JP2000234771A - Secondary refrigerant heat-storing air-conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a secondary refrigerant heat-storing air-conditioning system for performing efficient operation even if a hydrocarbon refrigerant, an ammonium refrigerant, or the like is used by performing the operation of a heat exchange operation between cycles when a primary-side performs an operation in an air-conditioning operation mode. SOLUTION: In a primary-side refrigeration cycle, a heat exchanger 2 for primary- side outside and a heat exchanger 4 for primary-side inside are used as a condenser and an evaporator, respectively, and a primary refrigerant flows in the order of a compressor 1, a primary-side first three-way valve 7, a primary side heat exchanger 2 for outside, a first inflation valve 5, a primary-side second three-way valve 8, a second inflation valve 6, the primary-side heat exchanger 4 for inside, a first four-way valve 9, and the compressor 1 (air-conditioning operation mode). In a secondary-side transport cycle, chill is received by a secondary-side heat exchanger 12 for inside via the primary-side heat exchanger 4 for inside, and a secondary refrigerant flows in the order of the secondary-side heat exchanger 4 for inside, a circulation pump 13, a secondary-side secondary three-way valve 16, and the secondary-side heat exchanger 12 for inside (heat-exchange operation mode between cycles).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary refrigerant thermal storage air conditioning system, and more particularly to a secondary refrigerant using a highly flammable hydrocarbon refrigerant or a highly toxic ammonia refrigerant as a primary refrigerant. The present invention relates to a secondary refrigerant thermal storage air conditioning system using a refrigerant having substantially no flammability or toxicity such as water and brine.

[0002]

2. Description of the Related Art In recent years, global warming has received a great deal of attention, and the development of air conditioning systems using natural refrigerants instead of HFC-based refrigerants, which greatly affect global warming, is urgently required. In particular, the development of refrigerators and air-conditioning systems using hydrocarbon-based refrigerants and ammonia-based refrigerants that do not cause ozone layer destruction and do not affect global warming is expected to be promising.

[0003] A secondary refrigerant air-conditioning system is a technique that has been conventionally employed as a method for avoiding the dangers such as the flammability of hydrocarbon-based refrigerants and the toxicity of ammonia-based refrigerants. FIG. 17 shows a basic configuration diagram of a conventional secondary refrigerant system. In FIG. 17, the primary refrigerant encapsulates propane, a hydrocarbon-based refrigerant, and the secondary refrigerant encapsulates water.
2 is a primary-side external heat exchanger, 4 is a primary-side internal heat exchanger, 5 is a first expansion valve, 9 is a first four-way valve, 12 is a secondary-side internal heat exchanger, and 13 is a circulation unit. A pump 14 indicates a secondary-side indoor heat exchanger. The arrows in FIG. 17 indicate the flows of the primary refrigerant and the secondary refrigerant during the cooling operation.

At the time of cooling operation, the primary-side external heat exchanger 2
, A condenser 1, a first four-way valve 9, a primary-side external heat exchanger 2, a first expansion valve 5, a primary-side internal heat exchanger The secondary refrigerant flows through the heat exchanger 4, the first four-way valve 9, and the compressor 1 in this order. The secondary-side internal heat exchanger 12, the secondary-side indoor heat exchanger 14, and the circulation pump 13
During the heating operation, the primary refrigerant flows through the compressor 1, the first four-way valve 9, the primary side internal heat exchanger 2 as an evaporator and the primary side internal heat exchanger 4 as a condenser. Heat exchanger 4, the first expansion valve 5, the primary external heat exchanger 2, the first four-way valve 9, the compressor 1 flows in this order, the secondary refrigerant, the secondary internal heat exchanger 12, It flows in the order of the secondary side indoor heat exchanger 14 and the circulation pump 13.

At this time, the primary side internal heat exchanger 4 and the secondary side internal heat exchanger 12 perform heat exchange with each other to transfer the heat of the primary refrigerant to the secondary refrigerant, and to transfer heat through the secondary refrigerant. Is transported indoors to perform air conditioning.

On the other hand, energy efficiency (COP) competition is intensifying even though new refrigerants such as hydrocarbon-based refrigerants and ammonia-based refrigerants that do not affect global warming are being used, and safety is being increased. Development of a highly efficient air conditioning system and an air conditioning system that achieves power leveling by utilizing heat storage in response to an increase in peak power demand is also urgent.

As a countermeasure, an air conditioning system provided with a heat storage section is disclosed in, for example, Japanese Patent Application Laid-Open No. 54-121549. This realizes a high-efficiency refrigeration cycle by using the heat exchanger in the heat storage tank as a load side during the night to store heat and using the stored heat as a heat source during the day.

[0008] As a heat storage method, ice heat storage or heat storage by sensible heat of water is mainly used.

[0009]

However, in the aforementioned secondary refrigerant air conditioning system, it is necessary to exchange heat between the primary refrigerant and the secondary refrigerant as compared with the direct expansion type air conditioning system. In order to increase the number of times, in order to secure the required amount of heat on the air side, the primary-side refrigerant needs to have a lower evaporation temperature during cooling or a higher condensation temperature during heating, as compared with the direct expansion type. In general, depending on the size of the air conditioning system, the refrigerant in the direct expansion refrigeration cycle has a condensing temperature of 40 ° C. during cooling, an evaporating temperature of about 5 ° C., and a condensing temperature of about 40 ° C. during heating.
℃, the evaporation temperature is about 4 ℃.

On the other hand, in the secondary refrigerant air conditioning system, it is necessary to set the condensing temperature at the time of heating higher by about 5 ° C. or more and the evaporating temperature at the time of cooling lower by about 3 ° C. or more. That is, in the secondary refrigerant air conditioning system, the condensing temperature during the cooling operation is about 40 ° C., and the evaporating temperature is about 2
° C, the condensation temperature during heating operation is about 45 ° C, and the evaporation temperature is about 4
° C. Therefore, in addition to an increase in the primary-side input, power such as a circulation pump for circulating the secondary refrigerant is indispensable, and the overall COP is significantly reduced both during cooling and during heating.

In the example of the heat storage air conditioning system disclosed in Japanese Patent Application Laid-Open No. 54-121549, a direct expansion type air conditioning system ensures a high COP, but uses a natural refrigerant for the primary refrigeration cycle. However, as described above, there is a problem that it cannot be easily flowed into a room due to the problem of flammability and toxicity.

[0012] Regarding the substance used as a heat storage material, in the case of ice heat storage, it is necessary to operate a refrigeration cycle at an evaporation temperature of 0 ° C. or less for ice making, so that the overall efficiency is reduced and water is stored. The sensible heat storage method has a drawback that a large amount of water is required to store sufficient heat, so that the equipment scale is increased. In other words, there have been few proposals for substances that are small but can store sufficient latent heat and that apply only natural substances that do not affect the global environment.

The present invention takes into account the problems of the conventional secondary refrigerant air conditioning system and thermal storage air conditioning system described above, and has an effect on the secondary refrigerant thermal storage air conditioning system that can operate efficiently, and in particular, has an effect on global warming. It is an object of the present invention to provide a secondary refrigerant thermal storage air-conditioning system that can operate efficiently even when a new refrigerant such as a hydrocarbon-based refrigerant or an ammonia-based refrigerant that is not provided is used.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a compressor, a primary external heat exchanger, a primary heat storage unit heat exchanger, a primary internal heat exchanger, and a throttle device. And a primary cycle in which a primary refrigerant is sealed, a circulating pump, a secondary-side indoor heat exchanger, a secondary-side heat storage unit heat exchanger, and a secondary-side internal A heat exchanger and a secondary cycle switching means, a secondary cycle in which a secondary refrigerant is sealed, a heat storage material is sealed, and the heat storage material is a heat exchanger for the primary heat storage section and A heat storage unit for storing heat by transferring heat to and from the secondary-side heat storage unit heat exchanger, wherein the primary-side internal heat exchanger and the secondary-side internal heat exchanger exchange heat. And the primary cycle is used as the compressor → condenser. The primary-side external heat exchanger is circulated in the order of a secondary-side external heat exchanger → the expansion device → the primary-side heat storage unit heat exchanger used as an evaporator → the compressor, in this order. The heat-exchanger discharges heat to the outside, and the primary-side heat storage unit heat exchanger stores cold heat in the heat storage unit. The cold storage operation mode, the compressor → the primary-side external heat exchanger used as a condenser → the throttle By circulating the primary refrigerant in order of the device → the primary-side internal heat exchanger used as the evaporator → the compressor, the primary-side external heat exchanger emits heat to the outside, and the primary A first cooling operation mode in which a side internal heat exchanger transfers cold heat to the secondary refrigerant via the secondary side internal heat exchanger, and a heat exchange for the primary heat storage unit used as the compressor → condenser Device → the expansion device → evaporator When the primary refrigerant circulates in the order of the primary-side internal heat exchanger → the compressor, the primary-side heat storage unit heat exchanger releases heat to the heat storage material, and the primary-side internal heat exchanger. The heat exchanger for cooling has two operation modes of a second cooling operation mode for transmitting cold heat to the secondary refrigerant via the heat exchanger for internal use on the secondary side, and the operation by the primary side flow switching means. The mode is switched, the operation is performed, and the secondary cycle is performed in the order of the secondary internal heat exchanger → the secondary indoor heat exchanger → the secondary internal heat exchanger. The secondary refrigerant circulates on the way through the circulation pump, so that the secondary-side internal heat exchanger uses the cold heat received from the primary-side internal heat exchanger, Inter-cycle heat exchange operation to cool the room with the indoor heat exchanger Mode, the secondary-side heat storage unit heat exchanger → the secondary-side indoor heat exchanger → the secondary-side heat storage unit heat exchanger, in this order:
Through the circulation pump on the way, the secondary refrigerant is circulated, so that the secondary-side heat storage unit heat exchanger receives the cold heat received from the heat storage material by the secondary-side indoor heat exchanger through the room. It has two operation modes of a heat storage utilization operation mode for cooling, and the operation mode is switched by the secondary side flow path switching means to perform an operation, and the primary cycle is the first cooling operation mode or the When the operation in the second cooling operation mode is performed, the operation in the inter-cycle heat exchange operation mode is performed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic configuration diagram showing a secondary refrigerant heat storage air conditioning system according to a first embodiment of the present invention. The secondary refrigerant thermal storage air conditioning system in the present embodiment uses propane of a hydrocarbon-based refrigerant as a primary refrigerant, water as a secondary refrigerant, and a mixture of propane and water of a hydrocarbon-based refrigerant is sealed as a heat storage material. Is what it is.

In the primary refrigeration cycle (corresponding to the primary cycle of the present invention), a compressor 1, a primary external heat exchanger 2, a primary heat storage unit heat exchanger 3, a primary internal heat exchanger. 4, a first expansion valve 5 (corresponding to the first throttle device of the present invention), a second expansion valve 6 (corresponding to the second throttle device of the present invention), a first three-way valve 7, and a second It comprises a three-way valve 8 and a first four-way valve 9, each of which is connected by a connection pipe. The first expansion valve 5 and the second expansion valve 6
Corresponds to the throttle device of the present invention, and the first three-way valve 7, the second three-way valve 8, and the first four-way valve 9 correspond to the primary-side flow switching means of the present invention. is there.

In the secondary heat transfer cycle (corresponding to the secondary cycle of the present invention), the heat exchanger 1 for the secondary heat storage unit is used.
1, a secondary internal heat exchanger 12, a circulation pump 13, a secondary indoor heat exchanger 14, a third three-way valve 15, and a fourth three-way valve 16, each of which is connected by a connection pipe. ing. The third three-way valve 15 and the fourth three-way valve 16 correspond to the secondary-side flow switching means of the present invention.

The heat exchanger 3 for the primary heat storage unit and the heat exchanger 11 for the secondary heat storage unit are installed in a heat storage tank 10 (corresponding to the heat storage unit of the present invention). Exchange of heat can be performed.

That is, the secondary refrigerant thermal storage air-conditioning system according to the present embodiment includes a primary refrigeration cycle, a secondary heat transfer cycle, and a heat storage tank, and is a system configuration of a secondary refrigerant thermal storage air-conditioning system dedicated to cooling. Is shown.

Here, the pressure in the heat storage tank in which propane and water are sealed is maintained at about 500 kPa. Under the above-mentioned pressure, propane and water are charged at a temperature of about 5 ° C. and a latent heat quantity of about 90 kcal / kg.
Can generate a clathrate and store cold energy.

All the components of the primary refrigeration cycle and the secondary indoor heat exchanger 14 of the secondary heat transfer cycle
And all the heat storage tanks 10 are housed inside the outdoor unit and installed outside the room, and only the indoor unit including the secondary-side indoor heat exchanger 14 is installed inside the room. I have.

The secondary refrigerant thermal storage air conditioning system according to the present embodiment has four operation patterns, and the operation state of each device and the state of the three-way valve and the four-way valve are switched according to each operation pattern. The cold heat storage operation and the cooling operation are performed in the first to fourth operation patterns.

The flow of the primary refrigerant in the first operation pattern is shown by a thick line in FIG. The first operation pattern is performed at the time of cold heat storage during the nighttime, when the indoor cooling operation is not required.

The primary-side refrigeration cycle includes a compressor 1, a primary first three-way valve 7, a primary-side external heat exchanger 2 as a condenser, and a primary-side heat storage unit heat exchanger 3 as an evaporator. Primary refrigerant flows in the following order: heat exchanger 2, first expansion valve 5, primary-side second three-way valve 8, primary-side heat storage unit heat exchanger 3, first four-way valve 9, and compressor 1. Cold storage operation mode),
In the secondary heat transfer cycle, the circulation pump 13 is stopped, so that the secondary refrigerant is not flowing at all.

According to the first operation pattern, the temperature in the heat storage tank 10 is reduced to about 5 ° C. or less in a time zone in which nighttime heat demand is small (for example, this can be made to correspond to a predetermined time zone of the present invention). By generating a propane and water clathrate at the temperature, cold energy can be stored.

FIG. 3 schematically shows a Mollier diagram in the operation of the primary refrigeration cycle at this time. FIG. 3 shows a refrigeration cycle in which a cold storage operation is performed at a nighttime outside air temperature of 30 ° C., a heat storage temperature of 5 ° C., a refrigeration cycle condensation temperature of 35 ° C., and a refrigeration cycle evaporation temperature of 2 ° C.
As can be seen from FIG. 3, the difference between the evaporating temperature and the condensing temperature in the first operation pattern is smaller than the difference between the evaporating temperature and the condensing temperature of the conventional secondary refrigerant system, so that efficient operation can be performed.

Further, the primary side refrigeration cycle is operated mainly by using nighttime electric power, and since the outside air temperature is lower at nighttime than at daytime, the electricity cost is lower.

The flow of the secondary refrigerant in the second operation pattern is shown by a thick line in FIG. The second operation pattern is a daytime time period during which indoor cooling operation is required, and the heat storage material generates a clathrate of about 5 ° C. in the heat storage tank according to the first operation pattern to generate cold heat. It is performed in a stored state (corresponding to "a case where the difference between the temperature of the heat storage material and the outside air temperature is equal to or more than a predetermined value").

At this time, in the primary refrigeration cycle, the operation of the compressor 1 is stopped, and the primary refrigerant is not flowing at all.

In the secondary heat transfer cycle, the secondary refrigerant which has received the cold heat from the heat storage material via the secondary heat storage unit heat exchanger 11 in the heat storage tank 10 is converted into the secondary heat storage unit heat exchanger 11. , The secondary-side first three-way valve 15, the secondary-side indoor heat exchanger 14, the circulation pump 13, the secondary-side second three-way valve 16, and the secondary-side heat storage unit heat exchanger 11 in this order (the present invention). (Corresponding to the heat storage operation mode) to transfer the cold heat to the room and perform the cooling operation. With this operation, the heat storage material in the heat storage tank 10 releases the latent heat of the clathrate and melts, and further releases sensible heat to increase the temperature.

At this time, since the primary side refrigeration cycle is stopped, no electric power is required, and the cooling operation can be performed with extremely small electric power from the circulation pump 13 for circulating the secondary refrigerant, the fan, and the like. Efficient operation can be performed.

The room temperature is maintained at about 27 ° C., and the heat storage material in the heat storage tank 10 absorbs heat to melt the clathrate and increase the temperature. However, air conditioning can be performed using the cold heat transferred in the secondary heat transfer cycle. For example, the temperature of the heat storage material is 10 ° C.
The second operation pattern is maintained as long as the following.

The flows of the primary refrigerant and the secondary refrigerant in the third operation pattern are shown by thick lines in FIG. The third operation pattern is a time period in the daytime when indoor cooling operation is required, and the temperature of the heat storage material in the heat storage tank 10 is substantially higher than 10 ° C and lower than the outside air temperature of 35 ° C (average temperature). The heat storage temperature is kept at 22.5 ° C. (corresponding to “if the difference between the temperature of the heat storage material and the outside air temperature is smaller than a predetermined value and larger than another predetermined value” in the present invention).

The primary side refrigerating cycle comprises a compressor 1, a primary side first three-way valve 7, a first side three-way valve 7, a primary side heat storage section heat exchanger 3 as a condenser and a primary side internal heat exchanger 4 as an evaporator. A four-way valve 9, a heat exchanger 3 for the primary heat storage unit, a second secondary three-way valve 8,
The primary refrigerant flows in the order of the second expansion valve 6, the primary-side internal heat exchanger 4, the first four-way valve 9, and the compressor 1 (corresponding to the second cooling operation mode of the present invention), and the secondary-side heat transfer. In the cycle, the secondary-side internal heat exchanger 12 receives cold heat via the primary-side internal heat exchanger 4, and the secondary refrigerant is supplied to the secondary-side internal heat exchanger 1.
2. Secondary first three-way valve 15, Secondary indoor heat exchanger 1.
4. Circulation pump 13, secondary second three-way valve 16, and secondary internal heat exchanger 12 flow in this order (corresponding to the inter-cycle heat exchange operation mode of the present invention) to convey cold to the room and cool. Driving.

With this operation, the heat storage material in the heat storage tank 10 absorbs heat due to the condensation of the primary refrigerant flowing through the heat exchanger 3 for the primary heat storage unit, and the temperature rises.

FIG. 6 schematically shows a Mollier diagram in the operation of the primary refrigeration cycle at this time. In FIG. 6, the outside air temperature is 35 ° C., the air conditioning temperature is 27 ° C., the average heat storage temperature in the heat storage tank 10 is 22.5 ° C., the average evaporation temperature of the primary refrigeration cycle is about 5 ° C., and the average of the primary refrigeration cycle. 4 shows a refrigeration cycle for performing a cooling operation at a condensing temperature of about 27.5 ° C.

At this time, the evaporation temperature of the primary side refrigeration cycle is the same as that of the conventional example of the direct expansion type refrigeration cycle, but the condensation temperature is the same as that of the direct expansion type refrigeration cycle. Since the temperature can be much lower than 40 ° C., the input on the primary side is suppressed compared to the conventional direct expansion refrigeration cycle and the secondary refrigerant system, and efficient operation can be performed.

The indoor temperature is maintained at about 27 ° C., and the heat storage material in the heat storage tank 10 absorbs heat to increase the temperature of the entire heat storage material. However, as long as the temperature of the heat storage material is lower than the outside air temperature, the third temperature is maintained. Maintain the driving pattern of

It should be noted that the third operation pattern is a case in which indoor cooling is performed at night, and the heat storage material is kept at a temperature lower than the outside air temperature in the heat storage tank 10 (the temperature of the heat storage material of the present invention). The difference between the temperature and the outside air temperature is larger than another predetermined value), the efficiency of the operation can be improved because the condensation temperature in the refrigeration cycle can be kept low as described above. Can be done.

FIG. 7 shows the flows of the primary refrigerant and the secondary refrigerant in the fourth operation pattern. The fourth operation pattern is a time period in the daytime during which the indoor cooling operation is required, and when the temperature of the heat storage material in the heat storage tank 10 becomes equal to the outside air temperature (“the heat storage material of the present invention”). If the difference between the temperature and the outside air temperature is equal to or less than another predetermined value "), the operation is the same as that of the conventional secondary refrigerant system. Note that the fourth operation pattern is a time period during which the indoor cooling operation is required even at night,
The operation is also performed when the temperature of the heat storage material in the heat storage tank 10 becomes equal to the outside air temperature.

The primary refrigerating cycle comprises a compressor 1, a primary first three-way valve 7, a primary external heat exchanger 2 as a condenser and a primary internal heat exchanger 4 as an evaporator. Heat exchanger 2, first expansion valve 5, primary-side second three-way valve 8, second expansion valve 6, primary-side internal heat exchanger 4, first four-way valve 9,
The primary refrigerant flows in the order of the compressor 1 (corresponding to the first cooling operation mode of the present invention), and the secondary heat transfer cycle is performed by the secondary internal heat exchanger 12 via the primary internal heat exchanger 4. And the secondary refrigerant is supplied to the secondary-side internal heat exchanger 12, the secondary-side first three-way valve 15, the secondary-side indoor heat exchanger 14, the circulation pump 13, and the secondary-side second three-way valve 16 , Flows in the order of the secondary-side internal heat exchanger 12 (corresponding to the inter-cycle heat exchange operation mode of the present invention), thereby transferring the cold to the room and performing the cooling operation.

FIG. 8 schematically shows a Mollier diagram in the operation of the primary refrigeration cycle at this time. FIG. 8 shows a refrigeration cycle in which the cooling operation is performed at an outside air temperature of 35 ° C., an air conditioning temperature of 27 ° C., a refrigeration cycle evaporation temperature of about 5 ° C., and a refrigeration cycle condensation temperature of 40 ° C.

Although the condensing temperature and the evaporating temperature in the operation pattern at this time are the same as those of the conventional secondary refrigerant system, the operation time according to the fourth operation pattern is shorter than that of the conventional system, so that the efficiency of the entire operation time is as follows. Will be improved.

As described above, in performing the cooling operation, the first operation pattern to the fourth operation pattern are switched in consideration of the difference between the time zone, the temperature of the heat storage material in the heat storage tank 10, and the outdoor temperature. To perform steady-state operation of the primary-side refrigeration cycle of 5 ° C on the evaporator side and 40 ° C on the condensing side as seen in the conventional cooling operation, while safely using earth-friendly refrigerants using natural refrigerants. On the other hand, the average condensing temperature can be made much lower, which makes it possible to operate the secondary refrigerant system very efficiently.

The heat storage tank 10 is used to perform a heat storage operation at night, and the heat storage tank 1 is operated during the daytime when the power load is highest.
Combining an operation that uses the heat stored in the heat storage tank 10 instead of the outdoor air or the like with the secondary refrigerant air conditioning system in combination with the operation that directly uses the cold heat in the refrigeration chamber 0, the flammability that is considered to be a natural refrigerant problem Sex and toxicity issues are resolved,
Peak cuts in daytime power loads can also be made. Furthermore, the heat storage material using the clathrate according to the present invention can store a large amount of heat even if it is small because it stores heat using latent heat, as compared with a heat storage material using sensible heat using water or the like.

At this time, the size of the heat storage tank 10, the amount of the heat storage material to be enclosed, and the temperature and pressure at which the latent heat is generated by the clathrate are not uniquely determined. Etc. are set independently.

At this time, the heat exchanger 11 for the secondary-side heat storage unit does not perform indirect heat exchange through a pipe such as copper as shown in FIG. The heat storage tank 10 is circulated to the secondary heat transfer cycle by a direct heat exchange method.
The form which conveys the cold in a room may be taken.

It is to be noted that the secondary refrigerant heat storage air conditioning system in the present embodiment has been described as being exclusively used for cooling, but it is further provided with a second four-way valve (the configuration of FIG. 15 described later).
The same heating operation as the conventional secondary refrigerant system can be used.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
An embodiment will be described with reference to the drawings. The secondary refrigerant thermal storage air-conditioning system according to the present embodiment is the same as the secondary refrigerant thermal storage air-conditioning system according to the first embodiment described above, except that the secondary refrigerant thermal storage air conditioning system also serves as a heating operation. Therefore, in the present embodiment, parts that are not particularly described are the same as those in the first embodiment, and those components that are assigned the same reference numerals as those in the first embodiment are unless otherwise specified. Have the same functions as those of the first embodiment. Unless otherwise stated, each modification described in the first embodiment is applied to the present embodiment by performing the same modification.

FIG. 9 is a schematic configuration diagram showing a secondary refrigerant heat storage air conditioning system according to the second embodiment of the present invention.
In the secondary refrigerant heat storage air conditioning system in the present embodiment,
A hydrocarbon-based refrigerant, propane, is used as a primary refrigerant, and water is used as a secondary refrigerant. A mixture of ethane, propane, and water, which are hydrocarbon-based refrigerants, is sealed as a heat storage material.

In the primary refrigeration cycle (corresponding to the primary cycle of the present invention), a compressor 1, a primary external heat exchanger 2, a primary heat storage unit heat exchanger 3, and a primary internal heat exchanger. 4, a first expansion valve 5 (corresponding to the first throttle device of the present invention), a second expansion valve 6 (corresponding to the second throttle device of the present invention), a first three-way valve 7, and a second It comprises a three-way valve 8, a first four-way valve 9, and a second four-way valve 17, each of which is connected by a connection pipe. The first expansion valve 5 and the second expansion valve 6 correspond to the throttle device of the present invention, and include a first three-way valve 7, a second three-way valve 8, a first four-way valve 9, The second four-way valve 17 corresponds to the primary-side flow switching means of the present invention.

In the secondary heat transfer cycle (corresponding to the secondary cycle of the present invention), the heat exchanger 1 for the secondary heat storage section is used.
1, a secondary internal heat exchanger 12, a circulation pump 13, a secondary indoor heat exchanger 14, a third three-way valve 15, and a fourth three-way valve 16, each of which is connected by a connection pipe. ing. The third three-way valve 15 and the fourth three-way valve 16 correspond to the secondary-side flow switching means of the present invention.

The heat exchanger 3 for the primary heat storage unit and the heat exchanger 11 for the secondary heat storage unit are installed in a heat storage tank 10 (corresponding to the heat storage unit of the present invention). Exchange of heat can be performed.

That is, the secondary refrigerant thermal storage air-conditioning system according to the present embodiment comprises a primary refrigeration cycle, a secondary heat transfer cycle, and a thermal storage tank.
7 shows a system configuration of a secondary refrigerant thermal storage air-conditioning system that performs both cooling operation and heating operation by switching of 7.

Here, the pressure in the heat storage tank in which propane, ethane and water are sealed is maintained at about 1000 kPa, and the mixture of ethane and propane and water are
At about 15 ° C., a clathrate having a latent heat quantity of about 100 kcal / kg can be generated to store cold heat.

All the components of the primary refrigeration cycle and the secondary indoor heat exchanger 14 of the secondary heat transfer cycle
All the heat storage tanks 10 except for the above and the heat storage tank 10 are all housed in an outdoor unit outside and installed outside, and only the indoor unit including the secondary-side indoor heat exchanger is installed indoors.

In the secondary refrigerant thermal storage air conditioning system of this embodiment, there are four types of operation patterns for the cooling operation and the heating operation, respectively. In the cooling operation, the compressor is operated by switching the second four-way valve 17. From the first discharge unit to the primary side
By setting the flow of the refrigerant to the three-way valve 7 and the flow of the refrigerant from the first four-way valve 9 to the suction part of the compressor 1, the clathrate generation temperature in the heat storage material in the heat storage tank 10 is different, but the primary The flow pattern of the refrigerant and the secondary refrigerant is
Since it is completely the same as the secondary refrigerant thermal storage air conditioning system in the first embodiment, the description is omitted.

As described above, during the heating operation of the secondary refrigerant thermal storage air-conditioning system in the present embodiment, there are four operation patterns from the fifth operation pattern to the eighth operation pattern. The operating state of each device and the states of the three-way valve and the four-way valve are switched.

The flow of the primary refrigerant in the fifth operation pattern is shown by the thick line in FIG. The fifth operation pattern is performed at the time of thermal storage during the night, when the indoor heating operation is not required.

The primary-side refrigeration cycle includes a compressor 1, a second four-way valve 17, a first four-way valve, using the primary-side external heat exchanger 2 as an evaporator and the primary-side heat storage unit heat exchanger 3 as a condenser. Valve 9,
Primary side heat storage unit heat exchanger 3, primary side second three-way valve 8, first
The primary refrigerant flows in the order of the expansion valve 5, the primary external heat exchanger 2, the primary first three-way valve 7, the second four-way valve 17, and the compressor 1 (corresponding to the temperature storage operation mode of the present invention), In the secondary heat transfer cycle, the circulation pump 13 is stopped, so that the secondary refrigerant is not flowing at all.

According to the fifth operation pattern, in the heat storage tank 10 at a temperature of about 45 ° C. or more during the night time when heat demand is low (for example, this can be made to correspond to the predetermined time period of the present invention). At this temperature, heat can be stored as hot water.

FIG. 11 schematically shows a Mollier diagram in the operation of the primary refrigeration cycle at this time. In FIG.
The refrigeration cycle in which the heating operation is performed when the outside air temperature at night is 5 ° C., the evaporation temperature of the refrigeration cycle is about 2 ° C., and the condensation temperature of the refrigeration cycle is 50 ° C.

At this time, the difference between the condensing temperature of 50 ° C. and the evaporating temperature of 2 ° C. in the primary refrigeration cycle is slightly larger than that of the conventional secondary refrigerant system during the daytime operation. Although it has declined, since it operates using nighttime electricity, the electricity bill becomes cheaper,
By effectively utilizing the heat storage in this time zone for the sixth to eighth daytime operation patterns described later, the efficiency is improved as a whole during the heating period.

The flow of the secondary refrigerant in the sixth operation pattern is shown by the thick line in FIG. The sixth operation pattern is a daytime period during which the indoor heating operation is required, and the heat storage material is kept in the heat storage tank 10 as warm water of about 45 ° C. or higher by the fifth operation pattern. (Corresponding to “a case where the difference between the temperature of the heat storage material and the outside air temperature is equal to or more than a predetermined value”).

At this time, the primary refrigeration cycle is
Is stopped, and the primary refrigerant is not flowing at all.

In the secondary heat transfer cycle, the secondary refrigerant, which has received the heat from the heat storage material via the secondary heat storage unit heat exchanger 11 in the heat storage tank 10, is converted into the secondary heat storage unit heat exchanger 11 , The secondary-side first three-way valve 15, the secondary-side indoor heat exchanger 14, the circulation pump 12, the secondary-side second three-way valve 16, and the secondary-side heat storage unit heat exchanger 11. (It corresponds to the heat storage operation mode) to transfer the heat to the room and perform the heating operation. By this operation, the heat storage material in the heat storage tank 10 emits heat and the temperature drops.

At this time, since the primary side refrigeration cycle is stopped, no electric power is required, and the heating operation can be performed with extremely small electric power from the circulation pump 13 for circulating the secondary refrigerant, the fan, and the like. Good driving can be performed. The indoor temperature is maintained at about 20 ° C., and the heat storage material in the heat storage tank 10 radiates heat and the temperature rises. However, only the amount that can be air-conditioned by the heat transferred in the secondary heat transfer cycle (for example, the heat storage material) 6) as long as the temperature of the
Maintain the driving pattern of

The flows of the primary refrigerant and the secondary refrigerant in the seventh operation pattern are shown by thick lines in FIG. The seventh operation pattern is a daytime period during which the indoor heating operation is required, and the heat storage material in the heat storage tank 10 is maintained at a temperature substantially lower than 40 ° C. and higher than the outside air temperature 7 ° C. This shows a leaned state.

The primary-side refrigeration cycle uses the heat exchanger 3 for the primary-side heat storage unit as an evaporator, the heat exchanger 4 for the primary-side internal as a condenser, the compressor 1, the second four-way valve 17, and the first four-way valve. 9, a primary side internal heat exchanger 4, a second expansion valve 6, a primary side second three-way valve 8, a primary side heat storage unit heat exchanger 3, a first four-way valve 9,
The primary refrigerant flows in the order of the primary first three-way valve 7, the second four-way valve 17, and the compressor 1 (corresponding to the second heating operation mode of the present invention). Heat is received by the heat exchanger 12 via the primary-side internal heat exchanger 4, and the secondary refrigerant is supplied to the secondary-side internal heat exchanger 12 and the secondary-side first heat exchanger 12.
Three-way valve 15, secondary-side indoor heat exchanger 14, circulation pump 1
3. Secondary side second three-way valve 16, Secondary side internal heat exchanger 12
(Corresponding to the inter-cycle heat exchange operation mode of the present invention) to transfer the heat to the room and perform the heating operation.

By this operation, the heat storage material in the heat storage tank 10 emits heat by the evaporating action of the primary refrigerant flowing through the heat exchanger 3 for the primary side heat storage unit, and the temperature falls. However, the heat storage tank 10
Inside, the cold heat released by the primary refrigerant in the heat exchanger for the primary heat storage unit is used as latent heat for clathrate generation of a mixture of propane and butane, so the temperature stays around 15 ° C and the clathrate is sufficiently generated. After that, the temperature of the entire heat storage material falls again. Therefore, the amount of heat actually radiated in the heat storage tank 10 is larger than the temperature difference of the heat storage material.

FIG. 14 schematically shows a Mollier chart in the operation of the primary refrigeration cycle at this time. In FIG.
The average temperature of the heat storage material in the heat storage tank 10 is 15 ° C., the evaporation temperature of the refrigeration cycle is about 12 ° C., and the condensation temperature of the refrigeration cycle is 4
The refrigeration cycle which performs a heating operation at 5 ° C. is shown.

At this time, the condensation temperature of the primary side refrigeration cycle is the same as that of the conventional secondary refrigerant refrigeration cycle, but the evaporation temperature is much higher than the evaporation temperature of about 4 ° C. at the time of heat exchange with the outside air. As a result, the input on the primary side is suppressed as compared with the conventional secondary refrigerant system, and efficient operation can be performed.

The indoor temperature is maintained at about 20 ° C., and the heat storage material in the heat storage tank 10 radiates heat to lower the temperature of the entire heat storage material. However, as long as the temperature of the heat storage material is higher than the outside air temperature, the seventh temperature is maintained. Maintain the driving pattern of

It is to be noted that the seventh operation pattern is a case where room heating is performed at night, and a state in which the heat storage material is maintained at a temperature higher than the outside air temperature in the heat storage tank 10 (the “temperature of the heat storage material” in the present invention). In the case where the difference between the temperature and the outside air temperature is larger than another predetermined value), it is possible to perform an efficient operation by increasing the evaporation temperature in the refrigeration cycle in the same manner as described above.

The flows of the primary refrigerant and the secondary refrigerant in the eighth operation pattern are shown by thick lines in FIG. The eighth operation pattern is a time period in the daytime when the indoor heating operation is required, and when the temperature of the heat storage material in the heat storage tank 10 becomes equal to the outside air temperature (“the heat storage material of the present invention”). If the difference between the temperature and the outside air temperature is equal to or less than another predetermined value "), the operation is the same as that of the conventional secondary refrigerant system. The eighth operation pattern is also performed at night, during a time period during which the indoor heating operation is required, and when the temperature of the heat storage material in the heat storage tank 10 becomes equal to the outside air temperature.

The primary-side refrigeration cycle includes a compressor 1, a second four-way valve 17, and a first four-way valve, using the primary-side external heat exchanger 2 as an evaporator and the primary-side internal heat exchanger 4 as a condenser. 9, a primary internal heat exchanger 4, a second expansion valve 6, a primary second three-way valve 8, a first expansion valve 5, a primary external heat exchanger 2, a primary first three-way valve 7, The primary refrigerant flows in the order of the second four-way valve 17 and the compressor 1 (corresponding to the first heating operation mode of the present invention), and the secondary heat transfer cycle is performed by the secondary internal heat exchanger 12 using the primary internal heat exchanger 12. Heat is received through the internal heat exchanger 4, and the secondary refrigerant is supplied to the secondary internal heat exchanger 12 and the secondary first heat exchanger.
Three-way valve 15, secondary-side indoor heat exchanger 14, circulation pump 1
3. Secondary side second three-way valve 16, Secondary side internal heat exchanger 12
(Corresponding to the inter-cycle heat exchange operation mode of the present invention) to transfer the heat to the room and perform the heating operation.

FIG. 16 schematically shows a Mollier chart in the operation of the primary refrigeration cycle at this time. In FIG.
The outside air temperature is 7 ° C and the average evaporation temperature of the refrigeration cycle is about 4
The refrigeration cycle which performs the heating operation when the condensation temperature of the refrigeration cycle is 45 ° C is shown.

As described above, in performing the heating operation, by switching the operation pattern 5 to the operation pattern 8 in consideration of the difference between the time zone, the temperature of the heat storage material in the heat storage tank 10 and the outdoor temperature, the natural refrigerant can be used. It is an average for steady operation of the primary refrigeration cycle of 4 ° C on the evaporating side and 45 ° C on the condensing side as seen in the conventional heating operation, while safely using the used environmentally friendly refrigerant. It is possible to take a much lower evaporating temperature, and it is possible to operate the secondary refrigerant system at a very high efficiency. Of course, even during cooling, as in the conventional example, it is possible to operate the secondary refrigerant system with extremely high efficiency.

The heat storage tank 10 is used to perform a heat storage operation at night, and the heat storage tank 1 is operated during the daytime when the power load is highest.
By combining the operation using the cooling heat during cooling or the heating heat during heating directly with the secondary refrigerant air conditioning system with the operation using the heat stored in the heat storage tank 10 in place of the outdoor air or the like, the natural refrigerant is used. In addition to solving the problems of flammability and toxicity, which are problems of the present invention, it is also possible to perform a peak cut of the power load in the daytime. Furthermore, in the heat storage material using clathrate according to the present invention, a large amount of heat can be stored even in a small size because heat is stored using latent heat, even when compared with a heat storage material using sensible heat using water or the like.

At this time, the scale of the heat storage tank 10, the amount of the heat storage material to be enclosed, and the temperature and pressure at which the latent heat is generated by the clathrate are not uniquely determined. Etc. are set independently.

The freezing point of the clathrate varies between about 5 and 20 ° C. depending on the mixing ratio of propane and ethane.
At which temperature the clathrate is set to be generated is set by the ratio of emphasis on cooling and the ratio of emphasis on heating as heat storage. Further, a mixture of propane and ethane may be further mixed with a substance such as sodium chloride to further lower the temperature at which clathrate is formed by lowering the freezing point.

In the first embodiment described above, a secondary refrigerant heat storage air conditioning system dedicated to cooling will be described. In the second embodiment described above, a secondary refrigerant heat storage air conditioning system used for both cooling and heating will be described. As explained, FIG.
By changing the connection of the first four-way valve 9 of the configuration of the secondary refrigerant thermal storage air conditioning system in the first embodiment shown in the above, it is possible to realize a secondary refrigerant thermal storage air conditioning system dedicated to heating. it can. This secondary refrigerant thermal storage air conditioning system dedicated to heating is not as efficient as a secondary refrigerant thermal storage air conditioning system dedicated to cooling or for both cooling and heating. The efficiency can be improved.

In the first and second embodiments described above, the expansion device of the present invention is constituted by a plurality of expansion valves, and a plurality of three-way valves, a single or a plurality of four-way valves, and piping are used. Although the description has been made assuming that the primary-side flow switching means is configured and the plurality of three-way valves and pipes configure the secondary-side flow switching means of the present invention, the invention is not limited thereto. In short, the secondary refrigerant thermal storage air conditioning system of the present invention
A primary side having a compressor, a primary-side external heat exchanger, a primary-side heat storage unit heat exchanger, a primary-side internal heat exchanger, a throttling device, and a primary-side flow switching means, in which a primary refrigerant is sealed. It has a cycle, a circulating pump, a secondary-side indoor heat exchanger, a secondary-side heat storage unit heat exchanger, a secondary-side internal heat exchanger, and a secondary-side flow path switching unit. The heat storage material is sealed, and the heat storage material exchanges heat with the heat exchanger for the primary heat storage unit and the heat exchanger for the secondary heat storage unit, thereby storing heat. And a heat storage unit for performing the heat transfer, wherein the primary-side internal heat exchanger and the secondary-side internal heat exchanger are arranged so as to be able to exchange heat, and in a cooling operation, the primary cycle includes the compressor. → The primary external heat exchanger used as a condenser → The throttling device → Evaporator By the primary refrigerant circulating in the order of the used heat exchanger for the primary heat storage unit → the compressor, the external heat exchanger for the primary side emits heat to the outside, and for the primary heat storage unit. A cold storage operation mode in which a heat exchanger stores cold heat in the heat storage unit, the compressor → the primary external heat exchanger used as a condenser → the throttling device → the primary internal heat exchanger used as an evaporator → by the primary refrigerant circulating in the order of the compressor,
A first cooling operation mode in which the primary-side external heat exchanger emits heat to the outside, and the primary-side internal heat exchanger transmits cold heat to the secondary refrigerant via the secondary-side internal heat exchanger ,
The primary refrigerant circulates in the order of the compressor → the heat exchanger for the primary heat storage section used as a condenser → the expansion device → the heat exchanger for the primary side used as an evaporator → the compressor. Thereby, the heat exchanger for the primary side heat storage unit emits heat to the heat storage material, and the heat exchanger for the primary side internal cools the secondary refrigerant through the heat exchanger for the secondary side internal heat. A second cooling operation mode to be conveyed. The operation mode is switched by the primary-side flow switching means, and the secondary cycle is operated by the primary-side flow switching means. The secondary refrigerant is circulated on the way through the circulation pump in the order of an exchanger → the secondary-side indoor heat exchanger → the secondary-side internal heat exchanger. The internal heat exchanger receives the heat from the primary internal heat exchanger. Using the cold heat taken, the inter-cycle heat exchange operation mode for cooling the room by the secondary-side indoor heat exchanger, the secondary-side heat storage unit heat exchanger → the secondary-side indoor heat exchanger → the In the order of the secondary-side heat storage unit heat exchanger, the secondary refrigerant is circulated on the way through the circulation pump, so that the secondary-side heat storage unit heat exchanger receives from the heat storage material. It has two operation modes, a heat storage utilization operation mode for cooling the room by the secondary side indoor heat exchanger, and the operation mode is switched by the secondary flow path switching means to perform operation. The primary cycle is in the first cooling operation mode or the second cooling mode.
When the operation in the cooling operation mode is performed, it is sufficient that the operation in the inter-cycle heat exchange operation mode is performed.

When the heating operation is performed, the compressor → the heat exchanger for the primary heat storage section used as a condenser → the throttling device → the heat exchanger for the primary external used as an evaporator → By circulating the primary refrigerant in the order of the compressor, the primary-side external heat exchanger absorbs heat from the outside, and the primary-side heat storage unit heat exchanger stores heat in the heat storage unit. The operation mode, the compressor → the primary side internal heat exchanger used as a condenser → the expansion device → the primary side external heat exchanger used as an evaporator → the compressor, the primary refrigerant in this order. By circulating, the primary-side external heat exchanger absorbs heat from the outside, and the primary-side internal heat exchanger transmits heat to the secondary refrigerant via the secondary-side internal heat exchanger. 1st heating operation mode, said The primary refrigerant circulates in the order of a compressor → the primary-side internal heat exchanger used as a condenser → the expansion device → the primary-side heat storage unit heat exchanger used as an evaporator → the compressor. Thereby, the heat exchanger for the primary heat storage unit absorbs heat from the heat storage material, and the primary internal heat exchanger transmits heat to the secondary refrigerant via the secondary internal heat exchanger. Second heating operation mode,
Has three operation modes, the operation mode is switched by the primary side flow path switching means, and the operation is performed,
The secondary cycle is the primary cycle is the first cycle.
When the operation in the heating operation mode or the second heating operation mode is performed, by performing the operation in the inter-cycle heat exchange operation mode, the secondary-side internal heat exchanger receives the heat from the primary-side internal heat exchanger. By heating the room by the secondary-side indoor heat exchanger using the heated heat and operating the heat storage operation mode when the primary cycle is not operating, It is only necessary that the secondary-side heat storage unit heat exchanger heats the room received from the heat storage material by the secondary-side indoor heat exchanger.

[0086]

As is apparent from the above description,
The present invention according to claims 1 to 8, the secondary refrigerant thermal storage air-conditioning system capable of efficient operation, especially, even using a new refrigerant such as a hydrocarbon-based refrigerant or an ammonia-based refrigerant that does not affect global warming. Thus, it is possible to provide a secondary refrigerant heat storage air conditioning system capable of performing efficient operation. That is, by using a hydrocarbon-based refrigerant or an ammonia-based refrigerant as the primary refrigerant,
It is possible to provide a highly efficient secondary refrigerant thermal storage air-conditioning system that is less affected by leakage of a flammable or toxic refrigerant while using an environmentally friendly natural refrigerant.

The present invention according to claims 3 and 4 comprises a heat storage air-conditioning system provided with a four-way valve capable of performing both the cooling operation and the heating operation. A refrigerant heat storage air conditioning system can be provided.

Further, according to the present invention, by setting the "predetermined time zone" of the present invention to be nighttime, heat is stored at night, and during the daytime when power demand is high, the heat in the heat storage tank is stored. Air conditioning can be performed directly by using heat or by using the heat in the heat storage tank instead of outdoor air, so high efficiency, low electricity rates, and a reduction in power peaks can be achieved. A secondary refrigerant heat storage air conditioning system can be provided.

Further, according to the present invention, the clathrate is generated by using a hydrocarbon-based substance having 4 or less carbon atoms as a heat storage material, thereby using an environmentally friendly natural refrigerant. By using latent heat, it is possible to provide a secondary refrigerant heat storage air conditioning system having a large heat storage amount even though it is small.

Further, according to the present invention, a clathrate having a freezing point of 0 to 15 ° C. is generated by using propane and ethane alone or as a mixture as a heat storage material, thereby using an environmentally friendly natural refrigerant. It is possible to provide a secondary refrigerant heat storage air conditioning system having a small size and a large amount of heat storage by utilizing latent heat at a temperature optimal for cooling operation and using a single or mixture of propane and ethane as a heat storage material to have a freezing point of 0 to 20 ° C. To provide a small-sized secondary refrigerant thermal storage air-conditioning system that can use appropriate latent heat in both cooling operation and heating operation by using an environmentally friendly natural refrigerant by generating a clathrate of Can be.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a secondary refrigerant heat storage air conditioning system according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating flows of a primary refrigerant and a secondary refrigerant in a first operation pattern of the secondary refrigerant thermal storage air conditioning system according to the first embodiment of the present invention.

FIG. 3 is a Mollier diagram of a primary refrigerant in a first operation pattern of the secondary refrigerant thermal storage air conditioning system according to the first embodiment of the present invention.

FIG. 4 is a diagram showing flows of a primary refrigerant and a secondary refrigerant in a second operation pattern of the secondary refrigerant thermal storage air conditioning system according to the first embodiment of the present invention.

FIG. 5 is a diagram showing flows of a primary refrigerant and a secondary refrigerant in a third operation pattern of the secondary refrigerant thermal storage air conditioning system according to the first embodiment of the present invention.

FIG. 6 is a Mollier diagram of a primary refrigerant in a third operation pattern of the secondary refrigerant heat storage air conditioning system according to the first embodiment of the present invention.

FIG. 7 is a diagram showing flows of a primary refrigerant and a secondary refrigerant in a fourth operation pattern of the secondary refrigerant thermal storage air conditioning system according to the first embodiment of the present invention.

FIG. 8 is a Mollier diagram of a primary refrigerant in a fourth operation pattern of the secondary refrigerant thermal storage air conditioning system according to the first embodiment of the present invention.

FIG. 9 is a schematic configuration diagram showing a secondary refrigerant heat storage air conditioning system according to a second embodiment of the present invention.

FIG. 10 is a diagram showing flows of a primary refrigerant and a secondary refrigerant in a fifth operation pattern of a heating operation of the secondary refrigerant heat storage air conditioning system according to the second embodiment of the present invention.

FIG. 11 is a Mollier diagram of a primary refrigerant in a fifth operation pattern of a heating operation of the secondary refrigerant heat storage air conditioning system according to the second embodiment of the present invention.

FIG. 12 is a diagram showing flows of a primary refrigerant and a secondary refrigerant in a sixth operation pattern of a heating operation of the secondary refrigerant heat storage air conditioning system according to the second embodiment of the present invention.

FIG. 13 is a diagram illustrating flows of a primary refrigerant and a secondary refrigerant in a seventh operation pattern of a heating operation of the secondary refrigerant heat storage air conditioning system according to the second embodiment of the present invention.

FIG. 14 is a Mollier diagram of a primary refrigerant in a seventh operation pattern of a heating operation of the secondary refrigerant heat storage air conditioning system according to the second embodiment of the present invention.

FIG. 15 is a diagram showing flows of a primary refrigerant and a secondary refrigerant in an eighth operation pattern of a heating operation of the secondary refrigerant thermal storage air conditioning system according to the second embodiment of the present invention.

FIG. 16 is a Mollier diagram of a primary refrigerant in an eighth operation pattern of a heating operation of the secondary refrigerant heat storage air conditioning system according to the second embodiment of the present invention.

FIG. 17 is a schematic configuration diagram showing a conventional secondary refrigerant air conditioning system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Primary-side external heat exchanger 3 Primary-side heat storage part heat exchanger 4 Primary-side internal heat exchanger 5 First expansion valve 6 Second expansion valve 7 First three-way valve 8 Second Three-way valve 9 First four-way valve 10 Heat storage tank 11 Secondary-side heat storage unit heat exchanger 12 Secondary-side internal heat exchanger 13 Circulation pump 14 Secondary-side indoor heat exchanger 15 Third three-way valve 16 Four three-way valve 17 Second four-way valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 5/06 C09K 5/06 Z F24F 11/02 102 F24F 11/02 102B F25B 13/00 351 F25B 13 / 00 351 F28D 20/02 F28F 23/02 D F28F 23/02 F28D 20/00 C (72) Inventor Norioka Okaza 1006 Odoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yuji Yoshida Osaka 1006, Kadoma, Kamon, Fumonma-shi Matsushita Electric Industrial Co., Ltd. F term (reference) 3L054 BG04 BH07 3L060 AA03 CC01 CC08 DD07 EE01 EE41 3L092 AA02 BA17 BA21 BA23 BA26 EA18 EA20 FA22 FA34

Claims (8)

[Claims] 1. A compressor, a primary-side external heat exchanger, a primary-side heat storage unit heat exchanger, a primary-side internal heat exchanger, a throttling device, and a primary-side flow switching means, and a primary refrigerant is filled therein. Having a primary cycle, a circulation pump, a secondary-side indoor heat exchanger, a secondary-side heat storage unit heat exchanger, a secondary-side internal heat exchanger, and a secondary-side flow path switching unit, A secondary cycle in which a secondary refrigerant is sealed, and a heat storage material is sealed, and the heat storage material exchanges heat with the heat exchanger for the primary heat storage unit and the heat exchanger for the secondary heat storage unit. A heat storage unit that stores heat, wherein the primary-side internal heat exchanger and the secondary-side internal heat exchanger are arranged so as to be able to exchange heat, and the primary cycle includes the compression Heat exchanger for primary side used as a condenser → condenser → the throttling device → evaporator By the primary refrigerant circulating in the order of the used heat exchanger for the primary heat storage unit → the compressor, the external heat exchanger for the primary side emits heat to the outside, and for the primary heat storage unit. A cold storage operation mode in which a heat exchanger stores cold heat in the heat storage unit; the compressor → the primary external heat exchanger used as a condenser → the throttling device → the primary internal heat exchanger used as an evaporator → The primary refrigerant circulates in the order of the compressor, whereby the primary-side external heat exchanger emits heat to the outside, and the primary-side internal heat exchanger exchanges the secondary-side internal heat exchange. A first cooling operation mode for transmitting cold heat to the secondary refrigerant via a heat exchanger, the compressor → the heat exchanger for the primary heat storage unit used as a condenser → the throttling device → the primary interior used as an evaporator Heat exchanger → compression The primary refrigerant circulates in this order, whereby the heat exchanger for the primary heat storage unit releases heat to the heat storage material, and the heat exchanger for the primary internal heat exchanges the heat for the secondary internal heat. A second cooling operation mode for transmitting cold heat to the secondary refrigerant via a heat exchanger, wherein the operation mode is switched by the primary-side flow switching means to perform an operation; The side cycle is performed in the order of the secondary side internal heat exchanger → the secondary side indoor heat exchanger → the secondary side internal heat exchanger, By the circulation of the refrigerant, the secondary-side internal heat exchanger uses the cold heat received from the primary-side internal heat exchanger to cool the room by the secondary-side indoor heat exchanger. Exchange operation mode, heat exchanger for secondary side heat storage section → The secondary-side heat storage unit heat exchanger is circulated in the middle of the secondary-side heat storage unit heat exchanger → the secondary-side heat storage unit heat exchanger via the circulation pump in the order of the secondary-side heat storage unit heat exchanger. A heat storage use operation mode in which the heat exchanger cools down the room received by the heat storage material from the heat storage material by the secondary side indoor heat exchanger. The mode is switched, and the operation is performed. When the primary cycle performs the operation of the first cooling operation mode or the second cooling operation mode, the secondary cycle performs the operation of the inter-cycle heat exchange operation mode. A secondary refrigerant heat storage air conditioning system characterized by performing operation. 2. The throttle device according to claim 1, further comprising: a first throttle device disposed between the primary-side external heat exchanger and the primary-side internal heat exchanger; and a first throttle device and the primary side. And a second expansion device disposed between the internal heat exchangers, wherein one of the first and second expansion devices operates alone or both simultaneously, and the primary side The flow path switching means has a first three-way valve, a second three-way valve, and a first four-way valve, and the secondary flow path switching means has a third three-way valve, a fourth three-way valve, A three-way valve, wherein the first three-way valve selects and connects any two of the outlet side of the compressor, the primary-side external heat exchanger, and the first four-way valve Wherein the second three-way valve is one of the first throttle device, the second throttle device, and the heat exchanger for the primary-side heat storage unit. The first four-way valve is connected to either the inlet side of the compressor or the first three-way valve and the heat exchanger for the primary heat storage unit or the inside of the primary side. And the third three-way valve is connected to the secondary heat storage unit heat exchanger, the secondary indoor heat exchanger, and the second heat exchanger. Internal heat exchanger
And the fourth three-way valve is connected to the secondary-side heat storage unit heat exchanger, the secondary-side indoor heat exchanger, and the secondary-side interior. Heat exchanger,
And the circulating pump is connected to a path connecting the third three-way valve and the secondary-side indoor heat exchanger, or the fourth pump.
2. The secondary refrigerant thermal storage air conditioning system according to claim 1, wherein the secondary refrigerant thermal storage air conditioning system is disposed on a path connecting between the three-way valve and the secondary-side indoor heat exchanger. 3. The primary cycle includes, in addition to the three operation modes, the compressor → the heat exchanger for the primary heat storage section used as a condenser → the throttle device → the primary side used as an evaporator. By circulating the primary refrigerant in the order of the external heat exchanger → the compressor, the primary external heat exchanger absorbs heat from the outside, and the primary heat storage unit heat exchanger absorbs the heat. A heat storage operation mode for storing heat in the section, the compressor → the primary internal heat exchanger used as a condenser → the throttling device → the primary external heat exchanger used as an evaporator → the compressor, By circulating the primary refrigerant in the order, the primary-side external heat exchanger absorbs heat from the outside, and the primary-side internal heat exchanger passes through the secondary-side internal heat exchanger. Transfers heat to secondary refrigerant 1 heating operation mode, the compressor → the primary side internal heat exchanger used as a condenser → the expansion device → the primary side heat storage unit heat exchanger used as an evaporator → the compressor in this order By circulating the primary refrigerant, the heat exchanger for the primary heat storage unit absorbs heat from the heat storage material, and the heat exchanger for the primary side internal heat exchanger is connected to the heat exchanger for the secondary side via the heat exchanger for secondary side internal heat. A second heating operation mode for transmitting heat to the secondary refrigerant, and has three operation modes, wherein the operation mode is switched by the primary-side flow switching means to perform an operation, and the secondary cycle includes: When the side cycle performs the operation of the first heating operation mode or the second heating operation mode, by performing the operation of the inter-cycle heat exchange operation mode, the secondary-side internal heat exchanger is connected to the primary side. Using the heat received from the external heat exchanger, the secondary-side indoor heat exchanger heats the room, and when the primary cycle is not operating, operates the heat storage operation mode. By doing
2. The secondary refrigerant heat storage air conditioning system according to claim 1, wherein the secondary-side heat storage unit heat exchanger heats the room received from the heat storage material by the secondary-side indoor heat exchanger. 3. . 4. The throttle device according to claim 1, further comprising: a first throttle device disposed between the primary-side external heat exchanger and the primary-side internal heat exchanger; and a first throttle device and the primary side. And a second expansion device disposed between the internal heat exchangers, wherein one of the first and second expansion devices operates alone or both simultaneously, and the primary side The flow path switching means has a first three-way valve, a second three-way valve, a first four-way valve, and a second four-way valve. It has a three-way valve and a fourth three-way valve, and the first three-way valve is any one of the second four-way valve, the primary-side external heat exchanger, and the first four-way valve. And the second three-way valve is connected to the first throttling device, the second throttling device, and heat exchange for the primary heat storage unit. , Which selectively connects one of two-way of the first four-way valve, the second four-way valve or the first
One of the three-way valve and one of the primary-side heat storage unit heat exchanger or the primary-side internal heat exchanger is selected and connected, respectively, and the second four-way valve is the compression unit. Any one of the inlet side of the compressor or the outlet side of the compressor and one of the first four-way valve and the first three-way valve is selected and connected, respectively, and the third three-way valve is , The secondary-side heat storage unit heat exchanger, the secondary-side indoor heat exchanger, the secondary-side internal heat exchanger,
And the fourth three-way valve is connected to the secondary-side heat storage unit heat exchanger, the secondary-side indoor heat exchanger, and the secondary-side interior. Heat exchanger,
And the circulating pump is connected to a path connecting the third three-way valve and the secondary-side indoor heat exchanger or the fourth pump. 4. A three-way valve and a secondary-side indoor heat exchanger are disposed on a path connecting between the three-way valve and the secondary-side indoor heat exchanger.
The secondary refrigerant thermal storage air-conditioning system according to 4. 5. When a cooling and heating operation is not being performed, and in a predetermined time zone, the primary cycle performs an operation in the cold storage operation mode or the temperature storage operation mode. The secondary cycle has stopped operation, and when performing cooling or heating operation, the difference between the temperature of the heat storage material and the outside air temperature is equal to or more than a predetermined value in a time zone other than the predetermined time zone. In the case, the secondary cycle performs the operation of the heat storage utilizing operation mode, and at this time, the primary cycle has stopped the operation, and when performing the cooling or heating operation, the predetermined time period. In a time zone other than, when the difference between the temperature of the heat storage material and the outside air temperature is smaller than the predetermined value and larger than another predetermined value, or, in the predetermined time zone, the temperature of the heat storage material and Before the difference with the outside air temperature If another larger than a predetermined value, the primary cycle performs the operation of the second cooling operation mode or the second heating operation mode, in which,
The secondary cycle performs an operation in the inter-cycle heat exchange operation mode.When performing a cooling or heating operation, the difference between the temperature of the heat storage material and the outside air temperature is equal to or less than the another predetermined value. The primary cycle is the first cooling operation mode or the first cooling operation mode.
The secondary refrigerant thermal storage air conditioning according to any one of claims 1 to 4, wherein the operation in the heating operation mode is performed, and the secondary cycle performs the operation in the inter-cycle heat exchange operation mode. system. 6. The refrigerant according to claim 1, wherein the primary refrigerant is a hydrocarbon-based refrigerant or an ammonia-based refrigerant.
The secondary refrigerant thermal storage air conditioning system according to any one of claims 1 to 5. 7. The heat storage material includes a simple substance or a mixture of hydrocarbon-based substances having 4 or less carbon atoms and water, and performs latent heat storage by generating a clathrate. The secondary refrigerant thermal storage air conditioning system according to any one of claims 1 to 6, wherein: 8. The heat storage material contains propane and / or ethane alone or as a mixture, and water. When the heat storage material is exclusively used for cooling, the solidification point is substantially 0 ° C. to 15 ° C. It generates a clathrate in the range of ° C, and when used for both cooling and heating, its freezing point is substantially 0 ° C.
The secondary refrigerant thermal storage air-conditioning air-conditioning system according to claim 7, wherein a clathrate in a range of ~ 20 ° C is generated.