JPH01234763A - Heat pump system - Google Patents

Abstract

PURPOSE:To improve comfortableness for a user of an air-cooled room and a person taking a hot bath by a method wherein a cooling operation is carried out at the time of a mode batting of air cooling and bath heating, and when the temperature of hot water in a bathtub is lowered to such a level that additional heating is required, the hot water temperature is increased upto a necessary degree by supplying hot water stored in a hot water storage tank. CONSTITUTION:In the case where a cooling signal and a bath signal are simultaneously inputted, a bath heating operation is maintained in a stopped state by a first overlapping mode time controlling means for giving priority to a cooling operation. Further, an additional heating unit Y has a bath controller 51 to which a sensor 39 for detecting the temperature of hot water in a bathtub and a remote control device 52 for an additional heating operation are connected. The remote control device 52 for the additional heating operation is provided with a hot-water temperature setting switch and an operating switch, and when the operating switch is kept on and a hot water temperature detected by the sensor 39 for detecting the temperature of hot water in the bathtub is lower than a preset hot water temperature, a signal requiring a bath heating operation is sent from the bath controller 51 to an outdoor controller 41.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multifunctional heat pump system that has, in addition to an air conditioning function, a function of heating bath water and heating hot water in a hot water storage tank.

(Conventional technology) Air conditioners that use a refrigerant heat pump cycle are
In recent years, it has been put into practical use as a so-called multi-air conditioner, in which multiple indoor units are connected in parallel to one outdoor unit to simultaneously operate air conditioning in multiple rooms. The publication describes an apparatus configured to have an air conditioning function and a bath heating function by replacing one of a plurality of indoor units with a bath heating unit. In a device with such a configuration, it is possible to have a bath heating function without making any major changes to the outdoor unit, and the gas refrigerant discharged from the compressor can be transferred to the indoor heat exchanger and bath heat. Simultaneous operation of heating and bath heating is also possible by circulating the refrigerant by dividing the flow into the exchanger and then circulating the refrigerant to the outdoor heat exchanger.

Then, as mentioned above, the indoor unit and the bath heating unit are connected in parallel to each other in the outdoor unit, and a hot water heating unit is also installed to provide an air conditioning function, a heating function for the bathtub water, and a function for heating the hot water in the hot water storage tank. Devices configured as multifunctional heat pump systems having a heating function are also being put into practical use.

(Problems to be Solved by the Invention) By the way, in a configuration in which an indoor unit and a bath heating unit are connected in parallel to the outdoor unit, although heating and bath heating can be operated simultaneously, cooling and bath heating cannot be performed simultaneously. simultaneous operation is not possible. In other words, it is necessary for the outdoor heat exchanger to function as a condenser when cooling the bath, and as an evaporator when heating the bath.
This is because so-called mode batting occurs. Therefore, conventionally, when mode switching between air conditioning and bath heating is performed, priority is given to bath heating. In other words, if the bath heating is stopped, it is expected that the bather will feel extremely uncomfortable.

However, if the above-mentioned bath heating is reheating the bath water, this operation period will be relatively short, and the cooling will be restarted relatively quickly, but during this time, the cooling will be stopped. As a result, the problem that the comfort of air conditioner users is impaired cannot be solved.

This invention has been made in view of the above, and its purpose is to improve the comfort of use when various operation modes overlap in the multifunctional heat pump system as described above, and to provide a heat pump system that can also improve economic efficiency. Our goal is to provide the following.

(Means for Solving the Problems) Therefore, as shown in FIG. In the outdoor unit) A hot water heating unit Z having a hot water heat exchanger 23 for heating hot water in the hot water storage tank 31 is provided, and the indoor unit 1-A is
, B, and C in response to a cooling operation request signal;
An operation control means 41 is provided for controlling the bath heating operation in response to the bath heating operation request signal from the reheating unit (reheating unit) Y and the hot water heating operation in response to the hot water heating operation request signal from the hot water heating unit Z, respectively. a heat pump system comprising: a first duplication mode control means 61 for giving priority to the cooling operation when the cooling operation request signal and the bath heating operation request signal are generated simultaneously;
The operation control means 41 has the following.

Further, the heat pump system according to the second claim is the apparatus according to the first claim, in which the heat exchanger 23 for hot water supply
is connected between the discharge pipe 2 leading from the compressor 1 to the four-way switching valve 4 and the liquid pipe 13 leading from the outdoor heat exchanger 10 to the indoor heat exchanger 19, and also for refrigerant circulation during hot water heating operation. The route is from the hot water supply heat exchanger 23 to the outdoor heat exchanger 1.
0, and the hot water supply heat exchanger 2.
3 to the indoor heat exchanger 19, and when the cooling operation request signal and the hot water supply heating operation request signal are generated simultaneously, the second circulation path
The operation control means 41 has a second duplication mode control means 62 that controls switching to the circulation path.

The heat pump system according to a third aspect of the present invention is the apparatus according to the first or second aspect, in which the bath heating operation is performed when the bath heating operation request signal and the hot water supply heating operation request signal are generated at the same time. The operation control means 41 has a third duplication mode control means 63 which is given priority.

(Function) In the heat pump system according to the first aspect, the cooling operation is performed when the modes of cooling and bath heating are mixed, so that the comfort of the cooling user is maintained. In response to a drop in the temperature of the bathtub water that requires reheating, the hot water stored in the hot water storage tank 31 can be added to the hot water tank 31 to raise it to the required temperature, making it comfortable for the bather. As a result, the comfort of use during mode batting can be improved compared to before.

Furthermore, in the heat pump system according to the second aspect, by switching to the second circulation path, the hot water supply heat exchanger 23 required for the hot water supply heating operation functions as a condenser, and the indoor heat exchanger necessary for the cooling operation functions as a condenser. 19 is maintained as an evaporator, and therefore cooling and hot water heating are operated simultaneously, and the hot water heating at this time is performed using cooling exhaust heat, so the heating cost is reduced. Almost never occurs. By pouring the stored hot water at low heating cost into the bathtub during the mode switching between cooling and bath heating, it is also possible to reduce operating costs.

In the heat pump system according to the third aspect, when the bath heating operation request signal and the hot water supply heating operation request signal are generated simultaneously, the bath heating operation is performed with priority. In other words, the gas refrigerant discharged from the compressor 1 is divided and supplied to the bath heat exchanger 30 and the hot water supply heat exchanger 23, and then circulated to the outdoor heat exchanger IO to simultaneously heat the bath and hot water. It is also possible to operate, but in this case, the heating capacity of each heat exchanger 30, 23 is lower than when it is used alone. Therefore, we decided to stop the hot water heating operation that does not require much immediate heating and increase the heating capacity of bath heating. This allows the temperature of the bathtub water to rise quickly, thereby improving the comfort of the bather.

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

First, FIG. 2 shows a refrigerant circuit diagram. In the figure,
X is an outdoor unit, and this indoor 1 outdoor unit
Three indoor units A to C, a reheating unit Y, and a hot water heating unit Z are connected by refrigerant piping.

The outdoor unit +-X has compression @1, and the discharge pipe 2 and suction pipe 3 of this 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 the outdoor heat exchanger 10, and the second gas pipe 9 is connected to the outdoor heat exchanger 10.
is connected to the header 11, and a gas shutoff valve 12 is interposed in the middle. In addition, the outdoor heat exchanger 10
A liquid pipe 13 is connected to the liquid pipe 13, and a first expansion valve 14, a liquid receiver 15, and a liquid shut-off valve 16 are interposed in this liquid pipe 13 in this order from the outdoor heat exchanger side. Note that an outdoor fan 17 is attached to the outdoor heat exchanger 10. Between the liquid pipe 13 and the second gas pipe 9, there are a plurality of (four in the figure) branch refrigerant pipes 18...18 each having a second expansion valve 20...20 interposed therein. They are connected in parallel to each other, and indoor heat exchangers 19...19 (only one is shown) are interposed in the three branch refrigerant pipes 18...18, respectively. In addition, each indoor unit A-C is
Although only one indoor unit (A) is shown in the figure, it is constituted by the above-mentioned indoor heat exchangers 19...19 and indoor fans 21...21. On the other hand, the branch refrigerant pipe 18
- The bath heat exchanger 30 in the reheating unit (Y) is interposed in the remaining one of 18. The configuration of this reheating unit Y will be explained later.

The discharge pipe 2 of the compressor 1 further includes a third gas pipe 22.
At the same time, a hot water supply heat exchanger 23 of the hot water supply heating unit Y is connected to this third gas pipe 22, and this hot water supply heat exchanger 23 is further connected to a hot water supply side liquid pipe 24.
It is connected to a liquid receiver 15 interposed in the liquid pipe 13. A second electromagnetic valve 25 is provided in the third gas pipe 22, and a capillary tube 26 and a check valve 27 are provided in the hot water supply side liquid pipe 24.

Note that the hot water supply heat exchanger 23 is disposed on the bottom side of the hot water storage tank 31. This hot water storage tank 31 is constituted by a cylindrical sealed tank, and its internal capacity is set to be enough to store the total amount of hot water used in one day in winter (for example, about 3002 liters). This hot water tank 3
A hot water supply pipe 32 is connected to the hot water supply port on the upper end side of 1, and a water supply pipe 33 is connected to the 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,
At the same time, water is newly added to the lower part through the water supply port.

A hot water temperature sensor 34 composed of, for example, a thermistor is attached to the lower part of the outer peripheral wall of the hot water storage tank 31. Based on the temperature detected by the hot water temperature sensor 34, the hot water supply heat exchanger The hot water in the hot water storage tank 31 is heated by the heat of condensation of the refrigerant condensed at 23.

On the other hand, the above-mentioned reheating unit) Y has the above-mentioned bath heat exchanger 30, and a water artificial pipe 36 and a water outlet pipe 37 that connect the bath heat exchanger 30 to the bathtub 35. . A pump 38 is interposed in the water pipe 36, and by operating the pump 38, hot water in the bathtub 35 is circulated through the bath heat exchanger 30. At this time, the heat of condensation of the condensed refrigerant in the bath heat exchanger 30 is applied to raise the temperature of the bathtub groove. Note that the reheating unit) Y is capable of heating from the water supply temperature state, but normally, when reheating is performed in response to a drop in temperature after the hot water stored in the hot water storage tank 31 is supplied to the bathtub 35. used for. Further, a bathtub water temperature sensor 39 is attached to the water pipe 36 to detect the bathtub water temperature.

In the heat pump system with 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 the compressor 1 is It is condensed in each indoor heat exchanger 19...19 via the four-way switching valve 4 and the second gas pipe 9, then evaporated in the outdoor heat exchanger 10 via the liquid pipe 13, and then This is done by returning the flow from the gas pipe 8 and the four-way switching valve 4 to the compressor 1. In this case, the degree of superheating of the evaporative refrigerant is controlled by the first expansion valve 14, the second expansion valve 20...
At 20, the amount of refrigerant distributed to each indoor heat exchanger 19 is controlled. The bath heating operation can be performed in the same refrigerant circulation direction as the heating operation described above, by causing the bath heat exchanger 30 to function as a condenser.

On the other hand, when performing cooling operation, the four-way switching valve 4 is switched, the first solenoid valve 6 is opened in the same manner as described above, and the second solenoid valve 2 is opened.
5 is closed and the compressor 1 is operated.

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 liquid pipe 13 and evaporates in each indoor heat exchanger 19. Then, the flow returns to the compressor 1 via the second gas pipe 9 and the four-way switching valve 4. In this case, the first expansion valve 14 is fully opened, and the degree of superheat of the evaporative refrigerant is controlled by each second expansion valve 20.

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 condenses in the hot water supply heat exchanger 23 via the third gas pipe 22, and then evaporates in the outdoor heat exchanger 10 via the hot water supply side liquid pipe 24, liquid receiver 15, and liquid pipe 13. , and then returns to the compressor 1 via the first gas pipe 8 and the four-way switching valve 4 (hereinafter, such a refrigerant circulation path during single hot water supply heating operation will be referred to as the first circulation path). . In this case, each of the second expansion valves 20 . . . 20 is fully closed, and the first expansion valve 14 controls the degree of superheating of the evaporative refrigerant. For simultaneous operation of hot water supply and heating or bath heating, open the first and second solenoid valves 6.25 and connect the indoor heat exchanger 19 or bath heat exchanger 30 to the hot water supply heat exchanger 23. This can be done using a refrigerant circuit that condenses the refrigerant in both and evaporates it in the outdoor heat exchanger 10.

Furthermore, in the above system, simultaneous operation of cooling and hot water heating, that is, operation of heating hot water in the hot water storage tank 31 using exhaust heat from the air conditioning, is possible. , and the first expansion valve 14 is fully opened.

Then, the refrigerant passes through the third gas pipe 22, condenses in the hot water supply heat exchanger 23, passes through the hot water supply side liquid pipe 24, liquid receiver 15, and liquid pipe 13, and enters each indoor heat exchanger 19. After that, it is returned to the compressor 1 via the second gas pipe 9 and the four-way switching valve 4. is called the second circulation path). In this case, the degree of superheating of the grass refrigerant is controlled in each of the second expansion valves 20...20. In addition, in the above, it is also possible to recover the waste heat of the bathtub hot water after bathing to the hot water storage tank 31 by using a refrigerant circulation path that circulates from the hot water supply heat exchanger 23 to the bath heat exchanger 30. be.

Next, the operation control circuit of the heat pump system will be explained based on FIG. 3, but for convenience, the case where the air conditioning operation is set to the cooling operation will be explained below. As shown in the figure, the outdoor unit X includes an outdoor control device (operation control means) 41, an inverter control device 42, and a valve switching control device 43.

The inverter control device 42 controls the frequency of the inverter 5 according to a command from the outdoor control device 41, that is, the frequency of the compressor 1.
The valve switching control device 43 controls the first and second solenoid valves 6.25, the four-way switching valve 4, and the This is for controlling the operation of the first and second expansion valves 14, 20, . . . 20 to control the refrigerant circulation path according to each of the above-mentioned operation modes.

On the other hand, indoor units A-C are performed only for the indoor control device 45 (one indoor unit is shown) A; the same applies hereinafter).
The indoor control device 45 is connected to a remote control switch 46 and a room temperature detection sensor 47, respectively. The remote control switch 46 has an operation switch for cooling the indoor unit A and a room temperature setting switch for setting a desired temperature, and when the operation switch is ON and the room temperature is detected. When the room temperature detected by the sensor 47 becomes higher than the set room temperature,
A cooling operation request signal is transmitted from the indoor control device 45 to the outdoor control device 41.

Further, the reheating unit Y has a bath control device 51, and the bathtub water temperature detection sensor 39 described above and a remote control 52 for reheating operation are connected to this bath control device 51. The reheating operation remote control 52 is provided with a hot water temperature setting switch and an operation switch, and when the operation switch is ON and the bathtub water temperature detection sensor 39
When the detected hot water temperature is lower than the set hot water temperature, a bath heating operation request signal is transmitted from the bath control device 51 to the outdoor control device 41.

On the other hand, the hot water heating unit Z has a hot water supply control device 1i153 connected to the outdoor control device 41, and the hot water temperature sensor 34 is connected to this hot water supply control device 43. A remote control box 54 disposed at a remote control station, etc. is connected thereto.

This remote control box 54 is provided with a hot water heating operation switch and a hot water temperature setting switch.

When the hot water heating operation switch is ON and the temperature detected by the hot water temperature sensor 34 becomes lower than the set hot water temperature, the hot water supply control device 53 sends a hot water heating operation request signal to the outdoor control device 41. Sent.

In the outdoor control device 41 to which each of the above-mentioned operation request signals is input, even when each of the above-mentioned signals is input redundantly,
According to the operation mode determination program shown in FIG. 4, one operation mode is specified from among the above-mentioned operation modes and the operation is controlled. That is, in step SL shown in FIG. 4, it is first determined whether or not there is a cooling operation request signal (hereinafter abbreviated as a cooling signal). If this signal is input, then in step S2 it is determined whether or not there is a hot water supply heating operation request signal (hereinafter abbreviated as hot water signal), and if the hot water supply signal is also input, the second Make it a circulation path (Step S)
3) Simultaneous operation of cooling and hot water heating is performed (step S4). Initially, the process from step S4 to 31 is repeated, and the process from step s1 to 84 is repeated to continue the cooling/hot water heating operation. On the other hand, if there is no hot water supply signal, the process moves from step S2 to step s5, and at this time the cooling operation is performed.

In this way, when there is a cooling signal, the cooling/hot water heating operation or cooling operation is performed without determining whether there is a bath heating operation request signal (hereinafter abbreviated as the bath signal), and the bath heating operation is stopped. will be maintained. Then, on the premise that there is no cooling signal, steps S1 to S are performed.
6, it is determined whether or not there is a bath signal. That is, the step Sl constitutes a first duplication mode control means 61 that gives priority to the cooling operation when the cooling signal and the bath signal are input at the same time. Further, steps S2 and S3 are processing steps that constitute the second duplication mode control means 62 that switches to the second circulation path when the cooling signal and hot water supply signal are input simultaneously.

In addition, when the above-mentioned cooling/hot water heating operation or cooling operation is being performed, the operating status is displayed on the pilot lamp of the reheating operation remote control 52 to inform the bather that the bath heating operation cannot be performed. I have to.

Next, if there is no cooling signal (and if there is a bath signal, steps Sl, S6, and S7 are repeated, and step S
At step 7, the bath heating operation is controlled. At this time, the bath heating operation is performed without determining the presence or absence of the hot water supply signal. In other words,
When there is no cooling signal and the bath signal and hot water supply signal overlap, the third duplication mode control means 63 is configured in step S6, which prioritizes the bath heating operation.

When neither the cooling signal nor the bath signal is present, the process moves from steps S1 to 36 and S8. In step S8, it is determined whether or not there is a hot water supply signal. When there is a hot water supply signal, the first Hot water heating operation using the circulation route is performed in step S10. Further, if there is no hot water supply signal, the operation is maintained in a stopped state in step Sll, and steps S1, S6, S8,
Sll is repeated and maintained in a standby state waiting for the generation of any operation request signal.

As a result of the above control, when the modes of cooling and bath heating cannot be operated simultaneously, the cooling operation is performed with priority. Conventionally, priority has been given to bath heating for bathers, who feel more uncomfortable when the air conditioner is shut down than for air conditioner users. However, in the configuration in which the hot water storage tank 31 is provided as described above, it is common that the hot water storage tank 31 is installed with a capacity that matches the amount of hot water used per day in the winter, and therefore the air conditioner is In the summer when it is necessary to
It is assumed that there is a sufficient amount of hot water left even immediately after a large amount of hot water is used by supplying hot water to the bath. Therefore, when the temperature of the bathtub water drops and requires reheating, it is possible to raise the temperature to the required level by pouring hot water from the hot water storage tank 31. As a result, compared to the conventional case where the air conditioning comfort of the air conditioner users was impaired,
In the above, the comfort of both the air conditioner user and the bather can be maintained.

Further, when the configuration is such that hot water can be heated using cooling exhaust heat as in the above embodiment, the cost of heating the hot water in the hot water storage tank 31 is almost zero.

By using such extremely inexpensive hot water instead of reheating, economic efficiency can be greatly improved.

Furthermore, in the above case, when there are operational demands for bath heating and hot water heating at the same time, by giving priority to bath heating, the heating capacity in the heat pump cycle is concentrated on reheating operation, and as a result, the temperature of the bath water increases quickly. Since the temperature can be automatically restored to the set temperature in a short period of time, the comfort of the bather is further improved.

(Effects of the Invention) As described above, in the heat pump system according to the first aspect of the present invention, the hot water in the hot water storage tank can be raised to the required temperature by pouring hot water into the bathtub. Cooling operation can be performed when mode battles between cooling and bath heating are performed. Therefore, the comfort of both the air conditioner user and the bather is not impaired, and it is possible to improve the comfort of use during mode batting compared to the past.

In addition, in the heat pump system according to the second aspect, hot water is heated using cooling exhaust heat, so that hot water with a low heating cost can be stored in the hot water storage tank, and this hot water can be used for the above-mentioned cooling and heating. By pouring hot water into the bathtub when the mode is combined with bath heating, it is possible to reduce operating costs.

In the heat pump system according to the third aspect, when the bath heating operation request signal and the hot water supply heating operation request signal are generated at the same time, the bath heating operation is given priority, and the operation with increased heating capacity of the bath heating is performed. As a result, the temperature of the bathtub water can be quickly raised, and the comfort of the bather can be improved.

[Brief explanation of the drawing]

Figures 1 to 4 are diagrams showing an example of the heat pump system of the present invention, in which Figure 1 is a functional system diagram, Figure 2 is a refrigerant circuit diagram, Figure 3 is a block diagram of an operation control system, and Figure 4 is a diagram showing an example of the heat pump system of the present invention. is a flowchart of the operation control method. X...Outdoor unit, A, B, C...Indoor unit, Y...Reheating unit, Z...Hot water heating unit, 1...Compressor, 2...Discharge piping, 4... ...Four-way switching valve, 10...Outdoor heat exchanger, 13...Liquid pipe, 19
... Indoor heat exchanger, 23 ... Hot water supply heat exchanger, 30
...Bath heat exchanger, 31...Hot water storage tank, 41.
. . . outdoor control device (operation control means), 61 . . . first duplication mode control means, 62 . . . second duplication mode control means, 63 . . . third duplication mode control means. Patent applicant: Daikin Industries, Ltd. Representative: Masahiro Nishimori [(Tatsumi Figure 1 Figure 3 4.5 Figure 4

Claims (3)

[Claims] 1. Compressor (1), four-way switching valve (4), and outdoor heat exchanger (
10), and an indoor unit (A) (B) (C) having an indoor heat exchanger (19);
A reheating unit (Y) having a bath heat exchanger (30) for heating bath water is connected in parallel with another, and a hot water supply heat exchanger for heating hot water in a hot water storage tank (31). (23) A hot water heating unit (Z) is provided, which performs cooling operation in response to cooling operation request signals from the indoor units (A), (B), and (C), and bath heating operation from the reheating unit (Y). A heat pump system comprising an operation control means (41) for controlling a bath heating operation in response to a request signal and a hot water supply heating operation in response to a hot water heating operation request signal from the hot water supply heating unit (Z), respectively. , the operation control means (41) includes a first duplication mode control means (61) that gives priority to the cooling operation when the cooling operation request signal and the bath heating operation request signal are generated at the same time. A heat pump system characterized by: 2. The hot water supply heat exchanger (23) is connected to the compressor (1).
It is connected between the discharge pipe (2) leading from to the four-way switching valve (4) and the liquid pipe (13) leading from the outdoor heat exchanger (10) to the indoor heat exchanger (19), and is also used for hot water heating operation. A first circulation path that circulates the refrigerant from the hot water supply heat exchanger (23) to the outdoor heat exchanger (10), and a first circulation path that circulates the refrigerant from the hot water supply heat exchanger (23) to the indoor heat exchanger (19). ), the second circulation path is configured to be switchable between the second circulation path and the second circulation path, and is controlled to switch to the second circulation path when the cooling operation request signal and the hot water supply heating operation request signal are generated at the same time. 2. The heat pump system according to claim 1, wherein the operation control means (41) includes a duplication mode control means (62). 3. The operation control means (41) includes a third duplication mode control means (63) which gives priority to the bath heating operation when the bath heating operation request signal and the hot water supply heating operation request signal are generated simultaneously. The first characteristic is that
Or the heat pump system according to claim 2.