JP3241203B2 - Ice 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 ice storage type air conditioner.

[0002]

2. Description of the Related Art A system diagram of a conventional ice regenerative air conditioner is shown in FIG. The ice heat storage type air conditioner includes an ice heat storage unit 1, an outdoor unit 2, and an indoor unit 3.

[0003] This machine makes ice in the ice heat storage unit 1 at night,
During daytime power peaks, the compressor 26 in the outdoor unit 2 is not operated, and the ice is thawed to perform cooling by using it as a cold heat source, thereby enabling a significant peak cut in power consumption. is there.

[0004] The ice heat storage unit 1 includes an ice heat storage tank 4, a water pump 5, a refrigerant pump 6, a liquid reservoir 7, a throttle 8, and on-off valves 14,1.
5, 16, 17, 18, 19, 20, check valves 21,
2, 23, 24, 25, and the like. A partition plate 9 is provided in the ice heat storage tank 4. An ice making chamber 10 is formed above the partition plate 9, and an ice melting chamber 11 is formed below the partition plate 9. An ice making heat transfer tube 12 is installed in the ice making room 10, and an ice melting heat transfer tube 13 is installed in the ice melting room 11. In addition, the heat transfer tube 1 for ice making
2 and the thawing heat transfer tube 13 are connected in series.

The outdoor unit 2 includes a compressor 26, a four-way switching valve 27, an outdoor heat exchanger 28, a throttle 29 and the like.

The indoor unit 3 includes an indoor heat exchanger 30, a throttle 31, and the like.

The ice heat storage unit 1 is connected to the outdoor unit 2 via a connecting liquid pipe 32 and a connecting gas pipe 37, and is connected to the indoor unit 3 via a connecting liquid pipe 34 and a connecting gas pipe 35.

This ice regenerative air conditioner can be operated in four operation modes: a cooling operation, a heating operation, an ice making operation, and an ice melting / cooling operation. The operation of each operation mode will be described below with reference to FIG.

In the cooling operation, the gas refrigerant discharged from the compressor 26 enters the outdoor heat exchanger 28 via the four-way switching valve 27 as shown by the solid line arrow, and radiates heat to condense and liquefy. This liquid refrigerant passes through the connection liquid pipe 32,
It enters the ice heat storage unit 1 and enters the indoor unit 3 via the liquid pipe 33, the open / close valve 19, the check valve 24 and the connecting liquid pipe 34 interposed therebetween. Then, after being adiabatically expanded by being squeezed by the iris 31, it enters the indoor heat exchanger 30, where it cools the indoor air and evaporates. This gas refrigerant enters the ice heat storage unit 1 via the connecting gas pipe 35, flows through the gas pipe 36, and
7 and returns to the outdoor unit 2, and is sucked into the compressor 26 via the four-way switching valve 27.

In the heating operation, the four-way switching valve 27 is switched in the opposite manner to the above, and the refrigerant discharged from the compressor 26 receives the four-way switching valve 27, the connecting gas pipe 37,
Gas pipe 36, connection gas pipe 35 in ice heat storage unit 1, indoor heat exchanger 30, throttle 31, connection liquid pipe 34 in indoor unit 3, liquid pipe 33 in ice heat storage unit 1, open / close valve 20, check valve 25, connecting liquid pipe 32, throttle 29 of outdoor unit 2,
The flow returns to the compressor 26 through the outdoor heat exchanger 28 and the four-way switching valve 27 in this order.

In the cooling operation and the heating operation, the on-off valves 14, 15, 16, 17, 1 in the ice heat storage unit 1 are provided.
8 is closed, and the water pump 5 and the refrigerant pump 6 are stopped. In the cooling operation, the on-off valve 19 is open and 20 is closed. In the heating operation, the on-off valve 19 is closed.
0 is open. In the ice making operation, the on-off valve 16 is opened, the on-off valves 14, 15, 17, 18, 19, and 20 are closed, and the water pump 5 and the refrigerant pump 6 are stopped.

In the ice making operation, the refrigerant discharged from the compressor 26 passes through the four-way switching valve 27, the outdoor heat exchanger 28, and the connecting liquid pipe 32 as shown by the white arrow, and the ice heat storage unit 1
to go into. Then, the liquid enters the throttle 8 via the on-off valve 16 interposed in the bypass liquid pipe 38, and is adiabatically expanded by being throttled here, and then enters the ice making heat transfer pipe 12 from the ice making heat transfer pipe liquid connection port 12 b. The water 100 outside the tube is cooled in the course of flowing through the inside of the tube, and the water 100 is evaporated and vaporized by forming icing 101 around the heat transfer tube 12 for making ice. This gas refrigerant returns to the outdoor unit 2 through the heat transfer pipe gas connection port 12a for ice making, the bypass gas pipe 39, the check valve 21, the gas pipe 36, and the connection gas pipe 37, and the four-way switching valve 27
, And is sucked into the compressor 26.

In the thawing cooling operation, the compressor 26 is stopped, and the water pump 5 and the refrigerant pump 6 are driven. And
The on-off valves 14, 15, 17, 18 are opened, and the on-off valves 1
6, 19 and 20 are closed.

Thus, the liquid refrigerant discharged from the refrigerant pump 6 is supplied to the refrigerant pump discharge pipe 4 as shown by the black arrow.
1, open / close valve 18, check valve 23, liquid pipe 33, connecting liquid pipe 34
And enters the indoor unit 3. And the aperture 3
After the adiabatic expansion in step 1, the air enters the indoor heat exchanger 30, where the indoor air is cooled to evaporate. This gas refrigerant enters the ice heat storage unit 1 via the connecting gas pipe 35. Then, the gas flows into the ice making heat transfer tube 12 from the heat transfer tube gas connection port 12a via the on-off valve 14 interposed in the gas pipe 36 and the bypass gas pipe 39. The ice making heat transfer tube 12 and the ice melting heat transfer tube 13 are connected in series by an ice making heat transfer tube liquid connection port 12b and an ice melting heat transfer tube inlet 13a, and flow into the ice melting heat transfer tube 13. The gas refrigerant that has flowed into the ice making heat transfer tube 12 melts the ice 101 adhering to the outside of the tube and is condensed to form a two-phase refrigerant. Next, the refrigerant in the two-phase state flows into the heat transfer pipe 13 for deicing and exchanges heat with water outside the pipe to completely condense and liquefy. Then, this liquid refrigerant is sucked into the refrigerant pump 6 via the deicing heat transfer tube outlet 13b and the refrigerant pump suction pipe 40, where it is pressurized and discharged again from the refrigerant pump discharge pipe 41. During this time, the water in the ice melting chamber 11 is sucked into the water pump suction pipe 44 and is urged by the water pump 5 so that the water pump discharge pipe 4
5, sprays onto the ice making chamber 10, flows around the ice making heat transfer tube 12, and adheres to the ice making heat transfer tube 12.
1 is melted from the outside. Then, it enters the ice melting chamber 11 through the tip clearance of the partition plate 9, flows around the ice melting heat transfer tube 13, exchanges heat with the refrigerant in the tube, and raises the temperature.

The stationary refrigerant circulation during the deicing and cooling operation is as described above. At the start, the liquid refrigerant stored in the liquid reservoir 7 is supplied to the liquid pipe 33 and the bypass liquid pipe 3.
8, the heat is transferred to the ice making heat transfer tube 12 and the ice melting heat transfer tube 13 through the on-off valve 15 and the bypass gas pipe 39.

Reference numeral 50 denotes a controller for controlling the operation of the air conditioner. FIG. 2 is a control block diagram of a main part of the controller 50.

The detected value of the temperature sensor 55 for detecting the temperature of the indoor air sucked into the indoor heat exchanger 30 (not shown in FIG. 2), the set value of the indoor temperature setter 56, the operation switch 57, the peak cut operation The switching signal of the switch 58 etc. is A
The signal is converted into a digital signal by a / D converter 51, and enters a central processing unit (CPU) 53 via an interface 52, where predetermined arithmetic processing and control processing are performed, and an operation mode is determined. Then, through the interface 54, the compressor 26, the four-way switching valve 27, the water pump 5, the refrigerant pump 6, the on-off valves 14, 15, 16, 17, 18, 19,
20 to start and stop the compressor, the water pump, and the refrigerant pump, and open and close the on-off valves 14 to 20 according to the operation mode. The central processing unit (CPU) 53 stores a time period during which the ice making operation is performed (for example, 22:00 to 8:00) and a time period during which the ice melting and cooling operation is performed (for example, from 13:00 to 16:00).

When the peak cut operation is performed in summer, the ice making operation is performed at night (22:00 to 8:00) by turning on the operation switch 57 and the peak cut operation switch 58. The peak cut operation is performed in which the operation is switched to the ice melting cooling operation at the time, and returns to the normal cooling operation at 16:00.

[0019]

The above conventional ice storage type air conditioner has the following problems to be solved.

That is, in the conventional ice regenerative air conditioner, the ice melting and cooling operation is started at a predetermined time (for example, 13:00) and is ended at a predetermined time (for example, 16:00).

The indoor cooling load increases in midsummer when the outside air temperature is the highest, but when the outside air temperature decreases, the indoor temperature decreases and the indoor cooling load decreases.

When the ice melting / cooling operation is started in a state where the indoor temperature is low, the evaporation of the refrigerant in the indoor heat exchanger 30 becomes inactive, so that the ice does not completely turn into a gas refrigerant (two-phase state). Return to the heat storage tank 4. Therefore, heat exchange between the refrigerant and ice in the ice making heat transfer tube 12 is reduced, and the melting ability of ice is reduced.
As a result, at a predetermined time (for example, 16:00) when the ice melting / cooling operation is stopped, there is a problem that the ice remains unmelted and the entire ice cannot be effectively used up.

An object of the present invention is to provide an ice regenerative air conditioner in which the ice melting and cooling operation is stopped only after all of the ice storage is melted.

[0024]

SUMMARY OF THE INVENTION The present invention aims at providing an ice storage type air conditioner described below as means for solving the above-mentioned problems.

The compressors, the outdoor unit comprising an outdoor heat exchanger, etc., indoor heat exchanger, an indoor an aperture such units
When ice thermal storage tank which is disposed an ice making heat transfer pipe or the like, the liquid refrigerant and a ice storage unit with a coolant pump for pumping at ice-cooling operation, the ice storage unit, the outdoor uni
Liquid refrigerant piping connecting the unit and the indoor unit and gas cooling
During the ice-making operation, the above-mentioned outdoor unit
Heat transfer tube for ice making in the ice storage tank
To make ice in the ice storage tank.
The gas refrigerant evaporated and vaporized in the indoor unit is stored on ice as described above.
The refrigerant is circulated through a heat transfer tube for ice making in the tank and condensed and liquefied.
Connected refrigerant to circulate through the pump to the indoor unit.
While connecting with a pipe, the compressor is operated and the outdoor unit is connected.
Cooling performed by circulating a refrigerant between the knit and the indoor unit
Chamber operation, operating the compressor, and the outdoor unit and the room
A heating operation performed by circulating a refrigerant between the internal units,
The compressor is operated, and the outdoor unit and the ice storage unit are operated.
Ice making operation by circulating the refrigerant between the heat transfer tubes for ice making
And stopping the compressor and turning on the refrigerant pump
Operate and cool between the indoor unit and the ice storage unit.
One of the operation modes of the ice melting cooling operation performed by circulating the medium
Ice storage type air conditioner with selectable
It has the following configuration .

That is, the water temperature in the ice heat storage tank is detected.
Water temperature sensor and the detected water temperature value
100% ice when water temperature rises (eg 4 ° C)
Judging that it is thawed, and decides to end the thaw cooling operation
Comparing means and a predetermined time period (for example, 13:00 to 16:00)
Comprising a controller which occupies performed thawed cooling operation,
In the controller the predetermined time period (13 to 16 o'clock) ice-cooling operation end time (hour was example, if 16) by,
Until when the comparing means does not determine the ice-cooling operation is completed, the ice-cooling operation by extending from the predetermined time period (at 13-16), it is determined that the ice had melted 100%
To become a possible function is ice storage air conditioner according to claim.

[0027]

The present invention is configured as described above and has the following effects.

A water temperature sensor for detecting the temperature of the water in the ice heat storage tank, and the detected value of the water temperature sensor is a predetermined water temperature (for example, 4 ° C.).
When it has risen to 100%, it is determined that the ice has melted to 100%, and comparison means is provided for determining the end of the ice melting cooling operation.
The thaw cooling operation is not terminated while unmelted ice remains, and the cold energy of the ice is fully utilized.

Further, a controller for causing the thawed cooling operation in a predetermined time period, and the controller is still ice-cooling operation even comparing means ice-cooling operation end time by a predetermined time period arrives If you have not decided to exit,
To provide the ability to continue the ice-cooling operation by extending the predetermined time period, can be set thawed cooling operation in a time zone of optimal along the power circumstances or social demands.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted unless necessary.

FIG. 1 is a control block diagram of the present embodiment.
In the figure, reference numeral 50a denotes a controller for controlling the operation of the ice storage type air conditioner of this embodiment, and reference numeral 59 denotes a controller provided at an appropriate position in the ice storage chamber 10 of the ice storage tank 4 for detecting a water temperature in the ice storage chamber 10. The water temperature sensor 60 is a comparison means for determining that the ice has been melted by 100% based on the detection value of the water temperature sensor 59. Other configurations are the same as those in FIG.

Next, the operation of the above configuration will be described.

In the thaw cooling operation, the comparing means 60
A predetermined water temperature (for example, 4 ° C.) indicating that the ice has completely melted is stored, and the comparing means 60 calculates the predetermined water temperature (T) and the detection value (t) of the received water temperature sensor 59. In comparison, when t <T, an ice-cooling / cooling operation continuation command is issued. When t increases, and when t = T, an ice-cooling / cooling operation stop command is sent to the central processing unit via the A / D converter 51 and the interface 52. Output to the device (CPU) 53.

When the CPU 53 satisfies both the predetermined time (for example, 16:00) for ending the conventional ice-cooling / cooling operation and the ice-cooling / cooling operation stop command from the comparison means 60, the CPU 53 executes the ice-cooling / cooling operation. Decide the operation stop.

Therefore, even if the ice melting / cooling operation is started in a state where the room temperature is low, the ice melting / cooling operation is extended until the ice in the ice storage tank 4 is completely melted. And power consumption can be further reduced.

In this embodiment, in order to make it easier to understand the contents of the present invention, it is assumed that the comparison means 60 is additionally provided in the controller 50a without changing the conventional central processing unit (CPU) 53. However, the central processing unit (CP
U) The above functions may be incorporated in the central processing unit (CPU) 53 by modifying or changing the calculation and processing software in the CPU 53. Other configurations and operations are the same as those of the conventional one shown in FIGS. 2 and 3, and corresponding members are denoted by the same reference numerals.

For reference, the melting amount of ice and the heat storage tank 4 (ice making room 1)
FIG. 4 shows the relationship with the water temperature in (0). As the melting of ice progresses, the water temperature gradually rises, and when 100% has melted, the water temperature rises sharply. Accordingly, it is possible to detect that 100% of the ice has melted, based on the temperature (4 ° C. in the figure) at which the water temperature rapidly increases.

The above description is based on the central processing unit (CPU) 53.
Means that the ice melting / cooling operation is stopped when both the predetermined time (16:00) and the ice melting / cooling operation stop command from the comparing means 60 are satisfied. However, the ice melting / cooling operation may be stopped by receiving either of them. it can.

As described above, according to the present embodiment, during the ice melting / cooling operation, the comparison means 60 receives the complete melting of the ice in the ice heat storage tank 4 by the water temperature sensor 59, and then the ice cooling operation is started for the first time. Is stopped, for example, at the time of non-peak time of electric power, for example, the cold energy stored at night or the like can be fully utilized, and there is an advantage that electric power can be significantly saved.

In addition, a time zone for the ice-cooling / cooling operation is set in advance in consideration of the electric power situation and the like, and even if the end time comes, if the above-mentioned condition of total ice melting is not satisfied, the ice-cooling / cooling operation is performed. Since the controller 50a operates so as to continue the operation, there is an advantage that the ice melting / cooling operation optimal for the power situation and the living condition of the person can be set.

[0041]

As described above, the ice regenerative air conditioner of the present invention
Unit with an air conditioner, outdoor heat exchanger, etc.
Indoor unit with heat exchanger, throttle, etc., and heat transfer tube for ice making
The ice regenerative tank equipped with the chiller pumps the liquid refrigerant during the ice melting and cooling operation
And an ice heat storage unit having a refrigerant pump and the like.
The ice storage unit is an outdoor unit and an indoor unit.
Between the liquid refrigerant side pipe and the gas refrigerant side pipe
During the ice making operation, the condensed and liquefied
The liquid refrigerant is circulated through the ice-making heat transfer tubes in the ice storage tank to store ice heat.
Ice is made in the tank, and during the thaw cooling operation, the indoor unit steams
A heat transfer tube for ice making in the ice heat storage tank with the vaporized gas refrigerant.
To liquefy and condense it through the refrigerant pump.
When connected by connecting refrigerant piping to circulate the knit,
Then, the compressor is operated, and the outdoor unit and the indoor unit are operated.
Cooling operation performed by circulating a refrigerant between
Operate the compressor and move between the outdoor unit and the indoor unit.
Heating operation by circulating refrigerant in the compressor and operating the compressor
And a heat transfer tube for ice making of the outdoor unit and the ice heat storage unit.
An ice making operation performed by circulating a refrigerant between the compressor and the compressor
While stopping the operation of the refrigerant pump,
Circulating refrigerant between the unit and the ice storage unit
Ice that can be selected from any of the thaw cooling operation modes
A heat storage type air conditioner, which detects a water temperature in the ice heat storage tank.
The detected water temperature sensor and the detected water temperature
When the water temperature rises to the specified temperature, it is determined that the ice has melted to 100%.
Comparing means for determining the termination of the thaw cooling operation,
A controller that performs thaw cooling operation at a predetermined time
And the controller operates according to the predetermined time period.
At the end time of the thaw cooling operation, the comparing means
If you have not decided to terminate the cell operation,
It was determined that the ice melted 100% after the specified time period.
Since it is configured to have a function that can be continued until it is turned off, the following effects are obtained.

That is , in the thaw cooling operation, 100
At the time of melting, the ice-cooling operation is terminated, and the operation can be shifted to the normal cooling operation.

Therefore, all the ice produced at night can be effectively used, and the power consumption can be further reduced.

[0044] Also, for example, a predetermined time period which is determined by the peak time adjustment discount agreement with the power company (for example, 13
From 16:00 to 16:00), the thaw cooling operation is performed, and at the end time (for example, 16:00), if the ice has not yet completely melted by 100%, the thaw cooling operation is continued, and the ice is cooled to 100%.
At the time of melting, the thaw cooling operation is completed, and the operation can be shifted to the normal cooling operation.

Therefore, if the room temperature is low and the ice melting / cooling operation occurs within a predetermined time (for example, 13:00 to 16:00), the ice melting / cooling operation is extended until 100% melting progresses. Therefore, the entire amount of ice can be effectively used, and the power consumption can be further reduced.

[Brief description of the drawings]

FIG. 1 is a control block diagram according to one embodiment of the present invention;

FIG. 2 is a main part control block diagram of a conventional ice storage type air conditioner;

FIG. 3 is a system diagram of a conventional ice storage air conditioner,

FIG. 4 is a diagram showing a relationship between a water temperature in an ice heat storage tank and an amount of ice melted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ice heat storage unit 2 Outdoor unit 3 Indoor unit 4 Ice heat storage tank 5 Water pump 6 Refrigerant pump 12 Ice making heat transfer tube 26 Compressor 28 Outdoor heat exchanger 30 Indoor heat exchanger 31 Restrictor 50a Controller 53 Central processing unit 59 Water temperature sensor 60 Comparison means

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takaaki Otsuka 3-1-1 Asahicho, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Mitsubishi Heavy Industries, Ltd. Air Conditioning Works (72) Inventor Minoru Hanai Iwazuka-cho, Nakamura-ku, Nagoya-shi No. 1 character highway, Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Harunobu Mizukami No. 1, Iwazuka-cho, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-6-58578 (JP, A) JP-A-60-44785 (JP, A) JP-A-1-131866 (JP, A) JP-A-64-38543 (JP, A) JP-A-4-260756 (JP, A) 58-43732 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 102 F24F 11/02 102 F25C 1/08

Claims (1)

(57) [Claims] 1. An outdoor unit including a compressor, an outdoor heat exchanger, and the like, and an indoor unit including an indoor heat exchanger, a throttle, and the like.
When ice thermal storage tank which is disposed an ice making heat transfer pipe or the like, the liquid refrigerant and a ice storage unit with a coolant pump for pumping at ice-cooling operation, the ice storage unit, the outdoor uni
Liquid refrigerant piping connecting the unit and the indoor unit and gas cooling
During the ice-making operation, the above-mentioned outdoor unit
Heat transfer tube for ice making in the ice storage tank
To make ice in the ice storage tank.
The gas refrigerant evaporated and vaporized in the indoor unit is stored on ice as described above.
The refrigerant is circulated through a heat transfer tube for ice making in the tank and condensed and liquefied.
Connected refrigerant to circulate through the pump to the indoor unit.
While connecting with a pipe, the compressor is operated and the outdoor unit is connected.
Cooling performed by circulating a refrigerant between the knit and the indoor unit
Chamber operation, operating the compressor, and the outdoor unit and the room
A heating operation performed by circulating a refrigerant between the internal units,
The compressor is operated, and the outdoor unit and the ice storage unit are operated.
Ice making operation by circulating the refrigerant between the heat transfer tubes for ice making
And stopping the compressor and turning on the refrigerant pump
Operate and cool between the indoor unit and the ice storage unit.
One of the operation modes of the ice melting cooling operation performed by circulating the medium
A selectable ice storage air conditioner of de, a water temperature sensor for detecting the temperature of the ice thermal storage tank, in the water temperature sensor
When the detected water temperature rises to a predetermined water temperature,
Determining that it has melted 0%, comparison means for determining termination of the ice-cooling operation, Shi performed thawed cooling operation in a predetermined time period
And a controller, wherein the controller is
At the end time of the ice melting cooling operation in a predetermined time zone,
If the comparing means has not decided to end the thaw cooling operation,
The ice melting / cooling operation is extended beyond the predetermined time period,
Do not have a function that can be continued until it is judged that 0% is melted.
Ice storage type air conditioner which is characterized in that that.