JP2010286192A - Heat recovering system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat recovering system recovering heat again after termination of recovering of heat of remaining hot water in a bathtub. <P>SOLUTION: This heat recovering device includes a heat exchanger 13 for heating hot water/water in a hot water storage tank 11 while using the remaining hot water in the bathtub 12 as a heat source, a first temperature sensor 14 for measuring a temperature of the hot water/water at a lower section in the hot water storage tank 11, a second temperature sensor 15 for measuring a temperature of the remaining hot water in the bathtub 12, and a control device 16 detecting the temperatures measured by the first temperature sensor 14 and the second temperature sensor 15, and recovering heat of the remaining hot water in the bathtub 12. The control device 16 records the temperature X2 measured by the first temperature sensor 14 at a time when the heat recovery of the remaining hot water in the bathtub 12 is terminated, then measures a temperature Y2 of the remaining hot water in the bathtub 12 by the second temperature sensor 15, when it detects that the temperature measured by the first temperature sensor 14 reaches a temperature X3 lower than a temperature obtained by subtracting a predetermined set temperature T2 from the temperature X2, and recovers the heat of remaining hot water in the bathtub 12 when the temperature Y2 is higher than the temperature X3 by a set temperature T1 or more. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a heat recovery system that recovers heat of hot water remaining in a bathtub and heats hot water in a hot water storage tank.

Conventionally, a heat recovery system that recovers the heat of hot water remaining in a bathtub and heats hot water in a hot water storage tank has been proposed, and a specific example thereof is described in Patent Document 1, for example.
The heat recovery system described in Patent Document 1 has a heat exchanger that heats hot water sent from the lower part of the hot water storage tank, circulates the remaining hot water in the bathtub, and uses the remaining hot water in the bathtub as a heat source in the heat exchanger from the hot water storage tank. The hot water taken out is heated to recover the remaining hot water in the bathtub.

The heat exchanger can stably heat an object to be heated when the heat source for heating is higher than a predetermined temperature by a temperature higher than a predetermined temperature because of its specifications. For this reason, the heat recovery of the remaining hot water in the bathtub by the heat exchanger is performed on condition that the remaining hot water in the bathtub is higher than the predetermined temperature by the hot water in the lower part of the hot water storage tank, and ends when the temperature becomes lower than the predetermined temperature. .
And since hot water storage tanks generally have better heat retention than bathtubs, and the temperature drop due to heat dissipation is more gradual than bathtubs, if there is no temperature change other than heat dissipation, the hot water tanks and hot water tanks again after heat recovery. The temperature relationship of the remaining hot water is not a condition for recovering heat, and the heat recovery of the remaining hot water in the bathtub is completed once.

JP 2008-111574 A

However, after the heat recovery is completed, there is hot water supply from the hot water storage tank to the kitchen, washroom, etc., and tap water may be supplied to the hot water storage tank in order to keep the amount of hot water in the hot water storage tank constant. The temperature of the hot water may decrease, and the temperature relationship between the hot water in the hot water storage tank and the remaining hot water in the bathtub may be provided with a condition for recovering heat.
The present invention has been made in view of such circumstances, and an object thereof is to provide a heat recovery system capable of performing heat recovery again after the end of heat recovery.

The heat recovery system according to the present invention that meets the above-described object includes a hot water storage tank for storing hot water and heat for recovering heat of the remaining hot water in the bathtub by heating the hot water in the hot water storage tank using the remaining hot water in the bathtub as a heat source. A first temperature sensor for measuring the temperature of the hot water in the lower part of the hot water storage tank; a second temperature sensor for measuring the temperature of the remaining hot water in the bathtub; the first temperature sensor and the first temperature sensor; And a control device that detects the temperature measured by the temperature sensor of 2 and recovers the heat of the remaining hot water in the bathtub. The control device (1) when the heat recovery start input is received, The temperature sensor 1 measures the temperature X1 of the hot water in the lower part of the hot water storage tank, and measures the temperature Y1 of the remaining hot water in the bathtub by the second temperature sensor, and (2) the temperature Y1 is the temperature. Preset temperature set from X1 On condition that it is higher by 1 or more, it has means B for sending hot water from the hot water storage tank to the heat exchanger and recovering heat from the remaining hot water in the bathtub by the heat exchanger, and the control device comprises: When the heat recovery by means B is completed, there is no new heat recovery start input, and standby is possible for automatically recovering the remaining hot water in the bathtub under specific conditions (described below). It becomes a state.

In the heat recovery system according to the present invention, the control device (1) means C for recording the temperature X2 measured by the first temperature sensor when the heat recovery of the remaining hot water in the bathtub by the means B is completed. (2) Thereafter, when it is detected that the temperature measured by the first temperature sensor has become a temperature X3 lower than a temperature obtained by subtracting a preset set temperature T2 from the temperature X2, the remaining hot water in the bathtub Means D for measuring the temperature Y2 of the bathtub by means of the second temperature sensor; and (3) means E for recovering heat of the remaining hot water in the bathtub when the temperature Y2 is higher than the temperature X3 by the set temperature T1. It is preferable to have.

In the heat recovery system according to the present invention, when the controller detects that the elapsed time from the heat recovery start input has reached a preset time P, the heat recovery of the remaining hot water in the bathtub is not started. It is preferable to have means G for bringing it into a state.

In the heat recovery system according to the present invention, heating means for heating the hot water in the hot water storage tank is provided, and the control device detects the temperature of the hot water tank in the lower part detected after the heating means finishes heating the hot water in the hot water storage tank. The minimum temperature Xb of hot water is recorded, and the temperature of the remaining hot water in the bathtub at the time when the heat recovery by the means B or the means E is completed is a temperature obtained by adding the minimum temperature Xb to a preset set temperature T3 In the case where the temperature is lower, it is preferable to have a means H for not starting heat recovery of the remaining hot water in the bathtub.

In the heat recovery system according to claims 1 to 4, when the heat recovery of the remaining hot water in the bathtub is finished, there is no new heat recovery start input, and the heat recovery of the remaining hot water in the bathtub is automatically performed under specific conditions. Since it is in a standby state that can be performed, the heat recovery of the hot water in the bathtub can be automatically performed multiple times by one heat recovery start input, and the energy consumption for heating the hot water in the hot water storage tank can be reduced. It is possible to reduce.

In particular, the heat recovery system according to claim 2 measures the temperature X2 in the lower part of the hot water storage tank by the first temperature sensor, and then the temperature measured by the first temperature sensor changes the set temperature T2 from the temperature X2. When it is detected that the temperature X3 is lower than the subtracted temperature, the temperature Y2 of the remaining hot water in the bathtub is measured. When the temperature Y2 is higher than the temperature X3 by the set temperature T1, the heat recovery of the remaining hot water in the bathtub is performed. Therefore, after the heat recovery is completed, the remaining hot water in the bathtub can be recovered again, and the energy consumption for heating the hot water in the hot water storage tank can be reduced.

In the heat recovery system according to claim 3, since the heat recovery is not started when the set time P has elapsed from the heat recovery start input, the control device causes the hot water in the lower part of the hot water storage tank and the remaining hot water in the bathtub to be hot. In order to detect that the temperature condition can be recovered, it is possible to avoid continuing the operation for a long time, and to suppress the power consumption required for the operation.

The heat recovery system according to claim 4 records the minimum temperature Xb of hot water in the lower part of the hot water tank measured after heating of the hot water in the hot water tank by the heating means, and the remaining of the bathtub when the heat recovery is completed When the temperature of the hot water is lower than the temperature obtained by adding the minimum temperature Xb to the set temperature T3, the heat recovery is not started. Therefore, after the heat recovery is completed, the control device is stopped without being continuously operated. The required power consumption can be suppressed.

It is a schematic explanatory drawing which shows the heat recovery system which concerns on one embodiment of this invention. It is a flowchart figure which shows the operation | movement of the heat recovery by the heat recovery system.

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 heat recovery system 10 according to an embodiment of the present invention includes a hot water storage tank 11 for storing hot water and a hot water in the hot water storage tank 11 using the remaining hot water in the bathtub 12 as a heat source. A heat exchanger 13 for recovering the heat of the remaining hot water in 12, a first temperature sensor 14 (for example, a thermistor) for measuring the temperature of the hot water in the lower part of the hot water storage tank 11, and the temperature of the remaining hot water in the bathtub 12. The temperature measured by the second temperature sensor 15 (for example, the thermistor), the first temperature sensor 14 and the second temperature sensor 15 is detected, and the remaining hot water in the bathtub 12 is recovered (executed). And a control device 16. Further, the heat recovery system 10 is provided with heating means 21 for heating the hot water taken out from the lower part of the hot water storage tank 11, supplying hot water to the upper part of the hot water storage tank 11, and heating the hot water in the hot water storage tank 11.

At the bottom of the hot water storage tank 11 is provided a tap water inlet 18 through which tap water is supplied from the water pipe 17, and when the amount of hot water in the hot water storage tank 11 decreases due to hot water supply to the bathtub 12 or the kitchen, the hot water storage tank 11, tap water is supplied from the tap water inlet 18.
Furthermore, at the lower part of the hot water storage tank 11, a water outlet 19 for sending hot water heated by the remaining hot water of the bathtub 12 from the hot water storage tank 11 and a temperature of hot water disposed at the same height as the water outlet 19 are measured. The first temperature sensor 14 can measure the temperature of the hot water sent out from the water outlet 19.

The hot water storage tank 11 is provided with a hot water outlet 22 through which hot water serving as a heat source for heating the hot water in the bathtub 12 is sent out from the hot water storage tank 11. A first three-way valve 20 that pipes only one of hot water sent from the outlet 19 and hot water sent out from the outlet 22 to the heat exchanger 13 is connected to the outlet 19 and the outlet 22 by piping. .
In the lower part of the hot water storage tank 11, hot water sent out from the water outlet 19 and hot water sent out from the hot water outlet 22 flow into the hot water storage tank 11 through the first three-way valve 20 and the heat exchanger 13. A mouth 24 is provided.
A first pump 25 is provided between the heat exchanger 13 and the hot water inlet 24, and the first pump 25 takes out hot water or hot water from the hot water storage tank 11 from the water outlet 19 or the hot water outlet 22 by its operation. , Can be sent to the hot water entrance 24

A mixing valve 26 is connected to the upper part of the hot water storage tank 11, and the mixing valve 26 mixes hot water discharged from the upper part of the hot water storage tank 11 with tap water supplied from the water pipe 17 and has a predetermined temperature. Hot water is supplied to the bathtub 12.
On the outlet side of the hot water of the mixing valve 26, an opening / closing valve 27 for switching whether or not the hot water mixed by the mixing valve 26 is sent to the bathtub 12 is provided. A check valve 28 that allows hot water to pass from the side to the bathtub 12 side but does not pass hot water from the bathtub 12 side to the on-off valve 27 side is disposed.

A bathtub circuit 30 for returning the remaining hot water taken out from the bathtub 12 to the bathtub 12 again via the heat exchanger 13 is formed by connecting both ends thereof to the bathtub 12. The bathtub circuit 30 has a second pump 32 for flowing the remaining hot water taken out from the bathtub 12 through the operation to the bathtub circuit 30, a second temperature sensor 15 for measuring the temperature of the remaining hot water taken out from the bathtub 12, and A water flow sensor 33 for determining the presence or absence of remaining hot water in the bathtub 12 flowing through the bathtub circuit 30 is attached.

Below the hot water storage tank 11, there is provided a water intake 34 for sending out hot water from the hot water storage tank 11, and the water intake 34 is connected via a heat exchanger 35 for heating the hot water sent out from the water intake 34. Piping is connected to the top of the. Between the water intake 34 and the heat exchanger 35, a third pump 36 is arranged that takes hot water from the water intake 34 and sends the hot water to the heat exchanger 35.
An example of the heating means 21 for heating the hot water in the hot water storage tank 11 taken out from the water intake port 34 by the operation of the third pump 36 is a heat exchanger 35, a heat medium circulation circuit 37 through which the heat medium circulates, and a heat source device. The heat pump type heat source device 38 is configured.

The heat exchanger 35 is connected to a heat pump heat source device 38 via a heat medium circulation circuit 37, and heats hot water in the hot water storage tank 11 using the heat medium heated by the heat pump heat source device 38 as a heating source.
The hot water heated by the heat exchanger 35 is supplied to the upper part of the hot water storage tank 11, and the hot water storage tank 11 has the hottest hot water in the upper part, and the temperature of the hot water decreases as it approaches the lower part from the upper part. It will be in the state which has low temperature hot water.

A second three-way valve 39 is disposed between the heat exchanger 35 and the upper part of the hot water storage tank 11, and the second three-way valve 39 is connected to the lower part of the hot water storage tank 11 through a bypass pipe 40. The hot water or hot water sent from the exchanger 35 can be switched to the upper part of the hot water storage tank 11 or to the lower part of the hot water storage tank 11 via the bypass pipe 40.
The second three-way valve 39 bypasses the hot water when the temperature of the hot water that has passed through the heat exchanger 35 has not risen to a preset temperature Q (for example, 40 ° C.) immediately after the operation of the heat pump heat source device 38. The hot water is sent to the lower part of the hot water storage tank 11 via the pipe 40, and low temperature hot water is supplied to the upper part of the hot water storage tank 11 to prevent the temperature of the hot water existing in the upper part of the hot water storage tank 11 from being lowered. Then, after the temperature of the hot water passing through the heat exchanger 35 rises to the set temperature Q, the second three-way valve 39 enters a state in which hot water is sent to the upper part of the hot water storage tank 11.

The control device 16 is constituted by, for example, a microcomputer, can detect the temperature measured by the first and second temperature sensors 14 and 15, and the remaining hot water of the bathtub 12 flows from the water flow sensor 33 to the bathtub circuit 30. The first, second, and third pumps 25, 32, and 36, and the first and second three-way valves 20, 39, the mixing valve 26, and the on-off valve 27. A program for controlling the operation is stored.

Further, the control device 16 is provided with a reheating function for heating the hot water in the bathtub 12 with the hot water discharged from the hot water outlet 22 of the hot water storage tank 11. When the reheating function is activated, the control device 16 operates the second pump 32 to flow the hot water of the bathtub 12 through the bathtub circuit 30, and the hot water from the hot water outlet 22 passes through the first three-way valve 20. And the first pump 25 is operated. The hot water sent out from the bathtub 12 is heated by the hot water discharged from the hot water outlet 22 of the hot water storage tank 11 by the heat exchanger 13 and returns to the bathtub 12, and the temperature of the hot water in the bathtub 12 rises.
And the control apparatus 16 stops the operation | movement of a chasing function when the temperature of the hot water of the bathtub 12 reaches to predetermined temperature. The first three-way valve 20 is in a state where hot water from the hot water outlet 22 flows into the heat exchanger 13 only when the reheating function is activated, and hot water from the water outlet 19 is heated at other times. It is in the state which flows into the exchanger 13.

Furthermore, the control device 16 heat-recovers the hot water sent from the water outlet 19 of the hot water storage tank 11 using the remaining hot water in the bathtub 12 as a heat source under a predetermined condition (heat recovery of the remaining hot water in the bathtub 12). A function is provided.
The control device 16 detects an operation for requesting the start of heat recovery on the operation panel 41, that is, a heat recovery start input by a signal received from the operation panel 41 connected to the control device 16 as a signal, and a heat recovery function Is brought into a heat recovery executable state in which heat recovery can be performed. In addition, it is also possible to change the heat recovery function in the heat recovery executable state to the heat recovery executable disabled state without performing heat recovery by the operation on the operation panel 41.

Further, the control device 16 (1) measures the temperature X1 of the hot water in the lower part of the hot water storage tank 11 by the first temperature sensor 14 when the heat recovery start input is received, and determines the temperature Y1 of the remaining hot water in the bathtub 12. Means A (not shown) measured by the second temperature sensor 15, and (2) the hot water in the hot water storage tank 11 is sent to the heat exchanger 13 on condition that the temperature Y1 is higher than the temperature X1 by a preset temperature T1. The means B (not shown) for recovering the heat of the remaining hot water in the bathtub 12 by the heat exchanger 13 and (3) the temperature X2 measured by the first temperature sensor 14 when the heat recovery of the remaining hot water in the bathtub 12 is completed. (4) After recording the temperature X2 by means C (4), the temperature measured by the first temperature sensor 14 is set to a temperature X3 lower than the temperature X2 minus the preset temperature T2. Means D for measuring the temperature Y2 of the remaining hot water in the bathtub 12 by the second temperature sensor 15, and (5) when the temperature Y2 is higher than the temperature X3 by a set temperature T1 or more, 12 and means E (not shown) for recovering heat of the remaining 12 hot water. In addition, as temperature T1 and T2, the temperature of the range of 5-9 degreeC (deg), for example, 7 degreeC is set to T1, and 5 degreeC is set to T2.

As shown in FIG. 2, when there is a heat recovery start input on the operation panel 41, the control device 16 receives a signal from the operation panel 41 and detects that there is a heat recovery start input. Is brought into a heat recovery executable state (step S1).
Then, the means A of the control device 16 measures the temperature X1 of the hot water in the lower part of the hot water storage tank 11 by the first temperature sensor 14 and operates the second pump 32 so that the remaining hot water of the bathtub 12 is supplied to the bathtub circuit 30. The temperature Y1 of the remaining hot water in the bathtub 12 is measured by the second temperature sensor 15 (step S2).

Next, the means B of the control device 16 detects whether the temperature Y1 is higher than the temperature X1 by a preset temperature T1 (Y1-X1 ≧ T1) or not (Y1-X1 <T1) (step S3). When Y1-X1 <T1 (for example, when Y1, X1, and T1 are 38 ° C., 31 ° C., and 7 ° C., respectively), the operation of the second pump 32 is stopped and the heat recovery function cannot be executed. (Step S4).

The means B of the control device 16 operates the first pump 25 when Y1−X1 ≧ T1 is detected in step S3 (for example, when Y1, X1, and T1 are 41 ° C., 25 ° C., and 7 ° C., respectively). Then, hot water is sent from the outlet 19 of the hot water storage tank 11 to the heat exchanger 13, and the hot water sent from the outlet 19 is heated by the heat of the remaining hot water in the bathtub 12 by the heat exchanger 13 to the hot water inlet 24 of the hot water storage tank 11. The heat recovery of the remaining hot water in the bathtub 12 is performed (step S5). Further, the means B of the control device 16 has a temperature difference between the temperature of the hot water in the lower part of the hot water storage tank 11 measured by the first temperature sensor 14 and the temperature of the remaining hot water in the bathtub 12 measured by the second temperature sensor 15 in advance. When the temperature becomes lower than the set temperature Tm, the first and second pumps 25 and 32 are stopped, and the heat recovery started in step S5 is ended. And the control apparatus 16 can perform the heat recovery of the remaining hot water of the bathtub 12 on a specific condition, without a new heat recovery start input, when the heat recovery by the means B is complete | finished. It will be in a standby state. The specific conditions are shown in the following means C to E, for example.

As the set temperature Tm, a temperature at which the heat exchanger 13 can stably heat the hot water sent from the water outlet 19 by the remaining hot water in the bathtub 12 is set, and this temperature depends on the performance of the heat exchanger 13. It is determined. Further, since the set temperature Tm is lower than the set temperature T1 (for example, in the range of 3 to 7 ° C), if the set temperature T1 is set to 7 ° C, the set temperature Tm is set to 5 ° C, for example. The
And the means C of the control apparatus 16 records the temperature X2 (for example, 30 degreeC) of the hot water of the hot water storage tank 11 lower measured by the 1st temperature sensor 14 at the time of heat recovery complete | finished (step S6).

When the means D of the control device 16 detects that the temperature measured by the first temperature sensor 14 has become a temperature X3 lower than the temperature X2 recorded by the means C in step S6 minus the set temperature T2 ( For example, when X2, T2, and X3 are 30 ° C., 5 ° C., and 24 ° C., respectively, the second pump 32 is operated to flow the remaining hot water of the bathtub 12 into the bathtub circuit 30, and the second temperature sensor 15 The temperature Y2 of 12 remaining hot water is measured (step S7).
Next, the means E of the control device 16 detects whether or not the temperature Y2 is higher than the temperature X3 by the set temperature T1 (Y2-X3 ≧ T1) or not (Y2-X3 <T1) (step S8), and Y2- When X3 <T1 (for example, when Y2, X3, and T1 are 28 ° C., 24 ° C., and 7 ° C., respectively), the second pump 32 is stopped and the heat recovery function is disabled (step S9). ).

The means E of the control device 16 operates the first pump 25 when Y2−X3 ≧ T1 is detected in step S8 (for example, when Y2, X3, and T1 are 32 ° C., 24 ° C., and 7 ° C., respectively). Then, hot water is sent from the outlet 19 of the hot water storage tank 11 to the heat exchanger 13, and the hot water sent from the outlet 19 is heated by the heat of the remaining hot water in the bathtub 12 by the heat exchanger 13 to the hot water inlet 24 of the hot water storage tank 11. The heat recovery of the remaining hot water in the bathtub 12 is performed (step S10). The means E of the control device 16 is a temperature difference between the temperature of the hot water in the lower part of the hot water storage tank 11 measured by the first temperature sensor 14 and the temperature of the remaining hot water in the bathtub 12 measured by the second temperature sensor 15. When the temperature becomes lower than the set temperature Tm, the first and second pumps 25 and 32 are stopped, and the heat recovery started in step S10 is terminated.

The control device 16 is provided with a control function having a setting α that forcibly sets the heat recovery function to the heat recovery disabled state when the heat recovery started in step S10 is completed.
The control device 16 detects whether or not the setting α is set when the heat recovery started in step S10 is completed (step S11), and if the setting α is set, the heat recovery function. In a state where heat recovery cannot be performed (step S12).
On the other hand, if the control device 16 detects that the setting α is not set in step S11, the control device 16 performs step S6 without making the heat recovery function incapable of executing heat recovery at that time, and Y2 in step S8. Steps S6 to S8 and Step S10 are repeated until -X3 <T1 is detected. Note that when the control device 16 detects Y2-X3 <T1 in step S8, the control device 16 disables the heat recovery function in step S9.

In addition, when the control device 16 detects that the elapsed time from the heat recovery start input has reached a preset time P (for example, a range of 1 to 3 hours), a new heat recovery start input is subsequently input. There is a means G (not shown) for not starting heat recovery of the remaining hot water in the bathtub 12 until there is.
To be exact, the means G detects that the set time P has elapsed from the heat recovery start input while the heat recovery is being performed by the means B or means E of the control device 16 in step S5 or step S10. When the heat recovery is completed, the first and second pumps 25 and 32 are stopped to make the heat recovery function incapable of executing heat recovery, and the passage of the set time P is detected. If the heat recovery by is not performed, the heat recovery function is immediately disabled to the heat recovery execution disabled state. The control device 16 is provided with a setting β in which the setting time P is set. If there is no value set in the setting β, the means G does not measure the elapsed time from the heat recovery start input. The heat recovery function does not cause the heat recovery function to be disabled by the means G.

Furthermore, the control device 16 records the minimum temperature Xb of the hot water in the lower part of the hot water storage tank 11 measured and detected by the first temperature sensor 14 after the heating means 21 finishes heating the hot water in the hot water storage tank 11, and the control device 16 The temperature of the remaining hot water in the bathtub 12 at the time when the heat recovery by the means B or means E of 16 is completed is added to the preset temperature T3 (for example, a temperature in the range of 5 to 9 ° C.) by adding the minimum temperature Xb. When the temperature is lower than the above temperature, there is a means H (not shown) that makes the heat recovery execution impossible state that does not start the heat recovery of the remaining hot water in the bathtub 12. The minimum temperature Xb recorded by the means H is once erased when heating of the hot water storage tank 11 by the heating means 21 is started, and the means H is stored in the hot water storage tank 11 from the time when heating by the heating means 21 is completed. Detection and recording of the minimum temperature Xb of the inner and lower hot water is started again.

Here, the control device 16 is provided with a setting γ for setting whether or not to operate the means H. When the setting γ is set not to operate the means H, the means H The minimum temperature Xb is not recorded, and the heat recovery function is not disabled by the means H.
Moreover, the control apparatus 16 attaches the feed water temperature sensor which measures the temperature of tap water to the water pipe 17 instead of using the 1st temperature sensor 14 for measurement of the minimum temperature Xb, and uses the feed water temperature sensor to set the minimum temperature Xb. It can also be measured and recorded.

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, the control device may generate the heat recovery start input at a preset time instead of detecting that the heat recovery start input has been received by a signal received from the operation panel.
Further, instead of providing a heating means for heating the hot water in the hot water storage tank outside the hot water storage tank, a heat source device arranged in the hot water storage tank may be provided to heat the hot water in the hot water storage tank.

10: heat recovery system, 11: hot water storage tank, 12: bathtub, 13: heat exchanger, 14: first temperature sensor, 15: second temperature sensor, 16: control device, 17: water pipe, 18: water Water inlet, 19: outlet, 20: first three-way valve, 21: heating means, 22: outlet, 24: inlet, 25: first pump, 26: mixing valve, 27: on-off valve, 28: Check valve, 30: Bath circuit, 32: Second pump, 33: Water flow sensor, 34: Water intake port, 35: Heat exchanger, 36: Third pump, 37: Heat medium circulation circuit, 38: Heat pump type Heat source device, 39: second three-way valve, 40: bypass pipe, 41: operation panel

Claims (4)

A hot water storage tank for storing hot water,
A heat exchanger that heats the hot water in the hot water storage tank using the remaining hot water in the bathtub as a heat source, and recovers the heat of the remaining hot water in the bathtub;
A first temperature sensor for measuring the temperature of hot water in the lower part of the hot water storage tank;
A second temperature sensor for measuring the temperature of the remaining hot water in the bathtub;
A controller for detecting the temperature measured by the first temperature sensor and the second temperature sensor and recovering heat of the remaining hot water in the bathtub,
The control device includes:
(1) When there is a heat recovery start input, the temperature X1 of the hot water in the lower part of the hot water storage tank is measured by the first temperature sensor, and the temperature Y1 of the remaining hot water in the bathtub is measured by the second temperature sensor. Means A for measuring;
(2) On condition that the temperature Y1 is higher than the temperature X1 by a preset temperature T1, the hot water in the hot water storage tank is sent to the heat exchanger, and the heat exchanger heats the remaining hot water in the bathtub. And means B for collecting,
In addition, when the heat recovery by the means B is completed, the control device can automatically perform heat recovery of the remaining hot water of the bathtub under specific conditions without a new heat recovery start input. A heat recovery system characterized by being in a standby state. The heat recovery system according to claim 1, wherein the control device includes:
(1) means C for recording the temperature X2 measured by the first temperature sensor when the heat recovery of the remaining hot water in the bathtub by the means B is completed;
(2) Thereafter, when it is detected that the temperature measured by the first temperature sensor has become a temperature X3 lower than a temperature obtained by subtracting a preset set temperature T2 from the temperature X2, the temperature of the remaining hot water in the bathtub Means D for measuring Y2 by the second temperature sensor;
(3) A heat recovery system comprising means E for performing heat recovery of the remaining hot water in the bathtub when the temperature Y2 is higher than the set temperature T1 by comparison with the temperature X3. 3. The heat recovery system according to claim 1, wherein when the controller detects that an elapsed time from a heat recovery start input has reached a preset time P, the bath A heat recovery system comprising means G for not starting the heat recovery of the remaining hot water. 3. The heat recovery system according to claim 2, further comprising heating means for heating the hot water in the hot water storage tank, wherein the control device detects the lower part of the hot water tank detected after the heating means finishes heating the hot water in the hot water storage tank. The minimum temperature Xb of the hot water is recorded, and the temperature of the remaining hot water in the bath at the time when the heat recovery by the means B or E is completed is obtained by adding the minimum temperature Xb to a preset set temperature T3. When the temperature is lower than the temperature, the heat recovery system includes means H for not starting the heat recovery of the remaining hot water in the bathtub.

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