JPH07111279B2 - Heat pump system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention is configured by connecting a heat source side unit having a compressor and a heat source side heat exchanger to use side heat exchangers having different condensing capacities. It relates to a heat pump system.

(Prior Art) As a conventional example of the heat pump system as described above, for example, an apparatus described in JP-A-62-258953 can be cited. In the device, a bathtub unit having a bath heat exchanger and a bathroom heating unit having a bathroom heat exchanger are connected to an outdoor unit that internally houses a compressor and an outdoor heat exchanger. A bathtub heating request signal is output from the bathtub unit when the bathtub hot water is lower than the set hot water temperature, and at this time, the refrigerant discharged from the compressor is circulated from the bathtub heat exchanger to the outdoor heat exchanger, Performing bathtub heating operation to apply the refrigerant condensation heat in the bathtub heat exchanger to the bathtub hot water, and the bathroom heating unit outputs a bathroom heating request signal when the temperature of the bathroom falls below a set temperature, At this time, the bathroom heat exchanger is heated by operating the bathroom heat exchanger to function as a condenser.

By the way, the bath heat exchanger as described above is configured to have a relatively large condensing capacity in order to quickly raise the temperature of the bath water whose temperature has dropped, and has a large condensing capacity with the bathroom heat exchanger. There is a difference between. Further, normally, a compressor whose variable compression capacity is controlled by inverter frequency control controls the amount of circulating refrigerant that can correspond to each of the use side heat exchangers having different condensation capacities as described above. For example, when the bathroom heating is continued after the end of the bathtub heating operation, the operating frequency of the compressor at the high frequency corresponding to the large condensing capacity of the bathtub heat exchanger up to that time is set to the bathroom heat exchange. By automatically changing to a low initial frequency set in advance corresponding to the condensing capacity of the vessel, operation is performed with the compressing capacity corresponding to the change in the condensing capacity.

(Problems to be Solved by the Invention) However, the above-mentioned decrease in the operating frequency of the compressor requires control to gradually reduce it over a certain period of time, and therefore, immediately after switching from the bathtub heating operation to the bathroom heating operation. The compressor discharges an excessive amount of refrigerant with respect to the condensation capacity of the bathroom heat exchanger, resulting in an increase in high pressure. When this increase in pressure reaches the allowable upper limit pressure, the protective function operates to forcibly stop the compressor, and there are cases where the operation cannot be continued.

The present invention has been made in view of the above, and an object thereof is to provide a heat pump system capable of suppressing a pressure increase at the time of switching the operation to a utilization side heat exchanger having a small condensing capacity and thereby reducing the frequency of stoppage of the operation. To provide.

(Means for Solving the Problem) Therefore, as shown in FIG. 1, the heat pump system of the present invention includes a heat source side unit X having a compressor 1 and a heat source side heat exchanger 12 each having a variable compression capacity, First heat exchanger 29
First use side unit W having the above, and the first heat exchanger 29
The second heat exchanger 30 having the second heat exchanger 30 having a smaller condensing capacity is connected to each of the second heat exchanger units Z, and the first heat exchanger is responsive to the operation request signal from the first user unit W.
The compressor 1 is operated at a compression capacity corresponding to the condensation capacity at 29, and the refrigerant discharged from the compressor 1 is transferred to the first heat exchanger 29.
From the heat source side heat exchanger 12 to the heat source side heat exchanger 12, while the compressor 1 has a compression capacity corresponding to the condensation capacity of the second heat exchanger 30 in response to an operation request signal from the second usage side unit Z.
A heat pump system comprising: an operation control means 60 for controlling the discharge refrigerant from the compressor 1 to flow from the second heat exchanger 30 to the heat source side heat exchanger 12 by operating When switching from the operating state in which the first heat exchanger 29 functions as a condenser to the operating state in which the second heat exchanger 30 functions as a condenser, the first and second heat exchangers 29, 30 are A switching control unit 63 is provided for switching both of them so that only the second heat exchanger 30 functions as a condenser after both functions as a condenser for a predetermined time.

(Operation) In the heat pump system having the above configuration, the operating state in which the first heat exchanger 29 having a large condensing capacity functions as a condenser is changed to the operating state in which the second heat exchanger 30 having a small condensing capacity functions as a condenser. When switching between the above,
Both of the second heat exchangers 29 and 30 function as condensers for a predetermined time, and during this period, the condensation capacity does not decrease. Therefore, during this period, it is possible to reduce the operating state of the compressor 1 to a compression capacity commensurate with the condensing capacity of the second heat exchanger 30 without increasing the pressure, and only the second heat exchanger 30 thereafter. The operation can be continued with the compressor 1 having a compression capacity commensurate with the condensation capacity of the second heat exchanger 30 by switching to the operation in which the compressor functions as a condenser.

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

FIG. 2 shows a schematic diagram of the overall configuration of the heat pump system in one embodiment of the present invention. In FIG. 2, X is an outdoor unit as a heat source side unit, and the outdoor unit X has three units. Indoor unit A of
B, C, a hot water tank unit Y, a bathtub heating unit (first usage side unit) W, and a bathroom heating unit (second usage side unit) Z are connected to each other.

FIG. 3 is a refrigerant circuit diagram in the heat pump system having the above-described configuration. As shown in the figure, the compressor 1 is installed in the outdoor unit X, and the suction pipe 3 of the discharge pipe 2 of the compressor 1 is installed. Are connected to the four-way switching valve 4, respectively. The compressor 1 has an inverter 5 for controlling its rotation speed, that is, its compression capacity. The discharge pipe 2 is provided with a first solenoid valve 6 and a high pressure switch 7 attached thereto. The suction pipe 3 is provided with an accumulator 8.

The four-way switching valve 4 further includes a first gas pipe 9 and a second gas pipe.
An outdoor heat exchanger 12 provided with an outdoor fan 11 is connected to the second gas pipe 10. A liquid pipe 13 is further connected to the outdoor heat exchanger 12, and a drier filter 14, a first electric expansion valve 15, and a liquid receiver 1 are sequentially connected to the liquid pipe 13.
6, the first liquid shutoff valve 17 is provided, and its tip is
The first to fourth liquid branch pipes 19 to 22 are respectively provided with the second electric expansion valves 18 ...

On the other hand, the first gas pipe 9 is provided with a first gas shutoff valve 23, and its tip is branched into first to fourth gas branch pipes 24 to 27, and the first to third liquid branch pipes 19 are provided. ~ 21 and the first to third gas branch pipes 24 to 26, indoor heat exchangers 28 (only the indoor unit A is shown) 28 respectively installed in the indoor units A to C are connected, and the fourth Liquid branch pipe 22
And the fourth gas branch pipe 27, the bath heat exchanger (first heat exchanger) 29 of the bathtub heating unit W connected in series with each other
And the bathroom heat exchanger (second heat exchanger) 30 of the bathroom heating unit Z are connected. The above indoor heat exchangers 28
Each has an indoor fan 31 attached thereto. The configurations of the bathtub / bathroom heating units W and Z will be described later.

On the other hand, a hot water supply gas pipe 32 is further connected to the discharge pipe 2 of the compressor 1, and a hot water supply liquid pipe 33 is connected to the liquid receiver 16, respectively, and these hot water supply gas pipe 32 and hot water supply liquid pipe 33 are connected. A heat exchanger 35 for hot water supply arranged in the hot water storage tank 34 of the hot water storage tank unit Y is connected between and. A second solenoid valve 36 and a second gas closing valve 37 are sequentially provided in the hot water supply gas pipe 32, and a second liquid closing valve 38 is provided in the hot water supply liquid pipe 33. At the same time, a series-parallel circuit including a first capillary tube 39 and a check valve 40, and a second capillary tube 41 and a third electromagnetic valve 42 is provided.
In the hot water supply heating operation described later, the check valve 40 side serves as a refrigerant flow passage, while defrosting operation for removing frost adhering to the outdoor heat exchanger 12 is performed when the hot water in the hot water storage tank 34 is used. The third solenoid valve 42 is opened to allow the refrigerant to flow through the second capillary tube 41. An electromagnetic valve 56 is provided in the return pipe 55 from the hot water supply heat exchanger 35 to the compressor 1 during the defrost operation.

The bath heating unit W includes the bath heat exchanger 29,
It has a water outward pipe 44 and a water return pipe 45 that connect this to the bathtub 43. A circulating pump 46 is provided in the water outgoing pipe 44, and by operating the circulating pump 46,
The hot water in the bathtub 43 circulates through the bath heat exchanger 29 in the path direction from the water outward pipe 44 to the water return pipe 45. At this time, by circulating the refrigerant through the bath heat exchanger 29 so that it acts as a condenser, heat for condensing the refrigerant is applied to the circulating hot water to perform a bath heating operation in which the temperature of the bath hot water is increased. Although it is possible to heat the bath hot water from the state of the supplied water temperature by the bath heating unit W, normally, the hot water stored in the hot water storage tank unit Y is supplied to the bath 43 and the temperature of the hot water after that is maintained. It is used for so-called reheating, which raises the temperature to a predetermined temperature when it decreases. A hot water temperature sensor 47 for detecting the bath hot water temperature is attached to the water outgoing pipe 44.

On the other hand, the bathroom heating unit Z is installed on the ceiling of the bathroom 48, as shown in FIG. As shown in FIG. 4, this is because the bathroom heat exchanger 30 is provided in the casing 49.
And the blower fan 50 as well as the casing 49
A suction port 51 and a blowout port 52 are provided on the lower surface of the, and a bathroom temperature sensor 54 for detecting the temperature in the bathroom 48 is attached to the suction port 51. By operating the blower fan 50, the air in the bathroom 48 is sucked into the casing 49 from the suction port 51, and the bathroom heat exchanger.
It is blown out from the outlet 52 into the bathroom 48 through 30. At this time, by circulating the refrigerant that causes the bathroom heat exchanger 30 to act as a condenser, the heated air is blown into the bathroom 48, whereby the bathroom heating operation is performed. The bathroom heating unit Z also has a function of drying clothes after washing, which are suspended in the bathroom when the bathroom is not used,
For this reason, a ventilation fan 53 is further provided on the side wall surface of the casing 49 for performing ventilation for sequentially discharging air containing a large amount of water vaporized from clothes to the outside. In the following, the description will be limited to the case where the bathroom heating is performed by the bathroom heating unit Z.

The bath heat exchanger 29 and the bathroom heat exchanger 30 are connected in series as shown in FIG. 3, and when the refrigerant discharged from the compressor 1 is circulated in this path, The circulation pump 46 of the bath heating unit W is operated and the blower fan 50 in the bathroom heating unit Z is stopped to perform the bath heating operation. That is, when the blower fan 50 is in a stopped state, the heat is not exchanged in the bathroom heat exchanger 30, the refrigerant passes through it, and only the bath heat exchanger 29 functions as a condenser. On the other hand, when the circulation pump 46 is stopped and the blower fan 50 is operated, heat exchange in the bath heat exchanger 29 does not occur, the bathroom heat exchanger 30 functions as a condenser, and bathroom heating operation is performed. Will be seen. The bathtub heating operation and the bathroom heating operation are normally either selectively performed as described later.

In the above heat pump system, the refrigerant discharged from the compressor 1 is circulated from each indoor heat exchanger 28 to the outdoor heat exchanger 12 to heat the room, and from the outdoor heat exchanger 12 to each indoor heat exchanger 28. The refrigerant is circulated to cool the room. Further, during the heating operation, the discharge refrigerant from the compressor 1 is shunted and circulated to the bathtub / bathroom heating units W and Z sides, so that the bathtub heating or the bathroom heating operation can be simultaneously performed.

Further, by circulating the refrigerant discharged from the compressor 1 from the hot water supply heat exchanger 35 to the outdoor heat exchanger 12, the hot water heating operation for heating the hot water in the hot water storage tank 34 is performed, and the refrigerant discharged from the compressor 1 is also performed. Is supplied to the heat exchanger for hot water supply 35 and each of the indoor heat exchangers 28 in a branched manner, and then is circulated to the outdoor heat exchanger 12, whereby simultaneous heating and hot water supply operation are performed. Further, it is possible to carry out simultaneous operation of cooling and heating of hot water by circulating the hot water supply heat exchanger 35 to the indoor heat exchangers 28. In addition, the refrigerant discharged from the compressor 1 is circulated from the hot water supply heat exchanger 35 to the bath heat exchanger 30, and the bath heat exchanger 30 operates so as to function as an evaporator. It is also possible to perform an operation of collecting the exhaust heat of the hot water storage tank 34.

In each of the above operations, the indoor temperature, the hot water temperature in the hot water storage tank 35, etc. are respectively detected, and the operation is generated in each of the use side units A to C, Y, W, Z in which the detected temperature does not reach the set temperature. Depending on the combination of request signals, one of the above operating modes is selected, and the route corresponding to the selected operating mode is selected.
After the four-way switching valve 4 is switched and the first and second electromagnetic valves 6 and 36 and the first and second electric expansion valves 15 and 18 are controlled to be opened and closed, the compressor 1 is operated. . Hereinafter, for the sake of convenience, the control of the operation when the bathtub heating and the bathroom heating are independently performed will be described in detail.

FIG. 5 shows an operation control system diagram for controlling the operation of the bathtub heating / bathroom heating. As shown in FIG. 5, the outdoor unit X includes an outdoor control device (operation control means) 60, and The bathtub heating unit W includes a bathtub / bathroom control device 61, respectively. In the bathtub / bathroom control device 61, an operation request signal generation unit 62 and a device operation control unit (switch control means) 63
Is provided, and the operation request signal generation unit 62,
Hot water temperature detected by the hot water temperature sensor 47, and bathroom temperature sensor 54
In addition to the detected temperature being input, various setting signals from the driving remote controller 64 installed in the bathroom 48 and the like are also input. The operation remote controller 64 has a bathtub heating operation switch, a bathroom heating operation switch, a bathtub hot water temperature setting switch, a bathroom temperature setting switch, and the like. In the operation request signal generation unit 62, when the bath temperature heating operation switch is ON, when the hot water temperature detected by the hot water temperature sensor 47 is lower than the hot water temperature set by the hot water bath temperature setting switch, the outdoor Bath heating flag in data sent to controller 60
By setting Fw to 1, a bathtub heating operation request signal is output to the outdoor control device 60. At the same time, a temperature difference signal between the set hot water temperature and the detected hot water temperature is also output to the outdoor control device 60.
When the bathroom heating operation switch is ON,
When the temperature detected by the bathroom temperature sensor 54 is lower than the temperature set by the bathroom temperature setting switch, the bathroom heating flag Fz in the transmission data to the outdoor control device 60 is set to 1,
A bathroom heating operation request signal is output to the outdoor control device 60, and at the same time, a temperature difference signal between the set temperature and the detected temperature is also output.

On the other hand, in the outdoor control device 60, the compressor operation control unit 65
And a valve control unit 66 are provided, and the bathtub heating flag is provided.
When the Fw or the bathroom heating flag Fz changes from 0 to 1, the valve control unit 66 first shows a solid line in FIG. 3 for the four-way switching valve 4 to configure the refrigerant circulation path for heating the bathtub and heating the bathroom. Switching to the switching position, opening of the second electromagnetic expansion valve 18 of the first solenoid valve 6 and the fourth liquid branch pipe 22, and closing of the second solenoid valve 36 are performed. In addition, each second of the first to third liquid branch pipes 19 to 21
The electric expansion valves 18 and 18 have a predetermined stop opening (a small amount commensurate with natural heat dissipation in order to prevent liquid pooling in each indoor heat exchanger 28 during stoppage and liquid return to the compressor 1). The opening that allows the refrigerant to flow).

Then, in the compressor operation control unit 65, when the bathtub heating flag Fw is 1, the initial frequency preset in correspondence with the standard condensing capacity of the bath heat exchanger 29 and the bathroom heating flag Fz are set. When it is 1, the initial frequency for the standard condensing capacity of the bathroom heat exchanger 30 is selected, and the operation of the compressor 1 is started at this frequency. When both Fw and Fz are 1, the bath heat is prioritized over the bathroom heating, so the bath heat exchanger 29
Select an initial frequency for. After the operation of the compressor 1 is changed to the operation state at the initial frequency, the operation of the compressor 1 is continued while increasing or decreasing the frequency according to the change of the temperature difference input together with the operation request signals. To do. Also, in this operating state, the contents of Fw and Fz change,
When switching the operation mode between the bathtub heating and the bathroom heating, the control is performed to change the number of operating frequencies of the compressor 1 to the initial frequency in the new operating mode. During this period, the valve control unit 66 controls the degree of superheat of the first electric expansion valve 15. Further, the compressor operation control section 65 monitors a high pressure abnormality signal from the high pressure switch 7, and when this abnormality signal is generated, the compressor 1 is forcibly stopped.

Together with the controlled refrigerant circulation control as described above, the bath pump heating operation is performed by operating the circulation pump 46 of the bath heating unit W, and the bathroom heating operation is performed by operating the blower fan 50 of the bathroom heating unit Z. Although it is performed, the operation control of the circulation pump 46 and the blower fan 50 linked to such refrigerant circulation control is performed by the device operation control unit 63. Hereinafter, this device operation control unit 63 will be described. The control in step 6 will be described with reference to the control flowchart in FIG.

Step S1 of FIG. 6 is a step of initially setting 0 to the discrimination bit M for discriminating the time of switching to the bathroom heating operation immediately after the bathtub heating operation. Then in step S2,
It is determined whether or not the bathtub heating flag Fw is 1. Fw
If it is 1, the determination bit M is changed to 1 in step S3, and then the blower fan 50 is OF in step S4.
In step S5, the circulation pump 46 is turned on, and the process returns to step S2. Therefore, while Fw is 1, the blower fan 50 is kept in the stopped state and the circulation pump 46 is kept in the activated state, whereby the bath heat exchanger 29 is operated in the refrigerant circulation cycle controlled by the outdoor controller 60. The bathtub heating operation of heating the bathtub hot water is performed.

When the bath water temperature rises and reaches the set bath temperature by continuing the bath heating operation, the Fw is changed to 0 and the bath heating operation request signal is stopped. As a result, the process of shifting from step S2 to step S6 is performed, and in step S6, it is determined whether or not the bathroom heating flag Fz is 1. If Fz is 1, then the operation of the blower fan 50 is started in step S7. And the next step S8
At, it is determined whether or not the determination bit M is 1. If M is 1, that is, if the bath heating operation is switched to the bathroom heating operation following the end, then in step S9, the circulation pump delay timer tm starts counting, and the timer tm measures time. Until the set time t1 (for example, 60 seconds) is reached (step S10), the process of returning to step S2 via step S5 is performed. Therefore, during this time, the blower fan 50 and the circulation pump 46 are simultaneously operated, and the operation in which both the bath heat exchanger 29, the bathroom heat exchanger 29, and the bathroom heat exchanger 30 both function as a condenser is performed. Done.

After that, when the time measured by the timer tm reaches the set time t1, the process proceeds from step S10 to step S11, and the discrimination bit M is changed to 0 in this step, and then the step
In S12, the operation of the circulation pump 46 is stopped, and step S
Perform processing to return to 2. Therefore, thereafter, while the above Fz is 1, the process of steps S2, S6 to S8, and S12 is repeated, and therefore the operation of only the blower fan 50, that is, the bathroom heating that causes the bathroom heat exchanger 30 to function as a condenser. Operation is continued.

When the bathtub hot water temperature is lowered and the bathroom heating flag Fw is set to 1 again while continuing the above bathroom heating operation, steps S2 to S5 are repeated and the above bathtub heating operation is performed. It will be given priority. In addition, the bathroom temperature reaches the set temperature by continuing the above-mentioned bathroom heating operation, and Fw and Fz
If both and are 0, the process of stopping the blower fan 50 in steps S2 and S6 to step S13 and stopping the circulation pump 46 in step S14 and returning to step S1 is repeated to stop the operation. Maintained in a state. If only the bathroom heating operation request signal is newly generated from the stopped state of this operation, the process of shifting from step S2, S6 to S8 to step S12 is repeated, and only the blower fan 50 is started from the beginning. The activated bathroom heating operation is started.

The time chart of FIG. 7 shows an example of the above control result. As shown in the figure, when the bathtub heating flag Fw changes from 0 to 1, the compressor 1 and the circulation pump 46 are started. The bathtub heating operation is started. Even if the bathroom heating flag Fz changes to 1 while the Fw is 1, the bath heating operation is preferentially performed, and thus the blower fan 50 is maintained in the stopped state.

When the Fw changes to 0 (c), the Fw becomes 1
The switching to the bathroom heating operation corresponding to the above is performed, but this switching is performed at the switching time point c by the blower fan 50.
Is newly activated, and after a predetermined short time t1 (for example, 60 seconds) has elapsed from the switching time point c, the circulation pump 46 is stopped and the bathroom heating operation is started. FIG. 8 schematically shows a change in high pressure in the refrigerant piping system due to such control. The curve shown by the broken line in the figure shows the pressure change in the conventional example in which the circulation pump is stopped and the blower fan is started at the same time at the switching time point c. In this case, at the switching time point c, the outdoor control device is operated. The initial frequency corresponding to the standard condensing capacity of the bathroom heat exchanger 30 is set by the compressor 60, and the compression capacity changing control to gradually decrease to this frequency is started. Without waiting, the operation was switched to a mode in which only the bathroom heat exchanger 30 functions as a condenser at the switching time point c, so that an excessive amount of refrigerant is supplied to the condensing capacity.
As a result, there is a case where the high pressure is increased to reach the allowable upper limit pressure P1 and the compressor 1 is forcibly stopped. In this case, the stopped state of the compressor 1 is maintained, for example, for 3 minutes to wait for the pressure to drop, and then the bathroom heating operation is restarted.

On the other hand, in the above-described embodiment, the predetermined time is elapsed from the switching time point c.
During t1, the blower fan 50 and the circulation pump 46 are simultaneously operated, and the bath heat exchanger 29 and the bathroom heat exchanger 30 both function as a condenser. Therefore, as shown by the solid line in the figure, the high pressure is gradually reduced, together with the control for reducing the compression capacity of the compressor 1 to the initial frequency for the bathroom heat exchanger 30.
As a result, the compression capacity is commensurate with the condensation capacity of the bathroom heat exchanger 30 without causing an abnormal increase in pressure. After that, the circulation pump 46 is stopped to switch to the operation state of only the blower fan 50, and the bathroom heating operation state is entered without forcibly stopping the compressor 1. Therefore, according to the above-described embodiment, the abnormal stop due to the increase in the high pressure of the compressor 1 is eliminated, and the start / stop frequency is reduced, so that, for example, the durability performance of the compressor 1 is improved and the stop period of the compressor 1 is increased. By reducing the heating efficiency,
The heating capacity is improved.

The continuous operation time t ₁ of the circulation pump 46 (for example, 60 seconds)
Is the time required for the change in the compression capacity of the compressor 1 to change to an operating state substantially corresponding to the initial frequency for the bathroom heat exchanger 30, and during this time, the bath water is more than the set hot water temperature. It is set as the time during which the temperature is not raised.

Although the specific embodiments of the present invention have been described above, the embodiments are not intended to limit the present invention.
Various modifications can be made within the scope of the present invention.For example, in the above, the case where the condensation capacity in the bath heat exchanger 29 is larger than the condensation capacity in the bathroom heat exchanger 30 is taken as an example. However, if the condensing capacities are opposite, or if the combination of other heat exchangers with different condensing capacities such as heat exchangers exchanging heat with air or heat exchangers exchanging heat with hot water is used. It is possible to apply the present invention to
Further, in the above, the configuration of the heat exchangers 29, 30 connected in series to the outdoor heat exchanger 12 has been described as an example, but a configuration in which the utilization side heat exchangers are connected in parallel to the heat source side heat exchangers. Also in this, the present invention can be applied.

(Effects of the Invention) As described above, in the heat pump system of the present invention, a period during which the reduction of the condensation capacity does not occur is provided at the time of switching to the operating state in which the utilization side heat exchanger having a small condensation capacity functions as the condenser. During this time, the compressor is reduced to a compression capacity commensurate with the condensation capacity of the heat exchanger on the use side, which suppresses the pressure increase during switching and stops the operation due to high pressure abnormality as in the past. Frequency is reduced.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a schematic diagram showing an overall configuration of a heat pump system in an embodiment of the present invention, FIG. 3 is a refrigerant circuit diagram of the above device, and FIG. FIG. 5 is a perspective view showing the configuration of a bathroom heating unit, FIG. 5 is an operation control system diagram of a bathtub heating operation and a bathroom heating operation in the above apparatus, and FIG. 6 is a flowchart of control performed by an equipment operation control unit in the above apparatus, FIG. 7 is a time chart showing an example of the above control, and FIG. 8 is a graph showing an example of change in the high pressure as a result of the above control and an example of change in the high pressure in the conventional apparatus. 1 ... Compressor, 12 ... Outdoor heat exchanger (heat source side heat exchanger), 29 ... Bath heat exchanger (first heat exchanger), 30 ...
Heat exchanger for bathroom (second heat exchanger), 60 ... Outdoor control device (operation control means) 63 ... Device operation control section (switch control means), X ... Outdoor unit (heat source side unit), W ... …
Bathtub heating unit (first user side unit), Z ... Bathroom heating unit (second user side unit).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Mine 2 at 1000 Otani, Okamoto Town, Kusatsu City, Shiga Prefecture Daikin Industries, Ltd. Shiga Works

Claims (1)

[Claims] 1. A heat source side unit (X) having a compressor (1) with variable compression capacity and a heat source side heat exchanger (12), and a first utilization side unit (1) having a first heat exchanger (29). W) and a second utilization side unit (Z) having a second heat exchanger (30) having a smaller condensing capacity than the first heat exchanger (29) are connected to each other, and the first utilization side unit (Z) is connected. In accordance with the operation request signal from W), the compressor (1) is operated with a compression capacity corresponding to the condensation capacity of the first heat exchanger (29), and the refrigerant discharged from the compressor (1) is discharged. While flowing from the first heat exchanger (29) to the heat source side heat exchanger (12), the second heat exchanger (29)
In response to an operation request signal from the utilization side unit (Z), the compressor (1) is operated with a compression capacity corresponding to the condensation capacity of the second heat exchanger (30), From the second heat exchanger (30) to the heat source side heat exchanger (1
A heat pump system comprising an operation control means (60) for controlling the flow to the second heat exchanger (2), wherein the first heat exchanger (29) operates from a functioning state as a condenser to the second heat exchanger ( The first and second heat exchangers (29) when switching to an operating state in which 30) functions as a condenser
A switching control means (63) is provided for switching both of the (30) and the second heat exchanger (30) so that only the second heat exchanger (30) functions as a condenser after the both functions as a condenser for a predetermined time. Heat pump system.