JPH0968330A - Heat pump type air conditioning system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accomplish an operation without exchanging heat storage material all through summer and winter seasons by a method wherein an accumulation means is provided in parallel with an outdoor unit of a heat pump circuit to store power during an off-peak period as heat source for air conditioning and a heat storage material is arranged in the accumulation means to develop a latent heat action due to a phase change within a specified temperature range. SOLUTION: In the summer season (cooling) operation, a gaseous medium discharged from a compressor 10 radiates heat with an outdoor unit 13 to be liquefied and supplied to a room unit 14 via an expansion valve to cool a zone to be air conditioned by an endothermic effect (cooling) effect obtained with evaporation here. During the cold heat storage period, the medium liquefied by the outdoor unit 13 is sent to a heat storage means 12 via the expansion valve to store a cold heat capacity. The cold heat storage operation is implemented using midnight power. The cold heat stored is used to make up for condensing action during the cooling operation. In this case, the heat storage material arranged in the heat storage means 12 employs a substance which causes a phase change between a solid phase and a liquid phase in a temperature range of about 5-35 deg.C and delivers a latent heat action.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioning system and method for a building (hereinafter, also referred to as a building). More specifically, the present invention comprises three elements of the heat pump circuit, a heat medium compressor, a condenser, and four elements if an expansion valve is added next, but the expansion valve is omitted here. ) In addition to the evaporator, the present invention relates to a heat pump type air conditioning system and method in which heat storage means for storing heat when the air conditioning load increases is arranged in a specific mode by utilizing electric power at the time of off-peak.

[0002]

2. Description of the Related Art Conventionally, in heat pump type air conditioning systems, in order to solve the problems of improvement of cooling capacity in summer and tight power demand during summer daytime, the cooling capacity ( Potential) is being accumulated. That is, a conventional technique of this type will be described with reference to FIG. 5. In FIG. 5A, 100 is a rooftop of a building or a plane showing the entire building. 102 is an outdoor unit of a heat pump type air conditioning system. Reference numeral 104 denotes an ice maker (ice heat accumulator) that uses nighttime electric power to freeze water to accumulate cooling capacity. 10
6 and 108 are pipes between the outdoor unit and the ice maker. 110, 11
2 is an indoor unit (114a,
Piping to 114b, 114c ,. 114a, 1
14b and 114c are indoor units used for blowing out conditioned air. 110a, 110b; 110b, 112c; 11
0c and 112c are branch pipes from the pipes 110 and 112 to the indoor unit. The numbering will be further explained with reference to FIG. 5B.
02a is a fan equipped in the outdoor unit 102. 102b is a heat medium (refrigerant) compressor. 102c is a heat exchanger. 102d is a perforated plate for ventilation. 104a is a heat exchanger of the ice maker 104. 104b is water in the ice maker. 115a is an indoor unit 114
Evaporator of refrigerant (heat exchanger) equipped in a. Reference numeral 116a is an air blowing fan.

In the above system, the indoor units 114a, 114b, 114c are used at the time of ice making using night power.
The pipes 110 and 112 leading to the etc. are closed, a refrigeration cycle is configured between the outdoor unit 102 and the ice maker 104, and the refrigerant is circulated in the direction indicated by the dotted arrow in FIG. 5B to cool the water 104b in the ice maker. To do. The problem here is that in order to use the latent heat of freezing and thawing water as cold heat capacity, it is necessary to freeze water, but in order to realize freezing of water,
Refrigeration cycle evaporator (heat exchanger 104 of ice maker 104)
greatly lowering the evaporation temperature of a), ie about -10
Need to lower to ℃. However, under such operating conditions, the coefficient of performance (COP) of the refrigerator (outdoor unit + ice maker) becomes poor, and under these conditions, it is necessary to operate the refrigerator under operating conditions different from those during the daytime cooling operation. Therefore, there is a problem that a complicated load is applied to the operation of the refrigerator. Then, without cooling the water, a system that cools this water at night power, for example, around 5 ° C is conceivable. However, using cooling water around 5 ° C means utilizing the sensible heat of the water. , Harvest (cold)
The heat method does not utilize the large latent heat obtained during the solid / liquid phase change of water. Where
What should be noted about the above-mentioned conventional technology is that the outdoor unit 102
And ice machine (ice heat storage) and indoor units 114a, 114b, 1
14c, ... are connected in series.

[0004]

SUMMARY OF THE INVENTION In the heat pump circuit of the present invention, a heat medium compressor is connected to an outdoor unit (which serves as a condenser during the cooling operation in the summer and serves as an evaporator during the heating operation in the winter). In the loop that returns to the indoor unit (this becomes the evaporator during the cooling operation in summer and the condenser during the heating operation in winter) and then returns to the compressor, the heat is stored in parallel with the outdoor unit with respect to the compressor. An intermediate circuit including means is additionally provided. The heat storage means uses the power during off-peak hours,
The purpose is to operate the heat pump circuit in a loop of the compressor, the outdoor unit, and the heat storage means to store hot or cold heat. That is, in the case of warm heat accumulation, the heat storage means becomes a condenser and the outdoor unit becomes an evaporator, and in the case of cold heat accumulation, the outdoor unit becomes a condenser and the heat storage means becomes an evaporator.

A heat storage agent which is another feature of the present invention will be described. For the purpose of storing cold heat and warm heat, for example, a heat storage agent for cold heat having a phase change temperature of 0 to 5 ° C. (ie, phase change other than water). It is possible to use the (material) during the cooling operation in summer and to use the heat storage agent having a phase change temperature of around 40 ° C. during the heating operation in winter. In this case, the system is changed from the cooling operation to the heating operation. When changing it, it is necessary to replace the heat storage agent. In the present invention, in terms of utilization of sensible heat, even if it becomes disadvantageous due to a decrease in temperature difference, through the cooling operation in the summer and the heating operation in the winter, the heat storage agent is not exchanged, and one year passes through, and the heat storage agent is passed through. By utilizing the latent heat associated with the phase change of (3), it is intended to cope with the change of the thermal energy load of the air conditioning system through the cooling and heating operations.

That is, the temperature of the heat storage tank included in the heat storage means is an intermediate temperature between two temperatures, which are 0 to 5 ° C. during the cooling operation in summer and about 40 ° C. during the heating operation in winter. That is, the temperature range is about 5 to 35 ° C., preferably about 7 to
It is a substance that provides a latent heat effect by causing a solid / liquid phase change between 20 ° C, more preferably between about 10 ° C and 15 ° C. When used as a heat storage and heating capacity), it has the advantage that the temperature of the heat storage tank is not changed and the heat storage agent is not replaced throughout the year. The above-mentioned conventional ice heat storage was assumed to be installed on the roof of the building, but when the scale of the air conditioning system increases, the heat storage tank may be installed in the basement of the building, but in that case, the annual average of the basement is averaged. It is desirable to select the heat storage agent so that the temperature of the phase change of the heat storage agent substantially matches the temperature. More generally speaking, considering the temperature environment of the place where the heat storage tank is installed,
It is desirable to investigate the annual average temperature of the place in advance and adjust the phase change temperature of the heat storage agent (material) to a temperature that is approximately equal to the annual average temperature (± 5 ° C).

The latent heat storage system of the present invention (1) can reduce the capacity as a refrigerator by about 20% during the cooling operation in summer, as compared with the conventional system without heat storage. (2)
During winter heating operation (generally, the maximum load is smaller in winter than in summer), compared to conventional systems without heat storage,
The capacity as a refrigerator is reduced by about 20%. (3) The heat storage means of the present invention can reduce the power consumption by about 40% as compared with the conventional ice heat storage system. (4) Since the heat storage means are arranged in parallel, the heat radiation amount can be freely adjusted by adjusting the circulation ratio of the heat medium (refrigerant). Therefore, it is possible to cope with a large load change.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Providing a latent heat effect by a solid / liquid phase change ("providing a latent heat effect" means both absorbing and releasing a latent heat quantity). As a substance (Phase Change Material, PCM), petroleum paraffin wax [n-tetradecane (melting point: 5.5
C.), n-pentadecane (melting point: 10.0 ° C.), n-hexadecane (melting point: 18.1 ° C.), n-heptadecane (melting point: 22.5 ° C.), n-octadecane (melting point: 2)
8.0 ° C.), n-nonadecane (melting point: 32 ° C.), n-eicosane (melting point: 36.4 ° C.)], higher fatty acid-caprylic acid (melting point: 16.7 ° C.), pelargonic acid (melting point: 1
2.5 ° C), capric acid (melting point: 31.6 ° C), undecanoic acid (melting point: 29.3 ° C)], higher fatty acid ester [methyl myristate (melting point: 18.5 ° C), methyl pentadecanoate (melting point) : 18.5 ° C), methyl palmitate (melting point: 30.6 ° C)], higher fatty alcohol-decanol-1 (melting point: 6.9 ° C), undecanol-1
(Melting point: 15.9 ° C.), dodecanol-1 (melting point: 2
4.0 ° C.), tridecanol-1 (melting point: 30.6
℃)] For other inorganic compounds, sodium sulphate (sodium sul
hydrate based on fate), salt hydrate mixed system [sodium sulfate 10 hydrate / sodium chloride / ammonia chloride (melting point: 13 ° C.), sodium sulfate 10 hydrate (melting point: 32.2 ° C.)] You can

Of these, petroleum paraffin wax is produced by dewaxing treatment in the lubricating oil refining process, and is easily available as a commercial product. Further, in the present invention, the heat storage substance that undergoes a phase change does not need to be a single substance whose phase change temperature is exactly constant at, for example, 13 ° C., but is between 10 and 15 ° C., for example. It may have a so-called temperature range. Therefore, it is easy to prepare a heat storage agent from petroleum wax.

The paraffin heat storage agent and the inorganic salt heat storage agent may be used alone or in combination. For example,
When the paraffin is directly or once impregnated in the acrylic oil-absorbing resin and then dispersed in water, an inorganic salt heat storage agent (which may be used in combination with another inorganic thickener) is dispersed in water as a dispersion medium, The heat storage effect of both paraffin and inorganic salt can be utilized. However, in such a case, a heat storage agent (Thermal Storage Composition prepared in a form that can be arranged in the heat storage tank is referred to as a heat storage material (Thermal Storage Package) in the present invention in a form of accommodating the heat storage agent in a container. ] Will need to be used.

In order to disperse the acryl oil absorbing resin directly in the heat accumulating tank without using a container for accommodating the heat accumulating agent, for example, the acrylic oil absorbing resin is impregnated with paraffin and the hydrophilic resin is adhered to the outer periphery of the particles with an adhesive. Take the means of combining (and thus
In this case, only the paraffin heat storage agent is used.) Hydrophilicity is imparted to the outer periphery of the particles and dispersed in the heat storage water tank. In this case, since the container that stores the heat storage agent is not used, the heat storage agent serves as the heat storage material. Therefore, in this case, since it is a heat storage material that does not use a container, there is also a method of using it so that it remains in the heat storage tank while it is immersed in water, but the flow of water to the heat exchanger connected to the heat storage tank It is also possible to entrain a heat storage material and cause it to flow together with water as a heat carrier. Regarding the heat storage agent and the heat storage means related to the above, Japanese Patent Laid-Open No. 6-1
16550 and Japanese Patent Application No. 6-274206 can be referred to.

An example of the heat storage tank when the heat storage tank is installed on the roof of the building as in the case of FIG. 5 to carry out the present invention (in the case of replacing the ice maker 104 of FIG. 5) will be described with reference to FIG. . Reference numeral 50 in FIG. 6A is a cylindrical storage cylinder filled with the heat storage agent 52 (shown in an elevation view including a partial cross section). In FIG. 6B, 60 is the storage cylinder 5.
A closed tank (shown in cross-section) in which a large number of 0s are arranged vertically. 62 and 64 are perforated plates, and the storage cylinder is placed on the lower perforated plate 62. Reference numerals 66a, 66b; 68a, 68b are openings for vertically circulating the heat medium (refrigerant) in the tank.

Other machines, equipment and the like that can be used in the system of the present invention will be briefly described. As a compressor, a conventional reciprocating type, rotary type, scroll type, screw type or turbo type compressor can be used. A conventional plate fin coil type or shell and tube type heat exchanger can be adopted as the heat exchanger used as the condenser or the evaporator, but recently, the same heat exchanger has been used both as the evaporator and as the condenser. What can be done is commercially available, and this dual heat exchanger is convenient. Therefore, in the drawings described later, for simplification, they are simply shown as an outdoor unit and an indoor unit, but as can be understood from the above description, the substance includes a plurality of devices and machines. A conventional expansion valve can also be used in the present invention.

[0014]

The present invention will be described with reference to the following examples. Figure 1,
2. In FIG. 2, the summer operation diagram of FIG. 1 (which may be called cooling operation) is composed of the partial diagrams of 1-1, 1-2 and 1-3, and the winter operation diagram (heating operation) of FIG. It may also be said that) consists of Figures 2-1 and 2-2 and 2-3. Commonly, reference numeral 10 is a compressor, 11 is a four-way valve (2-way switching valve),
Reference numeral 12 (indicates a coil) is heat storage means, 13 is an outdoor unit, and 14
Indicates an indoor unit, and 15 indicates an area to be air-conditioned in the building.

In the above description, the outdoor unit (13) and the indoor unit (14) are devices for causing a phase change of the heat medium in the heat pump circuit, that is, an evaporator (from the liquid phase to the gas phase, the medium absorbs heat, so that the cooling effect is obtained. Heat) or the heat of the condenser (from the gas phase to the liquid phase, the medium radiates heat to provide a heating effect) and air (indoor unit air in the air conditioning target area, outdoor unit air not in the air conditioning target area) It includes a switching device. The air-conditioning air blowing device disposed in the building may be the indoor unit itself, or may be omitted from the drawing because it is a device that branches further from the indoor unit shown in the figure and is connected later.

Further, in FIG. 1 and FIG.
-2 and -3 correspond to each other, but Fig. 1-1 is normal (state that is operated in the cooling cycle regardless of the heat storage means), and Fig. 1-2 is cold heat storage (where cold heat is stored in the heat storage means). 1), and FIGS. 1 to 3 show the state of radiated heat (the state in which cold heat is taken out from the heat storage means). Similarly, FIG. 2A shows a normal state (a heating operation is performed regardless of the heat storage means).
-2 is heat storage heat (state where heat is stored in the heat storage means),
2 to 3 show the state of heat release (a state where heat is taken out from the heat storage means). In each figure, the thick line indicates the line in operation, the thin line indicates the resting part that is not in operation, and the arrow indicates the flow direction of the heat medium.

The summer (cooling) operation of FIG. 1 will be described. In FIG. 1-1 (normal), the heat medium (medium) does not pass through the heat storage means. The outdoor unit located after the compressor radiates heat to liquefy the gaseous medium and, though not shown, enters the expansion valve after liquefaction. Next, when gasifying in the indoor unit, an endothermic (cooling) effect is given to the air conditioning target area. Figure 1-2 (cold heat storage) shows the liquefied medium in the outdoor unit,
It is in a state where it is sent to the heat storage means through the expansion valve to store the cold heat capacity, which is carried out by nighttime midnight power in summer.

FIGS. 1 to 3 (cooling heat) show the feature of the present invention. In the same figure, in the front of the outdoor unit after the compressor, the flow path of the medium is divided into two, one is the heat storage means. The gas medium is liquefied by going into the room, and the gas medium is liquefied, that is, the heat storage means operates in parallel with the outdoor unit to assist the operation of the condenser. The heat storage tank is a closed tank shown in Fig. 6, and it may be installed on the roof of the building, but in a large system, it is usually installed in the basement of the building, and the temperature outside the outdoor unit is high. When the temperature difference between the inside and outside of the building is large, the heat storage tank installed in this basement is very effective. This state is selected immediately after the start of the cooling operation or when the cooling load is large, such as at the peak of cooling in the summer.

To explain the winter (heating) operation of FIG. 2, the flow of the medium in the four-way valve 11 is changed from that of FIG. In Figure 2-1 (normal), the heat medium (medium) does not go through the heat storage tank. Then, the indoor unit located after the compressor radiates and liquefies the gaseous medium, and the heat radiation (heating) effect at this time is given to the air conditioning target area. FIG. 2-2 (heat storage heat) shows a state in which the medium pressurized by the compressor is sent to the heat storage means to store the heat capacity, which is carried out by nighttime midnight power in winter.

2 to 3 (heat release heat) show the feature of the present invention. In the figure, the medium from the compressor enters the indoor unit in the form of gas and is liquefied by giving a heating effect. Next, although not shown in the figure, the flow enters the expansion valve, the flow path is divided into two in front of the heat storage means, one enters the heat storage means and is heated in the heat storage tank,
That is, the heat storage means operates in parallel with the outdoor unit to assist the operation of the evaporator. When the outdoor temperature of the outdoor unit is low and the temperature difference between the inside and outside of the building is large, the effect of installing the heat storage means underground is great. This effect is selected when the heating load is large, such as immediately after the start of heating operation.

As described above, since the outdoor unit and the heat storage means can be operated in parallel during peak operation of the air conditioning load in summer and winter, the design capacity of the air conditioning equipment can be reduced. In the above description, the cold storage heat of the heat storage tank serving as the cold heat source during the summer (cooling) operation is the same as that of the heat storage tank serving as the warm heat source during the winter (heating) operation. That is, it is a heat storage agent capable of providing the above-mentioned latent heat action of solid phase / liquid phase change, and is an enhanced heat storage tank so that the temperature of the heat storage tank does not need to be changed throughout the year. The words were changed because they act as a cold heat source during the summer (cooling) operation and as a warm heat source during the winter (heating) operation, so they were used for convenience of explanation. This "same thing" is a feature of the present invention, as can be seen from the above description.

Next, referring to FIG. 3 (FIGS. 3A and 3B),
A specific example of the heat pump circuit of the present invention shown in FIGS. Incidentally, in FIG. 3, FIG. 5 and FIG.
The same reference numerals are used for the same components as those shown in, and the pump, control valve, check valve, expansion valve, and other obvious components in the pipe may be omitted.

FIG. 3A shows a heat storage means installed on the roof of a building (indicated by 100), which is the closed tank shown in FIG. 6 and stores the heat storage agent in a container (indicated by 50). The heat medium (which may be called a refrigerant) does not directly enter the heat storage tank (shown by 60) but exchanges heat with water in the heat exchanger (shown by 120), and This is an example in which the heat carrier enters the heat storage tank 60 as. In the figure, the devices not shown in FIGS. 5 and 6 are the heat exchanger 120 described above, the pipe 124 between the heat exchanger 120 and the heat storage tank,
126, pump 122, four-way valve 10 in the outdoor unit 102
2e, piping 12 between the outdoor unit 102 and the heat exchanger 120
8 and 130, and pipes 132 and 134 between the outdoor unit 102 and the indoor unit 114.

In FIG. 3B, a heat storage means is installed in the basement of the building (the ground plane is indicated by GL and the basement is indicated by 99), which is an open-type tank shown in FIG. 4 and the heat storage agent is left in the tank. In this example, the heat medium is not allowed to directly exchange heat with the heat storage agent as in the case of FIG. 3A but is exchanged with water as an intermediate medium. The new equipment is an underground tank 1a indicated by 1a, a water inflow pipe 5a, and an outflow pipe 4 into the tank.
a.

As can be seen from the description of FIGS. 1 and 2, FIG.
And in the system of FIG. 3B, a four-way valve 102e is introduced,
By modifying the associated piping 102f, the flow of the heat medium can be controlled in the same manner as in FIGS.

Next, referring to FIG. 4 (as described above, FIG. 4 is related to FIG. 3), FIG. 4 is a plan view of a heat storage tank divided into 16 communicable sections. In the figure, 1a is the whole tank, 5a is an inflow pipe to the tank, and 4a is an outflow pipe from the tank. The tank 1a is divided into 16 small heat storage tanks (1st to 16th tanks) as described above, and a communication pipe is provided between the respective small tanks so that a running water path can be formed diagonally. 11a is provided. That is, water is the inflow pipe 5a.
In the first tank (1t), the water (an outline flow of water is shown by an arrow) advances to the second tank (2t), the third tank (3t), and the fifth tank.
Turned in the tank (5t) to reach the 6th tank (6t),
In the tank (8t), the direction is changed again to reach the 11th tank (11t), and the direction is changed again to return to the 16th tank including the outflow pipe 4a.

The heat storage material (agent) is the first tank (1t) that first receives the water that is affected by the temperature of the tank due to heat exchange and returns, and then the second tank (2t) and the third tank whose temperature changes.
The heat storage material is placed in the tank (3t) and the fourth tank (4t) in that order as needed, and the heat storage material is placed in a immersed state in the tank. Furthermore, how the heat storage material is dipped and maintained in the tank depends on the form of the heat storage material. For example, if the heat storage material is in a container, a shelf that holds many containers Tiered wagons are usually used. If the heat storage material is in the form of cohesive particles that collect by itself, it is left alone in the tank or floated. However, if the heat storage material is in the form of particles that does not have the property of collecting heat, the heat storage material will flow through the outflow pipe 5a. It is also possible to entrain it in the flow of water (heat carrier) between the heat exchanger and the heat exchanger.

[0028]

[Brief description of drawings]

FIG. 1 is a diagram illustrating a heat pump circuit during a cooling operation in summer.

FIG. 2 is a diagram illustrating a heat pump circuit during a heating operation in winter.

FIG. 3 is an explanatory diagram of a specific example of the heat pump type air conditioning system shown in FIGS. 1 and 2.

FIG. 4 is a plan view of a heat storage tank including an open tank.

FIG. 5 is a simplified perspective view of a conventional heat pump type air conditioner utilizing ice heat storage.

FIG. 6 is a sectional elevation view of a heat storage tank including a closed tank.

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[Procedure amendment]

[Submission date] July 1, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a diagram illustrating a heat pump circuit during a cooling operation in summer.

FIG. 2 is a diagram illustrating a heat pump circuit during a heating operation in winter.

FIG. 3 is a simplified cross-sectional view of a specific example (A) of the heat pump type air conditioning system shown in FIGS. 1 and 2.

FIG. 4 is a simplified cross-sectional view of a specific example (B) of the heat pump type air conditioning system shown in FIGS. 1 and 2.

FIG. 5 is a plan view of a heat storage tank including an open tank.

6A and 6B are explanatory views of a conventional heat pump type air conditioner utilizing ice heat storage, in which FIG. 6A is a perspective view and FIG. 6B is a mechanism explanatory view.

FIG. 7 is a simplified cross-sectional view of a heat storage agent container (A) and a heat storage tank (B) including a closed tank using the heat storage agent container (A).

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

[Fig. 1]

FIG. 2

[Fig. 3]

[Fig. 4]

[Figure 5]

[Figure 6]

[Fig. 7]

[Procedure amendment]

[Submission date] July 24, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a diagram illustrating a heat pump circuit during a cooling operation in summer.

FIG. 2 is a diagram illustrating a heat pump circuit during a heating operation in winter.

FIG. 3 is a simplified cross-sectional view of a specific example (A) of the heat pump type air conditioning system shown in FIGS. 1 and 2.

FIG. 4 is a simplified cross-sectional view of a specific example (B) of the heat pump type air conditioning system shown in FIGS. 1 and 2.

FIG. 5 is a plan view of a heat storage tank including an open tank.

6A and 6B are explanatory views of a conventional heat pump type air conditioner utilizing ice heat storage, in which FIG. 6A is a perspective view and FIG. 6B is a mechanism explanatory view.

FIG. 7 is a simplified cross-sectional view of a heat storage agent container (A) and a heat storage tank (B) including a closed tank using the heat storage agent container (A).

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

[Fig. 1]

FIG. 2

[Figure 5]

[Fig. 3]

[Fig. 4]

[Figure 6]

[Fig. 7]

Claims (4)

[Claims] 1. A heat storage means for storing electric power during off-peak hours as a heat source for air conditioning is provided in parallel with an outdoor unit of a heat pump circuit, and the heat storage means has a latent heat action by a phase change within a temperature range of about 5 to 35 ° C. A heat pump type air conditioning system in which a heat storage material capable of providing heat is arranged without change throughout summer and winter. 2. A storage means for storing electric power during off-peak hours as a heat source for air conditioning is provided in parallel with an outdoor unit of a heat pump circuit, and the heat storage means has a latent heat action by a phase change within a temperature range of about 5 to 35 ° C. A heat pump type air-conditioning method, in which a heat storage material capable of providing heat is arranged without change throughout summer and winter. 3. The heat storage means according to claim 1 or 2, wherein the heat storage means includes a heat storage tank and a heat exchanger, and the heat storage material is arranged so as to be immersed in water in the heat storage tank. 4. The heat storage agent according to claim 1 or 2, wherein the heat storage agent contained in the heat storage material is petroleum paraffin alone which changes phase in a required temperature range or an inorganic salt which changes phase in a required temperature range with petroleum paraffin. Must be used in combination.