JP2839457B2 - Thermal storage type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using air as a heat source, and more particularly to a heat storage type air conditioner having a heat storage / radiation function for utilizing nighttime electric power and a control function thereof.

[0002]

2. Description of the Related Art Various types of regenerative air conditioners have already been developed.
There is a regenerative air conditioner as disclosed in JP-A-236.

[0003] The basic technology is described in FIG.
As shown in FIG. 1, the outdoor unit 1 includes a compressor 2 and a first four-way valve 3.
a, heat source side heat exchanger 4, first expansion valve 5a, first switching valve K
V1, a refrigerant-to-refrigerant heat exchanger HEX comprising a first auxiliary heat exchanger 7a and a second auxiliary heat exchanger 7b, and a heat storage heat exchanger 8
and a heat storage tank STR composed of a heat exchanger 8b and a heat exchanger 8b.
2, a refrigerant amount adjusting tank 11 and a refrigerant transport pump PM for transporting the liquid refrigerant. Further, the plurality of indoor units 13a and 13b are configured by use-side heat exchangers 14a and 14b.

[0004] The heat source side refrigeration cycle includes a compressor 2,
A first four-way valve 3a, a heat source side heat exchanger 4, a first expansion valve 5a,
It comprises a first switching valve KV1, a first auxiliary heat exchanger 7a, and a heat storage heat exchanger 8a.

The use-side refrigeration cycle includes a second auxiliary heat exchanger 7b, a heat-dissipating heat exchanger 8b, and a second auxiliary heat exchanger 8b for switching the flow path of the refrigerant.
It comprises a switching valve KV2, a refrigerant amount adjusting tank 11, a refrigerant transport pump PM for transporting the refrigerant, and indoor units 13a and 13b.

Next, the refrigeration cycle will be described. This refrigeration cycle can be broadly divided into a cooling heat storage operation for making ice at night (or a heating heat storage operation for producing hot water) and a daytime cooling (or heating) operation.
The heating heat storage operation and daytime heating operation will be described only in the operation mode, and will not be described in detail. A) Night heat storage operation In the heat source side refrigeration cycle, the heat storage tank STR operates,
The first switching valve KV1 is switched so that the refrigerant-to-refrigerant heat exchanger HEX does not operate. At this time, the refrigerant transport pump PM is stopped, and the use side cycle does not operate. The operation of the heat source side refrigeration cycle will be described below.

The mode of the first four-way valve 3a is as follows.
The case where the discharge side of the compressor 2 communicates with the heat source side heat exchanger 4 and the suction side of the compressor 2 communicates with the heat storage tank STR is a cooling mode.
A case in which the discharge side of the compressor 2 communicates with the heat storage tank STR, and the case where the suction side of the compressor 2 communicates with the heat source side heat exchanger 4 are defined as a heating mode.

The first switching valve KV1 is set so that the heat storage tank STR communicates with the first expansion valve 5a in the heat source side refrigeration cycle by setting the first STR circuit and the refrigerant-to-refrigerant heat exchanger H.
The setting for communicating the EX with the first expansion valve 5a is defined as a first HEX circuit.

A-1) Cooling / heat storage operation The first four-way valve 3a is in a cooling mode, the first expansion valve 5a is a predetermined opening, and the first switching valve KV1 is a first STR circuit. At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is condensed in the heat source side heat exchanger 4 and decompressed by the first expansion valve 5a to be in a liquid or two-phase state, and heat exchange for heat storage in the heat storage tank STR is performed. After evaporating in the vessel 8a and absorbing heat from the water 9 as a heat storage material,
Return to the compressor 2.

As a result, cold water and ice are produced around the heat storage heat exchanger 8a in the heat storage tank STR, and the heat is stored. B) Daytime operation In the daytime cooling (or heating) operation, the compressor 2, the heat source side heat exchanger 4, the refrigerant-to-refrigerant heat exchanger HEX, the refrigerant transfer pump PM, and the use side heat exchangers 14a and 14b are operated. It can be divided into a normal cooling (or normal heating) operation and a peak load cooling (or peak load heating) operation in which a heat storage tank STR is added to the normal cooling (or normal cooling and heating) operation.

These operation patterns are selectively used depending on the indoor load or the amount of heat stored in the heat storage tank STR during the nighttime heat storage operation. For example, when the indoor load in the early morning is small, the normal cooling operation is performed, when the indoor load at noon is large, the operation is switched to the peak load cooling operation, and when the amount of heat stored in the heat storage tank STR is exhausted, the normal cooling operation is switched to the normal cooling operation again. Peak load.

The operation of the refrigeration cycle in these operation patterns will be described below. Also, the second switching valve K
Regarding V2, the setting for communication between the refrigerant-to-refrigerant heat exchanger HEX and the use-side heat exchangers 14a and 14b in the use-side refrigeration cycle is set in the second HEX circuit and the refrigerant-to-refrigerant heat exchanger HEX.
The setting for communication between the heat storage tank HEX and the use-side heat exchangers 14a and 14b is defined as a second (HEX + STR) circuit.

B-1) Normal Cooling Operation In the heat source side refrigeration cycle, the first four-way valve 3a is set in the cooling mode,
The first expansion valve 5a is set to a predetermined opening degree, and the first switching valve KV1 is set to the first opening degree.
HEX circuit. At this time, the high-temperature and high-pressure refrigerant sent from the compressor 2 is condensed in the heat source side heat exchanger 4 and decompressed by the first expansion valve 5a to be in a liquid or two-phase state, and is sent to the first auxiliary heat exchanger 7a. To return to the compressor 2.

The use side refrigeration cycle includes a second switching valve KV2.
Is a second HEX circuit. At this time, the gas refrigerant flowing out of the second switching valve KV2 is condensed in the second auxiliary heat exchanger 7b to become a liquefied or two-phase refrigerant, and the refrigerant amount adjusting tank 1
1 and is sent to the use side heat exchangers 14a and 14b by the refrigerant transport pump PM. Here, cooling is performed by absorbing heat from room air.

Thereafter, the refrigerant again passes through the second switching valve KV2 and flows into the second auxiliary heat exchanger 7b.

B-2) Peak load cooling operation This is an operation in which the heat-dissipating heat exchanger 8b of the heat storage tank STR is added to the normal cooling operation of B-1. The heat source side refrigeration cycle is B-
Since the operation is the same as that of the normal cooling operation of No. 1, the description is omitted, and the use side refrigeration cycle will be described.

The use side refrigeration cycle includes a second switching valve KV2
Is a second (HEX + STR) circuit. At this time, the gas refrigerant flowing out of the use side heat exchangers 14a and 14b
It flows into the switching valve KV2. The valve opening of the second switching valve KV2 is adjusted in accordance with the capabilities of the heat storage tank STR and the refrigerant-to-refrigerant heat exchanger HEX.

A part of the gas refrigerant is sent from the second switching valve KV2 to the second auxiliary heat exchanger 7b, and the first auxiliary heat exchanger 7a
And is sent to the refrigerant amount adjusting tank 11. The remaining gas refrigerant is sent to the heat exchanger for heat dissipation 8b,
The cold water and ice formed around the heat storage heat exchanger 8a by the cooling / heat storage operation at night cools and condenses the liquid into a liquid refrigerant, which is sent to the refrigerant amount adjusting tank 11.

At this time, the amount of heat radiated from the heat storage tank is predetermined by air-conditioning load prediction control or the like, and the second switching valve KV2 is opened and closed according to the target degree of supercooling SC1 at the outlet of the heat radiating heat exchanger 8b. Radiating heat exchanger 8
It is controlled by adjusting the amount of circulating refrigerant flowing into b.

The liquid refrigerant in the refrigerant amount adjusting tank 11 is supplied to the use side heat exchangers 14a, 14a by the refrigerant transfer pump PM.
b to absorb heat from room air, evaporate and cool.

Thereafter, the gasified refrigerant passes through the second switching valve KV2 again and flows into the second auxiliary heat exchanger 7b and the heat radiation heat exchanger 8b.

In this case, the capacity of the heat source side refrigeration cycle and
This is almost the sum of the heat dissipation capacity of the heat storage tank STR and the heat dissipation capacity of the heat exchanger 8b, and the cooling capacity is increased.

The normal cooling operation and the peak load cooling operation are selectively used depending on the amount of heat stored in the heat storage tank STR by the indoor load or the night heat storage operation. For example, when the indoor load in the early morning is small, the normal cooling operation is performed, when the indoor load at noon is large, the operation is switched to the peak load cooling operation, and when the amount of heat stored in the heat storage tank STR is exhausted, the normal cooling operation is switched to the normal cooling operation again. Peak load.

As described above, by converting surplus power energy at night into heat and storing the heat, and using the power during the day, power peaks at high load times during the day are suppressed, and power usage is leveled. Can be achieved.

[0025]

However, in the above-mentioned conventional example, the amount of heat radiation from the heat-radiating heat exchanger 8b is controlled in accordance with a predetermined target degree of supercooling SC1. In the case where the refrigerant retained in the use-side refrigeration cycle is unevenly distributed, even if the control is performed according to the target supercooling degree SC1, it is not possible to control the heat release amount as intended. For this reason, the operation according to the air conditioning load prediction control becomes impossible,
There is a drawback that the advantage of heat storage cannot be utilized, such as insufficient heat radiation capacity from the heat storage tank STR at the time of peak load.

In view of the above drawbacks, the present invention sets a control target such as the target supercooling degree SC1 at any time in the cooling operation using the heat radiating heat exchanger when the target heat release amount cannot be controlled. It is an object of the present invention to provide a regenerative air conditioner capable of correcting and appropriately adjusting the amount of heat radiation from a heat exchanger for heat radiation.

[0027]

The technical means of the present invention for solving the above-mentioned problems includes a compressor, a first four-way valve, a heat source side heat exchanger, a first expansion valve, and a first auxiliary heat exchange. A first auxiliary heat exchanger of a refrigerant-to-refrigerant heat exchanger comprising a heat exchanger and a second auxiliary heat exchanger is sequentially connected in a ring shape, and the second expansion valve and the heat storage heat exchanger and the heat radiation heat exchanger A heat storage material made of a heat storage material and a heat storage heat exchanger of a heat storage tank connected in series are connected in parallel to a serial connection part of the first expansion valve and the first auxiliary heat exchanger of the refrigerant-to-refrigerant heat exchanger. A heat source side refrigeration cycle connected thereto, a pump unit including a refrigerant transfer pump, a second four-way valve, and a refrigerant tank; a plurality of indoor units including an indoor flow valve and a use side heat exchanger; A heat exchanger and a first flow valve connected in series, a two-way valve and the heat exchange And a second side flow valve connected in series and a second side flow valve connected in parallel with a utilization side refrigeration cycle in which the one side is connected in parallel, and a cooling operation mode using the heat radiating heat exchanger. Operating mode detecting means for detecting the above, a target heat radiating capacity detecting means for calculating a target heat radiating capacity of the heat radiating heat exchanger during the cooling operation, and a control target of the second flow valve during the cooling operation. Target supercooling degree calculating means for calculating the target supercooling degree, time detecting means for detecting a predetermined time, heat storage amount calculating means for detecting the heat storage amount in the heat storage tank at every predetermined time, and a change in the heat storage amount A heat radiation amount calculating means for calculating the actual heat radiation capacity of the heat radiation heat exchanger from the amount, a target supercooling degree correcting means for correcting the target supercooling degree, and an actual measurement of the heat radiation heat exchanger outlet during a cooling operation. A supercooling degree detecting means for detecting a supercooling degree; A first control device comprising second flow valve driving means for opening and closing the second flow valve so that the degree of subcooling coincides with the target degree of supercooling; When it is detected that the cooling operation is performed in a cycle using the heat exchanger, the target supercooling at the outlet of the heat-dissipating heat exchanger is set as a control target of the second flow valve during the cooling operation by the target supercooling degree calculating means. Calculate the degree. Also, the first heat storage amount in the first predetermined time detected by the time detecting means is detected by the heat storage amount calculating means, and the second heat storage amount in the second predetermined time detected by the time detecting means is stored in the heat storage amount. Detected by arithmetic means. In addition, the actual heat dissipation capacity of the heat exchanger for heat dissipation is obtained from the change amount of the first heat storage amount and the second heat storage amount and the change amount of the first predetermined time and the second predetermined time by the heat release amount calculating means. Is calculated. Further, when the actual heat dissipation capacity is smaller than the target heat dissipation capacity, the target supercooling degree correction means corrects the target supercooling degree downward, while when the actual heat dissipation capacity is greater than the target heat dissipation capacity, The target supercooling degree correction means corrects the target supercooling degree upward,
The second flow valve is opened and closed by a flow valve driving means such that the actually measured supercooling degree at the outlet of the heat-radiating heat exchanger matches the target supercooling degree.

Another regenerative air conditioner of the present invention is:
A third flow valve bypass having a third flow valve bypassing the second flow valve, the heat radiation heat exchanger, and the two-way valve; and a cooling operation mode using the heat radiation heat exchanger. Operating mode detecting means for detecting the temperature, the target heat radiating capacity detecting means for calculating the target heat radiating capacity of the heat radiating heat exchanger during the cooling operation, and the control target of the third flow valve during the cooling operation. Target flow valve opening calculating means for calculating the target flow valve opening degree, and the time detecting means for detecting a predetermined time,
The heat storage amount calculating means for detecting the heat storage amount in the heat storage tank at every predetermined time; the heat release amount calculating means for calculating the actual heat release capability of the heat radiation heat exchanger from the change amount of the heat storage amount; Target flow valve opening correction means for correcting the flow valve opening; and third flow valve driving means for opening and closing the third flow valve so that the opening of the third flow valve matches the target flow valve opening. A second control device, wherein when the operation mode detecting means detects a cooling operation in a cycle using the heat radiating heat exchanger, the target flow rate valve opening calculating means performs a cooling operation. A target flow valve opening degree as a control target of the third flow valve at the time is calculated. Also, the first time in the first predetermined time detected by the time detecting means
The heat storage amount is detected by the heat storage amount calculating means, and the second heat in the second predetermined time detected by the time detecting means is detected.
The heat storage amount is detected by the heat storage amount calculating means. Also,
The first heat storage amount and the second heat storage amount are calculated by the heat release amount calculating means.
The actual heat radiation capacity of the heat radiation heat exchanger is calculated from the change amount of the heat storage amount and the change amounts of the first predetermined time and the second predetermined time. Further, when the actual heat dissipation capacity is smaller than the target heat dissipation capacity, the target flow valve opening degree correction means corrects the target flow valve opening degree downward, while the actual heat dissipation capacity is larger than the target heat dissipation capacity. The target flow valve opening correction means corrects the target flow valve opening upward by the target flow valve opening correction means, and the third flow valve drive means makes the third flow valve opening degree coincide with the target flow valve opening degree. It opens and closes the flow valve.

[0029]

In the regenerative air conditioner of the present invention, the operation mode detecting means detects the cooling operation in the cycle using the heat radiating heat exchanger.

In the cooling operation in the cycle using the heat exchanger for heat radiation, the target supercooling degree which is the control target of the second flow valve during the cooling operation is detected by the target supercooling degree calculating means.

Next, the first heat storage amount in the first predetermined time detected by the time detecting means is detected by the heat storage amount calculating means. Then, the second heat storage amount in the second predetermined time detected by the time detecting means is detected by the heat storage amount calculating means.

At this time, the first heat radiation amount is calculated by the heat radiation amount calculating means.
The actual heat radiation capacity of the heat radiation heat exchanger is calculated from the heat storage amount and the change amount of the second heat storage amount, and the change amount of the first predetermined time and the second predetermined time.

When the actual heat dissipation capacity is smaller than the target heat dissipation capacity detected by the target heat dissipation capacity detecting means,
The target supercooling degree correcting means corrects the target supercooling degree downward. When the actual heat dissipation capacity is larger than the target heat dissipation capacity, the target supercooling degree correcting means corrects the target supercooling degree upward.

Here, the second flow valve is opened and closed by the second flow valve driving means so that the actually measured supercool degree detected by the supercool degree detection means coincides with the target supercool degree, thereby providing the heat radiation. The actual heat dissipation capacity is controlled by increasing or decreasing the amount of refrigerant circulating through the heat exchanger.

With the above operation, the target supercooling degree is corrected according to the magnitude of the actual heat dissipation capacity with respect to the target heat dissipation capacity. Therefore, even if the predetermined target supercooling degree is not appropriate, control according to the target heat dissipation capacity is performed. There is an effect that can be.

Further, another regenerative air conditioner of the present invention comprises:
The operation mode detecting means determines whether the operation is the cooling operation in the cycle using the heat radiation heat exchanger.

In the cooling operation in a cycle using the heat-exchanging heat exchanger, the target flow valve opening calculating means calculates
The target flow valve opening, which is the control target of the third flow valve during the cooling operation, is detected. Next, the first heat storage amount during the first predetermined time detected by the time detecting means is detected by the heat storage amount calculating means. Then, the second heat storage amount in the second predetermined time detected by the time detecting means is detected by the heat storage amount calculating means.

At this time, the heat-dissipating heat exchanger is used by the heat-dissipating-amount calculating means based on the change amounts of the first heat storage amount and the second heat storage amount and the change amounts of the first predetermined time and the second predetermined time. Is calculated.

When the actual heat radiation capacity is smaller than the target heat radiation capacity detected by the target heat radiation capacity detecting means, the target flow rate valve opening is corrected downward by the target flow rate valve opening correcting means. The amount of the refrigerant circulating through the heat exchanger for heat radiation increases by the amount of the circulation of the refrigerant bypassing the heat exchanger for heat radiation, thereby increasing the actual heat radiation capacity.

On the other hand, when the actual heat radiation capacity is larger than the target heat radiation capacity, the target flow valve opening correction means corrects the target flow valve opening upward by the target flow valve opening correction means, so that the inside of the heat radiation heat exchanger is improved. The amount of the circulating refrigerant passing through the heat exchanger for heat radiation is reduced by the amount of the amount of the refrigerant circulating bypassing, and the actual heat radiation capacity is reduced.

By controlling the heat dissipation capacity of the heat exchanger for heat dissipation by the above operation, the target flow valve opening is corrected by correcting the actual heat dissipation capacity with respect to the target heat dissipation capacity.
Even when the predetermined target flow valve opening is not appropriate, not only can the control according to the target heat radiation capacity be performed, but also the refrigerant circulation amount of the heat radiation heat exchanger by bypassing the refrigerant flowing into the heat radiation heat exchanger. Therefore, there is an effect that the circulation amount control width is widened to control the heat radiation capacity, and a wider heat radiation capacity control can be performed.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those of the prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a refrigeration cycle diagram of the first embodiment of the present invention. This regenerative air conditioner is an outdoor unit 1 '
, A heat storage tank STR, a pump unit PU, and indoor units 13a and 13b.

The outdoor unit 1 'comprises a compressor 2, a first four-way valve 3a, a heat source side heat exchanger 4, a first expansion valve 5a, a second expansion valve 5b, a first auxiliary heat exchanger 7a and a second auxiliary heat exchanger. Exchanger 7b
And a first flow valve RV1 for the second auxiliary heat exchanger 7b, and a second flow valve RV2 for the heat release heat exchanger 8b of the heat storage tank STR.

The heat storage tank STR comprises water 9 as a heat storage material, a heat storage heat exchanger 8a, and a heat release heat exchanger 8b. The pump unit PU includes a refrigerant tank 11, a refrigerant transport pump PM,
And the second four-way valve 3b, and the indoor unit 13a,
13b is use side exchangers 14a, 14b, indoor flow valve 1
5a and 15b and indoor fans 16a and 16b.

In the above configuration, the heat source side refrigeration cycle includes the compressor 2, the first four-way valve 3a, the heat source side heat exchanger and 4, the first expansion valve 5a, the first auxiliary heat exchanger 7a and the second The refrigerant-to-refrigerant heat exchanger HEX comprising the auxiliary heat exchanger 7b and the first auxiliary heat exchanger 7a are sequentially connected in a ring shape, and
Expansion valve 5b, heat storage heat exchanger 8a, and heat radiation heat exchanger 8
b and a heat storage heat exchanger 8a of a heat storage tank STR comprising a heat storage material 9 are connected in series to the first expansion valve 5a and the first auxiliary heat exchanger 7a of the refrigerant-to-refrigerant heat exchanger HEX.
And connected in parallel to the series connection part.

The user-side refrigeration cycle includes a refrigerant transfer pump P
M, a pump unit PU including the second four-way valve 3b and the refrigerant tank 11, and a plurality of indoor units 13a and 13 including the indoor flow valves 15a and 15b and the use-side heat exchanger 7b.
b, in which the second auxiliary heat exchanger 7b and the first flow valve 5a are connected in series, whereas the two-way valve NV, the heat radiation heat exchanger 8b and the second flow valve 5b are connected in series. And those connected in parallel to each other.

An operation mode detecting means 1 for detecting a cooling operation mode using the heat-exchanging heat exchanger 8b.
9, a target heat radiation capacity detecting means 20 for detecting a target heat radiation capacity q0 of the heat radiation heat exchanger 8b during the cooling operation, and a target supercooling degree S which is a control target of the second flow valve RV2 during the cooling operation.
Target supercooling degree calculating means 21 for calculating C1, time detecting means 22 for detecting a predetermined time, and heat storage tank S every predetermined time.
Heat storage amount calculation means 23 for detecting the heat storage amount in TR, heat release amount calculation means 24 for calculating the actual heat release capacity q1 of heat release heat exchanger 8b from the change amount of the heat storage amount, and correct target supercooling degree SC1. The target supercooling degree correcting means 25, the supercooling degree detecting means 26 for detecting the actually measured supercooling degree SC at the outlet of the heat-dissipating heat exchanger 8b during the cooling operation, and the actually measured supercooling degree SC coincides with the target supercooling degree SC1. Control device CN comprising a second flow valve driving means 27 for opening and closing the second flow valve RV2
1 is provided.

Here, the water level sensor LM is shown as a specific example for detecting the amount of heat stored in the heat storage tank.

The pressure sensor 17 and the thermistor 18
Shows a specific example of detecting the actually measured degree of supercooling SC at the outlet of the heat radiation heat exchanger 8b.

As described in the conventional example, the setting for connecting the refrigerant-to-refrigerant heat exchanger HEX and the user-side heat exchangers 14a and 14b in the user-side refrigeration cycle is set in the second HEX circuit and the refrigerant-to-refrigerant heat exchanger. The setting for communication between the heat exchanger HEX, the heat storage tank HEX, and the use-side heat exchangers 14a and 14b is set to the second (HE
(X + STR) circuit.

Next, the operation of the configuration of the first embodiment will be described. However, since the operation is the same as that of the conventional example except the operation of the first control device CN1, the description of the operation of each operation pattern is omitted. The operation of the first control device CN1 different from the conventional example will be described with reference to the flowchart of FIG.

In STEP 1, the operation mode detecting means 19 detects whether or not the operation mode is the cooling operation mode using the heat exchanger 8b for heat radiation, and the cooling operation mode using the heat exchanger 8b for heat radiation. If not, the process proceeds to STEP2, and otherwise, the process exits the routine.

In STEP 2, the target heat radiation capability detecting means 20
Thus, in the so-called air-conditioning load prediction control for determining the heat radiation scheduling of the heat storage tank STR, the target heat radiation capacity q0 (for example, q0 = 10) of the heat radiation heat exchanger 8b during the cooling operation.
kW), and then proceeds to STEP3.

In STEP 3, the target supercooling degree calculating means 21 is used.
After calculating the target supercooling degree SC1 (for example, SC1 = 7K) which is the control target of the second flow valve RV2 during the cooling operation, the process proceeds to STEP4. This target supercooling degree SC1
Is a predetermined value determined in advance corresponding to the target heat dissipation capacity q0.

In STEP 4, the time detecting means 22 detects whether or not the timer for detecting the time has already been started.
The process proceeds to STEP7 if the process has already been started.

In STEP 5, the timer is started from t = 0, and the flow proceeds to STEP 7.

In STEP 6, the timer stores the heat storage amount Q0 (eg, Q0) during the first predetermined time t1 (eg, t1 = 0S).
= 10,000 kJ) and exits the routine.

In STEP 7, it is determined whether or not the timer has elapsed for a second predetermined time t2 (for example, t1 = 10 × 60S). If it has elapsed, the process proceeds to STEP 8, and if not, the routine exits. .

In STEP 8, the heat storage amount Q1 at t = t1
(For example, Q1 = 5000 kJ), and
Move to

In STEP 9, Q0 obtained in STEP 6 is obtained.
And Q1 obtained in STEP8 and the elapsed time t2-t1 by the following equation (1), the actual heat-dissipating capacity q1 of the heat-dissipating heat exchanger 8b at the elapsed time t2-t1 (for example, q1 =
8.3 kW), and the process proceeds to STEP 10.

[0062]

(Equation 1)

In STEP 10, if the actual heat dissipation capacity q1 is larger than the target heat dissipation capacity q0, the process proceeds to STEP11, otherwise the process proceeds to STEP12. (For example, q1 <q
From STEP 0, the process proceeds to STEP 12. In STEP 11, it is determined that the heat radiation capability of the heat radiation heat exchanger 8b is higher than the target value.
The target subcooling degree SC1, which is the control target of the flow rate valve RV2, is corrected to be increased by a predetermined value a (for example, a = 3K: that is, SC1 = 10K), and the process proceeds to STEP13.

In STEP 12, if the actual heat dissipation capacity q1 is smaller than the target heat dissipation capacity q0, the flow proceeds to STEP 14, otherwise the flow proceeds to STEP 13.

In STEP 14, it is determined that the heat radiation capacity of the heat radiation heat exchanger 8b is lower than the target value, and the target supercooling degree SC1 as the control target of the second flow valve RV2 during the cooling operation is set to the predetermined value b ( For example, b = 2K: That is, SC1 = 5
K), the correction is performed, and the process proceeds to STEP13.

Step 13 stops the operating timer and exits from the routine. In STEP 15, the supercooling degree detecting means 26 detects the actually measured supercooling degree SC (for example, SC = 7K) at the outlet of the heat-radiating heat exchanger 8b from the pressure sensor 17 and the thermistor 18, and
Move to

In STEP 16, the second flow valve driving means 2
7, by opening and closing the second flow valve RV2 so that the actually measured subcooling degree SC becomes the target subcooling degree SC1, the amount of circulating refrigerant passing through the heat exchanger 8b for heat radiation is increased or decreased, and the actual heat radiation capacity q1 is increased. Control.

As described above, STEP1 to STEP
The routine 16 is repeated during the operation of the air conditioner to correct the target supercooling degree SC1 according to the magnitude of the actual heat releasing capacity q1 with respect to the target heat releasing capacity q0. Also has an effect that control according to the target heat dissipation capacity q0 can be performed.

As described above, in the above embodiment, in the regenerative air conditioner, when the operation mode detecting means 19 detects the cooling operation in the cycle using the heat radiating heat exchanger 8b, the target supercooling degree calculation is performed. By means 21, the target supercooling degree S, which is the control target of the second flow valve RV2 during the cooling operation,
Calculate C1. Then, the first heat storage amount Q0 is detected by the heat storage amount calculating means 23 at the first predetermined time t1 detected by the time detecting means 22. The time detecting means 22
The second heat storage amount Q <b> 1 at the second predetermined time t <b> 2 is detected by the heat storage amount calculating means 23.

At this time, the first heat radiation amount calculating means 24
The actual heat dissipation capacity q1 of the heat dissipation heat exchanger 8b is calculated from the amounts of change in the heat storage amount Q0 and the second heat storage amount Q1, and the changes in the first and second predetermined times t1 and t2.

The actual heat dissipation capacity q1 is equal to the target heat dissipation capacity detection means 2.
When the target heat dissipation capacity q0 is smaller than the target heat dissipation capacity q0 detected by 0, the target supercooling degree correcting means 25 corrects the target supercooling degree SC1 downward, and performs control to reduce the actual heat dissipation capacity q1.

On the other hand, if the actual heat dissipation capacity q1 is larger than the target heat dissipation capacity q0, the target supercooling degree correction means 25 corrects the target supercooling degree SC1 upward, and the actual heat dissipation capacity q1 is increased.
Is controlled to increase.

With the above operation, the target heat dissipation capacity q
In order to correct the target supercooling degree SC1 according to the magnitude of the actual heat dissipation capacity q1 with respect to 0, a predetermined target supercooling degree S1 is determined.
Even when C1 is not appropriate, there is an effect that control according to the target heat dissipation capacity q0 can be performed.

Next, a regenerative air conditioner according to a second embodiment will be described. The second embodiment has the same configuration and the same operation as the first embodiment except for the third flow valve bypass RV3BP and the second control device CN2. Therefore, the third flow valve bypass RV3BP differs from the first embodiment. And the second control device C
The configuration and operation of N2 will be described.

FIG. 3 is a refrigeration cycle diagram of the second embodiment of the present invention. The regenerative air conditioner of the second embodiment is the third type.
The flow valve bypass RV3BP is provided so as to bypass the second flow valve RV2, the heat radiation heat exchanger 8b, and the two-way valve NV, and has a third flow valve RV3 on the way.

An operation mode detecting means 1 for detecting that the operation mode is the cooling operation mode using the heat exchanger 8b for heat radiation.
9, a target heat radiation capability detecting means 20 for calculating a target heat radiation capability q0 of the heat radiation heat exchanger 8b during the cooling operation, and a target flow valve opening X1 as a control target of the second flow valve RV2 during the cooling operation. The target flow valve opening degree calculating means 28 for calculating, the time detecting means 22 for detecting a predetermined time, the heat storage amount calculating means 23 for detecting the heat storage amount in the heat storage tank STR every predetermined time, and the change amount of the heat storage amount. Actual heat dissipation capacity q1 of heat exchanger 8b for heat dissipation
And a heat flow amount calculating means 24 for calculating the target flow valve opening X1
Subcooling degree correcting means 29 for correcting the pressure, and a third flow valve R
There is provided a second control device CN2 comprising third flow valve driving means 30 for opening and closing the third flow valve RV3 so that the opening of V3 matches the target flow valve opening X1.

Here, the water level sensor LM is shown as a specific example for detecting the amount of heat stored in the heat storage tank.

As described in the first embodiment, the setting for communication between the refrigerant-to-refrigerant heat exchanger HEX and the use-side heat exchangers 14a and 14b in the use-side refrigeration cycle is set to the second HE.
The X-circuit, the refrigerant-to-refrigerant heat exchanger HEX, the heat storage tank HEX, and the setting for communicating with the use-side heat exchangers 14a and 14b are set to a second setting.
(HEX + STR) circuit.

Next, the operation of the configuration of the second embodiment will be described. However, since the operation is the same as that of the first embodiment except for the operation of the two control device CN2, the description of the operation of each operation pattern is omitted. The operation of the second control device CN2 different from that of the first embodiment will be described with reference to the flowchart of FIG.

In STEP 1, the operation mode detecting means 19 detects whether or not the operation mode is the cooling operation mode using the heat dissipation heat exchanger 8b, and the cooling operation mode using the heat dissipation heat exchanger 8b. If not, the process proceeds to STEP2, and otherwise, the process exits the routine.

STEP 2 is a process for detecting the target heat radiation capacity detecting means 20.
Thus, in the so-called air-conditioning load prediction control for determining the heat radiation scheduling of the heat storage tank STR, the target heat radiation capacity q0 (for example, q0 = 10) of the heat radiation heat exchanger 8b during the cooling operation.
kW), and then proceeds to STEP3.

STEP 3 is the target flow valve opening degree calculating means 2
According to 8, the target flow valve degree X1 (for example, X1 = 700 pulses), which is the control target of the third flow valve RV3 during the cooling operation, is calculated, and then the process proceeds to STEP4. The target flow valve opening X1 is a predetermined value that is determined in advance corresponding to the target heat dissipation capacity q0.

At STEP 4, the time detecting means 22 detects whether or not the timer for detecting time has already been started, and if not, at STEP 5
The process proceeds to STEP7 if the process has already been started.

At STEP 5, the timer is started from t = 0, and the routine proceeds to STEP 7.

In STEP 6, the timer counts the heat storage amount Q0 (eg, Q0) during the first predetermined time t1 (eg, t1 = 0S).
= 10,000 kJ) and exits the routine.

In STEP 7, it is determined whether or not the timer has elapsed for a second predetermined time t2 (for example, t1 = 10 × 60S). If it has elapsed, the process proceeds to STEP 8, and if not, the process exits the routine. .

In STEP 8, the heat storage amount Q1 at t = t1
(For example, Q1 = 5000 kJ), and
Move to

In STEP 9, Q0 obtained in STEP 6
And Q1 obtained in STEP8 and the elapsed time t2-t1 by the following equation (1), the actual heat-dissipating capacity q1 of the heat-dissipating heat exchanger 8b at the elapsed time t2-t1 (for example, q1 =
8.3 kW), and the process proceeds to STEP 10.

In STEP 10, if the actual heat dissipation capacity q1 is larger than the target heat dissipation capacity q0, the process proceeds to STEP 11, otherwise the process proceeds to STEP 12. (For example, q1 <q
From STEP 0, the process proceeds to STEP 12. In STEP 11, the target subcooling degree correcting means 29 determines that the heat radiation capacity of the heat radiation heat exchanger 8b is higher than the target value, and thus controls the third flow valve RV3 during the cooling operation. Correction to increase the target target flow valve opening X1 by a predetermined value a (for example, a = 300 pulses: X1 = 1000
Pulse), and then proceeds to STEP13.

In STEP 12, if the heat radiation capacity of the heat radiation heat exchanger 8b is lower than the target value, STEP 14
Then, the others go to STEP15.

In STEP 14, the target subcooling degree correcting means 29 corrects the target flow valve opening X1, which is the control target of the third flow valve RV3 during the cooling operation, by a predetermined value b (for example, b = 200 pulses: X1 = 500 pulses)
And the process proceeds to STEP13.

At STEP 13, the running timer is stopped, and the routine goes to STEP 15.

In STEP 15, the third flow valve driving means 3
By opening and closing the third flow valve RV3 so that the third flow valve opening becomes the target flow valve opening X1 by 0, the refrigerant in the heat exchanger 8b for heat dissipation is bypassed to the third flow valve bypass RV3BP. This controls the actual heat dissipation capacity q1.

In this way, STEP 1 to STEP 1
By repeating the routine of 5 during the operation of the air conditioner, the target flow valve opening X1 is corrected in accordance with the magnitude of the actual heat release capability q1 with respect to the target heat release capability q0. In the case where the refrigerant is not appropriate, not only the control in accordance with the target heat radiation capacity q0 can be performed, but also the refrigerant flowing into the heat radiation heat exchanger 8b is supplied to the third flow valve bypass R.
Since the refrigerant circulation amount of the heat radiation heat exchanger 8b is controlled by bypassing to the V3BP, the control range of the refrigerant circulation amount is widened, and there is an effect that a wider heat radiation ability control can be performed.

[0095]

As described above, according to the present invention, in a regenerative air conditioner comprising a heat source side refrigeration cycle and a use side refrigeration cycle via a heat storage tank, a cooling operation mode using a heat radiating heat exchanger. Operating mode detecting means for detecting the operation mode, a target heat radiating capacity detecting means for calculating a target heat radiating capacity of the heat radiating heat exchanger in the cooling operation, and a second heat radiating capacity detecting means in the cooling operation.
Target supercooling degree calculating means for calculating a target supercooling degree which is a control target of the flow valve, time detecting means for detecting a predetermined time, and heat storage amount calculating means for detecting the heat storage amount in the heat storage tank at the predetermined time intervals Heat radiation amount calculating means for calculating the actual heat radiation capacity of the heat radiation heat exchanger from the change amount of the heat storage amount; target supercooling degree correcting means for correcting the target supercooling degree; and the heat radiation during cooling operation. A supercooling degree detecting means for detecting a measured supercooling degree at an outlet of the heat exchanger, and a second flow valve driving means for opening and closing the second flow valve so that the measured supercooling degree matches the target supercooling degree. And a first controller configured as described above.

If the actual heat dissipation capacity is smaller than the target heat dissipation capacity, the target supercooling degree correcting means performs a control to lower the target supercooling degree downward to increase the actual heat dissipation ability. On the other hand, if the actual heat dissipation capacity is larger than the target heat dissipation capacity, the target supercooling degree correcting means performs an upward correction on the target supercooling degree and performs control to decrease the actual heat dissipation capacity.

With the above operation, even when the amount of stored heat is small or the refrigerant possessed by the use-side refrigeration cycle is unevenly distributed, the target supercooling degree is corrected as needed and the refrigerant flowing into the heat-radiating heat exchanger. Since the amount of heat radiation is adjusted appropriately by controlling the amount of circulation, the operation always follows the air-conditioning load prediction control, the heat radiation capacity required at the time of peak load can be secured, and operation utilizing the advantages of the regenerative air conditioner There is an effect that can be.

Another aspect of the present invention is a heat storage type air conditioner comprising a heat source side refrigeration cycle and a use side refrigeration cycle via a heat storage tank, wherein the second flow valve and the heat radiating heat exchanger are connected to each other. A third valve having a third flow valve bypassing the one-way valve
A flow valve bypass, the operation mode detecting means for detecting a cooling operation mode using the heat exchanger for heat dissipation, and the target heat dissipation capacity of the heat exchanger for heat dissipation during cooling operation. The target heat radiation capability detecting means for calculating, the target flow valve opening calculating means for calculating a target flow valve opening degree which is a control target of the third flow valve during the cooling operation, and the time detecting means for detecting a predetermined time And, the heat storage amount calculating means for detecting the heat storage amount in the heat storage tank at every predetermined time, and the heat release amount calculating means for calculating the actual heat release capability of the heat radiation heat exchanger from the change amount of the heat storage amount, Target flow valve opening correction means for correcting the target flow valve opening, and a third flow valve drive for opening and closing the third flow valve so that the opening of the third flow valve matches the target flow valve opening And a second control device comprising means.

When the actual heat radiation capacity is smaller than the target heat radiation capacity detected by the target heat radiation capacity detecting means, the target flow valve opening degree is corrected downward by the target flow valve opening correction means. Accordingly, the amount of the circulating refrigerant passing through the heat exchanger for heat radiation increases by the amount of the circulation of the refrigerant bypassing the heat exchanger for heat radiation, thereby increasing the actual heat radiation capacity.

On the other hand, when the actual heat radiation capacity is larger than the target heat radiation capacity, the target flow valve opening correction means corrects the target flow valve opening upward by the target flow valve opening correction means, thereby increasing the internal temperature of the heat radiation heat exchanger. The amount of the circulating refrigerant passing through the heat exchanger for heat dissipation is reduced by the amount of the amount of the circulating refrigerant bypassing the heat exchanger, thereby reducing the actual heat dissipation capacity.

By the above operation, even when the amount of stored heat is small or the refrigerant possessed by the use-side refrigeration cycle is unevenly distributed, the target flow valve opening is corrected as needed and flows into the heat-radiating heat exchanger. Control the amount of refrigerant circulation to properly adjust the amount of heat radiation. Therefore, the operation always follows the air-conditioning load prediction control, the heat radiation capacity required at the time of peak load can be secured, and the operation utilizing the advantages of the regenerative air conditioner can be performed. Since the heat-radiating heat exchanger is bypassed by the flow valve bypass, the control width of the refrigerant circulation amount becomes wider as compared with the case where the third flow valve bypass is not provided. Have both.

[Brief description of the drawings]

FIG. 1 is a refrigeration system diagram of a regenerative air conditioner according to a first embodiment of the present invention.

FIG. 2 is an operation flowchart of a first control device of the embodiment.

FIG. 3 is a refrigeration system diagram of a regenerative air conditioner according to a second embodiment of the present invention.

FIG. 4 is an operation flowchart of a second control device of the embodiment.

FIG. 5 is a refrigeration system diagram of a regenerative air conditioner showing a conventional example.

[Explanation of symbols]

 2 Compressor 3a First four-way valve 3b Second four-way valve 4 Heat source side heat exchanger 5a First expansion valve 5b Second expansion valve 7a First auxiliary heat exchanger 7b Second auxiliary heat exchanger 8a Heat storage heat exchanger 8b Heat exchanger for heat radiation 9 Heat storage material 11 Refrigerant tank 13a, 13b Indoor unit 14a, 14b Usage side heat exchanger 15a, 15b Indoor flow valve 19 Operating mode detecting means 20 Target heat radiation capacity detecting means 21 Target supercooling degree calculating means 22 hours Detecting means 23 heat storage amount calculating means 24 heat radiation amount calculating means 25 target supercooling degree correcting means 26 supercooling degree detecting means 27 second flow valve driving means 28 target flow valve opening calculating means 29 target flow valve opening correcting means 30 3 Flow valve drive means PU Pump unit STR Heat storage tank HEX Refrigerant to refrigerant heat exchanger PM Liquid refrigerant transport pump RV1 First flow valve RV2 Second flow RV3 third flow valve RV3BP third flow valve bypass NV 2-way valve CN1 first controller CN2 second control device

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25B 13/00 F25B 1/00

Claims (2)

(57) [Claims] 1. A refrigerant-to-refrigerant heat exchanger comprising a compressor, a first four-way valve, a heat source side heat exchanger, a first expansion valve, a first auxiliary heat exchanger and a second auxiliary heat exchanger. And the first auxiliary heat exchanger is sequentially connected in a ring shape, and the second expansion valve and the heat storage heat exchanger of the heat storage tank including the heat storage heat exchanger, the heat radiation heat exchanger, and the heat storage material are connected in series. A heat-source-side refrigeration cycle connected in parallel to a serially connected part of the first expansion valve and the first auxiliary heat exchanger of the refrigerant-to-refrigerant heat exchanger; A pump unit including a valve and a refrigerant tank, a plurality of indoor units including an indoor flow valve and a use side heat exchanger, and a unit in which the second auxiliary heat exchanger and the first flow valve are connected in series. On the other hand, a two-way valve, a heat exchanger for radiating heat and a second flow valve connected in series are connected in parallel. Operating mode detecting means for detecting a cooling operation mode using the heat radiating heat exchanger, and a heat radiating cycle during cooling operation. A target heat radiation capacity detecting means for calculating a target heat radiation capacity of the heat exchanger; and a target supercooling degree for calculating a target supercooling degree at an outlet of the heat radiation heat exchanger which is a control target of the second flow valve during a cooling operation. Calculating means, time detecting means for detecting a predetermined time, heat storage amount calculating means for detecting the amount of heat stored in the heat storage tank at every predetermined time, and actual heat dissipation of the heat-radiating heat exchanger from the amount of change in the heat storage amount. Means for calculating the amount of heat dissipation, means for calculating the capacity, means for detecting the degree of supercooling at the outlet of the heat exchanger for heat dissipation during cooling operation, means for detecting the degree of supercooling, and means for correcting the target degree of supercooling, the means for correcting the target degree of supercooling And the measured degree of subcooling is the target A first control device comprising a second flow valve driving means for opening and closing the second flow valve so as to coincide with the cooling degree, and the heat radiation heat exchanger detected by the operation mode detection means. In the cooling operation in the cycle using, the target supercooling degree calculating means calculates a target supercooling degree at the heat-radiating heat exchanger outlet as a control target of the second flow valve during the cooling operation, and calculates the time. The first heat storage amount in the first predetermined time detected by the detection means is detected by the heat storage amount calculation means, and the second heat storage amount in the second predetermined time detected by the time detection means is detected by the heat storage amount calculation means. The heat radiation amount calculating means calculates the actual value of the heat radiation heat exchanger from the change amounts of the first heat storage amount and the second heat storage amount and the change amounts of the first predetermined time and the second predetermined time. Calculating the heat capacity, and when the actual heat dissipation capacity is smaller than the target heat dissipation capacity, the target supercooling degree correcting means corrects the target supercooling rate downward, while the actual heat dissipation capacity is larger than the target heat dissipation capacity. In this case, the target supercooling degree is corrected upward by the target supercooling degree correcting means, and the actually measured supercooling degree at the outlet of the heat radiation heat exchanger coincides with the target supercooling degree by the second flow valve driving means. A heat storage type air conditioner characterized by opening and closing the second flow valve so as to perform the operation. 2. A refrigerant-to-refrigerant heat exchanger comprising a compressor, a first four-way valve, a heat source side heat exchanger, a first expansion valve, a first auxiliary heat exchanger and a second auxiliary heat exchanger. And the first auxiliary heat exchanger is sequentially connected in a ring shape, and the second expansion valve and the heat storage heat exchanger of the heat storage tank including the heat storage heat exchanger, the heat radiation heat exchanger, and the heat storage material are connected in series. A heat-source-side refrigeration cycle connected in parallel to a serially connected part of the first expansion valve and the first auxiliary heat exchanger of the refrigerant-to-refrigerant heat exchanger; A pump unit comprising a valve and a refrigerant tank, a plurality of indoor units comprising an indoor flow valve and a use-side heat exchanger, and a unit in which the second auxiliary heat exchanger and the first flow valve are connected in series. The two-way valve, the heat exchanger for heat radiation and the second flow valve connected in series are connected in parallel. Preparative constituted by connecting in a ring, the second
A use-side refrigeration cycle having a third flow valve bypass provided with a third flow valve bypassing the flow valve, the heat radiation heat exchanger, and the two-way valve, and using the heat radiation heat exchanger; Operating mode detecting means for detecting that the cooling operation mode is to be performed, target heat radiating capacity detecting means for calculating a target heat radiating capacity of the heat radiating heat exchanger at the time of cooling operation, and the second cooling mode at the time of cooling operation. (3) Target flow valve opening calculating means for calculating a target flow valve opening which is a control target of the flow valve, time detecting means for detecting a predetermined time, and heat storage for detecting the amount of heat stored in the heat storage tank at every predetermined time An amount calculating unit, a radiating amount calculating unit that calculates an actual radiating capacity of the radiating heat exchanger from a change amount of the heat storage amount, a target flow valve opening correction unit that corrects the target flow valve opening, The opening of the third flow valve matches the target flow valve opening. And a second control device comprising a third flow valve driving means for opening and closing the third flow valve. The second control device comprises a third flow valve driving means for opening and closing the third flow valve, and a cycle using the heat radiation heat exchanger detected by the operation mode detecting means. In the cooling operation, the target flow valve opening degree as a control target of the third flow valve during the cooling operation is calculated by the target flow valve opening calculation means,
A first heat storage amount for a first predetermined time detected by the time detecting means is detected by the heat storage amount calculating means;
A second heat storage amount for a second predetermined time detected by the time detecting means is detected by the heat storage amount calculating means;
The first heat storage amount and the second heat storage amount are calculated by the heat release amount calculating means.
Calculating the actual heat dissipation capacity of the heat exchanger for heat dissipation from the change amount of the heat storage amount and the change amount of the first predetermined time and the second predetermined time, and when the actual heat dissipation capacity is smaller than the target heat dissipation capacity, Corrects the target flow valve opening downward by the target flow valve opening correction means, while if the actual heat radiation capacity is larger than the target heat radiation capacity, the target flow valve opening correction means corrects the target flow valve opening. The third flow valve is opened and closed by the third flow valve driving means so that the opening of the third flow valve matches the target flow valve opening. .