JP5245217B2 - Hot water storage hot water heater - Google Patents

Description

  The present invention boils hot water supply fluid using a heat pump heat source device comprising a heat pump cycle, performs hot water supply using the hot water supply fluid stored in the hot water storage tank, and heats the brine using the hot water supply fluid. In addition, the present invention relates to a hot water storage type hot water supply and heating device that circulates the heated brine to a heater to perform heating or drying.

  Conventionally, as this type of hot water supply and heating device, for example, as shown in FIG. 20, a hot water storage tank 11 for storing hot water as a hot water supply fluid, a compressor 21, a water heat exchanger 22 as a radiator, a decompressor And a heat pump heat source device 20 composed of a heat pump cycle R having an air heat exchanger 24, and the low temperature hot water taken out from the lower part of the hot water storage tank 11 in the hot water supply fluid heating circuit K1 is heated. Water is passed through the hot water passage 22b of the exchanger 22 and boiled by the heat pump heat source device 20, and the hot water thus heated (for example, about 75 to 90 ° C.) is returned to the upper part of the hot water storage tank 11 to store hot water. Along with that, hot water is supplied using the hot water.

  Reference numeral 34 shown in the figure denotes a water brine heat exchanger that heats the brine flowing through the secondary flow path 34b by flowing hot water (for example, about 75 to 90 ° C.) through the primary flow path 34a. Then, the hot water supply water taken out from the upper part of the hot water storage tank 11 by the brine heating circuit K2 is circulated to the water brine heat exchanger 34 and then returned to the lower part of the hot water storage tank 11.

  The brine heated by the water brine heat exchanger 34 in the brine circulation circuit Bj is circulated between the heater 31 and heating or drying is performed. That is, the hot water stored in the hot water storage tank 11 is used as a heat source, the brine is heated, the brine heated by the heater 31 is dissipated, and heating or drying is performed. Yes.

  In addition, since the code | symbol which is not demonstrated shown in the figure respond | corresponds with the code | symbol in embodiment of this invention mentioned later, description here is abbreviate | omitted.

  However, with the above-described configuration, when the hot water supply water at a high temperature (for example, about 75 to 90 ° C.) is used to circulate in the brine heating circuit K2, the usage time of the heater 31 becomes long, especially in winter. Accordingly, a large amount of hot water at an intermediate temperature (for example, about 40 to 60 ° C.) is stored in the hot water storage tank 11.

  In other words, when a large amount of hot water having medium temperature is stored, the hot water supply water cannot be used for hot water supply and heating and the heat pump heat source device 20 needs to be heated up without being used up. Moreover, when the heating operation of the heat pump heat source apparatus 20 is performed, there is a problem that the COP (coefficient of performance) of the heat pump cycle is lowered due to an increase in the inflow temperature of hot water flowing into the water heat exchanger 22.

  Further, in this type of heat pump heat source device 20, when the inflow temperature of hot water flowing into the water heat exchanger 22 is constant, the temperature of the hot water flowing out from the water heat exchanger 22 (boiling temperature) is increased. There is a problem that the COP (coefficient of performance) of the heat pump cycle decreases.

  In view of the above, an object of the present invention is to provide a hot water storage type hot water supply and heating device that can positively use a medium temperature hot water supply fluid for heating and improve the COP of a heat pump heat source machine. It is to provide.

In order to achieve the above object, the technical means described in claims 1 to 4 are employed. That is, in the invention described in claim 1, it has a hot water storage tank (11) for storing hot water supply fluid, a compressor (21), and a radiator (22), and the radiator (22) has a hot water storage tank ( The heat pump heat source device (20) that conducts a boiling operation by passing a low-temperature hot water supply fluid from 11) and the low-temperature hot water supply fluid taken out from the lower part of the hot water storage tank (11) are boiled by the heat pump heat source device (20). The hot water supply fluid heating circuit (K1) which returns the heated hot water supply fluid to the upper part of the hot water storage tank (11), the primary flow path (34a) through which the hot water supply fluid passes, and the brine 2 pass through. A water brine heat exchanger (34) having a secondary flow path (34b) for heating the brine by the hot water supply fluid, and a hot water supply fluid taken out from the hot water storage tank (11) to the water brine heat exchanger (34) After being distributed to A hot water storage type hot water supply / heater provided with a brine heating circuit (K2) for returning to the lower part of the hot water tank (11) and a heater (31) for radiating the brine heated by the water brine heat exchanger (34) for heating purposes. In the device
An intermediate hot water extraction path (14) for extracting an intermediate temperature hot water supply fluid from the hot water storage tank (11) is provided,
The hot water supply fluid heating circuit (K1) and the brine heating circuit (K2) are a hot water supply fluid boiled up by the heat pump heat source unit (20), an intermediate temperature hot water supply fluid extracted from the intermediate temperature water extraction path (14), or The hot water supply fluid taken out from the upper part of the hot water storage tank (11) is configured to flow to the brine heating circuit (K2) side,
The hot water supply fluid boiled up by the heat pump heat source unit (20) is stored when the medium temperature hot water supply fluid taken out from the intermediate temperature water extraction path (14) is circulated to the brine heating circuit (K2) side. Configured to return to the top of the tank (11),
In the hot water supply fluid heating circuit (K1) and the brine heating circuit (K2), the hot water heating fluid boiled up by the heat pump heat source device (20) is supplied to the intermediate hot water extraction path (14) side and the upper side of the hot water storage tank (11). First flow rate adjusting means (16) for switching the flow path so as to circulate to at least one of the above, and the hot water heating fluid boiled by the heat pump heat source (20) for the water-brine heat exchanger (34) side and the intermediate temperature extraction path (14) a second flow rate adjusting means (17) for switching the flow path so as to circulate to at least one side,
The first flow rate adjusting means (16) is arranged upstream of the second flow rate adjusting means (17) with respect to the flow of the hot water supply fluid boiled by the heat pump heat source unit (20),
The second flow rate adjusting means (17) is arranged in the middle of the path from the first flow rate adjusting means (16) to the intermediate hot water extraction path (14),
The first flow rate adjusting means (16) and the second flow rate adjusting means (17) close the intermediate temperature water take-out path and take out the medium temperature hot water supply fluid from the hot water storage tank (11), so that the heat pump heat source machine (20) The flow path is switched so that the hot-water supply fluid boiled in step 1 and the high-temperature hot-water supply fluid taken out from the upper part of the hot water storage tank (11) are circulated to the brine heating circuit (K2).

According to this invention, the medium temperature hot water supply fluid in the hot water storage tank (11) can be positively used for heating. Therefore, when the heating operation of the heat pump heat source unit (20) is performed, the COP of the heat pump heat source unit (20) can be improved by reducing the amount of remaining hot water of the medium temperature hot water supply fluid. Further, since the hot water storage operation can be performed simultaneously with the operation of the heater (31), for example, when the amount of stored hot water in the hot water storage tank (11) decreases, Heating operation can be performed simultaneously.

  Moreover, since the hot water supply fluid boiled by the heat pump heat source unit (20) is configured to flow to the brine heating circuit (K2) side, the boiling temperature of the heat pump heat source unit (20) is set to the heater (31). The boiling temperature can be lowered according to the temperature.

  For example, if the heater (31) is a floor heating device, the hot water supply fluid flowing to the brine heating circuit (K2) side may be heated to a medium temperature (for example, about 40 to 60 ° C.). Thereby, COP of a heat pump heat source machine (20) can be improved by lowering boiling temperature rather than high temperature.

  When the high temperature hot water supply fluid is circulated to the brine heating circuit (K2) side, for example, the high temperature hot water supply fluid is used when the brine heating circuit (K2) side starts up immediately after the start of the heating operation. The rising characteristic of (10) is good.

In the invention according to claim 2 , the intermediate hot water take-out path (14) is arranged so as to take out the medium temperature hot water supply fluid from the lower part of the hot water storage tank (11) and the intermediate part of the hot water storage tank (11), It is characterized in that either one of the lower part or the middle part can be selected.

  According to the present invention, when the amount of hot water stored in the hot water storage tank (11) is large, the medium temperature hot water supply fluid is stored in the lower part of the hot water storage tank (11), and when the amount of hot water stored in the hot water storage tank (11) is small. The hot water supply medium fluid is stored in the intermediate portion of the hot water storage tank (11). Therefore, the medium temperature hot water supply fluid can be taken out from the hot water storage tank (11) more effectively. Thereby, the medium temperature hot water supply fluid can be actively used for heating.

In the invention described in claim 3 , the hot water supply fluid heating circuit (K1) is configured to circulate the hot water supply fluid that has flowed out of the radiator (22) to the brine heating circuit (K2) side during the freezing operation. It is characterized by that.

  According to the present invention, hot water storage is performed by flowing from the hot water supply fluid heating circuit (K1) side to the upper part of the hot water storage tank (11) and the intermediate hot water extraction path (14) to the brine heating circuit (K2) side without flowing out. The freeze prevention operation of the hot water supply fluid heating circuit (K1) and the brine heating circuit (K2) can be easily performed without reducing the amount of heat of the hot water supply fluid stored in the tank (11).

The invention according to claim 4 is characterized in that the heat pump heat source unit (20) is composed of a supercritical heat pump cycle in which the refrigerant pressure on the high temperature side is equal to or higher than the critical pressure of the refrigerant. According to the present invention, a hot water supply fluid having a high temperature (for example, about 90 ° C.) can be stored in the hot water storage tank (11).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, a hot water storage type hot water heater according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing the overall configuration of the hot water storage type hot water supply / air heating apparatus of the present embodiment, and is an explanatory view showing the flow direction of hot water as a hot water supply fluid when heating operation is performed.

  FIG. 2 is a flowchart showing a control process of the heating operation by the control device 40. Moreover, FIG. 3 thru | or FIG. 10 is explanatory drawing which shows the flow direction of the hot water which is a hot water supply fluid at the time of heating operation. 11 and 12 are explanatory diagrams showing the flow direction of hot water when a hot water storage operation is performed in which hot water is stored in the hot water storage tank, and FIG. 13 is a flow direction of hot water when the freeze prevention operation is performed. It is explanatory drawing which shows.

  By the way, in FIG. 1, the heat pump heat source device 20 uses an electric expansion valve 23 as a decompressor, heats hot water as a hot water supply fluid, and generates hot water of high temperature (about 90 ° C. in this embodiment). It is a heat pump cycle.

  This supercritical heat pump cycle refers to a heat pump cycle in which the refrigerant pressure on the high pressure side is equal to or higher than the critical pressure of the refrigerant. For example, the heat pump cycle uses carbon dioxide, ethylene, ethane, nitrogen oxide, or the like as a refrigerant.

  As shown in FIG. 1, the hot water storage type hot water supply and heating device of the present embodiment is roughly divided into a tank unit 10 having a hot water storage tank 11, a heat pump heat source device 20 in which a refrigeration cycle device including a heat pump cycle R is housed, floor heating. It is comprised from the heating unit 30 provided with the apparatus 31, and the control apparatus 40. FIG.

  First, as shown in FIG. 1, the heat pump heat source unit 20 is a compressor that sucks and compresses refrigerant (carbon dioxide in the present embodiment), and the compressor 21 compresses the refrigerant by suction (see FIG. 1). And an electric motor (not shown) that drives the compression mechanism.

  Reference numeral 22 denotes a water heat exchanger that is a radiator that exchanges heat between the refrigerant discharged from the compressor 21 and hot water, and the water heat exchanger 22 flows through the refrigerant flow through the refrigerant passage 22a and the hot water supply passage 22b. It is a counterflow type heat exchanger comprised so that a hot water supply flow might oppose.

  Reference numeral 23 denotes an electric expansion valve that is a pressure reducer for reducing the pressure of the refrigerant flowing out of the water heat exchanger 22, and reference numeral 24 denotes an evaporation of the refrigerant flowing out of the electric expansion valve 23 (hereinafter referred to as the expansion valve 23). This is an air heat exchanger that absorbs heat in the atmosphere into the refrigerant and flows out the refrigerant toward an accumulator 25 (the suction side of the compressor 21) described later.

  25 is an accumulator that separates the refrigerant flowing out from the air heat exchanger 24 into a gas phase refrigerant and a liquid phase refrigerant and flows the gas phase refrigerant to the suction side of the compressor 21 and stores excess refrigerant in the heat pump cycle. is there.

  Reference numeral 24a denotes a blower capable of blowing air (outside air) to the air heat exchanger 24 and adjusting the amount of blown air. The blower 24a, the compressor 21 and the expansion valve 23 are detected from sensors (not shown). It is controlled by the control device 40 based on pressure information and temperature information.

  The hot water supply fluid heating circuit K1 includes a hot water supply passage 22b of the water heat exchanger 22 that is a means for heating hot water, and a hot water circulation pump 26 that circulates the hot water, and stores hot water in the hot water storage tank. 11 are connected in a ring shape.

  The hot water supply circulation pump 26 takes out low-temperature hot water from the suction port 11 a provided at the lower part of the hot water storage tank 11, passes it through the hot water supply passage 22 b, and returns to the discharge port 11 b provided at the upper part of the hot water storage tank 11. So that the water flow is generated.

  The hot water circulation pump 26 can adjust the flow rate according to the rotation speed of a built-in motor, and is controlled by the control device 40. Reference numeral 52 denotes a temperature sensor that detects the boiling temperature of hot water flowing out of the water heat exchanger 22, and a detection signal of the temperature sensor 52 is input to the control device 40, and hot water supply is based on the detection signal. The rotation speed of the water circulation pump 26 is controlled.

  That is, when the boiling operation is performed by operating the heat pump heat source device 20, the hot water supply fluid heating circuit K1 is circulated so that the boiling temperature of the hot water flowing out from the water heat exchanger 22 becomes the target boiling temperature. The flow rate is controlled by the number of rotations of the hot water supply circulation pump 26.

  Reference numerals 16 and 17 shown in the figure are two first and second flow rate adjusting means 16 and 17 using proportional valves that change the communication ratio between one path and the other path, This is a flow rate control valve that can switch from one path to an opening degree at which the other path communicates, and to an intermediate opening degree at which the other path communicates with each other.

  Specifically, as shown in FIG. 1, in the hot water supply fluid heating circuit K <b> 1, the first and second flow rate adjusting means 16 are provided between the outflow side of the water heat exchanger 22 and the discharge port 11 b of the hot water storage tank 11. , 17 and one of the other paths are connected to each other, and the other path of the first flow rate adjusting means 16 is connected to the brine heating circuit K2 (described later) side to connect the second flow rate. The other path of the adjusting means 17 is connected to the intermediate temperature extraction path 14 (described later).

  In other words, one of the first flow rate adjusting means 16 switches to either one of circulating hot water flowing out of the water heat exchanger 22 to the brine heating circuit K2 or circulating it to the upper part of the hot water storage tank 11. The hot water supply fluid heating circuit K1, the brine heating circuit K2, and the upper part of the hot water storage tank 11 are switched to communicate with each other.

  The other second flow rate adjustment means 17 distributes the hot water flowing out of the water heat exchanger 22 to one path of the first flow rate adjustment means 16 or to the intermediate temperature extraction path 14. In addition to switching, the fluid heating circuit K1 for hot water supply, one path of the first flow rate adjusting means 16 and the intermediate portion of the hot water storage tank 11 are switched to communicate with each other. Then, the opening degree is controlled by the control device 40 (details will be described later).

  Thus, by combining the two flow rate adjusting means 16 and 17, the hot water supply fluid heating circuit K1, the brine heating circuit K2, the upper part of the hot water storage tank 11, and the intermediate part of the hot water storage tank 11 are communicated with each other. .

  Next, the tank unit 10 includes a hot water storage tank 11 and piping connected to the hot water storage tank 11. The hot water storage tank 11 is made of metal (for example, made of stainless steel) excellent in corrosion resistance, is formed in a vertically long shape, and a heat insulating material (not shown) is arranged on the outer peripheral portion, so that hot hot water is kept warm for a long time. Be able to.

  An inlet 11c is provided on the bottom surface, and a water supply pipe 12 for introducing tap water into the hot water storage tank 11 is connected to the inlet 11c. In addition, upstream of the water supply pipe 12 is connected to tap water through a pressure reducing check valve and an on-off valve (not shown) so as to introduce tap water having a predetermined pressure.

  On the other hand, an outlet 11d is provided at the uppermost part of the hot water storage tank 11, and hot water of high temperature (for example, 75 to 90 ° C.) out of hot water stored in the hot water storage tank 11 is led to the outlet 11d. A high-temperature take-out path 13 is connected.

  A discharge pipe provided with a relief valve (not shown) is connected in the middle of the high-temperature take-out path 13, and when the pressure in the hot water tank 11 rises above a predetermined pressure, The hot water is discharged outside so as not to damage the hot water storage tank 11 and the like.

  Further, reference numeral 14 shown in the figure denotes a medium temperature take-out for taking out hot hot water stored in the hot water storage tank 11 at a medium temperature (for example, 40 to 60 ° C.) having a hot water temperature lower than that of the hot hot water. The hot water storage medium 11 is taken out from any one of the outlets 11e and 11f formed at the substantially intermediate part in the vertical direction of the hot water storage tank 11 and the lower part below the intermediate part.

  More specifically, the take-out pipe 14a is connected to the outlet 11e, the take-out pipe 14b is connected to one outlet 11f, and the downstream ends of the take-out pipes 14a and 14b are connected to the three-way valve 15, respectively. Yes. The other side of the three-way valve 15 is connected to the upstream end of the intermediate temperature extraction path 14.

  The three-way valve 15 is a switching valve for selecting either the outlet 11e or the outlet 11f and taking out the medium temperature hot water in the hot water storage tank 11 to the intermediate temperature extraction path 14, and is controlled by the control device 40. .

  This is because when the amount of hot water stored in the hot water storage tank 11 is large, medium temperature hot water is stored in the lower part of the hot water storage tank 11, and when the amount of hot water stored in the hot water storage tank 11 is small, the intermediate temperature hot water is stored in the intermediate portion of the hot water storage tank 11. Water is stored. In other words, it is possible to more effectively take out the medium temperature hot water that changes in accordance with the amount of hot water stored.

  Note that a branch point A is provided in the middle of the intermediate temperature extraction path 14, and one of the other paths of the second flow rate adjusting means 17 is connected to the branch point A. Further, a high / medium temperature mixing valve 18 that is a flow rate adjusting valve is provided at a downstream side joining portion of the high temperature extraction path 13 and the intermediate temperature extraction path 14.

  The high / medium temperature mixing valve 18 is a temperature control valve that adjusts the hot water temperature of the hot water supplied to the hot water supply mixing valve 19 provided on the downstream side thereof. The mixing ratio between the hot hot water extracted from the path 13 and the intermediate hot water extracted from the intermediate temperature extracting path 14 is adjusted.

  The high / medium temperature mixing valve 18 is electrically connected to the control device 40 and controlled based on temperature information from a temperature sensor (not shown). For example, the hot water supplied from the intermediate temperature extraction path 14 is actively mixed so that the temperature of the hot water flowing through the hot water mixing valve 19 becomes a predetermined temperature (set temperature + 2 ° C.). The temperature is adjusted to a predetermined temperature.

  A hot water supply pipe 13 a is connected to the downstream side of the high / medium temperature mixing valve 18. The hot water supply pipe 13a is a pipe for introducing hot water whose temperature is adjusted to a set temperature to a hot water tap, a shower faucet, etc. (not shown) provided at the downstream end of the hot water supply pipe 13a. 19 is provided.

  The hot water supply mixing valve 19 is a temperature control valve that adjusts the temperature of hot water to be discharged at the end of the hot water supply pipe 13a, and the ratio of the respective opening areas (on the hot water side adjusted by the high / medium temperature mixing valve 18). The temperature of the hot water discharged is adjusted to the set temperature by adjusting the ratio of the opening and the opening on the water side communicating with the water supply pipe 12. The high and medium temperature mixing valve 18 and the hot water supply mixing valve 19 are electrically connected to the control device 40 and controlled based on temperature information from each temperature sensor (not shown).

  In addition, a plurality of hot water storage thermistors 51a to 51f, which are water temperature sensors for detecting the amount of hot water stored or the temperature of the stored hot water, are arranged on the outer wall surface of the hot water storage tank 11 at substantially equal intervals in the vertical direction (the height direction of the hot water storage tank 11). The temperature information at each water level of the hot water supply that is arranged and filled in the hot water storage tank 11 is output to the control device 40.

  Thus, the boundary position between the hot water heated above the hot water tank 11 and the low temperature hot water before heated below the hot water tank 11 can be detected, and the hot water temperature of the hot water at each water level. Can be detected. Of the hot water storage thermistors 51a to 51f, the thermistors 51b to 51e provided in the vicinity of the outlets 11e and 11f are sensors for detecting the hot water storage temperature of the medium-temperature hot water.

  Next, the heating unit 30 includes a brine heating circuit K2 that heats the brine and a brine circulation circuit Bj to the heater 31 that includes a floor heating device. The brine heating circuit K2 includes a water brine heat exchanger 34 that is a means for heating brine, a heat source water circulation pump 32 that circulates hot water as a heat source in a primary flow path 34a of the water brine heat exchanger 34, and The hot water storage tank 11 is connected in an annular shape.

  The water brine heat exchanger 34 is a heat exchanger that heats the brine by exchanging heat between the hot water stored in the hot water storage tank 11 and the brine, and the hot water flow and the secondary side flowing in the primary channel 34a. This is a counter flow type heat exchanger configured to face the brine flow flowing in the flow path 34b.

  The upstream end of the primary flow path 34 a of the water brine heat exchanger 34 is connected to one of the other paths of the first flow rate adjusting means 16, and is connected to the upper part of the hot water storage tank 11 via the first flow rate adjusting means 16. It is provided to communicate. Further, the upstream end of the primary flow path 34 a of the water brine heat exchanger 34 communicates with the intermediate portion of the hot water storage tank 11 via the first flow rate adjusting means 16 and the second flow rate adjusting means 17.

  Further, the downstream end of the primary flow path 34 a of the water brine heat exchanger 34 is connected to an inlet 11 g provided at the lower part of the hot water storage tank 11. The heat source water circulation pump 32 takes out the hot water switched by the first and second flow rate adjusting means 16, 17, passes the hot water through the primary flow path 34 a of the water brine heat exchanger 34, and lowers the hot water storage tank 11. It is a pump that generates a water flow so as to return to the provided inlet 11g.

  The heat source water circulation pump 32 can adjust the flow rate according to the rotation speed of the built-in motor, and is controlled by the control device 40. Reference numeral 53 shown in the figure is a temperature sensor that detects the outlet temperature of the brine flowing out from the secondary side flow path 34b of the water brine heat exchanger 34, and the detection signal of this temperature sensor 53 is sent to the control device 40. The rotation speed of the heat source water circulation pump 32 is controlled based on this detection signal.

  That is, when the heating unit 30 is operated to perform the heating operation, the flow rate through the brine heating circuit K2 is set so that the outlet temperature of the brine flowing out from the water brine heat exchanger 34 becomes the target outlet temperature. The number of rotations is controlled.

  When the heating operation is performed, the hot water circulated in the brine heating circuit K2 is the hot water selected by the two second flow rate adjusting means 16 and 17 provided in the hot water fluid heating circuit K1. Is done. Specifically, high-temperature or medium-temperature hot water boiled by the heat pump heat source device 20, medium-temperature hot water taken out from the medium-temperature water extraction path 14, or high-temperature hot water taken out from the upper part of the hot water storage tank 11. Either one is distributed.

  The brine circulation circuit Bj includes a water brine heat exchanger 34 that is a heating means of the brine, a brine circulation pump 33 that circulates the brine in the secondary flow path 34b of the water brine heat exchanger 34, and a heater 31. And connected in a ring shape. The heater 31 is a piping panel arranged under the floor board of a residential room.

  The brine circulation pump 33 can adjust the flow rate according to the rotation speed of the built-in motor, and is controlled by the control device 40. Note that such a floor heating device supplies brine to the heater 31 at a temperature of about 60 ° C. at which the brine does not feel hot so that a comfortable heating feeling can be obtained even if the human body directly touches the flooring, and does not feel cold. The rotation speed of the brine circulation pump 33 is controlled by the control device 40 so that the flow rate returns to the heater 31 at a temperature of about 0C.

  The control device 40 is composed mainly of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program. Temperature information from the sensors 51a to 51f, 52, 53, and the like. On the basis of pressure information and operation information from an operation panel (not shown), various refrigeration cycle components 21 and 23, three-way valve 15, first and second flow rate adjusting means 16 and 17, high and medium temperature mixing valve 18 and hot water mixing valve 19 And the actuators of the various circulation pumps 26, 32, 33 are controlled.

  Next, the operation of the hot water storage type hot water heater with the above configuration will be described. The operation of the hot water storage hot water heater is roughly divided into a heating operation in which the brine heating circuit K2 and the brine circulation circuit Bj are operated, and a hot water storage in which hot water is stored in the hot water storage tank 11 by operating the heat pump heat source 20. There are an operation and a freeze prevention operation in the hot water supply fluid heating circuit K1 and the brine heating circuit K2 in which hot water is stagnated when the outside air temperature is low.

  By the way, in this embodiment, at the time of heating operation, to the brine heating circuit K2, the hot or hot hot water boiled by the heat pump heat source unit 20, the hot hot water taken out from the hot hot water extraction path 14, or Control is performed so that any one of hot hot water taken out from the upper part of the hot water storage tank 11 flows.

  More specifically, the heating operation will be described based on the flowchart shown in FIG. First, as shown in FIG. 2, it is determined in step 410 whether or not a heating operation switch (not shown) has been turned ON. Here, if the heating operation switch is ON, the control process is started, and if it is OFF, the control process is on standby.

  When the heating operation control process is started, it is determined in step 420 whether or not the hot water storage temperature in the vicinity of the intermediate portion of the hot water storage tank 11 detected by the hot water storage thermistors 51a to 51f is less than a predetermined value. That is, it is monitored whether the hot water stored in the vicinity of the intermediate portion of the hot water storage tank 11 is hot water having an intermediate temperature (for example, about 40 ° C.) or more. Here, the hot water storage temperature in the vicinity of the intermediate portion is a predetermined value ( For example, if the temperature is less than about 40 ° C., the process proceeds to step 430, and if it is equal to or greater than the predetermined value, the process proceeds to step 470.

  In step 430, it is determined whether or not the heating operation is in a startup state. Specifically, if it is an excessive state due to a temperature change in the outlet temperature of the brine flowing out of the water brine heat exchanger 34 detected by the temperature sensor 53, it is determined that the power supply is in a startup state, and the temperature change is stable. If it is not in the startup state, it is determined. That is, it is monitored whether or not it is an excessive state immediately after starting the heating operation.

  Here, if it is a start-up state, in step 440, the heat pump heat source unit 20 is operated to perform a high temperature (for example, about 90 ° C.) boiling operation, and the high temperature boiled by the heat pump heat source unit 20 is increased. Control is performed to distribute hot water directly to the brine heating circuit K2.

  Here, if it is not a start-up state, in step 450, the heat pump heat source unit 20 is operated to perform a boiling operation at an intermediate temperature (for example, about 40 to 60 ° C.), and the heat pump heat source unit 20 is boiled up. Control is performed to distribute the medium-temperature hot water supply directly to the brine heating circuit K2.

  In other words, in step 420, the hot water stored in the vicinity of the intermediate portion in the hot water storage tank 11 cannot be used because the hot water storage temperature is lower than the predetermined value, so in step 440 or step 450, the hot water supply fluid heating circuit is used. This is a control process in which the hot water heated at K1 is directly circulated to the brine heating circuit K2 side for direct heating.

  By the way, when direct heating is performed in steps 440 and 450, the flow rate flowing through the brine heating circuit K2 is such that the outlet temperature of the brine flowing out of the secondary flow path 34b of the water brine heat exchanger 34 is the target outlet temperature. The flow rate is controlled to be

  On the other hand, the flow rate of the hot water flowing through the hot water supply fluid heating circuit K1 is a flow rate that is controlled so that the boiling temperature of the hot water flowing out of the water heat exchanger 22 becomes the target boiling temperature. That is, the flow rate flowing through the brine heating circuit K2 is different from the flow rate flowing through the hot water supply fluid heating circuit K1. Therefore, the operation differs depending on the relationship between the flow rate on the hot water supply fluid heating circuit K1 side and the flow rate on the brine heating circuit K2 side.

  Therefore, in the present embodiment, when the flow rate flowing through the hot water supply fluid heating circuit K1 is larger than the flow rate flowing through the brine heating circuit K2, hot water heated by the heat pump heat source unit 20 is stored in the hot water storage tank 11. When the flow rate flowing through the hot water supply fluid heating circuit K1 is smaller than the flow rate flowing through the brine heating circuit K2, the hot or hot hot water stored in the hot water storage tank 11 is circulated to the brine heating circuit K2 side. It is configured to do.

  More specifically, since it corresponds by controlling the opening degree of the two flow rate adjusting means 16 and 17 provided in the fluid heating circuit K1 for hot water supply, description will be made in order. First, in step 440, when the flow rate on the hot water supply fluid heating circuit K1 side is larger than the flow rate on the brine heating circuit K2 side, which is the flow rate required for heating, as shown in FIG. The opening is controlled.

  More specifically, the first flow rate adjusting means 16 is switched to an intermediate opening degree at which the other path communicates with each other, and the second flow rate adjusting means 17 is switched between the outflow side of the hydrothermal exchanger 22 and the intermediate temperature take-out path 14. Switch to an opening that allows A to communicate. Thereby, hot hot water boiled by the heat pump heat source device 20 is circulated to the brine heating circuit K2 side (arrow b shown in the drawing), and the first flow rate adjusting means 16 is used to supply the hot water supply fluid heating circuit K1. Excess hot water is discharged to the upper part of the hot water storage tank 11 (arrow c shown in the figure). That is, the hot excess hot water is stored in the hot water storage tank 11.

  In the hot water supply fluid heating circuit K1, the brine heating circuit K2, and the brine circulation circuit Bj, hot water and brine are circulated as indicated by arrows on the circuit in the figure. With the above operation, the hot hot water boiled by the heat pump heat source unit 20 flows to the brine heating circuit K <b> 2 side, and high-temperature surplus hot water is stored in the upper portion of the hot water storage tank 11.

  As a result, hot hot water is circulated through the primary flow path 34a of the water brine heat exchanger 34, so that the brine circulated through the secondary flow path 34b of the water brine heat exchanger 34 reaches a predetermined temperature. Rise characteristics are good. Furthermore, surplus hot hot water heated by the heat pump heat source device 20 can be stored in the hot water storage tank 11.

  Next, when the flow rate on the hot water supply fluid heating circuit K1 side is smaller than the flow rate on the brine heating circuit K2 side in step 440, as shown in FIG. 3, the two first and second flow rate adjusting means 16, 17 are used. The opening is controlled so as to keep the state as it is.

  In this case, the hot hot water boiled by the heat pump heat source device 20 is circulated to the brine heating circuit K2 side (arrow b shown in the figure), and the hot hot water stored in the upper part of the hot water storage tank 11 is stored. Is distributed to the brine heating circuit K2 side (arrow c shown in the figure). That is, the shortage on the brine heating circuit K2 side flows out of the hot water storage tank 11.

  At step 440, when the flow rate on the hot water supply fluid heating circuit K1 side becomes substantially equal to the flow rate on the brine heating circuit K2 side, as shown in FIG. , 17 is controlled so as to keep the state as it is.

  In this case, the upper part of the hot water storage tank 11 and the brine heating circuit K2 side communicate with each other (broken line c shown in the figure), but all of the hot hot water boiled by the heat pump heat source unit 20 is the brine heating circuit. It is distributed to the K2 side (arrow b shown in the figure).

  When the start-up state has elapsed, in step 430, when the temperature change of the outlet temperature of the brine flowing out of the water brine heat exchanger 34 detected by the temperature sensor 53 becomes stable, the process proceeds to step 450.

  Step 450 is an operation mode for switching from a high temperature (for example, about 90 ° C.) boiling operation to a medium temperature (for example, about 40 to 60 ° C.) boiling operation. Again, the action differs depending on the relationship between the flow rate on the hot water supply fluid heating circuit K1 side and the flow rate on the brine heating circuit K2 side.

  First, when the flow rate on the hot water supply fluid heating circuit K1 side is larger than the flow rate on the brine heating circuit K2 side, as shown in FIG. 5, the second flow rate adjusting means 17 is switched to an intermediate opening degree where the other path communicates with each other. At the same time, the first flow rate adjusting means 16 is switched to an opening degree at which one path and the other path communicate. That is, the first flow rate adjusting means 16 is controlled to an opening degree that allows the outflow side of the water heat exchanger 22 and the primary side flow path 34a of the water brine heat exchanger 34 to communicate with each other.

  As a result, the hot water heated at the medium temperature (for example, about 40 to 60 ° C.) boiled by the heat pump heat source device 20 is circulated to the brine heating circuit K2 side (arrow b shown in the figure), and the second flow rate adjusting means 17, surplus hot water on the hot water supply fluid heating circuit K1 side is discharged to the intermediate temperature extraction path 14.

  And hot water of medium temperature is stored in the intermediate part of the hot water storage tank 11 downstream of the medium temperature take-out path 14 (arrow c shown in the figure). Therefore, since the medium temperature hot water is circulated through the primary flow path 34a of the water brine heat exchanger 34, the temperature is lower than that of the high temperature hot water, thereby reducing the heat loss on the brine heating circuit K2 side. I can plan. In addition, the COP can be improved by lowering the boiling temperature of the heat pump heat source unit 20 than in Step 440.

  In this case, even if the flow rate on the brine heating circuit K2 side is reduced, if the outlet temperature of the brine flowing out of the secondary flow path 34b of the water brine heat exchanger 34 exceeds the target outlet temperature, the second It is preferable to control the flow rate adjusting means 17 so that the other path leading to the brine heating circuit K2 side is not the intermediate opening degree.

  In step 450, when the flow rate on the hot water supply fluid heating circuit K1 side is smaller than the flow rate on the brine heating circuit K2 side, as shown in FIG. The opening is controlled so as to keep the state as it is.

  In this case, the medium-temperature hot water boiled by the heat pump heat source device 20 is circulated to the brine heating circuit K2 side (arrow b shown in the figure), and the intermediate portion of the hot water storage tank 11 via the medium-temperature extraction path 14 The hot water stored in the hot water is circulated to the brine heating circuit K2 side (arrow c shown in the figure). That is, the shortage on the brine heating circuit K2 side flows out from the intermediate portion in the hot water storage tank 11.

  In step 450, when the flow rate on the hot water supply fluid heating circuit K1 side becomes substantially equal to the flow rate on the brine heating circuit K2 side, as shown in FIG. 7, two first and second flow rate adjusting means 16 are provided. , 17 is controlled so as to keep the state as it is.

  In this case, the intermediate portion of the hot water storage tank 11 and the brine heating circuit K2 side communicate with each other (broken line c in the figure), but all of the medium-temperature hot water boiled by the heat pump heat source unit 20 is heated by brine. It is distributed (arrow b shown in the figure) to the circuit K2 side.

  In the above steps 440 and 450, the flow rate on the hot water supply fluid heating circuit K1 side is excessive or insufficient due to the relationship between the flow rate on the hot water supply fluid heating circuit K1 side and the flow rate on the brine heating circuit K2 side. The hot water storage tank 11 can easily adjust absorption and discharge. That is, excess and deficiency can be covered by the hot water storage tank 11.

  Next, in step 460 (see FIG. 2), it is determined whether or not the hot water storage temperature in the vicinity of the intermediate portion of the hot water storage tank 11 detected by the hot water storage thermistors 51a to 51f is equal to or higher than a predetermined value. That is, since the brine heating circuit K2 side is operated in step 440 or step 450, the medium-temperature hot water supply water is returned to the hot water storage tank 11, and the hot water storage temperature is monitored and the hot water storage temperature is less than a predetermined value. In this case, hot water boiled by the heat pump heat source unit 20 is circulated to the brine heating circuit K2 side. Here, if the hot water storage temperature is equal to or higher than the predetermined value, the routine proceeds to step 470.

  Then, after determining whether or not the heating operation is in the startup state in step 470, if it is in the startup state, in step 480, the hot hot water stored in the hot water storage tank 11 is supplied to the brine heating circuit. Control is made to circulate to the K2 side, and if it is not in the startup state at step 470, control is made to circulate the medium temperature hot water stored in the hot water storage tank 11 to the brine heating circuit K2 side at step 490. To do.

  More specifically, when the hot hot water in the hot water storage tank 11 is used as a heat source for heating in step 480, as shown in FIG. 8, the first flow rate adjusting means 16 communicates with the other path. While switching to the intermediate opening, the second flow rate adjusting means 17 is switched to an opening that allows one of the paths to communicate with the other path.

  That is, in the second flow rate adjusting means 17, the opening degree is switched so that the outflow side of the water heat exchanger 22 and the branch point A of the intermediate temperature extraction path 14 communicate with each other. Thereby, the upper part of the hot water storage tank 11 and the outflow side of the water heat exchanger 22 are communicated with each other by the first flow rate adjusting means 16. Therefore, the hot hot water stored in the hot water storage tank 11 is distributed to the brine heating circuit K2 side (arrow a shown in the figure).

  When the start-up state has elapsed, in step 470, when the temperature change of the outlet temperature of the brine flowing out of the water brine heat exchanger 34 detected by the temperature sensor 53 becomes stable, the process proceeds to step 490.

  Step 490 is a mode in which medium temperature hot water in the hot water storage tank 11 is used as a heat source for heating. Specifically, as shown in FIG. 9, the second flow rate adjusting means 17 is switched to an intermediate opening degree in which the other path communicates with each other, and the first flow rate adjusting means 16 is switched between one path and the other path. Switch to the opening to communicate.

  That is, the second flow rate adjusting means 17 switches to the intermediate opening degree at which the outflow side of the water heat exchanger 22 communicates with the branch point A of the intermediate temperature extraction path 14. Further, in the first flow rate adjusting means 16, the opening degree is switched so that the outflow side of the water heat exchanger 22 and the primary flow path 34 a of the water brine heat exchanger 34 communicate with each other.

  As a result, the second flow rate adjusting means 17 causes the intermediate portion of the hot water storage tank 11 to communicate with the primary flow path 34 a of the water brine heat exchanger 34. Therefore, the medium-temperature hot water stored in the hot water storage tank 11 is distributed to the brine heating circuit K2 side (arrows a and b shown in the drawing).

  According to the control processing after step 470, when hot water having an intermediate temperature or higher is stored near the intermediate portion in the hot water storage tank 11, the hot water in the hot water storage tank 11 is positively used as a heat source for heating. By being able to do so, the hot water temperature of the hot water stored under the hot water storage tank 11 can be lowered. Therefore, the COP can be improved by reducing the inflow temperature flowing into the water heat exchanger 22 when the heating operation is performed by the heat pump heat source apparatus 20.

  In the present embodiment, the two first and second flow rate adjusting means 16 are arranged so that the hot water supply fluid heating circuit K1 side and the brine heating circuit K2 side communicate with each other when heating is performed directly in steps 440 and 450. However, the present invention is not limited to this, and as shown in FIG. 10, the hot water heated by the heat pump heat source unit 20 is stored in the intermediate portion of the hot water storage tank 11. May be.

  Specifically, one of the first flow rate adjusting means 16 is switched to an intermediate opening degree at which the upper part of the hot water storage tank 11 and the primary side flow path 34a of the water brine heat exchanger 34 communicate with each other. The other first flow rate control means 16 is switched to an opening degree at which the outflow side of the water heat exchanger 22 and the branch point A of the intermediate temperature extraction path 14 communicate with each other.

  Accordingly, the outflow side of the water heat exchanger 22 and the upper part of the hot water storage tank 11 are communicated with each other, and the outflow side of the water heat exchanger 22 and the intermediate temperature extraction path 14 are communicated with each other. Thus, when the boiling temperature at the start of the direct heating operation is low, the hot water heated by the heat pump heat source unit 20 flows through the intermediate temperature extraction path 14 to the middle or lower part of the hot water storage tank 11 (in the drawing). The hot boiled water at the upper part of the hot water storage tank 11 is circulated (arrow c shown in the figure) to the primary flow path 34a of the water brine heat exchanger 34.

  At this time, the three-way valve 15 is controlled to select either the outlet 11e or the outlet 11f according to the boiling temperature heated by the heat pump heat source device 20.

  According to the above control processing, even immediately after the start of heating operation when direct heating is performed, the hot water supply water can be quickly circulated to the brine heating circuit K2 side, so that the startup characteristics of the heater 31 are good. Become.

  Next, the operation during the hot water storage operation will be described. FIG. 11 is an explanatory diagram when operating the heat pump heat source device 20 to store hot hot water in the hot water storage tank 11, and at this time, as shown in FIG. 11, two first and second flow rate adjustments are performed. Each of the means 16 and 17 is switched to an opening degree at which one path and the other path communicate.

  That is, the opening degree of the first and second flow rate adjusting means 16 and 17 is switched so that the outflow side of the water heat exchanger 22 communicates with the upper part of the hot water storage tank 11. Thereby, the hot water boiled by the heat pump heat source device 20 is discharged to the upper part of the hot water storage tank 11 (arrow b shown in the figure). In addition, the heat pump heat source unit 20 at this time is boiling hot hot water.

  In this hot water storage operation, when the heating temperature of the hot water heated by the heat pump heat source device 20 is low at the start of the heating operation, the second flow rate adjusting means 17 is subjected to water heat exchange as shown in FIG. You may switch to the opening degree which the outflow side of the container 22 and the intermediate temperature taking-out path | route 14 communicate.

  Thereby, the hot water boiled by the heat pump heat source device 20 is circulated (arrow b shown in the figure) to the middle part or the lower part of the hot water storage tank 11 via the intermediate temperature extraction path 14. Accordingly, it is possible to prevent hot water having a low boiling temperature from being mixed into the hot hot water in the upper portion of the hot water storage tank 11 at the start of the heating operation in the hot water storage operation for storing hot hot water.

  Next, the operation during the freeze prevention operation will be described. As shown in FIG. 13, each of the two first and second flow rate adjusting means 16 and 17 is switched to an opening degree at which one path and the other path communicate with each other. That is, the opening degree of the first and second flow rate adjusting means 16 and 17 is switched so that the outflow side of the water heat exchanger 22 and the primary flow path 34a of the water brine heat exchanger 34 are communicated with each other.

  In this case, the hot water supply circulation pump 26 and the heat source water circulation pump 32 are operated with the heat pump heat source unit 20 stopped. As a result, the low-temperature hot water passing through the outflow side of the water heat exchanger 22 is circulated (arrow b in the figure) to the primary flow path 34a of the water brine heat exchanger 34.

  Accordingly, the low-temperature hot water passing through the outflow side of the water heat exchanger 22 flows from the hot water supply fluid heating circuit K1 side to the brine heating circuit K2 side without being mixed into the hot water stored in the hot water storage tank 11 (see FIG. It can be circulated so as to return to the lower part of the hot water storage tank 11 by the arrow b).

  Here, the hot water supply fluid heating circuit K1 side including the brine heating circuit K2 side is operated to prevent freezing. However, the present invention is not limited to this, and when the brine heating circuit K2 side is excluded, as shown in FIG. Alternatively, the second flow rate adjusting means 17 may be switched to an opening degree at which the outflow side of the water heat exchanger 22 and the intermediate temperature extraction path 14 communicate with each other to perform the freeze prevention operation on the brine heating circuit K2 side.

  According to the hot water storage type hot water supply and heating apparatus according to the first embodiment described above, the hot water supply fluid heating circuit K1 includes the hot water boiled by the heat pump heat source unit 20, the intermediate temperature hot water extracted from the intermediate temperature water extraction path 14, Alternatively, any hot hot water taken out from the upper part of the hot water storage tank 11 is circulated to the brine heating circuit K2 side.

  Thereby, the medium temperature hot water supply fluid in the hot water storage tank 11 can be positively used as a heat source for heating. Thereby, when performing the boiling operation of the heat pump heat source unit 20, the COP of the heat pump heat source unit 20 can be improved by reducing the amount of remaining hot water of the medium temperature hot water supply fluid.

  Further, the hot water heated by the heat pump heat source device 20 is configured to flow to the brine heating circuit K2 side, so that the boiling temperature of the heat pump heat source device 20 is lowered to the boiling temperature corresponding to the heater 31. be able to.

  For example, if the heater 31 is a floor heating device, the hot water supplied to the brine heating circuit K2 side may be heated to a medium temperature (for example, about 40 to 60 ° C.). Thereby, COP of the heat pump heat-source equipment 20 can be improved by lowering boiling temperature rather than hot hot water.

  In addition, when circulating hot water supply water to the brine heating circuit K2 side, for example, when the brine heating circuit K2 side starts up immediately after the start of the heating operation, the hot water supply water is used so that the startup characteristics of the heater 10 are good. It becomes.

  The hot water supply fluid heating circuit K1 is configured to distribute hot water heated by the heat pump heat source device 20 to the brine heating circuit K2 side when the hot water storage temperature in the hot water storage tank 11 is lower than a predetermined value. When the hot water temperature in the hot water storage tank 11 is equal to or higher than a predetermined value, the hot or hot hot water stored in the hot water storage tank 11 is circulated to the brine heating circuit K2 side.

  As a result, hot water can be used on the brine heating circuit K2 side based on the amount of hot water stored in the hot water storage tank 11. In particular, if there is a large amount of hot water in the hot water storage tank 11, it can be positively used on the heater 31 side.

  Moreover, if there is no room for the amount of stored hot water, the hot water heated by the heat pump heat source device 20 can be directly circulated to the brine heating circuit K2 side, so that the heating operation at the heating temperature corresponding to the heater 31 is performed. Since it can operate | move at the boiling temperature lower than the time of high temperature by performing, COP of the heat pump heat-source equipment 20 can be improved.

  The flow rate flowing through the brine heating circuit K2 is a flow rate that is controlled so that the outlet temperature of the brine flowing out from the secondary flow path 34b of the water brine heat exchanger 34 becomes the target outlet temperature. The flow rate that flows through the heating circuit K1 is a flow rate that is controlled so that the boiling temperature of the hot water flowing out of the water heat exchanger 22 becomes the target boiling temperature, and the flow rate that flows through the hot water supply fluid heating circuit K1. Is configured to store the hot water supply fluid boiled up by the heat pump heat source device 20 in the hot water storage tank 11 and flow to the hot water supply fluid heating circuit K1 when the flow rate is higher than the flow rate flowing through the brine heating circuit K2. When the flow rate is less than the flow rate flowing through the brine heating circuit K2, the hot or medium temperature hot water supply fluid stored in the hot water storage tank 11 is circulated to the brine heating circuit K2 side. It is.

  According to this, when the hot water supplied to the heating side is heated by the heat pump heat source unit 20, the flow rate on the hot water supply fluid heating circuit K1 side and the flow rate on the brine heating circuit K2 side are different. Accordingly, an excess or deficiency occurs in the flow rate on the hot water supply fluid heating circuit K1 side, but the excess or deficiency can be easily absorbed and discharged by the hot water storage tank 11. That is, excess and deficiency can be covered by the hot water storage tank 11.

  In addition, when the hot water heated by the heat pump heat source device 20 is circulated to the brine heating circuit K2 side, the hot water is heated at a lower boiling temperature than the high temperature hot water stored in the hot water storage tank 11, thereby increasing the temperature of the hot water. Since boiling temperature can be lowered | hung rather than hot water, the COP of the heat pump heat source unit 20 can be improved.

  The hot water supply fluid heating circuit K1 has a first flow rate adjustment that switches or switches the flow rate of the hot water heated by the heat pump heat source device 20 to at least one of the brine heating circuit K2 side and the upper side of the hot water storage tank 11. Means 16 and second flow rate adjusting means 17 for adjusting or switching the flow rate of flowing hot water heated by the heat pump heat source unit 20 to at least one of the upper side of the hot water storage tank 11 and the intermediate temperature extraction path 14 side are provided. Yes.

  Thereby, as at least two first and second flow rate adjusting means 16 and 17, for example, by providing a proportional valve, it is possible to easily select any one of hot water to be circulated to the brine heating circuit K2 side.

  Further, the intermediate hot water take-out path 14 is arranged to take out the medium temperature hot water supply fluid from the lower part of the hot water storage tank 11 and the intermediate part of the hot water storage tank 11 so that either the lower part or the intermediate part can be selected. When the amount of hot water stored in the hot water storage tank 11 is large, medium temperature hot water is stored in the lower part of the hot water storage tank 11, and when the amount of hot water stored in the hot water storage tank 11 is small, the intermediate portion of the hot water storage tank 11 is configured. Medium temperature hot water is stored. Therefore, it is possible to more effectively extract the medium temperature hot water from the hot water storage tank 11. Thereby, medium temperature hot water supply can be actively used for heating.

  Further, the hot water supply fluid heating circuit K1 is configured so that the low temperature hot water flowing out of the water heat exchanger 22 is circulated to the brine heating circuit K2 side during the freezing operation, whereby the hot water supply fluid heating circuit K1. By flowing to the upper part of the hot water storage tank 11 from the side and the brine heating circuit K2 side without flowing out to the intermediate hot water take-out path 14, the hot water supply is reduced without reducing the amount of hot water stored in the hot water storage tank 11. Freezing prevention operation of the fluid heating circuit K1 and the brine heating circuit K2 can be easily performed.

  Further, the hot water supply fluid heating circuit K1 circulates the hot water heated by the heat pump heat source unit 20 to the intermediate temperature water extraction path 14 side when the boiling temperature of the hot water heated by the heat pump heat source unit 20 is low. With this configuration, in the heat pump heat source device 20, the boiling temperature may be low immediately after the start of the boiling operation, but the hot water supply in the hot water storage tank 11 is distributed by flowing to the intermediate hot water extraction path 14 side. Mixing into water can be prevented.

  Further, the hot water supply fluid heating circuit K1 circulates the hot water heated by the heat pump heat source unit 20 to the intermediate temperature water extraction path 14 side when the boiling temperature of the hot water heated by the heat pump heat source unit 20 is low. The high temperature hot water supply fluid taken out from the upper part of the hot water storage tank 11 is circulated to the brine heating circuit K2 side.

  Thereby, although the boiling temperature may be low immediately after the start of the boiling operation, the rising characteristics of the heater 31 can be improved by circulating the hot water supply water to the brine heating circuit K2 side.

  In addition, the heat pump heat source unit 20 is configured by a supercritical heat pump cycle in which the refrigerant pressure on the high temperature side is equal to or higher than the critical pressure of the refrigerant, so that hot water, for example, about 90 ° C. is stored in the hot water storage tank 11. be able to.

(Second Embodiment)
In the first embodiment described above, the intermediate temperature take-out path 14 connected to the other path of the second flow rate adjusting means 17 is arranged at a substantially intermediate portion in the vertical direction of the high / intermediate temperature mixing valve 18 and the hot water storage tank 11 and below the intermediate portion. Although it is configured to branch to the intermediate temperature extraction path 14 provided between the outlets 11e and 11f formed in the lower part and connect to the second flow rate adjusting means 17, the present invention is not limited thereto, as shown in FIG. Alternatively, a separate medium temperature extraction path 14 may be provided, connected to the second flow rate adjusting means 17 at the tip thereof, and connected to the outlet port 11f provided in the substantially middle portion of the hot water storage tank 11 in the vertical direction. .

(Third embodiment)
In the above embodiment, in the hot water supply fluid heating circuit K1, between the outflow side of the water heat exchanger 22 and the discharge port 11b of the hot water storage tank 11, the outflow side of the water heat exchanger 22, the second flow rate adjusting means 17 is provided. The first flow rate adjusting means 16 and the discharge port 11b of the hot water storage tank 11 are arranged in this order. However, the present invention is not limited to this, and the outflow side of the water heat exchanger 22, the first flow rate adjusting means 16, the second flow rate. You may comprise so that it may arrange | position in order of the adjustment means 17 and the discharge outlet 11b of the hot water storage tank 11. FIG.

  More specifically, as shown in FIG. 15, the first flow rate adjusting means 16 is connected to one path on the outflow side of the water heat exchanger 22 and one of the other paths is connected to the brine heating circuit K2 side. The other of the other paths is connected to one of the other paths of the second flow rate adjusting means 17. Then, one path of the second flow rate adjusting means 17 is connected to the intermediate temperature take-out path 14 side, and the other path of the second flow rate adjusting means 17 is connected to the discharge port 11 b side of the hot water storage tank 11.

  That is, one of the second flow rate adjusting means 17 is switched so that either the hot water extracted from the intermediate temperature extraction path 14 or the hot water extracted from the upper part of the hot water storage tank 11 flows to the first flow rate adjusting means 16. . The other first flow rate adjusting means 16 distributes the hot water that has flowed out of the water heat exchanger 22 to the primary flow path 34a of the water brine heat exchanger 34, or distributes it to the second flow rate adjusting means 17 side. Can be switched to.

  Thus, these two flow rate adjusting means 16 and 17 are disposed between the outflow side of the water heat exchanger 22 and the discharge port 11b of the hot water storage tank 11, so that the outflow side of the water heat exchanger 22 and the brine The heating circuit K2, the upper part of the hot water storage tank 11, and the intermediate part of the hot water storage tank 11 can communicate with each other. Therefore, the hot water boiled by the heat pump heat source device 20 can be circulated through the primary side flow path 34 a of the water brine heat exchanger 34.

  Alternatively, the hot hot water at the upper part of the hot water storage tank 11 or the intermediate temperature hot water at the intermediate part of the hot water storage tank 11 can be circulated through the primary side flow path 34 a of the water brine heat exchanger 34.

(Fourth embodiment)
In the above embodiment, in the hot water supply fluid heating circuit K1, between the outflow side of the water heat exchanger 22 and the discharge port 11b of the hot water storage tank 11, the outflow side of the water heat exchanger 22, the second flow rate adjusting means 17 is provided. The first flow rate adjusting means 16 and the discharge port 11b of the hot water storage tank 11 are arranged in this order. However, the present invention is not limited to this, and as shown in FIG. Between the outlet side of the hot water storage tank 11 and the discharge port 11b of the hot water storage tank 11, the second flow rate adjusting means 17 is connected to the branch point A of the intermediate temperature extraction path 14 and the primary side flow path 34a of the water brine heat exchanger 34. It may be arranged between the two, and may be configured to connect one path of the second flow rate adjusting means 17 and the other path of the other flow path of the first flow rate adjusting means 16.

  FIG. 16 shows a case where the flow rate on the hot water supply fluid heating circuit K1 side is higher than the flow rate on the brine heating circuit K2 side in the heating operation by the boiling operation at an intermediate temperature (for example, about 40 to 60 ° C.). That is, it is the same as the operation mode of FIG. 5 described above. More specifically, as shown in FIG. 16, the second flow rate adjusting means 17 is switched to an intermediate opening degree where the other path communicates with each other. 1 The flow rate adjusting means 16 is switched to an opening degree at which one path and the other path communicate.

  In other words, one of the first flow rate adjusting means 16 is switched to an opening degree communicating with the outflow side of the water heat exchanger 22 and one path of the second flow rate adjusting means 17. The other second flow rate adjusting means 17 is switched to an intermediate opening degree at which the branch point A of the intermediate temperature extraction path 14 and the primary flow path 34a of the water brine heat exchanger 34 communicate with each other.

  Thereby, the hot water heated at the medium temperature (for example, about 40 to 60 ° C.) boiled by the heat pump heat source device 20 is circulated to the brine heating circuit K2 side (arrows b and c in the figure), and the second flow rate Excess hot water on the hot water supply fluid heating circuit K1 side is discharged by the adjusting means 17 into the intermediate temperature extraction path 14 (arrow d shown in the figure).

  Then, intermediate temperature hot water is stored in an intermediate portion of the hot water storage tank 11 downstream of the intermediate temperature extraction path 14). In this case, even if the flow rate on the brine heating circuit K2 side is reduced, if the outlet temperature of the brine flowing out of the secondary flow path 34b of the water brine heat exchanger 34 exceeds the target outlet temperature, the second It is preferable to control the flow rate adjusting means 17 so that the other path leading to the brine heating circuit K2 side is not the intermediate opening degree.

  By the way, in the above embodiment, when the medium temperature hot water in the hot water storage tank 11 is circulated to the brine heating circuit K2 side as a heating heat source, it is boiled by the heat pump heat source device 20 as shown in FIG. Although the hot water storage operation in which hot water is stored in the hot water storage tank cannot be performed, in the present embodiment, the heating operation using the hot water in the hot water storage tank and the hot water storage operation in which hot hot water is stored in the hot water storage tank 11 are performed. Can be done at the same time.

  More specifically, as shown in FIG. 17, the first flow rate adjusting means 16 is switched to an opening degree at which one path and either of the other paths communicate with each other, and the second flow rate adjusting means 17 is switched between the other paths. Switch to the intermediate opening for communication.

  That is, one of the first flow rate adjusting means 16 is switched so that the outflow side of the water heat exchanger 22 and the discharge part 11b of the hot water storage tank 11 communicate with each other. As a result, the hot water supply fluid heating circuit K1 and the brine heating circuit K2 are closed. That is, hot water heated by the heat pump heat source device 20 can be stored in the discharge part 11b of the hot water storage tank 11 (arrow d shown in the figure).

  Further, in this case, the hot water storage operation is controlled by performing the boiling operation at the high boiling temperature (90 ° C.) and the maximum heating capacity. Therefore, for example, when performing the heating operation, when the amount of hot water stored in the hot water storage tank 11 is less than a predetermined value, the hot water storage operation can be performed simultaneously with the heating operation.

  Further, the other second flow rate adjusting means 17 is switched to an intermediate opening degree at which the intermediate temperature extraction path 14 and the primary flow path 34a of the water brine heat exchanger 34 communicate with each other. As a result, the medium-temperature hot water stored in the intermediate portion of the hot water storage tank is circulated to the brine heating circuit K2 side (arrows a and b shown in the drawing) via the medium-temperature extraction path 14. Therefore, heating can be performed using the medium temperature hot water stored in the hot water storage tank 11.

  By the way, the hot water in the intermediate portion of the hot water storage tank to be circulated through the brine heating circuit K2 is the hot water having a temperature equal to or higher than the target outlet temperature of the brine flowing out from the water brine heat exchanger 34. Any one of the outlets 11f may be selected.

  In the present embodiment, the hot water boiled by the heat pump heat source device 20 is circulated to the brine heating circuit K2 side, or the medium temperature hot water in the hot water storage tank 11 is used as a heating heat source to the brine heating circuit K2 side. Although it distribute | circulated, not only this but the hot hot water of the hot water storage tank 11 upper part can also be distribute | circulated to the brine heating circuit K2 side as a heat source of heating.

  More specifically, as shown in FIG. 18, the first flow rate adjusting means 16 is switched to an intermediate opening degree where the other path communicates with each other, and the second flow rate adjusting means 17 is switched to one path and the other path. Switch to the degree of opening that communicates.

  That is, one of the first flow rate adjusting means 16 is switched to an intermediate opening degree at which one path of the second flow rate adjusting means 17 communicates with the upper part of the hot water storage tank 11. The other second flow rate adjusting means 17 is switched to an opening degree at which the outflow side of the water heat exchanger 22 and the primary flow path 34a of the water brine heat exchanger 34 are communicated with each other.

  As a result, the intermediate temperature extraction path 14 side and the brine heating circuit K2 side are closed by the second flow rate adjusting means 17. The upper part of the hot water storage tank 11 and the primary flow path 34a of the water brine heat exchanger 34 are communicated with each other by the first and second flow rate adjusting means 16 and 17 (arrows a, b and c shown in the figure). Therefore, the hot hot water at the upper part of the hot water storage tank 11 can be distributed to the brine heating circuit K2 side as a heating heat source.

  Next, when the boiling temperature of the hot water heated by the heat pump heat source device 20 at the start of the heating operation is low, the outflow side of the water heat exchanger 22 and the branch point A of the intermediate temperature extraction path 14 communicate with each other. The first flow rate adjusting means 16 and the second flow rate adjusting means 17 may be switched.

  Specifically, as shown in FIG. 19, the first flow rate adjusting means 16 is switched to flow through one path of the second flow rate adjusting means 17, and the second flow rate adjusting means 17 is switched between the one path and the intermediate temperature extraction path. The 14 switching points A are switched so as to communicate with each other.

  Thereby, the hot water boiled by the heat pump heat source device 20 is circulated through the intermediate part of the hot water storage tank 11 (arrows b and c shown in the figure). Therefore, when the boiling temperature is lower than the target boiling temperature, it is returned to the intermediate portion of the hot water storage tank 11. At this time, it is possible to prevent hot water having a low boiling temperature from being mixed into hot hot water in the upper part of the hot water storage tank 11.

(Other embodiments)
In the above embodiment, the flow rate adjusting means 16 and 17 are proportional valves that change the communication ratio between one path and the other path. However, the present invention is not limited to this, and the hot water supply fluid heating circuit K1 and brine heating are used. A switching valve that can switch communication between the circuit K2, the upper part of the hot water storage tank 11, and the intermediate part of the hot water storage tank 11 may be used.

  In the above embodiment, the heat pump heat source unit 20 is configured from a supercritical heat pump cycle in which the refrigerant pressure on the high temperature side is equal to or higher than the critical pressure of the refrigerant. A heat pump cycle may be used. Further, although the expansion valve 23 is used as a pressure reducer, a heat pump cycle using other pressure reducers including an ejector may be used.

  Moreover, in the above embodiment, as the heating unit 30, one floor heating apparatus is configured and applied as the heater 31. However, the configuration is not limited thereto, and the configuration of the type and quantity of the heater 31 to be connected is different. It may be a thing. Moreover, you may comprise the control apparatus 40 so that the tank unit 10, the heat pump heat source machine 20, and the heating unit 30 may be controlled separately.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply and heating apparatus in 1st Embodiment of this invention, and is explanatory drawing which shows the flow direction of the hot water supply when the heating side flow rate in a high temperature boiling operation is larger than a heating required flow rate. is there. It is a flowchart which shows the control processing of the heating operation by the control apparatus 40 in 1st Embodiment of this invention. It is explanatory drawing which shows the flow direction of the hot water supply when the heating side flow volume in a high temperature boiling operation is smaller than a heating required flow volume. It is explanatory drawing which shows the flow direction of the hot water supply when the heating side flow volume and heating required flow volume in high temperature boiling operation are equal. It is explanatory drawing which shows the flow direction of the hot water supply when the heating side flow volume in a medium temperature boiling operation is larger than a heating required flow volume. It is explanatory drawing which shows the flow direction of the hot water supply when a heating side flow volume in a medium temperature boiling operation is smaller than a heating required flow volume. It is explanatory drawing which shows the flow direction of the hot water supply when the heating side flow volume and heating required flow volume in medium temperature boiling operation are equal. It is explanatory drawing which shows the flow direction of the hot water supply when the hot hot water supply in a hot water storage tank is used. It is explanatory drawing which shows the flow direction of hot water when using the middle temperature hot water in a hot water storage tank. It is explanatory drawing which shows the flow direction of hot water supply when the boiling temperature at the time of a direct heating operation start is low. It is explanatory drawing which shows the flow direction of the hot water supply when hot hot water is stored in the hot water storage tank. It is explanatory drawing which shows the flow direction of the hot water supply when the boiling temperature at the time of the start of hot water storage operation is low. It is explanatory drawing which shows the flow direction of the hot water at the time of a freezing prevention driving | operation. It is a schematic diagram which shows the whole structure of the hot water storage type hot-water supply and heating apparatus in 2nd Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply and heating apparatus in 3rd Embodiment of this invention. It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply and heating apparatus in 4th Embodiment of this invention, and is explanatory drawing which shows the flow direction of the hot water supply when the heating side flow rate in a medium temperature boiling operation is larger than a heating required flow rate. is there. It is explanatory drawing which shows the flow direction of the hot water when the hot water storage operation in the high temperature hot water storage operation and hot water storage tank in 4th Embodiment of this invention is used. It is explanatory drawing which shows the flow direction of hot water when the hot hot water in the hot water storage tank in 4th Embodiment of this invention is used. It is explanatory drawing which shows the flow direction of the hot water supply when the boiling temperature at the time of the direct heating operation start in 4th Embodiment of this invention is low. It is a schematic diagram which shows the whole structure of the hot water storage type hot-water supply and heating apparatus in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Hot water storage tank 14 ... Medium temperature taking-out path 16 ... 1st flow volume adjustment means 17 ... 2nd flow volume adjustment means 20 ... Heat pump heat source machine 21 ... Compressor 22 ... Water heat exchanger (radiator)
DESCRIPTION OF SYMBOLS 31 ... Heater 34 ... Water brine heat exchanger 34a ... Primary side flow path 34b ... Secondary side flow path Bj ... Brine circulation circuit K1 ... Fluid heating circuit for hot water supply K2 ... Brine heating circuit

Claims (4)

A hot water storage tank (11) for storing hot water supply fluid;
A heat pump heat source device (20) having a compressor (21) and a radiator (22), and performing a boiling operation by passing a low-temperature hot water supply fluid from the hot water storage tank (11) to the radiator (22). )When,
The low temperature hot water supply fluid taken out from the lower part of the hot water storage tank (11) is boiled by the heat pump heat source device (20), and the hot water supply fluid is returned to the upper part of the hot water storage tank (11). A heating circuit (K1);
A water brine heat exchanger (34) having a primary flow path (34a) through which the hot water supply fluid passes and a secondary flow path (34b) through which the brine passes, and for heating the brine with the hot water supply fluid;
A brine heating circuit (K2) for returning the hot water supply fluid taken out from the hot water storage tank (11) to the lower part of the hot water storage tank (11) after passing through the water brine heat exchanger (34);
In the hot water storage type hot water supply and heating device comprising a heater (31) that dissipates the brine heated in the water brine heat exchanger (34) for heating purposes,
An intermediate temperature water extraction path (14) for extracting an intermediate temperature hot water supply fluid from the hot water storage tank (11) is provided,
The hot water supply fluid heating circuit (K1) and the brine heating circuit (K2) are a hot water heated by the heat pump heat source unit (20) and an intermediate temperature hot water supply taken out from the intermediate temperature water extraction path (14). Either a hot fluid or a hot hot water supply fluid taken out from the upper part of the hot water storage tank (11) is circulated to the brine heating circuit (K2) side, and the intermediate hot water take-out route (14) is used. When the medium-temperature hot water supply fluid taken out is circulating to the brine heating circuit (K2) side, the high-temperature hot water supply fluid boiled by the heat pump heat source unit (20) is supplied to the hot water storage tank (11). Configured to return to the top,
In the hot water supply fluid heating circuit (K1) and the brine heating circuit (K2), the hot water supply fluid boiled by the heat pump heat source device (20) is supplied to the intermediate hot water take-out path (14) side and the hot water storage tank ( 11) the first flow rate adjusting means (16) for switching the flow path so as to circulate to at least one of the upper side, and the hot-water supply fluid boiled by the heat pump heat source unit (20) to the water brine heat exchanger ( 34) and a second flow rate adjusting means (17) for switching the flow path so as to flow to at least one of the intermediate temperature extraction path (14) side, and
The first flow rate adjusting means (16) is arranged upstream of the second flow rate adjusting means (17) with respect to the flow of the hot water supply fluid boiled up by the heat pump heat source unit (20),
The second flow rate adjusting means (17) is arranged in the middle of the path from the first flow rate adjusting means (16) to the intermediate hot water extraction path (14),
The first flow rate adjusting means (16) and the second flow rate adjusting means (17) close the intermediate warm water take-out path and take out the medium temperature hot water supply fluid from the hot water storage tank (11). Switching the flow path so that the hot water supply fluid boiled by the machine (20) and the hot water supply fluid taken out from the upper part of the hot water storage tank (11) are circulated to the brine heating circuit (K2). A hot water storage / heating system featuring hot water storage. The intermediate-temperature water take-out path (14) is arranged so as to take out a medium-temperature hot water supply fluid from a lower part of the hot water storage tank (11) and an intermediate part of the hot water storage tank (11). The hot water storage hot-water supply / heating device according to claim 1 , wherein either one of the two can be selected. The hot water supply fluid heating circuit (K1) is configured to distribute the hot water supply fluid that has flowed out of the radiator (22) to the brine heating circuit (K2) side during a freezing operation. The hot-water storage type hot-water supply / heating device according to claim 1 or 2 . The said heat pump heat-source machine (20) is comprised from the supercritical heat pump cycle from which the refrigerant | coolant pressure of a high temperature side becomes more than the critical pressure of a refrigerant | coolant, The Claim 1 thru | or 3 characterized by the above-mentioned. Hot water storage and heating system.

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