JPH09243110A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the construction of an air conditioning system by forming a third air flow passage which is communicated with an open air intake and or a return air opening, and branches without passing by way of a third heat exchanger and communicated with an exhaust air opening by way of a first heat exchanger. SOLUTION: The air, which is introduced from an open air intake OA and is supplied to a space intended for air conditioning, is introduced from a return air opening RA. A part of return air is fed to a first heat exchanger EX1 by way of a third air flow passage AF3 by driving an exhaust air fan EF where the air is heat-exchanged with a first heat medium (refrigerant). A first heat medium circulation line is operated in a specific mode (either heating or cooling mode), thereby feeding hot air or cooled air to a second heat medium circulation line (brine circuit) and heating or cooling the open air and or the return air flowing in a first air flow passage AF1 to a desired temperature by way of the third heat exchanger EX3 so as to feed a space intended for air conditioning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and in particular, it has a built-in heat pump unit using external air and / or return air as a heat source, and is capable of flexibly responding to an air conditioning load request for each individual air-conditioned space. Air conditioners.

[0002]

2. Description of the Related Art In recent years, the method of air-conditioning equipment for office buildings has changed from the central method to the individual decentralized method in response to increasing cooling load due to intelligent building functions and demand for comfortable office environment. It is changing. As an air conditioning facility for such an individual distributed building air conditioning system, an air heat source type air conditioner as disclosed in JP-A-7-198161 is known.

The air heat source type air conditioner has a heat pump circuit having a plurality of heat exchangers, an exhaust heat passage having a gas-liquid contact type heat exchanger, and a heat storage tank if necessary. The air conditioner system is a completely independent distributed air heat source type air conditioner system that uses only the air less than the outside air amount taken in to maintain the indoor air quality in the air-conditioned room as a heat source, and therefore does not require a heat source apparently.

With such a configuration, energy consumption is reduced by reducing heat transfer power, and high operating rate is realized by using inexpensive nighttime electricity, and further, the capacity of the heat source device and the capacity of electric power equipment are reduced. By doing so, it is possible to construct a system that is more advantageous in terms of initial cost, running cost, and life cycle cost than conventional equipment. Further, according to the above configuration, the air conditioner is provided with the temperature control function and the supply of the supply air at the appropriate temperature to the various air conditioning zones by adopting the plurality of heat exchangers. It is possible to maintain the required thermal environment in the individual air-conditioned space in a good condition, and therefore it is possible to perform individual control according to each individual air-conditioned space. It is possible and excellent in system maintainability, and despite various equipment conditions, refrigerant pipes and heat source water pipes are omitted, the amount of work on site construction is reduced, and simplification,
It is possible to standardize.

[0005]

However, there is a problem in that the structure of the air conditioning system is relatively complicated and therefore a relatively complicated control method must be adopted. That is, in the above air-conditioning system, the heat pump circuit is a multi-system and requires a dedicated control device, the heat storage tank coil is a direct expansion system, and the amount of refrigerant to be filled is increased, and further heat exchange with the supply air is performed. The air conditioner coil has a problem that the direct expansion heat exchanger and the water heat exchanger are arranged in series and control is duplicated. Therefore, there is a technical requirement to achieve the same or higher effect with a simpler configuration and control method. The present invention has been made in view of such a technical standpoint,
With a relatively simple structure, it is possible to flexibly respond to the various air conditioning requirements required in each individual air-conditioned space, and it is also advantageous in terms of initial cost, running cost, life cycle cost, and also for construction and building It is an object of the present invention to provide a new and improved air heat source type air conditioning system capable of achieving standardization of the equipment layout of the above.

[0006]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, in an air conditioner having a built-in heat pump unit using outside air and / or return air as a heat source: Outside air intake (OA)
A return air port (RA) for taking in return air from the room, an exhaust port (EA) for exhausting air to the outside, and an air supply port (SA) for supplying air to the air-conditioned space; exhaust air and first A gas-liquid contact type first heat exchanger (EX1) for exchanging heat with a heat medium;
A second heat exchanger (EX) for exchanging heat between the heat medium and the second heat medium.
2), a compressor (COM), and an expansion valve (EV), and at least a first heat medium circulation path capable of switching the circulation direction of the first heat medium by a switching valve means (QV); A third heat exchanger (E) for exchanging heat between the air and the second heat medium.
X3), second heat exchanger (EX2) and circulation pump (P1)
And a second heat medium circulation path at least composed of
From the return air port (RA) to the third heat exchanger (EX
3) via the first air flow path (AF) to the air supply port (SA)
1) communicates with the outside air intake (OA) and the third heat exchanger (E
X3) communicates with the outside air intake port (OA) and / or the return air port (RA) with the second air flow passage (AF2) that joins with the first air flow passage (AF1) on the upstream side of X3). A third air flow path (AF3) is formed, which is branched without passing through the heat exchanger (EX3) and communicates with the exhaust port (EA) through the first heat exchanger (EX1). Things will be provided.

According to a second aspect of the present invention, in an air conditioner having a built-in heat pump unit using outside air and / or return air as a heat source so as to be able to flexibly cope with simultaneous heating and cooling loads: An outside air intake (OA) that takes in outside air, a return air port (RA) that takes in return air from the room, an exhaust port (EA) that exhausts air to the outside, and a first
A first air supply port (SA1) for supplying air to the air-conditioned space of
Second air supply port (SA2) for supplying air to the second air-conditioned space
And; a gas-liquid contact type first heat exchanger (EX1) for exchanging heat between the exhaust air and the first heat medium, and a second heat exchange for exchanging heat between the first heat medium and the second heat medium. Unit (EX2) and compressor (CO
M) and an expansion valve (EV), and a first heat medium circulation path capable of switching the circulation direction of the first heat medium by a switching valve means (QV); supply air and second heat medium A third heat exchanger (EX3) for exchanging heat between the second heat exchanger (EX3), a second heat exchanger (EX2), and a second heat medium circulation path at least composed of a circulation pump (P1); A first air flow path (AF1) from the return air port (RA) to the first air supply port (SA1) via the third heat exchanger (EX3) and the third air communication port (OA) A second air channel (AF2) that joins with the first air channel (AF1) on the upstream side of the heat exchanger (EX3), the outside air intake port (OA), and / or
Alternatively, the third heat exchanger (EX
3) A third air flow path (AF3) that divides the flow without passing through the first heat exchanger and communicates with the exhaust port through the first heat exchanger, an outside air intake port (OA), and a second air supply port (SA2). A fourth air flow path (AF4) communicating with each other, and a fifth air flow path (AF5) communicating with the return air port (RA) and the second air supply port (SA2).
A sixth air passage (AF6) is formed that connects the first air inlet (SA1) and the second air inlet (SA2); the amount of air flowing through the fourth air passage (AF4), and / or Damper means (D1, D2, D3) for adjusting the amount of air flowing through the fifth air passage (AF6) and / or the amount of air flowing through the sixth air passage (AF6);
1, D2, D3) to operate the desired amount of outside air and / or the desired amount of return air and / or the desired amount of air passing through the third heat exchanger (EX3) to the second air supply port (SA2). What is provided is characterized in that it is configured to be sent to.

In the air conditioner constructed based on the first and second aspects, a heat storage tank (HB) is installed,
A heat exchange coil (EX4) connected in series with the third heat exchanger (EX3) in the second heat medium circulation path in the heat storage tank (HB).
It is also possible to adopt a configuration in which is provided.

Further, the circulation amount of the second heat medium in the third heat exchanger (EX3) and the heat exchange coil (EX4) of the air conditioner can be adjusted individually and independently. If the EX4) is configured to be selectively detourable, it is possible to cope with a wider variety of loads.

In the second heat medium circulation path of the air conditioner, the second heat exchanger (EX2) and the heat exchange coil (EX4) are sequentially connected in series downstream of the third heat exchanger (EX3). If configured to do so, a system with a higher coefficient of performance can be constructed.

If necessary, heating means (H1) for heating the heat storage water in the heat storage tank (HB) may be provided, or a second means may be provided.
Heating means (H that radiates heat to the second heat medium circulating in the heat medium circulation path)
2) Alternatively, a heating means (H3) for heating the exhaust air flowing through the third air flow path (AF3) may be provided.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A preferred embodiment of an air heat source type air conditioner configured according to the present invention will be described in detail. In the following description, components having the same functional configuration will be denoted by the same reference symbols, and redundant description will be omitted.

First, a first embodiment of an air heat source type air conditioner according to the present invention and a modification thereof will be described with reference to FIGS. FIG. 1 shows a basic configuration of an air-heat-source type air conditioner of a type having one air supply port SA. As shown in the figure, each component such as a heat pump circuit that constitutes the air-heat source type air conditioner is housed in a casing C having a predetermined shape selected according to the installation location. Further, in the casing C, an outside air intake port OA for taking in outside air, a return air port RA for taking in return air from the room, an exhaust port EA for exhausting air to the outside, and an air supply for supplying air to the air conditioning target space. Mouth SA is provided,
Casing C through a supply / exhaust facility such as a predetermined duct
It is possible to supply / exhaust predetermined air from an air flow path, which will be described later, formed therein.

Inside the casing C, there is provided a first heat medium circulation path (a heat pump circuit using a heat medium utilizing a gas-liquid phase change, such as a chlorofluorocarbon refrigerant or ammonia), which constitutes a heat pump circuit. Circuit)) and a second heat medium circulation path for forming conditioned air (a circuit that uses water or antifreeze as a heat medium, and may be hereinafter referred to as a "brine circuit"). , A spray water circulating path for supplying spray water to a gas-liquid contact type first heat exchanger EX1 (a circuit for cooling the spray water circulation path when the first heat exchanger EX1 acts as a condenser. Cooling water circuit "
It may be called. ) And are formed.

First, the first heat medium circulation passage (refrigerant circuit) constituting the heat pump circuit will be described. This first heat medium circulation passage is a first gas-liquid contact type which exchanges heat with exhaust air.
The heat exchanger EX1, the compressor COM, the four-way valve QV, and the second heat exchanger E for exchanging heat between the first heat medium and the second heat medium.
X2, the first expansion valve EV1, the second expansion valve EV2, and the liquid separator AC are connected by a pipe, and by switching the four-way valve QV, a predetermined refrigerant is circulated in a predetermined direction to circulate a predetermined refrigerant. It constitutes a heat pump circuit. The mechanical first expansion valve EV1 and the second expansion valve EV2 are provided with bypass paths in which the check valves V1 and V2 are inserted, and the expansion valves through which the refrigerant passes according to the circulation direction of the refrigerant. It is possible to choose. With this configuration, the first
In the heating medium circulation path, during heating operation, by switching the four-way valve QV, the refrigerant is transferred from the compressor COM → the four-way valve QV → the second heat exchanger (condenser) EX2 → the check valve 1 → the second expansion valve EV2 → First heat exchanger (evaporator) EX1 → four-way valve QV
By sequentially circulating → liquid separator AC → compressor COM, it is possible to supply heat to the brine circuit described later. On the other hand, during the cooling operation, by switching the four-way valve QV, the refrigerant is transferred from the compressor COM to the four-way valve Q.
V → first heat exchanger (condenser) EX1 → check valve 2 → first expansion valve EV1 → second heat exchanger (evaporator) EX2 → four-way valve QV → liquid separator AC → compressor COM in sequence As a result, cold heat can be supplied to the brine circuit described later.

Next, the second heat medium circulation path (brine circuit) will be described. The second heat medium circulation path is connected to the second heat exchanger EX2 for exchanging heat with the first heat medium (refrigerant). , A third heat exchanger EX3 for exchanging heat between the air and the second heat medium (brine), and a pump P1. And
Depending on the operation mode of the heat pump circuit, the second heat exchanger EX2 obtains hot or cold heat, and the third heat exchanger EX3 heats or cools the supply air.
Optimal temperature control can be performed.

Next, the structure of the spray water circulation path (cooling water circuit) and the gas-liquid contact type first heat exchanger EX1 will be described. The spray water circulation path is a spray pipe SP and a cooling water tank (lower part) for storing spray water. (Water tank) WB, pump P2, a pipeline for circulating cooling water, a strainer (not shown) attached to the pipeline, an eliminator for reducing the scattering of the spray water, and the amount of the sprayed and evaporated spray water. It is equipped with a water supply pipe. The first heat exchanger EX1 is, for example, an evaporative condenser, and sprays the latent heat of vaporization from the heat exchanger by sprinkling the first heat exchanger EX1 with water from the water sprinkling pipe SP, and the generated vapor is exhausted into the exhaust air. To achieve high-density heat transfer. The sprinkled cooling water is the cooling water tank WB.
Then, the water is pumped up by the cooling water circulation pump P2 and sprayed again from the water spray pipe SP to the first heat exchanger EX1. Of course, even if the cooling water is not sprinkled, it is not necessary to operate the spray water circulation path if sufficient heat exchange is performed.

Next, the air flow path formed in the casing C will be described. In the air conditioner according to the present embodiment, there are mainly three air flow paths AF1 and A in the casing C.
F2 and AF3 are formed. The first air flow path AF1 is an air flow path connecting the return air port RA and the air supply port SA, and on the way,
A filter F2 for removing dust in the air and a damper RD for adjusting the amount of air are inserted. The second air flow passage AF2 is an air flow passage that connects the outside air intake OA and the first air flow passage AF1, and on the way, a filter F1 for removing dust in the air and a damper for adjusting the amount of air. O
D is inserted. Further, the third air passage AF3 is
It is an air flow path that connects the exhaust port EA and the first air-air flow path AF1, but the third air flow path AF3 is closer to the return air port RA than the second air flow path AF2 that introduces the outside air. It communicates with the first air flow path AF1. And the exhaust port EA
An exhaust fan EF is provided in the vicinity, and an exhaust fan EF is provided in the vicinity of the air inlet SA.
Air supply fans SF are installed respectively.

Next, the operation of the air conditioner configured as described above will be briefly described. First, the outside air intake O
The air taken in from A and supplied to the air-conditioned space from the air supply port SA is taken into the casing C from the return air port RA. Then, according to the present air conditioner, by driving the exhaust fan EF, a part of the return air is sent to the first heat exchanger EX1 of the gas-liquid contact type through the third air passage AF3, and there, The heat is exchanged with the first heat medium (refrigerant). And
By driving the first heat medium circulation path (refrigerant circuit) in a predetermined mode (heating mode or cooling mode), warm heat or cold heat is supplied to the second heat medium circulation path (brine circuit),
The outside air and / or the return air flowing through the first air flow path AF1 is heated or cooled to a desired temperature by the third heat exchanger EX3 and supplied to the air-conditioned space. As described above, the heat pump mechanism of the present air conditioner uses the exhaust air substantially equal to or less than the taken-in outside air amount as a heat source. Do not use as Therefore, it is possible to construct a completely independent decentralized air heat source type air conditioner that apparently does not require a heat source. Further, since the heat medium circulating path is configured for each of the heat source and the air conditioning, for example, restrictions on the arrangement of the second heat exchanger EX2 are relaxed, and the degree of freedom of the device configuration is increased. Furthermore, since the first and second heat medium circulation devices can independently control the rotation speed of the pump, the well-known control method can be used to optimize responsiveness and energy saving from various operation modes. You can select a different operation mode.

FIG. 2 shows a first modification of the air conditioner shown in FIG. The basic configuration of the air conditioner shown in FIG. 2 is substantially the same as that of the air conditioner shown in FIG.
The air conditioner shown in FIG. 2 includes a heat storage tank HB, and the third heat exchanger EX of the second heat medium circulation path is provided in the heat storage tank HB.
A heat exchange coil EX4 connected in series with 3 is arranged. The heat storage tank coil, for example, when performing ice heat storage,
It is convenient to adopt an internal melting type in which ice is radiated around the outside of the coil and indirect defrosting is performed with the fluid flowing inside the coil. This is because the water in the tank is only natural convection and the tank structure is simple. In addition, by connecting in series, the configuration is simplified as compared with the arrangement of the heat exchanger of JP-A-7-198161. Valves V3 to V6 are interposed in the second heat medium circulation path, and a desired circulation path can be formed by appropriately opening and closing these valves V3 to V6. That is, when heat is stored in the heat storage tank HB using inexpensive power at night, the valves V3 and V6 are closed, the valves V4 and V5 are opened, and the heat exchange with the second heat exchanger EX2 is performed. The exchange coil EX4 is connected in series. On the other hand, when the heat stored in the heat storage tank HB is recovered, the valves V4 and V6 are closed and the valves V3 and V5 are opened, so that the second heat medium is transferred to the heat exchange coil EX4. → The second heat exchanger EX2 → the third heat exchanger EX3 are sequentially circulated. As described above, according to the configuration shown in FIG. 2, the heat stored in the heat storage tank HB can be recovered (taken out). Further, the compressor COM is operated, and the heat stored in the heat storage tank HB is recovered (taken out) while the second heat exchanger EX2 cools or heats the second heat medium.
In this case, the surplus heat generated by the heat pump circuit can be stored in the heat storage tank, and the compressor C
The operation can be performed without performing the OM capacity control operation. When there is no heat stored in the heat storage tank HB,
Alternatively, when it is not necessary to take out heat, the valve V4,
By closing V5 and opening the valves V3 and V6, the heat exchanger coil EX4 of the heat storage tank HB can be bypassed and the same operation as the configuration shown in FIG. 1 can be performed. Further, in the illustrated example, the heat storage tank HB is installed inside the casing C, but the heat storage tank HB and the heat exchange coil EX4 are provided.
Does not necessarily have to be installed integrally with another heat exchanger group. For example, a heat storage tank HB is installed adjacent to the air conditioner shown in FIG. 1 and is connected by an appropriate pipeline. You may. Further, if only the first and second heat medium circulation paths are provided in the machine and the machine is configured so as to be provided with a pipe outlet (tapping) for using the heat storage water, the heat storage tank HB
This will increase the degree of freedom in the installation position of the building, or it will be possible to use the existing water tank for the cooling enhancement work of the existing building.

FIG. 3 shows a partially modified example of the air conditioner shown in FIG. The difference between the air conditioner shown in FIG. 3 and the air conditioner shown in FIG. 2 is the circulation direction of the brine circulating in the second heat medium circulation path (brine circuit). of course,
As shown in FIG. 2, the brine is pumped P1 → second heat exchanger EX2 → third heat exchanger EX3 → heat exchange coil EX4.
→ The excellent effect of the present invention can be obtained even if it is sequentially circulated with the pump P1, but as shown in FIG. 3, the brine is pumped with the pump P1 → the heat exchange coil EX4 → the third heat exchanger E.
More efficient operation can be achieved by sequentially circulating X3 → second heat exchanger EX2 → pump P1. That is, according to such a configuration, the evaporation temperature or the condensation temperature of the first heat medium is the second temperature at the outlet of the third heat exchanger EX3.
It becomes close to the heat medium temperature, that is, the return air temperature, and the coefficient of performance of the first heat medium circuit can be increased. The pump P
1 can be provided between the 3rd heat exchanger EX3 and the 2nd heat exchanger EX2. With this configuration,
During the cooling operation, the second heat medium, which has absorbed the heat generated by the pump and has a high temperature, is supplied to the second heat exchanger, which enables efficient operation.

Further, FIG. 4 shows a modification in which some heating devices H1 to H3 are added to the configuration of the air conditioner shown in FIG. That is, in this modified example,
A heater H1 for heating water in the heat storage tank is installed in the heat storage tank HB, and a heater H2 for heating brine is installed in the second heat medium circulation path on the way. A heater H3 for heating exhaust air for a heat source is installed in the three-air channel AF3. With this configuration, when sufficient heat cannot be ensured, for example, in winter, the heaters H1 to H3 can heat a predetermined medium to improve the operation efficiency of the air conditioner. Especially, during the heating operation in winter, the heater H3 is
Since it is necessary to make the heat exchanger act as an evaporator, the spraying of sprayed water (gas-liquid contact function) is stopped, and the refrigerant vaporization that tends to be insufficient even in the outside air or in some cases the temperature-controlled exhaust from the room It is to supplement the heat for.

Next, some operation modes of the air conditioner with a heat storage tank according to FIGS. 2 to 4 will be briefly described.

(Cold Storage Mode) When cold heat is stored in the heat storage tank HB as ice or cold water, the second heat exchanger EX2 is used as an evaporator and the first heat medium circulation path is used as the first heat medium circulation path.
The heat exchanger EX1 is used as a condenser to radiate heat to the air flowing through the third air passage AF3. At this time, by circulating the cooling water and spraying the cooling water on the first heat exchanger EX1, it is possible to increase the heat radiation amount to the air.
Then, in the second heat medium circulation path, the second heat exchanger EX2
Thus, the cold heat from the first heat medium circulation path is received, and the cold heat is stored as ice or cold water in the heat storage tank via the heat exchange coil EX4.

(Hot water heat storage mode) When the heat is stored in the heat storage tank HB as hot water, the first heat exchanger EX1 is used as the evaporator in the first heat medium circulation path and the third air passage A is used.
The air flowing through F3 is allowed to cool and the second heat exchanger E
X2 is used as a condenser to radiate heat to the second heat medium. At this time, as in the device shown in FIG. 4, by operating the heater H3 provided in the third air passage AF3, it is possible to stably increase the cooling to the air. Then, in the second heat medium circulation path, the second heat exchanger E
By receiving the heat from the first heat medium circulation path by X2, the heat can be stored in the heat storage tank HB as hot water. At this time, as in the device shown in FIG. 4, the heater H2 arranged at an arbitrary position in the second heat medium circulation path is operated,
The heat storage amount can be increased by increasing the heat absorption amount of the second heat medium, or by operating the heater H1 arranged in the heat storage tank to further heat the heat storage tank water.

(Cooling operation mode) When a cooling load is required in the air-conditioned space, the cold heat is released from the heat storage tank HB to the second heat medium in the second heat medium circulation path, and the third heat exchange is performed. The air flowing through the first air flow path AF1 is cooled via the container EX3. In addition, if necessary, the heat pump circuit is operated, and the second heat exchanger EX is transferred from the first heat medium to the second heat medium.
The cold can also be released via 2. At this time,
The amount of heat radiated to the air may be increased by operating the spray water circulation path and spraying the cooling water to the first heat exchanger EX1.

(Heating operation mode) When a heating load is required in the air-conditioned space, the stored heat is released from the heat storage tank HB to the second heat medium in the second heat medium circulation path, and the third heat exchange is performed. The air flowing through the first air passage AF1 is heated via the container EX3. If necessary, the heat pump cycle may be operated to release the heat from the first heat medium to the second heat medium via the second heat exchanger EX2. At this time, as in the device shown in FIG. 4, by operating the heater H3 of the third air passage AF3, it is possible to increase the heat acquisition amount from the air. Further, the heater H2 arranged at an arbitrary position of the second heat medium circulation path is operated to increase the amount of heat released to the second heat medium, and further the heater H1 arranged in the heat storage tank is operated, It is also possible to increase the amount of heating of the air flowing through the first air passage AF1 by further heating the heat storage tank water.

Next, a second embodiment of the air heat source type air conditioner according to the present invention and a modification thereof will be described with reference to FIGS. The air conditioner according to the second embodiment is capable of coping with the case where different heat loads are required on the interior side and the perimeter side, for example, so that the first air supply opening SA1 and the second air supply opening SA2 are provided.
Except that the air flow path was changed accordingly.
The air conditioner according to the first embodiment described with reference to FIGS. 1 to 4 has the same configuration. Particularly, regarding the configurations of the first heat medium circulation passage, the second heat medium circulation passage, and the spray water circulation passage, the air conditioners according to the first and second embodiments have exactly the same constitution, and therefore are the same. Duplicated description will be omitted by attaching reference numerals. However, the configuration of FIG. 1 is shown in FIG. 5, the configuration of FIG. 2 is shown in FIG. 6, and the configuration of FIG. 3 is shown in FIG.
The configuration of FIG. 4 corresponds to that of FIG.

Also in the air conditioner shown in FIGS. 5 to 8,
Similar to the air conditioner shown in FIGS. 1 to 4, three air flow paths AF1, AF2, AF3 are formed in the casing C. The first air flow path AF1 is an air flow path that connects the return air port RA and the first air supply port SA1, and on the way, a filter F2 for removing dust in the air and a damper for adjusting the amount of air. RD is inserted. The second air flow path AF2 is
It is an air flow path that connects the outside air intake OA and the first air flow path AF1, and on the way, a filter F1 for removing dust in the air and a damper OD for adjusting the amount of air are inserted. Further, the third air flow passage AF3 is an air flow passage branched from the first air air flow passage AF1 to reach the exhaust port EA,
However, the third air passage AF3 is located at a position closer to the return air port RA than the second air passage AF2 for introducing the outside air.
It communicates with the air flow path AF1. In addition to these three air passages AF1, AF2, and AF3, in the present embodiment, fourth to sixth air passages AF4 to AF6 are further formed. The fourth air passage AF4 is connected to the second air supply port SA2.
And the second air flow path AF2 are communicated with each other.
A damper D1 for adjusting the amount of introduced air is inserted. The fifth air flow passage AF5 connects the first air flow passage AF1 and the fourth air flow passage AF4 on the upstream side of the third heat exchanger EX3, and a damper for adjusting the amount of introduced air on the way. D2 is inserted. Furthermore, the sixth air passage AF
6 is a first air flow path AF on the downstream side of the third heat exchanger EX3
The first air passage AF4 communicates with the first air passage AF4, and a damper D3 for adjusting the amount of introduced air is inserted midway. Further, the first and second air supply fans SF1 and S2 are provided near the first and second air supply ports SA1 and SA2, respectively.
F2 is provided. In accordance with the air conditioning load on the interior side, the fourth air flow path is used for outside air cooling in the winter and intermediate seasons, and the fifth air flow path is used for the ventilation operation in winter. The sixth air flow path is a flow path for guiding the air whose temperature has been adjusted by the third heat exchanger EX3.

With this structure, the first air supply port (perimeter side air supply port) is operated by operating the dampers D1 to D3.
SA1 and second air supply port (air supply port on interior side) SA2
In, even when different heat load is required,
The outside air, the return air, and the air conditioned by the third heat exchanger are mixed as desired and supplied to the second air supply port, so that it is possible to deal flexibly. For example, dampers D1 and D2
By opening, it is possible to introduce outside air or return air directly into the second air supply port SA2. Also, open the damper D3,
If the dampers D1 and D2 are closed, it is possible to deal with the case where the same type of load is required at the first and second air supply ports SA1 and SA2. If the damper D3 is closed, Conditioned air can be supplied only to the one air supply port SA1. The operation of these air flow paths and the dampers provided in the flow paths will be described below. To cover all interior zones with outside air cooling, open damper D1
2. Close D3. As a result, the outside air is guided by the blower SF2 via the fourth air passage AF4. When sending the same kind of air to the interior zone as the air supplied to the perimeter zone, only the damper D3 is opened and the dampers D1 and D2 are opened.
Is closed.

Several operation modes of the air conditioner with the heat storage tank HB shown in FIGS. 6 to 8 will be briefly described below. (Cold heat storage, cooling / cooling operation) Cold heat is stored,
When the cooling load is required at the first and second air supply ports SA1 and SA2, the circulating water circuit is operated and the first heat exchanger EX1 is operated as a condenser. Further, in the second heat medium circulation path, cold heat is extracted from the heat storage tank HB. At this time, the amount of liquid passing from the fourth heat exchanger EX4 is determined based on various parameters such as the difference between the cooling capacity of the compressor COMP that operates in rated operation and the indoor cooling load, the residual heat amount of the heat storage tank, and the like from the valve V3 V6 is automatically controlled, and the amount of bypass liquid passing through the valves V4 and V6 is determined. Then, the damper D3 is opened, the dampers D1 and D2 are closed, and the air cooled by the third heat exchanger EX3 is fed to the first
And the second air supply ports SA1 and SA2. Typically, it is a daytime operation mode in summer.

(Heat Heat Storage, Cooling / Cooling Operation) Heat is stored and the first and second air supply ports SA1 and SA2
In the case where a cooling load is required in the above, the point that the first heat medium circulation path is operated to cool the second heat medium is the same as described above, but the valves V3 to V6 are operated to bypass the heat storage tank HB. . That is, V5 is closed, V6 is fully opened, and the opening degrees of V3 and V4 are controlled according to the required load. Cooled air whose temperature is controlled is supplied from the first air supply port SA1 to the perimeter zone, the damper D3 is opened, D1 and D2 are closed, and the cooled air whose temperature is controlled is supplied to both the perimeter zone and the interior zone. It is typically a daytime operation in winter.

(Cold heat storage, cooling / heating operation) When cold heat is stored and a cooling / heating load is simultaneously requested, the valves V3 to V6 are operated as described above to bypass the heat storage tank HB. Then, the second heat medium is heated by operating the first heat medium circulation path. Then, the hot air is supplied to the first air supply port SA1 by the third heat exchanger EX3, and the outside air is introduced into the second air supply port SA2 via the fourth air flow path AF4 to save energy. It is possible to cope with the cooling load. Typically, office buildings equipped with a large number of OA devices, large-scale stores that generate a large amount of heat from the human body by attracting customers, and buildings with a high internal load, such as during the interim period, when the outdoor load fluctuates greatly. Operation mode.

(Heat Heat Storage, Cooling / Heating Operation) When the heat is stored and the cooling / heating load is requested at the same time, the first heat medium circulation path is operated to heat the second heat medium. This sprayed water is not circulated, but the first heat exchanger EX1 acting as an evaporator is heated by the heat of the air exhaust and the heat of the heater H3 in some cases. Then, heat is taken out from the heat storage tank HB. At this time, the opening of the valves V3 to V6 is controlled so as to compensate for the heating capacity of the first heat medium circulation path. If the valves V3 and V5 are not fully open even when fully opened, the heater H2 is operated. And the third heat exchanger EX
By supplying warm air through the first air supply port SA1 to the first air supply port SA1 and introducing outside air to the second air supply port SA2 as described above, it is possible to cope with a cooling load. Typically, this is a general operation mode in the winter and intermediate seasons in a building having a large internal load as described above.

(Cold heat storage, heating / heating operation) When cold heat is stored and a heating load is required for both the first and second air supply ports SA1 and SA2, the valves V3 to V6 are set to the above-mentioned values. In this way, the heat storage tank HB is bypassed, and the second heat medium is heated by the operation of the first heat medium circulation path.
Then, the air heated via the third heat exchanger EX3 is supplied to the first and second air supply ports SA1 and SA2 to cope with the heating load.

(Hot Heat Storage, Heating / Heating Operation) Hot heat is stored and the first and second air supply ports SA1 and SA2 are provided.
In the case where a heating load is required in the second heat medium circulation path, the valves V3 to V6 are controlled so as to cover the heat quantity required of each zone of the perimeter and the interior, and heat is taken out from the heat storage tank HB. Then, the air heated via the third heat exchanger EX3 is supplied to the first and second air supply ports SA1, SA2. It is typically an operation mode such as early morning in winter.

As suggested by the above description, when the heating devices (heaters) H1 to H3 are provided as shown in FIG. 8, the heat pump may lose its heating capacity against its cooling capacity. This can be supplemented, and various types of heat can be used beyond the range described above. Further, in the case of the device configuration shown in FIG. 5, since the heat storage tank HB is not connected, heating is performed only by operating the first heat medium circulation path without collecting cold heat or warm heat from the heat storage tank HB. When a simultaneous load for cooling and heating is required, which corresponds to the load or the cooling load, it is possible to cope by introducing the outside air. Further, according to the apparatus configuration shown in FIG. 7, the coefficient of performance of the first heat medium circulation path can be increased as described with reference to FIG.

FIG. 9 shows a specific arrangement example of the air system constituent elements of the apparatus according to the present invention. The fan SF1 for the perimeter is housed in the fan chamber SF1 ', and the fan SF2 for the interior is housed in the fan chamber SF2'. The intake air and return air are fan chamber SF
It is taken in for temperature control via the connecting casing CASE connected to 1 '. The damper D3 is for taking in this temperature-controlled air to the fan chamber SF2 ',
It is provided in the equipment casing partition. The damper D1 capable of supporting the outside air cooling is configured so that the fan chamber SF2 ′ side is opened during the outside air cooling. In order to take the return air into the fan chamber SF2 ', the damper D2 is similarly opened so that the fan chamber SF2' is opened. Further, in FIGS. 1 to 8, since two mechanical expansion valves are used, two expansion valves are provided for each.
In FIG. 9, one expansion valve EV is electronically adopted. In the figure, S is a strainer and T is a ball tap.

In the above description, the embodiment in which the indoor return air is used as the heat source has been described, but the present invention can be implemented using the outside air as the heat source. That is, in a zone where a large number of OA devices are installed, in a department store, a computer center, or the like, outside air has a lower temperature than return air in the case of cooling, for example. In that case, it is preferable to cool the condenser by spraying water with lower temperature outside air. At that time, a branch flow path can be taken out and introduced into the first heat exchanger EX1 from an air flow path from the outside air inlet to the third heat exchanger. This branch flow path may be upstream or downstream of the confluence of the outside air and the return air.

Although some embodiments of the air conditioner according to the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious to those skilled in the art that various changes and modifications can be conceived within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention is also applicable to them. Be understood to belong to. For example, as for the damper as well, a three-way damper may be provided at each confluence and branch point regardless of the position shown in the figure.

[0041]

As described above, according to the present invention,
By adopting the second heat medium circulation path, the device configuration and control of the first heat medium circulation path are simplified. For example, JP-A-7-1
In the conventional device described in Japanese Patent Publication No. 98161, a plurality of condensers are required for the evaporator, which is sufficient with one condenser, and the heat pump circuit is simplified. In addition, the heat storage tank H
The heat exchanger EX4 in B becomes the second heat medium system, and the amount of the first heat medium enclosed is reduced. Furthermore, the air conditioner coil for exchanging heat with the supply air has only one heat exchanger EX3, which simplifies the device configuration and control.

In addition, the heat storage tank may function as a thermal buffer that absorbs the difference between the air conditioning load and the cooling / heating capacity of the first heat medium circulation path, which simplifies the apparatus configuration and control. As described above, according to the present invention, the configuration of the first heat medium circulation path of the air conditioner is simplified, and the secondary side control (room temperature control, supply air temperature control) is facilitated, and the second heat exchange is performed. The degree of freedom in the device configuration increases, such as the fact that there is no control over the layout of the container EX2.

With such a relatively simple structure, it becomes possible to flexibly meet various air conditioning requirements required in each individual air-conditioned space, which is advantageous in terms of initial cost, running cost and life cycle cost. Further, there is provided a new and improved air heat source type air conditioner capable of achieving equipment standardization and standardization of equipment arrangement in a building.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a basic configuration of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a basic configuration of a modified example in which a heat storage tank is further provided in the air conditioner shown in FIG.

FIG. 3 is a configuration diagram showing a basic configuration of a modified example in which a circulation direction of a second heat medium circulation passage of the air conditioner shown in FIG. 2 is limited.

FIG. 4 is a configuration diagram showing a basic configuration of a modified example in which a heating device is further provided in the air conditioner shown in FIG.

FIG. 5 is a configuration diagram showing a basic configuration of an air conditioner according to a second embodiment of the present invention.

6 is a configuration diagram showing a basic configuration of a modified example in which a heat storage tank is further provided in the air conditioner shown in FIG.

7 is a configuration diagram showing a basic configuration of a modified example in which the circulation direction of the second heat medium circulation passage of the air conditioner shown in FIG. 6 is limited.

8 is a configuration diagram showing a basic configuration of a modified example in which a heating device is further provided in the air conditioner shown in FIG.

FIG. 9 is a configuration diagram showing an example of arrangement of components of the device according to the present invention.

[Explanation of symbols]

 C casing EX1 first heat exchanger EX2 second heat exchanger EX3 third heat exchanger COM compressor EV1, EV2 expansion valve P1, P2 circulation pump EF exhaust fan SF air supply fan OD outside air intake damper RD for return air Damper AF1 First air channel AF2 Second air channel AF3 Third air channel

Front page continuation (72) Inventor Masakazu Fujimoto 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Ebara Manufacturing Co., Ltd. (72) Inventor Hitoshi Saito 11-11 Haneda-Asahi-cho, Ota-ku, Tokyo Ebara Manufacturing Co., Ltd.

Claims (5)

[Claims] 1. In an air conditioner having a built-in heat pump unit using outside air and / or return air as a heat source: an outside air intake for taking in the outside air, a return air inlet for taking in the return air from the room, and an exhaust to the outside. An exhaust port, an air supply port for supplying air to the air-conditioned space; a gas-liquid contact type first heat exchanger for exchanging heat between the exhaust air and the first heat medium, the first heat medium, and the second heat medium. A first heat medium circulation path that is composed of at least a second heat exchanger that exchanges heat with the heat medium, a compressor, and an expansion valve, and that can switch the circulation direction of the first heat medium by a switching valve means. And a second heat medium circulation passage including at least a third heat exchanger for exchanging heat between the supply air and the second heat medium, the second heat exchanger, and a circulation pump; Inside the body, a first air flow from the return air port to the air supply port via the third heat exchanger. A passage, a second air passage communicating with the outside air intake and upstream of the third heat exchanger and joining the first air passage, and communicating with the outside air intake and / or the return air An air conditioner, characterized in that a third air flow path is formed that divides the flow without passing through the third heat exchanger and communicates with the exhaust port through the first heat exchanger. 2. In an air conditioner having a built-in heat pump unit that uses outside air and / or return air as a heat source: an outside air intake for taking in outside air, a return air inlet for taking in return air from the room, and exhausting to the outside. An exhaust port, a first air supply port for supplying air to the first air conditioning target space, and a second air supply port for supplying air to the second air conditioning target space; exhaust air and a first heat medium At least a gas-liquid contact type first heat exchanger for exchanging heat between the second heat exchanger, a second heat exchanger for exchanging heat between the first heat medium and the second heat medium, a compressor, and an expansion valve. A first heat medium circulation path capable of switching the circulation direction of the first heat medium by a switching valve means; a third heat exchanger for exchanging heat between supply air and the second heat medium, and A second heat medium circulation path including at least a second heat exchanger and a circulation pump; The first air flow path communicating from the return air port to the first air supply port via the third heat exchanger and the outside air intake port, and the first air on the upstream side of the third heat exchanger. A second air flow path that joins with the flow path, communicates with the outside air intake port and / or the return air port, and branches without passing through the third heat exchanger and the exhaust port through the first heat exchanger. A third air flow passage communicating with the second air supply port, a fourth air flow passage communicating with the outside air intake port and the second air supply port, and a fifth air communicating with the return air port and the second air supply port. A flow path and a sixth air flow path that connects the first air supply opening and the second air supply opening are formed; the amount of air flowing through the fourth air flow path, and / or the fifth air flow. A damper means for adjusting the amount of air flowing through the passage and / or the amount of air flowing through the sixth air flow path; operating the damper means. Air, which is configured to send a desired amount of outside air and / or a desired amount of return air and / or a desired amount of air that has passed through the third heat exchanger to the second air supply port. Harmony machine. 3. A heat storage tank is further provided, and a heat exchange coil connected in series with the third heat exchanger in the second heat medium circulation path is installed in the heat storage tank. The air conditioner according to claim 1 or 2. 4. The circulation amount of the second heat medium in the third heat exchanger and the heat exchange coil can be independently adjusted, and the heat exchange coil can be selectively bypassed. The air conditioner according to claim 3, wherein: 5. In the second heat medium circulation path, the third heat medium circulation path is provided.
The air conditioner according to claim 3 or 4, wherein the second heat exchanger and the heat exchange coil are sequentially connected in series on the downstream side of the heat exchanger.