JP2008032291A - Heat pump type hot water supply heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve both of COP in a direct heating operation and COP in a high-temperature hot water storage operation, in a heat pump type hot water supply heating device. <P>SOLUTION: Intermediate-temperature direct heating is executed when a H/P water supply temperature T1 is lower than a reference water supply temperature, and high-temperature direct heating is executed when the H/P water supply temperature T1 is higher than the reference water supply temperature in the direct heating operation. When the H/P water supply temperature T1 is low, COP can be increased by lowering a boiling-up temperature. When the H/P water supply temperature T1 is high, the boiling-up temperature is increased as the COP difference with respect to high and low boiling-up temperatures is small when the H/P water supply temperature T1 is high. Thus the hot water is stored in a hot water storage tank 5 in the direct heating operation, and a ratio of the water of intermediate temperature is decreased. As the ratio of the water of intermediate temperature in the hot water storage tank 5 is decreased, COP can be increased in performing the high temperature hot water storage operation. Further as the ratio of hot water in the hot water storage tank 5 is increased, power consumption in the high temperature hot water storage operation can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention heats hot water in a hot water storage tank by a heat pump cycle, and performs heat operation using the heat of hot water heated by the heat pump cycle or the hot water stored in the hot water tank. It relates to a heating device.

2. Description of the Related Art A heat pump hot water supply / room heating apparatus that performs a heating operation using the heat of hot water heated by a heat pump cycle or the heat of hot water stored in a hot water storage tank is known (see, for example, Patent Document 1).
The heating operation by the heat pump hot water supply / heating device includes (1) “direct heating operation” in which heating brine is directly heated by hot water heated in a heat pump cycle, and (2) hot water stored in a hot water storage tank. There is a “heat storage operation” in which brine for heating is heated with water. It has been proposed to switch between the direct warming operation and the heat accumulating operation according to the operating conditions of the heat pump hot water supply / room heating device.

  Here, during the direct warming operation, the heating device side requests a large amount of brine heating (for example, when the heating operation is started) and does not require a large amount of brine heating (for example, during steady operation). is there. Therefore, when the heating device side requires a large amount of heating of the brine, the boiling temperature of the hot water heated in the heat pump cycle is increased (for example, 90 ° C.) to increase the heating amount of the brine, and the heating device side is In the case where a large amount of heating is not required, proposals have been made to increase the COP (coefficient of performance) of the heat pump cycle by lowering the boiling temperature of hot water heated in the heat pump cycle (for example, 65 ° C.).

In addition, during the direct warming operation, not all of the hot water heated in the heat pump cycle (boiling hot water) is led to the water / brine heat exchanger for heating the heating brine, The excess hot water supplied is returned to the hot water storage tank, and the hot water storage tank is used as a buffer.
For this reason, the medium temperature hot water heated in the heat pump cycle is lower in the hot water storage tank as the operation state (such as steady operation) in which the heating device does not require a large amount of brine heating during the direct warm operation continues. A lot of (medium temperature water: for example, 65 ° C.) is stored.

On the other hand, the heat pump hot water heater / heater performs a high temperature hot water storage operation in which hot water in a hot water storage tank is boiled to high temperature hot water (hot water: for example, 90 ° C.) in a time zone where electricity charges are low such as midnight. In this high temperature hot water storage operation, the operation of boiling the medium temperature water into hot water results in a low COP of the heat pump cycle.
However, as described above, during the direct warming operation, the heating device side is continuously operated in a state where it does not require a large amount of brine heating (steady operation or the like), so that the inside of the hot water storage tank is heated at a low temperature by a heat pump cycle. Since a large amount of medium-temperature water is stored, there is a problem that the COP is lowered when a high-temperature hot water storage operation is performed at midnight or the like.
JP 2004-286292 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat pump hot water supply / room heating device capable of increasing both COP during direct warming operation and COP during high temperature hot water storage operation. .

[Means of claim 1]
The control device (4) of the heat pump hot water supply / room heating device adopting the means of claim 1 raises the hot water supply by the heat pump cycle (R) when the H / P feed water temperature (T1) is low during the direct warming operation. The temperature is controlled to the low temperature side, and when the H / P feed water temperature (T1) is high, the boiling temperature of the hot water by the heat pump cycle (R) is controlled to the high temperature side.
When the H / P feed water temperature (T1) is low, the COP of the heat pump cycle (R) can be increased by lowering the boiling temperature than by raising the boiling temperature. it can.

On the other hand, when the H / P feed water temperature (T1) is high, the difference in the COP of the heat pump cycle (R) is small even if the boiling temperature is raised or lowered. Therefore, when the H / P feed water temperature (T1) is high, the boiling water temperature is raised, so that the excess hot water supplied to the hot water storage tank (5) during the direct warming operation can be used as hot water. As a result, hot water is stored in the hot water storage tank (5) during the direct warming operation, and it is possible to prevent intermediate hot water from being stored in the hot water storage tank (5) during the direct warming operation. That is, the ratio of the medium temperature water in the hot water storage tank (5) is suppressed, and conversely, the ratio of hot water in the hot water storage tank (5) increases.
Thus, since the ratio of the medium temperature water in the hot water storage tank (5) is suppressed, when performing the high temperature hot water storage operation at midnight or the like, it is possible to reduce the operation for boiling the medium temperature water into hot water (operation with a low COP). . That is, COP at the time of high temperature hot water storage operation can be increased.
In addition, since the ratio of hot water in the hot water storage tank (5) increases, the operation time of the high temperature hot water storage operation in which the hot water storage tank (5) is heated to hot water at midnight can be shortened, which is necessary for the high temperature hot water storage operation. Power consumption can be reduced.

[Means of claim 2]
The control device (4) of the heat pump type hot water supply and heating device adopting the means of claim 2 is configured to control the heating temperature of the hot water supply by the heat pump cycle (R) to the low temperature side during the direct warming operation. When the hot water heated in step S is returned to the intermediate portion in the vertical direction of the hot water storage tank (5) and the boiling temperature of the hot water in the heat pump cycle (R) is controlled to the high temperature side during direct warming operation, The surplus portion of the hot water heated in the cycle (R) is returned to the upper part of the hot water storage tank (5) in the vertical direction.
That is, during the direct warming operation, hot water is returned to the upper part of the hot water storage tank (5), and intermediate hot water is returned to the intermediate part of the hot water storage tank (5).
Thereby, the malfunction which hot water and medium temperature water mix in the hot water storage tank (5) does not arise.

[Means of claim 3]
The control device (4) of the heat pump hot water supply / room heating device adopting the means of claim 3 is stored in the intermediate portion in the vertical direction of the hot water storage tank (5) when a predetermined operation condition is established during the heating operation. The hot water is led to the water / brine heat exchanger (34) to perform the heating operation.
Thereby, the middle temperature water stored in the hot water storage tank (5) can be consumed during the heating operation, and as a result, the temperature of hot water other than hot water in the hot water storage tank (5) can be lowered. Thus, since the hot water supply temperature other than hot water in the hot water storage tank (5) can be lowered, the COP at the time of performing the high temperature hot water storage operation at midnight or the like can be increased.

[Means of claim 4]
The control device (4) of the heat pump type hot water supply and heating device adopting the means of claim 4 is provided with a hot water storage tank (5) when the hot water storage temperature in the vertical middle portion of the hot water storage tank (5) is higher than a predetermined temperature during the heating operation. The medium temperature water stored in the intermediate portion in the vertical direction in (1) is guided to the water / brine heat exchanger (34) to perform the heating operation.

The heat pump hot water supply and heating apparatus of the best mode 1 includes a hot water storage tank (5) for storing heated hot water supply, a heat pump cycle (R) including a radiator (22) for radiating refrigerant, and a radiator (22 The refrigerant / water heat exchanger (26) that heats the hot water in the hot water storage tank (5) by the heat release of the refrigerant in the heat source), the heat of the hot water stored in the hot water storage tank (5), or the heat pump cycle (R) A water / brine heat exchanger (34) that heats the brine for heating by the heat of the hot water heated by, and a control device (4) that controls the temperature of the hot water heated by the heat pump cycle (R), It comprises.
This heat pump type hot water supply and heating device employs a structure that returns an excess amount of hot water heated in the heat pump cycle (R) to the hot water storage tank (5) during direct heating operation.

When the H / P feed water temperature (T1) is lower than a preset reference feed water temperature during the direct warming operation, the control device (4) controls the boiling temperature of the hot water supply by the heat pump cycle (R) to the low temperature side. When the H / P feed water temperature (T1) is higher than a preset reference feed water temperature, the “boiling temperature switching means (control program)” controls the hot water boiling temperature by the heat pump cycle (R) to the high temperature side. Is provided.
By executing this boiling temperature switching means, when the H / P feed water temperature (T1) is low, the boiling temperature is low and the COP can be increased.
In addition, when the H / P feed water temperature (T1) is high, the boiling temperature is high, the ratio of the medium temperature water in the hot water storage tank (5) is suppressed, and the operation with low COP is reduced when performing the high temperature hot water storage operation. it can. That is, COP at the time of high temperature hot water storage operation can be increased.
Furthermore, when the H / P feed water temperature (T1) is high, the boiling temperature is high and the proportion of hot water in the hot water storage tank (5) increases, so the operation time of the high temperature hot water storage operation can be shortened and the power consumption can be reduced. Can do.

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

A first embodiment in which the present invention is applied to a heat pump hot water supply / room heating apparatus will be described with reference to FIGS.
The heat pump type hot water supply and heating device includes a tank device 1, a heat pump heat source device 2, and a hot water type heating device 3, and the operation is controlled by the control device 4.
Hereinafter, water stored in the hot water storage tank 5 is referred to as “hot water”, and high-temperature water (for example, water at 75 to 90 ° C.) stored in the upper portion of the hot water storage tank 5 is referred to as “hot water”. The hot water stored in the middle of the hot water storage tank 5 and having a temperature lower than that of hot water (for example, water at 40 to 75 ° C.) is referred to as “medium hot water”. The water stored in the lower part of the hot water storage tank 5 and having a temperature lower than the medium temperature water (for example, water below 40 ° C.) or directly supplied from the water supply will be referred to as “cold water”.

(Description of tank device 1)
The tank device 1 is equipped with a hot water storage tank 5 that stores hot water. The hot water storage tank 5 is a heat insulating container having a predetermined capacity capable of storing hot water in a state where it is kept warm for a long time, and is made of a material (for example, stainless steel) having excellent corrosion resistance.
A water supply pipe 6 connected to the water supply is connected to the lower part of the hot water storage tank 5. The water supply pipe 6 is provided with a check valve (not shown) and an electric open / close valve (for example, a normally open valve), which are connected to the water supply and are opened from the water supply in a state where the electric open / close valve is opened. The supplied tap water is supplied to the lower part of the hot water storage tank 5 by the tap pressure.

A hot water supply pipe 7 for supplying hot water stored in the upper part of the hot water storage tank 5 to the outside is connected to the upper part of the hot water storage tank 5.
An intermediate portion of the hot water storage tank 5 is connected to an intermediate hot water pipe 8 for supplying hot water of the intermediate temperature stored in the intermediate portion of the hot water storage tank 5 to the outside. The downstream end of the intermediate hot water pipe 8 is connected to a first electric three-way valve 11 (hot water / medium hot water switching three-way valve) provided in the middle of the hot water supply pipe 7 to switch the first electric three-way valve 11. Therefore, hot water or medium-temperature water is provided so that it can be discharged.

  The hot water supply pipe 7 on the downstream side of the first electric three-way valve 11 is provided with a second electric three-way valve 12 (hot water / cold water switching three-way valve). A bypass water supply pipe 13 branched from the water supply pipe 6 is connected to one side of the second electric three-way valve 12, and hot water (hot water or hot water) in the hot water storage tank 5 is switched by switching the second electric three-way valve 12. Middle temperature water) or cold water (tap water) can be discharged.

(Description of hot water heating circuit K0 and heating primary circuit K1)
The hot water storage tank 5 is provided with a hot water heating circuit K0 for heating hot water stored inside, and a heating primary for heating a heating brine by hot water stored inside, separately from the above-mentioned pipes. The circuit K1 is connected. First, basic configurations of the hot water supply heating circuit K0 and the heating primary circuit K1 will be described.

  The hot water supply heating circuit K 0 is a reflux circuit that heats hot water in the lower part of the hot water storage tank 5 by the heat pump heat source device 2 and returns it to the upper part of the hot water storage tank 5. The hot water heating circuit K0 is provided with a water-side heat exchanger 14 and passes through the water-side heat exchanger 14 by exchanging heat with a refrigerant passing through a radiator 22 of a heat pump cycle R described later. Hot water is heated. A hot water storage pump P0 is provided on the upstream side of the water side heat exchanger 14, and when an operation instruction is given from the control device 4, the lower part of the hot water tank 5 → the water side heat exchanger 14 → the upper part of the hot water tank 5. A water stream that leads to

  The heating primary circuit K1 stores hot water in the upper part of the hot water storage tank 5 via a heating water side heat exchanger 16 (which forms a water / brine heat exchanger 34 together with a heating brine side heat exchanger 31 described later). A reflux circuit for returning to the lower part of the tank 5. A heating primary pump P1 is provided in the middle of the heating primary circuit K1. This heating primary pump P <b> 1 is an electric pump and generates a water flow from the upper part of the hot water storage tank 5 to the lower part of the hot water storage heat exchanger 16 → the lower part of the hot water storage tank 5 when an operation instruction is given from the control device 4.

  Moreover, the hot water supply heating circuit K0 and the heating primary circuit K1 of this embodiment include (1) hot water heated by the water-side heat exchanger 14 when the heat pump heat source device 2 is operated, In addition to the upper part of the hot water storage tank 5, it is provided so that it can be returned to the intermediate part of the hot water storage tank 5. (2) The heating water side heat exchanger 16 can be supplied to the heating water side heat exchanger 16, and (3) the intermediate warm water stored in the intermediate portion of the hot water storage tank 5 can be supplied to the heating water side heat exchanger 16.

Specifically, the hot water supply heating circuit K0 and the heating primary circuit K1 of this embodiment employ a water circuit using the third and fourth electric three-way valves 18, 19,
(1) “High temperature hot water storage operation {see FIG. 2 (a)}” for supplying “hot water” heated by the water-side heat exchanger 14 to the upper part of the hot water storage tank 5.
(2) “Hot water” in the upper part of the hot water storage tank 5 to the heating water side heat exchanger 16 “floor heating operation using high temperature heat storage (high temperature heat storage) {see FIG. 2 (b)}”
(3) “Medium temperature water” in the middle of the hot water storage tank 5 is led to the heating water-side heat exchanger 16 “floor heating operation using intermediate temperature heat storage (medium temperature storage) {see FIG. 2 (c)}”
(4) “High-temperature direct heating operation (high-temperature direct heating: at this time, the water-side heat exchanger 14 is used to guide the“ hot water ”heated by the water-side heat exchanger 14” directly to the water-side heat exchanger 16 for heating. The surplus of heated hot water is returned to the upper part of the hot water storage tank 5) {see FIG. 2 (d)},
(5) "Medium temperature water" heated by the water side heat exchanger 14 is directly guided to the heating water side heat exchanger 16 "Medium temperature direct heating operation (Medium temperature direct warming: At this time, the water side heat exchanger 14 The surplus of the heated medium-temperature water is returned to the intermediate part of the hot water storage tank 5) {see FIG. 2 (e)}, etc., and various operations are possible depending on the operation state.
Due to the above (4) and (5), there is no problem that hot water and medium temperature water are mixed in the hot water storage tank 5.
It should be noted that the water circuit configurations of the hot water supply heating circuit K0 and the heating primary circuit K1 can be variously changed according to functions and the like.

(Description of heat pump heat source device 2)
The heat pump heat source device 2 is a heat source unit that heats the hot water in the hot water storage tank 5 using the hot water heating circuit K0 described above. The hot water supplied to the water-side heat exchanger 14 by the hot water heating circuit K0 A heat pump cycle R for heating is mounted.
The heat pump cycle R employs a supercritical heat pump cycle that heats hot water in the hot water storage tank 5 to hot water (eg, 90 ° C.). Here, the 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 the refrigerant.

The heat pump cycle R of this embodiment forms a closed circuit for circulating the refrigerant in the order of the refrigerant compressor 21 → the radiator 22 → the expansion device 23 → the refrigerant evaporator 24 → the accumulator 25 → the refrigerant compressor 21 again.
The refrigerant compressor 21 performs suction, compression, and discharge of refrigerant (carbon dioxide in this embodiment), and the refrigerant compressor 21 is driven by an electric motor (not shown). The refrigerant compressor 21 may be integrated with the electric motor, or may be separate from the electric motor.

  The radiator 22 is combined with the water-side heat exchanger 14 to form a refrigerant / water heat exchanger 26. The inside of the water-side heat exchanger 14 is circulated by the high-temperature and high-pressure refrigerant supplied to the radiator 22. Heat the passing hot water. Specifically, the refrigerant / water heat exchanger 26 is provided so that the flow direction of the refrigerant flowing through the radiator 22 and the flow direction of hot water flowing through the water-side heat exchanger 14 face each other.

The expansion device 23 is a pressure reducer that adiabatically expands the refrigerant that has passed through the radiator 22, and employs an electric expansion valve that can vary the amount of pressure reduction by an electric actuator.
The refrigerant evaporator 24 exchanges heat between the refrigerant that has passed through the expansion device 23 and has been decompressed, and the atmosphere, and increases the thermal energy of the refrigerant. The refrigerant evaporator 24 is provided with an electric fan 27 that promotes heat exchange between the refrigerant and the atmosphere.
The accumulator 25 is a gas-liquid separator that stores surplus refrigerant in the heat pump cycle R and guides only the gas refrigerant to the refrigerant compressor 21.

(Description of the hot water heater 3)
The hot water heating device 3 heats the heating brine using the heating primary circuit K1, and performs floor heating using the heated brine, and the brine receives the heat of the hot water supply water. Brine side heat exchanger 31, floor heating panel 32 that radiates the heat of the brine heated by heating brine side heat exchanger 31, and the floor heated panel that heats the brine heated by heating brine side heat exchanger 31 A heating secondary circuit K2 that returns to the heating brine side heat exchanger 31 again through 32 and a heating secondary pump P2 that circulates and drives the brine in the heating secondary circuit K2 are provided.

  The heating brine side heat exchanger 31 is provided integrally with the heating water side heat exchanger 16, hot water passing through the heating water side heat exchanger 16, and brine passing through the heating brine side heat exchanger 31. And heat exchange. That is, the heating brine side heat exchanger 31 is combined with the heating water side heat exchanger 16 to constitute a water / brine heat exchanger 34. Specifically, in the water / brine heat exchanger 34, the flow direction of hot water flowing in the heating water side heat exchanger 16 and the flow direction of the brine flowing in the heating brine side heat exchanger 31 are opposed to each other. Is provided.

The floor heating panel 32 is installed on the floor surface, and heats the floor surface by flowing heated brine to perform floor heating.
The heating secondary circuit K2 guides the brine heated by the water / brine heat exchanger 34 to the floor heating panel 32, and again discharges the brine that has passed through the floor heating panel 32 to the water / brine heat exchanger 34. It is a circulating circuit to return.
The secondary pump P2 for heating is an electric pump. When an operation instruction is given from the control device 4, the brine is circulated in the order of the water / brine heat exchanger 34 → the floor heating panel 32 → the water / brine heat exchanger 34 again. Let

(Description of the control device 4)
The control device 4 includes a CPU for performing control processing and arithmetic processing, a memory for storing various programs and data (ROM, standby RAM, EEPROM, RAM, etc.), an input circuit, an output circuit, a power supply circuit, and the like. Computer.
The control device 4 performs various arithmetic processes based on the read signals of the sensors (operation instruction signal, temperature setting signal, operation state of the heat pump type hot water supply and heating device, etc.), and is mounted on the heat pump type hot water supply and heating device. Energization control of various electric functional parts (each pump, each electric valve, the electric motor of the refrigerant compressor 21, the electric fan 27, etc.) is performed.

  The sensors connected to the control device 4 include an operation panel (including a main switch, an operation instruction switch for floor heating, a temperature setting device for floor heating, etc .: not shown) of the heat pump hot water heater / heater, and a hot water storage tank 5 A plurality of hot water storage thermistors 41 to 46 that detect the temperature distribution in the vertical direction of the inside, H / P that detects the temperature of hot water supplied from the hot water storage tank 5 to the refrigerant / water heat exchanger 26 (H / P water supply temperature T1) A feed water temperature sensor 47, a boiling temperature sensor 48 for detecting the temperature of the hot water heated by the refrigerant / water heat exchanger 26 (boiling temperature T2), and the temperature of the brine that has passed through the heating brine side heat exchanger 31 ( A forward temperature sensor 49 for detecting the forward temperature), a return temperature sensor 50 for detecting the temperature (return temperature) of the brine that has passed through the floor heating panel 32, an outside air temperature sensor (not shown), and the like.

(Control example of heating primary pump P1)
The rotation speed of the primary pump P1 for heating is variably controlled according to the energization amount of the built-in electric motor. The control device 4 variably controls the rotation speed of the heating primary pump P1 during the heating operation.
During the heating operation, the control device 4 feedback-controls the rotation speed of the heating primary pump P1 so that the forward temperature detected by the forward temperature sensor 49 becomes the preset target forward temperature.

(Control example of secondary pump P2 for heating)
The rotation speed of the secondary pump P2 for heating is provided so as to be variably controllable according to the energization amount of the built-in electric motor. The rotation speed of the heating secondary pump P2 is set to a predetermined initial rotation speed (steady rotation speed) at the time of construction.

(Explanation of boiling water boiling temperature control by heat pump cycle R)
The heat pump hot water supply / room heating device includes “boiling temperature variable means” for changing the boiling temperature of hot water supplied by the heat pump cycle R.
The boiling temperature varying means in this embodiment switches the temperature of the hot water passing through the refrigerant / water heat exchanger 26 to one of hot water and medium temperature water.
Specifically, in this embodiment, the temperature of hot water passing through the refrigerant / water heat exchanger 26 is switched to hot water or medium temperature water by changing the rotation speed of the hot water storage pump P0.

More specifically, the rotational speed of the hot water storage pump P0 is variably controlled according to the energization amount of the built-in electric motor. The control device 4 variably controls the rotation speed of the hot water storage pump P0 during the operation of the heat pump cycle R.
The control device 4 includes “boiling temperature determining means” that determines the boiling temperature of hot water supplied by the heat pump cycle R as either hot water or medium temperature water according to the operating state. When the boiling of water is determined, the rotational speed of the hot water storage pump P0 is feedback controlled so that the boiling temperature T2 detected by the boiling temperature sensor 48 becomes hot water (for example, 90 ° C.). When the controller 4 determines to boil up the medium-temperature water, the hot water storage pump P0 is rotated so that the boiling temperature T2 detected by the boiling temperature sensor 48 becomes a medium temperature (for example, 65 ° C.). Feedback control the number.

(Operation function of heat pump type hot water heater / heater)
In addition to the pump control described above, the control device 4 includes (1) a “heating operation control function (control program)” that operates the primary circuit K1 for heating and the secondary circuit K2 for heating to perform floor heating. (2) “Hot water storage operation control function (control program)” for operating hot water supply heating circuit K0 and heat pump heat source device 2 to store hot hot water in hot water storage tank 5, and (3) When outside air temperature is low Further, a “freezing prevention control function (control program)” for preventing freezing of the hot water heating circuit K0 and the heating primary circuit K1 in which hot water is stagnant is mounted.

(Explanation of heating operation control function)
Next, a control example of the heating operation control function will be described with reference to the flowchart of FIG.
When the control routine is entered (start), it is first determined whether or not a heating operation switch (not shown) is turned on (step S1). If this determination is NO (OFF), the process returns to step S1 and waits.
If the determination result in step S1 is YES (ON), whether or not the temperature of the hot water near the intermediate portion of the hot water storage tank 5 detected by the hot water storage thermistors 41 to 46 is lower than a predetermined temperature (for example, 40 ° C.). A determination is made (step S2).

  If the determination result in step S2 is NO (the temperature in the vicinity of the intermediate portion is 40 ° C. or higher), it is determined whether or not it is the initial operation start (heating start-up) of the heating operation (step S3). Specifically, in step S3, if the brine temperature detected by the forward temperature sensor 49 is lower than a predetermined temperature (for example, 35 ° C.), or if the temperature change of the brine detected by the forward temperature sensor 49 is in a transient state. If the temperature of the brine detected by the going-out temperature sensor 49 is equal to or higher than the predetermined temperature, or if the temperature change is in a stable state, it is not the initial stage of the heating operation. to decide.

When the determination result in step S3 is YES (initial operation start), a “floor heating operation using high-temperature heat storage” is performed to guide the hot water in the upper part of the hot water storage tank 5 to the heating water-side heat exchanger 16 (step S4). Then, the process returns to step S2.
On the other hand, if the determination result in step S3 is NO (not the initial stage of operation start), “floor heating operation using intermediate temperature heat storage” is performed to guide the intermediate temperature water of the hot water storage tank 5 to the heating water side heat exchanger 16. (Step S5), and then returns to Step S2. In addition, control of step S2 and step S5 is corresponded to the control function by an intermediate temperature storage execution means.

If the determination result in step S2 is YES (the temperature in the vicinity of the intermediate portion is less than 40 ° C.), it is determined whether or not it is the start of heating operation (heating start-up) by the same means as in step S3. (Step S6).
If the determination result in step S6 is YES (initial operation start), the heat pump heat source device 2 is operated to direct the hot water heated by the water-side heat exchanger 14 directly to the heating water-side heat exchanger 16. "High temperature direct heating operation (high temperature direct warm)" is performed (step S7), and then the process returns to step S2.

Next, the case where the determination result in step S6 is NO (during steady operation) will be specifically described.
If the determination result in step S6 is NO (during steady operation), the temperature is directly warmed {see FIG. 2 (d)} and the medium temperature according to the H / P feed water temperature T1 detected by the H / P feed water temperature sensor 47 Switching between direct warming {see FIG. 2 (e)} (step S8: function of boiling temperature switching means).
Specifically, when the H / P feed water temperature T1 detected by the H / P feed water temperature sensor 47 is equal to or lower than a preset reference feed water temperature (for example, 30 ° C.), the boiling temperature of the hot water by the heat pump cycle R is set. Medium temperature direct warming {refer to FIG. 2 (e)} controlled to the low temperature side (that is, medium temperature boiling) is executed, and the H / P feed water temperature T1 detected by the H / P feed water temperature sensor 47 is set in advance as a reference feed water When the temperature is higher than the temperature (for example, 30 ° C.), high temperature direct warming {see FIG. 2 (d)} is performed in which the boiling temperature of the hot water supply by the heat pump cycle R is controlled to the high temperature side (that is, high temperature boiling).

An example of the control in step S8 is shown in the flowchart of FIG.
When the control routine is entered, it is first determined whether or not the H / P feed water temperature T1 is equal to or lower than a reference feed water temperature (for example, 30 ° C.) (step S11).
If the determination result in step S11 is YES (H / P feed water temperature T1 is low), medium temperature direct warming {see FIG. 2 (e)} is executed (step S12), and the process returns to step S2.
If the determination result in step S11 is NO (H / P feed water temperature T1 is high), high temperature direct warming {see FIG. 2 (d)} is executed (step S13), and the process returns to step S2.

(Effect 1 of Example 1)
Here, the COP of the heat pump cycle R at the time of high temperature boiling and at the time of medium temperature boiling will be described with reference to FIG. In FIG. 5, the change in high temperature boiling COP with respect to the change in the H / P feed water temperature T1 is shown by a solid line A, and the change in medium temperature boiling COP with respect to the change in the H / P feed water temperature T1 is shown in a broken line B.
As can be seen from FIG. 5, the lower the H / P feed water temperature T1, the higher the COP of the medium temperature boiling than the high temperature boiling, but conversely the COP decreases as the H / P feed water temperature T1 rises. The difference of becomes smaller.

Therefore, as described above, in the heat pump hot water supply / room heating device of the first embodiment, the temperature of the hot water supply near the intermediate portion of the hot water storage tank 5 is lower than a predetermined temperature (for example, 40 ° C.) and is in a steady operation. When the H / P feed water temperature T1 is equal to or lower than the reference feed water temperature (for example, 30 ° C.), the intermediate temperature is directly warmed {see FIG. 2 (e)}, and the H / P feed water temperature T1 is higher than the reference feed water temperature (for example, 30 ° C.). Sometimes high temperature direct warming {see FIG. 2 (d)} is performed.
When the H / P feed water temperature T1 is low, as shown in FIG. 5, the COP of the heat pump cycle R can be increased by lowering the boiling temperature than by raising the boiling temperature. That is, the COP during the direct warming operation can be increased.

On the other hand, when the H / P feed water temperature T1 is high, the difference in COP is small regardless of whether the boiling temperature is high or low, as shown in FIG. Therefore, when the H / P feed water temperature T1 is high, by raising the boiling temperature, surplus hot water supplied to the hot water storage tank 5 during the direct warming operation can be made hot water. As a result, hot water is stored in the hot water storage tank 5 during the direct warming operation, and it is possible to prevent intermediate hot water from being stored in the hot water storage tank 5 during the direct warming operation. That is, the ratio of the medium temperature water in the hot water storage tank 5 is suppressed, and conversely, the ratio of the hot water in the hot water storage tank 5 increases.
Thus, since the ratio of the medium temperature water in the hot water storage tank 5 is suppressed, when performing the high temperature hot water storage operation at midnight or the like, it is possible to reduce the operation for boiling the medium temperature water into hot water (operation with a low COP). That is, COP at the time of high temperature hot water storage operation can be increased.
Moreover, since the ratio of hot water in the hot water storage tank 5 increases, the operation time of the high temperature hot water storage operation in which the hot water storage tank 5 is heated to hot water at midnight can be shortened, and the power consumption required for the high temperature hot water storage operation can be reduced. be able to.

(Effect 2 of Example 1)
As described above, the heat pump hot water supply / room heating device of the first embodiment is stored in the intermediate portion of the hot water storage tank 5 when the hot water storage temperature in the vertical intermediate portion of the hot water storage tank 5 is higher than a predetermined temperature during the heating operation. The medium temperature water is led to the water / brine heat exchanger 34 and the “floor heating operation using medium temperature heat storage” is performed.
Thereby, the medium temperature water stored in the hot water storage tank 5 can be consumed during the heating operation, and as a result, the temperature of hot water supply water other than hot water in the hot water storage tank 5 can be lowered. As described above, since the temperature of hot water other than hot water in the hot water storage tank 5 can be lowered, the COP when performing a high temperature hot water storage operation at midnight or the like can be increased.

[Modification]
Each numerical value shown in the above-described embodiment is an example for explaining the embodiment, and can be appropriately changed according to the specification or the like.
In the above-described embodiment, an example in which the temperature of the H / P feed water temperature T1 (reference feed water temperature) that switches between high temperature direct warming and intermediate temperature direct warming is set to a constant value is shown, but hysteresis may be provided.
In the above-described embodiment, the example in which the rotational speed of the hot water storage pump P0 is variably controlled as the boiling temperature variable means by the heat pump cycle R has been shown. However, other boiling temperature variable means (for example, the refrigerant compressor 21). The boiling temperature may be varied by using or combining the number of revolutions of the engine and the variable capacity using the variable capacity refrigerant compressor 21.

In the above embodiment, an example in which the floor heating panel 32 is used as an example of the heat radiating panel has been described. However, a heat radiator (heat radiating panel) disposed in a portion other than the floor may be used. Of course, you may use combining the floor heating panel 32 and the heat radiator (heat dissipation panel) arrange | positioned in parts other than a floor.
In the above embodiment, an example using a supercritical heat pump cycle has been shown, but a general heat pump cycle using a chlorofluorocarbon refrigerant (including an alternative chlorofluorocarbon) may be used.
In the above-described embodiment, an example in which the control of the heat pump hot water supply / room heating device is controlled by one control device 4, but the control device may be divided into a plurality of devices.

It is a schematic block diagram of a heat pump type hot water supply and heating device. It is operation | movement explanatory drawing of a heat pump type hot water supply and heating apparatus. It is a flowchart which shows an example of heating operation control. It is a flowchart which shows the example of control of a boiling temperature switching means. It is a graph which shows the relationship between H / P feed water temperature and COP.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tank apparatus 2 Heat pump heat source apparatus 3 Hot water type heating apparatus 4 Control apparatus 5 Hot water storage tank 22 Radiator 26 Refrigerant / water heat exchanger 34 Water / brine heat exchanger R Heat pump cycle

Claims (4)

A hot water storage tank (5) for storing heated hot water,
A heat pump cycle (R) including a radiator (22) for radiating the refrigerant;
A refrigerant / water heat exchanger (26) for heating hot water in the hot water storage tank (5) by heat radiation of the refrigerant in the radiator (22);
A water / brine heat exchanger (34) for heating a heating brine by heat of hot water stored in the hot water storage tank (5) or by hot water heated by the heat pump cycle (R); ,
A controller (4) for controlling the temperature of hot water heated by the heat pump cycle (R),
During the direct warming operation in which the hot water heated by the heat pump cycle (R) is directly supplied to the water / brine heat exchanger (34), the excess amount of the hot water heated by the heat pump cycle (R) is In the heat pump hot water supply and heating device returned to the hot water storage tank (5),
The control device (4) is in a direct warming operation,
When the H / P feed water temperature (T1) led from the hot water storage tank (5) to the refrigerant / water heat exchanger (26) is low, the boiling temperature of the hot water by the heat pump cycle (R) is lowered. Control
When the H / P feed water temperature (T1) guided from the hot water storage tank (5) to the refrigerant / water heat exchanger (26) is high, the boiling temperature of the hot water by the heat pump cycle (R) is set to a high temperature side. A heat pump type hot water supply and heating device comprising a boiling temperature switching means for controlling. In the heat pump hot water supply and heating device according to claim 1,
When the controller (4) controls the boiling temperature of the hot water supply by the heat pump cycle (R) to a low temperature side during the direct warming operation, the surplus amount of hot water heated by the heat pump cycle (R) is Return to the middle of the hot water storage tank (5) in the vertical direction,
When the controller (4) controls the boiling temperature of the hot water supply by the heat pump cycle (R) to the high temperature side during the direct warming operation, the surplus amount of hot water heated in the heat pump cycle (R) is A heat pump type hot water supply and heating device, wherein the hot water storage tank (5) is returned to the upper part in the vertical direction. In the heat pump hot water supply and heating device according to claim 2,
When the predetermined operating condition is established during the heating operation, the control device (4) supplies hot water stored in the intermediate portion in the vertical direction of the hot water storage tank (5) to the water / brine heat exchanger (34). A heat pump hot water supply / room heating device comprising medium temperature storage / execution means for conducting heating operation by guiding to a heat source. In the heat pump hot water supply and heating device according to claim 3,
The time when the predetermined operating condition is satisfied is a time when the hot water storage temperature in the vertical intermediate portion of the hot water storage tank (5) is higher than a predetermined temperature during the heating operation.

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