperature between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detection means and the usage side inlet temperature of the bath heat exchanger detected by the usage side inlet temperature detection means is higher than when it is low. The number of rotations of the heat source side circulation means is controlled so that the difference becomes small .

  As a result, when the amount of hot water remaining in the hot water tank decreases, the heating capacity of the bath is reduced to reduce the amount of hot water used, thereby reducing the possibility of running out of hot water and preventing the bath from being reheated. Can be reduced.

  The water heater of the present invention reduces the possibility of running out of hot water by reducing the amount of hot water used by reducing the heating capacity of the bath when the amount of hot water remaining in the hot water storage tank is small, and further replenishing the bath. It is possible to improve comfort and convenience by reducing the state in which the user cannot perform the whispering operation.

The present invention can be carried out in the form described in each claim, and the first invention is a hot water supply heating means, a hot water storage tank for storing hot water heated by the hot water supply heating means, and a heat source circulated from the hot water storage tank. A bath heat exchanger for exchanging heat between the hot water on the side and the water on the use side or hot water circulated from the bathtub, heat source side circulation means for circulating the hot water stored in the hot water storage tank to the bath heat exchanger, and the bathtub The use side circulation means for circulating water or hot water from the bath heat exchanger to the bath heat exchanger, the heat source side outlet temperature detection means for detecting the heat source side outlet temperature of the bath heat exchanger, and the use side inlet temperature of the bath heat exchanger Use side inlet temperature detection means for detecting the amount of remaining hot water in the hot water storage tank, control means for controlling the operation of the heat source side circulation means and the use side circulation means, Detected by hot water detection means When the amount of hot water is less than a predetermined value, the heat source side outlet temperature detection means detects the heat source side outlet temperature detected by the heat source side outlet temperature detection means and the use side inlet temperature detection means detects the bath heat exchanger use side. The number of rotations of the heat source side circulation means is controlled so that the temperature difference from the inlet temperature is small. When the remaining amount of hot water in the hot water tank decreases, the heating capacity of the bath is reduced to reduce the hot water capacity. Since the amount of water used is reduced, the possibility of running out of hot water is reduced, and the state in which the bath cannot be reheated is reduced, thereby improving comfort and convenience.

Moreover, since the hot water temperature which returns to a hot water tank after exchanging heat with a bath heat exchanger can be made into a predetermined temperature range, the efficiency at the time of reboiling the hot water which returned to the hot water tank can be made high.

In addition, the heat source side outlet temperature of the bath heat exchanger can be adjusted according to the temperature of the bathtub,
Hot water can be used effectively, and the efficiency at the time of reboiling the hot water returned to the hot water tank can be increased.

Further, since the amount of hot water used in the hot water tank is reduced, the possibility of running out of hot water is reduced, and the state in which the bath cannot be reheated can be reduced.

In the second invention, in particular, the remaining hot water amount detecting means of the first invention is a plurality of remaining hot water temperature detecting means for detecting the temperature of the hot water storage tank provided in the hot water storage tank. To secure the hot water temperature or amount necessary for bathing, and to control the heating capacity of the bath, reduce the possibility of running out of hot water, and reduce the state where bath bathing cannot be performed. Can do.

In the third invention, by controlling the rotation speed of the heat source side circulation means so as to lower the heat source side outlet temperature of the bath heat exchanger, the hot water in the hot water tank can be used effectively and returned to the hot water tank. Efficiency when re-boiling hot water can be increased.

In the fourth invention, the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. As described above, the amount of remaining hot water for controlling the rotation speed of the heat source side circulation means is set as a first predetermined remaining hot water amount, and a second predetermined remaining hot water amount set to an amount larger than the first predetermined remaining hot water amount is provided. and, when the remaining hot water is less than the second predetermined remaining hot water by performing the hot-water supply heating operation to raise boiling the hot water storage tank, since to secure the amount of hot water required for reheating of conventional hot-water supply load and the bath, The possibility of running out of hot water is reduced, and the state in which the bath cannot be rerun is reduced.

In the fifth invention, the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. As described above, the amount of remaining hot water for controlling the rotation speed of the heat source side circulation means is set as a first predetermined remaining hot water amount, and a third predetermined remaining hot water amount set to an amount smaller than the first predetermined remaining hot water amount is provided. and, when the remaining hot water is less than the third predetermined remaining hot water, by so as to stop the heat-source-side circulating means, it is possible to secure a hot water corresponding to the minimum hot water supply load, the hot water The possibility of cutting can be reduced.

According to a sixth aspect of the present invention, when the heat source side inlet temperature of the bath heat exchanger is not higher than the temperature of the bathtub by a predetermined temperature difference or more, the heat source side circulation means is stopped so that the wasteful bath reheating operation is performed. Can be prevented.

In the seventh aspect of the present invention, when the heat source side circulation means is stopped, the user can be notified that the amount of remaining hot water has decreased by providing an alarm device for notifying the fact, so that it is possible to cope with hot water shortage. , Can improve convenience.

In addition to the above-described configuration, the eighth invention achieves high-performance energy saving by using a hot water supply heating means as a heat pump cycle.

In the ninth aspect of the invention, since the refrigerant sealed in the heat pump cycle is carbon dioxide, high temperature and high efficiency can be achieved and the global environment can be protected.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a water heater in the first embodiment of the present invention. In FIG. 1, hot water heating means 13 that is a heat source of a hot water heater is a heat pump heat source that constitutes a heat pump cycle including a compressor 1, a hot water supply heat exchanger 2, a decompression device 14, and an evaporator 3 that absorbs atmospheric heat. Then, carbon dioxide whose refrigerant pressure on the high pressure side is equal to or higher than the critical pressure is used as the refrigerant. Water supply to the hot water tank 5 is made through a water supply pipe 15 connected to the lower part of the hot water tank 5, and hot water at the upper part of the hot water tank 5 passes through the hot water discharge pipe 16 and is mixed with the water supply by a mixing valve 17 to a predetermined temperature. Then, hot water is supplied from the terminal (faucet 12) through the hot water supply pipe 18. In addition, by forming a boiling circuit that sequentially connects the lower part of the hot water tank 5 to the circulation pump 19, the hot water supply heat exchanger 2, and the upper part of the hot water tank 5, the water sent from the hot water tank 5 by the circulation pump 19 is Hot water is stored in the hot water storage tank 5 by being heated by the refrigerant heat in the hot water supply heat exchanger 2. A boiling temperature detecting means 20 is provided at the water-side outlet of the hot water supply heat exchanger 2 in order to detect the hot water temperature heated by the heat pump heat source.

  The bath heating means 21 includes a bath heat exchanger 6 that is a water / water heat exchanger, a heat source side and a use side water circuit connected thereto, and a heat source side circulation pump 9 and a use side circulation respectively provided in the water circuits. It consists of a pump 10 and the like. Heating of the bathtub 8 is sent from the hot water tank 5 to the bath heat exchanger 6 by the heat source side circulation pump 9 and from the bathtub 8 to the bath heat exchanger 6 by the use side circulation pump 10. This is done by exchanging heat with warm water or hot water. Reference numerals 22, 23, and 24 denote first, second, and third remaining hot water temperature detecting means attached at different positions in the vertical direction of the hot water tank 5. Furthermore, the control means 25 controls the heating capacity in the bath heating means 21.

  About the hot water heater comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. In FIG. 1, first, the hot water supply heating operation will be described. If there is a request (not shown) for boiling the hot water storage tank 5, a hot water supply heating operation using atmospheric heat is performed with a heat pump heat source. In this case, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is heated to a hot water supply heat exchanger 2 where heat is exchanged with the water sent from the lower part of the hot water tank 5 to dissipate the heat. The pressure is reduced by the apparatus 14, and heat is absorbed from the atmosphere by the evaporator 3, gasified, and returned to the compressor 1. At this time, the number of revolutions of the circulation pump 19 is controlled so that the outlet water temperature of the hot water supply heat exchanger 2 becomes a predetermined temperature with the high-temperature refrigerant flowing into the hot water supply heat exchanger 2, and hot water of a predetermined temperature is It flows in from and is stored.

  Next, normal bath heating operation (when there is sufficient remaining hot water) will be described. Now, when there is a bath heating request (not shown), the control means 25 drives the use side circulation pump 10 and the heat source side circulation pump 9. And the water sent from the bathtub 8 by the use side circulation pump 10 is heated by exchanging heat with the hot water in the upper part of the hot water tank 5 sent by the heat source side circulation pump 9 in the bath heat exchanger 6. Return to bathtub 8.

  At this time, if the heat source side inlet water temperature of the bath heat exchanger 6, that is, the temperature of the upper part of the hot water storage tank 5 is the same, generally, the larger the flow rate of the heat source side circulation pump 9, the larger the heating capacity of the bath. The temperature of the hot water that radiates heat in the heat exchanger 6 and returns to the lower part of the hot water tank 5 is also high. On the other hand, the smaller the flow rate of the heat source side circulation pump 9, the smaller the heating capacity of the bath, and the lower the temperature of hot water that radiates heat in the bath heat exchanger 6 and returns to the lower part of the hot water tank 5.

On the other hand, if the flow rate of the heat source side circulation pump 9 is the same, generally, the temperature of the upper part of the hot water tank 5 is higher, that is, the heat source side inlet water temperature of the bath heat exchanger 6 is higher. The capacity of the hot water that is radiated by the bath heat exchanger 6 and returned to the lower part of the hot water tank 5 is high. On the contrary, when the temperature of the upper part of the hot water tank 5 is low, that is, when the temperature of the heat source side inlet water of the bath heat exchanger 6 is lower, the heating capacity of the bath is smaller. The temperature of the hot water that goes back to the bottom is also low. The hot water returned to the lower part of the hot water tank 5 is heated to a predetermined temperature by the hot water heating operation described above as needed and stored in the upper part of the hot water tank 5. The operating efficiency during this hot water heating operation is as follows:
As the inlet water temperature of the water, that is, the temperature of the lower part of the hot water storage tank 5 increases, the temperature becomes worse.

  Thus, the capacity of the bath heating is not necessarily large, and the hot water at the upper part of the hot water tank 5 is radiated by the bath heat exchanger 6 and then returns to the lower part of the hot water tank 5, but the return temperature is It affects the performance of the subsequent hot water heating operation. Further, if the temperature returning to the hot water tank 5 is high, not only the efficiency of the subsequent hot water heating operation is deteriorated, but also the thermal energy possessed by the hot water is not sufficiently used. On the other hand, if the temperature returning to the hot water tank 5 is too low, the bath heating capacity will be insufficient, and the temperature of the bathtub 8 will not rise easily.

  Therefore, as shown in FIG. 1, a heat source side outlet temperature detecting means 26 for detecting the heat source side outlet temperature of the bath heat exchanger 6 and a use side inlet temperature detecting means 27 for detecting the use side inlet temperature of the bath heat exchanger 6; And the flow rate of the hot water on the heat source side is controlled by the temperature difference between the two. For example, if the temperature difference ΔT = 5 (K) is controlled to be constant, the return temperature to the hot water tank 5 can be made relatively low even if the temperature of the bathtub 8 changes, and the bath heating capability Can also be made relatively large. That is, the control means 25 detects the heat source side outlet temperature and the use side inlet temperature of the bath heat exchanger 6 obtained from the heat source side outlet temperature detection means 26 and the use side inlet temperature detection means 27, and the temperature of both of them. The rotational speed of the heat source side circulation pump 9 is controlled so that the difference becomes 5K.

  Next, the bath heating operation when there is little remaining hot water will be described. As described above, the first remaining hot water temperature detecting means 22 is provided on the surface of the hot water tank 5. The position where the first remaining hot water temperature detecting means 22 is provided is set in consideration of running out of hot water from the hot water supply load immediately after pouring the bath, which is the hot water filling of the bathtub 8, the bath heating load, and the hot water supply heating capacity. If the amount of remaining hot water is larger than the position where the first remaining hot water temperature detecting means 22 is provided, the normal bath heating operation described above (when there is sufficient remaining hot water) is performed. When the hot water supply load is large or the bath heating operation is continued, the bath heating capacity is decreased when the remaining hot water amount becomes smaller than the position where the first remaining hot water temperature detecting means 22 is provided.

  That is, the control means 25 detects the remaining hot water temperature based on the signal from the first remaining hot water temperature detection means 22 and detects that there is no remaining hot water at the position where the first remaining hot water temperature detection means 22 is provided. Then, the rotation speed of the heat source side circulation pump 9 is controlled so that the bath heating capacity is reduced.

  That is, the heat source side outlet temperature and the use side inlet temperature of the bath heat exchanger 6 obtained from the heat source side outlet temperature detection means 26 and the use side inlet temperature detection means 27 are detected, and the temperature difference between the two is normal (residual). The number of rotations of the heat source side circulation pump 9 is controlled so that the temperature difference (for example, 2K) is smaller than 5K in the bath heating operation (when there is sufficient hot water).

  The temperature difference may be set based on the temperature of the upper part of the hot water tank 5 supplied as a heat source to the bath heat exchanger 6, the required heating heat of the bathtub 8, the heating capacity of the hot water supply heating means 13, and the like. . The presence or absence of remaining hot water at the position where the first remaining hot water temperature detecting means 22 is provided is determined by whether the temperature at the position where the first remaining hot water temperature detecting means 22 is provided is higher or lower than a predetermined temperature. do it. For example, it is assumed that there is remaining hot water at 50 ° C. or higher, and there is no remaining hot water at less than 50 ° C.

In the above description, in order to reduce the bath heating capacity, the temperature difference between the heat source side outlet temperature of the bath heat exchanger 6 and the use side inlet temperature is smaller than in the case of normal bath heating operation (when there is sufficient remaining hot water). The temperature difference was controlled. If the heat source side inlet temperature of the bath heat exchanger 6 (that is, the upper temperature of the hot water tank 5) and the use side inlet temperature (that is, the temperature of the bathtub 8) are determined, the heating capacity of the bath heat exchanger 6 is It is determined by the flow rate and the flow rate on the user side. Eventually, in order to decrease the bath heating capacity, either the heat source side flow rate or the usage side flow rate, or both, may be reduced. In the configuration of FIG. 1, there is no means for directly measuring the flow rate,
The change in the flow rate may be obtained indirectly by measuring the change in the outlet temperature on the heat source side.

  That is, in order to reduce the bath heating capacity, the heat source side outlet temperature of the bath heat exchanger 6 may be set lower than that in the normal bath heating operation (when there is sufficient remaining hot water). That is, the control means 25 detects the heat source side outlet temperature of the bath heat exchanger 6 obtained from the heat source side outlet temperature detection means 26, and this temperature is the normal bath heating operation (when there is sufficient remaining hot water). The number of rotations of the heat source side circulation pump 9 is controlled so as to be lower than the heat source side outlet temperature.

  Note that lowering the heat source side outlet temperature and returning it to the hot water storage tank 5 means that the amount of heat of the hot water storage tank 5 is used more effectively. For example, the upper temperature of the hot water tank 5 is 65 ° C. and the temperature of the bathtub 8 is 42 ° C. When the temperature difference between the heat source side outlet temperature of the bath heat exchanger 6 and the use side inlet temperature is ΔT = 5 (K) in the case of normal (when there is enough remaining hot water) bath heating operation, and the remaining hot water amount decreases If the temperature difference is 2 (K), the heat source side outlet temperature of the bath heat exchanger 6 is 47 ° C. and 44 ° C., respectively. At this time, the amount of heat utilized effectively among the amount of heat stored in the hot water tank 5 is expressed by the following ratio. In other words, the amount of heat used when the temperature difference is 5 (K): the amount of heat used when the temperature difference is 2 (K) = (65-47) :( 65-44). Will be available.

  In the above-described control of bath heating, the amount of heat in the hot water tank 5 can be used more effectively, but basically only the heat already stored is used, and the amount of hot water in the hot water tank 5 decreases. Therefore, the second remaining hot water temperature detecting means 23 is provided at the same position or lower than the position where the first remaining hot water temperature detecting means 22 is provided. When the amount of remaining hot water becomes smaller than the position where the second remaining hot water temperature detecting means 23 is provided, the hot water supply heating operation is performed. That is, the water in the lower part of the hot water storage tank 5 is heated by the hot water supply heating means 13 to be hot water and stored in the upper part of the hot water storage tank 5. If it does in this way, new hot water will be made and the hot water used as a heat source required for bath heating will increase.

  As described above, if the hot water supply heating operation is performed when the amount of remaining hot water becomes smaller than the position where the second remaining hot water temperature detecting means 23 is provided, the hot water serving as a heat source required for bath heating increases. If there is a hot water supply load greater than the increased amount, the remaining hot water amount decreases. Therefore, the third remaining hot water temperature detecting means 24 is provided at a position above the position where the first remaining hot water temperature detecting means 22 is provided. The position of the third remaining hot water temperature detecting means 24 is provided where a minimum hot water supply load can be covered. When the amount of remaining hot water becomes smaller than the position where the third remaining hot water temperature detecting means 24 is provided, the control means 25 stops the bath heating operation by stopping the use side circulation pump 10 and the heat source side circulation pump 9. . However, if hot water is stored in the hot water tank 5, the bath heating operation is resumed.

  Of course, in order to heat the bathtub 8, the temperature difference between the hot water storage temperature of the hot water storage tank 5 and the temperature of the bathtub 8, which is the inlet temperature on the heat source side of the bath heat exchanger 6, is important. However, although the temperature of the hot water stored in the hot water storage tank 5 is slight, it decreases with time. Moreover, although the temperature of the bathtub 8 will fall if it is left without heating, it may become comparatively high temperature if it heats a bath. Therefore, the temperature difference between the hot water storage temperature of the hot water storage tank 5 and the temperature of the bathtub 8 that is the inlet temperature on the heat source side of the bath heat exchanger 6 varies depending on the situation. There are cases where the bath can be heated or not even at the same hot water storage temperature. In an extreme case, it is conceivable that the purpose of the bath heating is to take heat from the bathtub 8. On the other hand, even if the hot water storage temperature is relatively low, bath heating may be possible if the temperature of the bathtub 8 is low. Therefore, when there is a request for bath heating, if the temperature difference is equal to or greater than the predetermined temperature difference, the bath heating operation is performed. Conversely, if the temperature difference is less than the predetermined temperature difference, the bath heating operation is stopped. You just have to do it.

Therefore, in order to detect the inlet temperature on the heat source side of the bath heat exchanger 6, a heat source side inlet temperature detecting means 28 is provided in a pipe connecting the hot water tank 5 and the bath heat exchanger 6. When there is a request for heating of the bath, the control means 25 drives the heat source side circulation pump 9 and the use side circulation pump 10, and the heat source side inlet temperature detection means 28 and the use side inlet temperature detection means 27 make a bath heat exchanger. 6, the heat source side inlet temperature and the use side inlet temperature are measured, and the temperature difference is calculated.

  And if this temperature difference is more than the said predetermined temperature difference (for example, 10K), bath heating operation will be continued as it is, and if it is less than the said predetermined temperature difference, bath heating operation will be stopped. If such control is performed, the amount of heat of the hot water in the hot water storage tank 5 can be used effectively. In the above description, the heat source side inlet temperature detection means 28 is provided in the pipe connecting the hot water tank 5 and the bath heat exchanger 6, but the connection on the hot water tank 5 side connecting the bath heat exchanger 6 and the hot water tank 5. Even if the surface temperature of the hot water tank 5 in the vicinity of the heat source connection port 29 which is a part is detected, the same action and effect can be obtained.

  As described above, the bath heating operation is stopped when the amount of remaining hot water decreases or the temperature difference between the heat source side and the use side decreases. In this case, it is necessary to inform the user that the bath heating operation is stopped. Therefore, when the alarm device 30 is provided and the bath heating operation is stopped, the fact may be notified by voice, an alarm sound may be output, or displayed on the screen. Even if a special device is not provided as the alarm device 30, if the hot water heater has a remote controller (not shown), it can be shared by adding an alarm function to the remote controller.

  Further, since a heat pump heat source is used as the hot water supply heating means 13, high capacity or low power consumption is realized.

  Furthermore, hot water (approximately 90 ° C.) is stored in the hot water storage tank 5 by using carbon dioxide as the refrigerant sealed in the heat pump heat source. Therefore, the heat storage amount of the hot water storage tank 5 increases, and the heat radiation amount and operation time of the bath heating operation increase. It also contributes to global environmental conservation.

  As described above, the hot water supply device according to the present invention reduces the possibility of running out of hot water by reducing the heating capacity of the bath and reducing the amount of hot water used when the amount of hot water remaining in the hot water storage tank decreases. In addition, since it is possible to improve the comfort and convenience by reducing the state in which the bath cannot be rerun, it is not limited to bath heating, heating using hot water stored in the hot water, bathroom dryer etc. It can be applied to other uses.

Configuration diagram of a water heater in Embodiment 1 of the present invention Configuration of a conventional water heater

Explanation of symbols

5 Hot water storage tank 13 Hot water supply heating means 21 Bath heating means 22 First remaining hot water temperature detection means (remaining hot water amount detection means)
24 Third remaining hot water temperature detecting means (remaining hot water amount detecting means)
25 Control means

Claims (9)

Hot water supply heating means, hot water storage tank for storing hot water heated by the hot water supply heating means, hot water on the heat source side circulated from the hot water storage tank, and water on the use side or hot water circulated from the bathtub for heat exchange Heat source side circulation means for circulating hot water stored in the hot water storage tank to the bath heat exchanger, use side circulation means for circulating water or hot water from the bathtub to the bath heat exchanger, and the bath heat exchange a heat source-side outlet temperature detecting means for detecting a heat source-side outlet temperature of the vessel, the usage-side inlet temperature detecting means for detecting a usage-side inlet temperature of the bath heat exchanger, the remaining hot water detection for detecting the remaining hot water of the hot water storage tank And a control means for controlling the operation of the heat source side circulation means and the use side circulation means, and the heat source side outlet temperature is higher than when the remaining hot water amount detected by the remaining hot water amount detection means is smaller than a predetermined value. Inspection The heat source side circulation means so that the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the means and the use side inlet temperature of the bath heat exchanger detected by the use side inlet temperature detection means becomes small A water heater characterized by controlling the number of rotations . The hot water supply device according to claim 1, wherein the remaining hot water amount detecting means is a plurality of remaining hot water temperature detecting means for detecting the temperature of the hot water storage tank provided in the hot water storage tank. The water heater according to claim 1, wherein the number of revolutions of the heat source side circulation means is controlled so as to lower the heat source side outlet temperature of the bath heat exchanger. Heat source side circulation so that the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. The amount of remaining hot water for controlling the number of revolutions of the means is set as a first predetermined remaining hot water amount, and has a second predetermined remaining hot water amount set to an amount larger than the first predetermined remaining hot water amount. The hot water supply device according to any one of claims 1 to 3 , wherein when the amount is smaller than a second predetermined remaining hot water amount, a hot water supply heating operation for boiling the hot water storage tank is performed. Heat source side circulation so that the temperature difference between the heat source side outlet temperature of the bath heat exchanger detected by the heat source side outlet temperature detecting means and the user side inlet temperature of the bath heat exchanger detected by the user side inlet temperature detecting means becomes small. The amount of remaining hot water for controlling the number of revolutions of the means is set as a first predetermined remaining hot water amount, and has a third predetermined remaining hot water amount set to an amount smaller than the first predetermined remaining hot water amount. The water heater according to any one of claims 1 to 4 , wherein when the amount is smaller than a third predetermined remaining hot water amount, the heat source side circulation means is controlled to be stopped. If the heat source side inlet temperature of the bath heat exchanger is not higher than a predetermined temperature difference than the temperature of the bath, the water heater of any one of claims 1 to 5 for stopping the heat source side circulation means. The hot water heater according to claim 5 or 6, further comprising an alarm device for informing that the heat source side circulation means is stopped. The hot water heater according to any one of claims 1 to 7 , wherein the hot water heater is a heat pump cycle having a compressor. The water heater according to claim 8, wherein the refrigerant sealed in the heat pump cycle is carbon dioxide.

Images