JPH024169A - Regeneration type airconditioner - Google Patents

Abstract

PURPOSE:To improve an application efficiency of stored cooling heat and hence reduce a total electric service power by switching the supply of cooling water to a condenser between a cooling device and a regeneration tank as required, overcooling refrigerant condensed by a condenser by stored cooling heat in a heat storage tank and controlling an application ratio of cooling water to said condenser based on said cooling device and regeneration tank, responding with operation conditions so that it may be variable. CONSTITUTION:During ordinary cooling operation, a first circulation mechanism 31 is turned in operating state. Refrigerant is condensed in a condenser 2 due to the heat exchange with cooling water cooled by a cooling device 15, and evaporated by an evaporator, thereby cooling the interior of a room. When it is necessary to increase the condensation capacity of the refrigerant in the condenser 2, a switch over means 33 turns a second circulation mechanism 32 in operating state so that the pre-stored and cool-heated water in a heat storage tank 9 may circulate to the condenser 2. When the condensation capacity is also called for, an overcooling means 34 is adapted to overcool the cooling medium condensed in the condenser 2. Furthermore, a control means 35 controls the supply ratio of cooling water to the condenser 2 by the first circulation mechanism and the second circulation mechanism 32 so that it may be variable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a regenerative air conditioner equipped with a water-cooled condenser and a heat storage tank, and particularly relates to measures for improving the utilization efficiency of cold heat stored in the heat storage tank. .

(Prior Art) Conventionally, as disclosed in, for example, Japanese Utility Model Application Publication No. 55-94661, in an air conditioner equipped with a heat storage tank, two heat exchange coils are arranged in the heat storage tank to reduce the power consumption during nighttime, etc. When it is inexpensive, one heat exchange coil can be used as an evaporator to impart cold heat to the heat storage medium in the heat storage tank and store cold heat, and during cooling operation, the refrigerant that has been liquefied and condensed in the condenser is transferred to the other coil. It is known that the cooling capacity of the indoor heat exchanger is increased by further supercooling, thereby increasing the total operating efficiency and reducing power consumption.

(Problem to be Solved by the Invention) However, when performing cold storage heat recovery cooling operation using the above conventional system, the cold heat stored in advance in the heat storage tank is only used for supercooling the refrigerant. , there are the following problems.

In other words, on days when the cooling load is low, all the stored cold heat in the heat storage tank is not used up, and the next additional heat storage is carried out with the stored cold heat left behind, resulting in the stored cold heat being stored for a long time. Therefore, the heat loss during that time is large. In addition, a high cold storage heat effect can be obtained by using so-called latent heat that freezes inside the heat storage tank, but in that case, with the conventional type described above, ice remains at the end of the cooling operation, so it is not possible to If an attempt is made to make ice again by cold storage heat operation in a heat storage tank in which uniformly remaining ice exists, there is a risk that unreasonable stress will be applied to the heat storage tank, heat exchange coil, etc., resulting in damage.

The present invention has been made in view of the above, and its first object is to utilize the stored cold heat in the heat storage tank as a condensation source in a water-cooled condenser, thereby reducing the amount of stored cold heat. The aim is to increase usage efficiency and reduce total power consumption.

The second purpose is to expand the usage of cold storage heat and further reduce the total power consumption by using the stored cold heat not only as a condensation source but also as a subcooling source for condensed refrigerant. .

The third purpose is to use the stored cold heat in the heat storage tank in a condenser by adjusting the utilization rate appropriately, thereby making more careful use of the stored cold heat and further reducing the total power consumption. There is a particular thing.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention includes a compressor (1), a water-cooled condenser (2), a pressure reducing mechanism (4) and A main refrigerant circuit (8) formed by sequentially connecting an evaporator (5), a heat storage tank (9) containing water as a heat storage medium, and heat exchange between the water in the heat storage tank (9) and the refrigerant. The present invention is based on a heat storage type air conditioner equipped with a heat exchange coil (10).

and a cooling device (15) for cooling the cooling water of the condenser (2), and the cooling device (15) and the condenser (2).
and a first circulation mechanism (31) that connects the cooling water so that the cooling water can be circulated.
The heat storage tank (9) and the condenser (2) are combined into a heat storage tank (9).
a second circulation mechanism (32) connected to enable circulation of water within;
A switching means (33) is provided for selectively switching the supply of cooling water to the condenser (2) by the first circulation mechanism (31) and the second circulation mechanism (32).

In addition, as shown in FIG. 3, the second solution is based on a regenerative air conditioner similar to the first solution,
A cooling device for cooling the cooling water of the condenser (2) (
15), a first circulation mechanism (31) that connects the cooling device (15) and the condenser (2) so that cooling water can be circulated, and a heat storage tank (9) and the condenser (2) that connect the heat storage tank (9) and the condenser (2) to each other for heat storage. a second circulation mechanism (32) connected to enable circulation of water in the tank (9);
a switching means (33) for selectively switching the supply of cooling water to the condenser (2) by the circulation mechanism (31) and the second circulation mechanism (32); and a refrigerant condensed in the condenser (2). A supercooling mechanism (34) is provided for supercooling the water in the heat storage tank (9).

Furthermore, as shown in FIG. 8, the third solution is based on a regenerative air conditioner similar to the first solution, and has a cooling system for cooling the cooling water of the condenser (2). A device (15), a first circulation mechanism (31) that connects the cooling device (15) and the condenser (2) so that cooling water can be circulated, and the heat storage tank (9) and the condenser (2). cooling to the condenser (2) by the second circulation mechanism (32) that connects the water in the heat storage tank (9) so that the water can be circulated, and the first circulation mechanism (31) and the second circulation mechanism (32). A control means (35) for variably adjusting the water supply ratio is provided.

(Function) With the above configuration, in the invention of claim (1), during normal cooling operation, the first circulation mechanism (31) is in the operating state,
In the condenser (2), the refrigerant is condensed by heat exchange with the cooling water cooled by the cooling device (15), and is evaporated in the evaporator (5), thereby cooling the room.

At that time, if it is necessary to increase the refrigerant condensing capacity in the condenser (2), such as when the indoor air conditioning load increases or when there is a peak cut request, the switching means (33)
As a result, the second circulation mechanism (32) is activated, and the water stored in the heat storage tank (9) in advance is circulated to the condenser (2), so that a condensing action is performed with a high condensing capacity. Able to meet demands for increased capacity.

In addition, if ice is made in the heat storage tank (9) to store cold heat, the heat storage tank (9) may The condensation action in the condenser (2) is performed using the stored cold heat of the water, and the heat storage tank (
9) Since all the ice inside the heat storage tank (9) is thawed, damage to each device during re-making of ice inside the heat storage tank (9) is effectively prevented, and
By stopping the cooling device (15) and reducing the operating capacity of the compressor (1), the total power consumption is reduced.

Further, in the invention of claim (21), in the operation of claim (1), when the condensing capacity is required, the first circulation mechanism (3
1) remains in operation, and the refrigerant after condensing in the condenser (2) is supercooled by the subcooling means (34), so it is possible to meet the demand for increased capacity, and to reduce the amount of ice remaining in the heat storage tank (9). When the amount should be used up, the second circulation mechanism (32) is activated by the switching means (33). Therefore, by switching the usage of the stored cold heat according to the operating conditions, damage to the device can be effectively prevented, and the effect of reducing the total power consumption can be further improved.

Furthermore, in the invention of claim (3), the ratio of cooling water supplied to the condenser (2) by the first circulation mechanism (31) and the second circulation mechanism (32) is variably adjusted by the adjustment means (35). Therefore, during cooling operation, when the condensing capacity of the condenser (2) is insufficient due to an increase in the temperature of the cooling water in the cooling device (15), the water that has been stored as cold heat at a low temperature is transferred from the second circulation mechanism (32) side. A large amount of water is supplied to the condenser (2) to meet a predetermined request for increased condensing capacity, and the same effects as the invention of claim (1) above, such as eliminating residual ice in the heat storage tank (9) and cutting peaks, are performed in a more detailed manner. It will be held on. Therefore, damage to the device is effectively prevented, and the effect of reducing total power consumption is further improved.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows the overall configuration of an air conditioner according to a first embodiment of the invention as claimed in claim (1), which includes a compressor (1), a heat source side heat exchanger (2) as a water-cooled condenser, First electromagnetic on-off valve (
3), a first automatic expansion valve (4) as a pressure reduction mechanism that reduces the pressure of the refrigerant, and a load-side heat exchanger (5) as an evaporator, and each of the above-mentioned devices (1) to ( 5) are sequentially connected by refrigerant pipes (7) to allow refrigerant to flow, and the cold heat provided by heat exchange with outdoor air in the heat source side heat exchanger (2) is transferred indoors to the load side heat exchanger (5). A main refrigerant circuit (8) dedicated to cooling that is transferred to the air is configured. Further, a heat storage tank (9) containing water as a heat storage medium is installed, and the heat storage tank (9) includes a heat storage coil as a heat exchange coil for exchanging heat between the water in the tank and the refrigerant. (10
) are placed. The liquid pipe (7a) and the gas pipe (7b) of the main refrigerant circuit (8) are connected by a first bypass path (11) so that the refrigerant can bypass the first bypass path (11). 11) has a second electromagnetic on-off valve (1
2), a second automatic expansion valve (13) for reducing the pressure of the refrigerant during heat storage operation, and a heat storage coil (10) provided in the heat storage tank (9) are interposed in order from the liquid pipe (7a) side. During the cooling heat storage operation, the heat storage coil (10) exchanges heat with the refrigerant to impart cold heat to the water serving as the heat storage medium in the heat storage tank (9).

On the other hand, the heat source side heat exchanger (2) has a cooling tower (15
), the cooling tower (15) and the heat source side heat exchanger (
2) and cooling water piping (16
) is attached.

Here, as shown in detail in FIG. 2, the cooling tower (15) includes a casing (15a), a fan (15b) installed in the upper part of the casing (15a),
A water storage tank (
15c) and the tank (1) via the pump (15d).
a pumping pipe (15e) that supplies water upward from 5c);
The water supplied from the pumping pipe (15e) is passed through the casing (
The cooling water pipe (16) is provided with a water sprinkler pipe (15f) for spraying water downward in the heat source side heat exchanger (2) via the first pump (17). A discharge pipe (16) that discharges cooling water to the cooling tower (15).
a), a supply pipe (16b) that supplies cooling water from the cooling tower (15) to the heat source side heat exchanger (2), and a water sprinkler pipe (15f) in the casing (15a) of the cooling tower (15) directly below. It consists of a cooling coil (16c) installed vertically above the coil. And cooling tower (
15), the water sprinkled by the water pipe (15f) is vaporized into a mist by the action of the wind supplied from above by the fan (15b), and the cooling water and heat in the cooling water coil (16c) are vaporized. By exchanging the refrigerant, the cooling water that has been warmed by the warm heat of the refrigerant in the heat source side heat exchanger (2) is recooled. The above cooling water pipe (16) and the first pump (1
7) constitutes a first circulation mechanism (31) that connects the cooling tower (cooling device) (15) and the heat source side heat exchanger (condenser) (2) so that cooling water can be circulated.

Here, as a feature of the present invention, the heat storage tank (9) and the heat source side heat exchanger (2) are connected via the second pump (19),
Water piping (18) connects the heat storage tank (9) so that water can be circulated as a heat storage medium, and during cooling operation, the water is stored in the heat storage tank (9) in the heat exchanger (2) on the heat source side. This allows the refrigerant to be directly condensed using the cooled heat. The water pipe (18) and the second pump (19) constitute a second circulation mechanism (32).

In the above air conditioner, during heat storage operation, the first electromagnetic on-off valve (3) is closed and the second electromagnetic on-off valve (12) is open, and the heat is condensed in the heat source side heat exchanger (2). The refrigerant is transferred from the main refrigerant circuit (8) to the first bypass path (11).
flows to the side. Then, the pressure is reduced by the tJ2 automatic expansion valve (13), and by heat exchange with the heat storage medium in the heat storage coil (10) in the heat storage tank (9), the heat storage medium is evaporated while imparting cold heat to the compressor (1 ).

On the other hand, during cold storage heat recovery cooling operation, the first electromagnetic on-off valve (3
) is opened and the second electromagnetic shut-off valve (12) is closed, the refrigerant condensed in the heat source side heat exchanger (2) does not flow to the first bypass path (11) side, and the main The refrigerant circulates through the refrigerant circuit (8).

Then, the pressure is reduced by the first automatic expansion valve (4), and the air is evaporated while imparting cold heat to the indoor air in the load-side heat exchanger (5), and returned to the compressor (1).

At that time, depending on the indoor air conditioning load and the state of remaining ice in the heat storage tank (9), if enough ice remains in the heat storage tank (9), the first pump (17) is stopped. , second pump (
19) to activate the second circulation mechanism (32) and supply the water in the heat storage tank (9) to the heat source side heat exchanger (2), while making sure that most of the remaining ice in the heat storage tank (9) is If there is no
The second pump (19) is stopped, the first pump (17-) is operated to activate the first circulation mechanism (31), and the cooling water cooled by the cooling tower (15) is transferred to the heat source side heat exchanger (
2).

Therefore, the first pump (17) and the second pump (1
9) is a first circulation mechanism (31) and a second circulation mechanism (32).
It has a function as a switching means (33) for selectively switching the supply of cooling water to the heat source side heat exchanger (condenser) (2).

Therefore, in the above embodiment, since the water in the heat storage tank (9) can be directly circulated to the heat source side heat exchanger (2) of the main refrigerant circuit (8), the second circulation mechanism (32) is activated. By doing so, a high condensation effect can be obtained by using the cold storage heat stored in water, which is a heat storage medium, in advance. In other words, the load side heat exchanger (5
), it is possible to improve the cooling effect. In addition, even when a peak cut is requested, by using the cold storage heat of water as a heat storage medium, the condensation pressure of the refrigerant in the heat source side heat exchanger (2) can be significantly lowered, and the compressor (1) can be reduced accordingly. This means that the operating capacity can be reduced to fully meet peak cut requests.

For example, in order to obtain a high cold storage heat effect, if the inside of the heat storage tank (9) is frozen by ice-making operation at night and the stored cold heat is used for air conditioning operation during the day, there may be excess ice at the end of the day. In such a case, the condition is detected by a temperature sensor, etc., and the cooling tower (15) and the first circulation mechanism (31
), activating only the second circulation mechanism (32), and switching to cooling operation that utilizes the cold heat stored in the heat storage tank (9), it is possible to thaw the ice in the heat storage tank (9). .

In other words, by using up the stored cold heat within the same day instead of holding it for a long time as in the conventional case, the heat storage tank (9) itself, the heat storage coil (10), etc. This makes it possible to effectively prevent damage to these devices without applying undue stress to them, and to reduce power consumption.

Furthermore, by circulating water as a heat storage medium through the direct heat source side heat exchanger (2), there is no need to switch the flow of refrigerant between cooling operation and normal cooling operation. Since this can be handled by activating and stopping the second pumps (17) and (19), the refrigerant condition is stabilized and the reliability of the entire device is improved.

In addition, in the first embodiment, the first
．． Instead of the second automatic expansion valves (4) and (13), it is also possible to arrange one having a closing function, such as an electronic control valve,
In that case, the above 1. Second electromagnetic on-off valve (4a), (13
a) can be omitted.

Further, the switching means (33) is the first switching means (33). 2nd pump (17
) and (19), but for example, the first. Second circulation mechanism (31).

It goes without saying that (32) may be connected in parallel to the heat source side heat exchanger (2) by a three-way valve or the like and configured by switching the three-way valve. An example will be explained based on FIGS. 3 to 7. FIG. 3 shows the overall structure of an air conditioner according to an embodiment of the invention of claim (2), and the basic structure is the same as that of the first embodiment.

Here, in this embodiment, the first and second circulation mechanisms (31) and (32) of the first embodiment are replaced with two switching three-way valves (2
0) and (21) are connected in parallel to the heat source side heat exchanger (2). That is, the discharge pipe (18a) and the supply pipe (18b) of the second circulation mechanism (32) each have the first. A second three-way valve (20), (21) is interposed, and a cooling water discharge pipe (18a) of the first circulation mechanism (31) is connected to the other boat of the two three-way valves (20), (21). and supply pipe (
18b) are connected to each other, and the painter's valve (20
), (21) causes the first. Second circulation mechanism (31
) and (32), the supply of water to the heat source side heat exchanger (2) is selectively switched. That is, 1st. Second
Three-way valve (20).

(21) constitutes a switching means (33).

Note that in this case, the first pump (17) is unnecessary,
A second pump (19) is commonly used to circulate both. Further, a bypass pipe (22) is provided between the discharge pipe (18a) and the supply pipe (18b) near the entrance and exit of the heat storage tank (9), so that water can be bypassed.
A flow control valve (23) for adjusting the amount of bypass is provided in the bypass pipe (22).

Here, as a feature of the invention of claim ('2J), the heat storage tank (
In addition to the heat storage coil (10), a subcooling coil (24) is arranged in 9), and the first electromagnetic on-off valve (3)
A second bypass path (25) extends from the front and back of and is connected to the subcooling coil (24) via a third electromagnetic on-off valve (26), and is connected to the subcooling coil (24) and the heat storage tank (9). , a supercooling mechanism (34) that supercools the refrigerant condensed in the heat source side heat exchanger (condenser) (2) with water in the heat storage tank (9).
is configured.

Figures 4 to 7 show the operating modes of the air conditioner, in which the solid arrows indicate the flow of refrigerant, and the dashed arrows indicate the flow of water as a heat storage medium and cooling water to the cooling device (15). ing. During cold storage heat operation, as shown in FIG.
Operation is performed with the third electromagnetic on-off valve (3) (26) closed and the second electromagnetic on-off valve (12) open, and the refrigerant condensed in the heat source side heat exchanger (2) is transferred to the first bypass path. (11) and is circulated so as to be evaporated in the heat storage coil (10), thereby imparting cold heat to the water in the heat storage tank (9), and predetermined cold heat storage is performed. At that time, both three-way valves (20) and (21) switch to the cooling tower (15) side for the cooling water of the heat source side heat exchanger (2), and the first
The circulation mechanism (31) operates, and the water in the heat storage tank (9) does not circulate to the heat source side heat exchanger (2).

In addition, during normal cooling operation, as shown in Figure 5, the circulation of cooling water is in the same state as above, and the first electromagnetic on-off valve (3
) opens, and the second. Operation is performed with the third electromagnetic on-off valves (12) and (26) closed, and the refrigerant condensed in the heat source side heat exchanger (2) evaporates in the load side heat exchanger (5) and Cool the room.

At that time, when the indoor air conditioning load becomes large, the first solenoid on-off valve (3) is closed and the third solenoid on-off valve (26) is opened to temporarily subcool the condensed refrigerant, as shown in Figure 6. After supercooling with the coil (24), the load side heat exchanger (5)
It is designed to supply That is, the cold storage heat is recovered by the subcooling coil (24).

On the other hand, if there is a peak cut request or if ice is likely to remain in the heat storage tank (9) due to the cooling operation that day,
The cold heat stored in the heat storage tank (9) is directly used to condense the refrigerant.

That is, as shown in FIG. 7, both three-way valves (20),
(21) to operate the second circulation mechanism (32) and supply water in the heat storage tank (9) to the heat source side heat exchanger (2). At this time, in order to adjust the condensing capacity of the refrigerant in the heat source side heat exchanger (2) according to the indoor air conditioning load, the opening degree of the flow control valve (23) of the bypass pipe (22) is adjusted. , heat source side heat exchanger (2)
The system is designed to adjust the amount of low-temperature water supplied to the

Therefore, in this embodiment, in addition to the structure of the invention of claim (1), a supercooling mechanism (3
4), it is possible to achieve the same effect as that of the invention of claim (1) above, and also to reduce indoor air conditioning load requirements, peak cut requirements, and the amount of ice remaining in the heat storage tank (9). Depending on factors such as this, the cold storage heat of water, which is a heat storage medium, can be used as a supercooling heat source or a condensing heat source, and by using the cold storage heat that matches the operating conditions, it is possible to obtain an even higher total power consumption saving effect. be.

Next, a third embodiment of the present invention will be described.

FIG. 8 shows the overall configuration of an air conditioner according to an embodiment of the invention of claim (3), and the configuration is almost the same as that of FIG. 3 above. In this embodiment, the above-mentioned 1. Second
Instead of the three-way valves (20) and (21), two three-way valves (20') and (21') having a flow rate adjustment function are arranged, and the two three-way valves (20' and (21')) According to 1st. A regulating means (35) is configured to variably regulate the supply ratio of cooling water to the heat source side heat exchanger (2) by the second circulation mechanisms (31) and (32). Note that the supercooling mechanism (34) is not necessarily required.

In this embodiment, as shown in FIG. 9, the temperature of the cooling water in the cooling tower (15) changes with the time of day, and is lower than the minimum water temperature Ts required for condensing the refrigerant in the heat source side heat exchanger (2). If the first. Second circulation mechanism (31), (3
By adjusting the cooling water supply ratio according to step 2), the cooling water temperature of the heat source side heat exchanger (2) can be maintained at a predetermined value.

For example, normally in the early morning, the temperature of the cooling water in the discharge pipe (16a) discharged from the heat source side heat exchanger (2) is 32°C, which is cooled to 27°C in the cooling tower (15).
During the day, the temperature of the cooling water in the discharge pipe (16a) reaches 37°C.
Assuming that the water rises to
℃) or below. In such a case,
For example, by supplying the water in the heat storage tank (9) to the heat source side heat exchanger (2) at a constant ratio to the cooling water from the cooling tower (15) by the regulating means (35), the temperature is increased to 27°C.
of cooling water can be supplied to the heat source side heat exchanger (2), and a predetermined cooling effect can be achieved. Further, even when the indoor load increases, the cooling water temperature can be adjusted in the same way, and as a whole, in addition to the effect of the invention of claim (1), the finer heat source side heat exchanger (2) This makes it possible to adjust the cooling water temperature and improve the overall power consumption saving effect.

Next, a fourth embodiment will be described based on FIGS. 10 to 14. FIG. 10 shows a modification of the second embodiment described above, in which the supercooling coil (14) is interposed not in the heat storage tank (9) but in the liquid pipe (7a) of the main refrigerant circuit (8). There is. Here, the supercooling coil (14) is connected to the casing (14).
a), and the casing (14a) allows water, which is a heat storage medium, to flow to the heat storage tank (9) via the second pump (19) through the discharge pipe (14b) and the supply pipe (14c). being done. A second three-way valve (
21) is interposed, and a water supply pipe (18b) extending from the other port of the second three-way valve (21) to the heat source side heat exchanger (2). A cooling water supply pipe (16b) from the cooling device (15) is connected to the supply pipe (18b). In addition, the second three-way valve (21) and the heat storage tank (9)
A discharge pipe (18a) for water from the heat source side heat exchanger (2) extends from a discharge pipe (14b) between the
A first three-way valve (20) is interposed in a). and,
A cooling device (
15) is connected to the cooling water discharge pipe (18a). Therefore, in this embodiment, the first circulation mechanism (31) is the second circulation mechanism (31). It is similar to the third embodiment, but the second circulation mechanism (
32) is the casing (14a) of the supercooled coil (14).
) water supply pipe (14c) and discharge pipe (14b) to
including the exhaust pipe (16a) to the heat source side heat exchanger (2).
), a supply pipe (16b) and a second pump (19).

In addition, (22') is the discharge pipe (14a) from the casing (14a) of the supercooling coil (14) to the heat storage tank (9).
A bypass pipe (23') for bypassing water is a flow control valve installed in the bypass pipe (22').

Here, to explain the operation mode in this embodiment, during the cold storage heat operation of the air conditioner, the first electromagnetic on-off valve (3
) is closed and the second electromagnetic on-off valve (12) is open. That is, as shown in FIG. 11, after the discharged gas refrigerant is condensed in the heat source side heat exchanger (2), it flows into the first bypass path (11) and is transferred to the heat storage tank (9) by the heat storage coil (10). On the other hand, the second circulation mechanism (32) is stopped, and the supply of cooling water to the heat source side heat exchanger (2) is carried out by the first circulation mechanism (see solid line arrow in the figure) to make ice. 31
) (see the dashed arrow in the figure). Further, during normal cooling operation, the second electromagnetic on-off valve (12) is closed and the first electromagnetic on-off valve (3) is opened. That is, as shown in Fig. 12, the refrigerant condensed in the heat source side heat exchanger (2) evaporates in the load side heat exchanger (5) and circulates to cool the room (solid line arrows in the figure). ) On the other hand, the circulation of cooling water is the same as in the above-mentioned cold storage heat operation. If the indoor cooling load increases or the cooling water temperature rises during cooling operation, and the condensing capacity in the heat source side heat exchanger (2) is insufficient, the Like, the second
Activating only the part of the circulation mechanism (32) on the side of the supercooling coil (14) to supply water, which is the heat storage medium of the heat storage tank (9), to the casing (14a) of the supercooling coil (14);
The refrigerant is subcooled to maintain a predetermined cooling capacity. Furthermore, if there is a peak cut request or if there is likely to be excess ice in the heat storage tank (9) on that day, the second circulation mechanism (32) is activated as a whole, as shown in FIG. The water in the heat storage tank (9) is transferred to the supercooling coil (
14) to the heat source side heat exchanger (2) (indicated by the broken line arrow in the figure), the stored cold heat is used up.

Therefore, in this embodiment, the same effects as in the second embodiment can be achieved, and the heat source side heat exchanger (
2) is supplied with water as a heat storage medium whose temperature has increased slightly through the supercooling coil (14), so very low temperature water is supplied to the heat source side heat exchanger (2) as in the second embodiment etc. Compared to conventional methods, it performs condensation and supercooling in a natural manner, so it is more efficient in using stored cold heat.

Next, a fifth embodiment, which is a further modification of the fourth embodiment, will be described with reference to FIGS. 15 to 19. Fig. 15 shows the overall configuration of an air conditioner according to an embodiment of the invention of claim (2). It is installed in That is, the heat storage coil (10) is directly interposed in the first bypass path (11), and its casing (10a) connects the heat storage tank (9) and two water pipes (10b).
).

(10c) is connected to allow water, which is a heat storage medium, to flow therethrough. Here, the second pump (19) is connected to the subcooling coil (14).
) is interposed in the supply pipe (14c) to the casing (14a) of the second pump (19) and the casing (14a).
A fourth three-way valve (29) is interposed in the supply pipe (14c) between a) and the supply pipe (14c). The casing (10) of the heat storage coil (10) is placed in the other hoard of the fourth three-way valve (29).
A water supply pipe (10c) to a) is connected.

In addition, a water discharge pipe (18a) from the heat source side heat exchanger (2) is also provided.
) The supercooling coil (1
A water discharge pipe (14b) from 4) is connected, and a third three-way valve (28) is interposed in the discharge pipe (14b). A water supply pipe (18b) to the heat source side heat exchanger (2) extends from the other boat of the third three-way valve (28), and its tip is connected to the first three-way valve (20). , a discharge pipe (14b) between the third three-way valve (28) and the second three-way valve (21)
) is connected to a water discharge pipe (10b) from the casing (10a) of the heat storage coil (10). therefore,
The second circulation mechanism (32) connects the pipe (1) to the casing (14a) of the supercooling coil (14) as in the fourth embodiment.
4b) and (14c), and the switching means (3
3) are the first to fourth three-way valves (20), (21), (28)
.

(29).

In addition, (22) is two water pipes (14c).

(16a) A bypass pipe connecting the space in a bypass manner;
(23) is a flow control valve installed in the bypass pipe (22), and its function is the same as in the second embodiment described above.

Next, to explain the operation mode in this embodiment, the electromagnetic on-off valve (3), (1
By switching 2), the refrigerant system is switched and operation is performed. That is, during cold storage heat operation, as shown in FIG. 16, the refrigerant condensed in the heat source side heat exchanger (2) flows to the first bypass path (11) side and evaporates in the heat storage coil (10). It circulates (solid line arrow in the figure). In addition, the switching means (3
3), cooling water is supplied to the heat source side heat exchanger (2) exclusively from the first circulation mechanism (31), that is, the cooling device (15) side, while the second circulation mechanism (32) does not operate. from the heat storage tank (9) to the casing (10) of the heat storage coil (10).
Water as a heat storage medium is supplied to a) (dashed line arrow in the figure),
Cold heat is imparted to water to store cold heat in the heat storage tank (9). During normal cooling operation, as shown in Figure 17,
The refrigerant condensed in the heat source side heat exchanger (2) is circulated so as to evaporate in the load side heat exchanger (5) (solid arrow in the figure). )
Water as a heat storage medium is not supplied from the heat storage tank (9) to the side, and only cooling water is circulated between the cooling device (15) and the heat source side heat exchanger (2) (dashed line arrow in the figure). . At that time, if there is a shortage of condensing capacity, the second pump (19) is operated as shown in FIG. Third. By switching the fourth three-way valves (21), (2g), and (29), the water in the heat storage tank (9) is circulated only toward the supercooling coil (14) (dashed line arrow in the figure), and the water after condensation is The refrigerant is further subcooled. Furthermore, if there is a peak cut request or if ice is likely to remain in the heat storage tank (9) after one day's operation, the first circulation mechanism (31) is stopped and the second circulation mechanism (32) is activated as a whole, and water, which is a heat storage medium, flows through the subcooling coil (14) side and circulates to the heat source side heat exchanger (2) (dashed line arrow in the figure).
.

Therefore, in this embodiment as well, the same effects as in the fourth embodiment can be obtained.

The present invention applies not only to an air conditioner without a switching mechanism for the main refrigerant circuit (8) as shown in FIG. It is also applicable.

(Effects of the Invention) As explained above, according to the invention of claim (1), in a regenerative air conditioner equipped with a condenser cooled by a cooling device and a heat storage tank containing water as a heat storage medium. The heat storage tank and condenser are connected to allow water circulation, and the supply of cooling water to the condenser can be switched between the cooling system and the heat storage tank as necessary, thereby preventing damage to the equipment. While effectively preventing this, it is possible to reduce the total power consumption by improving the utilization efficiency of cold storage heat.

Furthermore, according to the invention of claim (2), the above claim (1)
In addition to the above invention, the refrigerant condensed in the condenser is further supercooled using the cold heat stored in the heat storage tank, so the method of using the stored cold heat can be changed in response to changes in operating conditions, etc. The effect of reducing total power consumption can be further improved while effectively preventing damage to the device.

Moreover, according to the invention of claim (3), the above claim (1)
In the configuration of the invention, the usage ratio of cooling water to the condenser by the cooling device and the heat storage tank is variably adjusted according to the operating condition, so that more detailed use of the stored cold heat can be achieved.
According to claim (1), the effects of the invention can be more effectively exhibited.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a diagram showing a refrigerant system and cooling water piping of the first embodiment according to the invention of claim (1), FIG. 2 is a structural diagram of a cooling tower, and FIG. 3 is a diagram showing the refrigerant system and cooling water piping of the second embodiment according to the invention of claim (2), and FIGS. 4 to 7 show the operation modes in the second embodiment, which are respectively cold storage heat operation, cold storage heat operation, Diagram 8 showing the modes of normal cooling operation, cold storage heat recovery cooling operation as a supercooling source, and cold storage heat recovery cooling operation as a condensation source.
The figure shows the refrigerant system and cooling water piping of the third embodiment according to the invention of claim (3), FIG. A diagram showing the refrigerant system and cooling water piping of the fourth embodiment, FIGS. 11 to 14 are views corresponding to FIGS. 4 to 7 in the fourth embodiment, and FIG. 15 shows the refrigerant system and cooling water piping of the fifth embodiment. Figures 16 to 19 showing cooling water piping are equivalent to Figures 11 to 14 in the fifth embodiment. (1) Compressor, (2) Heat source side heat exchanger (condenser), (3) First automatic expansion valve (pressure reduction mechanism), (
5) Load side heat exchanger (evaporator), (8) Main refrigerant circuit, (9) Heat storage tank, (10) Heat storage coil (
heat exchange coil), (15)... cooling tower (cooling device), (31)... first circulation mechanism, (32) second
Circulation mechanism, (33)...Switching means, (34)...Supercooling mechanism,...Adjustment means. Figure Figure Figure 13 Figure 11 Figure Figure 1 Section 1 Figure 16

Claims (3)

[Claims] (1) Compressor (1), water-cooled condenser (2), pressure reduction mechanism (
4) and an evaporator (5) connected in sequence, and a main refrigerant circuit (8), and a heat storage tank (9) containing water as a heat storage medium.
and a heat exchange coil (10) for exchanging heat between the water in the heat storage tank (9) and the refrigerant, the cooling for cooling the cooling water in the condenser (2). A device (15), a first circulation mechanism (31) that connects the cooling device (15) and the condenser (2) so that cooling water can be circulated, and the heat storage tank (9) and the condenser (2). cooling to the condenser (2) by the second circulation mechanism (32) that connects the water in the heat storage tank (9) so that the water can be circulated, and the first circulation mechanism (31) and the second circulation mechanism (32). A regenerative air conditioner characterized by comprising a switching means (33) for selectively switching the supply of water. (2) Compressor (1), water-cooled condenser (2), pressure reduction mechanism (
4) and an evaporator (5) connected in sequence, and a main refrigerant circuit (8), and a heat storage tank (9) containing water as a heat storage medium.
and a heat exchange coil (10) for exchanging heat between the water in the heat storage tank (9) and the refrigerant, the cooling for cooling the cooling water in the condenser (2). A device (15), a first circulation mechanism (31) that connects the cooling device (15) and the condenser (2) so that cooling water can be circulated, and the heat storage tank (9) and the condenser (2). cooling to the condenser (2) by the second circulation mechanism (32) that connects the water in the heat storage tank (9) so that the water can be circulated, and the first circulation mechanism (31) and the second circulation mechanism (32). A switching means (33) for selectively switching the supply of water, and a supercooling mechanism (34) for supercooling the refrigerant condensed in the condenser (2) with water in the heat storage tank (9). A heat storage air conditioner featuring: (3) Compressor (1), water-cooled condenser (2), pressure reduction mechanism (
4) and an evaporator (5) connected in sequence, and a main refrigerant circuit (8), and a heat storage tank (9) containing water as a heat storage medium.
and a heat exchange coil (10) for exchanging heat between the water in the heat storage tank (9) and the refrigerant, the cooling for cooling the cooling water in the condenser (2). A device (15), a first circulation mechanism (31) that connects the cooling device (15) and the condenser (2) so that cooling water can be circulated, and the heat storage tank (9) and the condenser (2). cooling to the condenser (2) by the second circulation mechanism (32) that connects the water in the heat storage tank (9) so that the water can be circulated, and the first circulation mechanism (31) and the second circulation mechanism (32). A regenerative air conditioner characterized by comprising: an adjusting means (35) for variably adjusting the water supply ratio.