JPH11241844A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correspond to a variety of requests for air conditioning by performing cooling operation due to an indirect system utilizing cold water, and performing air-conditioning operation due to a direct expansion system utilizing a refrigerant. SOLUTION: An indoor unit B is provided. The indoor unit B has a heat exchanger of a utilization side for circulating a refrigerant between the heat exchangers of the utilization and heat source sides. An enter unit D with a refrigerant coil 51 for circulating the refrigerant between the coil and the heat exchanger of the heat source side and a cooling-water coil 52, where cold water is supplied from the heat source water supply device, is provided. Then, the heat exchanger of the utilization side, the cold water coil 52, and the refrigerant coil 51 are at least switched to a first cooling operation state for cooling, the heat exchanger of the utilization side and the refrigerant coil 51 are switched to a second cooling operation state for cooling, the heat exchanger of the utilization side performs heating operation, and at the same time the cold-water coil 52 and the refrigerant coil 51 are switched to a heating-cooling operation state for heating and cooling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an air conditioner in which an air-conditioned space in a building is air-conditioned by another system.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Publication No. 5 (1993), the air-conditioned space inside the building is divided into a perimeter zone on the window side and an interior zone on the inner side, and a use-side heat exchanger that functions only as an evaporator is provided to cool the air-conditioning duct. On the other hand, the passage on the downstream side of the use side heat exchanger of the air conditioning duct is branched into a perimeter side passage communicating with the perimeter zone and an interior side passage communicating with the interior zone side, and a reheater is provided in the perimeter side passage. By providing the interior zone, cool air is mainly supplied to the interior zone, and the perimeter zone is configured to be able to supply cold air or hot air. It is a well-known technique to perform highly efficient air conditioning in consideration of the characteristics of the interior zone.

[0003]

By the way, especially in a building such as a building having a large volume, in the interior zone, there is a case where heat is generated by the OA equipment, and there is a case where a heating request hardly occurs. In such a case, even if a multi-type air conditioner having a heat pump type refrigerant circuit is installed in the interior zone, that is, even if a large number of electric expansion valves and use side heat exchangers are arranged, the equipment is fully utilized. However, there is a possibility that wasteful capital investment may be caused.

Therefore, as in the above-mentioned conventional air conditioner, the perimeter zone and the interior zone are connected by a common duct system, and only the temperature of the conditioned air to each zone is changed. An increase in running cost and an increase in running cost can be suppressed.

[0005] However, if the same duct system is used to cover the perimeter zone in which the room temperature changes greatly and the interior zone in which the room temperature changes relatively little and is stable on the high-temperature side, fine temperature control is lacking. There was regret. In addition, depending on the installation location and conditions, a heating request may be generated even in the interior zone, and the above-described conventional one cannot sufficiently cope with such various air conditioning requests, and depending on the conditions, the comfort of the air conditioning may be impaired. There was.

The present invention has been made in view of the above points, and performs an indirect cooling operation using cold water from a heat source water supply device and an air conditioning operation using a so-called direct expansion method having a refrigerant circuit. Thus, it is an object to be able to respond to various air conditioning requests.

Another object is to divide an air conditioning space into a perimeter zone and an interior zone, and to arrange a so-called direct expansion type air conditioner having a refrigerant circuit in the perimeter zone to cope with various temperature changes. A so-called indirect / direct expansion air conditioner using cold water is placed in the interior zone, and a part of the heat of the refrigerant circuit on the perimeter zone side can be used for air conditioning in the interior zone. It is an object of the present invention to perform highly efficient air conditioning in response to various air conditioning requirements of a zone and in consideration of characteristics of a temperature state of a perimeter zone and an interior zone.

Another object of the present invention is to perform so-called heat recovery in which cold heat discharged from the perimeter zone is applied to the interior zone under conditions where there is a heating request in the perimeter zone and a cooling request in the interior zone. Another object of the present invention is to significantly reduce power consumption.

[0009]

Means for Solving the Problems-Solution Means- Specifically, as shown in FIG. 1, a first solution means is to use a refrigerant circulating between the heat source side heat exchanger (6) and the heat source side heat exchanger (6). Cold water is supplied from a refrigerant coil (51) through which a refrigerant circulates between a unit (B) having a side heat exchanger (12) and the heat source side heat exchanger (6), and a heat source water supply device (W). (D) having a chilled water coil (52). The use-side heat exchanger (12) and the refrigerant coil (51) are configured to be individually switched to a cooling operation and a heating operation. In addition, the use side heat exchanger (12), the chilled water coil (52), and the refrigerant coil (51)
Are both in the first cooling operation state in which the cooling operation is performed, the second cooling operation state in which both the use side heat exchanger (12) and the refrigerant coil (51) perform the cooling operation, and the use side heat state. At the same time as the exchanger (12) performs the heating operation, the operation mode including the cooling / heating operation state in which the cooling water coil (52) and the refrigerant coil (51) perform the cooling operation can be changed.

A second solution is that in the first solution, the unit (B) including the use-side heat exchanger (12) is the indoor unit (B), and the refrigerant coil (5)
The unit (D) including 1) and the chilled water coil (52) is the central unit (D), and includes the outdoor unit (A) having the heat source side heat exchanger (6).

According to a third aspect, in the second aspect, the indoor unit (B) is configured to air-condition a perimeter zone (Zp) adjacent to the external space, and the central unit (D) Is the perimeter zone (Zp)
The interior zone (Zi) arranged inside is air-conditioned.

According to a fourth solution, in the second solution, the indoor unit (B) and the central unit (D) are provided on each floor of the building.

According to a fifth solution, in the second solution, the outdoor unit (A), the indoor unit (B), and the central unit (D) are provided on each floor of the building, respectively. A heat source water supply device (W) is installed at one predetermined location in a building.

According to a sixth aspect of the present invention, in the third aspect, an air conditioning load detecting means for detecting an air conditioning load in the interior zone (Zi);
During cooling operation i), the cooling water coil (5
2) A shortage of capacity detection means (105) for detecting a state of insufficient cooling capacity on the side, and an output of the capacity shortage detection means (105) during the cooling operation of the interior zone (Zi). Refrigerant coil capacity control means (1) for controlling the capacity of the refrigerant coil (51) so as to compensate for the lack of capacity.
01A).

According to a seventh aspect of the present invention, in the third aspect, an air conditioning load detecting means for detecting an air conditioning load in the interior zone (Zi);
heating operation amount detection means (106) for detecting the heating operation amount of the use side heat exchanger (12) arranged in p), and the heating operation amount detection means (106) during the cooling operation of the interior zone (Zi). (101B) which controls the cooling capacity of the refrigerant coil (51) to a capacity corresponding to the heating operation amount of the use side heat exchanger (12).
And the capacity of the chilled water coil (52) is reduced to the capacity obtained by subtracting the capacity of the refrigerant coil (51) controlled by the refrigerant coil capacity control means (101B) from the air conditioning load of the interior zone (Zi) detected by the air conditioning load detection means. Chilled water coil capacity control means (102B) for controlling the capacity.

An eighth aspect of the present invention is the liquid crystal display device according to the seventh aspect, wherein the insufficiency detecting means (105) detects an insufficiency of the cooling capacity of the chilled water coil (52) with respect to the cooling load of the interior zone (Zi). On the other hand, when the cooling operation of the interior zone (Zi) is performed, the refrigerant coil capacity control means (101B)
When 5) detects that the capacity of the chilled water coil (52) is insufficient, the capacity of the refrigerant coil (51) is controlled so as to compensate for the insufficient capacity of the chilled water coil (52).

According to a ninth solution, in the seventh solution, the refrigerant coil (51) and the chilled water coil (5) are provided.
2) means a refrigerant coil (5
1) is disposed on the upstream side and includes air temperature detecting means for detecting the temperature of the conditioned air downstream of the refrigerant coil (51) and upstream of the chilled water coil (52), while chilled water coil capacity detecting means (102B ) Is configured to control the capacity of the chilled water coil (52) based on the relationship between the air conditioning load of the interior zone (Zi) detected by the air conditioning load detecting means and the temperature of the conditioned air detected by the air temperature detecting means. ing.

In the first solution, the refrigerant circulates between the heat source side heat exchanger (6) and the use side heat exchanger (12) to perform the air conditioning operation, while the heat source side heat exchanger Exchanger (6) and refrigerant coil (5
1), the cold water is supplied from the heat source water supply device (W) to the cold water coil (52), and the air conditioning operation is performed by both the coolant coil (51) and the cold water coil (52). Done. At this time, the use side heat exchanger (12), the chilled water coil (52) and the refrigerant coil (51)
Are both in the first cooling operation state in which the cooling operation is performed, the second cooling operation state in which both the use side heat exchanger (12) and the refrigerant coil (51) perform the cooling operation, and the use side heat state. At the same time when the exchanger (12) performs the heating operation, the operation mode including the cooling / heating operation state in which the cooling water coil (52) and the refrigerant coil (51) perform the cooling operation is changed. This responds to various air conditioning requirements.

In the second solution, the indoor unit (B) circulates refrigerant between the use side heat exchanger (12) and the heat source side heat exchanger (6) of the outdoor unit (A). The central unit (D) circulates the refrigerant between the refrigerant coil (51) and the heat source side heat exchanger (6) of the outdoor unit (A), and performs the chilled water coil (5).
2) The cold water is supplied from the heat source water supply device (W) to perform the air conditioning operation.

In the third solution, the air conditioning operation is performed by the indoor unit (B) in the perimeter zone (Zp), which is in contact with the external space and generates a cooling load in summer and a heating load in winter. Air conditioning comfort is maintained. On the other hand, in the interior zone (Zi) where almost only the cooling load is generated even in winter, the cool air cooled by the chilled water coil (52) of the central unit (D) is supplied and the refrigerant circulating through the refrigerant coil (51) is supplied. Even heat is supplied.

Therefore, the refrigerant coil (51) and the chilled water coil (5) can be used according to the air conditioning requirement of the interior zone (Zi).
1), and when the capacity of the chilled water coil (51) is insufficient, the refrigerant coil (51)
And replenishment of cold energy through the respective zones (Zi, Z
Highly efficient air-conditioning corresponding to the different air-conditioning requirements of p) becomes possible.

According to the fourth and fifth solutions, the use side heat exchanger (12) of the indoor unit (B) provided on each floor of the building and the central unit provided on each floor of the building are provided. The building is air-conditioned by the refrigerant coil (51) and the cold water coil (52) of (D). This allows
Each floor responds to various air conditioning requirements.

In the sixth solution, even when the capacity of the chilled water coil (52) is insufficient due to a condition such as an insufficient amount of chilled water, the refrigerant coil capacity control means (101A).
As a result, the capacity of the refrigerant coil (51) is controlled so as to compensate for the shortage, so that the air conditioning comfort of the interior zone (Zi) is maintained even under the condition of a large cooling demand such as in summer.

In a seventh solution, the perimeter zone (Z) is controlled by the refrigerant coil capacity control means (101B).
Since the cooling heat discharged from the indoor air in the heating operation by the use side heat exchanger (12) of p) is collected by the refrigerant coil (51) and used for cooling the interior zone (Zi), the perimeter is used especially in winter. Under the condition that there is a heating request in the zone (Zp) and there is a cooling request in the interior zone (Zi), the power consumption is significantly reduced.

In the eighth solution, the operation of the sixth solution can be obtained simultaneously with the operation of the seventh solution, and the operation can be performed in accordance with various environmental conditions which change throughout the year. The comfort of air conditioning is maintained,
In addition, power consumption is reduced.

In the ninth solution means, while the cooling operation of the refrigerant coil (51) is performed by the refrigerant coil capacity control means (101B), the cooling capacity is directly detected by the air temperature detecting means. Therefore, the capacity control of the chilled water coil (52) by the chilled water coil capacity control means (102B) is performed particularly accurately.

[0027]

Therefore, according to the first and second solutions, the use side heat exchanger (12), the chilled water coil (52) and the refrigerant coil (51) all perform the cooling operation. First cooling operation state and use side heat exchanger (12)
The second cooling operation state in which both the cooling coil and the refrigerant coil (51) perform the cooling operation and the use-side heat exchanger (12) perform the heating operation, simultaneously with the cooling water coil (52) and the refrigerant coil (5).
Since 1) changes the operation mode including the cooling and heating operation state in which the cooling operation is performed, it is possible to reliably respond to various air conditioning requests in the air conditioning space.

[0028] In particular, the refrigerant between the unit (B) having the use-side heat exchanger (12) in which the refrigerant circulates between the heat-source-side heat exchanger (6) and the heat-source-side heat exchanger (6). And a unit (D) having a chilled water coil (52) to which chilled water is supplied from a heat source water supply device (W) and a refrigerant coil (51) through which air flows. Since it can be used together with the indirect air conditioning operation using cold water from the device (W), it is possible to respond to various air conditioning requests.

Furthermore, since the use side heat exchanger (12) and the refrigerant coil (51) can be individually switched between cooling and heating, the heating side of the use side heat exchanger (12) is used to perform the heating operation. When cooling is performed by using the heat exchanger, heat recovery can be performed by using the cold heat of the use-side heat exchanger (12) for cooling the refrigerant coil (51). As a result, power consumption can be reduced.

According to the third solution, the indoor unit (B) is arranged in the perimeter zone (Zp) and the central unit (D) is arranged in the interior zone (Zi). In (Zp), the air conditioning operation is performed by the indoor unit (B), while in the interior zone (Zi), the cooling capacity can be supplemented via the refrigerant coil (51) in accordance with the air conditioning request.
As a result, it is possible to eliminate the need for installing many use-side heat exchangers and expansion valves in the interior zone (Zi) while responding to the different air-conditioning requirements of each zone (Zp, Zi). Reduction can be achieved.

According to the fourth solution, the indoor unit (B) and the central unit (D) are provided on each floor of the building. According to the fifth solution, the outdoor unit (A) and the indoor unit are combined. The unit (B) and the central unit (D) are provided on each floor of the building, and at the same time, the heat source water supply device (W) is installed at one predetermined location in the building. Air conditioning that meets various air conditioning requirements.

According to the sixth solution, while detecting the air conditioning load in the interior zone (Zi), when the cooling capacity of the chilled water coil (52) for the cooling load is insufficient, the refrigerant coil (51) is used. Is controlled so as to match the shortage of the capacity of the chilled water coil (52), so that the air conditioning comfort of the interior zone (Zi) can be maintained and maintained even under the condition of a large cooling demand such as in summer. .

According to the seventh solution, the heating operation amount of the use side heat exchanger (12) in the perimeter zone (Zp) is detected, and the cooling operation in the interior zone (Zi) is performed.
The cooling capacity of the refrigerant coil (51) is set in the perimeter zone (Z
While controlling to the capacity corresponding to the heating operation amount of p), the capacity of the chilled water coil (52) is controlled to be the capacity obtained by subtracting the capacity of the refrigerant coil (51) from the air conditioning load of the interior zone (Zi). Therefore, under conditions where there is a heating request in the perimeter zone (Zp) such as in winter and a cooling request in the interior zone (Zi), the power consumption can be significantly reduced by the heat recovery operation.

According to the eighth solution, the shortage of the cooling capacity of the chilled water coil (52) with respect to the cooling load is detected, and the capacity of the refrigerant coil (51) is reduced during the cooling operation of the interior zone (Zi). Since the capacity is increased only by the capacity shortage, the effects of the seventh and sixth solutions are exhibited, so that the operation can be performed in response to various changing environmental conditions throughout the year. Thus, maintenance of air conditioning comfort and reduction of power consumption can be achieved.

According to the ninth solution, the refrigerant coil (51) and the chilled water coil (52) are connected to the air conditioning duct (E).
Are arranged in series from the upstream side in order, and each coil (51, 5
2) detecting the temperature of the cool air during the period, and based on the relationship between the temperature of the cool air and the air conditioning load of the interior zone (Zi),
Since the ability of the cold water coil (52) was controlled,
By detecting the capacity of the refrigerant coil (51) more directly, the accuracy of control can be improved.

[0036]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 shows the overall configuration of the air conditioner according to the present embodiment. FIG. 1 shows an air conditioner system on one floor.

In the building where the air conditioner is arranged, the air conditioning zone is divided into a perimeter zone (Zp) in contact with an external space and an interior zone (Zi) located inside the perimeter for each floor. ing. Also,
The air conditioner includes, for each floor, a first air conditioner (X) having a refrigerant circuit (14) for air conditioning the perimeter zone (Zp) and an air conditioner for supplying conditioned air to the interior zone (Zi). Second with air conditioning duct (E)
An air conditioner (Y) is provided.

In FIG. 1, a solid line (14) connecting each part indicates a refrigerant piping system, a broken line indicates an electric wiring system, and a solid line (53) indicates a cold water piping system. However, in FIG. 2, a broken line (14) indicates a refrigerant piping system, and a solid line (53) indicates a chilled water piping system.

First, the configuration of the first air conditioner (X) will be described. 3 to 5 show the refrigerant piping systems of the outdoor unit (A), the indoor unit (B), and the BS unit (C) of the first air conditioner (X), respectively.

As shown in FIG. 3, the outdoor unit (A) includes a first compressor (1a) whose operating frequency is variably adjusted by an inverter, a capillary tube (1g), an on-off valve (1f), and the like. The second compressor (1b), whose capacity is adjusted in a plurality of stages by an unloader, is connected to a check valve (1).
e) a variable capacity compressor (1) configured to be connected in parallel through the first and second compressors (1a, 1b) for separating oil in gas discharged from the first and second compressors (1a, 1b). , A second oil separator (4a, 4b), a first and a second heat source side heat exchanger (6a, 6b) that can function as a condenser and an evaporator, respectively, and the heat source side heat exchanger (6a, 6b) The two outdoor fans (F1, F1) attached to the heat source side heat exchangers (6a, 6b) regulate the flow rate of the refrigerant when the heat exchangers (6a, 6b) function as condensers, and regulate the refrigerant flow when the heat exchangers (6a, 6b) function as evaporators. The first to do
A second outdoor electric expansion valve (8a, 8b), a receiver (9) for storing liquefied refrigerant, and an accumulator (10) for removing liquid refrigerant in the suction refrigerant are provided as main devices. A refrigerant circuit (14) is configured by connecting the respective devices.

Here, each of the heat source side heat exchangers (6a, 6a)
b) and the outdoor electric expansion valves (8a, 8b) are respectively arranged in parallel in the refrigerant circuit (14) by branch pipes, and further, between each branch pipe and the discharge pipe and the suction pipe of the compressor (1). Are provided with first and second four-way switching valves (5a, 5b) for switching the refrigeration cycle. That is, by switching each of the four-way switching valves (5a, 5b) individually,
Each heat source side heat exchanger (6a, 6b) individually switches to a condenser and an evaporator, and follows a subtle change in the cooling / heating load on the indoor side. The dead port of each of the four-way switching valves (5a, 5b) is connected to a branch pipe of the heat source side heat exchanger (6a, 6b) via a capillary tube and a check valve.

Further, a discharge line (11a) is provided from the discharge pipe side of the compressor (1), and a suction line (11b) is provided from the suction pipe side, and the liquid of the use side heat exchangers (6a, 6b) is provided. Liquid lines (11c) extend from the merging pipe side of the branch pipe toward the indoor unit (B), respectively, and have a so-called three-pipe structure.

Incidentally, (11d) is a pressure equalizing bypass which connects the discharge pipe and the suction pipe via an on-off valve (SV3).
1e) is a heating overload control circuit connecting the discharge line (11a) and the receiver (9) via a capillary tube and an on-off valve (SV4), and (11f) is a liquid line (11).
c) a liquid injection bypass which connects the suction line (11b) to the suction line (11b) via a capillary tube and an on-off valve (SV5); and (31) heats the suction refrigerant by heat exchange with the high-pressure refrigerant in the liquid line (11c). Suction heat exchange provided, (32a, 32b) is the oil separator (4
a, 4b) is an oil return passage provided through a capillary tube from the suction side of the compressor (1a, 1b).

The air conditioner is provided with sensors and the like. (P1) is a high pressure sensor for detecting the high pressure side pressure, (P1)
2) is a low pressure sensor for detecting the low pressure side pressure, and (HPS) is a high pressure switch which operates when the discharge gas pressure rises excessively.

On the other hand, FIG. 4 shows the refrigerant piping system of the indoor unit (B) and the piping configuration of the conditioned air. The indoor unit (B) serves as an evaporator during the cooling operation and as a condenser during the heating operation. A side heat exchanger (12) and an indoor fan (12a), and an indoor electric expansion valve (12) that regulates a refrigerant flow rate during a heating cycle operation of the use side heat exchanger (12) and performs a throttling action of the refrigerant during a cooling cycle operation. 13) and are connected in series by use side pipes (15a, 15c).

FIG. 5 shows a structure of a BS unit (C) provided between the indoor unit (B) and the outdoor unit (A) through a refrigerant pipe. The BS unit (C) is an indoor unit (B). ), The connection of the gas pipe (15a) is alternately switched to a discharge line (11a) and a suction line (11b) extending from the outdoor unit (A). That is,
The liquid pipe (15c) side of the use side heat exchanger (12) is connected to the liquid line (11c), while the gas pipe (15a) side of the use side heat exchanger (12) has a check function. The switching between the discharge line (11a) and the suction line (11b) is alternately performed by the first and second on-off valves (SV1, SV2) having the above.

That is, when the first on-off valve (SV1) is opened, the high-pressure gas refrigerant is introduced from the discharge line (11a) into the use side heat exchanger (12), and the use side heat exchanger (1) is opened.
2) is a condenser, and when the second on-off valve (SV2) is opened, the use side heat exchanger (12) is connected to the suction line (11).
The refrigerant is sucked into b), and the use side heat exchanger (12) becomes an evaporator.

The BS unit (C) is provided with a bypass (21) connecting the liquid line (11c) and the suction line (11b) on the outlet side of the second on-off valve (SV2). . The bypass line (21) has a liquid line (1).
1c) Check valve (2) that allows refrigerant to flow only from the side
3), a capillary tube (24), and a heat exchanger (22) for exchanging heat between the refrigerant decompressed and evaporated in the capillary tube (24) and the liquid refrigerant are interposed in order from the liquid line (11c) side. ing. Further, the discharge line (11
c) upstream of the first on-off valve (SV1) and the second on-off valve (SV1).
2) The upstream side is connected by a pressure equalizing bypass passage (25) via a capillary tube (26).

Next, the configuration of the second air conditioner (Y) will be described. As shown in FIGS. 1 and 2, the second air conditioner (Y)
A central unit (D) for generating conditioned air
And an air conditioning duct (E) for supplying the conditioned air generated by the central unit (D) to the interior zone (Zi).

A blower fan (F3) for blowing conditioned air to the air-conditioning duct (E) is provided in a casing of the central unit (D), and a ventilation path of the blower fan (F3) is provided in the casing. Is formed. A refrigerant coil (51) connected to the refrigerant circuit (14) of the first air conditioner (X) via the above-described BS unit (C) by a refrigerant pipe, and a flow control valve (54) And a chilled water coil (52) connected to the heat source water supply device (W) by a water pipe (53) via the water pipe.

Further, the air conditioning duct (E) extends to the interior zone (Zi), and an air outlet for supplying conditioned air to each part of the interior zone (Zi) is opened at the tip thereof. That is, the central unit (D)
The return air and the outside air are sucked from the air suction port of the air conditioner, and the heat exchange between the return air and the outside air and the refrigerant or the water sucked by the refrigerant coil (51) or the chilled water coil (52) is performed to generate conditioned air. The interior zone (Z
Supply conditioned air to each part of p).

As described above, the refrigerant coil (51)
Are alternately connected to the discharge line (11a) or the suction line (11b) of the refrigerant circuit (14) by the BS unit (C), so that each usage-side heat exchanger ( Air conditioning and heating are individually switched from 12).

Although not shown in FIG. 1, a central electric expansion valve (EVd) having a function of adjusting the flow rate of the refrigerant and a function of expanding the refrigerant is provided on the liquid pipe side of the refrigerant coil (51). (See FIG. 6 described later).

In FIG. 1, (201) is a system controller provided in the central unit (D).
(203) is an outdoor control device, and (204) is an indoor control device.

FIG. 6 shows the configuration of a control system between the above-described control devices. In the system controller (201) of the central unit (D), (210) is a control command unit, and the control command unit (210) ) Includes a heating capacity determination circuit (211), a cooling capacity determination circuit (212), and a chilled water presence / absence determination circuit (2) for determining the presence / absence of chilled water in a water piping system.
13), a heat recovery heat quantity calculation circuit (214), a chilled water coil capacity determination circuit (215), a chilled water coil capacity control command circuit (216), and a refrigerant coil capacity control command circuit (21).
7) and an individual air conditioner operation amount calculation circuit (218).

(220) is the refrigerant coil (5)
A refrigerant coil control device for controlling the capacity of 1), wherein the refrigerant coil control device (220) includes a valve opening control device (22) for controlling the opening of the central electric expansion valve (EVd).
1) and the on-off valves (SV1, S1) of the BS unit (C).
And a switching controller (222) for switching between opening and closing of V2). Further, (230) is the cold water coil (5
This is a chilled water control valve opening control device that controls the opening of the flow control valve (54) on the 2) side.

On the other hand, in the indoor control unit (204) of the first air conditioner (X), (240) is a control command unit, and the control command unit (240) includes a heating capacity judgment circuit (241). , A cooling capacity determination circuit (242) and a use side heat exchange capacity control command circuit (243).
(250) is the system controller (20)
An individual air conditioner operation information communication device for communicating operation information of the use side heat exchanger (12) in the unit to the individual air conditioner operation amount calculation circuit (218) in 1), and (260) is the use side heat exchange And a use-side heat exchange control device (260) for controlling the opening of the indoor electric expansion valve (13). (261) and the on-off valve (SV
1, SV2) and a switching controller (262) for switching between opening and closing.

Next, the contents of control by the control system in the central unit (D) will be described with reference to the switching diagrams of FIGS. 11 to 14 and the flowcharts of FIGS.

First, in step ST1, the damper mode defining the control mode of the damper (not shown) of the air conditioning duct (E) is switched to the normal operation. In step ST2, the room temperature (dry bulb) of the interior zone (Zi) is changed. Temperature) DBra is compared with the set temperature SP. If DBra> SP-1, a cooling routine to be described later is executed, while DBra <S
If it is P-1, the following heating routine 1 is executed (see FIG. 11). However, the on / off switching in cooling and heating is performed as shown in FIG.

In the heating routine 1, in step ST3,
The damper mode is switched to the refrigerant operation, and step ST4
Then, the value of the set temperature SP of the interior zone (Zi) is transmitted to the refrigerant coil capacity control command circuit (217), and in step ST5, the operation of the refrigerant coil (51) is performed by the valve opening control device (221). Do. That is, step S
At T6, it is determined whether or not there is an OFF command. If there is an OFF command, the process proceeds to a stop routine of step ST7. If there is no OFF command, at step ST8, the set temperature SP is read to control the refrigerant coil capacity. Command circuit (21
The value of the set temperature SP is transmitted to 7). Then, in step ST9, it is determined whether or not the room temperature DBra is higher than the set temperature SP. The control in steps ST6 to ST8 is repeated until DBra> SP, while DBra> SP.
, The process proceeds to step ST10, where the refrigerant coil (5
After setting 1) in the thermo-off state, the above-mentioned step ST2 is performed.
Return to control.

On the other hand, in the determination in step ST2, the DB
If ra> SP, the process proceeds to the cooling routine 1 in step ST11 and subsequent steps. In step ST11, a thermo-off command is issued to the refrigerant coil capacity control command circuit (217), and in step ST12, the operation of the refrigerant coil (51) is performed. After starting, it is determined whether or not there is an OFF command in step ST13. If there is an OFF command, the process proceeds to step ST14 to execute a stop routine, while if there is no OFF command, the process proceeds to step ST15 to determine the presence or absence of cold water.

If the chilled water does not exist, a cooling routine 2 for cooling only the refrigerant described later is executed. If the chilled water is present, the control from step ST16 is performed. That is, step S
At T16, the room temperature DBra is compared with the set temperature SP, and if DBra> SP, the process proceeds to step ST17.
The thermostat of each indoor unit in the perimeter zone (Zp) is read, and in step ST18, the operation amount Kzi (i = 1 to m) of each indoor unit is calculated.
Then, the total heating operation amount ΣKzi is calculated.

Subsequently, in step ST20, a refrigerant coil operation amount equal to the total heating operation amount ΣKzi is calculated from the total heating operation amount ΣKzi to perform heat recovery, and a set temperature SP for controlling the capacity of the refrigerant coil (51) is calculated. At the same time, a command to cancel the thermo-off is issued to the refrigerant coil capacity control command circuit (217), and at the same time, the set temperature SP value for capacity control is transmitted to the control P plate (202). If it is determined in step ST16 that DBra <SP, the process proceeds to step ST22 to instruct the refrigerant coil capacity control command circuit (217) to perform thermo-off.

Next, in step ST23, the flow rate control valve (54) of the chilled water coil (52) is calculated by subtracting the operation amount of the refrigerant coil from the air conditioning load of the interior zone (Zi).
, And in step ST24, the flow control valve (54) is operated. In step ST25, it is determined whether the opening of the flow control valve (54) is 100% and DBra >> SP. If the determination result is YES, a refrigerant chasing cooling operation described later is performed. If the determination result is NO, the process proceeds to step ST26, where it is determined whether DBra <SP or not, and DBra <SP is determined.
Until <SP, control is returned to step ST13 to continue the cooling operation. If DBra <SP, control returns to step ST2 to determine which of the cooling and heating should be performed again.

However, here, DBra >> SP is a case where DBra> SP + 2 as shown in FIG. Here, DBra <SP is the case where DBra <SP-2, as shown in FIG.

If the result of the determination in step ST25 is NO, the process proceeds to step ST31,
The cooling chase cooling operation of the cooling routine 3 is performed. First,
In step ST31, the damper mode is switched to the refrigerant operation. In step ST32, the refrigerant coil capacity control command circuit (217) is instructed to release the thermo-off, and the process proceeds to the next step. Then, in step ST33, it is determined whether or not there is an OFF command. If there is an OFF command, the process proceeds to step ST34 to execute the stop routine. If there is no OFF command, the process proceeds to step ST35 to set the set temperature SP. The value is read, and SP is sent to the refrigerant coil capacity control command circuit (217).
Transmit values.

Thereafter, in step ST36, DBra <S
It is determined whether P is P and the opening of the flow control valve (54) is smaller than 70%, and while the determination result is NO, the control of the above steps SAT33 to SAT35 is repeated, while the determination result is Y
When ES is reached, the process proceeds to step ST37, in which a thermo-off command is issued to the refrigerant coil capacity control command circuit (217), and then the process proceeds to the control of step ST16.

On the other hand, when it is determined in step ST15 that there is no cold water, for example, when the heat source water supply device (W) is stopped due to overtime, the process proceeds to step ST41 to perform the refrigerant-only cooling operation. Do. That is, in steps ST41 to ST45, the refrigerant alone operation is performed while performing the same control as in steps ST31 to ST35.

Then, in step ST46, the presence or absence of cold water is determined. If there is no cold water, the process returns to the control of step ST43, and the cooling only operation of the refrigerant is continued. After instructing the control instruction circuit (217) to turn off the thermostat, the flow shifts to the control in step ST16.

By the above control, the interior zone (Z
Regarding the cooling operation i), when the cooling demand of the interior zone (Zi) can be sufficiently satisfied by the capacity of the cooling water coil (52), it is determined in step ST16 that:
Since the room temperature DBra becomes equal to or less than the set value SP, step ST
After the control of Step 22, control of Steps ST23 and ST24 is performed. During the control of the flow rate control valve (54), the cooling load increases, and if the determination result of Step ST25 is NO, Since the cooling capacity is insufficient, refrigerant chasing cooling is performed in step ST31 and subsequent steps in which the insufficient amount is supplemented by the refrigerant coil (51).

Based on the determination in step ST25, a capacity insufficiency detecting means (105) for detecting an insufficiency of the cooling capacity of the chilled water coil (52) is formed.
By the control of ST24, the chilled water coil capacity control means (102A) of the sixth solving means is constituted, and the control of step ST23 is performed.
The control to execute the steps from step 25 to step ST31 onward constitutes a sixth solution refrigerant coil capacity control means (101A).

On the other hand, when the perimeter zone (Zp) is heating and the interior zone (Zi) is cooling, DBra> SP is determined in step ST16, so that the first air conditioner is controlled by the control in steps ST17 to ST21. (X)
, The capacity of the refrigerant coil (51) is controlled to a capacity corresponding to the heating operation amount on the side of the perimeter zone (Zp). That is, heat recovery is performed in which the cold heat obtained by heat exchange with the indoor air in the perimeter zone (Zp) is recovered in the room in the interior zone (Zi). And this refrigerant coil (51)
The chilled water coil (52) controls so as to make up only the shortage of the capacity.

Further, in this state, the interior zone (Z
If the room temperature in i) does not sufficiently decrease, step ST2
The control is shifted to the control of 5 or less, and the capacity shortage is compensated by the refrigerant coil (51). This state corresponds particularly when the heating operation is performed on the perimeter zone (Zp) side but the heating load is small.

Under the control of steps ST17 to ST19, the heating operation amount detection means (106) of the seventh solution means
The refrigerant coil capacity control means (101) of the seventh solution means is controlled by the control of steps ST17 to ST21.
B) is constituted, and the chilled water coil capacity control means (1) of the seventh solution means is controlled by the control of steps ST23 and ST24.
02B).

Further, in particular, while performing the heat recovery operation, according to the determination result of step ST25, step S25 is performed.
By the control to perform the refrigerant chasing cooling operation of T31 or less,
Eighth Solution Means Refrigerant Coil Capacity Control Means (101B)
The cooling capacity replenishment function is configured.

Therefore, in the air conditioner of the above embodiment, various operation modes according to the state of the annual air conditioning load can be realized. FIG. 15 shows a change in season and a change in the cooling load and the heating load in the interior zone (Zi) (solid line portion) and the perimeter zone (Zp) (dashed line portion) corresponding thereto. As shown in the drawing, in the interior zone (Zi), the cooling load is almost all year round. However, although not shown in the figure, there may be a heating load at the start of winter or the like.

On the other hand, in the perimeter zone (Zp), the heating load is mainly in winter (November to April in the figure), and the cooling load is mainly in other seasons. Then, when the heating operation is performed in the perimeter zone (Zp), the heat recovery operation becomes possible (hatched portion in the figure), and the power consumption can be reduced.

FIG. 16 shows the interior zone (Zi) and perimeter zone (Zp) during a typical winter day.
In the interior zone (Zi), there is a cooling load all day except at the time of startup, and in the perimeter zone (Zp), there is a heating load. The obliquely hatched portion and the vertical hatched portion in the figure are formed by the cold heat obtained from the room by the heating by the use side heat exchanger (12) of the first air conditioner (X) and the refrigerant coil (51) of the central unit (D). The portion that is in balance with the heat recovery cooling is shown, and the dotting portion shows the heat quantity of the cooling by the cold water coil (52).

As can be seen from the figure, only the cooling load that cannot be covered by heat recovery is supplemented by the capacity of the chilled water coil (52). That is, it is understood that the effect of reducing power consumption by heat recovery is great.

FIG. 17 shows changes in the cooling load of the interior zone (Zi) and the perimeter zone (Zp) during a typical summer day. In the figure, diagonally hatched portions indicate cooling by the use-side heat exchanger (12), vertical hatched portions indicate cooling by the refrigerant coil (51), and dotting portions indicate cooling by the cold water coil (52). That is, in the interior zone (Zi), the cooling load is substantially satisfied only by the cold water, and in the meantime, in the perimeter zone (Zp), the cooling operation by the first air conditioner (X) is performed.

However, due to equipment management, the heat source water supply device (W) is stopped during overtime and the interior zone (Zi)
All cooling loads on the side are performed by utilizing the capacity of the refrigerant coil (51). That is, the cooling capacity is partially supplemented by utilizing the capacity of the refrigerant coil (51) only when the cooling load is large, and the comfort of the air conditioning can be maintained.

In the above embodiment, when heat recovery is performed, the first air conditioner (X) is provided with the refrigerant circuit (14) composed of three pipes.
The air conditioner (X) is not limited to such a configuration,
It is only necessary that the use side heat exchanger (12) on the perimeter zone (Zp) side and the refrigerant coil (51) of the central unit (D) are individually switched between cooling and heating by another switching means. However, when it is not always necessary to perform heat recovery, it is not necessary to be configured to be capable of individually switching between cooling and heating.

In the above embodiment, when heat recovery is performed, the capacity of the chilled water coil (52) is changed by the chilled water coil capacity control means (102B) from the air conditioning load of the interior zone (Zi) to the refrigerant coil (51). As a method of controlling the capacity to the reduced capacity, the interior zone (Z
The set temperature SP ′ for controlling the capacity of the refrigerant coil (51) is subtracted from the set temperature SP in i) to change the set temperature. However, the room temperature is corrected according to the capacity of the refrigerant coil (51). You may.

Although the embodiment is omitted, as in the ninth solving means, in the above-mentioned heat recovery operation, the temperature of the cool air at the outlet side of the refrigerant coil (51) is detected, and the flow to the chilled water coil (52) is detected. The capacity control of the chilled water coil (52) may be performed based on the relationship between the temperature of the suction air and the air conditioning load. In that case, there is an advantage that the accuracy of control is improved by more directly detecting the capacity of the refrigerant coil (51).

However, in the first to eighth solving means, the refrigerant coil (51) and the chilled water coil (52)
Does not necessarily have to be arranged in series in the central unit (D), and may be arranged in parallel with each other via a damper or the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration on one floor of an air conditioner according to an embodiment.

FIG. 2 is a diagram showing a configuration of the air-conditioning apparatus according to the embodiment in the whole building.

FIG. 3 is a refrigerant piping system diagram illustrating a configuration of an outdoor unit of a first air conditioner according to the embodiment.

FIG. 4 is a refrigerant piping system diagram showing a configuration of an indoor unit of the first air conditioner according to the embodiment.

FIG. 5 illustrates a first air conditioner or a second air conditioner B according to the embodiment;
It is a refrigerant | coolant piping system diagram which shows the structure of S unit.

FIG. 6 is a block diagram illustrating a configuration of a control system of each air conditioner according to the embodiment.

FIG. 7 is a flowchart illustrating control of a heating operation in an interior zone in the embodiment.

FIG. 8 is a flowchart illustrating the control of the heat recovery cooling operation in the interior zone in the embodiment.

FIG. 9 is a flowchart illustrating control of a refrigerant chasing cooling operation in an interior zone in the embodiment.

FIG. 10 is a flowchart showing the control contents of the refrigerant-only cooling operation in the interior zone in the embodiment.

FIG. 11 is a switching diagram showing a cooling / heating switching method in the embodiment.

FIG. 12 is a switching diagram showing a method for switching on and off during cooling and heating in the embodiment.

FIG. 13 is a switching diagram showing switching characteristics for performing a transition to the refrigerant chasing cooling operation and a return from the refrigerant chasing cooling operation in the embodiment.

FIG. 14 is a switching diagram showing switching characteristics for determining whether to continue the heat recovery operation or shift to the heating operation in the embodiment.

FIG. 15 is a diagram showing a change in an annual air conditioning load of an interior zone and a perimeter zone.

FIG. 16 is a diagram showing a change in an air conditioning load in an interior zone and a perimeter zone and a change in an operation mode of each air conditioner on a day in winter.

FIG. 17 is a diagram showing a change in the air conditioning load in the interior zone and the perimeter zone and a change in the operation mode of each air conditioner on a day in summer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Use side heat exchanger 13 Indoor electric expansion valve 14 Refrigerant circuit 51 Refrigerant coil 52 Chilled water coil 53 Chilled water piping 54 Flow control valve 101 Refrigerant coil capacity control means 102 Chilled water coil capacity control means A Outdoor unit B Indoor unit CBS unit D Center Unit E Air conditioning duct W Heat source water supply device X First air conditioner Y Second air conditioner Zi Interior zone Zp Perimeter zone

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Furuya 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries Inside Kanaoka Plant of Sakai Seisakusho Co., Ltd. (72) Keisuke Aoki 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. Inside the Sakai Plant Kanaoka Plant (72) Inventor Naoki Hashima 2-4-12 Nakazaki Nishi, Kita-ku, Osaka-shi, Osaka Umeda Center Building Daikin Industries, Ltd. (72) Inventor Tsuneo Morikami 2 Nakazaki-nishi, Kita-ku, Osaka, Osaka Chome 4-12 Umeda Center Building Daikin Industries, Ltd. (72) Inventor Masataka Shidozawa 2-4-12 Nakazaki Nishi, Kita-ku, Osaka-shi, Osaka Umeda Center Building Daikin Industries, Ltd.

Claims (9)

[Claims] 1. A unit (B) having a use-side heat exchanger (12) in which a refrigerant circulates between the heat-source-side heat exchanger (6) and the heat-source-side heat exchanger (6).
A unit (D) having a refrigerant coil (51) through which refrigerant circulates between the heat source side heat exchanger (6) and a chilled water coil (52) to which chilled water is supplied from a heat source water supply device (W). The usage-side heat exchanger (12) and the refrigerant coil (51) are configured to be individually switched to a cooling operation and a heating operation, and the usage-side heat exchanger (12) and the chilled water coil (52) are provided. And the first cooling operation state in which both the refrigerant coil (51) performs the cooling operation, and the second cooling operation state in which both the use-side heat exchanger (12) and the refrigerant coil (51) perform the cooling operation. The operation mode including the cooling / heating operation state in which the use-side heat exchanger (12) performs the heating operation and the cooling water coil (52) and the refrigerant coil (51) perform the cooling operation at the same time is configured to be possible. Air conditioner. 2. A unit (B) provided with a use side heat exchanger (12) is an indoor unit (B), and a unit (D) provided with a refrigerant coil (51) and a chilled water coil (52) is a central unit. The air conditioner according to claim 1, further comprising an outdoor unit (A) having (D) a heat source side heat exchanger (6). 3. The indoor unit (B) is configured to air-condition a perimeter zone (Zp) adjacent to an external space, and the central unit (D) is an interior disposed inside the perimeter zone (Zp). The air conditioner according to claim 2, wherein the air conditioner is configured to air-condition the zone (Zi). 4. The air conditioner according to claim 2, wherein the indoor unit (B) and the central unit (D) are provided on each floor of the building. 5. An outdoor unit (A) and an indoor unit (B)
The air conditioner according to claim 2, wherein the heat source water supply device (W) is installed at one predetermined location in the building, while the central unit (D) is provided on each floor of the building. 6. An air-conditioning load detecting means for detecting an air-conditioning load in the interior zone (Zi), and detecting an insufficient cooling capacity of the cooling water coil (52) with respect to the cooling load during a cooling operation of the interior zone (Zi). Capacity cooling means (105), and a cooling coil (51) which receives an output of the capacity cooling capacity detecting means (105) during the cooling operation of the interior zone (Zi) and compensates for the capacity shortage of the chilled water coil (52). 4. The air conditioner according to claim 3, further comprising a refrigerant coil capacity control means (101A) for controlling the capacity of (1). 7. An air-conditioning load detecting means for detecting an air-conditioning load in an interior zone (Zi), and a heating operation amount detecting for detecting a heating operation amount of a use side heat exchanger (12) arranged in a perimeter zone (Zp). Means (106) for receiving the output of the heating operation amount detecting means (106) during the cooling operation of the interior zone (Zi),
Refrigerant coil capacity control means (1) for controlling the cooling capacity of (1) to a capacity corresponding to the heating operation amount of the use side heat exchanger (12).
01B) and the interior zone (Z
i) The refrigerant coil capacity control means (10
The air conditioner according to claim 3, further comprising a chilled water coil capacity control means (102B) for controlling the capacity of the chilled water coil (52) to a capacity reduced by the capacity of the refrigerant coil (51) controlled by 1B). 8. An insufficiency detecting means (105) for detecting an insufficiency of the cooling capacity of the chilled water coil (52) with respect to a cooling load in the interior zone (Zi), while the refrigerant coil capacity control means (101B) comprises: During the cooling operation of the zone (Zi), the capacity shortage detecting means (1)
05) detects insufficient capacity of the chilled water coil (52),
The air conditioner according to claim 7, wherein the capacity of the refrigerant coil (51) is controlled so as to compensate for the shortage of the capacity of the chilled water coil (52). 9. A refrigerant coil (51) and a chilled water coil (52).
Means that the refrigerant coil (51) is arranged in series with the ventilation path and the upstream side, and the downstream side of the refrigerant coil (51) and the cold water coil (52).
Air temperature detection means for detecting the temperature of the conditioned air on the upstream side of the air conditioner, while the chilled water coil capacity detection means (102B) includes the air conditioning load of the interior zone (Zi) detected by the air conditioning load detection means and the air temperature detection means The air conditioner according to claim 7, wherein the capacity of the chilled water coil (52) is controlled based on a relationship with the temperature of the conditioned air detected by the controller.