JP2012017918A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater which is excellent in usability and energy saving.SOLUTION: The water heater includes: a first tapping pipe 3, a second tapping pipe 4, and a water supply pipe 18 connected to the upper part, intermediate part, and lower part of a hot water storage tank 1, respectively; a first three-way valve 20 whose inlet side is connected to the first tapping pipe 3 and a water supply branch pipe 19 branching from the water supply pipe 18 while outlet side is connected to a first mixing valve water inlet pipe 23; a second three-way valve 22 whose inlet side is connected to the second tapping pipe 4 and a first tapping pipe branch pipe 21 branching from the first tapping pipe 3 while the outlet side is connected to a second mixing valve water inlet pipe 24; a mixing valve 25 whose inlet side is connected to the first mixing valve water inlet pipe 23 and the second mixing valve water inlet pipe 24 while the outlet side is connected to a hot water supply pipe 26; a hot water supply opening 27 connected to the hot water supply pipe 26; a hot water temperature detecting unit 33 for detecting the hot water temperature at such portion of the hot water storage tank 1 as is connected to the second tapping pipe 4; and a control unit 34 which controls the first three-way valve 20, the second three-way valve 22, and the mixing valve 25 based on the set temperature of hot water supplied from the hot water supply opening 27 that is set as well as the output of the hot water temperature detecting unit 33.

Description

  The present invention relates to a hot water supply apparatus that stores hot water in a hot water storage tank and uses it for hot water supply.

  Conventionally, this kind of hot water supply apparatus has a thing like FIG. 7, for example (for example, refer patent document 1). FIG. 7 is a configuration diagram of a conventional hot water supply apparatus described in Patent Document 1.

  As shown in FIG. 7, the conventional hot water supply apparatus includes a hot water tank 1, a heat pump unit 2 that is a heating means for heating hot water in the hot water tank 1, and a first hot water pipe connected to the upper part of the hot water tank 1. 3 and a second hot water discharge pipe 4 connected to an intermediate part of the hot water storage tank 1 and whether the hot water from the hot water storage tank 1 is discharged through the first hot water discharge pipe 3 or the second hot water discharge pipe 4 is switched. A hot water temperature detecting means 6 for detecting the hot water temperature in the hot water tank 1 at a position where the three-way valve 5 and the second hot water discharge pipe 4 are connected, and a hot water temperature setting means 7 for setting the hot water temperature are provided. If the hot water temperature detected by the detection means 6 is equal to or higher than the hot water supply set temperature set by the hot water supply temperature setting means 7, the hot water is discharged from the second hot water discharge pipe 4, and if it is lower than the hot water supply set temperature, the first hot water discharge pipe 3 is discharged. The flow path of the three-way valve 5 is switched so as to discharge from the hot water.

JP 2003-161518 A

  However, in the configuration of the conventional hot water supply apparatus that switches between the hot water from the upper part of the hot water tank 1 and the hot water from the intermediate part, the hot water is stored in the hot water tank 1 at the time of hot water remaining in the hot water tank 1 and hot water by heat conduction and heat convection. Of the layer (hereinafter referred to as the intermediate temperature layer) that has an intermediate temperature between the water supplied from the bottom of the tank 1, only the hot water at the hot water set temperature or higher can be used, and the hot water set temperature or lower. The hot water in the middle temperature layer moves to the upper part of the hot water tank 1 as it is.

  Here, this operation will be described in detail with reference to FIGS.

  First, FIG. 8 explains the intermediate temperature layer, and shows the temperature distribution with the horizontal axis representing the temperature and the vertical axis representing the hot water tank 1 height. The hot water tank 1 in use is in a state in which high temperature hot water 8 and low temperature water 9 are stacked, but the intermediate temperature between the high temperature hot water 8 and the low temperature water 9 due to heat conduction and heat convection. The intermediate temperature layer 10 that grows grows with time.

  As a difference in the amount of hot water that can be used depending on the size of the intermediate temperature layer 10, the temperature distribution of 11 is a state in which the intermediate temperature layer 10a is small, and 12 is a state in which the intermediate temperature layer 10b is large. When the lower limit is set, the difference in the amount of heat that can be used is schematically represented as the region 13. That is, as the middle temperature layer 10 becomes larger, hot water runs out more easily, and that the amount of heat that can be used in the hot water stored in the hot water storage tank 1 is small, that is, energy saving is low.

  Therefore, the hot water in the intermediate portion of the hot water tank 1 is discharged from the second hot water discharge pipe 4 to reduce the intermediate temperature layer 10, and this operation will be described with reference to FIG.

The position of the hot water discharged from the second hot water discharge pipe 4 is schematically indicated by an arrow 14, and the temperature distribution 15 is the time when the upper end of the intermediate temperature layer 10 reaches the position of the second hot water discharge pipe 4. The size of the intermediate temperature layer 10 is indicated by 10c.

  Thereafter, the hot water of the intermediate temperature layer 10 is discharged through the second hot water discharge pipe 4, so that the temperature distribution becomes 16, and the size of the intermediate temperature layer 10 decreases to 10d. When the hot water temperature in the hot water storage tank 1 falls below the lower limit temperature ts of hot water that can be used for hot water supply at the position of the second hot water discharge pipe 4, the three-way valve 5 is switched to discharge from the first hot water discharge pipe 3. 10 goes to the upper side of the hot water tank 1 as it is, and the temperature distribution also becomes 17 and increases with time as shown in 10e without decreasing.

  Thus, in the case of the conventional hot water supply apparatus, since the effect of reducing the intermediate temperature layer 10 is limited, in addition to not being able to effectively use the amount of hot water in the hot water tank 1, The water at a relatively high temperature in the intermediate temperature layer 10 must be heated, and when the heat pump unit 2 is used as a heating means, there is a characteristic that operation efficiency is lowered when the water temperature is high. Therefore, there is a problem that it hinders efficient driving. That is, in the configuration in which the hot water position is switched, there are problems of a reduction in the amount of hot water that can be used due to the fact that hot water in the mixed layer cannot be discharged, and a reduction in efficiency at the time of boiling by the heat pump unit 2.

  The present invention solves the above-mentioned conventional problems, and by efficiently using hot water in the middle temperature layer, hot water can be used efficiently, and when the heating means is a heat pump, high heating efficiency can be obtained. Then, it aims at providing the hot water supply apparatus which implement | achieves a favorable usability and high energy-saving property.

  In order to solve the conventional problem, a hot water supply apparatus of the present invention includes a hot water storage tank, a first hot water pipe connected to the upper part of the hot water tank, a water supply pipe connected to the lower part of the hot water tank, A second hot water discharge pipe connected between a position where the first hot water discharge pipe is connected and a position where the water supply pipe is connected in the vertical direction of the hot water storage tank, and a water supply branch branched from the water supply pipe A first hot water pipe branch pipe branched from the first hot water pipe, a first three-way valve in which the first hot water pipe and the feed water branch pipe are connected to the inlet side, and the first A second three-way valve in which two outlet pipes and the first outlet pipe branch pipe are connected to the inlet side, a first mixing valve inlet pipe connected to the outlet side of the first three-way valve, A second mixing valve inlet pipe connected to the outlet side of the second three-way valve, the first mixing valve inlet pipe and the second mixing valve inlet pipe A mixing valve connected to the inlet side, a hot water supply pipe connected to the outlet side of the mixing valve, a hot water supply port connected to the hot water supply pipe, and the hot water storage tank connected to the second hot water supply pipe A hot water temperature detecting means for detecting a hot water temperature in the vicinity of the position, a hot water temperature setting means for setting a hot water temperature setting temperature for hot water supply from the hot water supply port, a hot water supply set temperature set by the hot water supply temperature setting means and the hot water temperature detection means Is provided with control means for controlling the operation of the first three-way valve, the second three-way valve and the mixing valve, and is lower than the hot water supply set temperature from an intermediate portion of the hot water storage tank. By effectively discharging hot water in the middle temperature zone, it is possible to make the best use of the amount of heat stored in the hot water and prevent a decrease in boiling efficiency, thus realizing good usability and high energy savings. There is an effect.

  The hot water supply apparatus of the present invention can effectively use the amount of heat of the hot water stored in the middle portion of the hot water tank effectively from the intermediate portion of the hot water tank, and can prevent a decrease in boiling efficiency. Therefore, there is an effect that good usability and high energy saving can be realized.

Configuration diagram of hot water supply apparatus in Embodiment 1 of the present invention Block diagram of control of the water heater Flow chart of control of the water heater The figure which showed temperature distribution in hot water storage tank at the time of hot water supply use of the hot water supply device The block diagram of the hot-water supply apparatus in Embodiment 2 of this invention Flow chart of control of the water heater Configuration diagram of conventional hot water supply equipment Explanatory drawing of the middle temperature layer in the hot water storage tank of the hot water supply device The figure which showed temperature distribution in the hot water storage tank of the hot water supply device

  1st invention WHEREIN: The hot water storage tank, the 1st hot water pipe connected to the upper part of the said hot water storage tank, the water supply pipe connected to the lower part of the said hot water storage tank, and the said 1st in the up-down direction of the said hot water storage tank A second hot water pipe connected between a position where the hot water pipe is connected and a position where the water pipe is connected, a water supply branch pipe branched from the water pipe, and a branch from the first hot water pipe The first hot water outlet pipe branch pipe, the first three-way valve in which the first hot water outlet pipe and the feed water branch pipe are connected to the inlet side, the second hot water outlet pipe and the first hot water outlet pipe A branch pipe is connected to the second three-way valve connected to the inlet side, a first mixing valve inlet pipe connected to the outlet side of the first three-way valve, and connected to the outlet side of the second three-way valve A second mixing valve inlet pipe, a mixing valve in which the first mixing valve inlet pipe and the second mixing valve inlet pipe are connected to the inlet side; A hot water supply pipe connected to the outlet side of the valve, a hot water supply outlet connected to the hot water supply pipe, and a hot water temperature detecting means for detecting the hot water temperature in the vicinity of the hot water storage tank connected to the second hot water discharge pipe; A hot water supply temperature setting means for setting a hot water supply temperature setting for supplying hot water from the hot water supply port, and a first hot water temperature setting means set by the hot water supply temperature setting means and an output of the hot water temperature detection means. And a control means for controlling the operation of the second three-way valve and the mixing valve, and from the intermediate part of the hot water storage tank, the hot water in the middle temperature layer lower than the hot water supply set temperature is effectively discharged, Since the amount of heat of the hot water used can be used to the maximum extent and the boiling efficiency can be prevented from being lowered, there is an effect that good usability and high energy saving can be realized.

  According to the second aspect of the invention, in particular, the control means of the first aspect of the invention is the first temperature preset by the hot water temperature detected by the hot water temperature detecting means with respect to the hot water supply set temperature set by the hot water supply temperature setting means. When the difference is higher than the difference, the incoming water to the first three-way valve is on the water supply branch pipe side and the incoming water to the second three-way valve is on the second outlet pipe side, and the hot water temperature detected by the hot water temperature detecting means Is lower than a preset second temperature difference with respect to the hot water supply set temperature, the water entering the first three-way valve is set to the first hot water outlet side and the water entering the second three-way valve. The hot water temperature detected by the hot water temperature detecting means is higher than the hot water supply set temperature by the first temperature difference and lower by the second temperature difference. In the meantime, the water entering the first three-way valve is on the water supply branch pipe side and the second The water entering the three-way valve is on the first outlet pipe branch pipe side, and the outlet temperature of the mixing valve is controlled to the hot water supply set temperature, effectively using hot water in the middle temperature zone while maintaining controllability of the hot water temperature. There is an effect that can be done.

  In particular, the third invention provides at least one additional hot water supply port in addition to the hot water supply port of the first invention, and the hot water supply temperature setting means has an additional hot water supply set temperature for each additional hot water supply port, and the additional hot water supply port Corresponding to each, a first mixing valve inlet pipe branch pipe branched from the first mixing valve inlet pipe, a second mixing valve inlet pipe branch pipe branched from the second mixing valve inlet pipe, An additional mixing valve in which the first mixing valve inlet pipe branch pipe and the second mixing valve inlet pipe branch pipe are connected to the inlet side, and an additional hot water supply pipe connected to the outlet side of the additional mixing valve And the control means mixes the first three-way valve and the second three-way valve based on the hot water supply set temperature set by the hot water supply temperature setting means, the additional hot water supply set temperature, and the detected temperature of the hot water temperature detection means. Controls the operation of the valve and the additional mixing valve. There is an effect that can be effectively utilized.

In the fourth aspect of the invention, in particular, the control means of the third aspect of the invention is configured such that the hot water temperature detected by the hot water temperature detecting means is the highest among the hot water supply set temperature set by the hot water supply temperature setting means and the additional hot water supply set temperature. On the other hand, when higher than a preset first temperature difference, the water entering the first three-way valve is on the water supply branch pipe side and the water entering the second three-way valve is on the second hot water pipe side, When the hot water temperature detected by the hot water temperature detecting means is lower than a preset second temperature difference with respect to the lowest one of the hot water supply set temperature and the additional hot water supply set temperature, the first three-way valve is supplied to the first three-way valve. The incoming water is on the first hot water outlet side and the incoming water to the second three-way valve is on the second hot water outlet side, and the hot water temperature detected by the hot water temperature detecting means is the hot water supply set temperature and the additional hot water supply. A temperature that is higher by the first temperature difference than the highest set temperature. And the hot water supply set temperature and the additional hot water supply set temperature are lower than the lowest temperature by the second temperature difference, the water entering the first three-way valve is supplied to the water supply branch pipe side. In addition, the inlet water to the second three-way valve is the first outlet pipe branch pipe side, the outlet temperature of the mixing valve is controlled to the hot water supply set temperature, and the outlet temperature of the additional mixing valve is set to the additional hot water supply set temperature. It has the effect of being able to effectively use hot water in the middle temperature zone while ensuring controllability in the case of having a plurality of hot water outlets.

  In the fifth aspect of the invention, in particular, a hot water supply presence / absence detection means for detecting the presence or absence of hot water supply is provided in each of the hot water supply pipe and the additional hot water supply pipe of the third invention, and the control means is supplied with hot water by the hot water supply presence / absence detection means. The hot water temperature detected by the hot water temperature detecting means is preset with respect to the hot water temperature setting temperature set by the hot water temperature setting means or the additional hot water temperature setting temperature corresponding to the hot water inlet or the additional hot water outlet detected. When the temperature difference is higher than 1, the incoming water to the first three-way valve is on the water supply branch pipe side and the incoming water to the second three-way valve is on the second hot water outlet pipe side, and is detected by the hot water temperature detecting means. When the hot water temperature is lower than a preset second temperature difference with respect to the hot water supply set temperature or the additional hot water set temperature, the water entering the first three-way valve is set to the first hot water outlet side. Incoming water into the second three-way valve On the hot water pipe side, the hot water temperature detected by the hot water temperature detecting means is higher than the hot water supply set temperature or the additional hot water set temperature by the first temperature difference and the hot water set temperature or the additional hot water set. When the temperature is lower than the temperature by the second temperature difference, the water entering the first three-way valve is on the water supply branch pipe side and the water entering the second three-way valve is the first. The outlet temperature of the hot water outlet pipe is controlled to the outlet temperature of the mixing valve or the additional mixing valve to the hot water supply set temperature or the additional hot water set temperature. By controlling, there is an effect of improving the utilization effect of the hot water in the middle temperature layer.

  In the sixth aspect of the invention, in particular, when the control means of the fifth aspect of the invention detects that hot water is supplied to two or more of the hot water supply port and the additional hot water supply port by the hot water supply presence / absence detection means, the hot water temperature detection means When the detected hot water temperature is higher than a preset first temperature difference with respect to the highest hot water supply set temperature or additional hot water set temperature corresponding to the hot water supply port and the additional hot water supply port, The water entering the first three-way valve is on the water supply branch pipe side and the water entering the second three-way valve is on the second hot water outlet pipe side, and the hot water temperature detected by the hot water temperature detecting means is supplied. When the hot water supply temperature corresponding to the hot water supply port and the additional hot water supply port or the additional hot water supply set temperature is lower than a preset second temperature difference with respect to the lowest one, the first three-way valve And the first hot water outlet side of the water Water flowing into the three-way valve of the second side is the second outlet pipe side, and the hot water temperature detected by the hot water temperature detecting means is the hot water supply temperature set corresponding to the hot water supply port and the additional hot water supply port. A temperature higher by the first temperature difference than the highest one of the additional hot water supply set temperatures, and a temperature lower by the second temperature difference than the lowest one of the hot water supply set temperature and the additional hot water set temperature. The water entering the first three-way valve is on the side of the feed water branch pipe and the water entering the second three-way valve is on the side of the first outlet pipe branch pipe, and the hot water is supplied. The outlet temperature of the mixing valve corresponding to the hot water supply port and the additional hot water supply port and the outlet temperature of the additional mixing valve are respectively controlled to the hot water supply set temperature and the additional hot water supply set temperature. While maintaining controllability of hot water supply temperature, There is an effect that can be effectively utilized the hot water of the layers.

The seventh invention is particularly provided with a heating means for heating the water in the hot water storage tank of any one of the first to sixth inventions, and the heating means uses a heat pump cycle. As a result of being able to apply a low boiling temperature by effectively utilizing the amount of heat of hot water, it is possible to maximize the characteristics of high efficiency.

  The eighth invention, in particular, is a supercritical refrigerant circuit in which the pressure of the seventh invention is a critical pressure or higher, and heats water with a refrigerant whose pressure is higher than the critical pressure. Since the temperature can be increased, it is possible to increase the amount of heat that can be used and to prevent the hot water from running out.

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

(Embodiment 1)
The hot water supply apparatus in the 1st Embodiment of this invention is demonstrated using FIGS. FIG. 1 is a configuration diagram of a hot water supply apparatus according to the present embodiment.

  In FIG. 1, a hot water supply apparatus in the present embodiment includes a hot water storage tank 1, a heat pump unit 2 as a heating means for heating water in the hot water storage tank 1, and a first hot water pipe connected to the upper part of the hot water storage tank 1. 3, between the position where the first hot water pipe 3 and the water supply pipe 18 are connected, that is, the second hot water connected to the body of the hot water tank 1. A pipe 4, a water supply branch pipe 19 branched from the water supply pipe 18, a first three-way valve 20 in which the first hot water discharge pipe 3 and the water supply branch pipe 19 are connected to the inlet side, and the first hot water discharge pipe 3 A first hot water branch pipe 21 branched from the second hot water pipe 4, a second hot water pipe 4 and a first hot water pipe branch pipe 21 connected to the inlet side, and a first three way valve The first mixing valve inlet pipe 23 connected to the outlet side of 20 and the second mixing connected to the outlet side of the second three-way valve 22 A water inlet pipe 24, a first mixing valve inlet pipe 23 and a second mixing valve inlet pipe 24 connected to the inlet side, a mixing valve 25, and a hot water supply pipe 26 connected to the outlet side of the mixing valve 25 The hot water supply port 27 connected to the hot water supply pipe 26, the first mixing valve inlet pipe branch pipe 28 branched from the first mixing valve inlet pipe 23, and the second mixing valve inlet pipe 24 were branched. The second mixing valve inlet pipe branch pipe 29, the first mixing valve inlet pipe branch pipe 28 and the second mixing valve inlet pipe branch pipe 29 connected to the inlet side, and this additional mixing valve The hot water temperature in the hot water storage tank 1 at the position where the additional hot water pipe 31 connected to the outlet side of the valve 30, the additional hot water inlet 32 connected to the additional hot water pipe 31, and the second hot water outlet pipe 4 is connected. Hot water temperature detecting means 33 to detect, hot water supply temperature for setting hot water supply temperatures of hot water supply port 27 and additional hot water supply port 32 The first three-way valve 20, the second three-way valve 22, the mixing valve 25, and the additional mixing valve 30 based on the setting means 7, the output of the hot water temperature detection means 33 and the setting of the hot water supply temperature setting means 7. And a control device 35 having a control means 34 for controlling the control.

  A mixing valve outlet hot water temperature detecting means 36 and an additional mixing valve outlet hot water temperature detecting means 37 for hot water temperature control are provided on the outlet side of the mixing valve 25 and the additional mixing valve 30.

  FIG. 2 shows a block diagram of the control of the hot water supply apparatus in the present embodiment. Based on the output of the hot water temperature detection means 33 and the setting of the hot water supply temperature setting means 7, the first three-way valve 20 and the second three-way The control unit 34 controls the valve 22, the mixing valve 25, and the additional mixing valve 30.

  About the hot water supply apparatus in this Embodiment comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  As a basic operation, the hot water tank 1 is filled with a lot of low-temperature water before boiling, and when the operation is started, the water in the hot water tank 1 is sent to the heat pump unit 2 where it is heated and heated. Hot water is returned to the hot water tank 1. As a result, hot water is stored in the hot water tank 1.

  When using the hot water supply after boiling, the mixing valve 25 and the additional mixing valve 30 are used for the hot water in the hot water storage tank 1 discharged from the first hot water discharge pipe 3 and the second hot water discharge pipe 4 and the water supply from the water supply pipe 18. Are mixed with the respective hot water supply set temperatures and supplied to the hot water supply port 27 or the additional hot water supply port 32. In addition, water corresponding to the amount of hot water used for hot water supply flows from the lower part of the hot water tank 1 through the water supply pipe 18.

  Here, the operation when using the hot water supply will be described in detail with reference to FIGS. The hot water supply temperatures are respectively set as the hot water supply set temperature ts1 and the additional hot water supply set temperature ts2 by the hot water supply temperature setting means 7 for each hot water supply port 27 and additional hot water supply port 32, and the higher value thereof is ts1.

  FIG. 3 is a flowchart of control of the hot water supply apparatus in the present embodiment. tm is a measurement value by the hot water temperature detection means 33, and the control means 34 controls the flow path of the first three-way valve 20 and the second three-way valve 22 based on this measurement value.

  When the measured value tm by the hot water temperature detection means 33 is equal to or higher than the hot water supply set temperature ts1 (step 1 (S1)), the inlet side of the first three-way valve 20 is the side to which the water supply branch pipe 19 is connected. Open and the inlet side of the second three-way valve 22 opens the side to which the second hot water discharge pipe 4 is connected (step 2 (S2)). When tm is the additional hot water supply set temperature ts2-10 ° C. or less (step 3 (S3)), the inlet side of the first three-way valve 20 opens the side to which the first hot water discharge pipe 3 is connected, and the second The inlet side of the three-way valve 22 opens the side to which the second hot water discharge pipe 4 is connected (step 4 (S4)).

  Furthermore, when tm is between ts1 and ts2-10 ° C., that is, when conditions other than the conditions of Step 1 and Step 3 are satisfied, the feed water branch pipe 19 is connected to the inlet side of the first three-way valve 20. The inlet side of the second three-way valve 22 is opened on the side to which the first outlet pipe branch pipe 21 is connected (step 5 (S5)).

  With the above operation, the water temperature on the inlet side of the mixing valve 25 and the additional mixing valve 30 becomes higher and lower than ts1 and ts2, so that when the hot water is supplied through the hot water supply port 27, the control means 34 25 is controlled to adjust the flow rate ratio so that the mixing valve outlet hot water temperature detecting means 36 becomes the hot water supply set temperature ts1 (step 6 (S6)).

  Hot water adjusted to the hot water supply set temperature ts 1 is supplied from the hot water supply port 27 through the hot water supply pipe 26. When hot water is supplied from the additional hot water supply port 32, the control means 34 controls the additional mixing valve 30 and adjusts the flow rate ratio so that the additional mixing valve outlet hot water temperature detection means 37 reaches the additional hot water supply set temperature ts2. (Step 6).

  In this description, the temperature difference between the hot water supply set temperature ts1 and the measured value by the hot water temperature detection means 33 is controlled using 0 ° C. as a threshold, but the controllability of the mixing valve 25 and the temperature drop in the piping are taken into consideration. Then, an arbitrary value may be added to ts1 in the expression of Step 1.

  FIG. 4 is a diagram showing changes in the temperature distribution in the hot water tank 1. The horizontal axis indicates the temperature, the vertical axis indicates the height of the hot water tank 1, and the temperature distribution 38 indicates that the upper end of the intermediate temperature layer 10 is located at the connection position with the hot water tank 1 of the second hot water outlet pipe 4, that is, It is a state just before the hot water use of the intermediate temperature layer 10 is started. As described above, when the hot water temperature at the connection position of the second tapping pipe 4 is equal to or higher than ts1, tapping is from the second tapping pipe 4, and only hot water in the middle temperature layer 10 is used.

While this hot water temperature is less than ts1 and higher than ts2-10 ° C., the hot water is discharged from the first hot water discharge pipe 3, so the intermediate temperature layer 10 is not reduced and moves upward of the hot water tank 1. Further, when the hot water temperature at the connection position of the second tap pipe 4 becomes ts2-10 ° C. or less, hot water is mixed from the first tap pipe 3 and the second tap pipe 4, so As the hot water is used again and the hot water is discharged from the first hot water pipe 3, the intermediate temperature layer 10 moves upwardly of the hot water tank 1 while being reduced.

  As a result, the size of the intermediate temperature layer 10 is initially 10 f but is reduced to 10 g. Reference numeral 39 denotes a temperature distribution when the intermediate temperature layer 10g passes through the connection position of the second hot water discharge pipe 4. In addition, the temperature gradient is given in the part more than ts1 because there is a heat transfer from the hot water to the intermediate temperature layer 10 with the passage of time while the intermediate temperature layer 10 passes through the connection position of the second tapping pipe 4. .

  Thus, according to the first embodiment of the present invention, the hot water supply set temperature of the hot water supply port 27 set by the hot water supply temperature setting means 7, the value of the additional hot water supply set temperature of the additional hot water supply port 32, and the hot water temperature detection means. Based on the measured value 33, the flow path of the first three-way valve 20 and the second three-way valve 22 is switched to effectively reduce the middle temperature zone 10, thereby reducing the amount of available hot water and the heat pump unit 2 As a result, it is possible to prevent a decrease in the boiling efficiency of the battery, so that it is possible to realize good usability and high energy saving.

  Further, the refrigeration cycle of the heat pump unit 2 is preferably operated at a pressure exceeding the critical pressure using carbon dioxide as the refrigerant. Since the boiling temperature can be increased by using carbon dioxide as a refrigerant, the hot water temperature in the hot water tank 1 can be freely controlled.

(Embodiment 2)
FIG. 5 is a configuration diagram of a hot water supply apparatus according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the hot-water supply apparatus in the said 1st Embodiment, and the description is abbreviate | omitted.

  In the hot water supply apparatus in the present embodiment, in addition to the configuration in the first embodiment, the hot water supply pipe 26 and the additional hot water supply pipe 31 are respectively provided with a first flow meter 40 and a second flow rate as hot water supply presence / absence detection means. A total of 41 is provided.

  Thereby, since the valve is controlled based on the set temperature at which hot water is actually supplied, the effect of reducing the intermediate temperature layer 10 is higher.

  FIG. 6 is a flowchart of control of the hot water supply apparatus in the present embodiment. A method of determining either the hot water supply set temperature ts1 or the additional hot water supply set temperature ts2 as the set temperature ts based on the outputs of the first flow meter 40 and the second flow meter 41 is shown.

  First, the hot water supply set temperature ts1 at the hot water supply port 27 and the additional hot water supply set temperature ts2 at the additional hot water supply port 32 are compared (step 11 (S11)), and the higher value is set as the set temperature ts (step 12 (S12)). Step 13 (S13)).

  Next, when the first flow meter 40 detects hot water supply from the hot water supply port 27 (step 14 (S14)), and the second flow meter 41 also detects hot water supply from the additional hot water supply port 32 (step 15). (S15)), the hot water supply set temperature ts1 and the additional hot water supply set temperature ts2 are compared (step 16 (S16)), and the higher value is set as the set temperature ts (step 17 (S17), step 18 (S18)). .

If there is no hot water supply from the additional hot water supply port 32 (step 15), the hot water supply set temperature ts1 is set as the set temperature ts (step 19 (S19)). If hot water supply from the hot water supply port 27 is not detected in step 14 and hot water supply is detected in the additional hot water supply port 32 (step 20 (S20)), the additional hot water supply set temperature ts2 is set as the set temperature ts (step 21 (S21)). ). If no hot water supply is detected at either the hot water supply port 27 or the additional hot water supply port 32 (steps 14 and 20), step 12 is performed.
Alternatively, the value adopted in step 13 is used as it is.

  Based on the set temperature ts determined in this way, the same operation is performed by replacing ts1 and ts2 with ts in the valve control (flowchart of FIG. 3) described in the first embodiment (step 22). (S22)).

  As described above, according to the second embodiment of the present invention, the valve is finely controlled according to the hot water supply state, the effect of reducing the intermediate temperature layer 10 is further increased, and the usability and energy saving are further increased. Excellent in properties.

  As described above, the hot water supply apparatus according to the present invention minimizes the decrease in the amount of hot water that can be supplied when using the heat of hot water in the hot water storage tank, so that it can be applied to the above-mentioned domestic hot water supply apparatuses. It can also be applied to large-scale applications such as business use in a system having a heat source and a hot water tank, and can provide excellent energy saving.

1 Hot water storage tank 2 Heat pump unit (heating means)
3 First hot water pipe 4 Second hot water pipe 7 Hot water supply temperature setting means 18 Water supply pipe 19 Water supply branch pipe 20 First three-way valve 21 First hot water pipe branch pipe 22 Second three-way valve 23 First mixing valve Inlet pipe 24 Second mixing valve inlet pipe 25 Mixing valve 26 Hot water supply pipe 27 Hot water inlet 28 First mixing valve inlet pipe branch pipe 29 Second mixing valve inlet pipe branch pipe 30 Additional mixing valve 31 Additional hot water pipe 32 Additional hot water supply Port 33 Hot water temperature detecting means 34 Control means 36 Mixing valve outlet hot water temperature detecting means 37 Additional mixing valve outlet hot water temperature detecting means 40 First flow meter (hot water supply presence detecting means)
41 2nd flow meter (hot water supply presence detection means)

Claims (8)

A hot water storage tank, a first hot water pipe connected to the upper part of the hot water tank, a water supply pipe connected to the lower part of the hot water tank, and the first hot water pipe connected in the vertical direction of the hot water tank A second hot water pipe connected between a position and a position to which the water supply pipe is connected; a water supply branch pipe branched from the water supply pipe; and a first hot water branch branched from the first hot water pipe A pipe branch pipe, a first three-way valve in which the first outlet pipe and the feed water branch pipe are connected to the inlet side, the second outlet pipe and the first outlet pipe branch pipe are on the inlet side A second three-way valve connected to the outlet, a first mixing valve inlet pipe connected to the outlet side of the first three-way valve, and a second mixing connected to the outlet side of the second three-way valve A mixing valve in which a valve inlet pipe, the first mixing valve inlet pipe and the second mixing valve inlet pipe are connected to the inlet side; and an outlet side of the mixing valve A hot water supply pipe connected to the hot water supply pipe, a hot water temperature detection means for detecting a hot water temperature in the vicinity of the hot water storage tank to which the second hot water discharge pipe is connected, and the hot water supply port. Based on the hot water supply temperature setting means for setting the hot water supply set temperature for hot water supply, the hot water supply set temperature set by the hot water supply temperature setting means and the output of the hot water temperature detection means, the first three-way valve and the second A hot water supply apparatus comprising control means for controlling operations of the three-way valve and the mixing valve. The control means supplies the first three-way valve to the first three-way valve when the hot water temperature detected by the hot water temperature detecting means is higher than a preset first temperature difference with respect to the hot water supply set temperature set by the hot water supply temperature setting means. The incoming water is on the water supply branch pipe side and the incoming water to the second three-way valve is on the second hot water outlet pipe side, and the hot water temperature detected by the hot water temperature detecting means is preset with respect to the hot water supply set temperature. When the temperature difference is two or more, the water entering the first three-way valve is on the first hot water outlet side and the water entering the second three-way valve is on the second hot water outlet side, and the hot water temperature is When the hot water temperature detected by the detecting means is between the temperature higher by the first temperature difference and the temperature lower by the second temperature difference than the hot water supply set temperature, the first three-way valve is supplied to the first three-way valve. The incoming water is on the side of the water supply branch pipe and the incoming water to the second three-way valve is for the first outlet pipe. And the tube side, water heater according to claim 1, the outlet temperature of the mixing valve and configured to control the hot water supply set temperature. In addition to the hot water supply port, at least one additional hot water supply port is provided, and the hot water supply temperature setting means has an additional hot water supply set temperature for each additional hot water supply port, and corresponds to each additional hot water supply port. A first mixing valve inlet pipe branch pipe branched from the second mixing valve inlet pipe branch pipe, a first mixing valve inlet pipe branch pipe branched from the second mixing valve inlet pipe, and the first mixing valve inlet pipe branch pipe And an additional hot water supply pipe connected to the outlet side of the additional mixing valve, and the control means is set by the hot water temperature setting means Controlling operations of the first three-way valve, the second three-way valve, the mixing valve, and the additional mixing valve based on the set hot water supply temperature, the additional hot water setting temperature, and the detected temperature of the hot water temperature detecting means. The hot water supply device according to claim 1, wherein The control means has a hot water temperature detected by the hot water temperature detecting means that is higher than a preset first temperature difference with respect to the highest one of the hot water supply set temperature set by the hot water supply temperature setting means and the additional hot water supply set temperature. In this case, water entering the first three-way valve is on the water supply branch side and water entering the second three-way valve is on the second hot water outlet side, and the hot water temperature detected by the hot water temperature detecting means is the hot water supply. When the temperature difference is lower than a preset second temperature difference with respect to the lowest one of the set temperature and the additional hot water supply set temperature, the water entering the first three-way valve is set to the first hot water outlet side and the first Water entering the three-way valve of the second side is the second hot water outlet pipe side, and the hot water temperature detected by the hot water temperature detecting means is the highest of the hot water supply set temperature and the additional hot water supply set temperature. The temperature difference between the temperature and the hot water supply set temperature and the additional supply When the temperature is lower than the lowest set temperature by the second temperature difference, the water entering the first three-way valve is on the water supply branch pipe side and the second three-way valve. The configuration is such that the water entering the first hot water branch pipe side is controlled, the outlet temperature of the mixing valve is controlled to the hot water supply set temperature, and the outlet temperature of the additional mixing valve is controlled to the additional hot water supply set temperature. The hot water supply device described. Each of the hot water supply pipe and the additional hot water supply pipe is provided with hot water supply presence / absence detection means for detecting the presence / absence of hot water supply, and the control means corresponds to the hot water supply port or the additional hot water supply port detected by the hot water supply presence / absence detection means. When the hot water temperature detected by the hot water temperature detection means is higher than a preset first temperature difference with respect to the hot water supply set temperature set by the hot water supply temperature setting means or the additional hot water supply set temperature, the first three-way The water entering the valve is on the water supply branch pipe side and the water entering the second three-way valve is on the second hot water discharge pipe side, and the hot water temperature detected by the hot water temperature detecting means is the hot water supply set temperature or the additional hot water supply setting. When the temperature is lower than a preset second temperature difference, the water entering the first three-way valve is set to the first outlet pipe side and the water entering the second three-way valve is the second. The hot water temperature detection means The detected hot water temperature is higher than the hot water set temperature or the additional hot water set temperature by the first temperature difference, and the second temperature difference relative to the hot water set temperature or the additional hot water set temperature. When the temperature is only low, the water entering the first three-way valve is on the side of the feed water branch pipe and the water entering the second three-way valve is on the side of the first outlet pipe branch pipe, Or the hot-water supply apparatus of Claim 3 made it the structure which controls the exit temperature of an additional mixing valve to the said hot-water supply preset temperature or the said additional hot-water supply preset temperature. The control means is configured such that when the hot water presence / absence detecting means detects that hot water is supplied to two or more of the hot water supply port and the additional hot water supply port, the hot water temperature detected by the hot water temperature detection means And the hot water supply set temperature corresponding to the additional hot water supply port or the additional hot water supply set temperature is higher than the preset first temperature difference, the incoming water to the first three-way valve is the water supply branch pipe side And the hot water temperature detected by the hot water temperature detecting means corresponds to the hot water supply port supplied with the hot water supply port and the additional hot water supply port. When the preset temperature or the additional hot water supply set temperature is lower than a preset second temperature difference by a predetermined temperature difference or less, the incoming water to the first three-way valve is the first hot water outlet side and the Incoming water into the second three-way valve On the hot water pipe side, the hot water temperature detected by the hot water temperature detecting means is the highest of the hot water supply set temperature corresponding to the hot water supply port and the additional hot water supply port and the additional hot water supply set temperature. The first three-way when the temperature is higher by the first temperature difference, the hot water supply set temperature, and the additional hot water set temperature than the lowest temperature by the second temperature difference. Mixing valve corresponding to the hot-water supply port and the additional hot-water supply port, with the water entering the valve being the water supply branch pipe side and the water entering the second three-way valve being the first outlet pipe branch pipe side The hot water supply apparatus according to claim 5, wherein the outlet temperature of the additional mixing valve is controlled to the hot water set temperature and the additional hot water set temperature, respectively. The hot water supply apparatus according to any one of claims 1 to 6, wherein a heating means for heating water in the hot water storage tank is provided, and the heating means uses a heat pump cycle. The hot water supply apparatus according to claim 7, wherein the heat pump cycle is a supercritical refrigerant circuit in which the pressure is equal to or higher than a critical pressure, and water is heated by a refrigerant whose pressure is increased to the critical pressure or higher.

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