JPH0823421B2 - Heat storage heat pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a heat storage heat pump that can be used both in summer and winter in one unit.

[Conventional technology]

Conventionally, as a heat storage means in a building, for example, in a small building of 3000 m ² or less, as shown in FIG. 4, an air heat source heat pump HP is installed on a rooftop V, and a plurality of rooftops V or a plurality of basements S are installed. The heat storage coil Wc provided in the water tank W is connected by a pipe p to store heat in the water w of the water tank W. Brine is circulated between the heat pump HP and the heat storage coil Wc to store ice heat in summer and hot water heat in winter. Then, the water w is sent to a required room in the building by a secondary pump for air conditioning.

The heat pump HP includes a compressor A that heats a gas refrigerant to a high pressure and a high temperature, an air heat exchanger C that exchanges heat with the outside air a sucked and discharged by a fan F, and a heat exchanger B that heats and cools brine. And a coil Bc connected to the pipe p is provided in the heat exchanger B.

Further, in recent years, in large-scale buildings of 10,000 m ² or more, heating type heat pumps using a turbo compressor have also appeared, as shown in FIGS. 5 and 6.

FIG. 5 is a schematic configuration diagram showing a heating operation flow. In the figure, 61 is a heating tower and 62 is the tower 61.
A water replenishing valve for replenishing the water for adjusting the concentration of the brine b to the bottom of the, a heat pump unit 63, an evaporator 64 for the refrigerant r
A cooling water condenser 65, a hot water condenser 66, a main compressor 67 and a booster compressor 68. Then, the downflow pipe 69 from the bottom of the tower 61 reaches the brine pump 70 via the coil 64c of the evaporator 64, and from the pump 70, the tower
An ascending pipe 71 is introduced into the upper part of the 61, and a brine collecting pipe 72, a brine tank 73, and a brine injection pipe 75 having a brine injection pump 74 are provided in parallel with the descending pipe 69.

Further, 76 is a water supply pump, which is a water tank (for hot water in this case)
Intake pipe 78 for inhaling hot water wh from 77 and hot water condenser 66
It is connected to the discharge pipe 79 which returns to the water tank 77 via the coil 66c.

In the above configuration, during the heating operation in the winter season, the brine b cooled by the heat pump unit 63 and kept at, for example, −11 ° C. lower than the outside air a is sprayed into the heating tower (which becomes the cooling tower in the summer) 61. , Contact with outside air (wet bulb temperature -1.5 ° C) a and heat to -7 ° C. The brine b flows into the coil 64c of the evaporator 64 of the heat pump unit 63 and heats the low-temperature refrigerant r to evaporate at -16 ° C, but the brine b is cooled to -11 ° C by the evaporator 64 and is again cooled. Return to heating tower 61. The circulation path of this brine b is shown by a thick solid line.

On the other hand, the evaporated refrigerant r is compressed into high temperature and high pressure by the two compressors 67 and 68, is carried to the hot water condenser 66, gives heat to the hot water wh in the coil 66c, condenses it at 53 ° C, and then the evaporator 6
Returning to 4, the temperature of the hot water wh rises to 45 ℃ and returns to the water tank 77 for storage. The circulation path of this warm water wh is shown by a thick broken line.

Further, during the cooling operation in the summer, as shown in the schematic configuration diagram of the cooling operation flow in FIG. 6, the heating tower 61 becomes the cooling tower 61 ′, the brine pump 70 becomes the cooling water pump 70 ′, and the brine b becomes Brine tank
While being collected in 73, it replaces the water supplied from the water supply valve 62, that is, the cooling water wr. And the cooling tower
The downflow pipe 69 ′ from 61 ′ is guided to the suction port of the cooling water pump 70 ′ via the coil 65c in the cooling water condenser 65,
Further, a discharge pipe 79 'from a water pump (for cold water in this case) 76' is led to a water tank (for cold water in this case) 77 'via a coil 64c in the evaporator 64, by which a general turbo refrigeration is carried out. In the same combination system as the machine, the cooling water wr flows along the circulation path shown by the thick dashed line, while the water tank 77 '
The cold water wc in the inside circulates along the path indicated by the thin broken line, but the description of the action relating to the transfer of heat is omitted.

[Problems to be Solved by the Invention]

However, in the case of such a conventional heat pump, in the former case, in order to apply it to a large building, it is necessary to install a large number of units, and at the time of defrosting during heating, the heating is temporarily disabled and the auxiliary heat pump is used. It is necessary to install a boiler in.

In addition, the latter heating tower system has a fatal drawback that it cannot store the most important element, ice heat storage.

In recent years, heat storage has been sought for cooling and heating of buildings, and in particular, during cooling in the summer, a compact and highly efficient device such as ice heat storage has been demanded. Moreover, there is an urgent need to develop a device that can be used both for summer and winter for annual heating and cooling.

The present invention has been made in view of the above circumstances, has a simple configuration, and performs operation state conversion between cooling and heating by mutually exchanging brine and cooling water in a tower system circulation path, and further converting The purpose of the present invention is to obtain a heat storage type heat pump that is extremely easy to operate, has a high energy saving effect, and is highly efficient.

[Means for solving the problem]

The heat storage type heat pump according to the present invention comprises a tower system circulation path from a roof heating and cooling tower, a water tank system circulation path from an in-tank coil, a plurality of three-way valves, and connecting pipes respectively connected to these three-way valves. By combining the conversion system paths and changing the path of the three-way valve, the combination of the two circulation paths communicating with the condenser and the evaporator of the heat pump unit is changed according to summer and winter, respectively, and the brine The water and water are used interchangeably.

In the winter, there is also a configuration in which water in the water tank for air conditioning is directly used in the water tank system circulation path, and a forward three-way valve and a return three-way valve are provided.

[Action]

Due to the above configuration, during summer cooling, the tower system circulation path from the cooling and heating tower (for cooling) is filled with water and connected to the condenser, and the water tank system circulation path is filled with brine and the evaporator is installed. And heat exchange with each other to cool the water in the water tank by the coil in the water tank.

During winter heating, all three-way valves in the conversion system path are switched, and the tower system circulation path from the cooling and heating tower (for heating) is equipped with an evaporator to be filled with brine, while
The water tank system circulation path is filled with water by including a condenser, and heat exchange is performed on each of them to heat the water in the water tank by the coil in the water tank.

In winter, as another means, if the water tank coil is removed by switching the outflow and return three-way valves from the water tank system circulation path to communicate with the water tank water, the water tank water is guided to the condenser. It heats the water in the aquarium and heats it by sending the water in the water tank to the air conditioner.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

 First, the configuration will be described.

In FIG. 1 showing the schematic configuration of the present embodiment in a state of being used in summer, 1 is water installed from the spreader 17 installed on the rooftop of the building by the outside air a sucked and discharged by the fan 1f. A cooling and heating tower (which acts as a cooling tower 1C in this case) for cooling w is a heat pump unit 2 which is composed of a compressor 3, a condenser 4 and an evaporator 5 in combination. Reference numeral 6 denotes a water tank which is provided in plural in the basement and communicates with each other in the vertical direction.

The tower system circuit 10 is the cooling tower 1C.
Downstream pipe 11-first three-way valve 31-water absorption pipe 12 connected to the bottom of the
− Water pump 13 − Inlet pipe 14 − Condenser coil 4c − Outlet pipe
On the other hand, the water tank system circulation path 20 is formed by the 15-second three-way valve 32-the upflow pipe 16-the sprinkler 17 and joins the outflow branch pipes 21s rising from the respective water tank coils 6c of the plurality of water tanks 6. Outflow pipe 21-Third three-way valve 33-Liquid suction pipe 22-Brine pump 23-Inlet pipe 24-Evaporator coil 5c-Outlet pipe 25-Fourth three-way valve 34-
It is formed by a circuit of the reflux pipe 26-the reflux branch pipe 26s-the coil 6c in the water tank.

Further, the conversion system passage 30 is a second connecting pipe 35 branched from the first three-way valve 31 and connected to the liquid suction pipe 22, and a second connecting pipe 35 branched from the second three-way valve 32 and connected to the return pipe 26. Connection pipe 36, third connection pipe 37 branched from the third three-way valve 33 and connected to the water absorption pipe 12
And a fourth connecting pipe 38 branched from the fourth three-way valve 34 and connected to the ascending pipe 16.

The air conditioning system circulation path 40 passes through the fifth three-way valve 45, the secondary pump 43, and the sixth three-way valve 46, which are arranged in parallel with the M main pipe 41 connected to the lower portion of the side wall 6S of the water tank 6, and then each chamber. In the air conditioner AHU of No. 7, the 7th three-way valve 4 installed in parallel with the M path guided by the branch pipe 49a and the N main pipe 42 attached to the upper part of the side wall 6S.
7, After passing through the 8th three-way valve 48, branch pipe 4 to the air conditioner AHU
N path guided by 9b and connecting pipes 45r, 46r, which are connected from each three-way valve 45, 46, 47, 48 to another main pipe 41 or 42, respectively.
It is composed of 47r and 48r.

Although not shown in the drawings, an injection pipe with a blocking valve connected to the outlet pipe 25 (or the inlet pipe 24) from a brine tank installed in the basement via a brine supply pump, and the outlet pipe 25.
A collection pipe with a blocking valve from the roof tank to the brine tank is provided, and a water supply pipe with a water supply valve is introduced from the elevated water tank on the roof to the outlet pipe 15 (or the introduction pipe 14) and drainage is performed. A valve is also provided.

Therefore, for switching between cooling and heating, the first
~ In addition to the switching operation of the fourth three-way valves 31 to 34, the brine b and the water w are exchanged.

That is, the brine b is stored once in the brine tank, the water w is completely drained from the other piping system, and then the three-way valves 31 to 34 are switched to the brine system using the brine replenishing pump. Fill. Then, water w is replenished from the elevated water tank to the piping system from which the brine b has been removed.

 Next, the operation will be described.

In the case of summer air conditioning, as shown in Fig. 1, each three-way valve
Set all 31,32,33,34 to the direct connection state before use.

First, in the tower system circuit 10, the water pump 13
The 32 ° C. water w sent from the heat pump 2 takes heat from the refrigerant r in the condenser 4 by the coil 4c in the condenser of the heat pump 2.
The temperature rises to 37 ℃ and the ascending pipe 1 through the outlet pipe 15 and the second three-way valve 32
It reaches the spreader 17 from 6 and is diffused into the cooling tower 1C. Therefore, the water w dissipated by the outside air a at 32 ° C. is deprived of heat, cools, accumulates at the bottom of the tower 1C, and then flows down the downcomer pipe 11 to pass through the first three-way valve 31 and the water absorption pipe 12. Returning to the water pump 13, a cooling cycle is performed using the water w shown by the thick solid line.

On the other hand, in the water tank system circuit 20, the brine pump
The brine -4 ° C brine b sent from 23 is deprived of heat by the refrigerant r in the evaporator 5 by the coil 5c in the evaporator, and is -8 ° C.
It was cooled to, discharge pipe 25, the fourth three-way valve 34, enters from the reflux branch pipe 26s through the return pipe 26 to the respective water tank coil 6c, removes heat from the water w ₆ in the water tank 6 which is cooled The temperature is raised to -8 ° C, but the temperature rises to -4 ° C, and it goes through the outflow branch pipe 21s, the outflow pipe 21, the third three-way valve 33, and the liquid suction pipe 22 to the brine pump 23 again by a double line. The cooling cycle with the indicated brine b is performed.

This cooling cycle not only cools the water w ₆ in the water tank,
Create ice around the coil 6c in the aquarium and grow it. This makes it possible to store a large amount of cold heat in a small heat storage water tank.

Further, by operating this brine heat pump at night, a cheap night charge can be used.

The water in the water tank w ₆ is sent to the air conditioner AHU in the required room by the M path of the air conditioning system circulation path 40, and the circulation path that returns to the water tank 6 through the N path is used to cool the building. .

In addition, for winter heating, each three-way valve of the conversion route 30
As shown in FIG. 2, the parts 31 to 34 are turned 90 degrees counterclockwise from the direct state of summer cooling to establish a bent passage state.
Therefore, the tower system circuit 10 'is provided with a brine pump 23-
Inlet pipe 24-evaporator coil 5c-outlet pipe 25-fourth three-way valve 34
-Fourth connection pipe 38-Upflow pipe 16-Sprayer 17-Heating tower 1H-Downcomer pipe 11-First three-way valve 31-First connection pipe 35-Liquid suction pipe 22-Double line of brine pump 23 The 0 ° C. brine b formed in the path indicated by and is sent from the brine pump 23 is deprived of heat by the refrigerant r in the evaporator 5 by the in-evaporator coil 5c and cooled to −11 ° C. Spreader along the path
It is guided by 17 and scattered in the heating tower 1H. At this time, the brine b, which has taken heat from the outside air a of 0 ° C. and has been heated to −7 ° C., returns to the brine pump 23 through the downcomer 11 and again undergoes a heating cycle by the brine b indicated by the double line.

On the other hand, the water tank circulation circuit 20 'is the water supply pump 13-introduction pipe.
14-coil 4c in condenser-outlet pipe 15-second three-way valve 32-second
Connection pipe 36-Recirculation pipe 26-Recirculation branch pipe 26s-Water tank coil 6c-
Outflow branch pipe 21s-Outflow pipe 21-Third three-way valve 33-Third connecting pipe 37
-Water absorption pipe 12-Water w at 40 ° C. which is formed in the path indicated by the thick solid line of the water supply pump 13 and is sent out from the water supply pump 13.
Is heated by the coil 4c in the condenser to heat the refrigerant r in the condenser 4 to 45 ° C., and is guided to the coil 6c in the water tank to heat the water w ₆ in the water tank 6 to 45 ° C. While raising the temperature,
Return to water pump 13 at 40 ° C Water w shown by thick solid line
Heating cycle. Then, the water in the water tank w ₆ heated to 45 ° C. is the three-way valves 45, 46, 47, 4 of the air conditioning system circulation path 40.
After rotating 8 through 90 degrees clockwise to communicate with each of the connecting pipes 45r to 48r, the secondary pump 43 sends the air from the upper part of the side wall 6S of the water tank 6 to the air conditioner AHU by the secondary pump 43 in the same way. The interior of the building is heated by the circulation route that returns to the bottom of the side wall 6S along the return route indicated by the solid line.

 Next, another embodiment will be described with reference to FIG.

In this embodiment, the water tank system circulation path 20 ″ is used as a heat storage circuit for the heating operation in the winter, the water tank coil 6c is excluded from the path, and the water tank water w ₆ is fed into the condenser coil of the heat pump unit 2. The water tank internal water direct heating system path 50 is additionally provided so as to be directly guided to the water tank 4c, and other configurations are similar to those of the water tank system circulation path 20 'described above.

The warming system path 50 is provided with an outflow pipe 52 which connects the outflow three-way valve 51 provided in the outflow pipe 21 and a lower part of one side wall 6S of the water tank 6 in front of the intake port of the water pump 13. , Second
Between the connecting pipe 36 and the reflux branch pipe 26s, a reflux three-way valve 53 provided on the reflux pipe 26 and a return water pipe 54 that connects the upper part of the other side wall 6S 'of the water tank 6 are provided.

Therefore, the water in the water tank w ₆ is heated by the direct heat from the coil 4c in the condenser by the water tank system circulation path 20 ″ by setting the outward three-way valve 51 and the return three-way valve 53 in a bent passage state, and Since the heating sent to the air conditioner AHU is performed by the air conditioning system circulation path 40, the thermal efficiency is further improved.

When the present embodiment is used in the summer, etc., the forward flow three-way valve 51 and the return flow three-way valve 53 are rotated 90 degrees counterclockwise to set the straight passage state to set the heating system path. You should drive excluding 50.

〔The invention's effect〕

As described above, according to the present invention, a cooling / heating tower, a heat pump unit, and a water tank for both summer and winter are connected by a tower system circulation path and a water tank system circulation path, which are combined with conversion system paths, to form one system. Since the heat storage heat pump is configured as described above, it is possible to switch the flow path between brine and water very smoothly and simply by switching a plurality of three-way valves in the conversion system path, so that one machine can be used for both cooling and heating. It is possible to use it efficiently, and it is possible not only to enable the annual heat storage operation, which was not possible in a large building, but also to reduce the number of parts and the cost.

Further, in the present invention, since an integrated cooling / heating tower for both cooling and heating is used, there is an effect that a small space for a heat exchanger is sufficient.

If a water tank system circulation path is attached to the water tank system circulation path for heating in the winter, the water in the water tank for air conditioning will be heated directly by the condenser, further improving heating efficiency. The effect of being able to do is obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a summer use state according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing a winter use state similarly, and FIG. 3 is a winter use state according to another embodiment. FIG. 4 is a schematic configuration diagram of an air heat source heat pump in a conventional small building, FIG. 5 is a schematic configuration diagram illustrating a heating operation state of a conventional heating tower heat pump, and FIG. The figure is also a schematic configuration diagram showing a cooling operation state. 1 …… Cooling / heating tower 2 …… Heat pump unit 4 …… Condenser 5 …… Evaporator 6c …… Coils in water tank 10,10 ′ …… Tower system circulation path 11 …… Downcomer pipe 12 …… Water absorption pipe 15… … Outlet pipe 16 …… Upcomer pipe 20,20′20 ″ …… Water tank system circuit 22 …… Suction pipe 25 …… Outlet pipe 26 …… Reflux pipe 30 …… Conversion system line 31 …… First three-way valve 32 …… Second three-way valve 33 …… Third three-way valve 34 …… Fourth three-way valve 35 …… First connection pipe 36 …… Second connection pipe 37 …… Third connection pipe 38 …… Fourth connection pipe 50 …… Water in the water tank Direct heating system path 51 …… Outflow three-way valve 52 …… Outgoing pipe 53 …… Return three-way valve 54 …… Return water pipe w …… Water w ₆ …… Water in the water tank b …… Brine

Claims (2)

[Claims] 1. A heat storage heat pump in which a tower system circulation path from a cooling and heating tower having a cooling and heating function and a water tank system circulation path from a coil in a water tank are combined in a heat pump unit. In the middle of the piping of, the assembling of the conversion system path provided with a plurality of three-way valves having a connecting pipe connected to the piping of the other circulation path, and the two circulation paths communicating with the condenser and the evaporator of the heat pump unit, respectively. The heat storage heat pump characterized in that the combination of the above is configured to switch between the brine and water by switching the three-way valve for summer cooling and heating in winter. 2. The water tank system circulation path is provided with a water tank internal water direct heating system path for allowing water in the water tank to pass therethrough in parallel with the coil in the water tank in a switchable manner. The heat storage heat pump described.