JPH07103516A - Piping system for a plurality of heat source - Google Patents

Abstract

PURPOSE:To reduce the cost of a plumbing installation and facilitate the automatic control of air-conditioning/by a method wherein the number of heat source apparatus to be operated can be controlled by a simple piping system and the number of shut-off valves is decreased thereby. CONSTITUTION:A feed pipe-line 3 for each of heat source apparatus 1a to 1e is connected to feed pipe-connecting piping J41. One end of the feed pipe- connecting piping 41 is connected to a secondary feed pipe-line 23 for perimeter zones and the other end thereof is connected to a secondary feed pipe-line 27 for interior zones. A return pipe-line 5 for each of the heat source apparatus 1a to 1e is connected to return pipe-connecting piping 45. One end of the return pipe-connecting piping 45 is connected to a secondary return pipeline 25 for the perimeter zones and the other end thereof is connected to a secondary return pipe-line 29 for the interior zones. Shut-off valves 43a to 43a, 47a to 47d are respectively provided on the feed pipe-connecting piping 41 between the feed pipe-line 3 and on the return pipe-connecting piping 45 between the return pipe-lines 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping system for connecting a plurality of heat source devices serving as a cold heat source and a heat source, and more particularly to an arbitrary number of heat source devices corresponding to a heating and cooling load. The present invention relates to a piping system that enables operation in an operation mode.

[0002]

2. Description of the Related Art For example, an air-conditioned area such as an office building having a large window opening is divided into a perimeter zone which is easily affected by solar radiation and an interior zone which is easily affected by heat generation of office equipment. The perimeter zone and the interior zone may be required to be operated in separate cooling / heating modes (air conditioning modes). Therefore, it is preferable to allocate an appropriate number from a plurality of heat source devices according to the air conditioning mode and perform the number control in accordance with the load fluctuation. Fig. 6 shows an example of a piping system for performing this type of control, in which the forward piping and the return piping of each heat source device are integrated with a header, respectively, and these piping paths are appropriately switched to enable unit number control. It will be explained based on.

A package-type cold / hot water generator (cool / hot water generator) 1 which is a heat source device is provided with a forward path pipe 3 and a return path pipe 5, and the forward path pipe 3 and the return path pipe 5 send cold / hot water to a fan coil unit or the like. Supply circulation. The outward pipe 3 is branched into a perimeter forward pipe 7 and an interior forward pipe 9, the perimeter forward pipe 7 is connected to a perimeter forward pipe header 11, and the interior forward pipe 9 is connected to an interior forward pipe header 13. On the other hand, the return pipe 5 is the perimeter return pipe 1
5 and the interior return pipe 17, the perimeter return pipe 15 is connected to the perimeter return pipe header 19, and the interior return pipe 17 is connected to the interior return pipe header 21.
It is connected to the. Perimeter forward pipe 7, interior forward pipe 9, perimeter return pipe 15, interior return pipe 17
Open / close valves 7a, 9a, 15a, 17a are provided in the open / close valves, and the open / close valves 7a, 9a, 15a, 17a can open and close these pipes.

By the way, a plurality of chiller-heaters 1 (five in the illustrated example) are provided, and each of the perimeter forward pipe 7, interior forward pipe 9, perimeter return pipe 15 and interior return pipe 1 is provided.
Similarly, 7 is connected to the perimeter forward pipe header 11, the interior forward pipe header 13, the perimeter return pipe header 19, and the interior return pipe header 21. A secondary side perimeter forward pipe 23 and a secondary side perimeter return pipe 25 are connected to the perimeter forward pipe header 11 and the perimeter return pipe header 19. In addition, the interior forward pipe header 13 and the interior return pipe header 21 have secondary secondary interior forward pipes 2
7. The secondary side interior return pipe 29 is connected. Therefore, each chiller / heater 1 has a perimeter system,
Hot and cold water can be supplied to the interior system. In the figure, 31 is a circulation pump and 33 is a differential pressure regulating valve.

In the conventional piping system configured as described above, an appropriate number of water cooling / heating machines 1 can be switched in different operation modes in response to different air conditioning loads. That is, for example, when the water heater 1a is operated in the heating mode for the perimeter system, the on-off valves 9a and 17a of the water heater 1 are closed and the on-off valves 7a and 15a are opened, and the perimeter forward switch is opened. Hot water is discharged to the perimeter forward pipe header 11 via the pipe 7, and the hot water is supplied from the secondary side perimeter forward pipe 23 to the perimeter system. In the cooling mode, by the reverse operation,
Cold water will be supplied to the perimeter system. According to the above piping system, even when different air conditioning modes are required, an arbitrary number of chiller-heaters 1 can be allocated correspondingly, and the number of chiller-heaters 1 can be made to follow various load fluctuations. Control can be performed.

[0006]

However, in the above-described piping system, the outgoing pipe 3 and the return pipe 5 of each water heater 1 are provided with four perimeter forward pipes 7, interior forward pipes 9, and perimeter return pipes. 15 and the interior return pipe 17, and these pipes are further connected to the perimeter forward pipe header 11, the interior forward pipe header 13, the perimeter return pipe header 19, and the interior return pipe header 21. There is a drawback that it becomes complicated and the piping construction cost increases. Further, the number of on-off valves increases as the piping system becomes complicated, and many of these on-off valves 7a, 9a,
Since it is necessary to switch between 15a and 17a, there is also a problem that automatic control becomes extremely complicated. The present invention has been made in view of the above situation, and the number of valves can be controlled by a simple piping system, and the number of on-off valves can be reduced accordingly, so that the control can be easily performed. The purpose of the present invention is to provide a piping system for a plurality of heat sources, thereby reducing costs and facilitating automatic control.

[0007]

In order to achieve the above-mentioned object, a piping system for a plurality of heat sources according to the present invention is selected from a plurality of heat source devices provided with a forward pipe and a return pipe, depending on an air conditioning load. This is a piping system in which any number of units are connected to piping systems of different air-conditioning modes, and each heat source device's forward piping is connected to a forward connecting pipe, and one end of this forward connecting pipe is connected to the secondary perimeter forward pipe. And the other end is connected to the secondary side interior forward pipe, the return passage pipe of each heat source device is connected to the return passage connecting pipe, and one end of this return passage connecting pipe is connected to the secondary side perimeter return pipe. An end is connected to the secondary interior return pipe, and an on-off valve is arranged in each of the outward connection pipes between the outward pipes and the return passage connection pipes between the return pipes. .

[0008]

In the plurality of heat source devices, the forward connection pipe and the return connection pipe between the heat source devices that are in different air conditioning modes are closed by the open / close valve, and the arbitrary number of heat source devices are different from each other with the open / close valve as a boundary. It will be assigned to the air conditioning mode. As a result, there is no redundant piping in the piping for controlling the number of units,
Since the piping system is simple, the number of on-off valves for switching the piping path is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a piping system for a plurality of heat sources according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a system diagram of the piping system of the present invention. The same members as those shown in FIG. 6 are designated by the same reference numerals, and a duplicate description will be omitted. A plurality of package type cold and hot water generators (cool and hot water generators) 1a, 1b, 1c, 1d, 1 which are heat source devices
A forward passage pipe 3 and a return passage pipe 5 are provided at e, and the forward passage pipe 3 and the return passage pipe 5 circulate cold water or hot water to, for example, a fan coil unit.

A secondary side perimeter forward pipe 23 is connected to the forward pipe 3 of the chiller / heater 1a, and a forward connecting pipe 4 is provided.
One end of 1 is connected. The outward connection pipes 41 of the cooling and heating machines 1b, 1c, 1d, and 1e are connected to the outward connection pipes 41, and the other end of the outward connection pipes 41 is connected to the secondary-side interior outward pipe 27. In addition, each outward piping 3
The on-off valves 43a, 43b, 4
3c and 43d are provided, and the on-off valves 43a to 43d can open and close the outward connection pipe 41 at their respective positions.

On the other hand, a secondary side perimeter return pipe 25 is connected to the return pipe 5 of the chiller / heater 1a, and one end of a return passage connecting pipe 45 is connected. The return passage connection pipes 45 are connected to the return passage pipes 5 of the water heaters 1b, 1c, 1d, and 1e, respectively, and the other end of the return passage connection pipes 45 is connected to the secondary-side interior return pipe 29. Further, the return passage connecting pipes 45 between the respective return passage pipes 5 are provided with open / close valves 47a, 47.
b, 47c, 47d are provided, and the on-off valves 47a to 47d are provided.
The return passage connection pipe 45 can be opened and closed at each position. In the figure, 31 is a circulation pump, 33 is a differential pressure regulating valve, and 49 is a bypass valve (normally closed).

An example of actual control of the number of units in a heat source system in which a plurality of chiller-heaters are connected by such a piping system will be described with reference to FIGS. FIG. 2 is an explanatory view of the all-units cooling mode, FIG. 3 is an explanatory view of three cooling units and two heating units, FIG. 4 is an explanatory diagram of two cooling units and three heating units, and FIG.
It is explanatory drawing at the time of four table heating. As shown in FIG. 2, in the summer season such as May to September, the on-off valves 43a to 43d and the on-off valves 47a to 47 are in the all-unit cooling mode.
d is all opened, and the forward and backward piping 3 and the return piping 5 of the hot and cold water heater
Are connected in parallel by a forward connection pipe 41 and a return connection pipe 45, respectively. By performing the cooling operation of the hot / cold water machines 1a to 1e in this state, cold water is supplied to the secondary side perimeter forward pipe 23 and the secondary side interior forward pipe 27.

On the other hand, as shown in FIG. 3, April, October,
In an intermediate period such as November, the perimeter system may be operated in the heating mode and the interior system may be operated in the cooling mode. In this case, for example, when the two water heaters 1a and 1b are set to the heating operation mode and the three water heaters 1c, 1d, and 1e are set to the cooling operation mode, the on-off valve 43b and the on-off valve 47b are closed,
Other on-off valves 43a, 43c, 43d and on-off valves 47a, 4
7c and 47d are opened. Thereby, the hot and cold water machine 1a,
The hot water of 1b is supplied to the secondary side perimeter forward pipe 23, and the cold water of the cold / hot water machines 1c, 1d, and 1e is supplied to the secondary interior forward pipe 27.

Further, as shown in FIG. 4, in the winter months such as March and December, the perimeter system is operated in heating and the interior system is operated in the cooling mode, and the hot and cold water machines 1a, 1b,
When the three units 1c are set to the heating operation mode and the two units 1d and 1e are set to the cooling operation mode, the on-off valve 43c and the on-off valve 47c are closed, and the other on-off valves 43a, 43b, 43d and the on-off valve 4
7a, 47b and 47d are opened. As a result, the hot water of the cold / hot water generators 1a, 1b, 1c is transferred to the secondary side perimeter forward pipe 23.
At the same time, the cold water of the cold / hot water generators 1d and 1e is supplied to the secondary-side interior outward pipe 27.

Further, as shown in FIG. 5, in the winter season such as January and February, the perimeter system is operated in the heating mode and the interior system is operated in the cooling mode.
When 4 units of c and 1d are in the heating operation mode and 1 unit of 1e is in the cooling operation mode, the on-off valve 43d and the on-off valve 47d are closed, and the other on-off valves 43a, 43b, 43c and the on-off valve 47.
a, 47b, 47c are opened. As a result, the hot water of the cold / hot water machines 1a, 1b, 1c, 1d is supplied to the secondary side perimeter forward pipe 23, and the cold water of the cold / hot water machine 1e is supplied to the secondary side interior forward pipe 27. Of.

As can be seen from the control example described above,
In the piping system according to the present embodiment, by closing the forward connection pipe 41 and the return connection pipe 45 between the hot and cold water machines 1 which are in different air conditioning modes among a plurality of hot and cold water machines 1 by a set of on-off valves. , Any number of units will be assigned to different air conditioning modes. Therefore, the piping for controlling the number of units becomes extremely simple, and the on-off valve control for switching the piping paths becomes extremely easy.

[0017]

As described in detail above, according to the piping system of a plurality of heat sources according to the present invention, it is possible to allocate an arbitrary number of heat source devices to different air conditioning modes without making overlapping piping connections. Therefore, the piping system can be simplified and the number of opening / closing valves for switching the piping path can be reduced. As a result, the cost of piping work can be significantly reduced, and automatic control can be performed extremely easily.

[Brief description of drawings]

FIG. 1 is a system diagram of a piping system of the present invention.

FIG. 2 is an explanatory diagram of an all-units cooling mode.

FIG. 3 is an explanatory diagram when three cooling units and two heating units are used.

FIG. 4 is an explanatory diagram when two cooling units and three heating units are used.

FIG. 5 is an explanatory diagram with one cooling unit and four heating units.

FIG. 6 is a system diagram of a conventional piping system.

[Explanation of symbols]

 1 Heat Source Device 3 Forward Pipe 5 Return Pipe 23 Secondary Perimeter Return Pipe 25 Secondary Perimeter Return Pipe 27 Secondary Interior Forward Pipe 29 Secondary Interior Return Pipe 41 Forward Connection Pipe 43a to 43d, 47a to 47d Open / close Valve 45 Return piping

Claims (1)

[Claims] 1. A piping system for connecting an arbitrary number of heat source devices to a piping system of different air conditioning modes according to an air conditioning load from a plurality of heat source devices provided with outward piping and return piping. The forward pipe of the heat source device is connected to the forward connecting pipe, one end of the forward connecting pipe is connected to the secondary side perimeter forward pipe, and the other end of the forward connecting pipe is connected to the secondary interior forward pipe. Of the heat source device is connected to a return passage connecting pipe, one end of the return passage connecting pipe is connected to a secondary side perimeter return pipe, and the other end of the return passage connecting pipe is connected to a secondary side interior return pipe. A piping system for a plurality of heat sources, which is connected to a pipe, and is provided with an on-off valve in each of the outward passage connecting pipes between the outward passage pipes and the return passage connecting pipes between the return passage pipes.