JPH0519839U - Simultaneous cooling and heating air conditioning system - Google Patents

Abstract

(57) [Summary] [Purpose] Cooling and heating are performed simultaneously by two different systems, and the cost is reduced by using a small number of on-off valves. [Configuration] Heat source units 31 to 3 capable of switching between cooling and heating
4 is provided. Cooling pipes 35a, 35b, 36 and heating pipes 37a, 37b, 38 are provided, and both pipes are connected to each indoor unit 39 via a switching valve 40. The header portion 42 is provided with an inflow side collecting pipe 47 connecting the inflow ports of the respective heat source units 31 to 34 and an outflow side collecting pipe 49 connecting the outflow ports. The collecting pipes 47, 47 are adjacent to each other. On-off valves 51 to 54 are provided between the heat source machines. [Effects] A part of the heat source device is cooled and the rest is heated, and by setting the open / close states of the on-off valves 51 to 54, cold water is circulated to the cooling pipe and hot water is circulated to the heating pipe. Can be made. As a result, simultaneous cooling and heating air conditioning can be performed using a small number of on-off valves.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling / heating simultaneous air-conditioning system capable of performing cooling and heating simultaneously by performing a cooling operation on a part of a plurality of heat source units and a heating operation on the rest. It relates to a simultaneous cooling and heating air conditioning system that can reduce the number of various valves.

[0002]

[Prior Art]

 Conventionally, in office buildings for businesses and tenant buildings for stores, cold water (or cold air) is supplied from the heat source equipment for cooling and heating in the machine room during cooling, and hot water (or warm air) is supplied during heating through pipes. Air-conditioning systems that cool and heat each room by supplying it to the indoor units installed in each room are becoming widespread. In this conventional air conditioning system, all heat source units are switched to heating operation in winter, and all heat source units are switched to cooling operation in summer, so that either one of heating and cooling is performed for the entire building. It is a unified structure.

[0003]

[Problems to be solved by the device]

 However, for example, in spring or early winter (hereinafter referred to as "intermediate period"), the southern part of the building may become warm and require cooling in a room with strong sunlight. In addition, in the autumn and early summer (hereinafter also referred to as "interim period"), the north room does not receive sunlight, so heating may be required early in the morning or at night. In order to deal with the case where an operation contrary to the main air conditioning operation in such an intermediate period is required, for example, an air conditioning system as shown in FIG. 4 is hypothesized. The air conditioning system shown in the figure uses four heat source units 1 to 4 capable of switching between cooling and heating, and each indoor unit 9 (only one unit is shown in the drawing, but actually, a plurality of units are provided). It is assumed that they are connected in parallel) to supply cold and hot water to perform heating and cooling. Between the heat sources 1 to 4 and the indoor unit 9, there are provided two pipes, that is, the cooling pipes 5 and 6 and the heating pipes 7 and 8, and the cold water flows into the cooling pipes 5 and 6. , Hot water is determined to flow to the heating pipes 7 and 8. Each of the indoor units 9 is connected to both the cooling pipes 5 and 6 and the heating pipes 7 and 8 by branch pipes 13 to 16, and the three-way valves 10 and 11 open the pipes of either system. By doing so, either air conditioning of cooling or heating can be obtained.

Further, as described above, the cooling pipes 5 and 6 and the heating pipes 7 and 8 are provided in order to flow cold water to the cooling pipes 5 and 6 and hot water to the heating pipes 7 and 8, respectively. In the connection part (hereinafter, referred to as a header part) 12 connected to the heat source devices 1 to 4, outflow side collecting pipes 17 and 18 that connect each of the outlets of the heat source devices 1 to 4 and each heat source device 1 are connected. Inflow side collecting pipes 19 and 20 that connect each of the inflow ports 4 to 4 are provided, and one is respectively provided between these collecting pipes 17 to 18 and the outflow ports and the inflow ports of the heat source devices 1 to 4. Each of the on-off valves 21-1 to 21-16 (indicated by the reference numerals 21-1, 21-2, 21-3 ..., 21-14, 21-15, 21-16 in order from the left side in the drawing). To be intervened. Then, for example, if the heat source device 1 is in the cooling operation, the opening / closing valve 21-3 between the outlet and the collecting pipe 17 leading to the cooling pipe 6 on the outflow side is opened to connect the heating pipe 8 to the heating pipe 8. The on-off valve 21-4 connected to the collecting pipe 18 communicating therewith is closed, and the on-off valve 21-1 opened between the inlet and the collecting pipe 19 communicating with the cooling pipe 5 on the inflow side is opened to open the heating pipe. The on-off valve 21-2 with the collecting pipe 20 leading to 7 is closed. That is, each of the on-off valves 21-1 to 21- is connected so that the heat source device performing the cooling operation is connected to the cooling pipes 5 and 6 and the heat source device performing the heating operation is connected to the heating pipes 7 and 8. 16 is switched. However, in such a virtual system, it is necessary to provide opening / closing valves 21-1 to 21-16 for two heating and cooling systems for each of the outlets and inlets of the heat source units 1 to 4, so that If the number of on-off valves increases, the number of on-off valves will also increase, which will increase the cost of installing these on-off valves, increase the frequency of failures, and increase maintenance costs.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a plurality of indoor units, a plurality of heat source devices capable of switching between cooling and heating, and a cooling fluid flowing out from the heat source devices. A cooling pipe for supplying to each of the indoor units, a heating pipe for supplying the heating fluid flowing out from the heat source device to each of the plurality of indoor units, and provided for each of the indoor units. In a simultaneous cooling and heating air conditioning system equipped with a switching valve that selectively opens either the piping or the heating piping, each heat source is provided in the header part that connects the cooling piping and the heating piping to the heat source unit. An outlet side collecting pipe that connects each of the outlets of the machine and an inlet collecting pipe that connects each of the inlets of the heat source machines, with a plurality of unit areas between the adjacent heat source machines of the collecting tube. An on-off valve is installed at a unit location.

[0006]

[Action]

 With the above-described configuration, the simultaneous cooling and heating air conditioning system of the present invention causes a part of the plurality of heat source units to perform a cooling operation or a heating operation, and the remaining heat source devices to perform different air conditioning operations, and the cooling fluid is flowed to the cooling pipes. Further, the heating fluid is caused to flow through the heating pipe, and at the same time, the switching valve on the indoor unit side opens either one of the pipes to perform simultaneous cooling and heating air conditioning. In addition, the system of the present invention is configured such that the header part connecting the cooling pipe and the heating pipe to the heat source device is connected to the outflow side collecting pipe connecting each of the outlet ports of each heat source device and the inlet port of each heat source device. An inflow-side collecting pipe for connecting each of the above is provided, and an opening / closing valve is provided at a plurality of unit positions with a unit between adjacent heat source units of the collecting pipe as a unit position. By switching the on / off valve, the on / off valve between the heat source unit operating in the cooling mode and the heat source unit operating in the heating mode is closed, so that fluids having different temperatures do not mix in one collecting pipe. It is possible to control the flowing direction of the fluid so that the cooling fluid flows into the cooling pipe and the heating fluid flows into the heating pipe.

[0007]

【Example】

 An embodiment of the simultaneous cooling and heating air conditioning system according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an embodiment of the simultaneous cooling and heating air conditioning system according to the present invention. This drawing shows, for example, cold / hot water (or other fluid such as cold / air) by a plurality of heat source units 31 to 34 provided on the roof of an indoor unit 39 installed in each room such as an office building. ) Is supplied to control the entire building. Each of the heat source units 31 to 34 is a heat source unit capable of switching between heating and cooling (for example, a gas absorption type chiller-heater, a compressor equipped with a compression refrigerator and a hot-water boiler, etc.), and these heat source units 31 to 34. Is slightly larger than the total load capacity of all indoor units 39 (only two units are shown in the figure, but in reality, more units are connected in parallel). It is set. The number and total capacity of the heat source units 31 to 34 are not limited, and may be the same as the total load capacity of all the indoor units 39.

The four heat source units 31 to 34 are all connected to both the cooling pipes 35 a, 35 b, 36 and the heating pipes 37 a, 37 b, 38. The cooling pipe 35a is a pipe on the cold water outflow side for supplying cold water to each indoor unit 39, the cold water having the temperature at the time of flowing out from the heat source units 31 to 34 flows to 35a, and the indoor unit 39 to 35b. Cold water flows after absorbing heat. The cooling pipe 36 is a pipe on the cold water inflow side for returning the cold water reaching the differential pressure regulating valve 55 to the heat source units 31 to 34. Similarly, hot water having the temperature at the time of flowing out from the heat source units 31 to 34 flows through the heating pipe 37a, and hot water after radiating heat in the indoor unit 39 flows through 37b. Reference numeral 38 denotes a hot water inflow side pipe for returning the hot water reaching the differential pressure adjusting valve 55 to the heat source units 31 to 34. The cold / hot water is circulated by the pump 50 interposed on the inlet side of each of the heat source units 31 to 34. Each indoor unit 39 has a switching valve 40 that selectively opens either one of the cooling pipe 35a and the heating pipe 37a.

Further, each of the inlets of the heat source units 31 to 34 is connected to the header portion 42 that connects the cooling pipes 35 a, 35 b, 36 and the heating pipes 37 a, 37 b, 38 to the heat source units 31 to 34. The inflow side collecting pipe 47 and the outflow side collecting pipe 49 that connects each of the outlets of the heat source units 31 to 34 are provided. Further, the inflow side collecting pipe 47 and the outflow side collecting pipe 49 are respectively opened and closed between the adjacent heat source units 31 and 32 and between the adjacent adjacent heat source units 33 and 34. Valves 51-54 are interposed.

In this embodiment, the controller 60 is provided to automatically perform the switching operation between the heat source units 31 to 34, the cooling operation and the heating operation, and the switching operation of the on-off valves 51 to 54. The controller 60 inputs an operation signal of an operation switch 61 of the indoor unit 39 (not shown, but is provided for each indoor unit 39) and air-conditions based on the number of operating indoor units 39. The load capacity is calculated, and control is performed to operate the heat source units 31 to 34 of a suitable number. Further, the controller 60 inputs the operating state of the operation switch of each indoor unit 39 (air-conditioning switching operation), and controls to switch the operation mode of the heat source units 31 to 34 to either cooling operation or heating operation. In the switching control of this operation mode, when only a request signal for cooling is input from the indoor unit 39, the heat source units 31 to 34 perform the cooling operation by the required number for the calculated load capacity, and the indoor unit 39 When only the heating request signal is input, the heating operation is performed by the required number of heat source units 31 to 34 for the calculated load capacity. Further, when the air conditioning mode requested by the indoor unit 39 is different, as in the middle period, the required number of heat source units 31 to 34 are cooled and the remaining heat source units are operated based on the required load capacity of the air conditioning. Only the required number of heating units are operated. Then, the controller 60 controls the switching of the on-off valves 51 to 54 in accordance with the switching control operation of the operation modes of the heat source units 31 to 34, so that all the cold water flowing out from the heat source units in the cooling operation is discharged. All of the hot water flowing through the cooling pipes 35a, 35b, 36 and flowing out from the heat source device that is being heated is allowed to flow through the heating pipes 37a, 37b, 38. Further, the controller 60 controls the switching valve 40 of each indoor unit 39 to supply cold / hot water that matches the required air conditioning mode to each indoor unit 39 so that the cooling pipes 35a, 35b or the heating pipe 37a are supplied. , 37b is controlled to be opened. Therefore, automatic valves are used for the switching valve 40 and the on-off valves 51 to 54.

The operation of the air conditioning system of this embodiment having the above-described configuration will be described below. First, since only the signal requesting heating from the indoor unit 39 is input to the controller 60 during the heating only operation in the winter season (hereinafter referred to as the heating peak period, for example, December to February). The controller 60 sends a control signal to the total heat source units 31 to 34 to set the total heat source units 31 to 34 only for heating operation. Then, a control signal is sent to the open / close valves 51 to 54 to open all the open / close valves 51 to 54. Furthermore, the controller 60 sends a control signal to the switching valve 40 of each indoor unit 39 to switch so as to open the heating pipes 37a, 37b side. Thereby, the hot water flowing out from each of the heat source devices 31 to 34 is supplied from the collecting pipe 47 to each indoor unit 39 through the heating pipes 37a and 37b, and through the return pipe 38 from the collecting pipe 49 to the heat source devices 31 to 34. Return to the inlet. Therefore, heating can be obtained in each room. Similarly, during the summer only (hereinafter, referred to as a cooling peak period, for example, from July to September), only the signal requesting the cooling from the indoor unit 39 is input to the controller 60 during the cooling only operation. Therefore, the controller 60 sends a control signal to the total heat source units 31 to 34 to set the total heat source units 31 to 34 only to the cooling operation. Then, a control signal is sent to the open / close valves 51 to 54 to open all the open / close valves 51 to 54 also in this case. Further, the controller 60 sends a control signal to the switching valve 40 of each indoor unit 39 to switch so as to open the cooling pipes 35a, 35b. As a result, the hot water flowing out of each of the heat source units 31 to 34 is supplied from the collecting pipe 47 to each of the indoor units 39 through the cooling pipes 35a and 35b, and through the return pipe 36 from the collecting pipe 49 to the heat source units 31 to 31. Return to the 34 inlet. Therefore, cooling can be obtained in each room.

On the other hand, in the interim period, the controller 60 determines that it is the interim period because the demand signal for the air conditioning mode from each indoor unit 39 includes the demand for cooling and the demand for heating, and thus the controller 60 determines Based on the number of requests and the number of requests for heating, it is determined how many of the heat source units 31 to 34 are to be cooled and to be heated. Then, a control signal is sent to the heat source units 31 to 34 to perform the cooling operation or the heating operation. FIG. 2 is a diagram showing an operating state in the intermediate period of autumn or early summer. Among the on-off valves 51 to 54 in the figure, the ones in black are closed and the ones in white are open. It is supposed to be covered. This is the same in FIG. 3 described later. In the middle of the fall or early summer, the air-conditioning mode is mainly air-conditioning, but the temperature of some rooms may be low and heating may be required. Therefore, a small number of heating request signals are mixed with a large number of cooling request signals and are input to the controller 60. At this time, since the number of rooms that require heating is small, the heating load capacity is small, and the heating operation of one heat source unit 34 should be sufficient. Therefore, as shown in FIG. 2, the controller 60 performs the cooling operation of the three heat source units 31 to 33 near the cooling pipes 35a and 35b by the required number corresponding to the cooling load capacity, and the heating pipes 37a, One heat source unit 34 close to 37b is operated for heating. At the same time, the on-off valves 53 and 54 between the adjacent heat source units 33 and 34 are closed, and the remaining on-off valves 51 and 52 are opened. Further, the switching valve 40 of the indoor unit 39 that has made a heating request is switched to the heating pipes 37a and 37b side, and the switching valves 40 of the remaining indoor units 39 are switched to the cooling pipes 35a and 35b side. As a result, the main cooling operation and the heating operation with a small load capacity can be performed at the same time.

Next, FIG. 3 is a diagram showing an operating state in an intermediate period of spring or early winter. In this case, contrary to the case of FIG. 2, the air-conditioning mode is mainly heating, but there are cases where the temperature of some rooms becomes high and cooling is required. Therefore, a small number of cooling request signals are mixed with a large number of heating request signals and are input to the controller 60. At this time, since the number of rooms that require cooling is small, the cooling load capacity is small and the heating operation of one heat source unit 31 should be sufficient. Therefore, as shown in FIG. 3, the controller 60 performs the heating operation of one heat source unit 32 to 34 near the heating pipes 37a and 37b by a required number corresponding to the heating load capacity, and is close to the cooling pipes 35a and 35b. The one heat source unit 3 1 is cooled. At the same time, the opening / closing valves 51, 52 between the adjacent heat source units 31, 32 are closed, and the remaining opening / closing valves 53, 54 are opened. Further, the switching valve 40 of the indoor unit 39 that has requested cooling is switched to the cooling pipes 35a and 35b side, and the switching valve 40 of the remaining indoor units 39 is switched to the heating pipes 37a and 37b side. As a result, the main heating operation and the cooling operation with a small load capacity can be performed at the same time.

As described above, according to the air conditioning system of the present embodiment, a cooling / heating simultaneous air conditioning system can be realized by using a smaller number of opening / closing valves 51 to 54 as compared with the virtual system shown in FIG. Further, as in the present embodiment, by providing a plurality of heat source units 31 to 34 having a total capacity slightly larger than the total load capacity of all the indoor units 39, even during the peak cooling period and the peak heating period, It is possible to perform different air conditioning in some rooms while maintaining the same supply capacity of air conditioning, which enables simultaneous cooling and heating air conditioning throughout the year.

Although the on-off valves 51 to 54 are provided at two positions between the heat source units 31 and 32 and between the heat source units 33 and 34 in the above-described embodiment, the central heat source unit is shown. If the open / close valves are also provided between 32 and 33 and these are closed and the other open / close valves 51 to 54 are opened, the two heat source units 31, 32 and the heat source units 33, 34 are different. It can be operated in a manner. Needless to say, the present invention can be applied not only to the case of four heat source machines but also to a case of a larger number or a smaller number of heat source machines.

[0016]

[Effect of the device]

 As described in detail above, in the simultaneous cooling and heating air conditioning system of the present invention, a part of the plurality of heat source units is set to the cooling operation or the heating operation, and the remaining heat source units are set to the different air conditioning operation to cool the cooling pipes. Simultaneous cooling and heating can be performed by flowing the working fluid and the heating fluid to the heating pipe and opening either one of the pipes by the switching valve on the indoor unit side. In addition, the system of the present invention is such that the header part connecting the cooling pipe and the heating pipe to the heat source device is connected to the outflow side collecting pipe connecting each of the outlet ports of each heat source device and the inlet port of each heat source device. The number of on-off valves in the header section is increased by providing an inflow-side collecting pipe that connects each of the Can be significantly reduced as compared with the above-mentioned virtual system, so that it can be realized with only a slight increase in equipment as compared with the conventional system that cannot perform simultaneous cooling and heating air conditioning.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a cooling and heating simultaneous air conditioning system according to the present invention.

FIG. 2 is a diagram showing an operating state of the system of the embodiment in an intermediate period of autumn or early summer.

FIG. 3 is a diagram showing an operating state of the system of the embodiment in an intermediate period of spring or early winter.

FIG. 4 is a virtual configuration diagram of a cooling / heating simultaneous air conditioning system in which an opening / closing valve is provided in a header portion for each heat source unit.

[Explanation of symbols]

31-34 ... Heat source machine 35a, 35b, 36 ... Cooling piping 37a, 37b, 38 ... Heating piping 39 ... Indoor unit
40 ... Switching valve 42 ... Header part 47, 49 ... Collecting pipe 51-54
… Open / close valve

Claims (1)

[Scope of utility model registration request] 1. A plurality of indoor units, a plurality of heat source units capable of switching between cooling and heating, and a cooling system for supplying a cooling fluid flowing out from the heat source units to each of the plurality of indoor units. Pipe for heating, a heating pipe for supplying a heating fluid flowing out from the heat source unit to each of the plurality of indoor units, and one of the cooling pipe and the heating pipe provided in each indoor unit. In the cooling / heating simultaneous air-conditioning system including a switching valve that selectively opens, a header part that connects the cooling pipe and the heating pipe to the heat source device is connected to each of the outlet ports of each heat source device. An inflow-side collecting pipe that connects each of the outflow-side collecting pipe and each of the inflow ports of each heat source device is provided, and an opening / closing valve is provided at a plurality of unit positions with a unit position between adjacent heat source devices of the collecting pipe. Simultaneous cooling and heating air conditioning system.