JP5478354B2 - Hot water system - Google Patents

Description

The present invention relates to a hot water supply system that adjusts the temperature of hot water discharged from a hot water storage tank to a hot water having a predetermined temperature and supplies hot water to a hot water outlet formed of a faucet or a shower.

2. Description of the Related Art Conventionally, a hot water supply system has been developed that adjusts the temperature of hot water from a hot water storage tank to a hot water having a predetermined temperature and supplies the hot water to a hot water outlet made of a faucet or shower.
For example, as shown in FIG. 3, a hot water supply system 100 described in Non-Patent Document 1 includes a hot water storage tank 101 to which tap water is supplied from a supply port 108, and the hot water in the hot water storage tank 101 is supplied to a solar system 102. When the temperature of the hot water discharged from the hot water outlet 103 of the hot water storage tank 101 is higher than the set temperature, hot water is supplied to the hot water outlet 105 through the hot water circuit 106 having the switching valve 110 on the way. When the temperature of the hot water from 103 is lower than the set temperature, the temperature is raised to the set temperature by the hot water heater 104 via a hot water circuit 107 having a mixing valve 109 for mixing tap water with hot water, a hot water heater 104 and a switching valve 110 in series. Warm hot water is supplied to the hot water outlet 105.

Nagafu Manufacturing Co., Ltd. Solar Equipment General Catalog 2004 (I) “Sunwita” SW-04-0001-Kai p. 5

However, when the temperature of the hot water discharged from the hot water outlet 103 is higher than the set temperature, the hot water from the hot water outlet 103 is supplied to the hot water outlet 105 without being adjusted in temperature by the hot water outlet circuit 106, and thus supplied to the hot water outlet 105. The hot water becomes a temperature higher than the set temperature, and in order to discharge hot water at the set temperature from the hot water port 105, it is necessary to mix tap water at the hot water port 105.

Normally, tap water mixing at the hot water tap 105 is performed manually, and the temperature is adjusted while changing the amount of tap water while touching the hot water actually flowing out of the hot water port 105, and therefore flows during the temperature adjustment. Hot water is wasted, and this manual operation is troublesome for those who adjust the temperature.
The present invention has been made in view of such circumstances, and provides a hot water supply system capable of supplying hot water at a set temperature to a hot water outlet regardless of the relationship between the hot water temperature from the hot water storage tank and the set temperature. With the goal.

The hot water supply system for the purpose is a hot water supply system having a hot water storage tank having a tap water supply port at the bottom and a hot water outlet at the top, and a first mixing valve for mixing tap water with hot water from the hot water outlet. And a switching valve connected in series therewith, a first hot water supply circuit for supplying hot water at a predetermined temperature to a hot water outlet made of a faucet or a shower, and a second hot water mixed with the hot water from the hot water outlet A mixing valve, a water heater, and the switching valve in series, and a second tapping circuit for supplying hot water to the hot water outlet, and the temperature of hot water discharged from the hot water outlet of the hot water storage tank is T1, If the temperature set as the temperature of the hot water supplied to the hot water outlet is T2, and the temperature set in advance in the range of 0 ° C. to 5 ° C. is α, 1) T1−α ≧ T2 The first hot water circuit, Hot water from the hot water outlet and tap water are mixed by the first mixing valve to supply hot water to the hot water outlet as hot water of temperature T2, and 2) when T1-α <T2, the second hot water circuit The hot water supply is supplied to the hot water supply to the hot water outlet as hot water at a temperature T2 , and the hot water supply device is provided with a hot water filling function for supplying a predetermined amount of hot water at a predetermined temperature into the bathtub. A proportional valve is disposed between the outlet of the second mixing valve and the water heater, and supplies hot water to the hot water outlet via the first hot water circuit, and has a hot water filling function of the water heater. When operating, the proportional valve is operated to limit the flow rate of hot water passing through the proportional valve .

In the hot water supply system according to the present invention, assuming that the maximum temperature of hot water that can be supplied to the hot water supply is Tm, when T1-α <T2 and T1> Tm, the second mixing valve is connected to the hot water outlet. It is preferable that tap water is mixed with hot water at a predetermined ratio to obtain hot water having a temperature of Tm or less and supplied to the water heater.

In the hot water supply system according to the present invention, the flow rate of hot water passing through the proportional valve in a state where the flow rate is limited by the operation of the proportional valve is 10 to 50% of the fully open state where the proportional valve is not operated. preferable.
In the hot water supply system according to the present invention, it is preferable that a heat exchanger connected to the solar panel via a circulation circuit is provided at the inner lower portion of the hot water storage tank.

In the hot water supply system according to the present invention, the water heater is supplied from the solar panel by subtracting the amount of tap water entering the hot water storage tank through the supply port from the amount of hot water discharged from the hot water outlet. The calorific value calculating means for calculating the calorific value P of hot water discharged from the hot water storage tank is signal-connected, and the calorific value calculating means is used as the temperature of the hot water supplied to the hot water outlet and the bathtub. The amount of heat Q supplied to the hot water port and the bathtub is calculated from the temperature T2 set in the water heater and the amount of hot water supplied to the hot water port and the bathtub, and the amount of heat P with respect to the amount of heat Q It is preferable to determine the ratio of

In the hot water supply system according to the present invention, the ratio of the heat quantity P to the heat quantity Q is preferably displayed on a display signal-connected to the heat quantity calculation means.

In the hot water supply system according to claims 1 to 6 , when T1-α ≧ T2, hot water and tap water from the hot water outlet are mixed by the first mixing valve, and hot water at temperature T2 is supplied to the hot water tap, <In the case of T2, since hot water is supplied to the hot water outlet as hot water at the temperature T2 in the water heater, the temperature T2 set as the temperature of the hot water supplied to the hot water outlet and the temperature of the hot water discharged from the hot water outlet Regardless of the height relationship, hot water at temperature T2 can be supplied to the hot water outlet.

In particular, in the hot water supply system according to claim 2, when T1-α <T2 and T1> Tm, tap water is mixed with hot water from the outlet through the second mixing valve to obtain hot water having a temperature of Tm or less. Therefore, by supplying hot water having a temperature higher than Tm to the water heater, it is possible to prevent the water heater from being in a state where the temperature cannot be adjusted or from being damaged.

The hot water supply system according to any one of claims 1 to 6 , wherein when the hot water filling function of the water heater is in operation, when the hot water or hot water is supplied to the hot water outlet via the first hot water supply circuit, the proportional valve is operated. Since the flow rate of hot water passing through the water is limited, it is possible to avoid the temperature of the hot water supplied to the hot water outlet from greatly deviating from T2 due to the influence of hot water filling.

In the hot water supply system according to claim 3, since the flow rate of hot water passing through the proportional valve in a state where the flow rate is limited by the operation of the proportional valve is 10 to 50% of the fully open state where the proportional valve is not operated, While supplying hot water, it is possible to avoid that the temperature of the hot water supplied to the hot water outlet greatly deviates from T2.

Since the hot water supply system according to claim 4 has a heat exchanger connected to the solar panel at the lower inner side of the hot water storage tank, solar heat can be used to heat the hot water in the hot water storage tank, thereby reducing energy consumption. it can.

The hot water supply system according to claim 5 is characterized in that the calorific value calculating means uses a temperature T2 set in the water heater as a temperature of hot water supplied to the hot water outlet and the bathtub, and an amount of hot water supplied to the hot water outlet and the bathtub. Since the heat quantity Q supplied to the water inlet and the bathtub is calculated, the heat quantity calculation means can supply the hot water supplied to the hot water outlet and the bathtub without providing a temperature detection sensor or the like for actually measuring the temperature of the hot water supplied to the hot water outlet and the bathtub. The temperature can be acquired, and the number of parts and members necessary for calculating the heat quantity Q can be reduced.

In the hot water supply system according to claim 6 , since the ratio of the heat quantity P to the heat quantity Q is displayed on the display, the user of the hot water supply system calculates the contribution rate of the heat amount given from the solar panel to the heat amount of the used hot water. It can be easily confirmed.

It is explanatory drawing of the hot water supply system which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the hot water supply system which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the hot water supply system which concerns on a prior art example.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, a hot water supply system 10 according to a first embodiment of the present invention includes a hot water storage tank 11 that stores hot water and a solar system 12 that increases the temperature of the hot water in the hot water storage tank 11.
The hot water storage tank 11 includes a tap water supply port 13 for taking tap water into the hot water storage tank 11 at the bottom, and a hot water outlet 14 for discharging hot water in the hot water storage tank 11 at the top.

The solar system 12 has a solar panel 15 that absorbs solar heat and heats an internal heat transfer water, and a heat exchanger 17 that is connected to the solar panel 15 via a circulation circuit 16 at a lower portion inside the hot water storage tank 11. Is arranged. A circulation pump 18 and an accumulator tank (not shown) are attached to the circulation circuit 16, and the heat transfer water existing in the solar panel 15 flows in the circulation circuit 16 by the operation of the circulation pump 18 and passes through the heat exchanger 17. Return to the solar panel 15. The heat exchanger 17 heats the hot water in the hot water storage tank 11 by heat exchange using the heat medium water heated by the solar panel 15 as a heat source. The accumulation tank is provided to absorb the expansion of the heat transfer water due to heating.

The tap 14 is connected to the first hot water inlet 20 of the first mixing valve 19 that mixes the tap water with the hot water discharged from the hot water outlet 14, and is also connected to the hot water discharged from the hot water outlet 14. A pipe is connected to the second hot water inlet 23 of the second mixing valve 22 for mixing water.
The first mixing valve 19 is connected to the water pipe 24 in addition to the first hot water inlet 20, and the hot water from which tap water is mixed with the hot water from the outlet 14. And a first outlet 26 for delivering the liquid.

The second mixing valve 22 mixes the tap water with the second tap water inlet 27 connected to the water pipe 24 in addition to the second hot water inlet 23 and supplied with tap water, and hot water from the outlet 14. And a second outlet 28 for feeding out the hot and cold water. The water pipe 24 is also connected to the supply port 13 to supply tap water to the hot water storage tank 11 through the supply port 13.

The first mixing valve 19 can change the size of the cross-sectional area of each of the first hot water inlet 20 and the first tap water inlet 25, or can completely block the flow path. The amount of hot water from the hot water outlet 14 that enters from the hot water inlet 20 and the amount of tap water that enters from the first tap water inlet 25 can be adjusted to obtain hot water of a predetermined temperature, and water can be discharged from the first outlet 26.
In addition, the second mixing valve 22 can change the size of the cross-sectional area of each of the second hot water inlet 23 and the second tap water inlet 27, or can completely block the flow path. The amount of hot water from the hot water outlet 14 that enters from the second hot water inlet 23 and the amount of tap water that enters from the second tap water inlet 27 can be adjusted to obtain hot water of a predetermined temperature and discharged from the second outlet 28.

Therefore, the temperature of the hot water discharged from the first and second outlets 26 and 28 by the first and second mixing valves 19 and 22 is not lower than the temperature of the hot water discharged from the tap 14 above the tap water temperature. It becomes the range.
A switching valve 39 is connected to the first mixing valve 19 in series. The first mixing valve 19 includes the first mixing valve 19 and the switching valve 39, and the hot water outlet 30 of the hot water storage tank 11 includes a faucet or a shower. A first tapping circuit 31 for supplying hot water at a predetermined temperature is formed.

In addition, a proportional valve 33 that limits the flow rate of hot water passing therethrough, a hot water heater 34 that heats hot water, and a switching valve 39 are connected in series to the second mixing valve 22, and the second mixing valve 22 is proportional to the second mixing valve 22. A second hot water supply circuit 32 that has a valve 33, a water heater 34, and a switching valve 39 and supplies hot water at a predetermined temperature from the hot water outlet 14 of the hot water storage tank 11 to the hot water outlet 30 is formed.
The water heater 34 includes a heating unit 35 that heats hot water passing through the second hot water circuit 32 with heat generated by combustion or the like.

Further, the proportional valve 33 is composed of, for example, a motor valve, and the size of the cross-sectional area of the flow path can be changed. By reducing the cross-sectional area of the flow path, the flow rate of hot water passing through the proportional valve 33 is limited (reduced). )
The switching valve 39 is connected to the first switching base 36 connected to the first outlet 26, the second switching base 37 connected to the hot water outlet of the heating unit 35, and the hot water outlet 30. Since it has a connected hot water outlet 38 and one of the first and second switching base ports 36 and 37 is in a state where hot water can pass through, the other is in a state where hot water cannot pass through. The hot water supply path to the water port 30 can be switched between the first hot water circuit 31 and the second hot water circuit 32.

A thermistor 40 as an example of a temperature sensor capable of measuring the temperature of hot water discharged from the hot water outlet 14 is provided in the vicinity of the hot water outlet 14 in the upper part of the hot water storage tank 11. A thermistor 41 for measuring is attached.
The hot water supply system 10 includes a control unit (not shown) connected to the first mixing valve 19, the second mixing valve 22, the proportional valve 33, the water heater 34, the switching valve 39, and the thermistors 40 and 41. .

In the control unit, a temperature T2 of hot water supplied to the hot water outlet 30 (hereinafter also referred to as “set temperature T2”) and a temperature α in a range of 0 degrees to 5 degrees are preset. The control unit detects the temperature T1 of the hot water measured by the thermistor 40, compares the temperature obtained by subtracting α from T1 with T2, and supplies the hot water to the hot water outlet 30 via the first hot water outlet circuit 31 based on the comparison result. Or whether to supply hot water to the hot water outlet 30 via the second hot water supply circuit 32 is determined. In addition, although temperature T1 changes with weathers, 40 to 80 degreeC and temperature T2 are the range of 30 to 75 degreeC. Since the first and second mixing valves 19 and 22 are structurally incapable of completely stopping the inflow of tap water from the first and second tap water inlets 25 and 27, respectively, T1 The temperature obtained by subtracting α from is compared with T2. For example, 2 ° C. is set as α.

In addition, the control unit stores the set temperature T2 and the like in the inside, determines the hot water supply circuit to the hot water outlet 30, and the hot water from the outlet 14 at the first and second mixing valves 19, 22. ROM with a program for executing calculation of the proportion of tap water to be mixed and the following control, ROM and the outside (first mixing valve 19, second mixing valve 22, proportional valve 33, water heater 34, switching valve 39 and thermistors 40 and 41), and an interface for performing signal conversion and signal transmission.

In the case of T1-α ≧ T2, the control unit operates the switching valve 39 so that the first switching base 36 can pass hot water.
When T1-α ≧ T2, tap water is mixed with hot water from the hot water storage tank 11 at a predetermined ratio by the first mixing valve 19 to obtain hot water having a temperature T2, and through the first hot water circuit 31, Hot water of temperature T2 is supplied to the hot water outlet 30.

In the case of T1-α <T2, the control unit operates the switching valve 39 to allow the hot water to pass through the second switching base 37, and the second mixing valve 22 through the second hot water circuit 32. Hot water is supplied to the water heater 34. The water heater 34 uses the hot water supplied from the second mixing valve 22 as hot water having a temperature T2, and supplies hot water having a temperature T2 to the hot water outlet 30.
Therefore, the hot water supply system 10 can supply hot water at the temperature T2 to the hot water outlet 30 regardless of the relative level relationship between the temperature T1 and the temperature T2, and without mixing the tap water at the hot water outlet 30, for example. Water can be discharged stably at a set temperature T2. In addition, since the water pipe 43 which supplies tap water is connected with the hot water outlet 30, by mixing tap water with the hot water outlet 30, hot water lower than temperature T2 may be discharged from the hot water outlet 30. it can.

Here, parts, members, and the like constituting the water heater 34 have individual heat resistance performances, and the water heater 34 has a specification that always combusts when hot water flows and raises the temperature of the hot water. , Avoiding supplying hot water having a high temperature (for example, 80 ° C.) that may cause danger to the user to the hot water outlet 30 and supplying the hot water at the temperature T2 that has flowed into the hot water outlet 30 to a temperature exceeding the temperature T2. Therefore, a maximum temperature of hot water that can be supplied to the water heater 34 (a temperature calculated from the minimum amount of combustion heat of the water heater 34, for example, 35 ° C.) is determined.
Assuming that the maximum temperature of hot water that can be supplied to the water heater 34 is Tm, when T1-α <T2 and T1> Tm, the control unit operates the second mixing valve 22 to enter hot water from the second hot water inlet 23. Adjusting the amount of hot water to be added and the amount of tap water entering from the second tap water inlet 27, the tap water is mixed with the hot water from the outlet 14 at a predetermined ratio by the second mixing valve 22, and the temperature is below Tm. Hot water is supplied to the water heater 34. The water heater 34 heats hot water having a temperature of Tm or less supplied from the second mixing valve 22 by the heating unit 35 to make hot water having a temperature T2, and supplies hot water having a temperature T2 to the hot water outlet 30.

A thermistor 44 for measuring the temperature of hot water discharged from the second outlet 28 of the second mixing valve 22 is provided between the proportional valve 33 and the water heater 34, and is switched to the first mixing valve 19. A thermistor 49 for measuring the temperature of hot water discharged from the first outlet 26 of the first mixing valve 19 is provided between the valves 39. The thermistors 44 and 49 are connected to the control unit, and the control unit can detect from the measurement value obtained by the thermistor 44 that the temperature of the hot water actually discharged from the second outlet 28 is equal to or lower than Tm. Further, it can be detected from the measured value by the thermistor 49 that the temperature of the hot water actually discharged from the first outlet 26 is T2.
A bathtub pipe 46 reaching the bathtub 45 is connected to the heating unit 35 of the water heater 34, and an opening / closing valve 47 and a valve 47 are arranged in order from the heating unit 35 toward the bathtub 45 in the portion located in the water heater 34 of the bathtub pipe 46. A check valve 48 is arranged. In addition, the control part is connected to the on-off valve 47, and the control part can operate the on-off valve 47 to a state where hot water can pass and a state where hot water cannot pass.

The hot water heater 34 is provided with a hot water filling function for putting a predetermined amount of hot water at a predetermined temperature into the bathtub 45, and the control unit can receive from the water heater 34 an operation of the hot water filling function and a stop signal.
When the hot water filling function is activated, the control unit receives the operation signal, sets the open / close valve 47 in a state in which hot water can pass, and the hot water discharged from the heating unit 35 enters the bathtub 45 through the bathtub pipe 46. The on-off valve 47 is in a state where hot water cannot pass when the hot water filling to the bathtub 45 is not performed. The check valve 48 allows hot water to pass from the heating unit 35 side toward the bathtub 45, but does not pass hot water (hot water) from the opposite direction, that is, from the bathtub 45 side to the heating unit 35. It is provided so that hot water does not flow into the water pipe 24 side.

When hot water filling to the bathtub 45 is started while hot water is being supplied to the hot water outlet 30 through the first hot water outlet circuit 31, the control unit makes the on-off valve 47 in a state in which hot water can pass, In addition to supplying the hot water discharged from the hot water outlet 14 to the first hot water inlet 20, the hot water is also started to be supplied to the second hot water inlet 23. At this time, since all of the hot water from the hot water outlet 14 flows to the first hot water inlet 20 before the start of the hot water filling, a part of the hot water also flows to the second hot water inlet 23. The amount of hot water supplied to 20 decreases, and the amount of water flowing into the first tap water inlet 25 also decreases, so the temperature of the hot water discharged from the first outlet 26 may temporarily differ from the temperature T2. .

Therefore, the control unit operates the first mixing valve 19 when the temperature falls below the temperature T2 to bring the hot water discharged from the first outlet 26 to the temperature T2, and enters the water from the first tap water inlet 25. When the amount of tap water is reduced and the temperature exceeds T2, the amount of hot water from the hot water outlet 11 of the hot water storage tank 11 entering the first hot water inlet 20 is reduced, but the hot water discharged from the first outlet 26 has a temperature. Until reaching T2, hot water having a temperature different from the set temperature T2 is supplied to the hot water outlet 30.

When the control unit makes the on-off valve 47 in a state in which hot water can pass through the first hot water supply circuit 31 while supplying hot water to the hot water outlet 30, the second outlet 28, the water heater 34, Since the flow rate of hot water passing through the proportional valve 33 is limited (reduced) and the amount of hot water entering the second hot water inlet 23 is reduced, the hot water from the outlet 14 is operated. Until the temperature of hot water supplied to the first hot water inlet 20 and supplied to the hot water port 30 deviates greatly from the temperature T2, and the temperature of hot water supplied to the hot water port 30 is set to the set temperature T2. To shorten the time. Since the control unit is connected to the switching valve 39, it can detect that hot water from the hot water outlet 14 is being supplied to the hot water outlet 30 through the first hot water circuit 31.

In addition, when the hot water filling function of the water heater 34 is in operation, the control unit also operates the proportional valve 33 to operate the proportional valve 33 when the hot water starts to be supplied to the hot water outlet 30 via the first hot water circuit 31. Limiting the flow rate of hot water passing therethrough, avoiding the temperature of hot water supplied to the hot water outlet 30 from being significantly lower than the set temperature T2, and further allowing the temperature of hot water supplied to the hot water outlet 30 to reach the set temperature T2. Shorten.
Note that the flow rate of hot water passing through the proportional valve 33 is limited when hot water is supplied to the hot water outlet 30 via the first hot water outlet circuit 31 and the hot water filling function is activated.

Here, the flow rate of hot water passing through the proportional valve 33 in a state where the flow rate of hot water passing through the operation of the proportional valve 33 is limited is 10 to 50%, preferably 20 to the fully open state where the proportional valve 33 is not operated. By setting the ratio to 40%, hot water at a temperature that does not cause a major inconvenience in discharging hot water from the hot water outlet 30 can be supplied to the hot water outlet 30 while supplying hot water to the bathtub 45.

Next, a hot water supply system 10a according to a second embodiment of the present invention will be described.
In addition, about the component same as the hot water supply system 10, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 2, the hot water supply system 10 a includes a water heater 34 a including a hot water temperature setting unit 42, and the hot water temperature setting unit 42 includes a temperature T <b> 2 as the temperature of hot water supplied to the hot water outlet 30 and the bathtub 45. Is set. The water heater 34a is provided with a display 50 for displaying the value of the temperature T2 set in the hot water temperature setting means 42, and the user of the hot water supply system 10a can confirm the set temperature T2 from the display on the display 50. it can. The hot water temperature setting means 42 includes, for example, a program installed in a microcomputer built in the hot water heater 34a.

A flow rate for measuring the amount of hot water discharged from the first outlet 26 of the first mixing valve 19 and the second outlet 28 of the second mixing valve 22 in the first and second hot water discharge circuits 31 and 32. Sensors 51 and 52 are provided, respectively.
The flow rate sensors 51 and 52 are connected to the calorific value calculating means 53 in signal form, and the calorific value calculating means 53 calculates the total calorific value supplied to the hot water outlet 30 and the bathtub 45. The hot water supply system 10a is provided with a control unit (not shown) that controls the mixing valve and the like, and the calorific value calculation means 53 is composed of, for example, a program installed in a ROM included in the control unit, and the flow rate sensor 51 via the interface. , 52, thermistors 41, 44, 49 and hot water temperature setting means 42.

The amount of hot water passing through the first mixing valve 19 (finally supplied to the hot water inlet 30) is P1, and the amount of heat of the hot water passing through the second mixing valve 22 (finally supplied to the hot water inlet 30 and the bathtub 45). ) Assuming that the amount of hot water is P2, the calorie calculating means 53 calculates the amount of heat P1 and the amount of heat P2 based on the information obtained from the thermistor 49 and the flow sensor 51 and the information obtained from the thermistor 44 and the flow sensor 52, respectively. The calorific value calculation means 53 acquires the temperature of tap water from the thermistor 41, and calculates the calorific value P3 by multiplying the tap water temperature by the amount of hot water that has passed through the flow rate sensors 51 and 52.
Then, the heat quantity calculation means 53 calculates the heat quantity P by subtracting the heat quantity P3 from the value obtained by adding the heat quantity P2 to the heat quantity P1. Of the amount of heat given to the hot water storage tank 11 by the heat transfer water supplied from the solar panel 15, the amount of heat P is the amount of heat emitted from the hot water storage tank 11 through the hot water outlet 14 (that is, hot water discharged from the hot water outlet 14. The amount of heat obtained by subtracting the amount of heat of tap water entering the hot water storage tank 11 through the supply port 13 from the amount of heat).

The calorie calculation means 53 detects the amount of hot water supplied to the hot water outlet 30 and the bathtub 45 through the flow sensors 51 and 52 based on the information acquired from the flow sensors 51 and 52, and the hot water temperature setting means 42. The amount of heat Q obtained by multiplying the temperature T2 acquired from the above by the amount of hot water supplied to the hot water outlet 30 and the bathtub 45 on the time axis is calculated. The calorie calculating means 53 divides the calorie P by the calorie Q to obtain the ratio (P / Q) of the calorie P to the calorie Q, and the solar with respect to the calorie of the whole hot water supplied to the hot water outlet 30 and the bathtub 45 is obtained. The contribution rate of the amount of heat given to the hot water storage tank 11 by the panel 12 via the heat transfer water is calculated. The value of P / Q is displayed on a display 54 that is signal-connected to the calorific value calculation means 53 via an interface.
When the hot water supply function is not provided in the water heater, the amount of hot water supplied to the hot water inlet 30 through the flow rate sensors 51 and 52 is detected by the heat amount calculation means 53, and the hot water temperature setting means 42 is detected. The amount of heat obtained by multiplying the temperature T2 (set as the temperature of the hot water supplied to the hot water inlet 30) from the amount of hot water supplied to the hot water outlet 30 is integrated on the time axis, Calculate the heat quantity Q.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, raising the hot water in the hot water storage tank 11 is not limited to the solar system 12, and a heat pump heat source machine and other heating sources can be employed. Further, the flow rate of hot water passing through the proportional valve 33 in a state where the flow rate is limited by the operation of the proportional valve 33 is 10 to 50%, preferably 20 to 40% of the fully opened state, but constitutes a hot water supply system. This value can be changed depending on the member, water pressure, and the like. Further, the water heater can have a remote control device including a display for displaying the temperature set in the hot water temperature setting means and the hot water temperature setting means. The display for displaying the value of P / Q can be provided in a remote control device capable of data communication with the calorific value calculation means.

10, 10a: Hot water supply system, 11: Hot water storage tank, 12: Solar system, 13: Supply port, 14: Hot water outlet, 15: Solar panel, 16: Circulation circuit, 17: Heat exchanger, 18: Circulation pump, 19: 1st mixing valve, 20: 1st hot water inlet, 22: 2nd mixing valve, 23: 2nd hot water inlet, 24: Water pipe, 25: 1st tap water inlet, 26: 1st outlet 27: second tap water inlet, 28: second outlet, 30: hot water outlet, 31: first hot water circuit, 32: second hot water circuit, 33: proportional valve, 34, 34a: water heater, 35: heating unit, 36: first switching base, 37: second switching base, 38: hot water outlet, 39: switching valve, 40, 41: thermistor, 42: hot water temperature setting means, 43: water supply Pipe, 44: thermistor, 45: bathtub, 46: bathtub piping, 47: on-off valve, 48: check valve, 4 : Thermistor, 50: display, 51, 52: flow sensor, 53: heat calculating means, 54: Display

Claims (6)

In a hot water supply system having a hot water storage tank with a tap water supply port at the bottom and a hot water outlet at the top,
A first tapping circuit that includes a first mixing valve that mixes tap water with hot water from the tap and a switching valve that is connected in series to the tap, and that supplies hot water at a predetermined temperature to a tap that is a faucet or shower. When,
A second mixing valve for mixing tap water with hot water from the hot water outlet, a water heater, and the switching valve in series, and a second hot water supply circuit for supplying hot water to the hot water outlet,
The temperature of hot water discharged from the hot water outlet of the hot water storage tank is T1, the temperature set as the temperature of hot water supplied to the hot water tap is T2, and the temperature preset in the range of 0 to 5 degrees is α. Then,
1) In the case of T1-α ≧ T2, hot water from the hot water outlet and tap water are mixed by the first mixing valve through the first hot water circuit, and the hot water at temperature T2 is mixed into the hot water outlet. Supply hot water,
2) In the case of T1-α <T2, the hot water is supplied to the hot water outlet as hot water at a temperature T2 by supplying the hot water supply device via the second hot water circuit ,
In addition, the water heater is provided with a hot water filling function for putting a predetermined amount of hot water at a predetermined temperature into the bathtub, a proportional valve is disposed between the outlet of the second mixing valve and the water heater, Hot water is supplied to the hot water outlet through the hot water outlet circuit, and when the hot water filling function of the water heater is operating, the proportional valve is operated to limit the flow rate of hot water passing through the proportional valve. Hot water supply system characterized by In the hot water supply system according to claim 1, when the maximum temperature of hot water that can be supplied to the water heater is Tm,
In the case of T1-α <T2 and T1> Tm, tap water is mixed with hot water from the outlet at a predetermined rate by the second mixing valve to obtain hot water having a temperature equal to or lower than Tm and supplied to the water heater. Hot water supply system characterized by The hot water supply system according to claim 1 or 2 , wherein the flow rate of hot water passing through the proportional valve in a state where the flow rate is limited by the operation of the proportional valve is 10 to 50% of the fully open state where the proportional valve is not operated. A hot water supply system characterized by being. The hot water supply system according to any one of claims 1 to 3 , wherein a heat exchanger connected to a solar panel via a circulation circuit is provided at an inner lower portion of the hot water storage tank. Hot water system. 5. The hot water supply system according to claim 4 , wherein the hot water supply device subtracts the amount of tap water entering the hot water storage tank through the supply port from the amount of hot water discharged from the hot water outlet from the solar panel. A calorific value calculating means for calculating the calorific value P of the hot water discharged from the hot water storage tank, given by the supplied heat transfer water, is signal-connected,
The calorific value calculating means is configured to calculate the hot water outlet from the temperature T2 set in the water heater as the temperature of hot water supplied to the hot water outlet and the bathtub, and the amount of hot water supplied to the hot water outlet and the bathtub. And the amount Q of heat supplied to the bathtub is calculated, and the ratio of the amount of heat P to the amount of heat Q is obtained. 6. The hot water supply system according to claim 5 , wherein the ratio of the heat quantity P to the heat quantity Q is displayed on a display signal-connected to the heat quantity calculation means.

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