JP2012141113A - Air conditioning/water heating device system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning/water heating device system including an indoor unit and a water heating unit, and capable of improving a capacity of the water heating unit.SOLUTION: An outdoor unit 100 has an outdoor heat exchanger 105 exchanging heat between a refrigerant and the air, and a compressor 101 connected to the outdoor heat exchanger 105 and compressing the refrigerant. The indoor unit 200 is connected to the outdoor heat exchanger 105 and the compressor 101 in series, and has an indoor heat exchanger 201 exchanging heat between the refrigerant and the air. The water heating unit 300 is connected to the indoor heat exchanger 201 in parallel and has a water-refrigerant heat exchanger 311 exchanging heat between the refrigerant and hot water/water. A control section controls the outdoor unit 100, the indoor unit 200 and the water heating unit 300 to control air-heating capacity of the indoor unit 200 and heating capacity of the water heating unit 300 applied to the hot water/water, and lowers the air-heating capacity of the indoor unit 200 when the heating capacity is lower than a prescribed value.

Description

  The present invention relates to an air-conditioning hot water apparatus system, and more particularly to control of the heating capacity of an indoor unit and the heating capacity of a hot water unit.

  Patent Document 1 discloses a system in which an air conditioner and floor heating share one outdoor unit. The problem in Patent Document 1 is that the resident feels that the wind blown from the indoor unit of the air conditioner hits the resident, and the draft of the fan of the indoor unit is silent and there is no draft feeling. The merit of floor heating is impaired.

  Therefore, in the technique described in Patent Document 1, control is performed to reduce the air volume of the indoor unit after the indoor temperature reaches a predetermined temperature.

  Patent Documents 2 and 3 are disclosed as techniques related to the present application.

JP 2005-55445 A JP 2000-46401 A JP 2006-38358 A JP 2005-16881 A

  If control is performed to reduce the air volume of the indoor unit when the room temperature rises to some extent as in Patent Document 1, the room temperature does not rise at a desired rate when the indoor air conditioning load is large, and the capacity is increased on the floor heating side. The floor temperature is difficult to increase without shifting from the machine.

  On the other hand, even if the room temperature is low, the higher the floor temperature, the more comfortable for the user.

  Then, an object of this invention is to provide the technique which can improve the capability of a warm water unit in an air conditioning warm water apparatus system provided with an indoor unit and a warm water unit.

  A first aspect of an air-conditioning hot water device system according to the present invention is an outdoor heat exchanger (105) in which heat is exchanged between a refrigerant and air, and is connected to the outdoor heat exchanger to compress the refrigerant. An outdoor unit (100) having a compressor (101), an indoor heat exchanger (201) connected in series with the outdoor heat exchanger and the compressor, and performing heat exchange between the refrigerant and air. An indoor unit (200) having, and a hot water unit (300) having a water-refrigerant heat exchanger (311) connected in parallel with the indoor heat exchanger and performing heat exchange between the refrigerant and hot water, When the outdoor unit, the indoor unit, and the hot water unit are controlled to control the heating capability of the indoor unit and the heating capability that the hot water unit gives to the hot water, and the heating capability is lower than a predetermined value , And a said control unit performs control to lower the heating capacity of the indoor units (150, 250, 350).

  A second aspect of the air-conditioning hot water apparatus system according to the present invention is the air-conditioning hot water apparatus system according to the first aspect, in which the indoor unit (200) sends air to the indoor heat exchanger (201). An indoor fan (202) for sending is provided, and the controller (250) reduces the heating speed by reducing the rotational speed of the indoor fan.

  A third aspect of the air-conditioning hot water device system according to the present invention is the air-conditioning hot water device system according to the first aspect, wherein the control unit (150, 250, 350) is provided by the indoor unit (200). The outdoor unit (100) and the indoor unit are controlled based on a set temperature in the room, and when the heating capacity is lower than the predetermined value, the set temperature is decreased to decrease the heating capacity.

  A fourth aspect of the air-conditioning hot water device system according to the present invention is the air-conditioning hot water device system according to any one of the first to third aspects, wherein the control unit (150, 250, 350) includes: When the rate of increase in the temperature of the hot water with respect to time is smaller than a second predetermined value, it is determined that the heating capacity is lower than the predetermined value.

  A fifth aspect of the air-conditioning hot water equipment system according to the present invention is the air-conditioning hot water equipment system according to any one of the first to third aspects, wherein the control unit (150, 250, 350) is configured as described above. When the temperature of the hot water after the elapse of a predetermined period from the start of supplying the refrigerant to the water-refrigerant heat exchanger (311) is smaller than a third predetermined value, the heating capacity is less than the predetermined value. Judged to be low.

  A sixth aspect of the air-conditioning hot water device system according to the present invention is the air-conditioning hot water device system according to any one of the first to third aspects, wherein the control unit (150, 250, 350) includes: When the condensation temperature of the refrigerant in the water-refrigerant heat exchanger (311) is smaller than a fourth predetermined value, it is determined that the heating capacity is lower than the predetermined value.

  A seventh aspect of the air-conditioning hot water equipment system according to the present invention is the air-conditioning hot water equipment system according to any one of the first to sixth aspects, wherein the control unit (150, 250, 350) is configured as described above. Whether or not the heating capacity is smaller than the predetermined value is determined at a plurality of time points, and if a positive determination is made at each time point, control is performed to reduce the heating capacity each time.

  An eighth aspect of the air-conditioning hot water apparatus system according to the present invention is the air-conditioning hot water apparatus system according to any one of the first to seventh aspects, wherein there are a plurality of the indoor units (200), A priority is assigned to at least one of the plurality of indoor units, a non-priority is assigned to at least one of the plurality of indoor units to which the priority is not assigned, and the control unit (150, 250, 350) reduces the heating capacity of the indoor units to which the non-priority is assigned when the heating capacity is lower than the predetermined value.

  According to the first aspect of the air-conditioning hot water device system of the present invention, the water-refrigerant heat exchanger has a lower condensing temperature for producing the same capacity than the indoor heat exchanger, so that large heating is performed on the indoor unit side. When the capacity is easily obtained, the heating capacity of the indoor unit is reduced when the heating capacity of the hot water unit is low. Accordingly, the heating capacity of the hot water unit is increased accordingly, and the temperature of the hot water can be increased. In other words, it is not necessary to increase the capacity of the outdoor unit in order to increase the heating capacity of the hot water unit. And since the conventional refrigerant circuit with which an indoor heat exchanger and a water-refrigerant heat exchanger are connected in parallel is employ | adopted, manufacturing cost can also be suppressed.

  According to the second aspect of the air-conditioning hot water device system of the present invention, the heating capability of the indoor unit is reduced by reducing the rotation speed of the indoor fan, so that the control is simple.

  According to the 3rd aspect of the air conditioning warm water equipment system concerning this invention, since the heating capability of an indoor unit is reduced by reducing preset temperature, control is easy.

  According to the 4th aspect of the air conditioning warm water apparatus system concerning this invention, since it is based on the output (temperature of warm water) of a warm water unit, a required capability can be given more directly.

  According to the fifth aspect of the air-conditioning hot water device system of the present invention, since the control is performed based on the temperature value after a lapse of a predetermined time, the process for calculating the increase rate is unnecessary and the process is simple. .

  According to the 6th aspect of the air conditioning warm water equipment system concerning this invention, compared with Claim 4, it is not necessary to calculate a raise rate, and a process is easy.

  According to the 7th aspect of the air conditioning warm water equipment system concerning this invention, it can adjust more finely.

  According to the 8th aspect of the air conditioning warm water apparatus system concerning this invention, the heating capability of a warm water unit can be improved, maintaining the heating capability of a preferred indoor unit.

It is an example of a notional composition of an air harmony warm water equipment system. It is an example of a notional composition of an air harmony warm water equipment system. It is an example of a notional structure of a control part. It is a figure which shows an example of the change with respect to the time of warm water. It is another example of the notional structure of a control part.

<Air-conditioning hot water equipment system>
As illustrated in FIG. 1, the air-conditioning hot water device system includes an outdoor unit 100, at least one indoor unit 200, and at least one hot water unit 300.

  In the illustration of FIG. 1, two indoor units 200 and one hot water unit 300 are provided. One indoor unit 200 and the outdoor unit 100 are connected to each other via a liquid refrigerant pipe 411 and a gas refrigerant pipe 421. The other indoor unit 200 and the outdoor unit 100 are connected to each other via a liquid refrigerant pipe 412 and a gas refrigerant pipe 422. The outdoor unit 100 and each indoor unit 200 can operate in conjunction with each other to adjust the air (for example, air convection, temperature, or humidity) in the room in which each indoor unit 200 is provided.

  The hot water unit 300 and the outdoor unit 100 are connected to each other via a liquid refrigerant pipe 413 and a gas refrigerant pipe 423. The outdoor unit 100 and the hot water unit 300 operate in conjunction with each other to warm hot water (including water). Here, the hot water unit 300 is used for floor heating, for example. In the illustration of FIG. 1, warm hot water is supplied to the floor heating panel 320 via the hot water pipe 43 to warm the indoor floor.

  In such an air-conditioning hot water apparatus system, an air conditioner (a set of the outdoor unit 100 and the indoor unit 200) and a hot water apparatus (a set of the outdoor unit 100 and the hot water unit 300) share one outdoor unit 100. Therefore, the scale and cost of the system can be reduced.

  With reference to FIG. 2, an example of a more detailed configuration of the air-conditioning hot water device system will be described. Each indoor unit 200 includes an indoor heat exchanger 201 and an indoor fan 202. A liquid refrigerant pipe 411 and a gas refrigerant pipe 421 are connected to both ends of the indoor heat exchanger 201 belonging to one indoor unit 200, respectively. A liquid refrigerant pipe 412 and a gas refrigerant pipe 422 are connected to both ends of the indoor heat exchanger 201 belonging to the other indoor unit 200, respectively. When the refrigerant flows through these indoor heat exchangers 201, heat exchange is performed between the refrigerant and the air. For example, the gaseous refrigerant flowing through the gas refrigerant pipe changes into a liquid state by radiating heat to the air in the indoor heat exchanger 201, and then flows through the liquid refrigerant pipe. As a result, heat is radiated to the air, and heating operation is performed. At this time, the indoor heat exchanger 201 functions as a condenser. When the refrigerant flows in the reverse direction, the refrigerant absorbs heat from the air in the indoor heat exchanger 201, and the cooling operation is performed. At this time, the indoor heat exchanger 201 functions as an evaporator.

  The indoor fan 202 sends air to the indoor heat exchanger 201 and blows out the heat-exchanged air into the room. Thereby, warm air or cold air is supplied indoors. Even when the refrigerant does not flow through the indoor heat exchanger 201, the indoor air can be simply circulated by rotating the indoor fan 202.

  The hot water unit 300 includes a water-refrigerant heat exchanger 311 and a circulation pump 313.

  A liquid refrigerant pipe 413 and a gas refrigerant pipe 423 are connected to both ends of the water-refrigerant heat exchanger 311, respectively. A hot water pipe 43 is also connected to the water-refrigerant heat exchanger 311. In the water-refrigerant heat exchanger 311, heat exchange is performed between the refrigerant and hot water (including water). More specifically, the refrigerant in the gaseous state flows from the gas refrigerant pipe 423 to the water-refrigerant heat exchanger 311. In the water-refrigerant heat exchanger 311, the refrigerant radiates heat to the hot water flowing from the hot water pipe 43. That is, the water-refrigerant heat exchanger 311 functions as a condenser. Then, due to the heat dissipation, the refrigerant changes to a liquid state and flows through the liquid refrigerant pipe 413. Hot water is warmed by such heat radiation.

  The warm hot water is supplied to the tank 312, for example. The tank 312 is an expansion tank, for example, and is provided in the hot water pipe 43 to absorb the volume expansion of hot water caused by the temperature rise. For example, the circulation pump 313 is provided in the hot water pipe 43 on the outlet side of the tank 312 to circulate hot water. In the example of FIG. 2, a forward header 314 and a return header 316 are provided in the hot water pipe 43. The forward header 314 is a component for branching the hot water pipe 43 into a plurality of hot water pipes. In the example of FIG. 2, the forward header 314 is provided on the output side of the circulation pump 313 and branches one hot water pipe into four hot water pipes. Each of the four hot water pipes is provided with a thermal valve 315. The thermal valves 315 control the opening and closing of the hot water piping.

  In the illustration of FIG. 2, two of the four hot water pipes pass through the two floor heating panels 320. At this time, the hot water dissipates heat to the floor and warms the floor. The connection destinations of the remaining two hot water pipes are not shown, but may be used for devices such as a panel radiator, for example. These four hot water pipes are connected to the return header 316. The return header 316 is a component for joining a plurality of hot water pipes into one hot water pipe. In the illustration of FIG. 2, two hot water pipes passing through the floor and the other two hot water pipes are joined to one hot water pipe 43 by the return header 316. Then, for example, hot water cooled by the floor heating panel 320 or the panel radiator is supplied again to the water-refrigerant heat exchanger 311 and warmed.

  In the illustration of FIG. 2, a drain plug 317 is provided between the return header 316 and the water-refrigerant heat exchanger 311. Thereby, the hot water which became old can be discharged | emitted. For example, new hot water may be supplied to the hot water pipe 43 from the supply port via the tank 312 provided in the tank 312.

  The outdoor unit 100 functions as a heat source for the indoor unit 200 and the hot water unit 300. The outdoor unit 100 includes a compressor 101, a four-way valve 104, an outdoor heat exchanger 105, an outdoor fan 106, and a plurality of expansion valves 107.

  The compressor 101 and the four-way valve 104 are provided in the gas refrigerant pipe 42. The compressor 101 compresses the low-pressure refrigerant sucked from the suction port, and discharges the compressed high-pressure refrigerant from the discharge port. In the example of FIG. 2, an accumulator 102 is provided on the suction port side of the compressor 101. The accumulator 102 can store excess refrigerant. In the illustration of FIG. 2, a muffler 103 is provided on the discharge side of the compressor 101. The muffler 103 can suppress pulsation generated in the refrigerant flow. A four-way valve 104 is provided on the output side of the muffler 103 and the input side of the accumulator 102. The four-way valve 104 has a first state (state of FIG. 2) in which the discharge port of the compressor 101 is connected to the gas refrigerant pipes 421 to 423, and the suction port is connected to the outdoor heat exchanger 105, respectively. It connects with the outdoor heat exchanger 105, and switches the 2nd state which connected the inlet to the gas refrigerant piping 421-423. The gas refrigerant pipes 421 to 423 merge with the gas refrigerant pipe 42, and the gas refrigerant pipe 42 is connected to the four-way valve 104.

  A gas refrigerant pipe 42 and a liquid refrigerant pipe 41 are connected to both ends of the outdoor heat exchanger 105, respectively. Heat exchange is performed between the refrigerant and the air inside the outdoor heat exchanger 105. For example, the gaseous refrigerant flowing through the gas refrigerant pipe 42 is changed to a liquid state by radiating heat to the air in the outdoor heat exchanger 105, and then flows through the liquid refrigerant pipe 41. At this time, the outdoor heat exchanger 105 functions as a condenser. On the other hand, when the refrigerant flows in the reverse direction, the refrigerant absorbs heat from the air in the outdoor heat exchanger 105. At this time, the outdoor heat exchanger 105 functions as an evaporator. The liquid refrigerant pipe 41 branches into liquid refrigerant pipes 411 to 413.

  The expansion valves 107 are provided in the liquid refrigerant pipes 411 to 413, respectively. The expansion valve 107 squeezes and expands the refrigerant, for example. Moreover, in the illustration of FIG. 2, the filter 108 is provided in each of liquid refrigerant piping 411-413. The filter 108 can remove ice contained in the refrigerant, for example.

  In the illustration of FIG. 2, a liquid closing valve 109 is provided in each of the liquid refrigerant pipes 411 to 413, and a gas closing valve 110 is provided in each of the gas refrigerant pipes 421 to 423. The liquid closing valve 109 and the gas closing valve 110 respectively control the opening and closing of the piping. For example, when one indoor unit 200 is not operated, control for closing the liquid closing valve 109 provided in the liquid refrigerant pipe 411 and the gas closing valve 110 provided in the gas refrigerant pipe 421 may be executed.

  In this air-conditioned hot water equipment system, when attention is paid to the connection mode of one of the indoor heat exchanger 201, the compressor 101, and the outdoor heat exchanger 105, these are connected in series with each other. On the other hand, paying attention to the connection mode of the water-refrigerant heat exchanger 311, the compressor 101, and the outdoor heat exchanger 105, these are connected in series with each other. When attention is paid to the connection mode between one of the indoor heat exchangers 201 and the water-refrigerant heat exchanger 311, they are connected in parallel to each other. Such a structure has been used conventionally, and no dedicated member is required to realize the air-conditioning hot water apparatus system according to the present embodiment. Therefore, an increase in manufacturing cost can be suppressed.

  Next, in the air-conditioning hot water device system, the flow of the refrigerant when performing the heating operation in each indoor unit 200 and performing the floor heating operation in the hot water unit 300 will be described. The four-way valve 104 adopts the first state (the state shown in FIG. 2). The compressor 101 compresses the refrigerant and supplies the compressed refrigerant to the indoor heat exchanger 201 and the water-refrigerant heat exchanger 311. The refrigerant dissipates heat in the indoor heat exchanger 201 and the water-refrigerant heat exchanger 311 and changes to a liquid refrigerant. Thereafter, the refrigerant is throttled and expanded by the expansion valve 107 and flows to the outdoor heat exchanger 105, and the outdoor heat exchanger 105 absorbs heat and changes to a gaseous refrigerant. This gaseous refrigerant is compressed again by the compressor 101 and circulates in the above-described path.

  Here, when the indoor unit 200 or the hot water unit 300 performs the heating operation, the other indoor units 200 do not perform the cooling operation and the dehumidifying operation. When the indoor unit 200 performs the cooling operation or the dehumidifying operation, the four-way valve 104 is switched to the first state, the expansion valves 107 corresponding to the other indoor units and the hot water unit being stopped are closed, and the refrigerant flow Shut off.

  Now, an indoor unit 200 and a hot water unit 300 connected to different outdoor units are assumed. If the heating capability exhibited by the indoor unit 200 and the heating capability (heating capability given to hot water) exhibited by the hot water unit 300 are to be made the same, the condensation temperature of the refrigerant in the indoor heat exchanger 201 is set to water-refrigerant heat. It is necessary to control the temperature lower than the condensation temperature of the refrigerant in the exchanger 311. Such control is realized, for example, by making the pressure of the refrigerant supplied to the indoor heat exchanger 201 lower than the pressure of the refrigerant supplied to the water-refrigerant heat exchanger 311. At this time, the condensation temperature of the refrigerant in the indoor heat exchanger 201 is, for example, about 40 degrees Celsius, and the water-refrigerant heat exchanger 311 is, for example, about 50 degrees Celsius. The difference in the condensation temperature is due to the following reason, for example. In other words, the heat exchange between the refrigerant and water is less efficient than the heat exchange between the refrigerant and air, and the air after the heat exchange is directly supplied into the room for heating operation. The subsequent hot water is exchanged again with the floor panel, and the floor heating operation is performed. Furthermore, the heat exchange of hot water in the floor panel is not very efficient.

  However, in the present air-conditioning hot water apparatus system sharing one outdoor unit 100, the refrigerant condensation temperatures in the indoor heat exchanger 201 and the water-refrigerant heat exchanger 311 are substantially equal. Therefore, the heating capability exhibited by the indoor unit 200 tends to be higher than the heating capability exhibited by the hot water unit 300. Therefore, for example, when the operation of the indoor unit 200 and the hot water unit 300 is started at the same time in the air-conditioning hot water device system, the heating capacity output from the indoor unit 200 is large and the temperature of the hot water is difficult to rise. Since floor heating has better heating comfort for residents than air conditioners, it is desirable to preferentially perform floor heating. In view of this point, the present air-conditioning hot water unit performs control to be described later by a control unit exemplified below.

<Control unit>
The outdoor unit 100, the indoor unit 200, and the hot water unit 300 each include a control unit, and these control units communicate with each other. FIG. 3 exemplifies a connection relationship of each control unit related to communication. For example, the control unit 150 is provided in the outdoor unit 100, each control unit 250 is provided in each indoor unit 200, and the control unit 350 is provided in the hot water unit 300. The control units 150, 250, and 350 have communication units 151, 251 and 351, respectively. These are connected so that they can communicate with each other by wire or wireless. In the example of FIG. 2, the control units 150, 250, and 350 are connected to each other by a daisy chain. Thereby, when a new indoor unit or a hot water unit can be provided, the connection of a new control part can be made easy.

  The control unit 150 controls each driving element (the compressor 101, the four-way valve 104, the outdoor fan 106, the expansion valve 107, and the closing valves 109 and 110) provided in the outdoor unit 100. The control unit 250 controls a driving element (indoor fan 202) provided in the indoor unit 200. The control unit 350 controls each drive element (circulation pump 313, thermal valve 315) provided in the hot water unit 300.

  For example, remote controllers 260 and 360 are connected to the control units 250 and 350, respectively. For example, the remote controller 260 is provided with an input unit for inputting operation start / stop switching, cooling / heating / dehumidification / air blowing switching, and indoor temperature setting. The remote controller 360 is provided with, for example, an input unit for switching operation start / stop, and setting a high / low setting of the hot water temperature (floor heating temperature).

  These input units are operated by the user. Information corresponding to the operation is transmitted to the control units 250 and 350 by the operation of the input unit. The control units 250 and 350 transmit this to the control unit 150. The control unit 150 controls each component of the outdoor unit 100 based on the received information and transmits a control signal to the indoor unit 200 and the hot water unit 300. The control unit 250 controls the indoor fan 202 according to the control signal, and the control unit 350 controls each component of the hot water unit 300 according to the control signal. By such control, the above-described air conditioning operation and floor heating operation are executed.

  The controller 150 can monitor the heating capacity of the hot water unit. In the illustration of FIG. 2, the hot water unit 300 is provided with a return water temperature sensor 318 that measures the temperature of hot water flowing through the hot water pipe 43. As a more detailed example, the return water temperature sensor 318 is provided in the hot water pipe 43 on the downstream side of the refrigerant from the floor heating panel 320 and measures the temperature of hot water flowing through the hot water pipe 43. Since there is a positive correlation between the heating capacity exhibited by the hot water unit and the rate of increase in the temperature of the hot water with respect to time, the heating capacity of the hot water unit can be grasped based on the temperature of the hot water.

  And when the heating capability of the hot water unit 300 falls below a predetermined value, the control unit 150 reduces the heating capability of the indoor unit 200. In addition, when a heating capability corresponds with a predetermined value, you may employ | adopt any of a branch. That is, in this case, the heating capacity may or may not be reduced. This is the same for other controls performed based on the magnitude relationship between the comparison value (in the above example, the heating capacity) and the predetermined value, and repeated description will be omitted.

  Hereinafter, a more detailed example will be described. The detected temperature detected by the return water temperature sensor 318 is output to the control unit 350. The control unit 350 transmits the detected temperature to the control unit 150. For example, referring to FIG. 4, control unit 150 uses the temperature T1 of hot water at time t2 and the temperature T2 of hot water at time t3 to increase the temperature of warm water between times t2 and t3 (= (T2 -T1) / (t3-t2)) is calculated. FIG. 4 shows the change of the temperature of the hot water with respect to time when the capacity of the hot water unit 300 is high and low. In the illustration of FIG. 4, a change in temperature when a sufficient capability is exhibited is represented by a broken line. In the illustration of FIG. 4, the hot water unit 300 starts operation at time t1, and the temperature of the hot water rises with time after time t1. As can be understood from the illustration of FIG. 4, if the heating capacity exhibited by the hot water unit 300 is insufficient, the time until the temperature of the hot water reaches the target value T * is long.

  Now, when the calculated increase rate falls below the reference value (in other words, when the heating capacity of the hot water unit 300 falls below a predetermined value), the controller 150 heats at least one indoor unit 200 by, for example, the following method. Reduce ability. The control unit 150 transmits a control signal for reducing the heating capacity of the indoor unit 200 to the control unit 250. The control unit 250 that has received the control signal reduces the rotational speed of the indoor fan 202, for example. Thereby, the heating capability of the indoor unit 200 can be reduced. Along with this, the heating capacity of the hot water unit 300 increases. The reason for this is simply as follows. This is because the capacity of the outdoor unit 100 is the sum of the capacity of the indoor unit 200 and the hot water unit 300, but the capacity of the outdoor unit 100 is hardly changed. Therefore, the capability of the hot water unit 300 increases as the capability of the indoor unit 200 decreases. That is, the rate of increase in the temperature of hot water on the outlet side of the water-refrigerant heat exchanger 311 increases.

  As described above, in the indoor unit 200 and the hot water unit 300 connected to the common outdoor unit 100, the capacity of the indoor unit 200 is likely to be larger than that of the hot water unit 300. For example, the capacity of the hot water unit 300 can be increased with priority. In other words, it is not necessary to increase the capacity of the outdoor unit 100 in order to increase the heating capacity of the hot water unit 300.

  Moreover, if the heating capability of the indoor unit is reduced by reducing the rotation speed of the indoor fan, the heating capability of the indoor unit can be reduced by simple control.

  Further, if the heating capacity is monitored based on the rate of increase in the temperature of hot water, the heating capacity is based on the output (warm water temperature) of the hot water unit 300, so that it can be monitored with high accuracy and more directly required. Heating capacity can be realized.

  Note that it is not necessary for the controller 150 to determine whether the heating capacity of the hot water unit 300 is lower than the predetermined value, and may be determined by the controller 250 or 350. Since this point can be applied to other modes described later, repeated description is avoided.

<Control for reducing the capacity of the indoor unit 200>
The controller 150 may decrease the set temperature for the indoor unit 200 when the heating capacity of the hot water unit 300 is below a predetermined value. The indoor unit 200 is provided with, for example, a room temperature sensor 203 that detects the room temperature. For example, the control units 150 and 250 control the outdoor unit 100 and the indoor unit 200 so that the detected room temperature approaches the set temperature. As described above, when the set temperature is lowered, the amount of heat given to the room is lowered, so that the heating capacity of the indoor unit 200 can be lowered. Such a decrease in the set temperature can be realized, for example, by controlling the rotation speed of the indoor fan 202 and / or the expansion valve 107 provided in, for example, a liquid refrigerant pipe connected to the indoor unit 201. As the capacity of the indoor unit 200 decreases, the capacity of the hot water unit 300 increases. According to such control, since the heating capacity of the indoor unit is reduced by lowering the set temperature, the control is simple.

<Monitoring the capacity of the hot water unit 300>
For example, the control unit 150 may determine that the heating capacity of the hot water unit 300 is below a predetermined value as follows. That is, referring to FIG. 4, at time t4 after a predetermined period has elapsed from time t1 when operation of hot water unit 300 is started, heating of hot water unit 300 is caused by the temperature of the hot water being lower than reference value Tref. It is determined that the ability falls below a predetermined value. According to this, since it is not necessary to calculate the rate of increase in the temperature of the hot water, the processing is easy.

  Further, the heating capacity of the hot water unit 300 does not need to be monitored by detecting the temperature of the hot water. For example, there is a positive correlation between the condensation temperature of the refrigerant flowing through the water-refrigerant heat exchanger 311 and the heating capacity of the hot water unit 300. Therefore, the heating capability of the hot water unit 300 may be monitored using the condensation temperature of the refrigerant. In the illustration of FIG. 2, a water-cold heat exchange temperature sensor 319 for detecting an intermediate temperature of the refrigerant flowing through the water-refrigerant heat exchanger 311 is provided. Since the intermediate temperature of the refrigerant can be regarded as the condensation temperature of the refrigerant, the heating capacity of the hot water unit 300 can be monitored based on the temperature detected by the water-cold heat exchange temperature sensor 319. More specifically, when the refrigerant condensing temperature is lower than a predetermined value, it is determined that the heating capacity of the hot water unit 300 is lower than the predetermined value. According to this, it is not necessary to calculate the rate of increase in the temperature of hot water, and processing is easy.

  The water-cold heat exchange temperature sensor 319 can be used for the next control, for example, together with the liquid pipe temperature sensor 111. The liquid pipe temperature sensor 111 is provided between the expansion valve 107 and the water-refrigerant heat exchanger 311 and detects the temperature of the refrigerant flowing through the liquid refrigerant pipe 413. The detected temperature is input to the control unit 150, for example. The control unit 150 calculates the difference between the condensation temperature from the water-cooling heat exchange temperature sensor 319 and the temperature from the liquid tube temperature sensor 111 to obtain the degree of supercooling of the refrigerant. Moreover, the target supercooling degree is input to the control unit 150 or calculated from other parameters (for example, the target temperature of hot water), and the control units 150 and 350 are based on the deviation between the supercooling degree and the target supercooling degree. The outdoor unit 100 and the hot water unit 300 are controlled. If such a control method is adopted, an existing temperature sensor can be adopted as the water-cooling heat exchange temperature sensor 319. Therefore, the manufacturing cost is not increased.

  Further, the control unit 150 determines whether or not the heating capacity of the hot water unit 300 is smaller than a predetermined value at a plurality of time points, and if a positive determination is made at each time point, the heating capacity of the indoor unit 200 is determined each time. You may perform control which reduces. For example, referring to FIG. 4, in each of the first period including time t2, the second period including time t3, which is different from the first period, and the third period different from the first and second periods, The heating capacity of the hot water unit 300 is monitored. Then, the heating capacity of the indoor unit 200 may be reduced when the heating capacity falls below a predetermined value in each of the first to third periods. As a result, finer adjustments can be made.

<Priority / non-priority settings>
When a plurality of indoor units 200 are provided as illustrated in FIG. 2, priority may be set for each of these units. For example, “priority” is set as the priority for one indoor unit 200, and “non-priority” is set as the priority for the other indoor unit 200. Such setting is set by the user from the remote controller 260, for example. For example, as illustrated in FIG. 5, the remote controller 260 is provided with an input unit 261 that inputs priority to each indoor unit 200. Then, for example, setting information about priority from the remote controller 260 is transmitted to the control unit 150 via the control unit 250, and the control unit 150 records the setting information on the recording medium 152 belonging to itself. The priority is not necessarily recorded on the recording medium 152, and may be recorded on a recording medium belonging to the control unit 250 or the control unit 350.

  When the heating capacity of the hot water unit 300 falls below a predetermined value, the control units 150 and 250 decrease the heating capacity of the indoor unit 200 set to “non-priority” as the priority. Thereby, while improving the heating capability of the hot water unit 300, the fall of the heating capability of the indoor unit 200 with a high priority can be avoided. In other words, the heating capacity of the hot water unit 300 can be improved while maintaining the heating capacity of the indoor unit 200 that is prioritized.

  When three or more indoor units 200 are provided, for example, two of them may be set as “priority” and the remaining one may be set as “non-priority”, or one may be set as “priority”. The remaining two units may be set to “non-priority”. That is, the number of units to which “priority” is allocated and the number of units to which “non-priority” is allocated are arbitrary. Alternatively, a plurality of priorities may be assigned to a plurality of indoor units 200, respectively, and the heating capacity may be decreased sequentially from the indoor units 200 having a lower priority. And if the heating capability of the hot water unit 300 reaches a sufficient value, the heating capability of the indoor unit 200 having a higher priority is not lowered. Thereby, the heating capability of the hot water unit 300 can be increased while suppressing a decrease in the capability of the indoor unit 200 having a relatively high priority.

  Moreover, “priority” (or higher priority) may be set as the priority for the indoor unit 200 provided in the same room as the room where the floor heating panel 320 is provided. The room in which the floor heating panel 320 is provided is used more frequently by the user than other rooms. According to this control, it is possible to perform the heating operation and the floor heating operation with a relatively high capacity in a room that is frequently used.

  The priority setting may be realized by, for example, a user input as described above, or may be realized as follows, for example. That is, the room in which the indoor unit 200 and the hot water unit 300 are provided is stored in the control unit 150, for example. For example, the control unit 150 records the identification numbers (for example, communication addresses) of the indoor unit 200 and the hot water unit 300 in association with the numbers that distinguish the room. This information may be input by the user (or worker) operating the remote controller 360, for example. For example, the control unit 150 sets “priority” (or higher priority) as the priority for the indoor unit 200 provided in the same room as the hot water unit 300.

DESCRIPTION OF SYMBOLS 100 Outdoor unit 101 Compressor 105 Outdoor heat exchanger 150,250,350 Control part 200 Indoor unit 201 Indoor heat exchanger 202 Indoor fan 300 Hot water unit 311 Water-refrigerant heat exchanger

Claims (8)

An outdoor unit (100) having an outdoor heat exchanger (105) in which heat is exchanged between the refrigerant and air, and a compressor (101) connected to the outdoor heat exchanger and compressing the refrigerant;
An indoor unit (200) having an indoor heat exchanger (201) connected in series with the outdoor heat exchanger and the compressor and performing heat exchange between the refrigerant and air;
A hot water unit (300) having a water-refrigerant heat exchanger (311) connected in parallel with the indoor heat exchanger and performing heat exchange between the refrigerant and hot water;
When the outdoor unit, the indoor unit, and the hot water unit are controlled to control the heating capability of the indoor unit and the heating capability that the hot water unit gives to the hot water, and the heating capability is lower than a predetermined value, An air-conditioning hot water apparatus system comprising a control unit (150, 250, 350) that performs control to reduce the heating capacity of the unit.   The indoor unit (200) includes an indoor fan (202) that sends air to the indoor heat exchanger (201), and the control unit (250) reduces the rotation speed of the indoor fan to reduce the heating capacity. The air-conditioning hot water apparatus system according to claim 1, wherein   The control unit (150, 250, 350) controls the outdoor unit (100) and the indoor unit based on a set temperature in a room where the indoor unit (200) is provided, and the heating capacity is higher than the predetermined value. The air-conditioning hot water apparatus system according to claim 1, wherein when the temperature is low, the set temperature is lowered to lower the heating capacity.   The said control part (150, 250, 350) judges that the said heating capability is lower than the said predetermined value, when the raise ratio with respect to the time of the said hot water with respect to time is smaller than a 2nd predetermined value. 4. The air-conditioning hot water device system according to any one of 3.   The controller (150, 250, 350) has the temperature of the hot water smaller than a third predetermined value after a predetermined period of time has passed since the refrigerant started to be supplied to the water-refrigerant heat exchanger (311). 4. The air-conditioning hot water apparatus system according to claim 1, wherein the heating capacity is determined to be lower than the predetermined value.   When the condensing temperature of the refrigerant in the water-refrigerant heat exchanger (311) is lower than a fourth predetermined value, the controller (150, 250, 350) is configured such that the heating capacity is lower than the predetermined value. The air-conditioning hot water apparatus system according to any one of claims 1 to 3, wherein the determination is performed.   The control unit (150, 250, 350) determines whether the heating capacity is smaller than the predetermined value at a plurality of time points, and if a positive determination is made at each time point, the heating unit is performed each time. The air-conditioning hot water apparatus system according to any one of claims 1 to 6, wherein control for reducing the capacity is performed. There are a plurality of indoor units (200),
A priority is assigned to at least one of the plurality of indoor units, and a non-priority is assigned to at least one of the plurality of indoor units to which the priority is not assigned,
The control unit (150, 250, 350), when the heating capacity is lower than the predetermined value, reduces the heating capacity of the indoor unit to which the non-priority is assigned. The air-conditioning hot water equipment system according to any one of the above.

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