JP3260418B2 - 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 a heat storage type air conditioner that stores heat using nighttime electric power, and more particularly to a high performance heat storage tank.

[0002]

2. Description of the Related Art Conventional regenerative air conditioners have already been developed in various ways.
There is a regenerative air conditioner as shown in Vol. 5, No. 752 (June 1990), P598.

[0003] The basic technology is described in FIG.
As shown in the figure, the outdoor unit 1 includes a compressor 2, a four-way valve 3,
The indoor unit 11 includes an indoor heat exchanger 12 and an indoor expansion valve 13. The heat storage unit 21 includes a heat storage tank 22, and switching valves V1 and V.
2, V3. Outdoor unit 1 and indoor unit 1
1 and the heat storage tank 22 are sequentially connected in a ring to form a refrigeration cycle.

[0004] The cooling operation in summer in this regenerative air conditioner will be described. First, night operation (ice making operation)
Then, the refrigerant flows in the direction of the dashed arrow in the figure to form an ice making cycle.

[0005] That is, the refrigerant condensed in the outdoor heat exchanger 4 is decompressed by the outdoor expansion valve 5, evaporates in the heat exchange section 24 in the heat storage tank 22, and remains around the heat exchange section 24. Ice is formed.

On the other hand, in the daytime operation (defrosting operation), the refrigerant flowing in the direction of the dashed arrow in the drawing and condensed in the defrost cycle outdoor heat exchanger 4 is transferred to the heat exchange section in the heat storage tank 22. 2
At 4, the heat is exchanged with the cold heat of the ice to be supercooled. Thereafter, the pressure is reduced by the indoor expansion valve 13 of the indoor unit 11, and the air is evaporated by the indoor heat exchanger 12 to perform cooling.

Therefore, in the daytime, in addition to the heat source capacity, the cooling capacity corresponding to the amount of supercooling can be added, so that the capacity of the outdoor unit can be reduced.

As described above, by converting surplus power energy during the 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. Is possible.

[0009]

However, in the above-mentioned conventional example, since the same heat exchanging section is used for the ice making operation and the ice melting operation in the heat storage tank, that is, outside ice making and inside ice melting are performed. However, when the generated ice is thawed, the heat extraction speed is low, and it has a drawback that it cannot cope with a large air conditioning load such as when starting operation.

Accordingly, an object of the present invention is to provide a regenerative air conditioner that improves the heat extraction speed during daytime operation.

[0011]

In order to achieve the above object, a regenerative air conditioner according to the present invention comprises a compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve , an inlet pipe of a heat storage tank, Said
Thermal storage tank, outlet piping section of the thermal storage tank, indoor expansion valve, indoor
Form a refrigeration cycle by sequentially communicating the side heat exchanger and the four-way valve
And the 1st heat exchange part of the said heat storage tank was arranged in the shape of a regular triangle.
A heat transfer tube, a first switching valve, and a second switching valve;
In parallel with the first heat exchange section, the second heat exchange section
1 In the center of the heat exchange section with the heat transfer tubes arranged in an equilateral triangle
A heat transfer tube, a third switching valve, and a fourth
A switching valve, and an inlet pipe of the heat storage tank;
Communicating with the outlet pipe section of the heat tank through a fifth switching valve,
And the inlet pipe section of the heat storage tank and the indoor heat exchanger
It communicates between the valve and the communicating part via the sixth switching valve to make ice.
During operation, the outdoor expansion valve is opened to a predetermined opening, and the indoor expansion valve is fully
Closed, 1st switching valve, 2nd switching valve, 5th switching valve, and 6th off
The switching valve is opened, the third switching valve and the fourth switching valve are closed, and the
During ice operation, the outdoor expansion valve is fully open, and the indoor expansion valve is at a predetermined opening.
, The first switching valve, the second switching valve, the third switching valve, and the fourth switching valve.
The switching valve is opened, and the fifth switching valve and the sixth switching valve are closed .

The first heat exchange part of the heat storage tank is constituted by heat transfer tubes arranged in a regular triangle, and the second heat exchange part is formed by the center of the heat transfer tubes arranged in the regular triangle of the first heat exchange part. It is composed of heat transfer tubes arranged to be located at

In this state, the first heat exchange section and the second heat exchange section can be connected to the refrigeration cycle by the first to sixth switching valves .

The heat transfer tube of the first heat exchange unit and the heat transfer tube of the second heat exchange unit in the heat storage tank are inserted through common fins.

[0015]

The operation of the present invention is as follows.

The cooling operation in summer in this regenerative air conditioner will be described. First, in night operation using nighttime power, the heat storage tank is controlled by controlling the first to sixth switching valves and the outdoor expansion valve. Ice making using the first heat exchange section inside
Driving .

In particular, in the case of nighttime ice making operation in summer, the first
Open the switching valve, the second switching valve, the fifth switching valve, and the sixth switching valve
Then, the third switching valve and the fourth switching valve are closed, and the first heat exchange section in the heat storage tank acts as an evaporator to generate ice around the heat transfer tube of the first heat exchange section, and cool as ice water. I do. That is, the refrigerant condensed in the outdoor heat exchanger is decompressed by the outdoor expansion valve and evaporated in the first heat exchange section in the heat storage tank.
Ice is generated around the first heat exchange section.

[0018] On the other hand, during the day in operation (thawing operation), the first switching
By controlling the switching valve to the sixth switching valve, the outdoor expansion valve, and the indoor expansion valve, the first switching valve, the second switching valve, the third switching valve,
And the fourth switching valve are opened, and the fifth and sixth switching valves are closed.
The refrigerant condensed in the outdoor heat exchanger flows into both the first heat exchange unit and the second heat exchange unit in the heat storage tank.

That is, ice is formed on the heat transfer tube of the second heat exchange portion, which is not iced, which is present at the center of the heat transfer tubes arranged in a triangular shape covered with ice, and on the outer periphery of the heat transfer tube. Since the refrigerant flows through both the heat transfer pipes of the first heat exchange section, the heat transfer area increases, the heat exchange with the cold water of ice water is performed at high speed, and the supercooled, and then the refrigerant is supplied to the indoor expansion valve of the indoor unit. Then, the air is cooled down by evaporating in the indoor heat exchanger.

Therefore, in the daytime, in addition to the heat source capacity, the cooling capacity corresponding to the supercooling can be added, so that not only the capacity of the outdoor unit can be reduced, but also it is possible to cope with a large air conditioning load.

Further, by providing a common fin for the heat transfer tube of the first heat exchange unit and the heat transfer tube of the second heat exchange unit, the heat transfer area is further increased, and the ice making density and the ice making density during the ice making operation at night are increased. It is possible to further increase the heat storage speed during the heat storage operation, and the defrosting speed and the heat radiation speed in the daytime.

[0022]

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 a regenerative air conditioner according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of a heat storage tank in FIG.
FIG. 3 is a sectional view showing a state during the ice making operation of FIG. 2, and FIG. 4 is a sectional view of a heat storage tank in another embodiment.

In the regenerative air conditioner of this embodiment,
The refrigeration cycle is formed by sequentially connecting the outdoor unit 1, the indoor unit 11, and the heat storage unit 21 in a ring shape.

The heat storage unit 21 includes a heat storage tank 22 and a first switch.
Valve KV1, second switching valve KV2, third switching valve KV3, fourth
It comprises a switching valve KV4, a fifth switching valve KV5, and a sixth switching valve KV6 .

Further, heat storage tank 22 and the first heat exchange unit HE1 consists second heat exchanger HE2 Prefecture, each of the first switching valve for the first heat exchange unit HE1 KV1, a second switching valve KV2 second
Third switching valve KV3 , fourth switching valve KV4 for heat exchange section HE
Through the sixth switching valve KV6,
An inlet pipe portion of the heat storage tank 22, and the indoor-side heat exchanger 12 four-way
The connection with the communication part with the valve 3 is connected. In addition, the fifth
The switching valve KV5 is for switching the circuit between the ice making operation and the ice melting operation.

The operation of the above embodiment will be described. First, the cooling operation in the summer will be described. In the night operation (ice making operation), the outdoor expansion valve 5 is opened at a predetermined opening,
Expansion valve 13: fully closed, first switching valve KV1: open, second switching valve KV2: open, third switching valve KV3: closed, fourth switching valve KV
4: Closed, fifth switching valve KV5: open, sixth switching valve KV6: open, refrigerant flows in the direction of the dashed arrow in the figure, and an ice making cycle is formed.

That is, the refrigerant condensed in the outdoor heat exchanger 4 is decompressed by the outdoor expansion valve 5, and the first refrigerant in the heat storage tank 22.
Evaporation occurs in the heat exchange section HE1, and ice is generated around the heat transfer tube P1 of the first heat exchange section HE1.

On the other hand, during daytime operation (thaw operation), outdoor expansion
Expansion valve: Fully open, indoor expansion valve: Open to a predetermined opening, first switching valve KV
1: Open, second switching valve KV2: Open, third switching valve KV3:
Open, fourth switching valve KV4: Open, fifth switching valve KV5: closed, the
6-switching valve KV6: Closed, the refrigerant flows in the direction of the solid line arrow in the figure, and an thawing cycle is formed.

That is, in this case, the refrigerant condensed in the outdoor heat exchanger 4 is located at the center of the triangularly arranged heat transfer tubes P1 covered with ice as shown in FIG. 2
The refrigerant flows through both the heat transfer tube P2 of the heat exchange unit HE2 and the heat transfer tube P1 of the first heat exchange unit HE1 in which ice is generated on the outer periphery.

Thus, the ice water and the cold water can be
The heat transfer area between the mediums increases, and the medium exchanges heat with the cold water of ice water at a high speed to be supercooled, and cools and cools the ice water in the first heat exchange section HE1 and the second heat exchange section HE2 in the heat storage tank 22. Replace and supercool.

The first heat exchange section HE in the heat storage tank 22
The first and second heat exchangers HE2 exchange heat with ice cold water and are supercooled. Thereafter, the pressure is reduced by the indoor expansion valve 13 of the indoor unit 11 and evaporated by the indoor heat exchanger 12. Cooling is performed.

Therefore, during the de-icing operation , in addition to the heat source capacity, the cooling capacity corresponding to the supercooling by the heat storage amount of the heat storage tank can be added, so that not only the capacity of the outdoor unit can be reduced, but also the air conditioning load can be reduced. When increased from initial design
But it can be handled.

Also, as in the other embodiment shown in FIG.
By installing the common fin F in the heat transfer tube P1 of the heat exchange unit HE1 and the heat transfer tube P2 of the second heat exchange unit HE2, the heat transfer area further increases, and the ice making density and the heat storage operation during the ice making operation at night. It is possible to further increase the heat storage speed at the time, the ice melting speed and the heat radiation speed in the daytime .

As described above, in this embodiment, the compressor 2,
Four-way valve 3, outdoor heat exchanger 4, an outdoor unit 1 consisting of the outdoor side expansion valve 5 which, indoor heat exchanger 12, the indoor unit 11 consisting of the indoor expansion valve 13, the heat storage tank 22, the first
Switching valve to sixth switching valve KV1, KV2, KV3, KV4
In the heat storage unit 21 composed of KV5 and KV6 , the pressure
Contractor, four-way valve, outdoor heat exchanger, outdoor expansion valve, heat storage tank
An inlet pipe section, the heat storage tank, an outlet pipe section of the heat storage tank,
The indoor expansion valve, the indoor heat exchanger, and the four-way valve are sequentially connected to form a refrigeration cycle.

Then, the first heat exchange section HE1 of the heat storage tank 22
Transfer tube P1 in which are arranged in a regular triangular shape , the first switching valve KV
1, and it consists of the second switching valve KV2 Prefecture, and first heat exchange
A heat transfer tube P2 in which the second heat exchange portion HE2 is arranged at the center of the heat transfer tubes P1 arranged in a regular triangular shape, a third switching valve KV3, and a fourth switch in parallel with the exchange portion HE1.
And a valve KV3 .

Further, an inlet pipe portion of the heat storage tank 22 and a heat storage tank
22 and the outlet pipe section 22 via a fifth switching valve KV5.
Through the inlet pipe of the heat storage tank 22 and the indoor heat exchanger
A sixth switching valve KV6 is provided between the connection portion 12 and the communication portion of the four-way valve 3.
The outdoor expansion valve 5 is opened at a predetermined opening during the ice making operation.
, The indoor expansion valve 13 is fully closed, the first switching valve KV1, the second
Switching valve KV2, fifth switching valve KV5, and sixth switching valve KV
6, the third switching valve KV3 and the fourth switching valve KV4
Closed, open outdoor expansion valve 5 fully during thaw operation, indoor expansion
The valve 13 is opened to a predetermined opening, the first switching valve KV1, the second switching valve
KV2, the third switching valve KV3, and the fourth switching valve KV4 are opened.
Then, the fifth switching valve KV5 and the sixth switching valve KV6 are closed.
You.

Thus , the heat source volume during the de-icing operation
In addition to the amount, the amount of heat stored in the heat storage tank 22
Since the cooling capacity can be increased , not only can the capacity of the outdoor unit 1 be reduced, but also the air conditioning load increases from the initial design.
Even if it is added, it can be handled.

The first heat exchange section HE1 in the heat storage tank 22
The heat transfer area is further increased by inserting the heat transfer tube P1 of the second heat exchange tube HE2 and the heat transfer tube P2 of the second heat exchange section HE2 into a common fin F, thereby increasing the ice making density during the ice making operation at night and the heat storage speed during the heat storage operation. In addition, it is possible to further increase the thawing speed and the heat radiation speed in the daytime, and to provide a regenerative air conditioner with high load following ability.

[0040]

As described above, the present invention provides a compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve , and an inlet pipe of a heat storage tank.
Section, heat storage tank, outlet pipe section of the heat storage tank, indoor expansion valve, indoor
Form a refrigeration cycle by sequentially communicating the side heat exchanger and the four-way valve
Heat transfer in which the first heat exchange part of the heat storage tank is arranged in an equilateral triangle
A pipe, a first switching valve, and a second switching valve, and
The first heat exchange section of the second heat exchange section in parallel with one heat exchange section
Located in the center with the heat transfer tubes arranged in an equilateral triangle
Transfer tube, third switching valve, and fourth switching valve
And the outlet piping of the heat storage tank
And a pipe section through a fifth switching valve, and a heat storage tank.
Between the inlet pipe section and the communication section between the indoor heat exchanger and the four-way valve.
Through a sixth switching valve to allow outdoor expansion during ice making operation.
The expansion valve is opened to a predetermined opening, the indoor expansion valve is fully closed, the first switching valve,
The second switching valve, the fifth switching valve, and the sixth switching valve are opened, and the third switching valve is opened.
The switching valve and the fourth switching valve are closed, and the outdoor
The expansion valve is fully opened, the indoor expansion valve is opened to a predetermined opening, and the first switching is performed.
Opening the valve, the second switching valve, the third switching valve, and the fourth switching valve,
The fifth switching valve and the sixth switching valve are closed .

Thus , the heat source capacity during the de-icing operation
Cooling equivalent to supercooling due to the amount of heat stored in the heat storage tank in addition to the amount
As the capacity can be increased , not only the capacity of the outdoor unit can be reduced, but also the air conditioning load has increased from the initial design.
It is possible to respond even in the case .

By inserting the heat transfer tube of the first heat exchange unit and the heat transfer tube of the second heat exchange unit in the heat storage tank through a common fin, the heat transfer area is further increased, so that during the ice making operation at night, It is possible to further increase the ice making density, the heat storage speed at the time of the heat storage operation, the ice melting speed and the heat release speed in the daytime, and it is possible to provide a heat storage type air conditioner with high load following ability.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the heat storage tank in FIG.

FIG. 3 is a sectional view showing a state during the ice making operation of FIG. 2;

FIG. 4 is a sectional view of a heat storage tank according to another embodiment of the present invention.

FIG. 5 is a refrigeration cycle diagram of a heat pump type air conditioner showing a conventional example.

[Explanation of symbols]

2 Compressor 3 Four-way valve 4 Outdoor heat exchanger 5 Outdoor expansion valve 12 Indoor heat exchanger 13 Indoor expansion valve 22 Heat storage tank HE1 First heat exchange section of heat storage tank 22 HE2 Second heat exchange of heat storage tank 22 Section KV1 First switching valve KV2 Second switching valve KV3 Third switching valve KV4 Fourth switching valve KV5 Fifth switching valve KV6 Sixth switching valve

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kozo Suzuki 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company (72) Inventor Yoshihide Sugita 1-3-1 Uchisaiwaicho, Chiyoda-ku, Tokyo TEPCO (56) References JP-A-3-28673 (JP, A) JP-A-1-78835 (JP, U) JP-A-58-114471 (JP, U) JP-A-60-23670 (JP, A) U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 F25B 13/00 F25C 1/00

Claims (2)

(57) [Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve , an inlet pipe of a heat storage tank, the heat storage tank, and the heat storage
Outlet piping of tank, indoor expansion valve, indoor heat exchanger, four-way
The valves are sequentially communicated to form a refrigeration cycle, and the heat storage tank
Heat transfer tube with first heat exchange part arranged in equilateral triangle, first switch
A first valve and a second switching valve.
In parallel with the first heat exchange section, the second heat exchange section
Arrange so that it is located at the center of the heat transfer tubes arranged in a square shape.
Composed of heat transfer tubes, third switching valve, and fourth switching valve
And an inlet pipe of the heat storage tank and an outlet pipe of the heat storage tank.
And a heat storage tank through a fifth switching valve.
And the communication section between the indoor heat exchanger and the four-way valve
Through a sixth switching valve, and when the ice making operation is performed, the outdoor
Open expansion valve to a specified opening, fully close indoor expansion valve, first switch
Opening the valve, the second switching valve, the fifth switching valve, and the sixth switching valve,
Close the third switching valve and the fourth switching valve, and during the thaw operation
The outdoor expansion valve is fully opened, the indoor expansion valve is opened to a predetermined opening, and the first off
Open the switching valve, the second switching valve, the third switching valve, and the fourth switching valve
In addition, a regenerative air conditioner that closes a fifth switching valve and a sixth switching valve . 2. A heat transfer tube in a first heat exchange section in a heat storage tank and a second heat transfer tube.
The heat storage type air conditioner according to claim 1, further comprising a heat storage tank in which a heat transfer tube of the heat exchange unit is inserted through a common fin.