JP5488276B2 - Water heater - Google Patents

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

  In FIG. 7, a conventional hot water supply apparatus includes a hot water tank 1, a heat pump unit 2 as a heating means for heating hot water in the hot water tank 1, a first hot water pipe 3 connected to the upper part of the hot water tank 1, A second tapping pipe 4 connected to an intermediate portion of the hot water tank 1 and a three-way valve 5 for switching whether the hot water from the hot water tank 1 is drained through the first tapping pipe 3 or the second tapping pipe 4. And a hot water temperature detecting means 6 for detecting the hot water temperature in the hot water storage tank 1 at a position to which the second hot water discharge pipe 4 is connected, and a hot water temperature setting means 7 for setting the hot water temperature. If the detected hot water temperature 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 the hot water temperature is lower than the hot water supply set temperature, the hot water is discharged from the first hot water discharge pipe 3. Thus, the flow path of the three-way valve 5 is switched.

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 tank in the hot water tank 1 during hot water use and the remaining hot water in the hot water tank 1 due to heat conduction and heat convection. Of the layer having an intermediate temperature between the water supplied from the lower part of 1 (hereinafter referred to as the “medium temperature layer”), only the hot water at the temperature higher than the hot water supply set temperature can be used. The hot water in the medium temperature layer below the set temperature 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 storage tank 1 in use is in a state in which high temperature hot water 8 and low temperature water 9 are stacked, and the intermediate 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 becomes the temperature grows with the passage of time. As the difference in the amount of hot water that can be used depending on the size of the intermediate temperature layer 10, the temperature distribution 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 corresponds to 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.

  For this reason, the hot water in the intermediate part 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. A hot water discharge position from the second hot water discharge pipe 4 is schematically indicated by an arrow 14, and a temperature distribution 15 is a time point 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 so as to discharge from the first hot water discharge pipe 3. The layer 10 goes directly upward of the hot water tank 1, and the temperature distribution also becomes 17 and becomes larger 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 middle 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 that the amount of hot water that can be used is reduced due to the fact that hot water in the mixed layer cannot be discharged, and that the efficiency at the time of boiling by the heat pump unit is reduced.

  The present invention solves the above-mentioned conventional problems, by effectively using hot water in the middle temperature layer, and by using hot water efficiently, and when the heating means is a heat pump, high heating efficiency can be obtained. An object of the present invention is to provide a hot water supply device that realizes good usability and high energy saving.

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 mixing valve in which a pipe, the first outlet pipe and the feed water branch pipe are connected to the inlet side, a primary mixed water pipe connected to the outlet side of the first mixing valve, and the second And a secondary mixing water pipe connected to the outlet side of the second mixing valve, and a secondary mixing water pipe connected to the secondary mixing water pipe. And a hot water temperature detecting means for detecting a hot water temperature in the vicinity of the hot water storage tank connected to the second hot water outlet. Based on the hot water supply temperature setting means for setting the hot water supply set temperature for hot water supply from the hot water supply port, the hot water supply set temperature set by the hot water supply temperature setting means and the detected temperature of the hot water temperature detection means, the first mixing valve and a control means for controlling the operation of the second mixing valve with said control means, said hot water set temperature hot water sensed temperature by the water temperature detecting means is set by the hot water supply temperature setting means When the temperature difference is higher than a preset first temperature difference, the water entering the first mixing valve is set to the water supply branch pipe side, and the outlet temperature of the second mixing valve is controlled to the hot water supply set temperature. 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 hot water supply set temperature, the water entering the first mixing valve is allowed to flow into the first hot water pipe side. And the second mixing valve A hot water temperature detected by the hot water temperature detecting means is controlled to be the hot water supply set temperature, and the hot water temperature detected by the hot water supply temperature is higher by the first temperature difference and lower by the second temperature difference. In the case of the interval, the outlet temperature of the first mixing valve is controlled to the hot water supply set temperature, and the water entering the second mixing valve is on the primary mixing water pipe side. In the middle of the hot water tank, the hot water in the middle temperature layer that is lower than the hot water supply set temperature is effectively discharged, so that the amount of heat of the hot water can be used to the maximum and the lowering of the boiling efficiency can be prevented. Therefore, there is an effect that good usability and high energy saving can be realized.

  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 operation 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 supply pipe is connected; a water supply branch pipe branched from the water supply pipe; the first hot water pipe; A first mixing valve having a feed water branch pipe connected to the inlet side, a primary mixing water pipe connected to the outlet side of the first mixing valve, the second tapping pipe, and the primary mixing water pipe are inlets. A second mixing valve connected to the side, a secondary mixing water pipe connected to the outlet side of the second mixing valve, a hot water supply port connected to the secondary mixing water pipe, and the second tapping pipe A hot water temperature detecting means for detecting a hot water temperature in the vicinity of the hot water storage tank connected to the hot water tank, and a hot water supply set temperature for supplying hot water from the hot water outlet. The operation of the first mixing valve and the second mixing valve based on the hot water temperature setting means to be set, the hot water set temperature set by the hot water temperature setting means and the detected temperature of the hot water temperature detecting means and a control means for controlling said control means, a first which has been hot water detected by the water temperature detecting means is preset to the hot water supply temperature setting means and the hot water supply set temperature set by When the temperature difference is higher than the temperature difference, water entering the first mixing valve is set to the water supply branch pipe side, the outlet temperature of the second mixing valve is controlled to the hot water supply set temperature, and 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, the water entering the first mixing valve is on the first hot water outlet side and the second mixing valve Control the outlet temperature to the hot water supply set temperature, The first mixing valve when the hot water temperature detected by the hot water temperature detection means is between a temperature higher by the first temperature difference and a temperature lower by the second temperature difference than the hot water supply set temperature. The outlet temperature of the hot water supply is controlled to the hot water supply set temperature and the water entering the second mixing valve is on the primary mixed water pipe side. By effectively discharging the hot water of the lower middle temperature layer, it is possible to make the best use of the amount of heat stored in the hot water and prevent the boiling efficiency from being lowered. There is an effect that it can be realized.

In addition, 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, water is supplied to the first mixing valve. The second water temperature is set to be the water supply branch pipe side, the outlet temperature of the second mixing valve is controlled to the hot water supply set temperature, and the hot water temperature detected by the hot water temperature detection means is set in advance to the hot water supply set temperature. When the temperature difference is lower than the temperature difference, the water entering the first mixing valve is set to the first hot water outlet side, the outlet temperature of the second mixing valve is controlled to the hot water supply set temperature, and the hot water temperature detecting means When the detected hot water temperature 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 outlet temperature of the first mixing valve is Controlling to a hot water supply set temperature and the second mixing valve The water inlet intended to be primary mixing water pipe side, while maintaining the controllability of the hot water supply temperature, there is an effect that can be effectively utilized hot water medium temperature layer.

In particular, the second 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 primary mixed water branch pipe branched from the primary mixed water pipe, a second hot water branch pipe branched from the second hot water pipe, the primary mixed water branch pipe and the second hot water outlet An additional mixing valve connected to the inlet side of the pipe branch pipe and an additional secondary mixed water pipe connected to the outlet side of the additional mixing valve, and the control means is a hot water supply set by the hot water supply temperature setting means Controlling the operation of the first mixing valve, the second mixing valve, and the additional mixing valve based on the set temperature, the additional hot water set temperature, and the detected temperature of the hot water temperature detecting means. Even if it has, there is an effect that the hot water in the middle temperature layer can be used effectively.

In particular, the third aspect of the invention sets in advance for the hot water temperature detected by the hot water temperature detecting means of the second aspect of the invention, 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. When the temperature difference is higher than the first temperature difference, the water entering the first mixing valve is set to the feed water branch pipe side, and the outlet temperatures of the second mixing valve and the additional mixing valve are set to the hot water supply set temperature and the additional hot water supply, respectively. When the hot water temperature detected by the hot water temperature detection 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 inlet water to the first mixing valve is the first hot water outlet side, and the outlet temperature of the second mixing valve and the additional mixing valve is controlled to the hot water supply set temperature and the additional hot water supply set temperature, respectively, Detection by hot water temperature detection means The temperature of the hot water set is higher by the first temperature difference than the highest one of the hot water supply set temperature and the additional hot water set temperature, and the lowest of the hot water set temperature and the additional hot water set temperature. On the other hand, when the temperature is lower by the second temperature difference, the outlet temperature of the first mixing valve is controlled to the lowest one of the hot water supply set temperature and the additional hot water supply set temperature, and the second Incoming water to the mixing valve is the temporary mixed water pipe side, and the incoming water to the additional mixing valve is the primary mixed water branch pipe side, while ensuring controllability when having multiple hot water outlets, There is an effect that hot water can be used effectively.

A fourth invention is, in particular, the hot water supply presence detection means for detecting the presence or absence of hot water to each of the secondary mixing water pipe with additional secondary mixing water tubes of the second invention is provided, the control means, water heating by the hot water supply presence detection means The hot water temperature detected by the hot water temperature detection means corresponds to the hot water supply temperature set by the hot water supply temperature setting means or the additional hot water supply temperature corresponding to the hot water supply port or the additional hot water supply port detected to have been detected in advance. When the temperature difference is higher than the set first temperature difference, the water entering the first mixing valve is set to the feed water branch pipe side, and the outlet temperature of the second mixing valve or the additional mixing valve is set to the hot water supply set temperature or the additional hot water supply. When the hot water temperature detected by the hot water temperature detection means is lower than a preset second temperature difference with respect to the hot water supply set temperature or the additional hot water supply set temperature, the first mixing is controlled. valve Water is set to the first outlet pipe side, and the outlet temperature of the second mixing valve or the additional mixing valve is controlled to the hot water supply set temperature or the additional hot water set temperature, which is detected by the hot water temperature detecting means. The hot water temperature is a temperature that is higher by the first temperature difference than the hot water supply set temperature or the additional hot water set temperature, and a temperature that is lower by the second temperature difference than the hot water set temperature or the additional hot water set temperature. The outlet temperature of the first mixing valve is controlled to the hot water supply set temperature or the additional hot water supply set temperature, and water entering the second mixing valve or the additional mixing valve is supplied to the primary mixed water pipe side or It is on the primary mixed water branch pipe side, and when there are a plurality of hot water outlets, there is an effect of improving the utilization effect of the hot water in the middle temperature layer by finely controlling according to the presence or absence of hot water.

In the fifth invention, in particular, when it is detected by the hot water supply presence / absence detecting means of the fourth invention that hot water is supplied to two or more of the hot water inlet and the additional hot water outlet, the hot water detected by the hot water temperature detecting means is detected. The first mixing is performed when the temperature is higher than a preset first temperature difference with respect to the highest hot water supply temperature or additional hot water set temperature corresponding to the hot water supply port and the additional hot water supply port. The inlet temperature of the second 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 set to the hot water set temperature and the additional hot water set temperature, respectively. The hot water temperature detected by the hot water temperature detecting means is previously set to the lowest one of the hot water supply set temperature or the additional hot water set temperature corresponding to the hot water supply port and the additional hot water supply port. Configuration When the temperature difference is lower than the second temperature difference, the water entering the first mixing valve is on the first hot water outlet side and the second hot water supply port and the second hot water supply port corresponding to the additional hot water supply port are provided. The outlet temperature of the mixing valve or the additional mixing valve is controlled to the hot water supply set temperature and the additional hot water supply set temperature, respectively, and the hot water temperature detected by the hot water temperature detecting means is the hot water supply port where the hot water is supplied and the additional hot water supply. For the lowest one of the hot water supply set temperature and the additional hot water supply set temperature corresponding to the mouth, the highest temperature by the first temperature difference, the hot water supply set temperature, and the additional hot water supply set temperature. When the temperature is lower than the second temperature difference, the outlet temperature of the first mixing valve is controlled to the lowest one of the hot water set temperature and the additional hot water set temperature, and the second mixing is performed. Primary entry into the valve The water mixing side is the primary mixing water branch pipe side for entering the additional mixing valve.When hot water is supplied from a plurality of hot water outlets simultaneously, while maintaining control of the hot water temperature, There is an effect that hot water can be used effectively.

In particular, the sixth invention is provided with a heating means for heating the water in the hot water storage tank of any one of the first to fifth inventions, and the heating means is a heat pump cycle, and the amount of hot water in the hot water storage tank. As a result, a low boiling temperature can be applied and effective characteristics can be maximized.

In the seventh aspect of the invention, in particular, the heat pump cycle of the sixth aspect of the invention heats water with a refrigerant whose high side pressure is increased to a critical pressure or more during operation, and can be used because the boiling temperature can be increased. Increase in the amount of heat that can be produced and the ability to prevent hot water shortage can be improved.

  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 first mixing valve 20 in which a pipe 4, a water supply branch pipe 19 branched from the water supply pipe 18, a first hot water discharge pipe 3 and a first water supply branch pipe 19 are connected to the inlet side, and a first A primary mixing water pipe 21 connected to the outlet side of the mixing valve 20, a second mixing valve 22 in which the second tapping pipe 4 and the primary mixing water pipe 21 are connected to the inlet side, and a second mixing valve 22 Secondary mixing water pipe 23 connected to the outlet side, hot water supply port 24 connected to the secondary mixing water pipe 23, and primary mixing A primary mixed water branch pipe 25 branched from the pipe 21, a second outlet pipe branch pipe 26 branched from the second outlet pipe, a primary mixed water branch pipe 25 and a second outlet pipe branch pipe 26; An additional mixing valve 27 connected to the inlet side, an additional secondary mixed water pipe 28 connected to the outlet side of the additional mixing valve 27, an additional hot water supply port 29 connected to the additional secondary mixed water pipe 28, and a second Hot water temperature detection means 30 for detecting the hot water temperature in the hot water storage tank 1 at the position where the hot water outlet pipe 4 is connected, hot water supply temperature setting means 7 for setting the hot water supply temperature of the hot water supply port 24 and the additional hot water supply port 29, and hot water temperature detection And a control device 32 having a control means 31 for controlling the first mixing valve 20, the second mixing valve 22 and the additional mixing valve 27 based on the output of the means 30 and the setting of the hot water supply temperature setting means 7. ing.

  The first mixing valve 20, the second mixing valve 22, and the additional mixing valve 27 are respectively provided on the outlet side with a first mixing valve outlet hot water temperature detection means 33 for hot water temperature control, Two mixing valve outlet hot water temperature detection means 34 and additional mixing valve outlet hot water temperature detection means 35 are provided.

  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 30 and the setting of the hot water supply temperature setting means 7, the first mixing valve 20 and the second mixing valve 22 and a control means 31 for controlling the additional mixing valve 27.

  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 hot water after boiling, the hot water in the hot water storage tank 1 discharged through the first hot water discharge pipe 3, the hot water obtained by mixing the hot water from the water supply pipe 18 with the first mixing valve 20, and the second The hot water in the hot water storage tank 1 discharged through the hot water discharge pipe 4 is mixed to the respective hot water supply set temperatures by the mixing valve 22 and the additional mixing valve 27 and supplied to the hot water supply port 24 or the additional hot water supply port 29. 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 temperature is set for each hot water supply port 24 and additional hot water supply port 29 by the hot water supply temperature setting means 7 as a hot water supply set temperature ts1 and an additional hot water supply set temperature ts2, respectively, 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 measured value by the hot water temperature detecting means 30, and the control means 31 controls the flow path of the first mixing valve 20 and the second mixing valve 22 based on this measured value.

  When the measured value tm by the hot water temperature detection means 30 is equal to or higher than the hot water supply set temperature ts1 (step 1 (S1)), the inlet side of the first mixing valve 20 is the side to which the water supply branch pipe 19 is connected. Open and the inlet side of the second mixing 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 mixing valve 20 opens the side to which the first hot water discharge pipe 3 is connected (step 4). (S4)). With the above operation, the water temperature on the inlet side of the second mixing valve 22 and the additional mixing valve 27 becomes higher and lower than ts1 and ts2, so that when the hot water is supplied through the hot water supply port 24, the control means 31. Controls the second mixing valve 22 so that the second mixing valve outlet hot water temperature detecting means 34 adjusts the flow rate ratio so as to be ts1 of the hot water supply set temperature (step 5 (S5)).

  Hot water adjusted to the hot water supply set temperature ts 1 is supplied from the hot water supply port 24 through the hot water supply pipe 23. When hot water is supplied from the additional hot water supply port 29, the control means 31 controls the additional mixing valve 27 and adjusts the flow rate ratio so that the additional mixing valve outlet hot water temperature detection means 35 becomes ts2 of the additional hot water supply set temperature. (Step 5).

  Next, when tm is between ts1 and ts2-10 ° C., that is, other than the conditions of Step 1 and Step 3, the primary mixed water pipe 21 is connected to the inlet side of the second mixing valve 22. The open side is opened (step 6 (S6)).

  When hot water is supplied from the hot water supply port 24 or the additional hot water supply port 29, the control means 31 controls the first mixing valve 20, and the first mixing valve outlet hot water temperature detection means 33 is ts2 of the hot water supply set temperature. The flow rate ratio is adjusted so as to become (Step 7 (S7)).

  Hot water adjusted to the hot water supply set temperature ts2 is supplied from the hot water supply port 24 through the primary mixed water pipe 21, the second mixing valve 22 and the secondary mixed water pipe 23, or from the primary mixed water branch pipe 25 and the second additional mixing valve. Hot water is supplied from an additional hot water outlet 29 through 27 and an additional hot water supply pipe 28.

  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 30 is controlled using 0 ° C. as a threshold, but the first mixing valve 20 and the second mixing valve 22 are controlled. In consideration of the controllability of the additional mixing valve 27 and the temperature drop in the piping, an arbitrary value may be added to ts1 in the equation 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 of 36 indicates that the upper end of the intermediate temperature layer 10 is at the connection position of the second hot water pipe 4 with the hot water tank 1, 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, the tapping water 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 lower 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 upward 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. 37 is a temperature distribution at the time when the intermediate temperature layer 10g passes the connection position of the second hot water discharge pipe 4. It should be noted that the temperature gradient is present in the portion of ts1 or more because the heat transfer from the hot water to the intermediate temperature layer 10 occurs with the passage of time while the intermediate temperature layer 10 passes through the connection position of the second tapping pipe 4. It depends.

  Thus, according to the first embodiment of the present invention, the hot water supply set temperature of the hot water supply port 24 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 29, and the hot water temperature By switching the flow path of the first mixing valve 20, the second mixing valve 22 and the additional mixing valve 25 based on the measurement value of the detection means 30, the intermediate temperature layer 10 can be effectively reduced and used. Since a decrease in the amount of hot water and a decrease in boiling efficiency in the heat pump unit 2 can be prevented, good usability and high energy saving can be realized.

  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 block diagram of a hot water supply apparatus according to the second embodiment of the present invention, and FIG. 6 is a flowchart of the operation of the hot water supply apparatus. 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 addition to the configuration in the first embodiment, the hot water supply apparatus in the present embodiment includes a first flow meter 38 serving as a hot water supply presence / absence detection unit in each of the secondary mixed water pipe 23 and the additional secondary mixed water pipe 28. A second flow meter 39 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 shows 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 38 and the second flow meter 39. First, the hot water supply set temperature ts1 at the hot water supply port 24 and the additional hot water supply set temperature ts2 at the additional hot water supply port 29 are compared (step 11 (S11)), and the lower value is set as the set temperature ts (step 12 (S12)). Step 13 (S13)).

  Next, when the first flow meter 38 detects hot water supply from the hot water supply port 24 (step 14 (S14)), and the second flow meter 39 also detects hot water supply from the additional hot water supply port 29 (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 lower 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 29 (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 24 is not detected in step 14 and hot water supply is detected in the additional hot water supply port 29 (step 20 (S20)), the additional hot water supply set temperature ts2 is set as the set temperature ts (step 21 (S21)). )).

When no hot water supply is detected at the hot water supply port 24 or the additional hot water supply port 29 (steps 14 and 20), the values employed in step 12 or step 13 are used as they are. Based on the set temperature ts thus determined, the same operation is performed by replacing ts1 and ts2 with ts in the valve control described in the first embodiment (flowchart in FIG. 3) (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 mixing valve 21 Primary mixing water pipe 22 Second mixing valve 23 Secondary mixing water pipe 24 Hot water supply port 25 Primary Mixed water branch pipe 26 Second outlet pipe branch pipe 27 Additional mixing valve 28 Additional secondary mixed water pipe 29 Additional hot water outlet 30 Hot water temperature detection means 31 Control means 33 First mixing valve outlet hot water temperature detection means 34 Second mixing Valve outlet hot water temperature detection means 35 Additional mixing valve outlet hot water temperature detection means 38 First flow meter (hot water supply presence / absence detection means)
39 Second flow meter (hot water supply presence / absence detection means)

Claims (7)

A hot water tank,
A first hot water pipe connected to the upper part of the hot water storage tank;
A water supply pipe connected to the lower part of the hot water tank;
A second hot water pipe connected between a position where the first hot water pipe is connected and a position where the water supply pipe is connected in the vertical direction of the hot water storage tank;
A water supply branch pipe branched from the water supply pipe;
A first mixing valve in which the first hot water outlet pipe and the feed water branch pipe are connected to the inlet side;
A primary mixing water pipe connected to the outlet side of the first mixing valve;
A second mixing valve in which the second tapping pipe and the primary mixed water pipe are connected to the inlet side;
A secondary mixing water pipe connected to the outlet side of the second mixing valve;
A hot water outlet connected to the secondary mixed water pipe;
A hot water temperature detecting means for detecting a 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 to be supplied from the hot water outlet,
Control means for controlling the operation of the first mixing valve and the second mixing valve based on the hot water set temperature set by the hot water supply temperature setting means and the detected temperature of the hot water temperature detecting means ; Prepared ,
The control means includes
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, the water enters the first mixing valve. And the outlet temperature of the second mixing valve is controlled to the hot water supply set temperature on the water supply branch 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 hot water supply set temperature, the water entering the first mixing valve is set to the first outlet pipe side. And controlling the outlet temperature of the second mixing valve to the hot water supply set temperature,
When the hot water temperature detected by the hot water temperature detecting means is between a temperature higher by the first temperature difference and a temperature lower by the second temperature difference than the hot water supply set temperature, the first mixing is performed. A hot water supply apparatus characterized in that the outlet temperature of the valve is controlled to the hot water supply set temperature, and the water entering the second mixing valve is on the primary mixed water pipe side . In addition to the hot water supply port, at least one additional hot water supply port is provided,
The hot water supply temperature setting means has an additional hot water supply set temperature for each additional hot water supply port,
Wherein in correspondence with each additional hot water port, a primary mixing water branch pipe diverged from the primary mixing water pipe, and a second hot water pipe branch pipe diverged from the second tapping pipe,
Wherein with said primary mixed water branching pipe second tapping pipe branch pipe and additional mixing valve connected to the inlet side, and a additional secondary mixing water pipe connected to the outlet side of said additional mixing valve,
The control means, wherein based on the hot water temperature setting set hot water temperature setting means and the additional hot water supply set temperature and the detected temperature of the hot water temperature detecting means, wherein the first mixing valve and the second mixing valve The hot water supply apparatus according to claim 1, wherein the operation of the additional mixing valve is controlled. If has been hot water detected by the water temperature detecting means first or temperature difference higher which is preset with respect to the hot water supply temperature setting the highest among the set hot water set temperature and the additional hot water temperature setting means to control the incoming water to the first mixing valve to the additional hot water set temperature to the outlet temperature as defined above hot water set temperature of the additional mixing valve and the second mixing valve with a water supply branch pipe side,
The first mixing valve 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 set temperature. incoming water was controlled to the first, respectively the hot water set temperature and the additional hot water set temperature to the outlet temperature of the second mixing valve with the additional mixing valve with a hot water pipe side to,
The hot water temperature detected by the hot water temperature detecting means is higher by the first temperature difference than the highest one of the hot water supply set temperature and the additional hot water set temperature, the hot water set temperature and the additional hot water set. When the temperature is lower than the lowest temperature by the second temperature difference, the outlet temperature of the first mixing valve is the lowest of the hot water supply set temperature and the additional hot water supply set temperature. the water inlet to the second mixing valve and the primary mixing water pipe side controls to, characterized in that the water inlet to the additional mixing valve and configured to the primary mixing water branch pipe side claim 2 The hot water supply device described in 1. The hot water supply presence detection means for detecting the presence or absence of hot water to each of said additional secondary mixed water pipe and the secondary mixing water pipe provided,
The control means includes
In response to the hot water supply port or said additional hot-water supply port it is detected that is hot water by the hot water supply presence detection means, is hot water is detected temperature set by the hot water supply temperature setting means by the water temperature detecting means and the If the first or the temperature difference higher which is previously set hot water supply temperature setting or the additional hot water set temperature, the second mixing valve with a water inlet to the first mixing valve and the water supply branch pipe side or by controlling the outlet temperature of the additional mixing valve to the hot water supply set temperature or the additional hot water set temperature,
If it has been hot water detected by the water temperature detecting means and the second temperature difference or more low set in advance with respect to the hot water supply set temperature or the additional hot water set temperature, said water inlet to the first mixing valve Controlling the outlet temperature of the second mixing valve or the additional mixing valve to the first hot water supply pipe side or the additional hot water supply setting temperature,
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 temperature. When the temperature is lower by the second temperature difference, the outlet temperature of the first mixing valve is controlled to the hot water supply set temperature or the additional hot water supply set temperature, and the second mixing valve or the additional mixing valve water heater according to claim 2 in which the incoming water is characterized in that a configuration in which said primary mixing water pipe side or the primary mixing water branch pipe side to. The hot water supply if it is hot water in two or more of the additional hot water supply port and the hot water supply port by the hot water presence detection means is detected, the hot water temperature is detected by the water temperature detecting means, which is hot water If the first or the temperature difference higher which is previously set highest among the hot water set temperature or the additional hot water set temperature corresponding to the mouth and the additional hot water supply port, said first
Wherein each of the hot water set temperature to the outlet temperature of the second mixing valve the additional mixing valve the incoming water corresponding to the additional hot water outlet the hot water supply port, which is hot water and with a the water supply branch pipe side of the mixing valve And control to the additional hot water set temperature,
The hot water temperature detected by the hot water temperature detecting means is preset for the lowest one of the hot water supply set temperature or the additional hot water set temperature corresponding to the hot water supply port and the additional hot water supply port. If the second temperature difference or lower, the first of the second mixing of the hot water supply port, which is hot water with the water inlet and the first tapping pipe side and corresponding to the additional hot water outlet of the mixing valve Control the outlet temperature of the valve or the additional mixing valve to the hot water set temperature and the additional hot water set temperature, respectively
The first 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 set temperature corresponding to the hot water supply port being supplied and the additional hot water supply port. When the temperature is higher by a temperature difference, the hot water supply set temperature, and the additional hot water set temperature than the lowest temperature by the second temperature difference, the outlet temperature of the first mixing valve is wherein the water inlet to the second mixing valve and the primary mixing water pipe side, the primary mixing water branch pipe incoming water to the additional mixing valve controls the lowest ones of the hot water set temperature and the additional hot water set temperature The hot water supply device according to claim 4 , wherein the hot water supply device is configured as a side. The hot water supply apparatus according to any one of claims 1 to 5 , wherein heating means for heating water in the hot water storage tank is provided, and the heating means is a heat pump cycle. The hot water supply apparatus according to claim 6 , wherein the heat pump cycle is configured to heat water with a refrigerant whose high side pressure is increased to a critical pressure or more during operation.

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