JP2018096594A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system capable of properly performing both processing of a latent heat load by an outdoor unit and processing of a sensible heat load by an indoor air conditioner by supplying cold water to the outdoor unit and the indoor air conditioner respectively from a cold source, and capable of efficiently suppressing heat loss by cold water delivery to the indoor air conditioner.SOLUTION: An air conditioning system includes: an outdoor unit 1 for performing cooling and dehumidification of the outside air by heat exchange between supplied cold water R and the outside air and supplying it to the indoors; an indoor air conditioner 2 for cooling the indoor air by heat exchange between the supplied cold water R and the indoor air; and a cold water circulation supply part 4 which can circulate and supply the cold water R from a cold source 3 with respect to the outdoor unit 1 and the indoor air conditioner 2 in parallel. A mixing part 7 is provided in which one part of the return cold water R from the outdoor unit 1 is mixed with the outgoing cold water R to the indoor air conditioner 2 to raise the temperature of the outgoing cold water R.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning system that performs air conditioning in an air conditioning target area.

As this type of air conditioning system, as shown in Patent Document 1, an external air conditioner (sub air conditioner 3 in the literature) that cools and dehumidifies the outside air by heat exchange between the supplied cold water and the outside air and supplies the room indoors, Cooling water is circulated and supplied in parallel to the indoor air conditioner (main air conditioner 2 in the literature) that cools the indoor air by heat exchange between the supplied cold water and the indoor air, and the external air conditioner and the indoor air conditioner. There is known an air conditioning system including a free cold water circulation supply unit (see FIG. 1 of Patent Document 1).
This air conditioning system supplies low-temperature chilled water at a set temperature from a cooling source to each of the external air conditioner and the indoor air conditioner, so that the latent heat load is processed by the external air conditioner and the sensible heat load is processed by the indoor air conditioner. Can be sufficiently performed, and latent heat / sensible heat separation air conditioning can be appropriately realized.

Moreover, as shown in patent document 2, an external air conditioner (the air conditioner part which has the 1st coil 31 in literature), an indoor air conditioner (the air conditioner part which has the 2nd coil 32 in literature), and external adjustment There is also known an air conditioning system including a cold water circulation supply unit that can freely circulate and supply cold water from a cold heat source in series to an air conditioner and an indoor air conditioner (FIG. 2, FIG. 4, paragraph [0009] of Patent Document 2). , [0015] etc.).
This air conditioning system supplies low-temperature chilled water from a cold heat source to the external air conditioner, and supplies the entire amount of medium-temperature cold water discharged from the external air conditioner to the indoor air conditioner. However, the sensible heat load can be processed by the indoor air conditioner using the medium-temperature cold water discharged from the external air conditioner.

  Furthermore, in the air conditioning system described in Patent Document 2, pipes and valves for mixing low temperature cold water from a cold heat source with medium temperature cold water discharged from an external air conditioner and supplied to an indoor air conditioner (in the literature) Intermediate pipe 313 and second two-way valve 62) are provided, and the load processing degree of the indoor air conditioner can be adjusted in such a manner that the temperature of the medium-temperature cold water is lowered by mixing the low-temperature cold water.

JP 2011-058676 A JP2015-059692A

  By the way, it has been studied to increase the capacity of the external air conditioner and to process a part of the sensible heat load in addition to the latent heat load. In this way, the sensible heat load to be processed by the indoor air conditioner is reduced, and it becomes possible to reduce the amount of cold water for the indoor air conditioner, reduce the size of the piping, and the like.

  In this regard, the air conditioning system described in Patent Document 1 supplies low-temperature cold water having a set temperature from a cold heat source to each of the external air conditioner and the indoor air conditioner. When processing some sensible heat load in addition to the latent heat load with an external air conditioner, the temperature of the chilled water supplied to the indoor air conditioner with a small processing load with reduced sensible heat load to be processed becomes unnecessary. It becomes too low, and there is a problem that heat loss due to cold water feeding to the indoor air conditioner is large.

  Moreover, since the air conditioning system described in Patent Document 2 supplies low-temperature cold water from a cold heat source to the external air conditioner and supplies it to the indoor air conditioner of medium-temperature cold water discharged from the external air conditioner, as described above, When the capacity of the air conditioner is increased and some sensible heat loads in addition to the latent heat load are processed by the air conditioner, the temperature of the medium-temperature cold water discharged from the air conditioner becomes considerably high. Moreover, since cold water is supplied in series to the external air conditioner and the indoor air conditioner, the entire amount of medium-temperature cold water discharged from the external air conditioner is supplied to the indoor air conditioner. On the other hand, even if low temperature cold water is mixed to reduce the temperature, there is a limit to the range in which the temperature can be reduced. Therefore, the medium-temperature cold water supplied to the indoor air conditioner cannot be lowered to an appropriate temperature, and the sensible heat load may not be appropriately processed by the indoor air conditioner.

  In view of this situation, the main problem of the present invention is to supply cold water from a cold heat source to each of the external air conditioner and the indoor air conditioner, and process the latent heat load by the external air conditioner and the sensible heat load by the indoor air conditioner. It is in providing an air conditioning system capable of appropriately performing both and efficiently suppressing heat loss due to cold water supply to the indoor air conditioner.

The first characteristic configuration of the present invention is an external air conditioner that cools and dehumidifies the outside air by heat exchange between the supplied cold water and the outside air, and supplies the air to the room.
An indoor air conditioner that cools the indoor air by heat exchange between the supplied cold water and the indoor air;
A cold water circulation supply unit capable of circulating and supplying cold water from a cold heat source in parallel to the external air conditioner and the indoor air conditioner, and an air conditioning system comprising:
There exists a mixing part which mixes a part of return cold water from the said external air conditioner with the incoming cold water to the said indoor air conditioner, and raises the said outgoing cold water.

According to this configuration, by supplying the cold air from the cold heat source in parallel to the external air conditioner that cools and dehumidifies the outside air and supplies the indoor air to the indoor air conditioner that cools the indoor air and supplies the indoor air, Both the latent heat load processing by the external air conditioner and the sensible heat load processing by the indoor air conditioner can be appropriately performed.
Furthermore, it becomes possible to process some sensible heat loads in addition to the latent heat load in the external air conditioner. In this case, the sensible heat load to be processed by the indoor air conditioner is reduced, and the amount of cold water for the indoor air conditioner is reduced. Reduction, piping size town, and the like.
In addition, the cooling water from the external air conditioner is used to mix the cold water in the mixing section to raise the temperature of the outgoing cold water to the indoor air conditioner. Even when the sensible heat load is also processed, it is possible to efficiently suppress heat loss due to the cold water supply to the indoor air conditioner having a small processing load.
From these things, energy saving as the whole system can be realized effectively.

The second characteristic configuration of the present invention is a mixing rate adjusting unit capable of adjusting a mixing rate of cold water by the mixing unit,
And a control unit that controls the mixing ratio adjusting unit so that the temperature of the cold water going to the indoor air conditioner falls within a set temperature range.

According to this configuration, the temperature of the incoming cold water to the indoor air conditioner can be adjusted by adjusting the mixing rate of the cold water in the mixing unit by the mixing rate adjusting unit. And the temperature of the going cold water to an indoor air conditioner can be maintained in a preset temperature range by controlling a mixing ratio adjustment part by a control part.
Therefore, the temperature rise of the incoming cold water to the indoor air conditioner by mixing the cold water in the mixing unit suppresses the heat loss due to the cold water supply to the indoor air conditioner, and the variation in the temperature of the incoming cold water to the indoor air conditioner It can be avoided that the air conditioning temperature of the air conditioner becomes unstable.

A third characteristic configuration of the present invention includes a plurality of the indoor air conditioners,
The cold water circulation supply unit is configured to be capable of circulating and supplying cold water from a cold heat source in parallel to the plurality of indoor air conditioners,
The mixing unit is configured to mix a part of the return cold water from the external air conditioner with the cold water going to the plurality of indoor air conditioners.

According to this configuration, the sensible heat load in the room can be appropriately processed by the plurality of indoor air conditioners. And since some of the return chilled water from the external air conditioner is mixed with the chilled water going to the plurality of indoor air conditioners, the return chilled water from the external air conditioner is further utilized to make the outgoing chilled water to the multiple indoor air conditioners The temperature can be raised.
Therefore, when a part of the sensible heat load in addition to the latent heat load is processed in the external air conditioner, heat loss due to cold water supply to a plurality of indoor air conditioners can be efficiently suppressed, and further energy saving is achieved. Can be realized.

  The 4th characteristic structure of this invention exists in the point by which the said mixing part is arrange | positioned in the site | part close | similar to the said external air conditioner rather than the said some indoor air conditioner.

  In the cold water circulation supply unit, the pipe on the external air conditioner side tends to have a larger pipe size than the pipes on the side of the plurality of indoor air conditioners. According to this configuration, since the cold water mixing process is performed at a site close to the external air conditioner, it is easy to configure the pipe path on the side of the external air conditioner with a large pipe size, and the cold water circulation supply unit is efficiently configured. It becomes possible.

Conceptual diagram of air conditioning system

An embodiment of an air-conditioning system according to the present invention will be described with reference to the drawings.
FIG. 1 conceptually shows the configuration of an air conditioning system according to the present invention. As shown in FIG. 1, the air conditioning system includes an external air conditioner 1 that cools and dehumidifies the outside air and supplies the air to the room, a plurality of indoor air conditioners 2 that cool the room air, and a refrigeration as a cooling heat source. A chilled water circulation supply unit 4 that can freely circulate and supply cold water R from the refrigerator 3 to the external air conditioner 1 and the indoor air conditioner 2 in parallel, and a control device 10 that controls the air conditioning system (control) Part of an example). The air conditioning system is configured to perform processing of a latent heat load and a part of the sensible heat load in the external air conditioner 1, and perform processing of the remaining sensible heat load in the plurality of indoor air conditioners 2.

  The external air conditioner 1 includes, for example, an air handling unit including a heat exchanger, a blower, an air filter, and the like, and exchanges heat between the cold water R supplied by the cold water circulation supply unit 4 and the outside air. The outside air is cooled to a dew point temperature or lower to be dehumidified to a desired humidity, and low temperature dehumidified outside air is supplied into the room. The external conditioner 1 supplies the low-temperature dehumidified outside air to the room in this way, thereby performing the latent heat load process and a part of the sensible heat load process.

  The indoor air conditioner 2 includes, for example, a fan coil unit including a heat exchanger, a blower, and the like, and exchanges heat between the cold water R supplied by the cold water circulation supply unit 4 and the indoor air, thereby Is cooled to a desired temperature, and the cooling air is supplied into the room. The indoor air conditioner 2 processes the remaining sensible heat load by cooling the indoor air and supplying it to the room in this way.

  The refrigerator 3 is composed of, for example, a turbo chiller or an absorption chiller whose capacity can be adjusted by inverter control or the like, and cools the return chilled water R to a set temperature by differential pressure control or the like. Is generated. Moreover, the control apparatus 10 is comprised from the computer etc. which were provided with the communication part and the calculating part, for example, and controls the operating state of an air conditioning system by communication with each part of an air conditioning system.

  The chilled water circulation supply unit 4 includes a forward path 5 for supplying the forward cold water R generated by the refrigerator 3 to the external air conditioner 1 and the plurality of indoor air conditioners 2, and the external air conditioner 1 and the plurality of indoor air conditioners 2. A return path 6 for returning the return cold water R to the refrigerator 3 and a pump P are provided. By the discharge pressure of the pump P, the cold water R is circulated in parallel from the refrigerator 3 to the external air conditioner 1 and the indoor air conditioner 2. In addition to the supply, each of the plurality of indoor air conditioners 2 is also configured to circulate and supply cold water R from the refrigerator 3 in parallel.

  The forward path 5 of the chilled water circulation supply unit 4 includes, for example, a main forward path 5A connected to the refrigerator 3 and an external air conditioner outbound path 5B branched from the downstream side of the main forward path 5A and connected to the external air conditioner 1. The indoor air conditioner outbound path 5C branching from the downstream side of the main outbound path 5A toward the indoor air conditioner 2 side and the downstream of the indoor air conditioner outbound path 5C is branched and connected to each of the plurality of indoor air conditioners 2. In addition, a plurality of individual outbound paths 5D for indoor air conditioners are provided.

  In the return path 6 of the chilled water circulation supply unit 4, for example, an external air conditioner return path 6 </ b> A connected to the external air conditioner 1, and a plurality of indoor air conditioners connected to each of the multiple indoor air conditioners 2. A return path 6B, a return path 6C for indoor air conditioners where a plurality of individual return paths 6B for indoor air conditioners merge, a main return path 6D where a return path 6A for external air conditioners and a return path 6C for indoor air conditioners merge. The main return path 6 </ b> D is connected to the refrigerator 3.

The chilled water circulation supply unit 4 allows the chilled water R to flow in the order of the refrigerator 3, the main outbound path 5A, the external air conditioner outbound path 5B, the external air conditioner 1, the external air conditioner return path 6A, and the main return path 6D. Cold water R is circulated and supplied from the refrigerator 3 to the external air conditioner 1.
The chilled water circulation supply unit 4 includes a refrigerator 3, a main outbound path 5A, an indoor air conditioner outbound path 5C, each indoor air conditioner outbound path 5D, each indoor air conditioner 2, and each indoor air conditioner individual return path. The cold water R is circulated and supplied from the refrigerator 3 to the plurality of indoor air conditioners 2 by flowing the cold water R in the order of 6B, the return path 6C for the indoor air conditioner, and the main return path 6D.
In this way, the chilled water circulation supply unit 4 circulates and supplies the cold water R from the refrigerator 3 in parallel to the external air conditioner 1 and the indoor air conditioner 2 and refrigerates each of the plurality of indoor air conditioners 2. Cold water R is circulated and supplied from the machine 3 in parallel.

  In addition, a flow control valve V1 that controls the flow rate of the cold water R that is passed through the external air conditioner 1 according to the processing load of the external air conditioner 1 is provided in the external air conditioner return path 6A of the cold water circulation supply unit 4. Has been. In addition, in each of the indoor air conditioner individual return paths 6B of the chilled water circulation supply unit 4, the cold water R to be passed through the indoor air conditioner 2 according to the processing load of the indoor air conditioner 2 provided in the return path 6B. A flow rate control valve V2 for controlling the flow rate is interposed.

The air conditioning system includes a mixing unit 7 that mixes a part of the return cold water R from the external air conditioner 1 with the outgoing cold water R to the plurality of indoor air conditioners 2 and raises the temperature of the outgoing cold water R. ing.
In the present embodiment, the external air conditioner outgoing path 5B through which the return cold water R from the external air conditioner 1 flows to the cold water circulation supply unit 4 and the indoor air conditioner through which the outgoing cold water R to the plurality of indoor air conditioners 2 flows. A mixing path 8 for connecting the machine outbound path 5C is provided, and a mixing portion 7 is configured at a connection portion between the mixing path 8 and the indoor air conditioner outbound path 5C.

For example, when 5 ° C. cold water R is generated in the refrigerator 3, the temperature change of the cold water R in the circulation path to the external air compressor 1 (hereinafter, the temperature is indicated in parentheses) is the main forward path 5A (5 ° C. ) → Outward air conditioner outbound path 5B (5 ° C.) → External air conditioner 1 → External air conditioner return path 6A (15 ° C.) → Main return path 6D (17 ° C.).
On the other hand, the temperature change of the cold water R in the circulation path with respect to the plurality of indoor air conditioners 2 is caused by the temperature rise of the outgoing cold water R to the plurality of indoor air conditioners 2 by the mixing of the cold water R by the mixing unit 7. Main outbound path 5A (5 ° C.) → Upstream side of mixing section 7 in indoor air conditioner outbound path 5C (5 ° C.) → Downstream side of mixing section 7 in indoor air conditioner outbound path 5C (10 ° C.) → Individual outbound path for indoor air conditioner 5D (10 ° C.) → Multiple indoor air conditioners 2 → Individual return path 6B (20 ° C.) for indoor air conditioner → Return path 6C (20 ° C.) for indoor air conditioner → Main return path 6D (17 ° C.)
That is, the chilled water R to the plurality of indoor air conditioners 2, in other words, the chilled water R flowing on the downstream side of the mixing section 7 in the indoor air conditioner outbound path 5C and the individual indoor air conditioner outbound path 5D is refrigerated. The temperature (10 ° C.) is higher than the temperature (5 ° C.) of the cold water R generated by the machine 3 and flowing through the main forward path 5A. Of course, the specific temperature of the cold water R can be changed as appropriate.

  In this way, by using the return chilled water R from the external air conditioner 1 to raise the temperature of the outgoing chilled water R to the plurality of indoor air conditioners 2, heat loss due to chilled water feeding to the indoor air conditioner 2 with a small processing load Can be efficiently suppressed.

  The mixing unit 7 is disposed in a portion closer to the external air conditioner 1 than the plurality of indoor air conditioners 2. By doing in this way, the mixing process of cold water R can be performed in the site | part close | similar to the external air handler 1 in which the piping size tends to become large. Therefore, it is easy to configure the pipe path on the side of the external air conditioner 1 having a large pipe size, and the cold water circulation supply unit 4 can be configured efficiently.

  Although illustration is omitted, for example, the mixing path 8, the mixing portion 7 that is a connecting part between the mixing path 8 and the indoor air conditioner outgoing path 5C, and the connecting part between the mixing path 8 and the external air conditioner return path 6A Are arranged in the adjacent part of the external air conditioner 1, so that the mixing unit 7 is arranged in the adjacent part of the external air conditioner 1 as an example of the part closer to the external air conditioner 1 than the plurality of indoor air conditioners 2. Can do.

  The air conditioning system also includes a mixing ratio adjusting unit 9 that can adjust the mixing ratio of the cold water R by the mixing unit 7. By adjusting the mixing rate of the cold water R in the mixing unit 7 by the mixing rate adjusting unit 9, the temperature of the outgoing cold water R to the plurality of indoor air conditioners 2 can be adjusted.

The mixing ratio adjusting unit 9 is configured to adjust the mixing ratio of the cold water R by the mixing unit 7 by adjusting the flow rate of the cold water R that flows into the mixing path 8 from the external controller return path 6A. . The mixing ratio adjusting unit 9 can be configured, for example, by interposing a three-way valve 9a at a connection site between the external air conditioner return path 6A and the mixing path 8. In this case, the three-way valve 9a adjusts the ratio of the cold water R flowing into the mixing path 8 and the cold water R flowing downstream of the external air conditioner return path 6A, thereby adjusting the external air conditioner outbound path 5B. Thus, the flow rate of the cold water R flowing into the mixing path 8 can be adjusted, and the mixing ratio of the cold water R by the mixing unit 7 can be adjusted.
In addition, the mixing ratio adjusting unit 9 is configured by interposing a flow rate control valve in each of the mixing path 8 and the downstream portion of the connection section with the mixing path 8 in the external air conditioner return path 6A. You can also.

  The control device 10 is configured to control the mixing ratio adjusting unit 9 so that the temperature of the incoming cold water R to the plurality of indoor air conditioners 2 is within the set temperature range. For example, the control device 10 determines that the temperature of the cold water R flowing upstream of the indoor air conditioner outbound path 5C is 5 ° C. and the temperature of the return cold water R from the external air conditioner 1 that is raised by heat exchange in the external air conditioner 1 When the temperature is 15 ° C., the mixing ratio adjusting unit 9 is controlled so that the temperature of the outgoing cold water R to the plurality of indoor air conditioners 2 flowing downstream of the indoor air conditioner outgoing path 5C is within 10 ° C. .

  The control device 10 controls the mixing ratio adjusting unit 9 so that the temperature detected by the temperature sensor 11 provided on the downstream side of the mixing unit 7 of the indoor air conditioner outbound path 5C is within the set temperature range. The temperature of the outgoing cold water R to the plurality of indoor air conditioners 2 is adjusted within the set temperature range. Specifically, the control device 10 acquires the detected temperature of the temperature sensor 11 and calculates the mixing ratio of the cold water R based on the acquired detected cold water temperature and the set temperature range. And the control apparatus 10 outputs the control signal which controls the mixing ratio adjustment part 9 to the mixing ratio adjustment part 9 so that it may become the calculated mixing ratio, and controls the mixing ratio adjustment part 9.

  Thus, by controlling the mixing ratio adjusting unit 9 by the control device 10, the temperature of the outgoing cold water R to the plurality of indoor air conditioners 2 can be maintained within the set temperature range. Therefore, a plurality of indoor air conditioners are controlled while suppressing heat loss due to the cold water feeding to the plurality of indoor air conditioners 2 by increasing the temperature of the outgoing cold water R to the plurality of indoor air conditioners 2 by mixing the cold water R in the mixing unit 7. It is possible to prevent the air conditioning temperatures of the plurality of indoor air conditioners 2 from becoming unstable due to variations in the temperature of the cold water R going to the machine 2.

[Another embodiment]
(1) In the above-described embodiment, the case where there is one external air conditioner 1 is shown as an example, but a plurality of external air conditioners 1 may be provided. In that case, the cold water circulation supply unit 4 may be configured to be capable of circulating and supplying the cold water R from the cold heat source to the plurality of external air conditioners 1 in parallel. The number of indoor air conditioners 2 is not limited to a plurality and may be one.

  (2) In the above-described embodiment, the mixing unit 7 is configured to mix a part of the return cold water R from the external air conditioner 1 with the outgoing cold water R to the plurality of indoor air conditioners 2. Although the case has been shown as an example, for example, a part of the return cold water R from the external air conditioner 1 is mixed with the outgoing cold water R to some of the indoor air conditioners 2 among the plurality of indoor air conditioners 2. It may be configured as follows.

  (3) In the above-described embodiment, the control device 10 illustrates the case where the mixing ratio adjusting unit 9 is controlled so that the temperature of the incoming cold water R to the indoor air conditioner 2 is within the set temperature range. Such a control may be omitted, and a certain amount of the return cold water R from the external air conditioner 1 may be mixed with the return cold water R to the indoor air conditioner 2.

1 External air conditioner 2 Indoor air conditioner 3 Refrigerator (cooling heat source)
4 Chilled water circulation supply unit 7 Mixing unit 9 Mixing ratio adjusting unit 10 Control device (control unit)
R cold water

Claims (4)

An external air conditioner that cools and dehumidifies the outside air by heat exchange between the supplied cold water and the outside air and supplies it to the room;
An indoor air conditioner that cools the indoor air by heat exchange between the supplied cold water and the indoor air;
A cold water circulation supply unit capable of circulating and supplying cold water from a cold heat source in parallel to the external air conditioner and the indoor air conditioner, and an air conditioning system comprising:
An air conditioning system provided with a mixing unit that mixes a part of the return cold water from the external air conditioner with the incoming cold water to the indoor air conditioner to raise the temperature of the outgoing cold water. A mixing ratio adjusting unit capable of adjusting a mixing ratio of cold water by the mixing unit;
The air-conditioning system of Claim 1 provided with the control part which controls the said mixing ratio adjustment part so that the temperature of the going cold water to the said indoor air conditioner may be in a preset temperature range. A plurality of the indoor air conditioners are provided,
The cold water circulation supply unit is configured to be capable of circulating and supplying cold water from a cold heat source in parallel to the plurality of indoor air conditioners,
The air conditioning system according to claim 1 or 2, wherein the mixing unit is configured to mix a part of the return cold water from the external air conditioner with respect to the incoming cold water to the plurality of indoor air conditioners.   The air conditioning system according to claim 3, wherein the mixing unit is disposed in a portion closer to the external air conditioner than the plurality of indoor air conditioners.

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