JP2914096B2 - Air conditioner - Google Patents

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 conditioning space in a building is air-conditioned by another system.

[0002]

2. Description of the Related Art Conventionally, air conditioners include, for example,
As disclosed in JP-A-3-156225, an air-conditioned space inside a building is divided into a perimeter zone on the window side and an interior zone on the inside, and a use-side heat exchanger functioning only as an evaporator is provided. While allowing the cool air to flow through the air conditioning duct, the downstream passage of the use side heat exchanger in 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. Some have reheaters installed in the passages.

[0003] The air conditioner mainly supplies cool air to the interior zone while supplying cool or hot air to the perimeter zone, so that a single duct system can be used to provide the characteristics of the interior zone that has a large cooling requirement even in winter. In consideration of this, highly efficient air conditioning is performed.

[0004]

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 even in the interior zone, that is, a large number of electric expansion valves and
Even if the use side heat exchanger is arranged, the equipment is not fully utilized, and there is a possibility that wasteful capital investment may be caused.

Therefore, as in the above-described 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.

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.

Further, depending on the installation location and conditions, a heating request may be generated even in the interior zone, and the above-described conventional device cannot sufficiently cope with such various air conditioning requests, and depending on the conditions, the comfort of the air conditioning may be insufficient. There was a risk of being damaged.

The present invention has been made in view of the above points, and performs a cooling operation by an indirect method using cold water from a heat source water supply device and an air conditioning operation by 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 cooling heat exhausted from the perimeter zone is applied to the interior zone under conditions where there is a heating request in the perimeter zone and there is a cooling request in the interior zone. Another object of the present invention is to significantly reduce power consumption.

[0011]

In order to achieve the above-mentioned object, as shown in FIG. 1, a means taken by the invention according to claim 1 is an outdoor unit having a heat source side heat exchanger (6).
The refrigerant circulates between (A) and the heat source side heat exchanger (6).
Indoor unit having a ring-side use side heat exchanger (12)
(B). In addition, for supplying cold water
A heat source water supply device (W) and the heat source side heat exchanger (6);
Refrigerant circulates between and acts at least as an evaporator
Cooling from the refrigerant coil (51) and the heat source water supply device (W)
A central unit having a cold water coil (52) to which water is supplied;
(D).

The means adopted by the second aspect of the present invention is the same as the first aspect of the invention, except that the utilization side heat exchanger (12) is provided.
And the refrigerant coil (51) are individually operated for cooling and heating.
It is configured to switch to the state shown in FIG.

According to a third aspect of the present invention, in the first aspect of the present invention, the indoor unit (B) comprises:
Air conditioning the perimeter zone (Zp) adjacent to the external space
It is configured so that: In addition, the central unit
(D) is located inside the perimeter zone (Zp).
Configured to air-condition the interior zone (Zi)
Have been.

The measures taken by the invention described in claim 4 are as follows.
The invention according to any one of claims 1 to 3, wherein the indoor unit is used.
The knit (B) and the central unit (D) are located on each floor of the building.
Each has a configuration provided.

The measures taken by the invention according to claim 5 are as follows.
The outdoor unit according to any one of claims 1 to 3 ,
Knit (A), indoor unit (B), and central unit
(D) means each of the floors of the building,
The water supply device (W) is installed at one predetermined location in the building
Configuration.

The measures taken by the invention according to claim 6 are as follows.
In the invention according to claim 3 , the interior zone (Z
i) air-conditioning load detecting means for detecting the air-conditioning load.
You. Furthermore, during the cooling operation of the interior zone (Zi),
Insufficient cooling capacity of the chilled water coil (52) for chamber load
Equipped with insufficient capacity detecting means (105) for detecting the state
You. In addition, during the cooling operation of the interior zone (Zi),
In response to the output of the capacity shortage detection means (105),
Refrigerant coil (5) so as to compensate for the lack of
Refrigerant coil capacity control means (101) for controlling the capacity of 1)
A).

[0017] means for invention was devised in claim 7, the
In the invention according to claim 3, the interior zone (Z
i) air-conditioning load detecting means for detecting the air-conditioning load.
You. And, it is useful to be arranged in the perimeter zone (Zp).
Operation that detects the amount of heating operation of the utility side heat exchanger (12)
An amount detecting means (106) is provided. Furthermore, interior
The heating operation amount detecting means during the cooling operation of the zone (Zi).
Receiving the output of (106), the cooling capacity of the refrigerant coil (51)
The power is adjusted to the heating operation amount of the user-side heat exchanger (12).
Equipped with refrigerant coil capacity control means (101B) for controlling force
I have. In addition, the air conditioner load detecting means detects
From the air conditioning load of the interior zone (Zi)
The refrigerant coil (5) controlled by the capacity control means (101B)
The capacity of chilled water coil (52) is reduced to the capacity of 1)
Chilled water coil capacity control means (102B) for controlling
ing.

The means adopted by the invention described in claim 8 is the same as the invention described in claim 7, except that the interior zone (Z
Cooling capacity of cooling water coil (52) for cooling load of i)
Equipped with insufficient capacity detecting means (105) for detecting insufficient state
I have. On the other hand, refrigerant coil capacity control means (101B)
Is the above capacity during the cooling operation of the interior zone (Zi).
Insufficient detection means (105) is not capable of cooling water coil (52).
When a foot is detected, the capacity of the cold water coil (52) is insufficient.
For controlling the capacity of the refrigerant coil (51) to compensate for
And

The measures taken by the invention described in claim 9 are the above-mentioned means.
In the invention according to claim 7 , the refrigerant coil (51) is
The water coil (52) is connected in series with the ventilation path and
Coil (51) arranged upstream, and a refrigerant coil
Downstream of (51) and upstream of the cold water coil (52).
Air temperature detection means for detecting the temperature of the conditioned air is provided.
You. On the other hand, the chilled water coil capacity detecting means (102B)
Of the interior zone (Zi) detected by the adjusting load detecting means.
The air-conditioning load and the air-conditioning air detected by the air temperature
Controls the capacity of the chilled water coil (52) based on the relationship with temperature
Configuration.

-Operation- According to the above-mentioned invention specifying matter, in the first aspect of the present invention, the outdoor
Unit (A) heat source side heat exchanger (6) and indoor unit
The refrigerant circulates between the heat exchanger (12) and the heat exchanger (12) on the side (B).
Thus, the indoor unit (B) performs an air-conditioning operation. Also, inside
In the central unit (D), the outdoor unit (A)
Between the heat source side heat exchanger (6) and the refrigerant coil (51)
As the refrigerant circulates, cold water is supplied from the heat source water supply device (W).
Cold water is supplied to the coil (52), and the refrigerant coil (5
1) and the cold water coil (52) at least
Cooling operation is performed. This will meet various air conditioning requirements.
Respond.

According to the second aspect of the present invention, the use side heat
While performing the heating operation of the exchanger (12), the central unit
The cooling operation of the refrigerant coil (51) of (D) is performed,
Bunch simultaneous operation becomes possible, and the user side heat exchanger (12)
And the cold energy given to the refrigerant by the refrigerant coil (51).
Heat recovery to air is possible, and especially low power consumption
It becomes possible to reduce.

According to the third aspect of the present invention, an external space is provided.
Cooling load in summer and heating load in winter.
In the perimeter zone (Zp), the indoor unit (B)
Air-conditioning operation is performed to maintain air-conditioning comfort.
You. On the other hand, even in winter, cooling
The terrier zone (Zi) contains the cold water of the central unit (D)
The cold air cooled by the coil (52) is supplied.
Heat is also supplied from the refrigerant circulating through the refrigerant coil (51)
Is done.

Therefore, the interior zone (Zi)
The refrigerant coil (51) and the chilled water coil (5
1) Air-conditioning operation is possible, and chilled water coil
When the capacity of (51) is insufficient, the refrigerant coil (51)
And replenishment of cold energy through the respective zones (Zi, Z
Highly efficient air-conditioning that meets the different air-conditioning requirements of p) is possible
It works.

Further, according to the invention described in claims 4 and 5,
Is the use of the indoor unit (B) provided on each floor of the building
Side heat exchanger (12) and the central unit provided on each floor of the building
Knit (D) refrigerant coil (51) and cold water coil (5)
2) air conditioning the building. This allows each floor
To meet various air conditioning requirements.

Further, in the invention of claim 6, wherein, even when the cooling water is insufficient ability of cold water coil (52) with conditions such as insufficient refrigerant coil capacity control means (101
A), the refrigerant coil (5
Since the capability of 1) is controlled, the comfort of the air conditioning in the interior zone (Zi) is maintained even under the condition of a large cooling demand such as in summer.

Further, in the invention according to claim 7 , the cooling heat discharged from the indoor air by the heating operation by the use side heat exchanger (12) of the perimeter zone (Zp) is controlled by the refrigerant coil capacity control means (101B). Since it is collected by the coil (51) and used for cooling the interior zone (Zi), there is a demand for heating in the perimeter zone (Zp) and a requirement for cooling in the interior zone (Zi), particularly in winter. Power consumption will be greatly reduced.

[0027] In the invention according to claim 8 , the above-mentioned claim is provided.
Simultaneously with the action of the invention in claim 7, the effect of the invention of the claim 6 is obtained, throughout the year, operation corresponding to variously changing environmental conditions is carried out, the comfort of the air conditioner is maintained,
In addition, power consumption is reduced.

According to the ninth aspect of the present invention, the refrigerant coil (51) is controlled by the refrigerant coil capacity control means (101B).
Since the cooling capacity is directly detected by the air temperature detecting means while performing the heat recovery operation in the above, the control of the capacity of the chilled water coil (52) by the chilled water coil capacity control means (102B) is performed particularly accurately. become.

[0029]

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

FIG. 2 shows the overall configuration of the air conditioner according to the present embodiment. FIG. 1 shows a system of an air conditioner on one floor. In the building where the air conditioner is arranged, the air conditioning zone is divided for each floor into a perimeter zone (Zp) in contact with an external space and an interior zone (Zi) located inside the perimeter zone (Zi). Further, 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 the interior zone (Z).
a) a second air conditioner (Y) having an air conditioning duct (E) for supplying conditioned air to i).

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 chilled water piping system. However, in FIG. 2, the broken line (14) indicates the refrigerant piping system, and the solid line (53)
Indicates a cold water piping system.

First, the configuration of the first air conditioner (X) will be described. 3 to 5 show 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 via the first and second compressors (1a, 1b) for separating oil in gas discharged from the first and second compressors (1a, 1b). , Second oil separator (4a, 4b), first and second heat source side heat exchangers (6a, 6b) and heat source side heat exchangers (6a, 6b) that can function as condensers and evaporators, respectively. And two outdoor fans (F1, F1) attached to the heat source side heat exchangers (6
When a, 6b) becomes a condenser, adjust the refrigerant flow rate,
The first and second evaporators perform a throttling action of the refrigerant when they become evaporators.
The outdoor electric expansion valves (8a, 8b), a receiver (9) for storing the liquefied refrigerant, and an accumulator (10) for removing the liquid refrigerant in the suction refrigerant are provided as main devices. Are connected to each other to form a refrigerant circuit (14).

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.
Between each branch pipe and a discharge pipe and a suction pipe of the compressor (1), a first and second four-way switching valve (5) for switching a refrigeration cycle is provided.
a, 5b). That is, each of the four-way switching valves (5a, 5b) is individually switched, so that each heat-source-side heat exchanger (6a, 6b) is individually switched to a condenser or an evaporator, and the load on the indoor cooling / heating load is reduced. Follows subtle changes.
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.

[0035] The discharge line from the discharge pipe side of the compressor (1) (11a) are suction line from the suction pipe side (11b) is a liquid of each utilization side heat exchanger (6a, 6b) 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) has an evaporator for cooling operation and a condenser for heating operation. Heat exchanger (12) and indoor fan (1
2a) and an indoor electric expansion valve (13) that adjusts a refrigerant flow rate during a heating cycle operation of the use side heat exchanger (12) and performs a throttle function of the refrigerant during a cooling cycle operation,
They are connected in series by use side pipes (15a, 15c).

FIG. 5 shows the configuration of a BS unit (C) interposed between the indoor unit (B) and the refrigerant pipe from the outdoor unit (A). 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).
The upstream side of V2) 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 return air and the outside air are sucked from the air suction port of the central unit (D), and the heat exchange between the return air and the outside air sucked by the refrigerant coil (51) or the chilled water coil (52) and the refrigerant or water is performed. The conditioned air is generated and supplied to each part of the interior zone (Zi) via the air conditioning duct (E).

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). Further, although not shown in FIG. 1, a central electric expansion valve (EV) having a function of adjusting the refrigerant flow rate and a function of expanding the refrigerant is provided on the liquid pipe side of the refrigerant coil (51).
d) is interposed (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-mentioned 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).

Further, (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 determination 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 for defining the control mode of the damper (not shown) of the air conditioning duct (E) is switched to normal operation, and 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 there is no chilled water, a cooling routine 2 for cooling only the refrigerant described later is executed. If there is chilled water, 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 thermo step of each indoor unit in the perimeter zone (Zp) is read, and the operation amount Kzi (i = 1 to m) of each indoor unit is calculated in step ST18.
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 capacity control set temperature SP 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, at 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 and the opening degree of the flow control valve (54) are smaller than 70%, and while the determination result is NO, the control of the steps ST33 to ST35 is repeated, while the determination result is YE
When S 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).
The process proceeds to the control in 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, and the refrigerant-only cooling operation is performed. 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 operation alone 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).

According to the determination in step ST25, the billing
Referred to in the invention of claim 6, insufficient capacity detecting means for detecting the insufficiency of the cooling capacity of the chilled water coil (52) (105) is constructed and Ri by the control of step ST23～ST24, cold <br/> water coil The capacity control means (102A) is constituted, and the refrigerant coil capacity control means (101A) according to the invention of claim 6 is constituted by the control for executing steps from step ST23 to step ST25 to step ST31 and thereafter.

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 in the above 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.

[0066] The control of the step ST17～ST19, constructed the heating operation amount detecting means according to the invention of claim 7, wherein (106), the control of step ST17～ST21, refrigerant coils referred to in the invention of claim 7, wherein The capacity control means (101B) is constituted, and the control of steps ST23 and ST24 constitutes the chilled water coil capacity control means (102B) according to the invention of claims 7 and 9 .

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,
The refrigerant coil capacity control means (1 ) according to the invention of claim 8
01B) 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 the 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 there is no need for heat recovery servants Always need not be configured to be individually heating and cooling switching.

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 be reduced, 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.

[0076] Further, embodiments are omitted, as in the invention of claim 9, wherein, in the heat recovery operation described above, to detect the temperature of the cold air at the outlet side of the refrigerant coil (51), cold water coil (52) 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 aspects of the present invention, the refrigerant coil (51) and the chilled water coil (52) do not necessarily need to be arranged in series in the central unit (D). And may be arranged in parallel via.

[0078]

As described above, according to the first aspect of the present invention, the room in which the refrigerant circulates between the outdoor unit (A) and the outdoor unit (A).
Refrigerant between the unit (B) and the heat source side heat exchanger (6)
Coil (51) through which heat circulates and heat source water supply device
It has a cold water coil (52) to which cold water is supplied from (W)
Central expansion unit (D)
Operation of the indoor unit (B) and the heat source water supply device
Cooling operation by indirect method using cold water from storage (W)
Can be used together to meet various air conditioning requirements
can do.

According to the second aspect of the present invention, the room
Unit-side heat exchanger (12) and central unit
(D) The cooling and heating can be switched individually with the refrigerant coil (51)
Because of this, for example, in the use side heat exchanger (12)
Cooling with refrigerant coil (51) while performing heating operation
When, cold refrigerant coil of the use-side heat exchanger (12) (5
Heat recovery used for cooling in 1) can be performed. this
As a result, power consumption can be reduced.

According to the third aspect of the present invention, the room
Place the unit (B) in the perimeter zone (Zp),
Central unit (D) located in interior zone (Zi)
In the perimeter zone (Zp)
Performs the air conditioning operation by the indoor unit (B), while
In the interior zone (Zi), the refrigerant core
The cooling capacity can be replenished via the il (51)
You. As a result, different air conditioning in each zone (Zp, Zi).
While responding to the demands, the demand for interior zones (Zi)
It is not necessary to install many user-side heat exchangers and expansion valves.
And equipment cost can be reduced.

According to the fourth aspect of the present invention, the room
Unit (B) and central unit (D) on each floor of the building
According to the invention described in claim 5, the outdoor unit is provided.
(A), indoor unit (B), and central unit (D)
Is installed on each floor of the building, while the heat source water supply device (W) is
Because it was installed in one predetermined place of the object, the building
Each floor has an air-conditioning space
You can perform harmony.

According to the sixth aspect of the present invention, while detecting the air conditioning load of 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 detected. ) 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 a condition of a large cooling requirement such as in summer. it can.

According to the seventh aspect of the invention, the heating operation amount of the use side heat exchanger (12) in the perimeter zone (Zp) is detected, and the refrigerant coil ( While controlling the cooling capacity of 51) to a capacity corresponding to the heating operation amount of the perimeter zone (Zp),
The capacity of the chilled water coil (52) is
Since the control is performed so that the capacity of the refrigerant coil (51) is reduced from the air conditioning load of (i), the heating requirement in the perimeter zone (Zp) in the winter zone or the like is limited to the interior zone (Zp).
In the case of i), the power consumption can be significantly reduced by the heat recovery operation under the condition that the cooling is required.

[0084] Further, according to the invention of claim 8, detects the shortage of the cooling capacity of the chilled water coil (52) for cooling load during the cooling operation of the interior zone (Zi), the ability of the refrigerant coil (51) Is increased by the capacity shortage, so that the effects of the invention described in claim 7 and the effects of the invention described in claim 6 are exerted.
It is possible to perform an operation corresponding to variously changing environmental conditions, and it is possible to maintain comfort of air conditioning and reduce power consumption.

According to the ninth aspect of the present invention, the refrigerant coil (51) and the chilled water coil (52) are arranged in series in the air conditioning duct (E) in order from the upstream side, and each coil (5
1, 52), and the capacity of the cold water coil (52) is controlled based on the relationship between the temperature of the cool air and the air conditioning load of the interior zone (Zi). By directly detecting the capacity of the refrigerant coil (51), it is possible to improve control accuracy.

[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 Continued on the front page (72) Keisuke Aoki 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. Sakai Factory Kanaoka Plant (72) Inventor Naoki Hashima 2-4 Nakazaki-Nishi, Kita-ku, Osaka-shi, Osaka # 12 Umeda Center Building Daikin Industries Co., Ltd. (72) Inventor Tsuneo Morikami 2-4-2 Nakazaki Nishi, Kita-ku, Osaka City, Osaka Prefecture Umeda Center Building Daikin Industries Co., Ltd. (72) Inventor Masataka Shidozawa Osaka, Osaka 2-4-12 Nakazaki-nishi, Kita-ku, Umeda Center Building Daikin Industries, Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) F24F 11/02 F24F 3/00

Claims (9)

(57) [Claims] An outdoor unit having a heat source side heat exchanger (6).
The refrigerant circulates between the heat source (A) and the heat source side heat exchanger (6).
The refrigerant circulates between the indoor unit (B) having the side heat exchanger (12), the heat source water supply device (W) for supplying cold water, and the heat source side heat exchanger (6) to reduce the amount of refrigerant.
At least a refrigerant coil (51) acting as an evaporator;
Chilled water coil supplied with chilled water from heat source water supply device (W)
An air conditioner comprising: a central unit (D) having (52) . 2. The air conditioner according to claim 1, wherein the use side heat exchanger (12) and the refrigerant coil (51) are configured to individually switch between a cooling operation and a heating operation. An air conditioner characterized by being constructed. 3. The air conditioner according to claim 1, wherein the indoor unit (B) is a perimeter adjacent to the external space.
The central unit (D) is configured to air-condition the zone (Zp), wherein the central unit (D)
Air conditioning of the interior zone (Zi) arranged on the side of the unit
An air conditioner characterized by being configured as follows . 4. The air conditioner according to claim 1, wherein the indoor unit (B) and the central unit (D) are provided in a building.
An air conditioner provided on each floor . 5. The air conditioner according to claim 1, wherein the outdoor unit (A), the indoor unit (B), and the central unit.
(D) is provided at each floor of the building, while the heat source water supply device (W) is installed at one predetermined location of the building.
An air conditioner characterized by being performed . 6. An air conditioner according to claim 3 , wherein said air conditioner detects an air conditioning load of an interior zone (Zi).
Load detecting means for controlling the cooling load during the cooling operation of the interior zone (Zi);
Of insufficient cooling capacity of the chilled water coil (52)
Capacity shortage detecting means (105) for performing the capacity shortage detection during the cooling operation of the interior zone (Zi).
Receiving the output of the outlet means (105),
The capacity of the refrigerant coil (51) is adjusted to compensate for the lack of capacity.
And control means (101A) for controlling a refrigerant coil capacity.
An air conditioning apparatus, characterized in that are. 7. An air conditioner according to claim 3, wherein an air conditioning load for detecting an air conditioning load in the interior zone (Zi) is provided.
Load detecting means and a use side heat exchanger arranged in a perimeter zone (Zp)
(12) Heating operation amount detection means for detecting the heating operation amount
(106) and the heating operation during the cooling operation of the interior zone (Zi).
The output of the amount detection means (106) is received, and the refrigerant coil (5
The cooling capacity of 1) is used as the heating operation amount of the use side heat exchanger (12).
Coil capacity control means (1)
01B) and the interior zone (Z
i) The refrigerant coil capacity control means (10
1B) reduced the capacity of the refrigerant coil (51) controlled by
Chilled water coil controlling capacity of chilled water coil (52)
An air conditioner comprising: a capacity control unit (102B) . 8. The air conditioner according to claim 7, wherein the cooling water coil for the cooling load of the interior zone (Zi) is provided.
(52) Lack of capacity detection to detect the state of lack of cooling capacity
While the outlet means (105) is provided, while the refrigerant coil capacity control means (101B) is
During the cooling operation of the engine (Zi), the capacity shortage detecting means (1)
05) detects insufficient capacity of the chilled water coil (52),
Refrigerant so as to compensate for the shortage of the capacity of the cold water coil (52).
An air conditioner characterized by controlling the capacity of a coil (51) . 9. The air conditioner according to claim 7, wherein the refrigerant coil (51) and the chilled water coil (52) are provided in a ventilation path.
With the refrigerant coil (51) on the upstream side
A cooling water coil (52) disposed downstream of the refrigerant coil (51);
Temperature detecting means for detecting the temperature of the conditioned air upstream of
While the chilled water coil capacity detecting means (102B) detects the air conditioning load.
The air conditioning load of the interior zone (Zi) detected by the means
The relationship with the temperature of the conditioned air detected by the air temperature detecting means is described.
An air conditioner characterized by controlling the capacity of a chilled water coil (52) based on a relationship.