JPH0578734B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an operation control device for a regenerative air conditioner equipped with a heat storage tank, and particularly relates to measures for improving the utilization efficiency of stored heat. (Prior Art) Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 59-208367, a refrigerant circuit including a compressor, an outdoor heat exchanger, a pressure reduction mechanism, and an indoor heat exchanger is provided,
A bypass path for temporarily bypassing the refrigerant circuit is provided in the liquid pipe between the outdoor heat exchanger and the indoor heat exchanger, and a heat exchange coil of the heat storage tank is interposed in the bypass path. A heat exchange coil is placed in series with the heat exchanger, and when the device is in heating operation, the heat exchange coil is used as an evaporator when the heating load is large, and the heat exchange coil is used as an evaporator when the heating load is small. There are known devices that attempt to reduce power consumption by using them as condensers. Furthermore, as disclosed in JP-A-61-125555, for example, a heat exchange coil of a heat storage tank is interposed in a bypass pipe that bypasses between a liquid pipe and a gas pipe in a refrigerant circuit similar to the above, that is, an outdoor By arranging a heat exchange coil in parallel with the heat exchanger and the indoor heat exchanger, for example, during heating operation, the refrigerant condensed in the indoor heat exchanger is directly evaporated in the heat exchange coil to utilize heat storage. There are also known devices that attempt to obtain high heating capacity. (Problems to be Solved by the Invention) By the way, in the former of the above-mentioned conventional devices, since the heat storage coil is arranged in series with the outdoor heat exchanger and the indoor heat exchanger, the indoor heat exchange is not performed during heating operation. Condensation occurs through heat exchange between the refrigerant that has been condensed in the refrigerant and the heat storage medium, and the condensation effect is small. Therefore, if you want to increase the effect of reducing power consumption by storing a large amount of warm heat with the heat storage medium in the heat storage tank, as in the latter case,
It is desirable to arrange the heat exchange coil in parallel with the outdoor heat exchanger and the indoor heat exchanger. However, during heat storage recovery operation to recover heat stored in the heat storage tank, the evaporation capacity of the heat storage coil may become lower than the evaporation capacity of the outdoor heat exchanger, such as when the evaporation capacity decreases due to a decrease in the amount of heat storage. In such a case, the heating capacity of the indoor heat exchanger will be insufficient, and if the heat storage and recovery operation is continued as it is, there is a risk that the feeling of air conditioning will be impaired. The present invention has been made in view of these points, and its purpose is to utilize heat storage advantageously by taking a means to determine which heating capacity is higher between heat storage recovery operation and normal heating operation. The purpose is to improve the utilization rate. (Means for solving the problem) In order to achieve the above object, the solving means of the present invention is as follows:
As shown in Fig. 1, a compressor 1, an outdoor heat exchanger 3
A refrigerant circuit 1 formed by connecting an indoor heat exchanger 6 and
0, and a heat storage tank 1 containing a heat storage medium capable of storing heat and heat.
2, and the liquid pipe 8c and gas pipe 8d of the refrigerant circuit 10.
A heat exchange coil 13 is installed in a bypass path 16 between the heat storage tank 12 and the refrigerant, and a heat exchange coil 13 is provided to exchange heat between the heat storage medium of the heat storage tank 12 and the refrigerant. The present invention is based on a regenerative air conditioner equipped with pressure reducing mechanisms 4 and 17 that reduce the pressure. As an operation control device for the air conditioner, during heating operation, the circulation of the refrigerant is controlled by the indoor heat exchanger 6.
The refrigerant condensed in the outdoor heat exchanger 3 is circulated so that it evaporates, and the refrigerant condensed in the indoor heat exchanger 6 is circulated so that it evaporates in the heat exchange coil 13 of the bypass path 16. a connection switching mechanism 51 that selectively switches to a heat storage recovery heating operation route; and a preliminary operation that operates the connection switching mechanism 51 to control the normal heating operation after performing the heat storage recovery operation for a predetermined time. A control means 52 and a heating capacity detection means for detecting the heating capacity when the outdoor heat exchanger 3 and the heat exchange coil 13 are used as an evaporator during operation by the preliminary operation control means 52.
P ₁ , a required capacity detection means Th1 that detects the required indoor heating capacity based on the room temperature, and receives the outputs of the required capacity detection means Th1 and the heating capacity detection means _P1 , and determines the required heating capacity and the outdoor heat exchanger 2. a comparison means 53 for comparing the heating capacity when the heat exchange coil 13 is used as an evaporator and the heating capacity when the heat exchange coil 13 is used as an evaporator; When the heating capacity and the required heating capacity are both greater than the heating capacity when the outdoor heat exchanger 3 is used as an evaporator, the heat storage recovery heating operation is performed, and at other times, the normal heating operation is performed. and an operation control means 54 for controlling the operation of the connection switching mechanism 51. Furthermore, as shown in FIG. 2, the second solution is based on the same air conditioner as the first solution, and uses the same connection switching device as the first solution as its operation control device. a mechanism 51, a room temperature detection means Th1 for detecting the indoor air temperature, an outside temperature detection means Th2 for detecting the temperature of the outdoor air, a heat storage temperature detection means Th3 for detecting the temperature of the heat storage medium in the heat storage tank 12, A first storage means 23 that stores the normal heating operation capacity using outdoor air temperature and indoor air temperature as parameters, and a second storage means 24 that stores the heat storage recovery heating ability that uses the heat storage medium temperature and indoor air temperature as parameters. , a third storage means 25 for storing the required load for heating using the indoor air temperature and the set temperature as parameters, and each of the above-mentioned detection means Th1,
A calculation means 55 receives the outputs of Th2 and Th3 and calculates the normal heating capacity, heat storage recovery heating capacity, and required load from the stored contents of the storage means 23, 24, and 25 at the corresponding temperature, and calculates the output of the calculation means 55. and a comparison means 53 for comparing the magnitudes of normal heating capacity, heat storage recovery heating capacity, and required load; An operation control means 54 is provided for controlling the operation of the connection switching mechanism 51 so that the recovery heating operation is performed and the normal heating operation is performed at other times. (Function) With the above configuration, in the invention of claim 1, the operation of the connection switching mechanism 51 is controlled by the preliminary operation control means 52, the refrigerant is condensed in the indoor heat exchanger 6, and the heat exchange coil of the bypass path 16 is After a heat storage recovery heating operation in which the refrigerant is circulated so as to evaporate in the indoor heat exchanger 6 is performed for a predetermined time, a normal heating operation is performed in which the refrigerant condensed in the indoor heat exchanger 6 is circulated in the outdoor heat exchanger 3 so as to be evaporated. At that time, heating capacity detection means
Outdoor heat exchanger 3 and heat exchange coil 1 by P ₁
3 is used, and the required heating capacity is detected by the required capacity detection means Th1.
Then, the comparison means 53 compares their sizes, and the operation control means 54 determines when the heating capacity when using the outdoor heat exchanger 3 is greater than the heating capacity when using the heat exchange coil 13, and when the outdoor Heating capacity when heat exchanger 3 is used is heat exchange coil 1
Even if the heating capacity is smaller than when the heating capacity is used, normal heating operation is performed when the required heating capacity is exceeded, so that heat storage is saved in case it is necessary. On the other hand, when the heating capacity when using the first coil 13 is larger than the heating capacity when using the outdoor heat exchanger 3, the heat storage recovery heating operation is performed, so that the feeling of air conditioning is not impaired. Therefore, heat storage can be used advantageously while maintaining the necessary air conditioning effect.
This will improve its utilization efficiency. In the invention of claim 2, the calculation means 55 receives the outputs of the room temperature detection means Th1, the outside temperature detection means Th2, and the heat storage temperature detection means Th3, and
~ Based on the stored contents of the third storage means 23 to 25, the normal heating capacity, heat storage recovery heating capacity, and required load corresponding to each temperature are calculated, and the comparison means 53
Their sizes are compared by . The operation control means 5 has the same effect as the invention of claim 1 above.
4, when the normal heating capacity is greater than the heat storage recovery heating capacity, or when the normal heating capacity is smaller than the heat storage recovery heating capacity but greater than the required load, the normal heating operation is performed. Therefore, the same effect as the invention of claim 1 can be obtained without performing a preliminary operation. (Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 3 onwards. FIG. 3 shows the overall configuration of the air conditioner according to the embodiment of the invention of claim 1, in which one outdoor unit A
A so-called multi-type air conditioner is constructed in which two outdoor units B and C are connected to the air conditioner. The above-mentioned outdoor unit A includes a compressor 1, a first four-way switching valve 2 that switches the connection as shown by the solid line in the figure during heating operation and as shown by the broken line in the figure during cooling operation, a condenser during cooling operation, and a condenser during heating operation. An outdoor heat exchanger 3 serving as an evaporator, a first electric expansion valve 4 serving as a pressure reduction mechanism that adjusts the refrigerant flow rate during cooling operation and reducing the pressure of the refrigerant during heating operation, and liquid refrigerant in the intake gas to the compressor 1. Accumulator 7 for separating
and a receiver 9 for storing liquid refrigerant are arranged as main equipment. Each of the indoor units B and C has the same configuration, and includes a second electric expansion valve 5 that reduces the pressure of the refrigerant during cooling operation and adjusts the flow rate of the refrigerant during heating operation, an evaporator during cooling operation, and an evaporator during heating operation. An indoor heat exchanger 6, which sometimes serves as a condenser, is arranged as the main equipment. The above-mentioned devices 1 to 7 and 9 are sequentially connected to each other through refrigerant piping 8 so that the refrigerant can flow therethrough, and the heat imparted to the refrigerant through heat exchange with air in the outdoor heat exchanger 3 is transferred to the indoor heat exchanger. The container 6 constitutes a main refrigerant circuit 10 that supplies indoor air. On the other hand, the outdoor unit A and the indoor unit B,
A heat storage unit D having a heat storage tank 12 containing water as a heat storage medium is arranged between the heat storage medium and the heat storage tank 12. A first coil 13 as a heat exchange coil for performing this and a second coil 14 for subcooling the refrigerant are provided. Further, the refrigerant of the refrigerant circuit 10 is supplied to the gas pipe 8 from the receiver 9 interposed in the liquid pipe 8c of the main refrigerant circuit 10 to the gas pipe 8d side.
A first bypass path 16 that bypasses to the d side branches, and the heat storage tank 12 is connected to the first bypass path 16.
A first coil 13 is provided within the first coil 1 .
3 and the liquid pipe 8c, a third electric expansion valve 17 as a pressure reducing mechanism that reduces the pressure of the refrigerant to the first coil 13.
is interposed. Here, on the gas pipe 8d side of the heat storage unit D, a second four-way switching valve 19 is connected to the first four-way switching valve 19.
The second four-way switching valve 19 is arranged in parallel with the second four-way switching valve 19.
As a result, the gas pipe side end of the first bypass path 16 is switchably connected to the discharge line 8a and suction line 8b of the compressor 1. The liquid pipe 8c of the heat storage unit D is provided with a first electromagnetic on-off valve 11 that controls opening and closing of the flow of refrigerant in the liquid pipe 8c, and the main refrigerant circuit 10 is connected from both ends of the first electromagnetic on-off valve 11. The second bypass path 18 to be bypassed is branched, and the second bypass path 18
, a second electromagnetic on-off valve 1 that controls opening and closing of the flow of refrigerant.
5 and the second coil 14 of the heat storage tank 12 are provided. On the other hand, various sensors are arranged in the device, and Th1 is arranged in each indoor unit B and C.
A room temperature sensor as a required capacity detection means that detects the required heating capacity Tcs corresponding to the temperature difference (Ts - Ta) from the set temperature Ts by detecting the indoor air temperature from the temperature of the air sucked into the indoor heat exchanger 6. As an example of this is shown in Table 1 below, a memory (not shown) built into the controller 22, which will be described later, stores a temperature difference (Ts
-Ta) for each step of the temperature difference set at 1 degree Celsius intervals, the required heating capacity is calculated and stored in advance as the condensing temperature Tcs.

[Table] In addition, P ₁ is attached to the discharge pipe 8a of the compressor 1, and from the high pressure value, the heating capacity Tc1 when using the outdoor heat exchanger 3 and the heating capacity Tc2 when using the heat exchange coil 13. A high-pressure sensor as a heating capacity detection means for detecting
The signals of Th1, Th1, and _P1 are connected to a controller 22 for controlling the operation of the entire apparatus so that the signals can be input. In addition, 20 is a capillary reach tube interposed between the connection port 19d of the second four-way switching valve 19 and the suction line 8b, and 21a to 21e are interposed at the inlet/outlet of the outdoor unit A of the refrigerant pipe 8. It is a hand-operated on-off valve. The above first, second and third electric expansion valves 4, 5, 1
7 opening control, first and second electromagnetic on-off valves 11, 15
opening/closing control and first and second four-way switching valves 2, 19
By switching, a connection switching mechanism 51 is configured which switches the connection of the circuit according to the operation mode such as heat storage operation for heating and cooling, heat storage recovery operation, etc. To explain its operation, during a heat storage operation in which warm heat is stored in the heat storage tank 12, as shown in FIG. With the electromagnetic on-off valve 15 closed, the first
The operation is performed while appropriately adjusting the opening degree of the electric expansion valve 4. That is, the discharged gas flows from the second four-way switching valve 19 to the first bypass path 16 side, is condensed in the first coil 13, is depressurized in the first electric expansion valve 4, and is evaporated in the outdoor heat exchanger 3. The heat exchanges with the refrigerant in the first coil 13 (see arrows in the figure), and warms the water that is the heat storage medium in the heat storage tank 12 . Note that, in order to prevent refrigerant from accumulating in the indoor heat exchanger 6, the first electromagnetic on-off valve 11 is opened, and the second electric expansion valve 5 is also slightly opened. In addition, during normal heating operation, as shown in FIG.
Normal heating operation is performed with the second electromagnetic on-off valve 15 closed. That is, the discharged refrigerant flows through the main refrigerant circuit 10, is condensed in the indoor heat exchanger 6, is depressurized in the first electric expansion valve 4, and is evaporated in the outdoor heat exchanger 3 (as indicated by the arrow in the figure). (Reference) By circulating, each room in which each of the indoor units B and C is installed is heated. Note that the third electric expansion valve 17 is closed during normal operation. During the heat storage recovery heating operation in which the heating operation is performed using the heat of the heat storage medium stored as described above, as shown in FIG. Switching to the solid line side in the figure, the first
The electric expansion valve 4 is closed and the first and second electromagnetic on-off valves 1
1 and 15 are opened and closed in the same manner as during normal heating operation, and operation is performed while appropriately adjusting the opening degree of the third electric expansion valve 17. That is, the refrigerant condensed in the indoor heat exchangers 6, 6 bypasses and flows from the main refrigerant circuit 10 to the first bypass path 16 side, is depressurized by the third electric expansion valve 17, and is transferred to the first coil 13 of the heat storage tank 12. By circulating the heat so as to evaporate it (see the arrow in the figure), the heat stored in the heat storage tank 12 is used to increase the low pressure of the compressor 1 and improve the operating efficiency. Next, the operation control performed by the controller 22 will be explained. FIG. 7 shows the flow of control according to the invention of claim 1, in which in step _S1 the circuit connection is switched by the connection switching mechanism 51 to perform heat storage recovery heating operation, and in step _S2 for a predetermined period of time (for example, about 10 minutes). After waiting for the time to elapse, in step _S3 , the saturation temperature corresponding to the condensing pressure (hereinafter referred to as condensing temperature), that is, the heating capacity when using the first coil 13, is input as Tc2 from the signal _of the high pressure sensor P1. . Then step
In step _S4 , the connection switching mechanism 51 is switched to perform normal heating operation, and in step _S5 , as in step _S3 above,
The condensing temperature at that time, that is, the heating capacity when using the outdoor heat exchanger 3, is determined from the signal of the high pressure sensor _P1 .
Enter as Tc1. After that, in step _S6 ,
First coil 1 input in steps S ₃ and S ₅ above
Heating capacity when using 3 and outdoor heat exchanger 3
Tc1 and Tc2 are compared, and if Tc1≧Tc2, it is determined that there is insufficient heat stored in the heat storage tank 12 and the heating capacity is insufficient, and the process proceeds to step _S7 , where normal heating operation is performed. On the other hand, when Tc1<Tc2, it is determined that there is a surplus in the amount of heat stored in the heat storage tank ₁₂ , and the process proceeds to step _S8 . Compare the required heating capacity Tcs found from the temperature difference (Ts − Ta) between the above indoor air temperature Ta and the set temperature Ts, and find that Tc1≧
If Tcs, it is determined that there is no need to use stored heat, and in step _S9 , normal heating operation is performed while inputting the heating capacity Tc1 when using the outdoor heat exchanger 3, and Tc1<Tcs Only when this happens, the process moves to step _S1 and heat storage recovery heating operation is performed for a predetermined period of time, and the above flow is then repeated. In the above flow, the preliminary operation control means controls the connection switching mechanism 51 to perform the normal heating operation after performing the heat storage recovery heating operation for a predetermined period of time through the steps S ₁ , S ₂ and S ₄ . 5
2 is configured, and in steps _S5 and _S8 , receives the outputs of the room temperature sensor (required capacity detection means) Th1, Th1 and the high pressure sensor (heating capacity detection means) _P1 , and determines the required heating capacity Tcs and the outdoor heat exchanger 3. Comparing means 53 is configured to compare heating capacities Tc1 and Tc2 when the first coil (heat exchange coil) 13 is used as an evaporator. In addition, in steps S ₁ and S ₇ , the output of the comparison means 53 is received, and both the heating capacity Tc2 when the first coil 13 is used and the required heating capacity Tcs are the heating capacity when the outdoor heat exchanger 3 is used. An operation control means 54 is configured to control the operation of the connection switching mechanism 51 so that the heat storage recovery heating operation is performed when the capacity is greater than the capacity Tc1, and the normal heating operation is performed at other times. Therefore, in the invention of claim 1, the operation of the connection switching mechanism 51 is controlled by the preliminary operation control means 52, and the refrigerant is condensed in the indoor heat exchanger 6 and evaporated in the heat exchange coil 13 of the bypass path 16. After a heat storage recovery heating operation in which the refrigerant is circulated for a predetermined period of time, a normal heating operation is performed in which the refrigerant condensed in the indoor heat exchanger 6 is circulated in such a way that it evaporates in the outdoor heat exchanger 3. At that time, the heating capacity detection means _P1 detects the heating capacity Tc1 when using the outdoor heat exchanger 3 and the heating capacity Tc2 when using the heat exchange coil 13, and the required capacity detection means Th1, Th1 calculate the total. The required heating capacity Tcs is detected. Then, the comparison means 53 compares their magnitude, and the operation control means 54 determines that when the heating capacity Tc1 when using the outdoor heat exchanger 3 is greater than the heating capacity Tc2 when using the first coil 13, Normal heating operation is performed without performing heat storage recovery operation.
In addition, heating capacity when using outdoor heat exchanger 3
Heating capacity when Tc1 uses the first coil 13
Even if it is smaller than Tc2, when the required heating capacity Tcs is smaller than the heating capacity Tc1 when the outdoor heat exchanger 3 is used, normal heating operation is performed, so heat storage is saved in case it is necessary. On the other hand, the first
If the heating capacity Tc2 when using the coil 13 is larger than the heating capacity Tc1 when using the outdoor heat exchanger 3, heat storage recovery heating operation is performed.
It does not impair the feeling of air conditioning. Therefore, the most advantageous operation can be selected while maintaining the air conditioning effect, and heat storage can be used effectively. In the above embodiment, a single high pressure sensor _P1 is arranged as a heating capacity detection means, but it may be separately arranged on the outdoor heat exchanger 3 side and the first coil side. The heating capacity may be detected by detecting the evaporation capacity using a pressure sensor or the like. Also, instead of the two pressure reducing mechanisms 4 and 17, a first
It is also possible to connect the bypass passage 16 and dispose a single electric expansion valve or the like in the liquid pipe 8c between the bypass passage 16 and the receiver 9. Next, an embodiment of the invention according to claim 2 will be described. FIG. 8 shows the overall configuration of an air conditioner according to a second embodiment of the invention, and the basic refrigerant circuit is the same as that of the first embodiment. Here, in this embodiment, the room temperature sensors Th1 and Th1 as the required capacity detection means in the first embodiment function as room temperature detection means, and in addition to that, the air intake port of the outdoor heat exchanger 3 , an outside temperature sensor Th2 is arranged as an outside temperature detection means for detecting the outside air temperature To from the intake air temperature, and the heat storage tank 12 has the following:
A water temperature sensor Th3 is arranged as a heat storage temperature detection means for detecting the temperature of water, which is a heat storage medium. Furthermore, the controller 22 includes a first memory 23 as a first storage means for storing the normal heating capacity Q ₁ of the outdoor heat exchanger 3 using the indoor air temperature Ta and the outdoor air temperature To as parameters, and a heat storage medium temperature
The first parameter is Tr and indoor air temperature Ta.
A second memory 24 as a second storage means for storing the heat storage recovery heating capacity Q ₂ of the coil 13 and the room temperature Ta
A third memory 25 is built-in to store the required load Q _D using the temperature difference (Ts - Ta) between the temperature and the set temperature Ts as a parameter. Here, examples of the contents of each of the memories 23 to 25 are shown in Tables 2 to 4 on the next page, respectively.
That is, in Table 2, the required load Q _D is calculated and stored in advance for each step of the temperature difference (Ts - Ta) set at 1°C intervals between the set temperature Ts and the room temperature Ta. ing. In addition, in Table 3, for each indoor temperature Ta value, the outside air temperature
The normal heating capacity Q ₁ as the heat exchange capacity of the outdoor heat exchanger 3 is calculated in advance from the value of To (in units of 1°C),
remembered. And, as shown in Table 4,
For each indoor temperature Ta, the heat storage medium

【table】

【table】

[Table] Heat storage recovery heating capacity Q ₂ as the heat exchange capacity of the first coil 13 based on the value of body temperature Tr (in units of 1°C)
is calculated and stored in advance. Also in this embodiment, the switching mechanism 51 for the operation modes of heat storage operation, normal heating operation, and heat storage recovery heating operation and the flow of refrigerant in each operation mode are the same as those of the first embodiment shown in FIGS. 4 to 6 above. Same as in case. Next, the control of the invention of claim 2 will be explained based on the flowchart of FIG.
In step _S11 , the room temperature Ta is detected, and in step _S12 , the required load _QD is calculated and determined based on the temperature difference (Ts-Ta) between the set temperature Ts and the room temperature Ta. Similarly, step
In steps S ₁₃ and S ₁₄ , the outside air temperature To is detected and the normal heating capacity Q ₁ is predicted, and in steps S ₁₅ and S ₁₆ , the heat storage medium temperature Tr is detected and the heat storage recovery heating capacity Q ₂ is predicted. Execute. And the steps
In S ₁₇ , the normal heating capacity Q ₁ and the heat storage recovery heating capacity Q ₂ are compared, and if Q ₁ ≧ Q ₂ , normal heating operation is performed in step S ₁₈ , while if Q ₁ < Q ₂ , In step S ₁₉ , the normal heating capacity Q ₁ and the required load Q _D are further compared, and if Q ₁ < Q _D , the heat storage recovery heating operation is performed in step S ₂₀ , otherwise, the
After each normal heating operation is performed in _S21 , the process returns to step _S1 and the above flow is repeated. In the _above flow, each of _the above sensors (detection _means ) Th
1, Th2, and Th3, and calculates the normal heating capacity, heat storage recovery heating capacity, and required load from the stored contents of each memory (storage means) 23, 24, and 25 at the corresponding temperature. Steps _S17 and _S19 constitute a comparison means 53 which receives the output of the calculation means 55 and compares the normal heating capacity _Q1 , the heat storage recovery heating capacity _Q2 , and the required load _QD . Also, step
Through S ₁₈ , S ₂₀ and S ₂₁ , the output of the comparison means 53 is received, and the heat storage recovery heating operation is performed only when the heat storage recovery heating capacity Q ₂ and the required load Q _D are larger than the normal heating capacity, and at other times. An operation control means 54 is configured to control the connection switching mechanism 51 to perform normal heating operation. Therefore, in the second embodiment, the calculation means 5
5, the first to third memories (storage means) 23 to 2 receive the outputs of the room temperature detection means Th1, Th1, the outside temperature detection means Th2, and the heat storage temperature detection means Th3.
Based on the stored contents of 5, the normal heating capacity Q ₁ , the heat storage recovery heating capacity Q ₂ and the required load Q _D corresponding to each temperature are calculated, and the comparison means 53 compares their magnitude. Then, in the same manner as the invention of claim 1, when the normal heating capacity Q ₁ is greater than or equal to the heat storage recovery heating capacity Q ₂ , the operation control means 54 controls:
Or normal heating capacity Q ₁ is heat storage recovery heating capacity Q ₂
Even if the load is smaller, if it is equal to or greater than the required load Q _D , normal heating operation is performed. Therefore, the same effects as those of the invention of claim 1 can be obtained, and in particular, there is an advantage that an appropriate operation mode can be determined in advance without performing a preliminary operation. Although both the first and second embodiments above have been described regarding multi-type air conditioners, it goes without saying that the invention can also be applied to so-called pair-type air conditioners in which one outdoor unit and one indoor unit correspond to each other. . (Effect of the invention) As explained above, according to the invention of claim 1, the heat exchange coil of the heat storage tank is arranged in parallel with the outdoor heat exchanger of the refrigerant circuit, and the normal heating operation and the heat storage recovery heating operation are performed. During heating operation of an air conditioner configured to be switchable, heat storage heating operation and normal heating operation are sequentially performed in preliminary operation, and heating is performed using the outdoor heat exchanger and heat exchange coil detected at that time. Compare the capacity and required indoor heating capacity, and perform heat storage recovery heating operation only when the heating capacity and required heating capacity when using a heat exchange coil are larger than the heating capacity when using an outdoor heat exchanger as an evaporator. As a result, it is possible to improve the heat storage utilization efficiency while maintaining a good air-conditioned feeling. Further, according to the invention of claim 2, the room temperature, outside air temperature, and heat storage medium temperature are detected, and the normal heating capacity, heat storage recovery heating capacity, and required load, which are set in advance using these as parameters, are predicted, and these values are calculated. Since the operation control is performed based on the comparison and judgment that it is similar to the invention of claim 1, the same effect as the invention of claim 1 can be obtained without performing preliminary operation.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are block diagrams showing the configuration of the invention according to claims 1 and 2, respectively. Third
7 to 7 show an embodiment of the invention of claim 1, FIG. 3 is a refrigerant system diagram showing the overall configuration, and FIGS.
Fig. 6 is a diagram showing each operation mode of heat storage operation, normal heating operation, and heat storage recovery heating operation in order, Fig. 7 is a flowchart showing the details of control, and Figs. 8 and 9 are the invention of claim 2. Example 8
The figure is a refrigerant system diagram showing the overall configuration, and FIG. 9 is a flowchart showing the details of control. 1... Compressor, 3... Outdoor heat exchanger, 4... First electric expansion valve (pressure reduction mechanism), 6... Indoor heat exchanger,
8c... Liquid pipe, 8d... Gas pipe, 10... Main refrigerant circuit, 12... Heat storage tank, 13... First coil (heat exchange coil), 16... First bypass path, 17...
...Third electric expansion valve (pressure reducing mechanism), 23...First memory (first storage means), 24...Second memory (second storage means), 25...Third memory (third storage means), 51...Connection switching mechanism, 52...Preliminary operation control means, 53...Comparison means, 54...Operation control means, 55...Calculation means, _P1 ...High pressure sensor (heating capacity detection means), Th1... Room temperature sensor (required capacity detection means, room temperature detection means, Th2...outside temperature sensor (outside temperature detection means), Th3...water temperature sensor (heat storage temperature detection means).

Claims (1)

[Claims] 1. A refrigerant circuit 10 connecting a compressor 1, an outdoor heat exchanger 3, and an indoor heat exchanger 6, a heat storage tank 12 containing a heat storage medium that can store heat, and the refrigerant circuit described above. a heat exchange coil 13 that is interposed in a bypass path 16 between the liquid pipe 8c and the gas pipe 8d of 10 and exchanges heat between the heat storage medium of the heat storage tank 12 and the refrigerant; and the outdoor heat exchanger during heating operation. 3 and pressure reducing mechanisms 4 and 17 that reduce the pressure of the refrigerant to the heat exchange coil 13, during heating operation, the refrigerant is circulated so that the refrigerant condensed in the indoor heat exchanger 6 is transferred to the outside. A normal heating operation route in which the refrigerant circulates so as to evaporate in the heat exchanger 3, and a heat storage recovery heating operation route in which the refrigerant condensed in the indoor heat exchanger 6 circulates so as to evaporate in the heat exchange coil 13 of the bypass path 16. a connection switching mechanism 51 that selectively switches between the two; a preliminary operation control means 52 that operates the connection switching mechanism 51 to perform normal heating operation after performing heat storage recovery heating operation for a predetermined time; A heating capacity detection means P1 detects the heating capacity when the outdoor heat exchanger 3 and the heat exchange coil 13 are used as an evaporator during operation by the preliminary operation control means 52, and a heating capacity detection means _P1 detects the required indoor heating capacity based on the room temperature. A required capacity detecting means Th1 receives the outputs of the required capacity detecting means Th1 and the heating capacity detecting means _P1 , and calculates the required heating capacity, the heating capacity when the outdoor heat exchanger 2 is used as an evaporator, and the heat exchange coil. Comparing means 53 compares heating capacity when heat exchange coil 13 is used as an evaporator; The connection switching mechanism 51 is configured to perform the heat storage recovery heating operation when the heating capacity is greater than the heating capacity when the heat exchanger 3 is used as an evaporator, and to perform the normal heating operation at other times.
1. An operation control device for a regenerative air conditioner, comprising: an operation control means 54 for controlling the operation of the regenerative air conditioner. 2. A refrigerant circuit 10 connecting the compressor 1, the outdoor heat exchanger 3, and the indoor heat exchanger 6, a heat storage tank 12 containing a heat storage medium capable of storing heat and heat, and a liquid pipe 8c of the refrigerant circuit 10. A heat exchange coil 13 that is interposed in a bypass path 16 between the gas pipe 8d and performs heat exchange between the heat storage medium of the heat storage tank 12 and the refrigerant, and the outdoor heat exchanger 3 and the heat exchange coil 13 during heating operation. In a regenerative air conditioner equipped with depressurization mechanisms 4 and 17 that reduce the pressure of refrigerant, during heating operation, the refrigerant is circulated so that the refrigerant condensed in the indoor heat exchanger 6 is evaporated in the outdoor heat exchanger 3. Alternatively, there is a path for normal heating operation in which the refrigerant circulates so that the refrigerant condenses in the indoor heat exchanger 6 is evaporated in the heat exchange coil 13 of the bypass path 16. A connection switching mechanism 51 for switching, a room temperature detection means Th1 for detecting the indoor air temperature, an outside temperature detection means Th2 for detecting the temperature of the outdoor air,
A heat storage temperature detection means Th3 that detects the temperature of the heat storage medium in the heat storage tank 12, a first storage means 23 that stores the normal heating operation ability using the outdoor air temperature and the indoor air temperature as parameters, and the heat storage medium temperature and A second storage means 24 for storing the heat storage recovery heating capacity using the indoor air temperature as a parameter, a third storage means 25 for storing the required heating load using the indoor air temperature and the set temperature as parameters, and each of the above-mentioned detection means.
A calculation means 55 receives the outputs of Th1, Th2, and Th3 and calculates the normal heating capacity, heat storage recovery heating capacity, and required load from the stored contents of the storage means 23, 24, and 25 at the corresponding temperature;
Comparison means 53 receives the output of 5 and compares the normal heating capacity, heat storage recovery heating capacity, and required load.
In response to the output of the comparison means 53, the connection switching mechanism is configured to perform the heat storage recovery heating operation only when the heat storage recovery heating capacity and the required load are greater than the heat storage recovery heating capacity, and to perform the normal heating operation at other times. 5
1. An operation control device for a regenerative air conditioner, comprising: an operation control means 54 for controlling the operation of a regenerative air conditioner.