JP2000356428A - Heat storage air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lengthen heat storage maintaining time in daytime heat storage utilization heating by increasing a heating heat storage amount in winter. SOLUTION: A heat storage air conditioner is adapted such than an electrical heating apparatus 21 is disposed on a heat storage tank 3 for heating a heat storage member 4, and the heat storage member 4 is heated by heat radiation of a heat storage heat exchanger 15 upon heating heat storage in the night in winter, and simultaneously the heat storage member 4 is heated with the electrical heating apparatus 21 above condensation temperature of the heat storage heat exchanger 15. Thus, a heating heat storage amount is increased and hence heating heat storage amount useable in daytime heat storage utilization heating is increased, and hence sufficient heating capability is ensured by lengthening heat storage maintaining time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage type air conditioner for storing heat energy in a heat storage tank by nighttime electric power and performing cooling and heating using the heat energy stored in the heat storage tank in the daytime.

[0002]

2. Description of the Related Art In recent years, regenerative air conditioners have been rapidly spreading for the purpose of leveling the power load and saving energy.

A conventional regenerative air conditioner is disclosed in Japanese Patent Application Laid-Open No. 6-82114.

Hereinafter, the above-mentioned conventional regenerative air conditioner will be described with reference to the drawings.

FIG. 6 is a system diagram of a conventional regenerative air conditioner. In FIG. 6, 1 is a compressor, 2 is a four-way valve, 3 is a heat storage tank having a heat exchanger, and 4 is a heat storage material stored in the heat storage tank 3. 5 is a branch pipe from the gas pipe to the heat storage tank 3, 6 is a first solenoid valve, 7a and 7b are expansion valves, 8 is a branch pipe from the heat storage tank 3 to the liquid pipe, and 9 is an outdoor heat exchanger. Reference numeral 10 denotes a second solenoid valve, 11 denotes a third solenoid valve, and 12 denotes an indoor heat exchanger.

A conventional regenerative air conditioner includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 9, a second solenoid valve 10, and an expansion valve 7.
a, the indoor heat exchanger 12 is sequentially connected in a ring shape, and one end of the heat exchanger in the heat storage tank 3 is connected to the indoor heat exchanger 12 and the four-way valve via a branch pipe 5 having a first solenoid valve 6 in the middle. 2 and a branch pipe having a third solenoid valve 11 on the way to a pipe between the second solenoid valve 10 and the expansion valve 7a. Connect the other end of the heat exchanger
It is connected to a pipe between the outdoor heat exchanger 9 and the second solenoid valve 10 via a branch pipe 8 having an expansion valve 7b on the way.

The operation of the conventional heat storage type air conditioner configured as described above will be described below.

At the time of heating heat storage in winter night, first, the high-temperature refrigerant gas discharged from the compressor 1 passes through the four-way valve 2 from the gas pipe to the branch pipe 5 to the heat storage tank 3 and the first solenoid valve 6. , Heat is condensed from the heat exchanger in the heat storage tank 3 to the heat storage material 4 stored in the heat storage tank 3, condensed, heated and stored in the heat storage tank 3, decompressed by the expansion valve 7 b, and then passed through the branch pipe 8. The heat is absorbed and evaporated in the outdoor heat exchanger 9 and returns to the compressor 1 via the four-way valve 2. The second solenoid valve 10 and the third solenoid valve 11 are fully closed, and no refrigerant flows through the indoor heat exchanger 12.

Further, during heating using heat storage during the daytime in winter when the outside air temperature is low, the first solenoid valve 6 and the second solenoid valve 10 are fully closed, and the high-temperature refrigerant discharged by the compressor 1 is discharged. The gas is radiated and condensed from the gas pipe through the indoor heat exchanger 12 via the four-way valve 2 to heat and heat the room by utilizing the heat stored therein, and after the pressure is reduced by the expansion valve 7a, a branch having a third solenoid valve 11 on the way. The heat is absorbed and evaporated from the heat storage material 4 stored in the heat storage tank 3 in the heat exchanger in the heat storage tank 3 through the pipe, passes through the expansion valve 7, the branch pipe 8, passes through the outdoor heat exchanger 9, and flows through the four-way valve 2.
And returns to the compressor 1.

At this time, since the heat of the heat storage tank 3 is used as the evaporator side, the suction pressure of the compressor 1 is increased, and the operation state becomes efficient.

[0011]

However, in the above-mentioned conventional configuration, the temperature of the heat storage material 4 in the heat storage tank 3 can be increased only to the condensing temperature of the refrigeration cycle or less during the heating heat storage, and the heating heat storage amount is small. Therefore, there is a disadvantage that the heat storage maintenance time is short in daytime heat storage heating heating.

The present invention solves the conventional problems.
An object of the present invention is to increase the amount of heat storage in winter to extend the heat storage maintenance time in daytime heat storage heating.

[0013]

According to the present invention, in order to achieve this object, an electric heating device for heating a heat storage material at the time of heating and storing heat in winter night is provided in the heat storage tank.

Thus, the heat storage amount can be increased, and the heat storage maintenance time can be extended in daytime heat storage heating.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An invention according to claim 1 of the present invention is a heat storage tank in which a compressor, a four-way valve, an outdoor heat exchanger, a second expansion valve mechanism, and an indoor heat exchanger are sequentially connected in a ring shape. One end of the heat storage heat exchanger housed together with the heat storage material is connected to a pipe between the indoor heat exchanger and the four-way valve via a first electromagnetic valve, and is connected via a second electromagnetic valve. Connected to a pipe between the outdoor heat exchanger and the second expansion valve mechanism,
The other end of the heat storage heat exchanger is connected to a pipe between the second expansion valve mechanism and the indoor heat exchanger via a first expansion valve mechanism, and the heat storage material is used when heating and storing heat during winter night. An electric heat device for heating the heat storage material is provided in the heat storage tank, and the temperature of the heat storage material is set to be equal to or higher than the condensing temperature of the refrigeration cycle by the electric heat device provided in the heat storage tank at the time of heating heat storage in winter night. By increasing the amount of heating heat storage that can be stored per unit volume, the amount of heating heat storage can be increased, and therefore the amount of heating heat storage that can be used in daytime heat storage heating increases, and the required heating by increasing the heat storage maintenance time It has the effect that the capacity can be maintained and a sufficient heating capacity can be secured.

[0016] The invention described in claim 2 of the present invention provides:
The compressor, the four-way valve, the outdoor heat exchanger, the second expansion valve mechanism, and the indoor heat exchanger are sequentially connected in a ring shape, and one end of the heat storage heat exchanger housed together with the heat storage material in the heat storage tank is connected to the first heat storage heat exchanger. A pipe connected between the indoor heat exchanger and the four-way valve via a solenoid valve, and a pipe connected between the outdoor heat exchanger and the second expansion valve mechanism via a second solenoid valve And the other end of the heat storage heat exchanger is connected to a pipe between the second expansion valve mechanism and the indoor heat exchanger via a first expansion valve mechanism to heat the heat storage material. The heat storage device is disposed in the heat storage tank, and during heat storage during winter nights, the heat storage material is heated by the heat of the heat storage heat exchanger, and the heat storage material is condensed by the heat storage device by the heat storage device. It is configured to heat to a temperature higher than the temperature. By radiating and condensing heat on the heat storage material as a condenser for the freezing cycle and using it together with the heat storage device to heat and store heat in the heat storage material, the heating heat storage amount can be further increased within the limited heating heat storage time, and therefore during the daytime The amount of heating heat storage that can be used in the heat storage utilizing heating increases, and by increasing the heat storage maintaining time, the required heating capacity can be maintained and sufficient heating capacity can be secured.

[0017] The invention according to claim 3 of the present invention provides:
In the invention according to claim 2, the heat storage material temperature detecting means for detecting the temperature of the heat storage material, the condensing temperature detecting means for detecting the condensing temperature of the refrigerant discharged from the compressor, and the heat storage heat during winter night, Heating heat storage control means for controlling the operation of the refrigeration cycle and the operation of the electric heating device based on the temperature of the heat storage material detected by the heat storage material temperature detection means and the condensation temperature detected by the condensation temperature detection means, The heating heat storage control unit is configured to execute the refrigeration cycle until the temperature of the heat storage material detected by the heat storage material temperature detection unit falls within a predetermined temperature range lower than the condensation temperature detected by the condensation temperature detection unit and close to the condensation temperature. Operate both the and the electric heating device, stop only the electric heating device when entering the predetermined temperature range, stop the operation of the refrigeration cycle when exceeding the upper limit temperature of the predetermined temperature range. Serial is intended to operate only the electric heating device, in addition to the effect of the invention according to claim 2, further
For a certain period when the temperature of the heat storage material is close to the condensing temperature of the refrigeration cycle, the electric heating device is temporarily stopped, and after the refrigeration cycle reaches the condensing temperature and stopped, the heat storage material is heated again by the electric heating device to perform heating heat storage. This has the effect that the maximum power consumption of the regenerative air conditioner during heating heat storage can be reduced.

Further, the invention according to claim 4 of the present invention provides:
In the invention according to claim 2, a plurality of electric heat devices are provided in the heat storage tank, and a heat storage material temperature detecting means for detecting a temperature of the heat storage material, and a condensing temperature detection for detecting a condensing temperature of the refrigerant discharged from the compressor. Means, during heating heat storage in winter night, based on the temperature of the heat storage material detected by the heat storage material temperature detection means and the condensation temperature detected by the condensation temperature detection means, the operation of the refrigeration cycle and the plurality of the electric heating device Heating and heat storage control means for controlling the operation and the heating and heat storage control means, wherein the temperature of the heat storage material detected by the heat storage material temperature detection means is lower than the condensation temperature detected by the condensation temperature detection means. When the temperature is equal to or less than a predetermined temperature, the refrigeration cycle and a part of the plurality of electric heating devices are operated, and when the temperature exceeds the predetermined temperature, the operation of the refrigeration cycle is stopped and the plurality of the electric heating devices are operated. All It is a thing that operates, and when heating and storing heat in the winter night, the heat storage heat exchanger is radiated and condensed on the heat storage material as a condenser of the refrigeration cycle, and by using it together with multiple electric heating devices, the heat is stored in the heat storage material, Within the limited heating heat storage time, the heating heat storage amount can be further increased, so that the heating heat storage amount that can be used in daytime heat storage use heating increases, and the necessary heating capacity can be maintained by extending the heat storage maintenance time, Sufficient heating capacity can be secured.

Still further, after a part of the plurality of electric heating devices heats the heat storage material to perform heating and heat storage, and after the refrigerating cycle reaches the condensing temperature and stops, the heat storage material is heated and heated and stored in all the electric heating devices. Has the effect of reducing the maximum power consumption of the regenerative air conditioner during heating and storage.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a regenerative air conditioner according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a refrigeration cycle diagram of a regenerative air conditioner according to Embodiment 1 of the present invention.

In FIG. 1, 1 is a compressor, 2 is a four-way valve, 9 is an outdoor heat exchanger, and 12 is an indoor heat exchanger. Reference numeral 13 denotes a liquid pipe, and 14 denotes a gas pipe. Reference numeral 15 denotes a heat storage heat exchanger provided in a bypass circuit between the liquid pipe 13 and the gas pipe 14. Reference numeral 3 denotes a heat storage tank containing the heat storage heat exchanger 15, and reference numeral 4 denotes a heat storage material stored in the heat storage tank 3. 16
Is a first expansion valve mechanism disposed between the liquid pipe 13 and the heat storage heat exchanger 15, and 17 is a gas pipe 14 and the heat storage heat exchanger 15.
1 is a first solenoid valve for switching a circuit disposed between the first solenoid valve and the first solenoid valve. 18
Reference numeral 19 denotes a branch pipe that branches from a pipe between the gas pipe 14 and the heat storage heat exchanger 15 and is connected to the liquid pipe 13. Reference numeral 19 denotes a second solenoid valve for circuit switching provided in the branch pipe 18. Reference numeral 20 denotes a second expansion valve mechanism disposed on the liquid pipe 13 between the first expansion valve mechanism 16 and a connection point of the branch pipe 18 with the liquid pipe 13. Reference numeral 21 denotes an electric heating device that heats the heat storage material 4 disposed in the heat storage tank 3.

The regenerative air conditioner according to the first embodiment includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 9, and a second expansion valve mechanism 2.
0, the indoor heat exchangers 12 are sequentially connected in a ring shape, and one end of the heat storage heat exchanger 15 housed in the heat storage tank 3 together with the heat storage material 4 is connected to the indoor heat exchanger 12 via the first electromagnetic valve 17. The second solenoid valve 1 is connected to a pipe between the four-way valve 2 and the second solenoid valve 1.
9 is connected to the pipe between the outdoor heat exchanger 9 and the second expansion valve mechanism 20, and the other end of the heat storage heat exchanger 15 is connected to the second expansion valve via the first expansion valve mechanism 16. An electric heating device 21 that is connected to a pipe between the valve mechanism 20 and the indoor heat exchanger 12 and that heats the heat storage material 4 when heating and storing heat during winter night is provided in the heat storage tank 3.

The operation of the regenerative air conditioner configured as described above will be described below.

At the time of heating heat storage in winter night, the heat storage material 4 is heated by the electric heating device 20 disposed in the heat storage tank 3 to perform heating heat storage. This makes the temperature of the heat storage material 4 equal to or higher than the condensing temperature of the refrigeration cycle and increases the amount of heating heat storage that can be stored per unit volume of the heat storage material 4, thereby increasing the heating heat storage amount.

At the time of daytime heating using heat storage, the high-temperature refrigerant gas discharged from the compressor 1 passes through the four-way valve 2,
After the heat is condensed and heated in the indoor heat exchanger 12, the first heat
The expansion valve mechanism 16 decompresses and expands, and the heat storage heat exchanger 15 is used as an evaporator to evaporate and absorb heat from the heat storage material 4 to utilize the heat storage. The branch pipe 18 passes through the second solenoid valve 19 to the outdoor heat exchanger 9.
To the compressor 1 via the four-way valve 2.

At this time, the amount of heat storage that can be used for heat storage increases, and the required heating capacity can be maintained by extending the heat storage maintenance time, so that sufficient heating capacity can be secured.

As described above, in the regenerative air conditioner of this embodiment, the compressor 1, the four-way valve 2, the outdoor heat exchanger 9, the second expansion valve mechanism 20, and the indoor heat exchanger 12 are sequentially connected in a ring shape. The heat storage heat exchanger 15 housed in the heat storage tank 3 together with the heat storage material 4
Of the indoor heat exchanger 12 through the first solenoid valve 17.
And the outdoor heat exchanger 9 and the second expansion valve mechanism 2 via a second solenoid valve 19.
0, and the other end of the heat storage heat exchanger 15
An electric heating device 21 that is connected to a pipe between the second expansion valve mechanism 20 and the indoor heat exchanger 12 via the first expansion valve mechanism 16 and that heats the heat storage material 4 during heating and storage during winter nights. Since the heat storage material 4 is disposed in the tank 3, the temperature of the heat storage material 4 is set to be equal to or higher than the condensing temperature of the refrigeration cycle by the electric heating device 21 disposed in the heat storage tank 3 at the time of heating heat storage in winter night, and By increasing the amount of heat storage that can be stored, the amount of heat storage can be increased, and thus the amount of heat storage that can be used in daytime heat storage heating increases, and the required heating capacity can be maintained by extending the heat storage maintenance time. Sufficient heating capacity can be secured. (Embodiment 2) Next, a regenerative air conditioner according to Embodiment 2 of the present invention will be described. A refrigeration cycle diagram of the regenerative air conditioner according to Embodiment 2 is based on Embodiment 1 shown in FIG. This is the same as the refrigerating cycle diagram of the regenerative air conditioner, except that the heat storage material 4 is heated by the heat radiation of the heat storage heat exchanger 15 and the heat storage material 4 is stored by the electric heat device 21 at the time of the winter heat storage. Example 1 differs from Example 1 in the operation at the time of heating and storing heat in winter nights in that the heating is performed at a temperature of 15 or more.

At the time of heat storage during winter night, the high-temperature refrigerant gas discharged from the compressor 1 is distributed to the inside of the heat storage tank 3 via the four-way valve 2, the gas pipe 14, the first solenoid valve 17, and the like. After the heat is condensed and stored in the heat storage material 4 in the heat storage heat exchanger 15 provided for heating and heat storage, the pressure is reduced by the second expansion valve mechanism 20 through the first expansion valve mechanism 16 which is fully opened, and then the outdoor heat exchanger 9 , And returns to the compressor 1 via the four-way valve 2.

At this time, the second solenoid valve 19 is closed.
Further, the heat storage material 4 is heated by the electric heating device 21 disposed in the heat storage tank 3 to perform heating and heat storage together with the heat storage of the refrigeration cycle.

Thus, when the heat storage is performed during the winter night, the heat storage heat exchanger 15 is used as a condenser of the refrigeration cycle when the heat storage material 4 is used.
The heat storage material 4 is condensed by the heat storage
By increasing the temperature of the heat storage material 4 to the condensing temperature of the refrigeration cycle within a limited heating heat storage time by increasing the heat storage time, the amount of heat storage that can be stored per unit volume of the heat storage material 4 is increased. Further, the heat storage amount can be increased.

At the time of daytime heating using heat storage, the high-temperature refrigerant gas discharged from the compressor 1 passes through the four-way valve 2,
After the heat is condensed and heated in the indoor heat exchanger 12, the first heat
The expansion valve mechanism 16 decompresses and expands, and the heat storage heat exchanger 15 is used as an evaporator to evaporate and absorb heat from the heat storage material 4 to utilize the heat storage. The branch pipe 18 passes through the second solenoid valve 19 to the outdoor heat exchanger 9.
To the compressor 1 via the four-way valve 2.

At this time, the amount of heating heat storage that can be used for heat storage is further increased, and the necessary heating capacity can be maintained by extending the heat storage maintaining time, so that sufficient heating capacity can be secured.

As described above, in the regenerative air conditioner of this embodiment, the compressor 1, the four-way valve 2, the outdoor heat exchanger 9, the second expansion valve mechanism 20, and the indoor heat exchanger 12 are sequentially connected in a ring shape. The heat storage heat exchanger 15 housed in the heat storage tank 3 together with the heat storage material 4
Of the indoor heat exchanger 12 through the first solenoid valve 17.
And the outdoor heat exchanger 9 and the second expansion valve mechanism 2 via a second solenoid valve 19.
0, and the other end of the heat storage heat exchanger 15
An electric heating device 21 that is connected to a pipe between the second expansion valve mechanism 20 and the indoor heat exchanger 12 via the first expansion valve mechanism 16 and heats the heat storage material 4 is provided in the heat storage tank 3, By heating the heat storage material 4 by heat radiation of the heat storage heat exchanger 15 and heating the heat storage material 4 by the electric heating device 21 to a temperature equal to or higher than the condensing temperature of the heat storage heat exchanger 15 at the time of heating and storing in winter night, Within the specified heating heat storage time, the heating heat storage amount can be further increased, so that the heating heat storage amount that can be used in daytime heat storage use heating increases, and the necessary heating capacity can be maintained by extending the heat storage maintenance time, and Heating capacity can be secured.

(Embodiment 3) FIG. 2 is a configuration diagram of a regenerative air conditioner according to Embodiment 3 of the present invention. FIG. 3 is a flowchart showing the operation of the embodiment. In the present embodiment, the same components as those of the first or second embodiment are denoted by the same reference numerals, and the detailed description thereof will be omitted.

In FIG. 2, reference numeral 22 denotes a heat storage material temperature detecting means for detecting the temperature of the heat storage material 4; 23, a compressor operating state detecting means for detecting the operating state of the compressor 1;
Is a condensation temperature detecting means for detecting the condensation temperature. 25
Is a heating and heat storage control means for controlling the compressor 1 and the electric heating device 21 by using the heat storage material temperature detecting means 22, the compressor operating state detecting means 23, and the condensing temperature detecting means 24 as inputs.

The regenerative air conditioner according to the third embodiment includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 9, and a second expansion valve mechanism 2.
0, the indoor heat exchangers 12 are sequentially connected in a ring shape, and one end of the heat storage heat exchanger 15 housed in the heat storage tank 3 together with the heat storage material 4 is connected to the indoor heat exchanger 12 via the first electromagnetic valve 17. The second solenoid valve 1 is connected to a pipe between the four-way valve 2 and the second solenoid valve 1.
9 is connected to the pipe between the outdoor heat exchanger 9 and the second expansion valve mechanism 20, and the other end of the heat storage heat exchanger 15 is connected to the second expansion valve via the first expansion valve mechanism 16. In the configuration of the heat storage type air conditioner according to the second embodiment in which an electric heating device 21 for heating the heat storage material 4 is connected to a pipe between the valve mechanism 20 and the indoor heat exchanger 12 and disposed in the heat storage tank 3, 4, a heat storage material temperature detecting means 22 for detecting the temperature of the compressor 4, a compressor operating state detecting means 23 for detecting an operating state of the compressor 1, and a condensing temperature detecting means for detecting a condensing temperature of the refrigerant discharged from the compressor 1. 2
4 and a heat storage material temperature detecting means 2 for heating and storing heat during winter nights.
Refrigeration cycle (compressor 1) based on the temperature of heat storage material 4 detected in 2 and the condensation temperature detected in condensation temperature detecting means 24.
And the heating heat storage control means 25 for controlling the operation of the electric heating device 21.

The heating and heat storage control means 25 controls the temperature of the heat storage material 4 detected by the heat storage material temperature detection means 22 to fall within a predetermined temperature range lower than the condensation temperature detected by the condensation temperature detection means 24 and close to the condensation temperature. Up to this point, both the refrigeration cycle (compressor 1) and the electric heating device 21 are operated, and when the temperature falls within a predetermined temperature range, only the operation of the electric heating device 21 is stopped, and when the temperature exceeds the upper limit temperature of the predetermined temperature range, the refrigeration cycle ( The operation of the compressor 1) is stopped and only the electric heating device 21 is operated.

The operation of the regenerative air conditioner configured as described above will be described below with reference to the flowchart of FIG.

First, after the heating and heat storage operation is started, Step 01
Detects the heat storage material temperature Tw. In step 02, the condensation temperature Tc is detected. In step 03, if the heat storage material temperature Tw detected in step 01 is lower than a value obtained by subtracting a predetermined temperature difference ΔT1 (for example, 5K) from the condensation temperature Tc detected in step 02, the process proceeds to step 08; otherwise, the process proceeds to step 04. move on.

In step 08, the refrigeration cycle is operated.
In step 09, the electric heating device is operated, and the process proceeds to step 10.

In step 04, if the heat storage material temperature Tw is higher than the first predetermined temperature T2 (for example, 45 ° C.), step 0 is executed.
Go to step 5, otherwise go to step 06. In step 05, the refrigeration cycle is stopped, and the process proceeds to step 09.

In step 06, the refrigeration cycle is operated.
In step 07, the electric heating device is stopped and the process proceeds to step 10.

In step 10, the temperature Tw of the heat storage material detected in step 01 is changed to a second predetermined temperature T3 (for example, 55 ° C.).
If so, proceed to step 11; otherwise, return to step 01. In step 11, the electric heating device is stopped, and the heating and heat storage operation ends.

In the regenerative air conditioner of the present embodiment, the heat storage material temperature Tw is set to the first predetermined temperature T2 during the heating and heat storage in winter night.
The heat storage heat exchanger 15 is used as a condenser of the refrigeration cycle until the heat storage material 4 is radiated and condensed on the heat storage material 4.

Thus, within a limited heating heat storage time,
By setting the temperature of the heat storage material 4 to be equal to or higher than the condensation temperature of the refrigeration cycle,
By increasing the heating heat storage amount that can store heat per unit volume of the heat storage material 4, the heating heat storage amount can be increased.

At the time of heating using heat storage in the daytime, high-temperature refrigerant gas discharged from the compressor 1 passes through the four-way valve 2,
After the heat is condensed and heated in the indoor heat exchanger 12, the first heat
The expansion valve mechanism 16 decompresses and expands, and the heat storage heat exchanger 15 is used as an evaporator to evaporate and absorb heat from the heat storage material 4 to utilize the heat storage. The branch pipe 18 passes through the second solenoid valve 19 to the outdoor heat exchanger 9.
To the compressor 1 via the four-way valve 2.

At this time, the amount of heat storage that can be used for heat storage increases, and the required heating capacity can be maintained by extending the heat storage maintenance time, so that sufficient heating capacity can be secured.

Further, the heat storage material temperature Tw is equal to or lower than the first predetermined temperature T2 for stopping the refrigeration cycle, and the condensing temperature T
c is higher than a value obtained by subtracting a predetermined temperature difference ΔT1, that is, the refrigeration cycle is operating near the condensing temperature, the condensing pressure on the refrigeration cycle is high, the compression ratio of the compressor 1 is high, and By stopping the operation of the electric heating device 21 when the power consumption of 1 is high, the maximum power consumption of the regenerative air conditioner can be reduced.

As described above, in the regenerative air conditioner of this embodiment, the compressor 1, the four-way valve 2, the outdoor heat exchanger 9, the second expansion valve mechanism 20, and the indoor heat exchanger 12 are sequentially connected in a ring shape. The heat storage heat exchanger 15 housed in the heat storage tank 3 together with the heat storage material 4
Of the indoor heat exchanger 12 through the first solenoid valve 17.
And the outdoor heat exchanger 9 and the second expansion valve mechanism 2 via a second solenoid valve 19.
0, and the other end of the heat storage heat exchanger 15
Heat storage connected to a pipe between the second expansion valve mechanism 20 and the indoor heat exchanger 12 via the first expansion valve mechanism 16 and provided in the heat storage tank 3 with an electric heating device 21 for heating the heat storage material 4. In the air conditioner, the heat storage material temperature detection means 22 for detecting the temperature of the heat storage material 4, the compressor operation state detection means 23 for detecting the operation state of the compressor 1, and the refrigerant discharged from the compressor 1 Condensation temperature detection means 24 for detecting the condensation temperature of
At the time of heating and storing heat during the winter night, the operation of the refrigeration cycle (compressor 1) and the electric heating device 21 are performed based on the temperature of the heat storage material 4 detected by the heat storage material temperature detecting means 22 and the condensing temperature detected by the condensing temperature detecting means 24. Heat storage control means 2 for controlling the operation of
And the heating / heat storage control means 25 includes a predetermined temperature range in which the temperature of the heat storage material 4 detected by the heat storage material temperature detection means 22 is lower than the condensation temperature detected by the condensation temperature detection means 24 and close to the condensation temperature. Up to this point, both the refrigeration cycle (compressor 1) and the electric heating device 21 are operated, and when the temperature falls within a predetermined temperature range, only the operation of the electric heating device 21 is stopped, and when the temperature exceeds the upper limit temperature of the predetermined temperature range, the refrigeration cycle ( Since the operation of the compressor 1) is stopped and only the electric heat device 21 is operated, the heat storage material temperature Tw is reduced to the first predetermined temperature T2 by the heat storage heat exchanger 15 during the winter heat storage during the heat storage. The heat is condensed on the heat storage material 4 as a heat exchanger, and the electric heat
By heating and storing heat in the heat storage material 4, the temperature of the heat storage material 4 is set to be equal to or higher than the condensation temperature of the refrigeration cycle within a limited heating heat storage time, and the heating heat storage amount that can be stored per unit volume of the heat storage material 4 is obtained. By increasing, the amount of heat storage can be increased, and therefore the amount of heat storage that can be used during daytime heat storage heating increases, and the required heating capacity can be maintained by extending the heat storage maintenance time, and sufficient heating capacity can be maintained. Can be secured.

Further, the heat storage material temperature Tw is equal to or lower than the first predetermined temperature T2 for stopping the refrigeration cycle, and the condensing temperature T
c is higher than a value obtained by subtracting a predetermined temperature difference ΔT1, that is, the refrigeration cycle is operating near the condensing temperature, the condensing pressure on the refrigeration cycle is high, the compression ratio of the compressor 1 is high, and By temporarily stopping the operation of the electric heating device 21 when the power consumption of 1 is high, it is possible to reduce the maximum power consumption of the regenerative air conditioner during the heat storage. (Embodiment 4) FIG. 4 is a configuration diagram of a regenerative air conditioner according to Embodiment 4 of the present invention. FIG. 5 is a flowchart showing the operation of the embodiment. In the present embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 4, reference numeral 26 denotes a plurality of electric heating devices, 2
7 is a part of an electric heating device.

The regenerative air conditioner according to the fourth embodiment includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 9, and a second expansion valve mechanism 2.
0, the indoor heat exchangers 12 are sequentially connected in a ring shape, and one end of the heat storage heat exchanger 15 housed in the heat storage tank 3 together with the heat storage material 4 is connected to the indoor heat exchanger 12 via the first electromagnetic valve 17. The second solenoid valve 1 is connected to a pipe between the four-way valve 2 and the second solenoid valve 1.
9 is connected to the pipe between the outdoor heat exchanger 9 and the second expansion valve mechanism 20, and the other end of the heat storage heat exchanger 15 is connected to the second expansion valve via the first expansion valve mechanism 16. A plurality of electric heating devices 26 connected to a pipe between the valve mechanism 20 and the indoor heat exchanger 12 for heating the heat storage material 4 are provided in the heat storage tank 3, and further, a heat storage material for detecting the temperature of the heat storage material 4. Temperature detecting means 22 and compressor operating state detecting means 23 for detecting the operating state of compressor 1
Condensation temperature detection means 24 for detecting the condensation temperature of the refrigerant discharged from the compressor 1, and the temperature of the heat storage material 4 detected by the heat storage material temperature detection means 22 and the condensation temperature detection means 24 during the heating and heat storage during winter night. And a heating and heat storage control means 25 for controlling the operation of the refrigeration cycle (compressor 1) and the operation of the plurality of electric heating devices 26 based on the condensing temperature detected in step (1).

The heating heat storage control means 25 determines whether the temperature of the heat storage material 4 detected by the heat storage material temperature detecting means 22 is lower than a predetermined temperature which is lower than the condensing temperature detected by the condensing temperature detecting means 24 and close to the condensing temperature. Is the refrigeration cycle (compressor 1)
When the temperature exceeds a predetermined temperature, the operation of the refrigeration cycle (compressor 1) is stopped and all of the plurality of electric heating devices 26 are operated.

The operation of the regenerative air conditioner configured as described above will be described below with reference to the flowchart of FIG.

First, after the heating and heat storage operation is started, step 12 is executed.
Detects the heat storage material temperature Tw. In step 13, the condensation temperature Tc is detected. In step 14, if the heat storage material temperature Tw detected in step 01 is equal to or lower than the third predetermined water temperature T4, the process proceeds to step 17, and if not, the process proceeds to step 15.

In step 17, the refrigeration cycle is operated,
In step 18, the part 11 of the electric heating device is operated, and the process proceeds to step 19. In step 15, the refrigeration cycle is stopped,
In step 16, all the plurality of electric heating devices are operated, and the process proceeds to step 19.

In step 19, if the heat storage material temperature Tw detected in step 01 is equal to or lower than the fourth predetermined water temperature T5, the flow returns to step 12, and if not, the flow proceeds to step 20. In step 20, all of the plurality of electric heating devices are stopped, and the heating and heat storage operation is terminated.

In the heat storage type air conditioner of this embodiment, the heat storage material temperature Tw is set to the third predetermined temperature T4 during the heating and heat storage in the nighttime in winter.
The heat storage heat exchanger 15 is used as a condenser of a refrigerating cycle to radiate and condense heat on the heat storage material 4 and use it together with a part 2 of the electric heat device.
At 7, the heat storage material 4 is heated and stored, and when the heat storage material temperature Tw becomes equal to or higher than the third predetermined temperature T <b> 4, the plurality of electric heat devices 26 perform heating storage.

Thus, within a limited heating heat storage time,
By setting the temperature of the heat storage material 4 to be equal to or higher than the condensation temperature of the refrigeration cycle,
By increasing the heating heat storage amount that can store heat per unit volume of the heat storage material 4, the heating heat storage amount can be further increased.

At the time of heating using heat storage in the daytime, high-temperature refrigerant gas discharged from the compressor 1 passes through the four-way valve 2,
After the heat is condensed and heated in the indoor heat exchanger 12, the first heat
The expansion valve mechanism 16 decompresses and expands, and the heat storage heat exchanger 15 is used as an evaporator to evaporate and absorb heat from the heat storage material 4 to utilize the heat storage. The branch pipe 18 passes through the second solenoid valve 19 to the outdoor heat exchanger 9.
To the compressor 1 via the four-way valve 2.

At this time, the amount of heat storage that can be used for heat storage is further increased, and the required heating capacity can be maintained by extending the heat storage maintenance time, and sufficient heating capacity can be secured.

Further, when the heat storage material temperature Tw is equal to or lower than the third predetermined temperature T4 at which the refrigeration cycle is stopped, by operating only a part 27 of the electric heating apparatus, the consumption of the electric heating apparatus for heating and storing in combination with the refrigeration cycle is reduced. Electric power can be reduced, and the maximum power consumption of the regenerative air conditioner can be reduced.

As described above, in the regenerative air conditioner of this embodiment, the compressor 1, the four-way valve 2, the outdoor heat exchanger 9, the second expansion valve mechanism 20, and the indoor heat exchanger 12 are sequentially connected in a ring shape. The heat storage heat exchanger 15 housed in the heat storage tank 3 together with the heat storage material 4
Of the indoor heat exchanger 12 through the first solenoid valve 17.
And the outdoor heat exchanger 9 and the second expansion valve mechanism 2 via a second solenoid valve 19.
0, and the other end of the heat storage heat exchanger 15
A plurality of electric heating devices 26 connected to a pipe between the second expansion valve mechanism 20 and the indoor heat exchanger 12 via the first expansion valve mechanism 16 to heat the heat storage material 4 are provided in the heat storage tank 3. In the heat storage type air conditioner, the heat storage material temperature detection means 22 for detecting the temperature of the heat storage material 4, the compressor operation state detection means 23 for detecting the operation state of the compressor 1, and the discharge from the compressor 1 Temperature detecting means 2 for detecting the condensation temperature of the refrigerant
4 and a heat storage material temperature detecting means 2 for heating and storing heat during winter nights.
Refrigeration cycle (compressor 1) based on the temperature of heat storage material 4 detected in 2 and the condensation temperature detected in condensation temperature detecting means 24.
Heating heat storage control means 25 for controlling the operation of the heat storage device 4 and the operation of the electric heating device 26. The heating heat storage control means 25 detects the temperature of the heat storage material 4 detected by the heat storage material temperature detection means 22 by the condensation temperature detection means 24. When the temperature is equal to or lower than a predetermined temperature (T4) lower than the detected condensing temperature and close to the condensing temperature, the refrigeration cycle (compressor 1) and a part 27 of the plurality of electric heating devices are operated to exceed the predetermined temperature (T4). And refrigeration cycle (compressor 1)
Is stopped and all of the plurality of electric heating devices 26 are operated. Therefore, at the time of heating and storing heat during the winter night, the heat storage material exchanger Tw condenses the heat storage heat exchanger 15 until the third predetermined temperature T4. Heat is condensed on the heat storage material 4 as a heat exchanger, and is used together with the heat storage material 4 to heat and store the heat in the heat storage material 4 in a part 27 of the electric heating device,
When the heat storage material temperature Tw becomes equal to or higher than the third predetermined temperature T4, the plurality of electric heat devices 26 perform heating and heat storage, so that the temperature of the heat storage material 4 is set to be equal to or higher than the condensing temperature of the refrigeration cycle within a limited heating heat storage time. By increasing the amount of heating heat storage that can store heat per unit volume of the heat storage material 4, the amount of heating heat storage can be further increased. Therefore, during daytime heat storage heating heating, the amount of heating heat storage that can be used for heat storage is further increased. By increasing the time, the required heating capacity can be maintained, and sufficient heating capacity can be secured.

Further, when the temperature Tw of the heat storage material is equal to or lower than the third predetermined temperature T4 at which the refrigeration cycle is stopped, by operating only a part 27 of the electric heat device, the consumption of the electric heat device for heating and storing the heat in combination with the refrigeration cycle is reduced. Electric power can be reduced, and the maximum power consumption of the regenerative air conditioner can be reduced.

[0066]

As described above, according to the first aspect of the present invention, a compressor, a four-way valve, an outdoor heat exchanger, a second expansion valve mechanism, and an indoor heat exchanger are sequentially connected in a ring shape to form a heat storage tank. One end of the heat storage heat exchanger housed together with the heat storage material is connected to a pipe between the indoor heat exchanger and the four-way valve via a first electromagnetic valve, and is connected via a second electromagnetic valve. Connected to a pipe between the outdoor heat exchanger and the second expansion valve mechanism,
The other end of the heat storage heat exchanger is connected to a pipe between the second expansion valve mechanism and the indoor heat exchanger via a first expansion valve mechanism, and the heat storage material is used when heating and storing heat during winter night. An electric heat device for heating the heat storage material is provided in the heat storage tank, and the temperature of the heat storage material is set to be equal to or higher than the condensing temperature of the refrigeration cycle by the electric heat device provided in the heat storage tank at the time of heating heat storage in winter night. By increasing the amount of heating heat storage that can be stored per unit volume, the amount of heating heat storage can be increased, and therefore the amount of heating heat storage that can be used in daytime heat storage heating increases, and the required heating by increasing the heat storage maintenance time Capacity can be maintained and sufficient heating capacity can be secured.

The invention according to claim 2 of the present invention provides
The compressor, the four-way valve, the outdoor heat exchanger, the second expansion valve mechanism, and the indoor heat exchanger are sequentially connected in a ring shape, and one end of the heat storage heat exchanger housed together with the heat storage material in the heat storage tank is connected to the first heat storage heat exchanger. A pipe connected between the indoor heat exchanger and the four-way valve via a solenoid valve, and a pipe connected between the outdoor heat exchanger and the second expansion valve mechanism via a second solenoid valve And the other end of the heat storage heat exchanger is connected to a pipe between the second expansion valve mechanism and the indoor heat exchanger via a first expansion valve mechanism to heat the heat storage material. The heat storage device is disposed in the heat storage tank, and during heat storage during winter nights, the heat storage material is heated by the heat of the heat storage heat exchanger, and the heat storage material is condensed by the heat storage device by the heat storage device. It is configured to heat to a temperature higher than the temperature. By radiating and condensing heat on the heat storage material as a condenser for the freezing cycle and using it together with the heat storage device to heat and store heat in the heat storage material, the heating heat storage amount can be further increased within the limited heating heat storage time, and therefore during the daytime The amount of heating heat storage that can be used in the heat storage utilizing heating increases, and the required heating capacity can be maintained by extending the heat storage maintenance time, and sufficient heating capacity can be secured.

The invention according to claim 3 of the present invention provides
In the invention according to claim 2, the heat storage material temperature detecting means for detecting the temperature of the heat storage material, the condensing temperature detecting means for detecting the condensing temperature of the refrigerant discharged from the compressor, and the heat storage heat during winter night, Heating heat storage control means for controlling the operation of the refrigeration cycle and the operation of the electric heating device based on the temperature of the heat storage material detected by the heat storage material temperature detection means and the condensation temperature detected by the condensation temperature detection means, The heating heat storage control unit is configured to execute the refrigeration cycle until the temperature of the heat storage material detected by the heat storage material temperature detection unit falls within a predetermined temperature range lower than the condensation temperature detected by the condensation temperature detection unit and close to the condensation temperature. Operate both the and the electric heating device, stop only the electric heating device when entering the predetermined temperature range, stop the operation of the refrigeration cycle when exceeding the upper limit temperature of the predetermined temperature range. Serial is intended to operate only the electric heating device, in addition to the effect of the invention according to claim 2, further
For a certain period when the temperature of the heat storage material is close to the condensing temperature of the refrigeration cycle, the electric heating device is temporarily stopped, and after the refrigeration cycle reaches the condensing temperature and stopped, the heat storage material is heated again by the electric heating device to perform heating heat storage. In addition, it is possible to reduce the maximum power consumption of the regenerative air conditioner during the heat storage.

The invention according to claim 4 of the present invention provides
In the invention according to claim 2, a plurality of electric heat devices are provided in the heat storage tank, and a heat storage material temperature detecting means for detecting a temperature of the heat storage material, and a condensing temperature detection for detecting a condensing temperature of the refrigerant discharged from the compressor. Means, during heating heat storage in winter night, based on the temperature of the heat storage material detected by the heat storage material temperature detection means and the condensation temperature detected by the condensation temperature detection means, the operation of the refrigeration cycle and the plurality of the electric heating device Heating and heat storage control means for controlling the operation and the heating and heat storage control means, wherein the temperature of the heat storage material detected by the heat storage material temperature detection means is lower than the condensation temperature detected by the condensation temperature detection means. When the temperature is equal to or less than a predetermined temperature, the refrigeration cycle and a part of the plurality of electric heating devices are operated, and when the temperature exceeds the predetermined temperature, the operation of the refrigeration cycle is stopped and the plurality of the electric heating devices are operated. All It is a thing that operates, and when heating and storing heat in the winter night, the heat storage heat exchanger is radiated and condensed on the heat storage material as a condenser of the refrigeration cycle, and by using it together with multiple electric heating devices, the heat is stored in the heat storage material, Within the limited heating heat storage time, the heating heat storage amount can be further increased, so that the heating heat storage amount that can be used in daytime heat storage use heating increases, and the necessary heating capacity can be maintained by extending the heat storage maintenance time, Sufficient heating capacity can be secured.

Further, the heat storage material is heated by a part of the plurality of electric heat devices to perform heating and heat storage, and after the refrigerating cycle reaches the condensing temperature and stopped, the heat storage material is heated and heated and stored by all the electric heat devices. , The maximum power consumption of the regenerative air conditioner at the time of heating and storage can be reduced.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of Embodiments 1 and 2 of a regenerative air conditioner according to the present invention.

FIG. 2 is a configuration diagram of Embodiment 3 of a regenerative air conditioner according to the present invention.

FIG. 3 is a flowchart showing the operation of a heat storage type air conditioner according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of Embodiment 4 of a regenerative air conditioner according to the present invention.

FIG. 5 is a flowchart showing the operation of the regenerative air conditioner of the embodiment.

FIG. 6 is a refrigeration cycle diagram of a conventional regenerative air conditioner.

[Description of Signs] 1 Compressor 2 Four-way valve 3 Heat storage tank 4 Heat storage material 9 Outdoor heat exchanger 12 Indoor heat exchanger 15 Heat storage heat exchanger 16 First expansion valve mechanism 17 First electromagnetic valve 19 Second electromagnetic Valve 20 Second expansion valve mechanism 21 Electric heating device 22 Heat storage material temperature detecting means 24 Condensing temperature detecting means 25 Heating heat storage control means 26 Electric heating device 27 Part of electric heating device

Continued on the front page (72) Inventor Kiyoo Sugawara 2-9-1, Honcho, Yamagata City, Yamagata Prefecture Inside Tohoku Electric Power Co., Inc. (72) Inventor Koji Onuma 2-9-1, Honmachi, Yamagata City, Yamagata Prefecture Tohoku Electric Power (72) Inventor Makoto Suganuma 3-7-1, Ichibancho, Aoba-ku, Sendai City, Miyagi Prefecture Tohoku Electric Power Co., Inc. (72) Inventor Takeshi Ohira 4-5-2, Takaidahondori, Higashi Osaka City, Osaka Prefecture No. Matsushita Refrigerator Co., Ltd. (72) Tomiyuki Noma, Inventor 4-5-2 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Inside Matsushita Refrigerator Co., Ltd. 2-5 Matsushita Refrigeration Machinery Co., Ltd. (72) Masahiro Kishino 4-5-2-5 Matsushita Refrigeration Machinery Co., Ltd. (72) Inventor Hiroshi Kitayama Takaita Motodori, Higashi-Osaka City, Osaka 4-chome 2-5 Matsushita Refrigeration Co., Ltd. F term (reference) 3L092 TA02 TA08 TA11 UA13 VA02 WA02 XA28 YA03

Claims (4)

[Claims] An end of a heat storage heat exchanger in which a compressor, a four-way valve, an outdoor heat exchanger, a second expansion valve mechanism, and an indoor heat exchanger are sequentially connected in a ring shape, and are stored together with a heat storage material in a heat storage tank. Is connected to a pipe between the indoor heat exchanger and the four-way valve via a first solenoid valve, and the outdoor heat exchanger and the second expansion valve mechanism are connected via a second solenoid valve. The other end of the heat storage heat exchanger is connected to a pipe between the second expansion valve mechanism and the indoor heat exchanger via a first expansion valve mechanism, A heat storage type air conditioner in which an electric heat device for heating the heat storage material during heating heat storage in winter night is provided in the heat storage tank. 2. A heat storage heat exchanger, in which a compressor, a four-way valve, an outdoor heat exchanger, a second expansion valve mechanism, and an indoor heat exchanger are sequentially connected in a ring shape, and one end of a heat storage heat exchanger housed in a heat storage tank together with a heat storage material. Is connected to a pipe between the indoor heat exchanger and the four-way valve via a first solenoid valve, and the outdoor heat exchanger and the second expansion valve mechanism are connected via a second solenoid valve. The other end of the heat storage heat exchanger is connected to a pipe between the second expansion valve mechanism and the indoor heat exchanger via a first expansion valve mechanism, An electric heat device that heats the heat storage material is disposed in the heat storage tank, and when heating and storing heat during winter nights, the heat storage material is heated by radiating the heat storage heat exchanger, and the heat storage material is stored by the electric heat device. A regenerative air conditioner configured to heat above the condensation temperature of the heat exchanger. 3. A heat storage material temperature detecting means for detecting the temperature of the heat storage material, a condensing temperature detecting means for detecting a condensing temperature of the refrigerant discharged from the compressor, and the heat storing material temperature detecting means for heating and storing heat during winter night. Heating heat storage control means for controlling the operation of the refrigeration cycle and the operation of the electric heating device based on the temperature of the heat storage material detected by the means and the condensation temperature detected by the condensation temperature detection means, The refrigeration cycle and the electric heating device until the temperature of the heat storage material detected by the heat storage material temperature detection means falls within a predetermined temperature range lower than the condensation temperature detected by the condensation temperature detection means and close to the condensation temperature. Operate both, and when the temperature falls within the predetermined temperature range, only the operation of the electric heating device is stopped.When the temperature exceeds the upper limit temperature of the predetermined temperature range, the operation of the refrigeration cycle is stopped and only the electric heating device is operated. Thermal storage type air conditioner according to claim 2, characterized in that the rolling. 4. A plurality of electric heat devices are provided in a heat storage tank, wherein a heat storage material temperature detecting means for detecting a temperature of the heat storage material, a condensing temperature detecting means for detecting a condensing temperature of the refrigerant discharged from the compressor, During nighttime heat storage, the operation of the refrigeration cycle and the operation of the plurality of electric heating devices are controlled based on the temperature of the heat storage material detected by the heat storage material temperature detection means and the condensation temperature detected by the condensation temperature detection means. Heating heat storage control means, wherein the temperature of the heat storage material detected by the heat storage material temperature detection means is lower than the condensation temperature detected by the condensation temperature detection means and is close to the predetermined condensation temperature. When the temperature is equal to or less than the temperature, the refrigeration cycle and a part of the plurality of electric heating devices are operated, and when the temperature exceeds the predetermined temperature, the operation of the refrigeration cycle is stopped and all of the plurality of electric heating devices are operated. That The regenerative air conditioner according to claim 2, wherein: