JP2017075778A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater capable of improving energy saving performance while keeping usability.SOLUTION: A storage type water heater 35 includes mixing means for adjusting a temperature of hot water supplied to a hot water supply pipe, flow rate adjustment means for adjusting a supply flow rate of hot water flowing in the hot water supply pipe, and control means 36, and further includes at least three of four modes, that is, a fixed amount/fixed temperature mode for making both of the hot water supply flow rate and the hot water supply temperature temporally fixed, a variable amount/fixed temperature mode for temporally changing the hot water supply flow rate and making the hot water supply temperature temporally fixed, a fixed amount/variable temperature mode for making the hot water supply flow rate temporally fixed and temporally changing the hot water supply temperature, and a variable amount/variable temperature mode for temporally changing the hot water supply flow rate and temporally changing the hot water supply temperature. The control means 36 periodically changes the hot water supply flow rate while applying an initial flow rate as an upper limit and a flow rate lower than the initial flow rate as a lower limit in both or one of the variable amount/fixed temperature mode and the variable amount/variable temperature mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water storage type water heater.

  For example, there is a hot water storage water heater that stores hot water boiled by a heating means such as a heat pump in a hot water storage tank and uses the hot water taken out of the hot water storage tank to supply hot water to a hot water supply destination such as a bathtub, a shower, a kitchen, and a faucet in a bathroom. Widely used.

  Patent Document 1 discloses a water heater that saves water and saves energy by periodically changing the flow rate of hot water to the shower.

JP 2011-252684 A

  As in the technique disclosed in Patent Document 1, there is a case where a water saving effect and an energy saving effect are caused by changing the hot water flow rate to the shower and periodically reducing the flow rate. However, when the flow rate of the shower is periodically decreased, the rinsing performance may be decreased and it may be difficult to use. In addition, the necessary rinsing time becomes long, and it is considered that sufficient water saving effect and energy saving effect cannot be obtained.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hot water storage type hot water heater capable of improving energy saving while maintaining ease of use.

  The hot water storage type water heater according to the present invention mixes a hot water storage tank for storing hot water, a hot water supply pipe, hot water supplied from the hot water storage tank, and water supplied from a water source, so that the temperature of the hot water flowing through the hot water supply pipe is A mixing means for adjusting the hot water supply temperature, a flow rate adjusting means for adjusting the flow rate of hot water flowing through the hot water supply pipe, and a control means for controlling the operation of the mixing means and the flow rate adjusting means. And constant temperature mode that makes both the hot water temperature and time constant, and a variable and constant temperature mode that changes the hot water flow rate over time and the hot water temperature constant over time, and the hot water flow rate constant over time And a variable / temperature change mode in which the hot water temperature is changed over time and a variable amount / temperature change mode in which the hot water flow rate is changed over time and the hot water temperature is changed over time. There are at least three modes, and the control means has a function of switching each mode, and the control means sets the initial flow rate as the upper limit in the variable / constant temperature mode and / or the variable / temperature change mode. In contrast, the lower flow rate is set as the lower limit, and the hot water supply flow rate is periodically changed between them.

  According to the present invention, energy saving can be improved while maintaining ease of use.

It is a block diagram which shows the hot water storage type water heater of Embodiment 1 of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot-water storage type water heater according to Embodiment 1 of the present invention. As shown in FIG. 1, a hot water storage type water heater 35 according to the first embodiment includes a tank unit 33, an HP (heat pump) unit 7 that uses a heat pump cycle, and a user who performs an operation to change an operation command or a set value. And a remote control device 44 as an interface device. The HP unit 7 and the tank unit 33 are connected to each other via an HP outgoing pipe 14, an HP return pipe 15, and electrical wiring (not shown).

  The tank unit 33 includes a control means 36. The operations of various valves, pumps and the like provided in the tank unit 33 and the HP unit 7 are controlled by a control means 36 electrically connected thereto. The control means 36 and the remote control device 44 are connected so that they can communicate with each other. Although not shown in the drawings, the remote control device 44 includes a display unit that displays information such as the state of the hot water storage water heater 35, an operation unit such as a switch operated by a user, a speaker, a microphone, and the like.

  The HP unit 7 functions as a heating means for heating the low-temperature water led from the hot water storage tank 8 provided in the tank unit 33. The HP unit 7 connects the compressor 1, the water refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 6 in a ring shape with a refrigerant pipe 5 to constitute a heat pump cycle. The water-refrigerant heat exchanger 3 is for exchanging heat between the refrigerant flowing through the refrigerant pipe 5 and the low-temperature water led from the tank unit 33.

  The tank unit 33 incorporates the following various parts and piping. The hot water storage tank 8 stores hot water. A third water supply pipe 9 c is connected to a water inlet 8 a provided at the lower part of the hot water storage tank 8. Low-temperature water supplied from a water source such as water supply is adjusted to a predetermined pressure by the pressure reducing valve 31 and then flows into the hot water storage tank 8 through the third water supply pipe 9c. A hot water supply pipe 21 for taking out hot water stored in the hot water storage tank 8 and a hot water supply pipe 13 are connected to the hot water introduction outlet 8 d provided in the upper part of the hot water storage tank 8. Hot water heated using the HP unit 7 flows into the hot water storage tank 8 from the hot water introduction outlet 8d, and low temperature water from the third water supply pipe 9c flows from the water introduction port 8a. In the hot water storage tank 8, hot water is stored by forming a temperature stratification in which the upper side is hot and the lower side is low. A plurality of hot water storage temperature sensors 42 and 43 are attached to the surface of the hot water storage tank 8 at different heights. By detecting the temperature distribution of the hot water in the hot water storage tank 8 with these hot water storage temperature sensors 42 and 43, the amount of remaining hot water or the amount of heat storage in the hot water storage tank 8 is grasped. The control means 36 controls the start and stop of the boiling operation in which hot water is generated by the HP unit 7 and stored in the hot water storage tank 8 based on the amount of remaining hot water or the amount of heat stored.

  In the tank unit 33, the heat source pump 12 and the use side heat exchanger 20 are built. The heat source pump 12 is a pump for circulating hot water through various pipes to be described later in the tank unit 33, and is provided on the HP outgoing pipe 14. The use-side heat exchanger 20 is a heat exchanger for heating secondary heating target water (tub water, heating water, etc.) using hot water supplied from the hot water storage tank 8 or the HP unit 7. . In the present embodiment, as the secondary side configuration of the use-side heat exchanger 20, a bath piping 27 and a bath return piping 28 for circulating the bath water led out from the bath 30 will be exemplified and described. The use side heat exchanger 20 is installed in the middle of a circulation path formed by the forward piping 27, the return piping 28, and the bathtub 30. Further, a bath circulation pump 29 for circulating bath water and a bath return temperature sensor 38 for detecting the temperature of bath water discharged from the bath 30 are installed in the middle of the bath return pipe 28. In the middle of the bath piping 27, a bath temperature sensor 37 for detecting the temperature of the hot water after the heat exchange from the use side heat exchanger 20 is installed.

  The three-way valve 11 is a flow path switching means having an a port and a b port as inflow ports and a c port as an outflow port. The four-way valve 18 is a flow path switching means having b and c ports that are inflow ports and a and d ports that are outflow ports. The four-way valve 18 is configured to be able to switch the flow path among four paths, ab, ac, bd, and cd. The tank unit 33 includes a water outlet port pipe 10, a hot water introduction pipe 20 a, a first bypass pipe 16, a hot water outlet pipe 20 b, and a second bypass pipe 17. The water outlet port pipe 10 connects a water outlet 8 b provided at the lower part of the hot water storage tank 8 and the a port of the three-way valve 11. The HP forward piping 14 connects the c port of the three-way valve 11 and the inlet side of the HP unit 7. The HP return pipe 15 connects the outlet side of the HP unit 7 and the c port of the four-way valve 18. The hot water supply pipe 13 connects the d port of the four-way valve 18 and the hot water introduction outlet 8 d above the hot water storage tank 8. The first bypass pipe 16 connects the a port of the four-way valve 18 and a hot water inlet 8 c provided between the central part and the lower part of the hot water storage tank 8. The hot water introduction pipe 20 a branches off from the middle of the hot water supply pipe 13 and is connected to the primary side inlet of the use side heat exchanger 20. The hot water outlet pipe 20 b connects the primary side outlet of the use side heat exchanger 20 and the b port of the three-way valve 11. The second bypass pipe 17 branches from between the heat source pump 12 in the HP outgoing pipe 14 and the inlet side of the HP unit 7 and is connected to the b port of the four-way valve 18.

  Further, the tank unit 33 includes a first water supply pipe 9a, a second water supply pipe 9b, a hot water supply mixing valve 22, a bath mixing valve 23, a first hot water supply pipe 24, a second hot water supply pipe 25, and a flow rate adjustment valve 40. doing. One end of the first water supply pipe 9a is connected to a water source such as a water supply, and the other end of the first water supply pipe 9a is connected to the second water supply pipe 9b and the third water supply pipe 9c via the pressure reducing valve 31, thereby supplying water. A conduit 9 is configured. The second water supply pipe 9 b is branched from the middle and connected to one of the two inlets of the hot water supply mixing valve 22 and one of the two inlets of the bath mixing valve 23. The other end side of the hot water supply pipe 21 whose one end is connected to the upper part of the hot water storage tank 8 branches off from the middle, and the other of the two inlets of the hot water mixing valve 22 and the two of the bath mixing valves 23. Each is connected to the other of the inlets.

  The hot water mixing valve 22 corresponds to a mixing means having a function of changing a mixing ratio of hot water supplied from the hot water storage tank 8 through the hot water supply pipe 21 and low temperature water supplied from the second water supply pipe 9b. The outlet of the hot water supply mixing valve 22 is connected to one end of the first hot water supply pipe 24. The other end of the first hot water supply pipe 24 is connected to a hot water tap 34. Hot water supplied from the hot water supply mixing valve 22 to the first hot water supply pipe 24 is further passed through a hot water tap 34 and an external pipe (not shown) connected to the hot water tap 34, It is sent to a faucet (not shown) such as Karan.

  The bath mixing valve 23 has a function of changing the mixing ratio of hot water supplied from the hot water storage tank 8 through the hot water supply pipe 21 and low temperature water supplied from the second water supply pipe 9b. The outlet of the basin mixing valve 23 is connected to one end of the second hot water supply pipe 25. In the middle of the second hot water supply pipe 25, there are provided a solenoid valve 26 for opening and closing the second hot water supply pipe 25, and a flow sensor 45 for detecting the flow of hot water passing through the second hot water supply pipe 25. The hot water supplied from the bath mixing valve 23 to the second hot water supply pipe 25 flows into the bathtub 30 through the bath forward pipe 27 and the bath return pipe 28.

  The flow rate adjustment valve 40 is provided in the middle of the first hot water supply pipe 24. The flow rate adjustment valve 40 is operable to change the flow path cross-sectional area, and corresponds to a flow rate adjustment unit having a function of adjusting the flow rate of hot water flowing through the first hot water supply pipe 24. A hot water supply temperature sensor 39 that detects the temperature of hot water flowing through the first hot water supply pipe 24 is provided on the upstream side of the flow rate adjustment valve 40 of the first hot water supply pipe 24. A flow rate sensor 41 that detects the flow rate of hot water flowing through the first hot water supply pipe 24 is provided on the downstream side of the flow rate adjustment valve 40 of the first hot water supply pipe 24. In the following description, the flow rate of hot water flowing through the first hot water supply pipe 24 is simply referred to as “hot water supply flow rate”, and the temperature of hot water flowing through the first hot water supply pipe 24 is simply referred to as “hot water supply temperature”.

  The three-way valve 11 has two flow path forms, a form in which the water outlet pipe 10 and the HP outgoing pipe 14 communicate with each other, and a form in which the hot water outlet pipe 20b and the HP outgoing pipe 14 communicate with each other. Switch the hot water flow path. The four-way valve 18 includes a form in which the HP return pipe 15 and the hot water supply pipe 13 communicate with each other, a form in which the HP return pipe 15 and the first bypass pipe 16 communicate with each other, a first bypass pipe 16 and a second bypass pipe 17. Are connected to the hot water supply pipe 13 and the second bypass pipe 17 are connected to each other, and the flow path of the hot water in the tank unit 33 is switched for use.

  Next, the operation of the hot water storage type water heater 35 of the first embodiment will be described. The hot water storage type water heater 35 according to the first embodiment has a fixed quantity / constant temperature mode, a variable quantity / constant temperature mode, a fixed quantity / temperature change mode, and a variable quantity / temperature change mode as hot water supply modes to the first hot water supply pipe 24. And the control means 36 can switch between these hot water supply modes.

  The fixed amount / constant temperature mode is a normal hot water supply mode in which both the hot water supply flow rate and the hot water supply temperature are made constant over time. In the fixed quantity / constant temperature mode, the control means 36 uses the temperature set by the user with the remote controller 44 as a target temperature, and the hot water supply temperature detected by the hot water supply temperature sensor 39 matches the target temperature. The mixing ratio is adjusted and feedback control is performed. In the fixed quantity / constant temperature mode, the control means 36 stops the operation of the flow rate adjustment valve 40 and keeps the hot water supply flow rate constant over time.

  The variable amount / constant temperature mode is a hot water supply mode in which the hot water supply flow rate is changed over time and the hot water supply temperature is made constant over time. The fixed amount / temperature change mode is a hot water supply mode in which the hot water supply flow rate is made constant over time and the hot water supply temperature is changed over time. The variable amount / temperature change mode is a hot water supply mode in which the hot water supply flow rate is changed over time and the hot water supply temperature is also changed over time. According to these three hot water supply modes, an energy saving effect can be achieved. It gives energy saving effect by giving fluctuation (temporal fluctuation) to the hot water temperature during hot water supply and suppressing the total amount of discharged hot water compared with the quantitative / constant temperature mode. Moreover, the actual hot water supply amount per unit time can be reduced by periodically changing the hot water supply flow rate, and an energy saving effect is exhibited. In general, human thermal sensation tends to be insensitive when in a constant temperature state, but by giving a certain level of temperature fluctuation, there is an effect of obtaining thermal sensation. Further, the water pressure (pressure sensation) felt by humans in a shower or the like tends to become insensitive when in a certain state, but there is an effect that pressure sensation can be obtained by giving a certain degree of water pressure (pressure sensation) fluctuation. In the three hot water supply modes described above, by using such an effect, it is possible to improve energy saving while maintaining ease of use. The user operates one of the four hot water supply modes including the fixed-quantity / constant temperature mode by operating an operation unit (not shown) of the remote control device 44 when the hot water is discharged from a shower or a currant. Can be selected arbitrarily. Hereinafter, the operation of each mode that provides the energy saving effect will be described.

  First, the variable / constant temperature mode will be described. In the variable amount / constant temperature mode, the control means 36 adjusts the mixing ratio of the hot water mixing valve 22 so that the hot water temperature detected by the hot water temperature sensor 39 matches the target temperature, and performs feedback control. Further, in the variable amount / constant temperature mode, the control means 36 performs control so that the flow rate adjustment valve 40 is repeatedly operated during hot water discharge so that the hot water supply flow rate periodically varies. For example, the control means 36 sets the initial flow rate detected by the flow sensor 41 as an upper limit, sets the flow rate lower by about 10% than the initial flow rate as the lower limit, and changes the hot water supply flow rate at a frequency of, for example, several hertz. According to such a variable amount / constant temperature mode, it is possible to reduce the actual amount of discharged hot water by an amount corresponding to the periodic adjustment of the hot water supply flow rate in the lower limit direction, compared with the case where the hot water supply flow rate is not changed. For this reason, the energy saving effect by reduction of the absolute amount of hot water used can be acquired.

  Next, the quantitative / variable temperature mode will be described. In the fixed amount / temperature change mode, the control means 36 stops the operation of the flow rate adjustment valve 40 and makes the hot water supply flow rate constant over time. Further, in the fixed amount / temperature change mode, the control means 36 feedback-controls the mixing ratio of the hot water supply mixing valve 22 during tapping, but operates by repeatedly changing the mixing ratio of the hot water mixing valve 22. The hot water supply temperature is changed over time. In the fixed amount / variable temperature mode, the control means 36, for example, rises from the state where the hot water supply temperature is equal to the target temperature in the fixed amount / constant temperature mode to a temperature several degrees lower than the target temperature and then increases to the target temperature. The hot water supply mixing valve 22 is repeatedly operated so that the cycle is repeated at a cycle of, for example, about 10 seconds. Since the fluctuation range of the hot water supply temperature in the fixed amount / temperature change mode is about several degrees Celsius, it does not give unpleasant feeling to the user such as a shower. On the other hand, since the hot water supply temperature is periodically decreased as compared with the target temperature, less energy (the amount of hot water stored in the hot water storage tank 8 or the amount of stored heat) can be used. For this reason, according to fixed_quantity | variation / temperature-change mode, an energy saving effect is exhibited compared with fixed_quantity | quantitative_assay temperature mode. Further, in the fixed amount / temperature changing mode, the hot water flow rate is not periodically reduced, so that the rinsing performance of a shower or the like is not lowered. For this reason, according to fixed_quantity | variation and temperature change mode, the energy saving effect is acquired, maintaining the ease of use of a shower etc. reliably.

  Next, the variable / temperature change mode will be described. In the variable amount / temperature change mode, the control means 36 varies both the hot water supply flow rate and the hot water supply temperature with time by simultaneously performing the variable amount / constant temperature mode operation and the quantitative / temperature change mode operation. That is, in the variable amount / temperature changing mode, the control means 36 repeatedly operates the flow rate adjustment valve 40 so that the hot water supply flow rate periodically changes, and repeatedly changes the mixing ratio of the hot water supply mixing valve 22 to thereby change the hot water supply temperature. Is changed over time. According to the variable / temperature change mode, the effect of the variable / constant temperature mode and the effect of the quantitative / temperature change mode can be obtained at the same time, and a further energy saving effect can be exhibited. The fluctuation cycle of the hot water supply flow rate and the fluctuation cycle of the hot water supply temperature in the variable amount / temperature change mode may be different or the same.

  In the above description, the temperature fluctuation in the quantitative / variable temperature mode and the variable / variable temperature mode is varied between the target temperature in the quantitative / constant temperature mode and a lower temperature. The present invention is not limited to such a configuration, and in both or one of the quantitative / variable temperature mode and the variable / variable temperature mode, the hot water supply temperature is set to a temperature higher than the target temperature in the quantitative / constant temperature mode and a temperature lower than the target temperature. It may be configured to vary periodically between the two. According to such a structure, although a user will feel the fluctuation of the tapping temperature more, it does not immediately become uncomfortable and a further energy saving effect is exhibited. In this case, in one cycle of fluctuations in hot water supply temperature, the hot water supply time or hot water supply amount below the target temperature is controlled to be larger than the hot water supply time or hot water supply amount above the target temperature. Thereby, since the energy (the amount of hot water stored in the hot water storage tank 8 or the amount of heat stored) used for hot water supply is reliably reduced, the energy saving effect can be surely exhibited. In the present invention, the average temperature of hot water supplied to the first hot water supply pipe 24 is lower than the target temperature in the quantitative / constant temperature mode in one or both of the quantitative / variable temperature mode and the variable / variable temperature mode. You may control so that it may become. Here, the average temperature of the hot water supplied to the first hot water supply pipe 24 refers to the temperature when the hot water supplied to the first hot water supply pipe 24 is stored and mixed for a certain time (for example, 30 seconds). To do. By controlling in this way, the energy used for hot water supply (the amount of hot water stored in the hot water storage tank 8 or the amount of stored heat) is surely reduced, so that the energy saving effect can be reliably exhibited.

  In addition, even in either or one of the fixed amount / variable temperature mode and variable amount / variable temperature mode, even if the user can change the cycle or fluctuation range (temperature range) when the hot water supply temperature is changed periodically Good. For example, by operating the remote control device 44 by the user, it is possible to arbitrarily input a fluctuation period or fluctuation width value of the hot water supply temperature, or select from a plurality of values prepared in advance. Thereby, since the user can set the fluctuation cycle or fluctuation width of the hot water supply temperature to a desired size, the usability is further improved.

  Further, in both or one of the quantitative / variable temperature mode and the variable / variable temperature mode, the control means 36 prevents the hot water temperature from exceeding a predetermined upper limit temperature regardless of the hot water temperature set by the user using the remote control device 44. You may control to. For example, when the hot water supply temperature set by the user with the remote control device 44 is relatively high (eg, 48 ° C.) and the fluctuation range of the hot water supply temperature above the target temperature is set to 5 ° C. When the hot water supply temperature fluctuates upward, the maximum temperature reaches about 53 ° C., and the user may feel uncomfortable due to an unexpectedly high temperature. In such a case, the upper limit temperature of the hot water supply temperature is set to 50 ° C., for example, and the control means 36 does not exceed the upper limit temperature of 50 ° C. regardless of the hot water temperature set by the user with the remote control device 44. By controlling the temperature, the hot water supply temperature can be surely prevented from becoming a high temperature unexpected by the user, and the user's discomfort can be avoided.

  In both or one of the quantitative / variable temperature mode and the variable / variable temperature mode, the control means 36 prevents the hot water temperature from falling below a predetermined lower limit temperature regardless of the hot water temperature set by the user using the remote control device 44. You may control to. For example, when the hot water temperature set by the user with the remote control device 44 is relatively low (for example, 38 ° C.) and the fluctuation range of the hot water temperature to the lower side of the target temperature is set to 8 ° C. When the hot water supply temperature fluctuates downward, the minimum temperature is 30 ° C., and the user may feel uncomfortable due to an unexpected low temperature. In such a case, the lower limit temperature of the hot water supply temperature is set to 35 ° C., for example, and the control means 36 prevents the hot water supply temperature from falling below the lower limit temperature of 35 ° C. regardless of the hot water temperature set by the user with the remote control device 44. By controlling the temperature, the hot water supply temperature can be surely prevented from becoming a low temperature unexpected by the user, and the user's discomfort can be avoided.

  Further, in both or one of the quantitative / variable temperature mode and the variable / variable temperature mode, the control means 36 sets the hot water temperature fluctuation range and / or the fluctuation cycle of the hot water temperature by the user using the remote controller 44 ( It may be automatically changed according to the target temperature in the fixed quantity / constant temperature mode. In general, in a temperature range close to human body temperature (for example, 35 to 40 ° C.), a change in hot water supply temperature is relatively sensitive. Therefore, the control means 36 uses a predetermined temperature region (for example, 35 to 35) in which the hot water supply temperature set by the user with the remote control device 44 is close to the human body temperature in one or both of the quantitative / variable temperature mode and the variable / variable temperature mode. 40 ° C), change the fluctuation range of the hot water supply temperature to a smaller value or change the fluctuation cycle as compared to the case outside the temperature range (region above 40 ° C and region below 35 ° C). You may change to a larger value or both. Thereby, in the temperature range where a person is sensitive to fluctuations in the hot water temperature, it is possible to reliably suppress the user from feeling that the fluctuations in the hot water temperature are too large. For this reason, it becomes possible to demonstrate the energy saving effect, further improving usability.

  As described above, according to the first embodiment, as the hot water supply mode to the first hot water supply pipe 24, in addition to the fixed amount / constant temperature mode, the variable / constant temperature mode, the fixed amount / temperature change mode, the variable amount / temperature change. The mode can be selected. When any one of the variable / constant temperature mode, quantitative / temperature change mode, and variable / temperature change mode is selected, fluctuations in the hot water flow rate or hot water temperature during hot water supply will not affect the overall feeling of use. It is possible to perform hot water supply operation that suppresses the amount of heat discharged from the hot water as compared with the quantitative / constant temperature mode, and can exhibit an energy saving effect. Further, since the user can select the hot water supply mode according to each individual's preference, energy saving can be improved while maintaining ease of use. For example, a user who feels uncomfortable fluctuations in the hot water supply flow rate can use the quantitative / temperature change mode, and a user who feels uncomfortable fluctuations in the hot water supply temperature can use the variable amount / constant temperature mode. On the other hand, a user who does not feel uncomfortable in both the hot water supply temperature fluctuation and the hot water supply flow rate can use the variable amount / temperature change mode. In this way, the user can easily obtain an energy saving effect according to each individual's preference. In particular, the following effects can be obtained by switching to the quantification / temperature change mode. In the variable / constant temperature mode or the variable / temperature change mode, the hot water flow rate periodically decreases, so that the rinsing performance of a shower or the like slightly decreases. For this reason, when a shower or the like is used in the variable / constant temperature mode or the variable / temperature change mode, the user may prolong the rinsing time in order to compensate for the decrease in the rinsing performance. If the user increases the rinsing time when using the variable / constant temperature mode or the variable / temperature change mode, the energy saving effect may not be sufficiently exhibited. On the other hand, in the fixed amount / temperature change mode, the rinsing performance of the shower or the like does not deteriorate, so the user does not lengthen the rinsing time. Therefore, the energy saving effect can be surely exhibited by using the quantitative / temperature changing mode.

  In the first embodiment, the current hot water supply mode may be displayed on the display unit of remote control device 44. Thereby, a user can grasp | ascertain the present hot water supply mode easily, and there exists a useful effect in recognizing a user's favorite hot water supply mode, or grasping | ascertaining the difference by the change of hot water supply mode.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the structure mentioned above. For example, although the mixing means is constituted by the hot water supply mixing valve 22 in the first embodiment, the mixing means in the present invention is based on the high temperature water derived from the upper part of the hot water storage tank and the middle height of the hot water storage tank. The structure which has the 1st mixing part which mixes the derived | led-out intermediate temperature water, the 2nd mixing part which mixes the hot water mixed by this 1st mixing part, and the low temperature water supplied from a water source may be sufficient. In such a configuration, the hot water supply temperature may be changed by changing the mixing ratio of the first mixing unit in the quantitative / temperature changing mode or the variable / temperature changing mode, or the mixing ratio of the second mixing unit may be changed. The hot water supply temperature may be changed by changing the temperature. Further, at least three of the four modes described above may be provided and can be switched by the remote control device 44.

DESCRIPTION OF SYMBOLS 1 Compressor, 3 Water refrigerant | coolant heat exchanger, 4 Expansion valve, 5 Refrigerant piping, 6 Air heat exchanger, 7 HP unit, 8 Hot water storage tank, 8a Water inlet, 8b Water outlet, 8c Hot water inlet, 8d Hot water Inlet / outlet, 9 water supply pipe, 9a 1st water supply pipe, 9b 2nd water supply pipe, 9c 3rd water supply pipe, 10 water outlet pipe, 11 three-way valve, 12 heat source pump, 13 hot water supply pipe, 14 HP outgoing pipe, 15 HP return pipe, 16 first bypass pipe, 17 second bypass pipe, 18 four-way valve, 20 utilization side heat exchanger, 20a hot water introduction pipe, 20b hot water outlet pipe, 21 hot water supply pipe, 22 hot water mixing valve, 23 Mixing valve for bath, 24 1st hot water supply piping, 25 2nd hot water piping, 26 Solenoid valve for bathing, 27 Bathing piping, 28 Bath returning piping, 29 Bath circulating pump, 30 Bathtub, 31 Pressure reducing valve , 33 Tank unit, 34 Hot water tap, 35 Hot water storage type water heater, 36 Control means, 37 Flowing temperature sensor, 38 Flow return temperature sensor, 39 Hot water temperature sensor, 40 Flow rate adjustment valve, 41 Flow rate sensor, 42, 43 Hot water storage temperature Sensor, 44 Remote control device, 45 Flow sensor for bath

Claims (9)

A hot water storage tank for storing hot water,
Hot water supply piping,
Mixing means for adjusting hot water temperature, which is the temperature of hot water flowing through the hot water supply pipe, by mixing hot water supplied from the hot water storage tank and water supplied from a water source;
A flow rate adjusting means for adjusting a hot water supply flow rate that is a flow rate of hot water flowing through the hot water supply pipe;
Control means for controlling operations of the mixing means and the flow rate adjusting means;
With
Quantitative / constant temperature mode in which both the hot water flow rate and the hot water temperature are constant over time,
A variable amount / constant temperature mode in which the hot water supply flow rate is changed over time and the hot water supply temperature is made constant over time,
Quantitative / temperature change mode in which the hot water flow rate is made constant over time and the hot water supply temperature is changed over time;
A variable amount / temperature change mode in which the hot water flow rate is changed over time and the hot water supply temperature is changed over time,
Comprising at least three of the four modes, and the control means has a function of switching between the modes,
The control means sets an initial flow rate as an upper limit in both or one of the variable / constant temperature mode and the variable / temperature change mode, sets a lower flow rate as a lower limit to the initial flow rate, and periodically changes the hot water supply flow rate therebetween. Fluctuating hot water storage water heater.   The control means is configured to compare an average temperature of hot water supplied to the hot water supply pipe in both or one of the quantitative / variable temperature mode and the variable / variable temperature mode with respect to a target temperature in the quantitative / constant temperature mode, The hot water storage type water heater according to claim 1, wherein the hot water heater is lowered.   The hot water storage type hot water heater according to claim 1 or 2, wherein a user can change both or one of a fluctuation cycle and a fluctuation range of the hot water supply temperature in both or one of the quantitative / variable temperature mode and the variable / variable temperature mode. .   The control means sets the hot water supply temperature between a target temperature in the fixed amount / constant temperature mode and a temperature lower than the target temperature in one or both of the fixed amount / variable temperature mode and the variable amount / variable temperature mode. The hot water storage type hot water supply device according to any one of claims 1 to 3, wherein the hot water storage type water heater is periodically changed.   The control means is configured to compare the hot water supply temperature to a temperature higher than the target temperature in the fixed amount / constant temperature mode and the target temperature in one or both of the fixed amount / temperature change mode and the variable amount / temperature change mode. The hot water supply time or hot water supply amount below the target temperature is compared with the hot water supply time or hot water supply amount above the target temperature in one cycle. The hot water storage type hot water supply device according to any one of claims 1 to 3, wherein the hot water storage type water heater is increased.   The control means prevents the hot water supply temperature from going out of the upper limit temperature or the lower limit temperature regardless of the temperature set by the user in one or both of the quantitative / variable temperature mode and the variable / variable temperature mode. The hot water storage type water heater according to any one of claims 1 to 5, which is controlled.   The control means changes both or one of the fluctuation cycle and fluctuation width of the hot water supply temperature based on the temperature set by the user in both or one of the quantitative / temperature change mode and the variable quantity / temperature change mode. The hot water storage type water heater according to any one of claims 1 to 6.   When the temperature set by the user is within a predetermined temperature range close to human body temperature in either or one of the quantitative / temperature change mode and the variable / temperature change mode, the control means The hot water storage type hot water supply device according to any one of claims 1 to 6, wherein a fluctuation cycle of the hot water supply temperature is increased or a fluctuation range of the hot water supply temperature is reduced as compared with a case where the hot water supply temperature is outside the region. A remote control device having a display unit that is communicably connected to the control means and displays information on the state of the hot water storage type water heater;
The hot water storage type hot water heater according to any one of claims 1 to 8, wherein the display unit of the remote control device displays a current hot water supply mode.

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