JP5200842B2 - Water heater - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a hot water supply apparatus that stores heat in a tank so that the amount of heat can be replenished with combustion-type heating means when the amount of heat in the hot water in the bathtub is insufficient. .

As a prior art, there is a hot water supply device disclosed in Patent Document 1 below. This hot water supply apparatus is provided with a combustion burner which is a combustion type heating means in a tapping pipe from a tank, and the hot water discharged from the tank can be heated by the combustion burner to raise the temperature of the hot water.
JP 2000-329401 A

  However, in the conventional hot water supply apparatus, when the hot water discharged from the tank is at a medium temperature that is lower than the high temperature and slightly below the set temperature of the hot water in the bathtub, the medium temperature hot water is heated by the heating means. If the hot water filling temperature is exceeded and a large amount of water is not mixed, there is a problem that hot water at the preset temperature cannot be filled in the bathtub and the hot water in the tank cannot be used effectively.

  This is because the heating means provided in the tapping pipe is a combustion type, and even if the combustion amount is reduced, there is a lower limit of the combustion amount in order to continue the stable combustion state. This is because there is a restriction that an output lower than that cannot be obtained.

  This problem is not limited to the type of hot water supply device that discharges hot water directly from the tank, but is an indirect hot water supply device that heats hot water for filling the bathtub by heat exchange with the heat medium derived from the tank. It is what you have.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a hot water supply apparatus that can effectively use medium-temperature hot water or a heat medium in a tank.

In order to achieve the above object, in the invention described in claim 1,
A tank (2) for storing a heat medium therein;
Temperature detection means (TH1) for detecting the temperature of the upper heating medium in the tank (2);
A hot water supply heat exchanger (3) for heating hot water for filling the bath (90) by heat exchange with a heat medium from the tank (2);
Combustion-type heating means (4) for heating either the heat medium stored in the tank (2) or the hot water flowing out of the hot water supply heat exchanger (3);
Reheating means (41) for reheating and heating the hot water after filling in the bathtub (90);
Control means (100) for controlling the operation of the combustion heating means (4) and the reheating means (41) based on the temperature detected by the temperature detection means (TH1) when hot water is filled in the bathtub (90). And comprising
The control means (100)
When the detected temperature of the temperature detecting means (TH1) is equal to or higher than the first predetermined temperature determined based on the hot water filling temperature in the bathtub (90), the heating means (4) and the reheating means (41) Hot water is heated with a heat medium derived from the tank (2) while prohibiting operation, and the bath (90) is filled with water
When the temperature detected by the temperature detection means (TH1) is less than the first predetermined temperature and is equal to or higher than a second predetermined temperature determined based on the temperature of the water supplied to the hot water supply heat exchanger (3) , the heating means While prohibiting the operation of (4), hot water is heated with a heat medium derived from the upper part of the tank (2) to fill the bathtub (90), and after the hot water is filled, the reheating means (41) is operated to operate the bathtub. The hot water in (90) is set to a hot water filling set temperature.

According to this, when there is a heat medium in the tank (2) having a temperature higher than the first predetermined temperature that can be filled in the bathtub (90) at the preset filling temperature, the combustion heating means (4) and the additional heating means are added. in the heat medium derived from the tank (2) without operating means (41) fired by heating the hot water to hot water filling in the bathtub (90), the first predetermined temperature less than, and the hot water supply heat exchanger ( In the case where only the medium temperature heat medium not lower than the second predetermined temperature determined based on the feed water temperature to 3) is in the tank (2), the combustion type heating means (4) is operated without operating the tank (2). Hot water is heated in the bathtub (90) with the heat medium derived from the upper part, and after the hot water is filled, the hot water in the bathtub (90) is reheated to the hot water set temperature by the reheating means (41). Can do.

  If the combustion type heating means (4) is operated at the minimum heating capacity and high temperature hot water exceeding the hot water set temperature is generated, a large amount is required to lower the hot water temperature to the hot water set temperature. Therefore, the amount of heat used by the medium temperature heat medium is reduced. However, according to the present invention, the combustion type heating means (4) is not operated at the minimum heating capacity to generate hot hot water exceeding the hot water setting temperature. It is possible to effectively use the heat medium.

Generally, the temperature of the feed water is lower than the temperature of hot water that exceeds the preset hot water temperature when the combustion-type heating means (4) is operated and heated with the minimum heating capacity. Therefore, when the temperature of the upper portion of the heating medium in the tank (2) is equal to or less than the first predetermined temperature below and the second predetermined temperature, i.e., hot water filling preset to be operated combustion type heating means (4) If only hot water below the temperature can be obtained and the combustion type heating means (4) is operated at the minimum heating capacity, hot water exceeding the hot water setting temperature is generated. Without operation, hot water is heated with a heat medium derived from the upper part of the tank (2) to fill the tub (90), and after filling, the hot water in the tub (90) is heated by the reheating means (41). It is possible to heat up to the preset temperature. Therefore, the medium temperature heat medium in the tank (2) can be used effectively.

In the invention according to claim 2 ,
The control means (100)
Even if the amount of heat of the heat medium stored in the tank (2) prohibits the operation of the combustion-type heating means (4) and the reheating means (41), hot water with a hot water filling temperature is set in the bathtub (90). Judge whether it is more than the amount of heat that can be filled,
When the temperature detected by the temperature detecting means (TH1) is equal to or higher than the first predetermined temperature and the amount of heat of the heat medium stored in the tank (2) is equal to or higher than the amount of heat that can be filled, the heating means (4 ) And the reheating means (41) while prohibiting operation, the hot water is heated with the heat medium derived from the tank (2) to fill the bathtub (90),
When the temperature detected by the temperature detecting means (TH1) is less than the first predetermined temperature or the amount of heat of the heat medium stored in the tank (2) is less than the amount of heat that can be filled, the heating means (4) While the operation is prohibited, the hot water is heated with the heat medium derived from the upper part of the tank (2) to fill the bath (90), and after the hot water is filled, the reheating means (41) is operated to fill the bath (90). It is characterized in that the hot water is set to a preset temperature.

  According to this, even when the temperature of the heat medium in the upper part in the tank (2) does not operate the combustion-type heating means (4), even when hot water having a hot water filling set temperature is obtained, the tank (2) When the amount of heat of the heat medium inside is insufficient for the amount of heat necessary to complete the filling of the set temperature, the heat derived from the upper part of the tank (2) without operating the combustion heating means (4) Hot water is heated in the bath (90) with a medium, and after hot water filling, the hot water in the bathtub (90) can be reheated to the hot water set temperature by the reheating means (41). Therefore, the medium-temperature heat medium in the tank (2) can be effectively used more reliably.

In the invention according to claim 3 ,
A circulation circuit (8) for guiding the heat medium in the upper part in the tank (2) to the lower part in the tank (2) via the primary passage (3a) of the hot water supply heat exchanger (3);
Circulation means (9) for circulating a heat medium in the circulation circuit (8),
The control means (100) allows the temperature of the heat medium flowing out from the primary passage (3a) of the hot water supply heat exchanger (3) to flow into the secondary passage (3b) of the hot water supply heat exchanger (3). The circulating amount of the heat medium is adjusted by controlling the operating state of the circulating means (9) so as to approach a predetermined temperature determined based on the temperature of the supplied water and the heat exchange performance of the hot water heat exchanger.

  According to this, the temperature of the heat medium that exchanges heat with the hot water supply water in the hot water supply heat exchanger (3) and returns to the tank (2) can be made relatively low, and the medium temperature heat medium can be used more effectively. Can do.

Further, the invention described in claim 4 is characterized by comprising a heat pump device (1) for boiling up the heat medium in the lower part of the tank (2) and storing it in the upper part of the tank (2).

  When the heating medium boiling means is the heat pump device (1), the lower the temperature of the heating medium before boiling, the better the operating efficiency (COP). Therefore, in the hot water supply apparatus that can effectively use the medium-temperature heat medium, the heat medium is boiled by the heat pump apparatus (1), so that the efficiency is extremely good.

In the invention according to claim 5 ,
A tank (2) for storing hot water for filling in the bathtub (90);
Temperature detection means (TH1) for detecting the temperature of hot water in the upper part of the tank (2);
Combustion-type heating means (4) for heating the hot water before filling in the bathtub (90);
Reheating means (41) for reheating and heating the hot water after filling in the bathtub (90);
Control means (100) for controlling the operation of the combustion heating means (4) and the reheating means (41) based on the temperature detected by the temperature detection means (TH1) when hot water is filled in the bathtub (90). And comprising
The control means (100)
When the detected temperature of the temperature detection means (TH1) is equal to or higher than a first predetermined temperature determined based on the hot water filling temperature in the bathtub (90), the combustion heating means (4) and the reheating means ( 41) The hot water discharged from the tank (2) is filled in the bathtub (90) while prohibiting the operation of 41),
When the temperature detected by the temperature detecting means (TH1) is lower than the first predetermined temperature and is equal to or higher than the second predetermined temperature determined based on the temperature of the water supplied to the tank (2) , the heating means (4) The hot water discharged from the upper part of the tank (90) is filled in the bathtub (90) while the operation is prohibited, and the hot water (41) is driven after the hot water is filled to set the hot water in the bathtub (90). It is characterized by temperature.

According to this, when there is hot water in the tank (2) that is hotter than the first predetermined temperature that can be filled in the bathtub (90) at the preset temperature, the combustion heating means (4) and the reheating the hot water was tapped from the tank (2) without operating means (41) and hot water filling the bathtub (90), the first predetermined temperature less than, and determined based on the water temperature of the tank (2) the 2 If there is only medium-temperature hot water in the tank (2) above a predetermined temperature , the hot water discharged from the upper part of the tank (2) without operating the combustion heating means (4) is placed in the bathtub (90). After hot water filling, the hot water in the bathtub (90) can be reheated to the hot water set temperature by the reheating means (41).

  If the combustion type heating means (4) is operated at the minimum heating capacity and high temperature hot water exceeding the hot water set temperature is generated, a large amount is required to lower the hot water temperature to the hot water set temperature. It is necessary to mix water, and the amount of medium-temperature hot water used will be reduced. However, according to the present invention, the combustion type heating means (4) is not operated at the minimum heating capacity to generate hot hot water exceeding the hot water setting temperature. Can be used effectively.

Generally, the temperature of the feed water is lower than the temperature of hot water that exceeds the preset hot water temperature when the combustion-type heating means (4) is operated and heated with the minimum heating capacity. Therefore, if the temperature of hot water in the upper portion of the tank (2) is equal to or less than the first predetermined temperature below and the second predetermined temperature, i.e., hot water filling preset temperature to be operated combustion type heating means (4) When the combustion type heating means (4) is operated at the minimum heating capacity and hot water exceeding the preset hot water temperature is generated, the combustion type heating means (4) is operated. The hot water discharged from the upper part of the tank (2) is filled in the bathtub (90) without being heated, and after the hot water is filled, the hot water in the bathtub (90) is reheated to the set temperature by the reheating means (41). Is possible. Therefore, the medium temperature hot water in the tank (2) can be used effectively.

In the invention according to claim 6 ,
The control means (100)
Even if the amount of hot water stored in the tank (2) prohibits the operation of the combustion-type heating means (4) and the reheating means (41), hot water at a set temperature is poured into the bathtub (90). Judge whether it is more than the amount of heat that can be tensioned,
When the temperature detected by the temperature detection means (TH1) is equal to or higher than the first predetermined temperature and the amount of hot water stored in the tank (2) is equal to or higher than the amount of heat that can be filled, the heating means (4) And hot water discharged from the tank (2) while prohibiting the operation of the reheating means (41) is filled in the bathtub (90),
When the temperature detected by the temperature detection means (TH1) is less than the first predetermined temperature or the amount of hot water stored in the tank (2) is less than the amount of heat that can be filled, the operation of the heating means (4) is performed. The hot water discharged from the upper part of the tank (2) is filled in the bathtub (90), and the reheating means (41) is operated after filling the hot water in the bathtub (90). It is characterized by that.

  According to this, even when the temperature of the hot water in the upper part of the tank (2) can be obtained without the operation of the combustion type heating means (4), When the amount of water in the hot water is insufficient to the amount of heat necessary to complete the filling of the set temperature, the hot water discharged from the upper part of the tank (2) without operating the combustion heating means (4) (90) The hot water is filled in, and after the hot water is filled, the hot water in the bathtub (90) can be reheated to the hot water set temperature by the reheating means (41). Therefore, the hot water in the tank (2) can be effectively used more reliably.

Moreover, in invention of Claim 7 , it has the heat pump apparatus (1) for boiling up the hot water of the lower part in a tank (2), and storing it in the upper part in a tank (2), It is characterized by the above-mentioned.

  When the hot water boiling means is the heat pump device (1), the lower the temperature of the hot water before boiling, the better the operating efficiency (COP). Therefore, in the hot water supply apparatus that can effectively use the hot water of medium temperature, the hot water is boiled by the heat pump device (1), so the efficiency is extremely good.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those described previously. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

(First embodiment)
A first embodiment to which the present invention is applied will be described with reference to FIGS. Drawing 1 is a mimetic diagram showing the schematic structure of the hot-water supply device of a 1st embodiment. FIG. 2 is a block diagram showing a control configuration related to the hot water supply apparatus.

  The hot water supply apparatus of this embodiment is a hot water storage type heat pump type hot water supply apparatus, which is mainly used for general household use, and hot water for heat storage (heat medium for heat storage) stored in the hot water storage tank 2. The hot water supply heat exchanger 3 exchanges heat with the hot water supply water, and the heated hot water supply (hot water) is supplied to hot water supply terminals (hand-washing faucets, currants, showers, baths, etc.) to the kitchen, washroom, bathroom, etc. In addition, when a predetermined condition is satisfied, the auxiliary heat source device 4 has a function of further heating the hot water supply water to adjust the temperature.

  As shown in FIG. 1, the hot water supply device includes a heat pump unit 1 (heat pump device) that is a heating means that heat-exchanges high-temperature and high-pressure refrigerant to boil hot water, and a hot water storage tank that stores the hot water heated by the heat pump unit 1. 2 (corresponding to a tank), low-temperature water in the lower part of the hot water storage tank 2 flows out, is heated by the heat pump unit 1 and returns to the upper part of the hot water storage tank 2, and a heat storage circulation circuit 6 A hot water supply heat exchanger 3 for exchanging heat between the hot water and the hot water supply water, an auxiliary heat source device 4 (corresponding to a heating means) that can further heat the hot water heated by the hot water heat exchanger 3, And a control device 100 (see FIG. 2) for controlling the operation of the hot water supply device.

  The heat pump unit 1 is configured such that at least refrigeration cycle functional components such as a compressor, a heat storage heat exchanger, an expansion valve, an evaporator, and an accumulator are connected in a ring shape. The heat pump unit 1 constitutes a supercritical heat pump cycle in which, for example, carbon dioxide having a low critical temperature is used as a refrigerant, whereby the refrigerant pressure on the high pressure side becomes equal to or higher than the critical pressure of the refrigerant.

  When the heat pump cycle is constituted by a supercritical heat pump, hot water having a temperature higher than that of a general heat pump cycle, for example, about 85 ° C. to 90 ° C. can be stored in the hot water storage tank 2. The heat pump cycle mainly performs a boiling operation in which hot water in the hot water storage tank 2 is boiled using late-night power in the late-night time zone, which is inexpensively set.

  The compressor of the heat pump cycle 1 is driven by electric energy in this example, but is not limited to this, and may be driven by gas, kerosene, or the like.

  In the heat storage circulation circuit 6, an incoming temperature thermistor for detecting the temperature of water supplied to the water-refrigerant heat exchanger, which is a heat storage heat exchanger in the heat pump unit 1, and a water-refrigerant heat exchanger outlet A boiling temperature thermistor for detecting the boiling temperature and an electric pump are provided. Further, the heat pump unit 1 is provided with an outside air temperature thermistor 23 for detecting the temperature of the outside air before passing through the outside of the evaporator. Then, the detected temperature signal of each thermistor is output to the control device 100.

  The hot water storage tank 2 is a vertically long container that stores hot water that is a heat storage fluid (corresponding to a heat medium) that heats hot water supply water, and is made of a metal excellent in corrosion resistance, for example, stainless steel. A material is provided, and hot water can be kept warm for a long time. In addition, the heat storage fluid is mainly composed of water, and may contain a preservative, an antifreezing agent, LLC, and the like. In addition, the heat storage fluid may be a mixture of heat storage materials having cross specific heat, such as microcapsules, dispersed in water and mixed, or may be mixed in a thriller form.

  The hot water in the hot water storage tank 2 is circulated by the operation of the electric pump of the heat storage circulation circuit 6. Thus, the hot water in the hot water storage tank 2 heated by the heat storage heat exchanger is sent to the upper part of the hot water storage tank 2 through the heat storage circulation circuit 6, so that the upper side in the hot water storage tank 2 is moved to the lower side. The heat is sequentially stored so as to form a plurality of temperature layers.

  The hot water supply heat exchanger 3 includes a primary side passage 3a and a secondary side passage 3b provided so that fluids flowing inside each other exchange heat. The primary side passage 3a is a flow path that communicates with the hot water storage tank 2 and through which hot water in the hot water storage tank 2 flows. The secondary side passage 3b is a flow path in which an upstream end is connected to the water supply pipe 10, and a downstream end is connected to the hot water supply pipe 13, and a flow path through which hot water supplied to the hot water supply terminal flows. is there. The primary side passage 3a and the secondary side passage 3b may have any form in which heat is exchanged between fluids flowing through the passages. For example, you may comprise by the double pipe structure in which one channel | path is formed in an inner side pipe | tube and the other channel | path is formed in the outer side pipe | tube which covers the outer side of an inner side pipe | tube. Moreover, it is preferable that the hot water supply heat exchanger 3 is an opposed heat exchanger in which the flow directions of the fluid flowing through the primary side passage 3a and the secondary side passage 3b are opposed to each other.

  The hot water storage tank 2 is connected to the primary side passage 3a so as to form a primary side circulation circuit 8 (corresponding to a circulation circuit) which is a circulation passage with the primary side passage 3a of the heat exchanger 3 for hot water supply. Has been. The primary side circulation circuit 8 is connected to a lead-out port provided at the uppermost part (upper part) of the hot water storage tank 2, and a heat exchanger inlet temperature is connected to a flow path connecting the lead-out port and the primary side passage 3a. The primary side heat exchanger inlet temperature thermistor 18 is detected.

  Further, the primary side circulation circuit 8 is connected to an introduction port provided at the lowermost part of the hot water storage tank 2, and the hot water storage from the primary side passage 3 a is connected to a flow path connecting the introduction port and the primary side passage 3 a. A primary-side circulation return temperature thermistor 19 that detects the outlet temperature of the primary-side heat exchanger of the heat-storage fluid flowing out toward the lower part of the tank 2, and the heat-storage fluid is forcibly circulated to the primary-side circulation circuit 8. And a circulation pump 9 (corresponding to a circulation means) that is a heat storage fluid drive means. The temperature signals detected by the primary heat exchanger inlet temperature thermistor 18 and the primary circulation return temperature thermistor 19 are input to the input circuit of the control device 100.

  Upstream of the water supply pipe 10 is connected to a water pipe, and city water (tap water) is introduced into the secondary passage 3b of the heat exchanger 3 for hot water supply. The water supply pipe 10 is provided with a flow rate detector 16 and a water supply temperature thermistor 20. The flow rate detector 16 is detection means for detecting a flow rate (secondary flow rate) in the direction of the secondary passage 3b, and the feed water temperature thermistor 20 detects the temperature of city water, and the detected flow rate signal and temperature signal. Is input to the input circuit of the control device 100.

  The hot water supply pipe 13 is a pipe that connects the outlet of the secondary side passage 3b of the hot water supply heat exchanger 3 and a hot water supply terminal (hand-washing faucet, currant, shower, bath, etc.) to the kitchen, washroom, bathroom, and the like. A hot water supply thermistor 22 that detects a hot water supply temperature and a flow rate counter (not shown) are provided on the downstream side of the hot water supply pipe 13. The hot water supply temperature signal and the flow rate signal detected by the hot water supply thermistor 22 and the flow rate counter are input to the input circuit of the control device 100.

  The hot water supply pipe 13 includes a secondary side outlet temperature thermistor 21 (secondary outlet temperature detection) that detects the temperature of hot water at the outlet of the secondary side passage 3b of the hot water supply heat exchanger 3 (heat exchanger secondary outlet temperature). Device). The detected heat exchanger secondary outlet temperature is input to the input circuit of the control device 100. Further, the hot water supply pipe 13 includes a branch portion where the hot water supply pipe 13 branches to the auxiliary heat source passage 15 on the downstream side of the secondary side outlet temperature thermistor 21, and the heat source switching valve 11 is provided in the branch portion. Is provided. The heat source switching valve 11 can switch the hot water supply water that has flowed out of the secondary side passage 3b to flow through either the hot water supply pipe 13 side or the auxiliary heat source passage 15 side.

  In the middle of the auxiliary heat source passage 15, there is provided an auxiliary heat source device 4 for reheating the hot water supply water flowing through the auxiliary heat source passage 15, and the downstream end of the auxiliary heat source passage 15 joins the hot water supply pipe 13. ing. In this example, the auxiliary heat source 4 heats hot water supply water with city gas. However, the auxiliary heat source device 4 is particularly limited as long as it is a device (combustion heating means) capable of heating the hot water supply water passing by burning fuel. For example, a small gas water heater that heats hot-water supply water that passes through the inside using a combustion flame made of a fuel such as gas, and a small heat-up water that passes through the interior using a combustion flame made up of liquid fuel such as kerosene A petroleum water heater or the like can be employed.

  The water supply pipe 10 branches before the secondary passage 3 b of the hot water supply heat exchanger 3, and the branched pipe joins the hot water supply pipe 13. A pipe from the branch portion of the water supply pipe 10 to the junction of the hot water supply pipe 13 is a secondary bypass passage 14 that bypasses the hot water supply heat exchanger 3. A hot water supply mixing valve 12 is provided at the junction of the secondary bypass passage 14 and the hot water supply pipe 13.

  This hot water supply mixing valve 12 is a temperature adjustment valve that adjusts the temperature of hot water discharged to the hot water supply terminal side, and by adjusting the opening area ratio between the hot water supply pipe 13 side and the secondary side bypass passage 14 side, Control is performed to adjust the mixing ratio of the hot water supply water heated by the heat exchanger 3 and the city water to the set temperature. The control device 100 controls the hot water mixing valve 12 based on the temperature set by the remote controller 110 or the like and the temperature information detected by the feed water temperature thermistor 20, the secondary outlet temperature thermistor 21 and the hot water temperature thermistor 22. To do.

  The hot water supply pipe 13 branches downstream of the hot water supply mixing valve 12, and the downstream end of the branched hot water supply pipe 13 a goes to the bath water circulation circuit 40 that circulates the bath water in the bathtub 90 to the memorial heat source 41. It is connected to the tube 40a. The bath hot water supply pipe 13a is provided with a bath electromagnetic valve 43 for opening and closing the hot water supply path.

  In this example, the reheating heat source device 41 which is a reheating means replenishes and heats the bath water with city gas, but can reheat the bath water supplied via the return pipe 40b of the bath water circulation circuit 40. It is not particularly limited as long as it is a device, for example, a small gas water heater that heats hot-water supply water that passes through the inside using a combustion flame with a fuel such as gas, or a gas that passes through the inside with a combustion flame that uses liquid fuel such as kerosene. It is possible to employ a small petroleum water heater, an electric heater, or the like that heats water for hot water supply.

  The memorial heat source device 41 is a heat source device that is outside the hot water storage tank 2 and is thermally isolated from the hot water storage tank 2. That is, the reheating heat source device 41 is a heat source device that does not involve a change in the amount of heat in the hot water storage tank 2 such as using the amount of heat in the hot water storage tank 2 when reheating the bath water.

  In FIG. 1, the additional heat source device 41 is illustrated separately from the auxiliary heat source device 4, but the additional heat source device 41 may be integrated with the auxiliary heat source device 4, and a combustion heating unit of the auxiliary heat source device 4. And the combustion heating part of the memory heat source device 41 may be shared.

  Of the bath water circulation circuit 40, the return pipe 40 b that guides the bath water in the bath 90 to the memorial heat source 41 is connected to the temperature of the bath water supplied to the memorial heat source 41 (that is, the bath water in the bath 90. A bath water temperature thermistor 24 for detecting (temperature) is provided. On the other hand, in the bath water circulation circuit 40, an additional pipe 40 a that guides the bath water reheated by the reheating heat source device 41 to the inside of the bathtub 90 is detected to detect the temperature of the bath water heated by the reheating heat source device 41. A soot temperature thermistor 25 is provided. The temperature signals detected by the bath water temperature thermistor 24 and the tracking temperature thermistor 25 are input to the control device 100.

  Further, the bath water circulation circuit 40 is provided with a bath water circulation pump 42 which is a bath water fluid driving means for forcibly circulating the bath water in the bath water circulation circuit 40 so that the drive is controlled by the control device 100. It has become.

  The outer wall surface of the hot water storage tank 2 is provided with a plurality of hot water storage thermistors 17 which are water temperature sensors for detecting the amount of hot water for storing hot water and the temperature of the hot water storage. Five thermistors TH1, TH2, TH3, TH4, and TH5 are arranged in order from the top (upper part) of the hot water storage tank 2. The detected temperature signals of these five thermistors are respectively input to the input circuit of the control device 100, and can detect the temperature of the heat storage fluid and the amount of hot water at each water level. Moreover, TH1 located in the uppermost part among the plurality of hot water storage thermistors 17 can detect the temperature of hot water discharged from the hot storage fluid.

  TH1 provided at the top of the hot water storage thermistor 17 corresponds to temperature detecting means for detecting the temperature of the uppermost heat medium in the tank, and the plurality of hot water storage thermistors 17 comprising TH1 to TH5 are provided in the hot water storage tank 2. It can be said that it is a calorific value detection means for detecting the calorific value of the heat medium stored in. Here, it has been described that the temperature of the uppermost heat medium in the tank is detected, but the uppermost portion in the tank may be a substantially uppermost portion. In other words, any device that detects the temperature of the heat medium at the upper position that can be derived from the inside of the tank may be used.

  An indirect tank 5 for supplying city water in the hot water storage tank 5 is placed on the top surface of the hot water storage tank 2. A water supply pipe through which city water flows and an escape pipe are connected to the upper part of the indirect tank 5, and a circulation pipe 7 connected to the lower part of the hot water storage tank 2 is connected to the lower part of the indirect tank 5. . A water level sensor is provided in the indirect tank 5, and water is automatically supplied into the indirect tank 5 by a detection signal of the water level sensor transmitted to the control device 100. When the water flowing through the water supply pipe is stored in the indirect tank 5, the water in the indirect tank 5 flows into the lower part of the hot water storage tank 2 through the circulation pipe 7, and excess water is released through the pipe for escape. It is discharged to the outside through.

  As shown in FIG. 2, the control device 100 as a control means includes an input circuit to which signals from various switches on the remote controller 110, communication signals from the flow rate detector 16 and various thermistors 17 to 25 are input, A microcomputer that executes various calculations using signals from the circuit, and a heat pump unit 1, an auxiliary heat source unit 4, a circulation pump 9, a heat source switching valve 11, a hot water supply mixing valve 12, a reheating heat source based on the calculation by the microcomputer And an output circuit for outputting a communication signal for controlling the bath 41, the bath water circulation pump 42, the bath solenoid valve 43, and the like. The microcomputer incorporates a ROM or RAM as storage means and has a preset control program and an updatable control program.

  Next, the operation of the hot water supply apparatus having the above configuration will be described. First, boiling control of the hot water supply device will be described. When the hot water supply switch of the remote controller 110 is turned on by the user, the control device 100 mainly uses a heat pump in the late-night time zone (for example, the time zone from 23:00 on the current day to 7 o'clock on the next day) where the power rate is inexpensive. The unit 1 is operated, the heat storage fluid in the hot water storage tank 2 is heated, and a necessary amount of heat is stored.

  That is, when the hot water storage thermistor detects that the necessary amount of heat does not remain in the hot water storage tank 2 the next day in the midnight power time zone, the control device 100 instructs the heat pump unit 1 to start boiling. The heat pump unit 1 that has received the command starts driving the circulation pump of the heat storage circulation circuit 6 after starting the compressor, and the low-temperature water taken out from the lower part of the hot water storage tank 2 is about 70 to 90 ° C. with a water-refrigerant heat exchanger. The hot water is heated to a high temperature, returned to the hot water storage tank 2 from the upper part of the hot water storage tank 2 through the heat storage circulation circuit 6, and sequentially stacked from the upper part of the hot water storage tank 2 to store the hot water. When the hot water storage thermistor 17 detects that the necessary amount of heat has been stored, the control device 100 commands the heat pump unit 1 to stop boiling, and the heat pump unit 1 stops the compressor and also stops the circulation pump. End boiling operation.

  Next, control when hot water is filled in the bathtub 90 will be described with reference to FIG. FIG. 3 is a flowchart showing a schematic control operation of the filling operation control performed by the control device 100.

  As shown in FIG. 3, the control device 100 first determines whether or not the temperature detected by the uppermost thermistor TH1 of the hot water storage thermistor 17 is equal to or higher than the hot water filling set temperature + 10 ° C. (step S120). Here, the hot water filling set temperature + 10 ° C. corresponds to a first predetermined temperature determined based on the hot water filling set temperature. If the detected temperature of TH1 is equal to or higher than the hot water filling temperature + 10 ° C., the first hot water filling mode is executed in which hot water filling is performed at the set temperature only by the amount of hot water stored in the hot water storage tank 2 (step S130).

  In the first hot water filling mode, the bath solenoid valve 43 is opened, the hot water flow path of the heat source switching valve 11 is set to the hot water supply pipe 13 side without operating the auxiliary heat source device 4, and the detected temperature of the secondary outlet temperature thermistor 21 is The circulating pump 9 is driven by feedback control so that the hot water filling set temperature is + 5 ° C. Further, the opening area ratio of the hot water mixing valve 12 is adjusted so that the detected temperature of the hot water temperature thermistor 22 becomes the hot water set temperature, and hot water (hot water water) heated by the hot water heat exchanger 3 and city water Mix.

  Accordingly, as shown in FIG. 4, the heat storage fluid derived from the uppermost portion of the hot water storage tank 2 passes through the secondary side passage 3 b when passing through the primary side passage 3 a of the hot water supply heat exchanger 3. Heat city water. For example, when the detected temperature of TH1 is 60 ° C. and the hot water filling temperature is 43 ° C., the heat storage fluid is circulated so that the temperature of the hot water flowing out from the secondary passage 3b is 48 ° C. In the hot water supply mixing valve 12, for example, 9 ° C. city water is mixed with 48 ° C. hot water flowing through the hot water supply pipe 13 to form 43 ° C. hot water and set in the bathtub 90 through the bath hot water supply pipe 13 a and the forward pipe 40 a. Hot water filling is performed to the amount. The hot water filling into the bathtub 90 may be performed not only from the forward pipe 40a but also from the return pipe 40b via the stopped bath water circulation pump 42 in addition to the forward pipe 40a.

  In FIG. 4, a path through which the fluid flows is indicated by a solid line, and a path that does not flow is indicated by a broken line. The same applies to FIGS. 5 to 7 below.

  If it is determined in step S120 that the detected temperature of TH1 is lower than the hot water set temperature + 10 ° C., it is determined whether or not the detected temperature of TH1 is equal to or higher than the average water supply temperature + 10 ° C. (step S140). Here, the average water supply temperature + 10 ° C. corresponds to a second predetermined temperature determined based on the water supply temperature to the hot water supply heat exchanger. The average water supply temperature is an average value of temperatures detected by the water supply temperature thermistor 20 during a predetermined period in the past.

  If the detected temperature of TH1 is equal to or higher than the average water supply temperature + 10 ° C., first, the second hot water filling mode is executed in which hot water filling at a low temperature lower than the set temperature is performed only by the amount of hot water stored in the hot water storage tank 2 (step S150). Next, the reheating operation by the reheating heat source device 41 is performed (step S160).

  In the second hot water filling mode, the bath electromagnetic valve 43 is opened, the hot water flow path of the heat source switching valve 11 is set to the hot water supply pipe 13 side without operating the auxiliary heat source device 4, and the detected temperature of the secondary outlet temperature thermistor 21 is The circulating pump 9 is driven by feedback control so that the TH1 detection temperature becomes −10 ° C. Moreover, the hot water supply mixing valve 12 sets the opening side of the hot water supply pipe 13 to 100% and does not mix the city water with the hot water heated by the hot water supply heat exchanger 3 (hot water supply water).

  Accordingly, as shown in FIG. 5, the heat storage fluid derived from the uppermost portion of the hot water storage tank 2 passes through the secondary side passage 3 b when passing through the primary side passage 3 a of the hot water supply heat exchanger 3. Heat city water. For example, when the detected temperature of TH1 is 40 ° C. and the hot water filling set temperature is 43 ° C., the heat storage fluid is circulated so that the temperature of the hot water flowing out from the secondary passage 3b is 30 ° C. The hot water mixing valve 12 does not mix city water with hot water flowing through the hot water supply pipe 13, and hot water of 30 ° C. is filled to the set amount in the bathtub 90 through the bath hot water supply pipe 13a and the forward pipe 40a. Is called. Here, the hot water filling into the bathtub 90 may be performed not only from the forward pipe 40a but also through the forward pipe 40a and the return pipe 40b.

  Controlling the circulation pump 9 so that the outlet temperature of the secondary passage 3b of the hot water supply heat exchanger 3 becomes the TH1 detected temperature −10 ° C. means that the hot water heat exchanger 3 performs heat exchange with good efficiency. The hot water is heated and the heat storage fluid whose heat quantity is reduced as much as possible by heat exchange is returned to the lower part of the hot water storage tank as much as possible. This is because the temperature of the heat storage fluid (heat medium) flowing out from the primary side passage 3a of the hot water supply heat exchanger 3 is the temperature of the hot water supply and the temperature of the hot water supply flowing into the secondary side passage 3b of the heat exchanger 3 for hot water supply. It can be said that the amount of circulation of the heat storage fluid is adjusted by controlling the operating state of the circulation pump 9 so as to approach a predetermined temperature determined based on the heat exchange performance of the exchanger 3.

  In this way, the heat storage fluid with the heat quantity reduced as much as possible is returned to the lower part of the hot water storage tank as much as possible, and even a medium temperature heat medium having an amount of heat that cannot be directly used for hot water filling at the upper part of the hot water storage tank 2 is used effectively. And the efficiency (COP) of the heat pump unit 1 at the time of re-boiling the heat medium in the hot water storage tank 2 can be improved by not returning the medium temperature heat medium in which a large amount of heat remains in the lower part of the hot water storage tank.

  In step S140, it is determined whether or not the TH1 detection temperature −10 ° C., which is the heating target temperature of hot water after heat exchange, is higher than the water supply temperature. That is, it is determined whether or not heat exchange is possible in the hot water supply heat exchanger 3 by operating the circulation pump 9.

  When the hot water filling into the bathtub 90 is completed in the second hot water filling mode, the circulation pump 9 is stopped, and the bath electromagnetic valve 43 is closed, the reheating operation is performed. In the reheating operation, the bath water circulation pump 42 is driven and the reheating heat source device 41 is combusted.

  Accordingly, as shown in FIG. 6, the bath water is circulated through the bath water circulation circuit 40, and the bath water supplied from the bathtub 90 to the reheating heat source device 41 through the return pipe 40b is reheated and heated. It circulates in the bathtub 90 through the pipe 40a. For example, 30 ° C. bath water is reheated and heated by the reheating heat source 41 to 55 ° C. and returned to the bath 90 and mixed with the bath water remaining in the bath 90, and the bath water temperature in the bath 90 is It gradually rises. Then, when the detected temperature of the bath water temperature thermistor 24 reaches 43 ° C. which is the hot water filling preset temperature, the reheating operation is finished.

  In step S140, when it is determined that the detected temperature of TH1 is lower than the average feed water temperature + 10 ° C., the third hot water filling mode in which the auxiliary heat source device 4 is operated to fill the hot water at the set temperature is executed (step S170). ).

  In the third hot water filling mode, the bath electromagnetic valve 43 is opened, the hot water flow path of the heat source switching valve 11 is set as the auxiliary heat source passage 15 side, the auxiliary heat source unit 4 is combusted, and the circulation pump 9 is not driven. Moreover, the opening area ratio of the hot water supply mixing valve 12 is adjusted so that the detected temperature of the hot water supply temperature thermistor 22 becomes the hot water set temperature, and the city water is mixed with the hot water (hot water supply water) heated by the auxiliary heat source device 4. .

  Accordingly, as shown in FIG. 7, the city water supplied from the water supply pipe 10 passes through the hot water supply heat exchanger 3 without being subjected to heat exchange, and is heated by the combustion operation of the auxiliary heat source device 4. For example, when the detected temperature of TH1 is 15 ° C. and the filling temperature is 43 ° C., the auxiliary heat source 4 is operated so that 9 ° C. city water supplied from the water supply pipe 10 becomes 48 ° C. Is done. In the hot water supply mixing valve 12, for example, 9 ° C. city water is mixed with 48 ° C. hot water flowing into the hot water supply pipe 13 from the auxiliary heat source side passage 15 into 43 ° C. hot water, and the hot water supply pipe 13 a and the outgoing pipe 40 a are connected. The hot water is filled up to a set amount in the bathtub 90. Here, the hot water filling into the bathtub 90 may be performed not only from the forward pipe 40a but also through the forward pipe 40a and the return pipe 40b.

  According to the above-described configuration and operation, the control device 100 determines that the detected temperature of the thermistor TH1 is equal to or higher than the first predetermined temperature (in this example, the hot water set temperature + 10 ° C.) determined based on the hot water set temperature in the bathtub 90. In this case, hot water is heated with the heat medium derived from the uppermost part of the hot water storage tank 2 while prohibiting the operation of the auxiliary heat source device 4 and the reheating heat source device 41, and the hot water is set to the set temperature in the bathtub 90. .

  Further, the detected temperature of the thermistor TH1 is lower than the first predetermined temperature (in this example, the hot water filling set temperature + 10 ° C.) and is determined based on the feed water temperature to the hot water supply heat exchanger 3 (the present temperature In the example, when the temperature is equal to or higher than the average water supply temperature + 10 ° C., the hot water is heated with the heat medium derived from the uppermost portion of the hot water storage tank 2 while prohibiting the operation of the auxiliary heat source device 4 and filled in the bathtub 90. After the hot water filling, the reheating heat source 41 is operated and the hot water in the bathtub 90 is set to the hot water filling set temperature.

  When the temperature detected by the thermistor TH1 is lower than a second predetermined temperature (average water supply temperature + 10 ° C. in this example) determined based on the water supply temperature to the hot water supply heat exchanger 3, the hot water supply heat exchanger 3 The auxiliary heat source device 4 is operated without performing heat exchange in the above to heat the hot water supply water and fill the bath 90 with a set temperature.

  That is, when the heat medium having a temperature higher than the first predetermined temperature that can be filled with the hot water filling temperature into the bathtub 90 only by heat exchange from the detected temperature of the thermistor TH1 is at the uppermost part in the hot water storage tank 2, the combustion is performed. The hot water is heated with the heat medium derived from the hot water storage tank 2 without operating the auxiliary heat source 4 of the type to fill the bathtub 90, and only the medium temperature heat medium lower than the first predetermined temperature is in the hot water storage tank 2. In such a case, the hot water is heated with the heat medium derived from the uppermost part of the hot water storage tank 2 without operating the combustion type auxiliary heat source device 4, and the hot water is filled in the bathtub 90 at a low temperature even when the temperature is lower than the preset temperature. After this low temperature hot water filling, the reheating heat source 41 can be operated to reheat and heat the hot water in the bathtub 90 to the hot water setting temperature.

  If the combustion type auxiliary heat source 4 is operated with the minimum heating capacity and hot water exceeding the hot water set temperature is generated, a large amount of water is used to lower the hot hot water temperature to the hot water set temperature. It is necessary to mix water, and the amount of heat used by the medium temperature heat medium in the hot water storage tank 2 is reduced. In general, the feed water temperature is lower than the temperature of hot water that exceeds the preset hot water temperature when the combustion type auxiliary heat source 4 is operated and heated with the minimum heating capacity.

  However, according to this embodiment, when the hot water filling set temperature is exceeded even if the combustion type auxiliary heat source 4 is operated with the minimum heating capacity, the auxiliary heat source device 4 is not operated and the low temperature hot water filling is not performed. Therefore, high temperature hot water that greatly exceeds the hot water setting temperature is not generated. Therefore, even if there is a medium temperature heat medium in the hot water storage tank 2 that cannot obtain hot water with a hot water filling temperature only by heat exchange, this medium temperature heat medium can be used effectively.

  Moreover, the control apparatus 100 feedback-controls the circulation pump 9 so that the outlet temperature of the secondary side channel | path 3b of the heat exchanger 3 for hot water supply may be set to TH1 detected temperature -10 degreeC. Controlling the circulation pump 9 in this way means that the heat exchanger 3 for hot water supply performs heat exchange with good efficiency to heat the hot water and store as much heat storage fluid as possible by reducing the amount of heat by heat exchange. The temperature of the heat storage fluid (heat medium) flowing out from the primary side passage 3 a of the hot water supply heat exchanger 3 flows into the secondary side passage 3 b of the hot water supply heat exchanger 3. That is, the operating state of the circulation pump 9 is controlled to adjust the circulation amount of the heat storage fluid so as to approach a predetermined temperature determined based on the water supply temperature to be performed and the heat exchange performance of the hot water supply heat exchanger 3.

  Therefore, the temperature of the heat medium that exchanges heat with the hot water supply water in the hot water supply heat exchanger 3 and returns to the lower part of the hot water storage tank 2 can be made as low as possible, and the intermediate temperature heat medium can be used more effectively. In the present embodiment, the heating means for boiling the heat medium in the lower part of the hot water storage tank 2 and storing it in the upper part of the hot water storage tank 2 is the heat pump unit 1, so that the temperature of the heat medium before boiling is lower. The operating efficiency (COP) becomes good. Therefore, the heating operation efficiency of the heat pump unit 1 can be made extremely good by effectively using the medium temperature heat medium and returning the heat medium as low as possible to the lower part of the hot water storage tank 2.

  Moreover, although explanation was abbreviate | omitted when explaining the above-mentioned structure, as shown in FIG. 1, as for the hot water supply apparatus of this embodiment, an upstream end part is connected to the upper part in the hot water storage tank 2, and a downstream end part Is provided with a floor heating circuit 30 connected to the lower part or the central part in the hot water storage tank 2. In the middle of the floor heating circuit 30, a floor heating panel 31 as an example of a heat radiating terminal, a heating circulation pump 32 for circulating hot water in the hot water storage tank 2 in the circuit, and hot water in the circuit are supplemented. And an auxiliary heat source circuit 34 that is connected to the upstream passage and the downstream passage of the heating circulation pump 32 and in which the auxiliary heat source device 33 is arranged.

  Further, the floor heating circuit 30 includes a bypass passage 36 arranged in parallel to the floor heating panel 31 so that the hot water in the floor heating panel 31 does not flow into the hot water storage tank 2 and can circulate in the floor heating panel 31. And a mixing valve 35 provided at the junction of the bypass passage 36 and the floor heating circuit 30.

  The floor heating panel 31 is a heat exchange means that uses the amount of heat in the hot water storage tank 2 in the present embodiment in addition to hot water supply by heat exchange. The floor heating panel 31 that is a heat radiating terminal can be replaced with a hot water hot air heater, a hot water panel convector, a hot water panel radiator, or the like. Moreover, the mixing valve 35 is comprised so that control of the opening degree of two downstream channel | paths is 0 to 100% of range, respectively.

  When performing floor heating in the above configuration, the control device 100 first operates the heating circulation pump 32 and controls the mixing valve 35 so that the opening on the downstream floor heating circuit 30 side becomes 100%. To do. Then, the hot heat storage fluid in the upper part of the hot water storage tank 2 is taken out to the floor heating circuit 30 and passes through the floor heating panel 31 to dissipate heat, thereby heating the floor surface, and the floor heating circuit 30 is further connected to the hot water storage tank 2. And flows into the lower part of the hot water storage tank 2 as a medium temperature fluid.

  When the amount of stored hot water in the hot water storage tank 2 is not sufficient, the control device 100 can operate the auxiliary heat source device 33 to replenish the hot water heating amount. When it is desired to perform floor heating without using the amount of stored hot water in the hot water storage tank 2, the control device 100 operates the auxiliary heat source 33 and opens the mixing valve 35 on the downstream floor heating circuit 30 side. Control is performed so that the degree is 0% and the opening degree on the bypass passage 36 side is 100%.

  When the floor heating operation is performed, an increase in the medium temperature heat medium in the hot water storage tank 2 (a heat medium having a temperature slightly lower than that before heat exchange, for example, about 35 to 50 ° C.) is likely to occur. Therefore, in the hot water supply apparatus having a floor heating function that uses the amount of heat in the hot water storage tank 2 other than the hot water supply by heat exchange, if the above-described hot water filling operation control is performed, the effect of effectively using the medium temperature heat medium is extremely large.

  In addition, according to the configuration of the present embodiment, the floor heating circuit can be configured without providing an expansion tank and a water-water heat exchanger that are normally required for the floor heating circuit. Loss can be reduced.

(Second Embodiment)
Next, a second embodiment will be described based on FIG.

  Compared with the first embodiment described above, the second embodiment determines whether to perform low temperature hot water filling without operating the auxiliary heat source device or whether to operate the auxiliary heat source device to perform hot water filling at the set temperature. The difference is that the second predetermined temperature serving as a reference to be set is set based not on the average water supply temperature but on the hot water set temperature and the minimum heating capacity of the auxiliary heat source. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 8, in this embodiment, when the control device 100 determines in step S120 that the detected temperature of TH1 is less than the hot water set temperature + 10 ° C., the detected temperature of TH1 is the auxiliary heat source device. It is determined whether or not the temperature is a predetermined temperature + 10 ° C. or higher determined from the minimum heating capacity y of 4 (step S240).

  The heating capacity of the auxiliary heat source device 4 (unit: kcal / min, for example) is obtained by multiplying the temperature difference between the hot water set temperature and the target temperature at the outlet of the secondary passage 3b of the hot water supply heat exchanger 3 by the secondary flow rate. It will be a thing. Therefore, if the minimum heating capacity of the combustion type auxiliary heat source 4 is y (unit is, for example, kcal / min), when the heating capacity of the auxiliary heat source 4 is minimum, (hot water set temperature-secondary heat exchanger secondary) Outlet target temperature) × secondary flow rate = y. That is, the heat exchanger secondary outlet target temperature = filled hot water set temperature−y / secondary flow rate.

  In the present embodiment, the heat exchange efficiency of the hot water supply heat exchanger 3 is set to a certain level or more, and the amount of heat taken out from the hot water storage tank 2 is increased as much as possible, so as not to leave the medium temperature heat medium as much as possible. , Heat exchanger secondary outlet target temperature = TH1-10 ° C. Therefore, in step S240, it is determined whether or not TH1-10 ° C. ≧ filling set temperature−y / secondary flow rate (TH1 ≧ filling set temperature−y / secondary flow rate + 10 ° C.). . That is, the temperature (predetermined temperature) determined from y in step S240 is the hot water filling temperature-y / secondary flow rate.

  Here, the predetermined temperature + 10 ° C. determined from the minimum heating capacity y used in step S240 is a second predetermined temperature determined based on the minimum heating capacity and the filling temperature of the auxiliary heat source 4 which is a combustion type heating means. To say.

  In step S240, the heat exchanger secondary outlet target temperature is set so as not to exceed the hot water set temperature even if the auxiliary heat source device 4 is operated with the minimum heating capacity for the purpose of increasing the recovery amount of the medium temperature heat medium as much as possible. Do not lower. Therefore, in order to always set the secondary outlet target temperature to TH1-10 ° C, in step S240, when the hot water of TH1-10 ° C flows into the auxiliary heat source 4 and is heated with the minimum heating capacity, the hot water filling set temperature is set. It is confirmed whether or not it exceeds.

  In step S240, when it is determined that the detected temperature of TH1 is equal to or higher than a predetermined temperature determined from the minimum heating capacity y of the auxiliary heat source device + 10 ° C., step S150 is executed, and then step S160 is executed.

  On the other hand, if it is determined in step S240 that the detected temperature of TH1 is less than the predetermined temperature + 10 ° C. determined from the minimum heating capacity y of the auxiliary heat source device 4, is the detected temperature of TH1 equal to or higher than the average feed water temperature + 10 ° C. It is determined whether or not (step S140). When it is determined that the detected temperature of TH1 is lower than the average feed water temperature + 10 ° C., the third hot water filling mode in which the auxiliary heat source device 4 is operated and the hot water is filled at the set temperature is performed as in the first embodiment. Execute (Step S170).

  When the detected temperature of TH1 is equal to or higher than the average feed water temperature + 10 ° C., first, a fourth hot water filling mode in which the auxiliary heat source device 4 is operated to fill the set temperature while using the amount of hot water stored in the hot water storage tank 2. Is executed (step S280).

  In the fourth hot water filling mode, the bath solenoid valve 43 is opened, the hot water flow path of the heat source switching valve 11 is set as the auxiliary heat source passage 15 side, the auxiliary heat source device 4 is combusted, and the detected temperature of the secondary outlet temperature thermistor 21 Is driven by feedback control of the circulation pump 9 so that the TH1 detection temperature becomes −10 ° C. Moreover, the opening area ratio of the hot water supply mixing valve 12 is adjusted so that the detected temperature of the hot water supply temperature thermistor 22 becomes the hot water set temperature, and the city water is mixed with the hot water (hot water supply water) heated by the auxiliary heat source device 4. .

  Thereby, when the heat storage fluid derived from the uppermost part of the hot water storage tank 2 passes through the primary side passage 3a of the hot water supply heat exchanger 3, the city water passing through the secondary side passage 3b is heated. The city water supplied from the water supply pipe 10 is heat-exchanged by the hot water supply heat exchanger 3 and heated by the combustion operation of the auxiliary heat source device 4. For example, when the detected temperature of TH1 is 25 ° C. and the hot water filling temperature is 43 ° C., the hot water supply heat exchanger 3 is set so that the 9 ° C. city water supplied from the water supply pipe 10 becomes 15 ° C. The auxiliary heat source device 4 is operated so that the hot water becomes 48 ° C. In the hot water supply mixing valve 12, for example, 9 ° C. city water is mixed with 48 ° C. hot water flowing into the hot water supply pipe 13 from the auxiliary heat source side passage 15 into 43 ° C. hot water, and the hot water supply pipe 13 a and the outgoing pipe 40 a are connected. The hot water is filled up to a set amount in the bathtub 90. Here, the hot water filling into the bathtub 90 may be performed not only from the forward pipe 40a but also through the forward pipe 40a and the return pipe 40b.

  According to the above-described configuration and operation, the control device 100 determines that the detected temperature of the thermistor TH1 is equal to or higher than the first predetermined temperature (in this example, the hot water set temperature + 10 ° C.) determined based on the hot water set temperature in the bathtub 90. In this case, hot water is heated with the heat medium derived from the uppermost part of the hot water storage tank 2 while prohibiting the operation of the auxiliary heat source device 4 and the reheating heat source device 41, and the hot water is set to the set temperature in the bathtub 90. .

  In addition, the detected temperature of the thermistor TH1 is lower than a first predetermined temperature (in this example, a hot water filling set temperature + 10 ° C.) and is determined based on the minimum heating capacity y of the auxiliary heat source device 4 and the hot water filling set temperature. When the temperature is equal to or higher than a predetermined temperature (predetermined temperature determined from y described above + 10 ° C.), the hot water is heated with the heat medium derived from the uppermost portion of the hot water storage tank 2 while prohibiting the operation of the auxiliary heat source 4. Hot water is filled in 90, and after the hot water is refilled, the heat source 41 is operated to make the hot water in the bath 90 the hot water set temperature.

  Further, the detected temperature of the thermistor TH1 is less than a second predetermined temperature determined based on the minimum heating capacity y and the hot water filling set temperature of the auxiliary heat source device 4, and based on the feed water temperature to the hot water supply heat exchanger 3 When the temperature is equal to or higher than a predetermined temperature (average water supply temperature + 10 ° C. in this example), the hot water is heated with the heat medium derived from the uppermost part of the hot water storage tank 2 while the auxiliary heat source 4 is operated, and the set temperature is set in the bathtub 90. Do the hot water filling.

  Further, when the temperature detected by the thermistor TH1 is lower than a predetermined temperature (average water supply temperature + 10 ° C. in this example) determined based on the water supply temperature to the hot water supply heat exchanger 3, The auxiliary heat source device 4 is operated without heat exchange to heat the hot water supply water, and the bathtub 90 is filled with a set temperature.

  That is, when the heat medium having a temperature higher than the first predetermined temperature that can be filled with the hot water filling temperature into the bathtub 90 only by heat exchange from the detected temperature of the thermistor TH1 is at the uppermost part in the hot water storage tank 2, the combustion is performed. The hot water is heated with the heat medium derived from the hot water storage tank 2 without operating the auxiliary heat source 4 of the type to fill the bathtub 90, and only the medium temperature heat medium lower than the first predetermined temperature is in the hot water storage tank 2. In such a case, the hot water is heated with the heat medium derived from the uppermost part of the hot water storage tank 2 without operating the combustion type auxiliary heat source device 4, and the hot water is filled in the bathtub 90 at a low temperature even when the temperature is lower than the preset temperature. After this low temperature hot water filling, the reheating heat source 41 can be operated to reheat and heat the hot water in the bathtub 90 to the hot water setting temperature.

  If the combustion type auxiliary heat source 4 is operated with the minimum heating capacity and hot water exceeding the hot water set temperature is generated, a large amount of water is used to lower the hot hot water temperature to the hot water set temperature. It is necessary to mix water, and the amount of heat used by the medium temperature heat medium in the hot water storage tank 2 is reduced.

  However, according to the present embodiment, the detected temperature of TH1 is lower than the first predetermined temperature, and the second predetermined temperature determined based on the minimum heating capacity of the combustion type auxiliary heat source device 4 and the hot water set temperature. In the case of the above, that is, when the hot water filling set temperature is exceeded even if the combustion type auxiliary heat source 4 is operated with the minimum heating capacity, the low temperature hot water filling is not performed without operating the auxiliary heat source 4. As a result, hot water that greatly exceeds the hot water setting temperature is not generated. Therefore, even if there is a medium temperature heat medium in the hot water storage tank 2 that cannot obtain hot water with a hot water filling temperature only by heat exchange, this medium temperature heat medium can be used effectively.

  Even if the detected temperature of TH1 is lower than the second predetermined temperature, the fourth hot water filling mode is executed when there is a medium temperature heat medium that can use the amount of heat in the hot water storage tank 2, and the hot water supply heat exchanger 3 Thus, the auxiliary heat source device 4 can be operated while effectively using the amount of heat of the medium temperature heat medium, and the hot water filling at the hot water filling set temperature can be performed in the bathtub 90.

  In the present embodiment, the heating means for boiling the heat medium in the lower part of the hot water storage tank 2 and storing it in the upper part of the hot water storage tank 2 is the heat pump unit 1, so that the temperature of the heat medium before boiling is lower. The operating efficiency (COP) becomes good. Therefore, the heating operation efficiency of the heat pump unit 1 can be made extremely good by effectively using the medium temperature heat medium and returning the heat medium as low as possible to the lower part of the hot water storage tank 2.

(Third embodiment)
Next, a third embodiment will be described based on FIG.

  Compared with the second embodiment described above, the third embodiment adds switching between the preset temperature hot water filling mode and the low temperature hot water filling mode to the temperature of the uppermost heat medium in the hot water storage tank. The difference is that it also takes into account the amount of heat in the hot water tank. In addition, about the part similar to 1st and 2nd embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 8, in the present embodiment, when performing the hot water filling operation control, the control device 100 first sets the temperature detected by the uppermost thermistor TH1 of the hot water storage thermistor 17 to the hot water filling set temperature + 10 ° C. It is described above, and it is determined whether or not the amount of heat of the heat medium in the hot water storage tank 2 calculated from the detected value of the hot water storage thermistor 17 (TH1 to TH5) is equal to or greater than the amount of heat necessary for filling the hot water in the bathtub 90 ( Step S320).

  The temperature detected by the thermistor TH1 is equal to or higher than the hot water set temperature + 10 ° C., and the amount of heat of the heat medium in the hot water storage tank 2 calculated from the detected value of the hot water storage thermistor 17 (TH1 to TH5) is necessary for hot water filling. If it is determined that the amount of heat is greater than or equal to (YES in step S320), step S130 is executed, and the temperature detected by the thermistor TH1 is less than the hot water set temperature + 10 ° C. or the hot water storage thermistor 17 (TH1 to TH5) is detected. When it is determined that the amount of heat of the heat medium in the hot water storage tank 2 calculated from the value is less than the amount of heat necessary for filling (NO in step S320), the process proceeds to step S240.

  Here, TH1 provided at the uppermost portion of the hot water storage thermistor 17 corresponds to temperature detecting means for detecting the temperature of the uppermost heat medium in the tank, and the plural hot water storage thermistors 17 comprising TH1 to TH5 It can be said that it is a calorific value detecting means for detecting the calorific value of the heat medium stored in the tank 2.

  In the present embodiment, when the circulating pump 9 is feedback-controlled and driven so that the detected temperature of the secondary outlet temperature thermistor 21 becomes TH1 detected temperature −10 ° C. in step S150, the secondary outlet temperature Control is performed so that the temperature detected by the thermistor 21 does not exceed the hot water filling temperature + 5 ° C. That is, the maximum value of the control target temperature is set to the hot water filling set temperature + 5 ° C. This is to prevent the target temperature from becoming too high when the amount of hot water is insufficient even if the detected temperature of TH1 is high.

  According to the control described above, the control device 100 allows the amount of heat of the heat medium stored in the hot water storage tank 2 to flow into the bathtub 90 without operating the combustion type auxiliary heat source 4 and the reheating heat source 41. It is determined whether or not the hot water at the set temperature is equal to or higher than the heat amount that can be set to the set hot water amount, the detected temperature of TH1 is equal to or higher than the first predetermined temperature, and the heat amount of the heat medium in the hot water storage tank 2 is hot water filled. When the amount of heat is more than possible, the hot water is heated with the heat medium derived from the hot water storage tank 2 while prohibiting the operation of the auxiliary heat source device 4 and the reheating heat source device 41, and the hot water of the set temperature is filled in the bathtub 90. To do.

  If the detected temperature of TH1 is less than the first predetermined temperature or the amount of heat of the heat medium in the hot water storage tank 2 is less than the amount of heat that can be filled, the operation of the auxiliary heat source device 4 is prohibited and the hot water storage tank 2 is prohibited. The hot water is heated with the heat medium derived from the top of the water to fill the bathtub 90 at a low temperature, and after the hot water is filled, the reheating heat source 41 is operated to raise the temperature of the hot water in the bathtub 90 to the preset temperature. can do.

  According to this, even when the temperature of the uppermost heat medium in the hot water storage tank 2 is not required to operate the combustion type auxiliary heat source 4, hot water having a hot water filling set temperature can be obtained. When the amount of heat of the heat medium is insufficient for the amount of heat necessary for completing the filling of the set temperature (when the setting temperature cannot fill the set amount of hot water), the hot water supply heat is not operated without operating the auxiliary heat source device 4. In the exchanger 3, hot water is heated with a heat medium derived from the uppermost part of the hot water storage tank 2 and filled in the bathtub 90, and after the hot water is filled, the hot water in the bathtub 90 is chased to the set temperature by using the reheating heat source 41. Can be fired. Therefore, the medium temperature heat medium in the hot water storage tank 2 can be used effectively.

  In the present embodiment, the heating means for boiling the heat medium in the lower part of the hot water storage tank 2 and storing it in the upper part of the hot water storage tank 2 is the heat pump unit 1, so that the temperature of the heat medium before boiling is lower. The operating efficiency (COP) becomes good. Therefore, the heating operation efficiency of the heat pump unit 1 can be made extremely good by effectively using the medium temperature heat medium and returning the heat medium as low as possible to the lower part of the hot water storage tank 2.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS.

  The fourth embodiment is an example in which the present invention is applied to a hot water supply device that stores hot water for hot water supply in a hot water storage tank, that is, a direct hot water supply type hot water supply device. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 10, in the present embodiment, the hot water supply apparatus is heated by a heat pump unit 1 (heat pump apparatus) that is a heating unit that heat-exchanges high-temperature and high-pressure refrigerant to boil hot water, and the heat pump unit 1. Hot water storage tank 2 (corresponding to a tank) that stores hot water as hot water supply water, and low-temperature water in the lower part of the hot water storage tank 2 flows out and is heated by the heat pump unit 1 so as to return to the upper part of the hot water storage tank 2 A circulation circuit 6, an auxiliary heat source device 4 (corresponding to a heating means) that can further heat the hot water supplied from the hot water storage tank 2, and a control device 100 that controls the operation of the hot water supply device. Yes.

  The water supply pipe 10 is connected to an introduction port provided at the lowermost part of the hot water storage tank 2 so that city water (tap water) can be supplied to the lower part of the hot water storage tank 2.

  In addition, the hot water supply pipe 13 is configured by two paths of an upper part outlet pipe 51 and an intermediate part outlet pipe 52, and joins on the upstream side of the hot water supply mixing valve 12. The upper outlet pipe 51 has an upstream end connected to the uppermost part (upper part) of the hot water storage tank 2, and can discharge hot hot water stored in the upper part of the hot water storage tank 2. On the other hand, the intermediate part outlet pipe 52 is connected to the intermediate part of the hot water storage tank 2 at the upstream end so that the intermediate temperature hot water stored in the intermediate part of the hot water storage tank 2 can be discharged. In addition, the intermediate | middle part derivation | leading-out pipe | tube 52 is connected to the same height as the thermistor TH3 arrangement position of the hot water storage tank 2.

  At the junction of the upper outlet pipe 51 and the intermediate outlet pipe 52, hot hot water discharged through the upper outlet pipe 51 is mixed with hot hot water discharged through the intermediate outlet pipe 52. An intermediate temperature water mixing valve 53 is provided, and the temperature of hot water flowing into the hot water supply mixing valve 12 is adjusted by adjusting the ratio of the opening area between the upper outlet pipe 51 side and the intermediate outlet pipe 52 side. . An intermediate temperature water mixing temperature thermistor 54 that detects the temperature of hot water flowing into the hot water supply mixing valve 12 is disposed downstream of the intermediate temperature water mixing valve 53 of the hot water supply pipe 13.

  In the present embodiment, an auxiliary heat source device 4 that is a combustion type heating means is provided in the intermediate portion outlet pipe 52.

  The control device 100 which is a control means is based on input information from a remote controller (not shown) or each thermistor 17, 20, 22, 24, 25, 54, etc., the heat pump unit 1, the auxiliary heat source device 4, the hot water mixing valve 12 and so on. A signal for controlling the regenerative heat source 41, the bath water circulation pump 42, the bath electromagnetic valve 43, the intermediate hot water mixing valve 53, and the like is output.

  Next, the operation of the hot water supply apparatus having the above configuration will be described. First, boiling control of the hot water supply device will be described. When the hot water supply switch of the remote controller is turned on by the user, the control device 100 mainly uses the heat pump unit in the late-night time zone (for example, the time zone from 23:00 on the current day to 7 o'clock on the next day) when the power rate is inexpensive. 1 is operated, the hot water supply water in the hot water storage tank 2 is heated, and a necessary amount of heat (hot water supply water) is stored.

  Next, control when hot water is filled in the bathtub 90 will be described with reference to FIG. FIG. 11 is a flowchart showing a schematic control operation of the filling operation control performed by the control device 100.

  As shown in FIG. 11, first, the control device 100 determines whether or not the temperature detected by the uppermost (upper) thermistor TH1 of the hot water storage thermistor 17 is equal to or higher than the hot water filling temperature + 5 ° C. (step S420). . Here, the hot water filling set temperature + 5 ° C. corresponds to a first predetermined temperature determined based on the hot water filling set temperature. When the detected temperature of TH1 is equal to or higher than the hot water filling set temperature + 5 ° C., the first hot water filling mode is executed in which hot water filling at the set temperature is performed only by the amount of stored hot water in the hot water storage tank 2 (step S430).

  In the first hot water filling mode, the hot water mixing valve 53 is fed back so that the detected temperature of the hot water mixing thermistor 54 becomes the hot water filling temperature + 5 ° C. without opening the bath solenoid valve 43 and operating the auxiliary heat source 4. Control and adjust the aperture area ratio. Further, the opening area ratio of the hot water supply mixing valve 12 is adjusted so that the detected temperature of the hot water supply temperature thermistor 22 becomes the hot water set temperature, and hot water discharged from the hot water storage tank 2 (hot water supply water) and city water are mixed. .

  Thereby, as shown in FIG. 12, the hot water discharged from the uppermost part of the hot water storage tank 2 and the hot water discharged from the intermediate part are mixed by the intermediate temperature water mixing valve 53. For example, when the detected temperature of TH1 is 80 ° C., the detected temperature of TH3 is 35 ° C., and the hot water filling set temperature is 43 ° C., the medium hot water mixing valve is set so that the temperature of hot water after mixing is 48 ° C. 53 is adjusted.

  In the hot water supply mixing valve 12, for example, 9 ° C. city water is mixed with 48 ° C. hot water flowing through the hot water supply pipe 13 to form 43 ° C. hot water and set in the bathtub 90 through the bath hot water supply pipe 13 a and the forward pipe 40 a. Hot water filling is performed to the amount. The hot water filling into the bathtub 90 may be performed not only from the forward pipe 40a but also from the return pipe 40b via the stopped bath water circulation pump 42 in addition to the forward pipe 40a.

  In FIG. 12, the path through which the fluid flows is indicated by a solid line, and the path that does not flow is indicated by a broken line. The same applies to FIGS. 13 to 16 below.

  In the first hot water filling mode, hot water filling at a set temperature is performed without heating the hot water stored in the hot water storage tank 2, but when there is hot water that can be discharged in the intermediate portion in the hot water storage tank 2, the intermediate portion Priority is given to hot springs from This is realized by feedback control of the intermediate temperature water mixing valve 53 with the temperature detected by the intermediate temperature water thermistor 54. For example, when the detected temperature of TH1 is 80 ° C., the detected temperature of TH3 is 50 ° C., and the hot water filling temperature is 43 ° C., the hot water mixing valve so that the temperature of hot water after mixing is 48 ° C. When 53 is adjusted, as shown in FIG. 13, the intermediate-temperature water mixing valve 53 has an opening on the intermediate part outlet pipe 52 side of 100%, and hot water is discharged only from the intermediate part in the hot water storage tank 2.

  If it is determined in step S420 that the detected temperature of TH1 is lower than the hot water set temperature + 5 ° C., it is determined whether the detected temperature of TH1 is equal to or higher than the average water supply temperature + 5 ° C. (step S440). Here, the average water supply temperature + 5 ° C. corresponds to a second predetermined temperature determined based on the water supply temperature to the hot water supply heat exchanger. The average water supply temperature is an average value of temperatures detected by the water supply temperature thermistor 20 during a predetermined period in the past.

  When the detected temperature of TH1 is equal to or higher than the average water supply temperature + 5 ° C., first, a second hot water filling mode is executed in which hot water filling at a low temperature lower than the set temperature is performed only with hot water in the hot water storage tank 2 (step S450). Next, the reheating operation by the reheating heat source device 41 is performed (step S160).

  In the second hot water filling mode, the hot water mixing valve 53 is fed back so that the detected temperature of the hot water mixing thermistor 54 becomes the hot water filling temperature + 5 ° C. without opening the bath solenoid valve 43 and operating the auxiliary heat source 4. Control and adjust the aperture area ratio. At this time, since the detected temperature of TH1 is less than the hot water set temperature + 5 ° C., the middle temperature water mixing valve 53 sets the upper outlet pipe 51 side to 100% opening by feedback control.

  Moreover, the opening area ratio of the hot water supply mixing valve 12 is adjusted so that the detected temperature of the hot water supply temperature thermistor 22 becomes the hot water filling set temperature. When the hot water temperature discharged from the hot water storage tank 2 is equal to or lower than the hot water set temperature, the hot water mixing valve 12 makes the hot water supply pipe 13 side 100% open by this feedback control. Do not mix city water with water.

  Accordingly, as shown in FIG. 14, hot water discharged from the uppermost portion of the hot water storage tank 2 is filled in the bathtub 90. For example, when the detected temperature of TH1 is 35 ° C., the detected temperature of TH3 is 9 ° C., and the hot water setting temperature is 43 ° C., the hot water mixing valve is adjusted so that the temperature of hot water after mixing is 48 ° C. 53 is adjusted so that the upper outlet pipe 51 side is 100% open, and hot water of 35 ° C. is discharged.

  The hot water mixing valve 12 does not mix the city water with the hot water flowing through the hot water supply pipe 13, and hot water of 35 ° C. is filled to the set amount in the bathtub 90 through the bath hot water supply pipe 13a and the forward pipe 40a. Is called. Here, the hot water filling into the bathtub 90 may be performed not only from the forward pipe 40a but also through the forward pipe 40a and the return pipe 40b.

  When the low temperature hot water filling into the bathtub 90 is completed in the second hot water filling mode and the bath electromagnetic valve 43 is closed, the reheating operation is performed. In the reheating operation, the bath water circulation pump 42 is driven and the reheating heat source device 41 is combusted.

  Accordingly, as shown in FIG. 15, the bath water is circulated in the bath water circulation circuit 40, and the bath water supplied from the bathtub 90 to the reheating heat source device 41 through the return pipe 40b is reheated and heated. It circulates in the bathtub 90 through the pipe 40a. For example, 35 ° C. bath water is reheated and heated by the reheating heat source 41 to 60 ° C. and returned to the bath 90 and mixed with the bath water remaining in the bath 90, and the bath water temperature in the bath 90 is It gradually rises. Then, when the detected temperature of the bath water temperature thermistor 24 reaches 43 ° C. which is the hot water filling preset temperature, the reheating operation is finished.

  In step S440, when it is determined that the detected temperature of TH1 is lower than the average feed water temperature + 5 ° C., the third hot water filling mode in which the auxiliary heat source device 4 is operated to fill the hot water at the set temperature is executed (step S470). ).

  In the third hot water filling mode, the bath electromagnetic valve 43 is opened, and the intermediate heat water mixing valve 53 is set to the intermediate part outlet pipe 52 side 100% opening degree to perform the combustion operation of the auxiliary heat source unit 4. Moreover, the opening area ratio of the hot water supply mixing valve 12 is adjusted so that the detected temperature of the hot water supply temperature thermistor 22 becomes the hot water set temperature, and the city water is mixed with the hot water (hot water supply water) heated by the auxiliary heat source device 4. .

  Thereby, as shown in FIG. 16, the hot water discharged from the intermediate part outlet pipe 52 is heated by the combustion operation of the auxiliary heat source device 4. For example, when the detected temperature of TH1 and the detected temperature of TH3 are both 9 ° C. (all the water in the hot water storage tank 2 is 9 ° C.) and the hot water filling set temperature is 43 ° C., the intermediate portion in the hot water storage tank 2 The auxiliary heat source unit 4 is operated so that the 9 ° C. water supplied from the water reaches 48 ° C. In the hot water supply mixing valve 12, for example, 9 ° C. city water is mixed with 48 ° C. hot water heated by the auxiliary heat source device 4 to form 43 ° C. hot water, and the bath 90 hot water supply pipe 13 a and the forward pipe 40 a are used in the bathtub 90. The hot water is filled up to the set amount. Here, the hot water filling into the bathtub 90 may be performed not only from the forward pipe 40a but also through the forward pipe 40a and the return pipe 40b.

  According to the above-described configuration and operation, the control device 100 determines that the temperature detected by the thermistor TH1 is equal to or higher than the first predetermined temperature (in this example, the hot water set temperature + 5 ° C.) determined based on the hot water set temperature in the bathtub 90. In such a case, the bath 90 is filled with hot water discharged from the hot water storage tank 2 while the operation of the auxiliary heat source device 4 and the reheating heat source device 41 is prohibited.

  Further, the detected temperature of the thermistor TH1 is lower than the first predetermined temperature (in this example, the hot water filling set temperature + 5 ° C.) and is determined based on the water supply temperature to the hot water storage tank 2 (in this example, the average temperature) If the temperature is higher than the water supply temperature + 5 ° C.), the hot water discharged from the uppermost part of the hot water storage tank 2 is filled in the bathtub 90 while prohibiting the operation of the auxiliary heat source device 4 and the reheating heat source 41 is turned on after the water is filled. The hot water in the bathtub 90 is set to a hot water filling set temperature.

  When the temperature detected by the thermistor TH1 is lower than a second predetermined temperature (in this example, average water supply temperature + 5 ° C.) determined based on the water supply temperature to the hot water storage tank 2, the auxiliary heat source 4 is operated to store hot water. Hot water discharged from the middle part of the tank 2 is heated to fill the bathtub 90 with a set temperature.

  That is, hot water having a temperature higher than the first predetermined temperature that can be filled in the bathtub 90 at the set temperature without being heated by the auxiliary heat source 4 from the temperature detected by the thermistor TH1 is at the top of the hot water storage tank 2. In such a case, hot water discharged from the hot water storage tank 2 is filled in the bathtub 90 without operating the auxiliary heat source 4, and if only hot water having a temperature lower than the first predetermined temperature is present in the hot water storage tank 2, combustion is performed. The hot water led out from the uppermost part of the hot water storage tank 2 without operating the auxiliary heat source 4 of the hot water type is poured into the bathtub 90 at a low temperature even when the temperature is lower than the preset temperature, and after the low temperature, the reheating heat source 41 The hot water in the bathtub 90 can be reheated to a preset temperature and heated up.

  If the combustion type auxiliary heat source 4 is operated with the minimum heating capacity and hot water exceeding the hot water set temperature is generated, a large amount of water is used to lower the hot hot water temperature to the hot water set temperature. It is necessary to mix water, and the amount of medium-temperature hot water in the hot water storage tank 2 is reduced. In general, the feed water temperature is lower than the temperature of hot water that exceeds the preset hot water temperature when the combustion type auxiliary heat source 4 is operated and heated with the minimum heating capacity.

  However, according to this embodiment, when the hot water filling set temperature is exceeded even if the combustion type auxiliary heat source 4 is operated with the minimum heating capacity, the auxiliary heat source device 4 is not operated and the low temperature hot water filling is not performed. Therefore, high temperature hot water that greatly exceeds the hot water setting temperature is not generated. Therefore, even if there is hot water in the hot water storage tank 2 that cannot obtain hot water filling temperature without auxiliary heating, this hot water can be used effectively.

  In the present embodiment, since the boiling means for boiling the hot water in the lower part of the hot water storage tank 2 and storing it in the upper part of the hot water storage tank 2 is the heat pump unit 1, the lower the temperature of the hot water before boiling, the more Efficiency (COP) is improved. Therefore, the boiling operation efficiency of the heat pump unit 1 can be made extremely good by effectively using the medium temperature hot water in the hot water storage tank 2.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIG.

  Compared with the above-described fourth embodiment, the fifth embodiment determines whether to perform low temperature hot water filling without operating the auxiliary heat source device or whether to operate the auxiliary heat source device to perform hot water filling at the set temperature. The difference is that the second predetermined temperature serving as a reference to be set is set based not on the average water supply temperature but on the hot water set temperature and the minimum heating capacity of the auxiliary heat source. In addition, about the part similar to 1st and 4th embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 17, in this embodiment, when the control device 100 determines in step S420 that the detected temperature of TH1 is less than the hot water set temperature + 5 ° C., the detected temperature of TH3 is the auxiliary heat source device. It is determined whether the temperature is equal to or higher than a predetermined temperature determined from the minimum heating capacity y of 4 (step S540).

  The heating capacity (unit: for example, kcal / min) of the auxiliary heat source unit 4 is obtained by multiplying the temperature difference between the hot water set temperature and the auxiliary heat source unit 4 inlet temperature by the flow rate of the auxiliary heat source unit 4. Therefore, if the minimum heating capacity of the combustion type auxiliary heat source 4 is y (unit is, for example, kcal / min), when the heating capacity of the auxiliary heat source 4 is minimum, (hot water set temperature−auxiliary heat source inlet temperature) X Auxiliary heat source flow rate = y. That is, auxiliary heat source inlet temperature = hot water filling set temperature−y / auxiliary heat source flow rate.

  Here, a constant value can be set as the value of the auxiliary heat source flow rate. This is because the flow rate at the time of hot water supply to the bathtub differs from the hot water from other terminals such as other currants, and the flow rate usually hardly fluctuates. Therefore, it can be set as a constant value from the maximum flow rate immediately after the start of hot water supply to the bathtub. The auxiliary heat source flow rate is a flow rate for detecting a flow rate by providing a dedicated flow meter for detecting the flow rate passing through the auxiliary heat source device, or for detecting a hot water supply flow rate (not shown) provided downstream of the hot water mixing valve 12. You may obtain | require from the detection value of a meter.

  Since the auxiliary heat source inlet temperature can be substituted by the TH3 detection temperature of the hot water storage tank 2, in this embodiment, it is determined whether or not TH3 ≧ hot water filling set temperature−y / auxiliary heat source flow rate in step S540. That is, the temperature (predetermined temperature) determined from y in step S540 is the hot water filling temperature -y / auxiliary heat source flow rate.

  Here, the predetermined temperature determined from the minimum heating capacity y used in step S540 is the second predetermined temperature determined based on the minimum heating capacity of the auxiliary heat source device 4 which is a combustion type heating means and the filling temperature. become.

  In step S540, it is confirmed whether or not the hot water filling temperature is exceeded when the hot water at the TH3 detection temperature flows into the auxiliary heat source 4 and is heated with the minimum heating capacity.

  If it is determined in step S540 that the detected temperature of TH3 is equal to or higher than a predetermined temperature determined from the minimum heating capacity y of the auxiliary heat source unit 4, step S450 is executed, and then step S160 is executed.

  On the other hand, when it is determined in step S540 that the detected temperature of TH3 is lower than a predetermined temperature determined from the minimum heating capacity y of the auxiliary heat source unit 4, the auxiliary heat source unit 4 is operated as in the fourth embodiment. The third hot water filling mode for hot water filling at the set temperature is executed (step S470).

  According to the above-described configuration and operation, the control device 100 determines that the temperature detected by the thermistor TH1 is equal to or higher than the first predetermined temperature (in this example, the hot water set temperature + 5 ° C.) determined based on the hot water set temperature in the bathtub 90. In such a case, the bath 90 is filled with hot water discharged from the hot water storage tank 2 while the operation of the auxiliary heat source device 4 and the reheating heat source device 41 is prohibited.

  Further, the detected temperature of the thermistor TH1 is lower than the first predetermined temperature (in this example, the filling temperature + 5 ° C.), and the detection temperature of the thermistor TH3 is set to the minimum heating capacity y and the filling temperature of the auxiliary heat source device 4. When the temperature is equal to or higher than a second predetermined temperature determined based on the above (predetermined temperature determined from y in the present example), the hot water discharged from the uppermost portion of the hot water storage tank 2 is kept in the bathtub 90 while the operation of the auxiliary heat source 4 is prohibited. The hot water source 41 is operated after the hot water filling, and the hot water in the bathtub 90 is set to the hot water setting temperature.

  Further, when the detected temperature of the thermistor TH3 is lower than a second predetermined temperature (predetermined temperature determined from y in the present example) determined based on the minimum heating capacity y and the hot water set temperature of the auxiliary heat source device 4, The auxiliary heat source 4 is operated to heat the hot water discharged from the intermediate portion of the hot water storage tank 2 and fill the bathtub 90 with a set temperature.

  That is, hot water having a temperature higher than the first predetermined temperature that can be filled in the bathtub 90 at the set temperature without being heated by the auxiliary heat source 4 from the temperature detected by the thermistor TH1 is at the top of the hot water storage tank 2. In such a case, hot water discharged from the hot water storage tank 2 is filled in the bathtub 90 without operating the auxiliary heat source 4, and if only hot water having a temperature lower than the first predetermined temperature is present in the hot water storage tank 2, combustion is performed. The hot water led out from the uppermost part of the hot water storage tank 2 without operating the auxiliary heat source 4 of the hot water type is poured into the bathtub 90 at a low temperature even when the temperature is lower than the preset temperature, and after the low temperature, the reheating heat source 41 The hot water in the bathtub 90 can be reheated to a preset temperature and heated up.

  If the combustion type auxiliary heat source 4 is operated with the minimum heating capacity and hot water exceeding the hot water set temperature is generated, a large amount of water is used to lower the hot hot water temperature to the hot water set temperature. It is necessary to mix water, and the amount of medium-temperature hot water in the hot water storage tank 2 is reduced.

  However, according to this embodiment, when the hot water filling set temperature is exceeded even if the combustion type auxiliary heat source 4 is operated with the minimum heating capacity, the auxiliary heat source device 4 is not operated and the low temperature hot water filling is not performed. Therefore, high temperature hot water that greatly exceeds the hot water setting temperature is not generated. Therefore, even if there is hot water in the hot water storage tank 2 that cannot obtain hot water filling temperature without auxiliary heating, this hot water can be used effectively.

  In the present embodiment, since the boiling means for boiling the hot water in the lower part of the hot water storage tank 2 and storing it in the upper part of the hot water storage tank 2 is the heat pump unit 1, the lower the temperature of the hot water before boiling, the more Efficiency (COP) is improved. Therefore, the boiling operation efficiency of the heat pump unit 1 can be made extremely good by effectively using the medium temperature hot water in the hot water storage tank 2.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIG.

  Compared to the fifth embodiment described above, the sixth embodiment adds the temperature switching mode between the preset temperature hot water filling mode and the low temperature hot water filling mode to the temperature of the hot water in the uppermost part of the hot water storage tank. The difference is that the determination is made in consideration of the amount of heat in the hot water storage tank. In addition, about the part similar to 1st, 4th and 5th embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 18, in the present embodiment, the control device 100 determines in step S420 that the temperature detected by the uppermost thermistor TH1 of the hot water storage thermistor 17 is equal to or higher than the hot water filling set temperature + 5 ° C. Determines whether the amount of hot water in the hot water storage tank 2 calculated from the detected value of the hot water storage thermistor 17 (TH1 to TH5) is equal to or greater than the amount of heat necessary for filling the hot water in the bathtub 90 (step S425).

  If it is determined that the amount of hot water in the hot water storage tank 2 calculated from the detection value of the hot water storage thermistor 17 (TH1 to TH5) is equal to or greater than the amount of heat necessary for filling, the hot water storage thermistor 17 is executed. When it is determined that the amount of hot water in the hot water storage tank 2 calculated from the detected values of (TH1 to TH5) is less than the amount of heat necessary for filling, the process proceeds to step S450.

  Here, TH1 provided at the uppermost portion of the hot water storage thermistor 17 corresponds to a temperature detecting means for detecting the temperature of the uppermost hot water in the tank, and the plurality of hot water storage thermistors 17 comprising TH1 to TH5 are hot water storage tanks. It can be said that it is a calorific value detection means for detecting the calorific value of hot water stored in 2.

  According to the control described above, the control device 100 allows the hot water in the hot water storage tank 2 to store hot water in the bathtub 90 without operating the combustion-type auxiliary heat source 4 and the reheating heat source 41. It is determined whether or not the hot water at the set temperature is equal to or higher than a heat amount that allows the hot water to be set, and the detected temperature of TH1 is equal to or higher than the first predetermined temperature, and the amount of hot water in the hot water storage tank 2 is hot. When the amount of heat is more than the possible amount, the hot water discharged from the hot water storage tank 2 is set in the bathtub 90 as a set temperature while prohibiting the operation of the auxiliary heat source device 4 and the reheating heat source device 41.

  When the detected temperature of TH1 is lower than the first predetermined temperature or the amount of hot water in the hot water storage tank 2 is less than the amount of heat that can be filled, the operation of the auxiliary heat source device 4 is prohibited and the hot water storage tank 2 is prohibited. The hot water supplied from the top of the hot water is heated to fill the bathtub 90 at a low temperature, and after the hot water is filled, the reheating heat source 41 is operated to raise the temperature of the hot water in the bathtub 90 to the preset temperature. Can do.

  According to this, even if the temperature of the uppermost hot water in the hot water storage tank 2 can be filled with the hot water filling temperature without operating the combustion type auxiliary heat source 4, the hot water in the hot water storage tank 2 is maintained. When the amount of heat is insufficient to the amount of heat required to complete the filling of the set temperature (when the set temperature cannot be filled at the set temperature), the heat exchanger for hot water supply is operated without operating the auxiliary heat source device 4. 3, the hot water discharged from the uppermost part of the hot water storage tank 2 is filled in the bathtub 90, and after the hot water is filled, the hot water in the bathtub 90 can be reheated to the hot water set temperature by the reheating heat source 41. Therefore, the hot water in the hot water storage tank 2 can be used effectively.

  In the present embodiment, since the boiling means for boiling the hot water in the lower part of the hot water storage tank 2 and storing it in the upper part of the hot water storage tank 2 is the heat pump unit 1, the lower the temperature of the hot water before boiling, the more Efficiency (COP) is improved. Therefore, the boiling operation efficiency of the heat pump unit 1 can be made extremely good by effectively using the medium temperature hot water in the hot water storage tank 2.

(Other embodiments)
In the sixth embodiment, in step S540, it is determined whether or not the detected temperature of TH3 is equal to or higher than a second predetermined temperature determined based on the minimum heating capacity y of the auxiliary heat source device 4 and the hot water set temperature. However, the determination condition used here is equal to or higher than the second predetermined temperature at which the detected temperature of TH1 is determined based on the feed water temperature (for example, the detected temperature of TH1 is the average feed water temperature +5), as in step S440 of the fourth embodiment. It may be determined whether the temperature is equal to or higher than ° C.

  Further, in step S540 of the fifth and sixth embodiments, whether or not one of the two conditions is satisfied, that is, whether the detected temperature of TH1 is equal to or higher than a predetermined temperature determined based on the water supply temperature, or It may be determined whether the detected temperature of TH3 is equal to or higher than a second predetermined temperature determined based on the minimum heating capacity y of the auxiliary heat source device 4 and the hot water set temperature.

  Moreover, in each said embodiment, although the auxiliary heat source device 4 was provided in the hot water supply path, the arrangement position of a combustion type heating means is not limited to this. For example, as shown in FIGS. 19 to 22, the auxiliary heat source device 4 </ b> A as a heating means may be provided in the heat storage circulation circuit 6 that circulates when boiling the heat medium or hot water in the hot water storage tank 2. Good. Further, as is apparent from the drawing, the auxiliary heat source device 4 may be arranged in series with the heat pump unit 1 or may be arranged in parallel.

  Moreover, in the said 4th-6th embodiment, in the hot water supply apparatus of the direct hot water type which can discharge hot water from the upper part and intermediate part of the hot water storage tank 2, the auxiliary heat source device 4 was provided in the hot water discharge path from the intermediate part. You may provide in the downstream from the confluence | merging point of the hot water path from an upper part, and the hot water path from an intermediate part. Further, it may be a direct hot water supply type hot water supply device that can discharge hot water only from the upper part of the hot water storage tank.

  In each of the above embodiments, margins such as + 10 ° C. and + 5 ° C. are set for the temperature used for determination and the control target temperature. However, the margin is not limited to this value, and depends on various characteristics of the hot water supply device. Other values may be set.

  Further, in each of the above embodiments, after the low temperature filling is performed in step S150 or S450, the reheating operation is performed in step S160, and the renewal operation is not performed after executing steps S130, S170, S280, S430, and S470. However, after performing steps S130, S170, S280, S430, and S470 to perform a predetermined amount of hot water filling, the bath water temperature is slightly lower than the set temperature due to heat dissipation from the bathtub 90, etc. May perform a chasing operation for fine adjustment of the bath water temperature.

  Further, in each of the above embodiments, the means for boiling and heating the heat medium or hot water supply water in the hot water storage tank 2 is a heat pump unit, but the boiling means is not limited to this. Further, the number of hot water storage thermistors 17 provided in the hot water storage tank 2 is not limited to five.

It is the schematic diagram which showed schematic structure of the hot water supply apparatus in 1st Embodiment to which this invention is applied. It is the block diagram which showed the control structure which concerns on the hot water supply apparatus of 1st Embodiment. It is a flowchart which shows the outline control operation | movement of the hot water operation control which the control apparatus 100 of 1st Embodiment performs. It is a schematic diagram which shows an example of the operation state of the hot water supply apparatus of 1st Embodiment. It is a schematic diagram which shows an example of the operation state of the hot water supply apparatus of 1st Embodiment. It is a schematic diagram which shows an example of the operation state of the hot water supply apparatus of 1st Embodiment. It is a schematic diagram which shows an example of the operation state of the hot water supply apparatus of 1st Embodiment. It is a flowchart which shows the general | schematic control operation of the hot water operation control of 2nd Embodiment. It is a flowchart which shows the general | schematic control action of the hot water operation control of 3rd Embodiment. It is the schematic diagram which showed schematic structure of the hot water supply apparatus in 4th Embodiment. It is a flowchart which shows the general | schematic control action of the hot water operation control of 4th Embodiment. It is a schematic diagram which shows an example of the operating state of the hot water supply apparatus of 4th Embodiment. It is a schematic diagram which shows an example of the operating state of the hot water supply apparatus of 4th Embodiment. It is a schematic diagram which shows an example of the operating state of the hot water supply apparatus of 4th Embodiment. It is a schematic diagram which shows an example of the operating state of the hot water supply apparatus of 4th Embodiment. It is a schematic diagram which shows an example of the operating state of the hot water supply apparatus of 4th Embodiment. It is a flowchart which shows the general | schematic control action of the hot water operation control of 5th Embodiment. It is a flowchart which shows the general | schematic control action of the hot water operation control of 6th Embodiment. It is the schematic diagram which showed schematic structure of the hot water supply apparatus in other embodiment. It is the schematic diagram which showed schematic structure of the hot water supply apparatus in other embodiment. It is the schematic diagram which showed schematic structure of the hot water supply apparatus in other embodiment. It is the schematic diagram which showed schematic structure of the hot water supply apparatus in other embodiment.

Explanation of symbols

1 Heat pump unit (heat pump device, boiling means)
2 Hot water storage tank (tank)
3 Heat exchanger for hot water supply 3a Primary side passage 3b Secondary side passage 4, 4A Auxiliary heat source device (heating means)
8 Primary circulation path (circulation circuit)
9 Circulation pump (circulation means)
17 Hot water storage thermistor (heat quantity detection means)
41 Reheating heat source (reheating means)
90 Bathtub 100 Control device (control means)
TH1 hot water storage thermistor (temperature detection means)

Claims (7)

A tank (2) for storing a heat medium therein;
Temperature detecting means (TH1) for detecting the temperature of the upper heating medium in the tank (2);
A hot water supply heat exchanger (3) for heating hot water for filling the bathtub (90) by heat exchange with the heat medium from the tank (2);
Combustion-type heating means (4) for heating either the heat medium stored in the tank (2) or the hot water flowing out of the hot water supply heat exchanger (3);
Reheating means (41) for reheating and heating the hot water after filling in the bathtub (90);
Control means (for controlling the operation of the heating means (4) and the reheating means (41) based on the temperature detected by the temperature detection means (TH1) when filling the bath (90). 100), and
The control means (100)
When the temperature detected by the temperature detecting means (TH1) is equal to or higher than a first predetermined temperature determined based on a hot water filling temperature in the bathtub (90), the heating means (4) and the reheating means (41) while prohibiting the operation, hot water is heated with a heat medium derived from the tank (2) to fill the bathtub (90),
When the detected temperature of the temperature detecting means (TH1) is lower than the first predetermined temperature and is equal to or higher than a second predetermined temperature determined based on a water supply temperature to the hot water supply heat exchanger (3). The hot water is heated in the bath (90) by a heating medium derived from the upper part of the tank (2) while prohibiting the operation of the heating means (4), and the reheating means ( 41) is operated, and the hot water in the bathtub (90) is set to the hot water setting temperature. The control means (100)
Even if the amount of heat of the heat medium stored in the tank (2) prohibits the operation of the heating means (4) and the reheating means (41), the hot water set temperature in the bathtub (90) is maintained. Judge whether the amount of heat is enough to fill the hot water,
When the temperature detected by the temperature detection means (TH1) is equal to or higher than the first predetermined temperature and the amount of heat of the heat medium stored in the tank (2) is equal to or higher than the amount of heat that can be filled with hot water, Heating the hot water with a heat medium derived from the tank (2) while prohibiting operation of the heating means (4) and the reheating means (41), and filling the bathtub (90) with hot water,
When the temperature detected by the temperature detecting means (TH1) is less than the first predetermined temperature or the amount of heat of the heat medium stored in the tank (2) is less than the amount of heat that can be filled, the heating While the operation of the means (4) is prohibited, the hot water is heated with a heat medium derived from the upper part of the tank (2) to fill the bathtub (90), and after the hot water filling, the reheating means (41) is The hot water supply device according to claim 1 , wherein the hot water supply is operated to set the hot water in the bathtub (90) to the hot water filling set temperature. A circulation circuit (8) for guiding an upper heat medium in the tank (2) to a lower part in the tank (2) via a primary passage (3a) of the hot water supply heat exchanger (3);
Circulation means (9) for circulating a heat medium in the circulation circuit (8),
The control means (100) is configured such that the temperature of the heat medium flowing out from the primary side passage (3a) of the hot water supply heat exchanger (3) is changed to the secondary side passage (3b) of the hot water supply heat exchanger (3). ) And adjusting the circulation amount of the heat medium by controlling the operating state of the circulation means (9) so as to approach a predetermined temperature determined based on the temperature of the feed water flowing into the heat exchanger and the heat exchange performance of the hot water heat exchanger. The hot-water supply apparatus of Claim 1 or Claim 2 characterized by these. Any of claims 1 to 3, characterized in that it comprises a heat pump device (1) for storing and boiled at the bottom of the heat medium in said tank (2) on top of said tank (2) 1 Hot water supply device described in one . A tank (2) for storing hot water for filling in the bathtub (90);
Temperature detecting means (TH1) for detecting the temperature of hot water in the upper part of the tank (2);
Combustion-type heating means (4) for heating the hot water before filling in the bathtub (90);
Reheating means (41) for reheating and heating the hot water after filling in the bathtub (90);
Control means (for controlling the operation of the heating means (4) and the reheating means (41) based on the temperature detected by the temperature detection means (TH1) when filling the bath (90). 100), and
The control means (100)
When the temperature detected by the temperature detecting means (TH1) is equal to or higher than a first predetermined temperature determined based on a hot water filling temperature in the bathtub (90), the heating means (4) and the reheating means Hot water discharged from the tank (2) while prohibiting the operation of (41) is filled in the bathtub (90),
When the temperature detected by the temperature detection means (TH1) is less than the first predetermined temperature and is equal to or higher than a second predetermined temperature determined based on the temperature of the water supplied to the tank (2), the heating means The hot water discharged from the upper part of the tank (90) is filled in the bathtub (90) while prohibiting the operation of (4), and the reheating means (41) is operated after the filling to operate the bathtub (90 The hot water supply apparatus is set to the hot water filling set temperature. The control means (100)
Even if the amount of heat of hot water stored in the tank (2) prohibits the operation of the heating means (4) and the reheating means (41), the hot water of the hot water set temperature in the bathtub (90) To determine whether the amount of heat is more than enough
When the temperature detected by the temperature detection means (TH1) is equal to or higher than the first predetermined temperature, and the amount of hot water stored in the tank (2) is equal to or higher than the amount of heat that can be filled, Hot water discharged from the tank (2) while hot water (4) and the operation of the reheating means (41) are prohibited is filled in the bathtub (90),
When the temperature detected by the temperature detecting means (TH1) is less than the first predetermined temperature, or when the amount of hot water stored in the tank (2) is less than the amount of heat that can be filled, the heating means Hot water discharged from the upper part of the tank (2) is filled in the bathtub (90) while prohibiting the operation of (4), and after the hot water is filled, the reheating means (41) is operated to operate the bathtub (90 The hot-water supply device according to claim 5 , wherein the hot-water inside is set to the hot-water filling preset temperature. The hot water supply device according to claim 5 or 6 , comprising a heat pump device (1) for boiling hot water in the lower part of the tank (2) and storing it in the upper part of the tank (2). .

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