JPH01230959A - Heat pump type hot water supply apparatus - Google Patents

Abstract

PURPOSE:To prevent the interruption of the flow of hot water and improve the pleasantness in use for users by operating auxiliary heating to raise the temperature up to a second set temperature during the time in which the heating operation is not being made. CONSTITUTION:A specified time memory 48, which stores in the memory a specified time to boil the hot water in a hot water storage tank 31 to a first set temperature, and operation period setting means 51, which sets a heating operation period required for boiling the hot water in the set time of boiling, are provided. A main heating operation control device 52 controls the operation so as to bring the temperature of the hot water in the hot water storage tank near to the first set temperature and auxiliary heat operation control means 53 controls the operation so as to bring the temperature of the hot water in the tank 31 near to a second set temperature which is lower than the first set temperature. And, a supply hot water heating operation control device 54 carries out the operation by the main heating operation control device 52 during heating operation and, on the other hand, the operation is switched to the operation by the auxiliary heating operation control means 53 during the time which is not in the heating operation period.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a heat pump water heater that heats hot water in a hot water storage tank using condensation heat of a refrigerant in a heat pump cycle.

(Prior Art) As a conventional example of the above-mentioned heat pump water heater, there can be mentioned, for example, a device described in Japanese Patent Application Laid-Open No. 59-231354. The device is configured to not only heat the hot water in the hot water storage tank, but also perform indoor cooling/heating/air conditioning operation. In other words, it includes an outdoor heat exchanger, an indoor heat exchanger, and a hot water supply heat exchanger disposed in a hot water storage tank, and recirculates the refrigerant discharged from the compressor from the indoor heat exchanger to the outdoor heat exchanger. The refrigerant discharged from the compressor is recirculated from the hot water heat exchanger to the outdoor heat exchanger, while heating operation is performed by recirculating the refrigerant from the outdoor heat exchanger to the indoor heat exchanger, and cooling operation is performed by circulating the refrigerant from the outdoor heat exchanger to the indoor heat exchanger. Accordingly, a hot water heating operation is performed to heat the hot water in the hot water storage tank.

By the way, the above-mentioned hot water storage tank is installed with a content capacity that can store the total amount of hot water used on -10 days, for example. More specifically, the amount of heat stored in hot water when heated to the maximum temperature that can be heated by a heat pump system, for example 65°C, that is, the amount of heat stored in hot water obtained by multiplying the temperature rise from the water supply water temperature state to the above-mentioned boiling set temperature by the amount of stored hot water. However, the hot water storage tank is selected so that it is approximately equal to the total amount of heat used on day -.

In recent years, replacement type hot water storage tanks have been increasingly adopted, in which hot water is supplied from the upper side and water is simultaneously supplied to the lower side to maintain a constant amount of hot water in the tank. In other words, after the entire hot water in the hot water storage tank has been boiled to the set temperature, the same amount of water as the amount of hot water supplied from the upper side is replenished to the lower side, and within the hot water storage tank, there is a difference in high and low temperatures in the same direction as the direction of gravity. Because of this state, almost no convection occurs, and therefore the hot water on the upper side and the water on the lower side are stored separately. After that, each time hot water is used, the hot water in the upper part, that is, the amount of remaining hot water, gradually decreases, and the amount of water in the lower part increases accordingly, and when the entire hot water storage tank is replaced with water, the remaining hot water The amount of hot water is zero, that is, the hot water is out.

The economical efficiency of the operation of heating the hot water in the hot water storage tank to a set temperature as described above can be improved by specifying the operation time period on -day. In other words, the general hot water usage pattern on day - is that a large amount is used when supplying hot water to the bath in the evening, so the designated time for boiling is set immediately before this hot water supply time, and the designated time is set at this designated time. The heating operation is controlled to be performed only during the heating operation time period that is set to bring the temperature up to the boiling point. Due to dirt, heating operation is performed when the outside temperature is high from daytime to evening, which results in lower energy efficiency (E
Since heating operation is performed in a heat pump cycle with a high ER), operating costs can be reduced. In addition, since most of the water is used immediately after boiling, the amount of heat dissipated into the atmosphere while being kept at a high temperature is also reduced.
This also makes it possible to improve economic efficiency.

(Problems to be Solved by the Invention) By the way, in a heat pump water heater in which the heat source side heat exchanger is placed in the atmosphere, the heating capacity changes depending on the change in the outside air temperature. The lower the outside temperature is, especially in winter, the more heat is required to be stored in the hot water storage tank, but the heating capacity of the heat pump cycle decreases. For this reason, there is a possibility that the required amount of stored hot water heat cannot be provided by operating only during the heating operation time period that is set in accordance with a specific boiling time as described above. Furthermore, in the above-mentioned device that also has an indoor air conditioning function, the refrigerant discharged from the compressor is divided into a hot water supply heat exchanger and an indoor heat exchanger, so that simultaneous operation for hot water supply heating and indoor heating is possible. In this case, as the frequency of heating operation increases in winter, there is a greater possibility that -F heating operation will also be performed during the hot water heating operation time, which will further reduce the hot water heating capacity and cause However, there is a high possibility that the heating will not reach the set temperature. As a result, when supplying hot water to the bath, a large amount of hot water that has not reached the set temperature is used, and the amount of remaining hot water becomes extremely small, causing hot water to run out while a small amount of hot water is used thereafter. This results in a loss of comfort for the user.

The present invention has been made in view of the above, and has the object of: (I) being able to reliably boil water to a set temperature at a designated time in a heat pump water heater having a boiling specification function; It is an object of the present invention to provide a heat pump type water heater that can improve the comfort of use for users by eliminating disconnection, and can also suppress increases in operating costs.

(Means for Solving the Problems) Therefore, as shown in FIG. The hot water supply heat exchanger 23 is connected to the hot water supply heat exchanger 23 for heating the hot water in the hot water storage tank 31, and a hot water temperature detection means 37 is provided to detect the temperature of the hot water in the hot water storage tank 31. a specified time storage means 48 for storing a specified boiling time for heating the water to a first set temperature; an operation period setting means 51 for setting a heating operation period for boiling in accordance with the specified boiling time; A main heating operation control means 52 that controls the operation so that the hot water in the hot water storage tank 31 approaches the first set temperature.
and an auxiliary heating operation control means 53 for controlling the operation so as to bring the hot water in the hot water storage tank 31 close to a second set temperature lower than the first set temperature, and further, during the heating operation period, an auxiliary heating operation is performed. The control means 52 controls the operation, and the auxiliary heating operation control means 53 controls the operation during periods other than the heating operation period. A hot water supply heating operation switching control means 54 is provided.

Further, the heat pump type hot water supply device according to the second claim has the above-mentioned hot water storage tank 31 in the device C according to the first claim.
Further, a hot water amount detection means 37 is provided for detecting the amount of hot water that can be supplied at a high temperature exceeding the second set temperature (L), and the operation by the auxiliary heating operation control means 53 is continued until the detected amount of hot water becomes equal to or less than the reference amount. The hot water supply heating operation switching control means 54 has a first auxiliary heating operation regulating means 55 that stops the operation.

Further, the heat pump water heater according to the third claim is the apparatus according to the first or second claim, which is provided with an outside temperature detection means 3B for detecting the outside temperature state, and when the detected outside temperature is lower than the reference temperature. , the auxiliary heating operation control means 5
Second auxiliary heating operation regulating means 5 that enables operation according to 3.
6 is included in the hot water supply heating operation switching control means 54.

The heat pump water heater according to the fourth aspect is the apparatus according to the first, second, or third aspect, which is provided with a designated boiling operation cancellation switch 49, and when there is a command to cancel the designated boiling operation, the above Main heating operation control means 52
The hot water supply heating operation switching control means 54 includes a designation cancellation shaft operation control means 57 that controls the operation to continue.

(Function) In the heat pump water heater according to the first aspect, the auxiliary heating operation up to the second set temperature is started at times other than the heating operation period, so that If heating is performed from the second setting/crystallinity temperature to the first setting temperature, the required amount of heat to be applied can be reduced. Therefore, even if the heating capacity in the heat pump cycle decreases due to low outside air temperature, for example, high-temperature water heated to the first set temperature will be supplied at the designated boiling time.
It is possible to supply hot water more reliably.

In addition, in the heat pump water heater according to the second aspect, when the amount of hot water remaining in the hot water storage tank 31, that is, the amount of high-temperature hot water that can be supplied exceeding the second setting crystallinity, becomes equal to or less than the reference amount, the above-mentioned 1 when heating to the second set temperature by auxiliary heating operation is started, that is, at least one record μj it? .

Hot water that exceeds the quantity is always ensured. Therefore, by setting the above-mentioned reference amount in accordance with the amount of heat that should be provided in the hot water storage tank 31 at the start of the heating period according to the predicted degree of reduction in heating capacity in the heat pump cycle, During the heating operation period, heating is reliably performed to the first set temperature, and operations during periods other than the heating operation period are suppressed to the necessary minimum, thereby improving economic efficiency.

Furthermore, in the heat pump water heater according to the third aspect, the time when the heating capacity decreases in the heat pump cycle is automatically determined by detecting the outside temperature state, and auxiliary heating in a period other than the above-mentioned heating operation period is performed at this time. It is controlled to perform driving. Therefore, the auxiliary heating operation, which is unnecessary during the summer, for example, is automatically suppressed, so that economical efficiency can also be improved.

In the heat pump water heater according to the fourth aspect, it is possible to cancel the specified boiling operation, and in this case, the operation of heating and maintaining the entire hot water in the hot water storage tank 31 to the first set temperature is performed at all times. be exposed. Therefore, even if the heating capacity in the heat pump cycle is greatly reduced, depending on the user's selection, running out of hot water can be reliably prevented, making it possible to improve the comfort of use.

(Example) Next, a specific example of the heat pump water heater of the present invention will be described in detail with reference to the drawings.

First, FIG. 2 shows a refrigerant circuit diagram of a heat pump system configured as a so-called multi-system, which has not only a hot water heating function but also an indoor cooling/heating/air conditioning function. In the figure, X is an outdoor unit, and this outdoor unit X includes four indoor units A-D and a hot water supply unit Y.
are connected by refrigerant piping.

The outdoor unit +-X has a compressor 1, and a discharge pipe 2 and a suction pipe 3 of the compressor 1 are each connected to a four-way switching valve 4. The compressor 1 has an inverter 5 for controlling its rotational speed, that is, its compression capacity, and the discharge pipe 2 is equipped with a first solenoid valve 6.
However, an accumulator 7 is interposed in each of the suction pipes 3. A first gas pipe 8 and a second gas pipe 9 are connected to the four-way switching valve 4.
is connected to an outdoor heat exchanger (heat source side heat exchanger) 10, and the second gas pipe 9 is connected to a header 11, with a gas shutoff valve 12 interposed therebetween. Further, a first liquid pipe 13 is connected to the outdoor heat exchanger 1o, and this first liquid pipe 13 is connected to a liquid receiver 14, and a first expansion valve 15 is interposed in the middle thereof. has been done. Note that an outdoor fan 29 is attached to the outdoor heat exchanger 10. A second liquid pipe 16 is connected to the liquid receiver 14, and this second liquid pipe 16 has a liquid shutoff valve 17 interposed in the middle, and is connected to the second gas pipe 9. Second liquid pipe 1
A plurality of (four in the case of the figure) branch refrigerant pipes 18...18 are connected in parallel to each other, and each branch refrigerant pipe 18...18 is connected to an indoor heat exchanger. 19
...19 (only one is shown) and the second expansion valve 20...
20 are interposed. Each of the indoor units A to D is composed of the indoor heat exchangers 19...19 and the indoor fans 21...21, although only one indoor unit (A) is illustrated.

On the other hand, a third gas pipe 22 is further connected to the discharge pipe 2 of the compressor 1, and a hot water heat exchanger 23 of a hot water supply unit Y is connected to this third gas pipe 22. The heat exchanger 23 is further connected to the liquid receiver 14 through a third liquid pipe 24 . A second electromagnetic valve 25 is interposed in the third gas pipe 22, and the third liquid pipe 24 is also provided with a second electromagnetic valve 25.
A capillary tube 26 and a check valve 27 are interposed therein. The hot water supply heat exchanger 23 is disposed on the bottom side of the hot water storage tank 31, and the hot water in the hot water storage tank 31 is heated by the condensation heat of the refrigerant condensed in the hot water supply heat exchanger 23. The details will be explained later.

In the heat pump system having the above configuration, refrigerant circulation control during heating and air conditioning operation will be explained next. In this operation, the first solenoid valve 6 is opened, the second solenoid valve 25 is closed, and the refrigerant from compression [1] is It is condensed in each indoor heat exchanger 19 .
After that, the first gas pipe 8, the four-way switching valve 4
This is done by returning the flow from the compressor 1 to the compressor 1. In this case, the degree of superheating of the evaporative refrigerant is controlled by the first expansion valve 15,
In the second expansion valves 20...20, each indoor heat exchanger 19...
Controls the amount of refrigerant distributed to 19. On the other hand, when performing cooling operation, the four-way switching valve 4 is switched, the first electromagnetic valve 6 is opened and the second electric valve 25 is closed, and the compressor 1 is operated as described above. Then, the refrigerant passes through the four-way switching valve 4 and the first gas pipe 8, condenses in the outdoor heat exchanger 10, and then passes through the first liquid pipe 13 and the second liquid pipe 16 into each indoor heat exchanger. 19... 19, and then becomes a flow that is returned to the compressor 1 via the second gas pipe 9 and the four-way switching valve 4. In this case, the first expansion valve 15 is fully opened, and each second expansion valve 20...20T: controls the degree of superheat of the evaporative refrigerant.

Next, in the hot water heating operation, the first solenoid valve 6 is closed, and the second solenoid valve 2 is closed.
5 is opened and the compressor 1 is operated. Then, the refrigerant
It is condensed in the hot water supply heat exchanger 23 via the third gas pipe 22, and then the third liquid pipe 24, the liquid receiver 14, and the first liquid pipe 13.
is evaporated in the outdoor heat exchanger 10, and then the first
The flow is returned to the compressor 1 via the gas pipe 8 and the four-way switching valve 4.

In this case, each second expansion valve 20...20 is fully closed, and the first
The expansion valve 15 controls the degree of superheating of the evaporative refrigerant. For simultaneous operation of heating and hot water supply, the first and second solenoid valves 6.25 are opened, the refrigerant is condensed in both the indoor heat exchanger I9 and the hot water supply heat exchanger 23, and the refrigerant is transferred to the outdoor heat exchanger 10. This can be done by using a refrigerant circuit that evaporates the refrigerant.

Furthermore, in the above system, simultaneous operation of cooling and hot water heating, that is, operation for recovering cooling waste heat into the hot water storage tank 31, is performed by closing the first solenoid valve 6, opening the second solenoid valve 25, and
This is done by fully opening the expansion valve 15. Then, the refrigerant
Condenses in the hot water supply heat exchanger 23 via the gas pipe 22,
It is evaporated in each indoor heat exchanger 19...19 through the third liquid pipe 24, liquid receiver 14 and second liquid pipe 16, and then compressed through the second gas pipe 9 and four-way switching valve 4. It will be flowed back to aircraft 1. In this case, the degree of superheat of the evaporative refrigerant is controlled in each of the second expansion valves 20...20.

Each of the above-mentioned operations has a control configuration in which the indoor temperature and the temperature inside the hot water storage tank 31 are respectively detected, and each detected temperature approaches the set temperature. The case of hot water heating operation will be explained in more detail.

First, to explain the configuration of the hot water supply unit Y shown in FIG. 2, the hot water storage tank 31 is constituted by a cylindrical sealed tank, and its internal capacity is equal to, for example, the total daily hot water usage in winter. A capacity that can store a certain amount (e.g. 30
0 A). A hot water supply pipe 32 is connected to a hot water supply port on the upper end side of the hot water storage tank 31, and a water supply pipe 33 is connected to a water supply port on the lower end side. When a valve (not shown) at the tip end of the hot water supply pipe 32 is opened, the pressure of the tap water acting through the water supply pipe 33 causes the hot water in the hot water storage tank 31 to push up and pass through the hot water supply port. Hot water is supplied to the hot water supply pipe 32. There are four locations on the outer peripheral wall of the hot water storage tank 31 in the vertical direction.
For example, hot water temperature sensors (hot water temperature detection means) 37 . It is designed to detect the temperature of each hot and cold water. By comparing these detected temperatures with, for example, a set temperature, it is possible to determine the amount of hot water in the hot water storage tank 31 that exceeds the set temperature.
Therefore, the hot water temperature sensors 37, . . . 37 described above also have a function as a hot water amount detection means. Further, in the above device, a water supply water temperature sensor 38 made of a thermistor is attached to the water supply pipe 33 as an outside temperature detection means for detecting the state of outside air temperature by detecting the water supply temperature which changes according to changes in the outside air temperature. The temperature of the water replenished into the hot water storage tank 31 through the water supply pipe 33 is detected.

Figure 3 shows a control system diagram for hot water heating operation.
As shown in the figure, the outdoor unit I-X includes an outdoor control device 41 and an inverter control device 42. This inverter control device 42 is for controlling the frequency of the inverter 5, that is, the compression capacity of the compressor 1, to the capacity according to the air conditioning load and the hot water supply load, based on a command from the outdoor control device 41. The outdoor control device 41 further controls the driving speed of the outdoor fan 29, the first and second solenoid valves 6 and 25, and four-way switching according to each operation mode such as heating, cooling, hot water supply, cooling hot water supply, etc. The operation of the valve 4, the first and second expansion valves 15, 20, . . . 20 is controlled.

On the other hand, the hot water supply unit Y includes a hot water supply control device 43 connected to the outdoor control bag W41, and this hot water supply control device 43 includes the hot water temperature sensors 37, . A remote control unit 44 placed in a kitchen or the like is also connected. This remote control box 44 includes a hot water heating operation switch 4.
5, a hot water temperature setting section 46, and a clock function section 47. Further, in the figure, 48 is a designated time storage unit (designated time storage means) which also has the function of displaying a designated time when specifying a boiling time, which will be described later, and 49 is a designated boiling operation cancellation switch.

In the hot water supply control device 43, on the premise that the hot water heating operation switch 45 is in the ON state, the hot water temperature sensor 37
According to each detection signal from the water supply water temperature sensor 38 and the input signal from the remote control box 44, a hot water supply heating operation request signal is outputted to the outdoor control device 41 as appropriate, whereby the hot water supply heating operation described above is performed. However, the control performed by the hot water supply control device 43 will be explained based on the control flowchart 1 in FIG. 4.

First, step S1 is the boiling specified operation cancellation switch 4.
This is a step of determining the operating state of step 9. Here, the case where the operation state is not in the released state, that is, the boiling time specified operation is selected by the user will be described first. At this time, in step S2, the specified time stored in the specified time storage section 48 is read, and then in step S3, the entire water in the hot water storage tank 31 is
Calculate the time required to raise the temperature to the set temperature set in the hot water temperature setting section 46 by the user, determine the operation start time before the designated boiling time, and from this start time to the designated boiling time. is set as the operating time period (heating operation period).

Subsequently, in step S4, it is determined whether the time at the time of this step processing is within the driving time zone set above. If it is outside the above operating hours,
The process moves to steps Sll and subsequent steps, which will be described later. On the other hand, if it is within the above operating time period, in step S5, the heating target set temperature Ts of hot water in the hot water storage tank 31 is set to
The first set temperature Ts set in the hot water temperature setting section 46
O1 is set, and then the detected value Td from the hot water temperature sensor 37 attached to the lowest position of the hot water storage tank 31 is read (step S6), and this detected hot water temperature Td is subtracted from the above set temperature Ts. Find the deviation T (step S7), then determine that this ΔT is positive (step S8)
, the hot water supply heating operation request signal and the above T signal to the outdoor side) 1
1 device 4X (step S9). As a result, the outdoor control device 41 starts a hot water heating operation in which the refrigerant is circulated to the hot water heat exchanger 23. From step S9, the process returns to step si, and as a result of repeating the processes from 31 to S9, the hot water heating operation described above continues, and the detected hot water temperature Td gradually increases. Then, when Td reaches the first set temperature Ts01, that is, when the entire hot water temperature in the hot water storage tank 31 reaches Tsol, ΔT becomes 0, and as a result, the process moves from step S8 to 510, and a hot water heating operation request signal is transmitted. is stopped, and the hot water heating operation is stopped. The operation time period is automatically set so that this boiling time substantially coincides with the specified time.

Such a boiling specification function limits the operation period for heating the entire hot water in the hot water storage tank 31 to the first set temperature TsO1, and as a result, as described above, it is possible to improve the economical efficiency of the hot water heating operation. can.

By the way, the upper limit heating temperature in the above device is 65°C, and within this temperature range, the user can set the first set temperature T.
s01 can be arbitrarily selected. This set temperature is set to a higher value as the outside air temperature becomes lower, that is, in winter, but at this time, the EER (energy efficiency) of the heat pump system decreases, so there is a risk that sufficient heating capacity cannot be maintained. will occur.

In particular, in a configuration in which indoor heating operation and simultaneous operation are performed as in the above embodiment, at this time, the indoor side and the hot water supply unit Y
Because the refrigerant flows in separate flows between the two, the hot water heating capacity is further reduced than when operating alone, and as a result, if the heating operation is performed only during the above operating hours, the heating capacity will be lower than when the heating operation frequency becomes high in winter. , the water in the hot water storage tank 31 is
There is a possibility that the boiling temperature cannot be raised to the set temperature TsO1.

Therefore, in the above-mentioned embodiment, the auxiliary heating operation is performed conditionally even at times other than the above-mentioned operating hours. That is, in step S4 of FIG. 4, if it is outside the operating hours, the process moves to step Sll, and if the determination conditions from step Sll to 313 are satisfied,
In step S14, a second set temperature (for example, 45°C) Ts02 lower than the first set temperature Ts01 is set as the heating target set temperature Ts, and then from step s6 described above to step SIO, and then return to si. Through the process, the heating operation up to the second set temperature Ts02 is performed even outside the operating hours.

In step Sll, the feed water temperature sensor 3
Among the water temperatures detected on day 8, the lowest detected water temperature -1 on day -1 is compared with the reference water temperature Wr. The above-mentioned old value is used as the lowest detected water temperature value in a day because water is supplied to the hot water storage tank 31 at the same time as hot water supply, and the water in the water supply pipe 33 remains at other times. In this stagnation state, the temperature rises due to heat dissipation from the hot water storage tank 31 storing high temperature hot water. Therefore, by further detecting the lowest water temperature on -day, it is possible to detect the water temperature in the water supply, that is, the water temperature that changes with seasonal changes. For example, the above Wr is set to 15°C, and by comparing it with this Wr,
The period of low outside temperature corresponding to winter is determined.

Furthermore, in step S12, among the four hot water temperature sensors 37 attached to the hot water storage tank 31, the temperature is detected by, for example, the second sensor from the top. a Read the hot water temperature m. This Tm is then compared with the second set temperature Ts02 described above in step 513, and when Tm is smaller than Ts02, the process moves to step s14 described above. Note that when Wi Rikishu r is exceeded in step Sll, that is, when the outside air temperature is high except in winter, and when Tm is greater than or equal to Ts02 in step S13,
That is, when hot water remains in the upper region beyond the attachment position of the second hot water temperature sensor 37 that detects the above-mentioned Tm from the upper end hot water supply port in the hot water storage tank 23, each step S
As a result of moving from step S10 to step S10, the hot water heating operation is maintained in a stopped state.

As a result of the above control, for example, when the outside temperature is low in winter, hot water always exceeding the second set temperature is ensured in the hot water storage tank 31 at least above the mounting position of the second hot water temperature sensor 37 from the top. . In other words, in the main heating operation during the limited operating hours, the amount of heat equivalent to or more than the above is calculated by anticipating in advance the amount of heat that will be insufficient when the heating capacity is reduced due to simultaneous operation with heating operation, etc. This is done so that the remaining amount of hot water is maintained.

As a result, it becomes possible to more reliably heat up to the first set temperature requested by the user at the designated time, thereby reducing the risk of running out of hot water and improving the comfort of use for the user. Furthermore, even when a large amount of hot water is used when supplying hot water to the bath, the above-mentioned auxiliary heating operation ensures that hot water exceeding at least the second set temperature is secured in the upper side of the hot water storage tank 31, so that subsequent small amounts of hot water can be used. You don't have to worry about running out of hot water when using it (this improves the comfort of use.

Then, as mentioned above, depending on the time when the heating capacity of the heat pump cycle decreases and the degree of decrease, the amount of hot water storage required when starting the main heating operation, that is, the amount of remaining hot water, is automatically detected and the auxiliary heating is performed. Since the operation is controlled, this operation can be minimized to the necessary minimum, thereby reducing the increase in operating costs.

Note that when the specified boiling time operation cancellation switch in the remote control box 44 is operated to cancel the specified boiling time operation, steps 85 from step Sl in FIG.
The heating operation during the main heating operation described above is carried out at all times through the process from steps 35 to S] and 0 described above. In other words, the make-up water that flows into the hot water storage tank 31 every time the hot water is used is immediately boiled to the first set temperature TsO1, and the entire inside of the hot water storage tank 31 is maintained at high temperature. be. In this way, we have a function to cancel the designated boiling operation, so if the heating capacity in the heat pump cycle is significantly reduced,
Depending on the user's choice, running out of hot water can be reliably prevented and user comfort can be maintained and improved.

Although the above embodiment has been described with reference to an example in which the feed water temperature sensor 38 is provided as a means for detecting the outside air temperature state, it is also possible to adopt a configuration in which the outside air temperature is directly detected, for example. Further, in the above embodiment, the operation period setting means 51 is activated by steps S2 and S3 in FIG. 4, the main heating operation control means 52 is activated by step S5, the auxiliary heating operation control means 53 is activated by step S14, , SLl to S13 to control the hot water supply heating operation switching control means 54, step Sll to turn on the first auxiliary heating operation regulating means 55, steps S12 and S13 to turn on the second auxiliary heating operation regulating means 56, and step S1 to switch off the designated operation. Although an example has been given in which each of the control means 57 is configured and includes any of the auxiliary heating operation regulation means 55, 56 and the designation cancellation operation control means 57, it is possible to select and configure these means as appropriate. It is possible. Furthermore, although the above description has been made using a device that also has an air conditioning function, the present invention can also be applied to a device exclusively for hot water supply.

(Effects of the Invention) As described above, in the heat pump water heater according to the first aspect of the present invention, during periods other than the heating operation period,
Since heating up to the second set temperature is performed by the auxiliary heating operation, the boiling up to the first set temperature can be more reliably achieved even when the heating capacity in the heat pump cycle decreases due to low outside air temperature, for example. As a result, running out of hot water can be prevented, and the user's comfort can be improved.

Further, in the heat pump water heater according to the second aspect, the amount of remaining hot water in the hot water storage tank is set according to the degree of reduction in heating capacity in the heat pump cycle, i.
The auxiliary heating operation is performed when the amount reaches l#, and the frequency of operation can be kept to the minimum necessary, improving economic efficiency without compromising user comfort. can.

Furthermore, in the heat pump water heater according to the third aspect, the time when the heating capacity decreases in the heat pump cycle is automatically determined, and the auxiliary heating operation, which becomes unnecessary in the summer, for example, is automatically suppressed. This makes it possible to improve economic efficiency.

The heat pump water heater according to the fourth aspect has a release function that switches the operation to constantly heat and maintain the hot water in the entire hot water storage tank up to the first set temperature, so that the heating capacity in the heat pump cycle is prevented from decreasing. If the size is too large, the above switching can more reliably prevent hot water from running out, improving the comfort of use.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram of a heat pump water heater of the present invention, Fig. 2 is a refrigerant circuit diagram of an apparatus configured as a heat pump system to which the invention is applied and also has an indoor air conditioning function, and Fig. 3 is a refrigerant circuit diagram of the heat pump system according to the invention. FIG. 4 is a control flowchart of the hot water supply heating operation in the heat pump system. ■... Compressor, 10... Outdoor heat exchanger (heat source side heat exchanger), 23... Hot water supply heat exchanger, 31... Hot water storage tank, 37... Hot water temperature sensor (water temperature detection means, hot water amount detection means), 48... designated time storage unit (designated time storage means), 49... designated boiling operation cancellation switch, 51...
- Operation period setting means, 52...main heating operation control means,
53...Auxiliary heating operation side? : [l1 means, 54...
Hot water heating operation switching control means, 55... First auxiliary heating operation regulating means, 57... Operation eaves side i1 [1 means when designation is canceled.

Claims (1)

[Claims] 1. A heat source side heat exchanger (10) and a hot water supply heat exchanger (23) for heating hot water in a hot water storage tank (31) are connected to the compressor (1). , the above hot water storage tank (31)
A hot water temperature detection means (37) for detecting the temperature of hot water in the hot water storage tank (31) is disposed, and a designated time storage means (37) for storing a designated boiling time for heating the hot water in the hot water storage tank (31) to a first set temperature. 48), and an operation period setting means (5) for setting a heating operation period for boiling in accordance with the specified boiling time.
1), a main heating operation control means (52) that controls the operation of hot water in the hot water storage tank (31) to bring it close to the first set temperature, and a main heating operation control means (52) that controls the operation of the hot water in the hot water storage tank (31) to bring it close to the first set temperature; An auxiliary heating operation control means (53) is provided to control the operation so as to bring the hot water in the hot water storage tank (31) closer to each other.
Furthermore, during the heating operation period, the main heating operation control means (
hot water heating operation switching control means (52), while controlling the operation to be performed by the auxiliary heating operation control means (53) during periods other than the heating operation period;
4) A heat pump type hot water supply device. 2. In the hot water storage tank (31), a hot water amount detection means (
A first auxiliary heating operation control means (55) for stopping the operation by the auxiliary heating operation control means (53) until the detected amount of hot water becomes equal to or less than a reference amount is further provided. ) The heat pump type hot water supply device according to claim 1, characterized in that the heat pump type hot water supply device has: 3. A second auxiliary heating operation that includes an outside temperature detection means (38) that detects the outside temperature state, and enables operation by the auxiliary heating operation control means (53) when the detected outside temperature is lower than the reference temperature. A first method characterized in that the hot water supply heating operation switching control means (54) has the regulating means (56).
Or a heat pump water heater according to claim 2. 4. A specified boiling operation cancellation switch (49) is provided, and when there is a specified boiling operation cancellation command, a specified operation control means (57) for controlling the main heating operation control means (52) to continue the operation. A heat pump type hot water supply apparatus according to claim 1, wherein said hot water supply heating operation switching control means (54) has the following.