JPH09178285A - Regenerative type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption in a peak power time zone by providing a supplementary water heat exchanger between a heat exchanger for supercooling and an outdoor heat exchanger and providing a water pipe path for allowing water in a heat storage tank to circulate in the supplementary water heat exchanger when a high pressure or an external air temperature is under the preset conditions. SOLUTION: A high-pressure control valve 20 increases its opening degree in proportion to an increase in pressure in a liquid tube 7, which is detected through a pressure detection path 21, i.e., an increase of a discharge pressure, and the amount of water to pass through a supplementary water inlet pipe 16' and to be fed to a supplementary water heat exchanger 19 is increased. The high-pressure control valve 20 is in a closed state up to a predetermined level of an external air temperature, and, when an external air temperature exceeds a predetermined level thereof to cause an increase in the discharge pressure of a compressor 1, the valve 20 is gradually opened, whereby cold water in a heat storage tank 9 is led to the supplementary water heat exchanger 19 through the supplementary water inlet pipe 16' to cool a liquid refrigerant from an outdoor heat exchanger 3. In this manner, an increase of the discharge pressure becomes small, the discharge pressure and power consumption are held at a fixed level, and an increase of power consumption at a peak power time is restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage type air conditioner for cooling the heat stored in a heat storage tank at night when the power cost is low and discharging the heat when demanded in the daytime.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of an ice heat storage type air conditioner. In FIG. 4, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a receiver, 18 is a throttle,
Reference numerals 6 and 6'indicate indoor heat exchangers installed in parallel, and reference numerals 5 and 5'represent a cooling throttle. A subcooling heat exchanger 8 is provided in a liquid pipe 7 of a refrigeration cycle formed by connecting these devices. Has been.

Reference numeral 14 is a gas pipe connecting the indoor heat exchangers 6 and 6'to the four-way valve 2, and the gas pipe 14 and the liquid pipe 7 are connected by a bypass pipe 41. The bypass pipe 41 is provided with a valve 10, an expansion valve 12,
Ice heat exchanger 11 and check valve 1 installed in the heat storage tank 9.
3 are arranged in series.

Reference numerals 16 and 17 denote a water inlet pipe and a water outlet pipe connecting the inside of the heat storage tank 9 and the subcooling heat exchanger 8, and a water pump 15 for circulating water in these circulation paths. Is. Reference numeral 10 'is a valve provided in the liquid pipe 7.

In the ice heat storage type air conditioner configured as described above, when cold heat is stored by using inexpensive electric power at night, the valve 10 is opened and the valve 10 'is closed to close the compressor 1. By operating, the refrigerant flow path shown by the solid line arrow in FIG. 4 is constituted, and the compressor 1 is passed through the four-way valve 2, the outdoor heat exchanger (condenser) 3, the throttle 18, the liquid pipe 7 and the valve 10. The refrigerant is decompressed by the expansion valve 12 and evaporated by the ice-making heat exchanger 11 to take heat from the water in the heat storage tank 9, which is then cooled to ice water.

During cooling in the daytime, the valve 10 is closed and the valve 10 'is opened to operate the compressor 1 so that the valve shown in FIG.
Refrigerant flow paths shown by the broken line arrows are formed, and the refrigerant that has passed from the compressor 1 through the outdoor heat exchanger 3, the throttle 18, the liquid pipe 7, the supercooling heat exchanger 8 and the like is drawn by the throttles 5 and 5 '. The pressure is reduced and evaporated in the indoor heat exchangers 6 and 6'to remove heat from the indoor air to cool the room.

During the cooling operation, the water pump 15 is operated to circulate the cold water in the heat storage tank 9 into the subcooling heat exchanger 8 to cool the liquid refrigerant.

That is, as shown in the Mollier diagram of FIG. 5, the refrigerant temperature at the inlets of the throttles 5 and 5'is cooled from T to T'by the heat exchanger 8 for supercooling, whereby the effective enthalpy is i. To i '. This allows
As shown in FIG. 3, the electric power required for daytime cooling is A
Line is reduced to A'line.

Further, the ice storage type air conditioner as described above has a problem that the cold heat cannot be effectively used but only the cold heat is stored when the cooling load is small. Japanese Patent Publication 7-8898
The technology of No. 7 is proposed. In this technique, the cold heat in the heat storage tank 9 is directly exchanged with the refrigerant so as to be switched and used as a heat source for supercooling or a heat source for condensation.

[0010]

In the conventional ice storage type air conditioner as shown in FIG. 4, the capacity of the outdoor heat exchanger 3 depends on the outside air temperature, and when the outside air temperature rises,
As shown by the broken line in FIG. 2, the discharge pressure P rises, and the peak power hours during the daytime (for example, time 13.
(Between 00 and 16.00) has a problem that the power consumption W also increases as shown by the broken line in FIG.

Further, in the technique proposed in Japanese Patent Publication No. 7-88987, since cold heat is switched and used as a heat source for supercooling or a heat source for condensation, the power consumption at the peak power as described above is reduced. Insufficient to suppress.

An object of the present invention is to reduce the power consumption during cooling in the daytime by a certain percentage in a heat storage type air conditioner, and to suppress the increase in power consumption even when the outside air temperature rises, thus reducing the power consumption during peak power hours. It is to significantly reduce power consumption.

[0013]

Means for Solving the Problems The present invention solves the above problems, and the gist of the invention is to provide a compressor, an outdoor heat exchanger, a throttle means, and at least one indoor heat exchanger as a refrigerant. A refrigerating cycle is configured by connecting with a pipe, and between the liquid pipe and the gas pipe of the same refrigerating cycle, a heat exchanger for ice making arranged in a heat storage tank containing water is connected,
A heat storage type air conditioner comprising a supercooling heat exchanger for supercooling a liquid refrigerant by exchanging heat with water in the heat storage tank during the refrigeration cycle, wherein the supercooling heat exchanger and the outdoor Between the heat exchanger and an auxiliary water heat exchanger for cooling the refrigerant from the outdoor heat exchanger, and when the high-pressure pressure or the outside air temperature for the auxiliary water heat exchanger is in the set condition, The heat storage type air conditioner is characterized in that a water pipe system passage for circulating water in the heat storage tank to the auxiliary water heat exchanger is provided.

In the above means, a control valve for opening and closing the water inlet side pipe of the auxiliary water heat exchanger is provided, and the control valve is provided on the auxiliary water heat exchanger outlet side. It is also a specific means of the present invention that the high pressure control valve for controlling the refrigerant pressure of the above to a predetermined pressure or less is used.

According to the above means, during cooling, when the pressure of the refrigeration cycle exceeds a certain pressure or the outside air temperature exceeds a certain temperature, the control valve opens to guide the cold water in the heat storage tank to the auxiliary water heat exchanger. The cold water cools the liquid refrigerant from the outdoor heat exchanger, and the refrigerant cooled here is further supercooled by the supercooling heat exchanger.

Due to the flow of the cooling water to the auxiliary water heat exchanger, the rise of the refrigerant pipeline pressure is suppressed to maintain a substantially constant pressure, which increases the power consumption especially at the peak power. Suppressed.

Further, in the above means, the water piping system for the auxiliary water heat exchanger is connected in parallel with the water piping system for the supercooling heat exchanger, and one water pump is installed on the supply side. That is also a concrete means of the present invention.

According to such means, the cooling water can be circulated to the two heat exchangers of the supercooling heat exchanger and the auxiliary water heat exchanger by one water pump, and the apparatus is simplified,
Cost reduction is achieved.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a system diagram of an ice heat storage type air conditioner according to an embodiment of the present invention.

In FIG. 1, 1 is a compressor, 2 is a four-way valve,
3 is an outdoor heat exchanger, 4 is a receiver, 18 is a throttle, 6 and 6'are indoor heat exchangers installed in parallel, and 5 and 5'are provided at the inlets of the indoor heat exchangers 6 and 6 '. A supercooling heat exchanger 8 for exchanging heat between cold water and a refrigerant in a heat storage tank 9, which will be described later, is provided in a liquid pipe 7 of a refrigerating cycle which is a cooling throttle and is formed by connecting these devices.

Reference numeral 14 is a gas pipe connecting the indoor heat exchangers 6 and 6'to the four-way valve 2. The gas pipe 14 and the liquid pipe 7 are connected to each other by a bypass pipe 41. The bypass pipe 41 is provided with a valve 10, an expansion valve 12,
Ice heat exchanger 11 and check valve 1 installed in the heat storage tank 9.
3 are arranged in series.

Reference numerals 16 and 17 denote water inlet pipes and water outlet pipes for connecting the inside of the heat storage tank 9 and the heat exchanger 8 for supercooling, and 15 denotes a water pump for circulating water in these circulation paths. Is. Reference numeral 10 'is a valve provided in the liquid pipe 7.

Reference numeral 19 denotes an auxiliary water heat exchanger provided in the refrigerant pipe, that is, the liquid pipe 7 between the outdoor heat exchanger 3 and the receiver 4. The auxiliary water heat exchanger 19 has the heat storage tank. Auxiliary water inlet pipe 1 branched from a water inlet pipe 16 connected to
6'and auxiliary water outlet pipe 1 branched from the water outlet pipe 17
7'is connected to exchange heat between the cold water in the ice heat storage tank 9 and the refrigerant passing through the liquid pipe 7.

Therefore, the water inlet pipe 16 'and the outlet pipe 17' to the auxiliary water heat exchanger 19 and the water inlet pipe 16 and the outlet pipe 17 to the supercooling heat exchanger 8 are one water. Pump 1
In 5, the cold water is circulated to form parallel water channels.

Reference numeral 20 is a high pressure control valve which is provided in the auxiliary water inlet pipe 16 'and controls the opening and closing of this pipe. The pressure in the liquid pipe 7 at the outlet of the auxiliary water heat exchanger 19 is guided to the high-pressure control valve 20 via the pressure detection path 21, and the control valve 20
The opening is adjusted by the pressure in the liquid pipe 7.

In the ice heat storage type air conditioner constructed as described above, when cold heat is stored by using inexpensive electric power at night, the valve 10 of the bypass pipe 41 is opened and the valve of the liquid pipe 7 is opened. When 10 ′ is closed and the compressor 1 is operated, the refrigerant liquid condensed in the outdoor heat exchanger 3 flows as shown by the solid arrow in FIG. 1, passes through the valve 10, is decompressed by the expansion valve 12, and the heat storage tank 9
In the ice-making heat exchanger 11 therein, heat is absorbed from the water in the heat storage tank 9 to be vaporized and gasified, and then sucked into the compressor 1 from the gas pipe 14 through the four-way valve 2. The water that has absorbed heat in the heat storage tank 9 is cooled and stored as ice-mixed water around the ice-making heat exchanger 11.

During the daytime cooling, the valve 10 is closed and the valve 10 'is
When the compressor 1 and the water pump 15 are operated with the open state, the refrigerant condensed in the outdoor heat exchanger 3 is cooled by the cold water from the heat storage tank 9 in the auxiliary heat exchanger 19 as described later, and the receiver 4 Through the heat exchanger 8 for supercooling.

In the heat exchanger 8 for supercooling, the refrigerant exchanges heat with the cold water in the heat storage tank 9 which is made to flow through the water inlet pipe 16 and the water outlet pipe 17 by the water pump 15. As shown in the Mollier diagram of No. 1, after being cooled from the temperature T to T ', the pressure is reduced by the cooling throttles 5 and 5', evaporated in the indoor heat exchangers 6 and 6 ', and taken away from the indoor air, The room is cooled and sucked into the compressor 1.

The high pressure control valve 20 has the pressure detecting passage 2
1, the opening of the liquid pipe 7 increases in proportion to the rise in the pressure in the liquid pipe 7, that is, the discharge pressure P, and the auxiliary water heat exchanger 1
The amount of water passing through the auxiliary water inlet pipe 16 'to the water inlet 9 is increased. The high-pressure control valve 20 is closed up to a constant outside air temperature T ₀ in FIG. 2, and when the outside air temperature exceeds T ₀ and the discharge pressure of the compressor 1 rises, it gradually opens and the inside of the heat storage tank 9 is closed. Of the cold water is guided to the auxiliary water heat exchanger 19 through the auxiliary water inlet pipe 16 'to cool the liquid refrigerant from the outdoor heat exchanger 3.

Due to the flow of the cold water to the auxiliary water heat exchanger 19, the rise of the discharge pressure P is reduced, and the discharge pressure P and the power consumption W have the constant values shown by the solid line in FIG. This is held, and as a result, as shown by the solid line in FIG. 3, an increase in the power consumption W during peak power is suppressed.

Incidentally, the high pressure control valve 20 in the above embodiment.
Instead of the above, a control valve for adjusting the opening degree of the auxiliary water inlet pipe 16 'to the auxiliary water heat exchanger 19 according to the detection signal of the outside air temperature may be provided, or the above-mentioned discharge pressure or outside air temperature A control valve for opening and closing the auxiliary water inlet line 16 'may be provided.

[0032]

The present invention is configured as described above.
According to the present invention, when the outside air temperature rises or the refrigerant pipeline pressure rises, the cold water in the heat storage tank flows through the auxiliary water heat exchanger to cool the refrigerant, so that even if the outside air temperature rises, It is possible to suppress an increase in power consumption, and particularly to suppress an increase in power consumption during peak power consumption.

According to the present invention, the cooling water can be circulated to the two heat exchangers, the supercooling heat exchanger and the auxiliary water heat exchanger, by one water pump. Is simplified and the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram of an ice heat storage type air conditioner according to an embodiment of the present invention.

FIG. 2 is a diagram showing a change in power consumption in the ice heat storage type air conditioner.

FIG. 3 is a diagram showing a relationship between outside air temperature, power consumption, and discharge pressure in the air conditioner.

FIG. 4 is a system diagram of a conventional ice storage type air conditioner.

FIG. 5 is a Mollier diagram in the air conditioner.

[Explanation of symbols]

 1 compressor 2 four-way valve 3 outdoor heat exchanger 4 receiver 5,5 'throttle 6,6' indoor heat exchanger 7 liquid pipe 8 supercooling heat exchanger 9 heat storage tank 10, 10 'valve 12 expansion valve 14 gas pipe 15 Water Pump 16 Water Inlet Pipe 16 'Auxiliary Water Inlet Pipe 17 Water Outlet Pipe 17' Auxiliary Water Outlet Pipe 19 Auxiliary Water Heat Exchanger 20 High Pressure Control Valve 21 Pressure Detection Path 41 Bypass Pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Otsuka 3-1, Asahicho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory

Claims (4)

[Claims] 1. A refrigeration cycle is constructed by connecting a compressor, an outdoor heat exchanger, a throttle means, and at least one or more indoor heat exchangers with a refrigerant pipe, and between the liquid pipe and the gas pipe of the same refrigeration cycle. In, while connecting the ice-making heat exchanger disposed in the heat storage tank containing water, during the refrigeration cycle,
In a heat storage type air conditioner comprising a supercooling heat exchanger for subcooling the liquid refrigerant by exchanging heat with water in the heat storage tank, between the supercooling heat exchanger and the outdoor heat exchanger. The auxiliary water heat exchanger for cooling the refrigerant from the outdoor heat exchanger is provided, and when the high-pressure pressure or the outside air temperature is in the setting condition for the auxiliary water heat exchanger, the water in the heat storage tank is A heat storage type air conditioner, characterized in that a water pipe system passage for circulating the auxiliary water heat exchanger is provided. 2. The water inlet side conduit of the auxiliary water heat exchanger,
The heat storage type air conditioner according to claim 1, further comprising a control valve that opens and closes the pipeline. 3. The heat storage type air conditioner according to claim 2, wherein the control valve is a high-pressure control valve for controlling the refrigerant pressure at the outlet side of the auxiliary water heat exchanger to a predetermined pressure or less. 4. A water pipe line for the auxiliary water heat exchanger is connected in parallel with a water pipe line for the subcooling heat exchanger, and one water pump is installed on the supply side. Item 3. The heat storage type air conditioner according to item 1 or 2.