JP2011002180A - Local pump system in heating medium supplying facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system wherein a whole system has high efficiency and versatility by providing a low pump head in a local pump with a small water capacity.SOLUTION: In the heating medium supplying facility including a plurality of secondary side facilities 1 connected in parallel with each other, the local pump 3 included in each secondary facility 1 and having an inverter or the like, a cold and heat source machine 2 producing a heating medium, a primary side pump 4 supplying the heating medium of the cold and heat source machine 2 to the local pump 3, a heating medium supply main pipe 5 supplying the heating medium from an outlet side of the cold and heat source machine 2 to each secondary side facility 1, a heating medium return pipe 6 returning the heating medium from each secondary side facility 1 to an inlet side of the cold and heat source machine 2, and a heating medium supply branch pipe 7 with one end connected to the heating medium supply main pipe 5 and the other end connected to the heating medium return pipe 6 and supplying the heating medium to each secondary side facility 1 and each local pump 3, a booster pump 8 having an inverter or the like sending the heating medium to each local pump is provided between the cold and heat source machine 2 and the secondary side facilities 1.

Description

  The present invention relates to a local pump system in a heat medium supply facility and a control method thereof.

  Conventionally, a heat medium supply facility supplies a flow rate of a heat medium such as cold water or hot water led from a cold / hot heat source machine to a plurality of secondary equipment such as air conditioners and heat exchangers provided in a building through a pipeline. Control is performed according to the air conditioning load for each secondary-side facility. Although this control has been performed by a control valve or the like, there is an energy loss due to the restriction of the control valve particularly at the time of partial load, and an improvement measure has been required.

  Therefore, a system for controlling without using the control valve or the like has been devised, and a system for a primary pump that secures a flow rate of the local pump and the entire heat medium, in which a heat medium having a flow rate corresponding to a variable load flows. A configuration was proposed.

  As shown in FIG. 9, this system is provided with a local pump 3 capable of varying the capacity of an inverter or the like (hereinafter referred to as “inverter or the like”) corresponding to the secondary equipment 1 for each zone. The flow rate of the heat medium sent from the cool / heat source device 2 by the side pump 4 is adjusted for each local pump 3, and the heat medium is sent to the secondary equipment 1. In this case, the lifting range of the primary pump 4 is as follows: b → b → cooling / heating source 2 → c in FIG. 9, and the lifting range of each local pump 3 is c → d → secondary equipment 1 in FIG. → Ho → Lee. As a result, useless energy loss due to the conventional control valve can be eliminated. This also applies to Patent Documents 1 and 2.

Japanese Patent No. 3708660 Japanese Patent No. 3490986

  However, the local pump system in the heat medium supply facility as shown in FIG. 9 has the following drawbacks in the pressure range of the local pump. The local pump has a small amount of water for each secondary facility. Therefore, the efficiency of the selected pump is low and the model and shape of the pump are limited. Moreover, when the distance of the piping from the cold / hot heat source machine to the secondary side equipment becomes long and the piping resistance increases, the local pump becomes a high head. Accordingly, the operation efficiency of the pump becomes low due to a small amount of water and a high head.

This is also clear from the following. The specific speed n _S of the pump is an amount indicating the shape of the pump impeller, and is expressed by the following formula, and normally takes a value at the highest efficiency point.

From Equation 1, n _S decreases as the head increases. As n _S decreases, at the same flow rate and number of revolutions, the lift is increased according to Equation 1, and the efficiency decreases as shown in FIG. Note that FIG. 10 is the “Pump New Handbook” published on February 28, 1984, edited by the Japan Society of Industrial Machinery Manufacturers Pump Engineers Association, published on February 28, 1984. Quoted from “Discharge rate and pump efficiency”.

  The present invention takes such a conventional technique into consideration, and in the local pump system in the heat medium supply facility, the local pump has a small amount of water and a low head, and the system is highly efficient and versatile, and its control. It is intended to provide a method.

  Accordingly, the invention of claim 1 generates a heat medium, a plurality of secondary equipment connected in parallel, a local pump having an inverter for supplying a heat medium provided in each secondary equipment, and the like. A cooling / heating source, a primary pump that supplies a heat medium generated by the cooling / heating source to the local pump, and a heating medium that supplies the heating medium from the outlet side of the cooling / heating source to each secondary facility A supply main pipe, a heat medium return main pipe for returning the heat medium from each secondary side equipment to the inlet side of the cold / hot heat source machine, one end connected to the heat medium supply main pipe and the other end to the heat medium return main pipe, In a heat medium supply facility comprising a secondary medium and a heat medium supply branch pipe for supplying the heat medium to each local pump, and a bypass pipe between the heat medium supply main pipe and the heat medium return main pipe, The heating medium closest to the cold / hot heat source machine To the heat medium supply main pipe between the supply branch pipe, sending the heat medium to the respective local pump of each heat medium supply branch pipe, and a local pump system having a booster pump having an inverter and the like.

  Further, the invention of claim 2 provides a plurality of secondary-side equipment connected in parallel, a local pump having an inverter for supplying a heat medium provided in each secondary-side equipment, and a cold temperature for generating the heat medium. A heat source device, a primary pump that supplies the heat medium generated by the cold / hot heat source device to the local pump, and a heat medium supply that supplies the heat medium from the outlet side of the cool / heat source device to the secondary equipment. A main pipe, a heat medium return main pipe for returning the heat medium from each secondary side equipment to the inlet side of the cold / hot heat source machine, one end connected to the heat medium supply main pipe and the other end to the heat medium return main pipe, In the heat medium supply facility comprising a secondary medium and a heat medium supply branch pipe for supplying the heat medium to each local pump, and a bypass pipe between the heat medium supply main pipe and the heat medium return main pipe, Each of the above-mentioned local Send a heat medium to the pump, and a local pump system having a booster pump having an inverter and the like.

  Further, the invention of claim 3 generates a heat medium, a plurality of secondary equipment connected in parallel, a local pump having an inverter for supplying a heat medium provided in each secondary equipment, and the like. A cooling / heating source, a primary pump that supplies a heat medium generated by the cooling / heating source to the local pump, and a heating medium that supplies the heating medium from the outlet side of the cooling / heating source to each secondary facility A supply main pipe, a heat medium return main pipe for returning the heat medium from each secondary side equipment to the inlet side of the cold / hot heat source machine, one end connected to the heat medium supply main pipe and the other end to the heat medium return main pipe, In a heat medium supply facility comprising a secondary medium and a heat medium supply branch pipe for supplying the heat medium to each local pump, and a bypass pipe between the heat medium supply main pipe and the heat medium return main pipe, In the heat medium supply main pipe, heat medium Send to said each local pump body supply branch pipe, a booster pump having an inverter, all local pump is a local pump system provided at a plurality of intervals at a position not to high lift.

  The invention of claim 4 is the heat medium supply main pipe before the branch point of the heat medium supply branch pipe closest to the outlet side of the cold / hot heat source machine in the invention of any one of the first to third aspects. A pipe connecting the heat medium return main pipe before the junction of the heat medium supply branch pipe closest to the inlet side of the cold / hot heat source machine, a flow meter is provided in the pipe, and the heat medium of the flow meter The control method of the local pump system performs variable control of the booster pump so that the flow rate from the supply main pipe to the heat medium return main pipe is zero or more and zero as much as possible.

  The invention of claim 5 is the heat medium supply main pipe before the branch point of the heat medium supply branch pipe closest to the outlet side of the cold / hot heat source machine in the invention of any one of the first to third aspects. , A pipe connecting the heat medium return main pipe before the junction of the heat medium supply branch pipe closest to the inlet side of the cold / hot heat source machine is provided, a differential pressure gauge is provided in the pipe, and the heat medium of the differential pressure gauge The control method of the local pump system performs variable control of the booster pump so that the differential pressure obtained by subtracting the pressure value of the heat medium return main pipe from the pressure value of the supply main pipe is zero or more and zero as much as possible.

  According to the first, second, and third aspects of the present invention, even when the distance of the pipe from the cold / hot heat source machine to the secondary side equipment is long, the booster pump is provided so that each secondary side equipment has a heat medium. This is a versatile heat medium supply facility that distributes the force for pushing the pump, enables high-efficiency operation of the low-lift pump, and reduces the total pump power of the entire system.

  According to the inventions of claims 4 and 5, the heat medium supply main pipe before the branch point of the heat medium supply branch pipe closest to the outlet side of the cold / hot heat source machine and the inlet side of the cold / hot heat source machine. A pipe connecting the heat medium return main pipe before the junction of the nearest heat medium supply branch pipe is provided, and a flow meter or a differential pressure gauge is provided in the pipe, and the flow rate or differential pressure of these flow meters or differential pressure gauges is Since the booster pump is variably controlled so that it is zero or more and zero as much as possible, the head of the booster pump with a large amount of water is raised and the head of the local pump with a small amount of water is lowered. Operation with high efficiency is possible.

  The present invention includes a plurality of secondary equipment connected in parallel, a local pump having an inverter or the like for supplying a heat medium provided in each secondary equipment, a cooling / heating source that generates a heat medium, A primary pump that supplies the local medium with the heat medium generated by the cold / hot heat source machine, a heat medium supply main pipe that supplies the heat medium from the outlet side of the cold / hot heat source machine to the secondary equipment, and A heat medium return main pipe for returning the heat medium from each secondary side equipment to the inlet side of the cold / hot heat source machine, one end connected to the heat medium supply main pipe and the other end to the heat medium return main pipe, In a heat medium supply facility comprising a heat medium supply branch pipe for supplying the heat medium to each local pump, and a bypass pipe between the heat medium supply main pipe and the heat medium return main pipe, the cold / heat source device 2 Heat medium between each side equipment Send to Karuponpu, the local pump system having a booster pump having an inverter, etc., This allows the pump of small amount of water in low head, efficiently operated, and as a versatile.

Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall configuration diagram of a local pump system of a heat medium supply facility according to the present invention. In the local pump system of the heat medium supply facility, the secondary equipment 1 is installed, for example, for each area of a building. If the secondary equipment 1 is an air conditioner, a system-specific air supply duct is connected to each air conditioning area. The cold / hot water coil of the air conditioner is supplied with a heat medium such as cold water or hot water from the cold / hot heat source machine 2, and heat is exchanged in the secondary equipment 1 such as the air conditioner, and the cold / hot heat source machine 2 side. To come back.

  In addition, for example, the secondary equipment 1 installed for each of a plurality of floors is connected in parallel to each other, and each secondary equipment 1 is provided with a local pump 3 having an inverter or the like. The primary side pump 4 which supplies the heat medium produced | generated by this to the said local pump 3 is provided. Further, a heat medium supply main pipe 5 for supplying a heat medium from the outlet side of the cold / hot heat source machine 2 to the secondary equipment 1, and an inlet side of the cold / hot heat source machine 2 for supplying the heat medium from the secondary equipment 1 And a heat medium return main pipe 6 to be connected to the heat medium return main pipe 5 and one end connected to the heat medium return main pipe 6. The secondary side equipment 1 and the local pumps 3 are connected to the heat medium return main pipe 6. A heat medium supply facility is provided which includes a plurality of heat medium supply branch pipes 7 for supplying a heat medium, and further includes a bypass pipe 9 between the heat medium supply main pipe 5 and the heat medium return main pipe 6. An inverter that sends the heat medium to the heat medium supply main pipe 5 from the cold / hot heat source unit 2 to the nearest branch point of the heat medium supply branch pipe 7 to the local pumps 3 of the heat medium supply branch pipes 7. Etc. are provided. In the first embodiment, two sets of the cold / hot heat source device 2 and the primary pump 4 are provided.

  In the case of the first embodiment, the lifting range of the primary pump 4 is from A to B in FIG. 1 to the cool / heat source unit 2 to C. Further, the lifting range of the booster pump 8 is C → D and G → B. The range of lift of each local pump 3 is as follows: D → E → Secondary equipment 1 → F → G.

  FIG. 2 is a pressure diagram of the first embodiment. In the figure, (a) to (g) indicate pressures at the positions of the same letters (a) to (g) in FIG. By arranging the booster pump 8 in this manner, the head is dispersed for each pump, so that highly efficient operation is possible, and the total value of pump power of the entire system can be reduced. Further, when the booster pump 8 is provided in the heat medium supply main pipe 5 as described above, the flow rate of the booster pump 8 becomes larger than that provided in each heat medium supply branch pipe 7 of Example 2 described later, and the pump efficiency is also increased. high.

  Next, a local pump system of a heat medium supply facility according to Embodiment 2 of the present invention will be described. FIG. 3 shows an overall configuration diagram of the system.

  The second embodiment differs from the first embodiment in the arrangement of the booster pump 8 and is arranged in series with the local pump 3 of each heat medium supply branch pipe 7. Other configurations are the same as those of the first embodiment.

  In the case of the second embodiment, the lifting range of the primary pump 4 is from A to B in FIG. 3 to the cool / heat source unit 2 to C. Further, the lifting range of the booster pump 8 and the local pump 3 is as follows: C → D → E → secondary equipment 1 → F → G → B. FIG. 4 is a pressure diagram of the second embodiment. In the figure, (a) to (g) indicate pressures at the positions of the same letters (a) to (g) in FIG.

  Next, a local pump system of a heat medium supply facility according to Embodiment 3 of the present invention will be described. FIG. 5 shows an overall configuration diagram of the system.

  The third embodiment is applied when the heat medium supply main pipe led out from the cold / hot heat source device 2 is long, and the arrangement of the booster pump 8 is different from those of the first and second embodiments. One booster pump 8a is provided in the heat medium supply main pipe 5 from the cold / hot heat source apparatus 2 to the nearest heat medium supply branch pipe 7, and the other booster pump 8b is a heat medium derived from the cold / heat source apparatus 2. The supply main pipe 5 is provided in the heat medium supply main pipe 5 between the plurality of heat medium supply branch pipes 7 and the plurality of heat medium supply branch pipes 7. Other configurations are the same as those of the first embodiment. A plurality of the other booster pumps 8b are provided as necessary when the length of the heat medium supply main pipe 5 is further increased.

  In the case of the third embodiment, the lifting range of the primary pump 4 is from A to B in FIG. 5 to the cool / heat source unit 2 to C. Further, the same range of the booster pump 8a is up to C → D and L → I in FIG. 5, and the same range of the local pump 3a is D → E → secondary equipment 1 → N → L in FIG. Further, the lifting range of the booster pump 8b is E → F and R → N, and the same range of the local pump 3b is H → G → Secondary equipment 1 → H → R. FIG. 6 is a pressure diagram of the third embodiment. In the figure, (a) to (le) indicate the pressures at the positions of the same letters (a) to (le) in FIG.

In the systems of the first to third embodiments, when the operating efficiency of the pump is prioritized and the heads of the booster pump 8 and the local pump 3 are considered, the head on the booster pump 8 side with a large amount of water is increased as much as possible, In addition, it is preferable that the head on the local pump side with a small amount of water be low. Therefore, as shown in FIG. 7, the point A of the heat medium supply main pipe 5 just before the branch point of the heat medium supply branch pipe 7 closest to the outlet side of the cold / hot heat source machine 2 and the inlet of the cold / hot heat source machine 2 A pipe connecting the point A ′ of the heat medium return main pipe 6 before the junction of the heat medium supply branch pipe 7 closest to the side is provided, and a flow meter 10 is provided in the pipe, and the flow rate of the flow meter 10 is The booster pump 8 is variably controlled so as to be zero or more and zero as much as possible. At this time, it is necessary that the pressure P _A ≦ P _{A ′} . Further, FIG. 8 is provided with a differential pressure gauge 11 in place of the flow meter 10 of FIG. 7, and in this case, the booster pump 8 is configured so that the differential pressure of the differential pressure gauge 11 is zero or more and zero as much as possible. Perform variable control.

  7 and 8 correspond to the first embodiment, but the present invention can also be applied to the second and third embodiments. Also in the second and third embodiments, the pipe provided with the flow meter 10 or the differential pressure gauge 11 is the heat medium supply main pipe 5 before the branch point of the heat medium supply branch pipe 7 closest to the outlet side of the cold / hot heat source machine 2. Between the point A and the point A ′ of the heat medium return main pipe 6 before the junction of the heat medium supply branch pipe 7 closest to the inlet side of the cold / hot heat source unit 2. In the case of the third embodiment, in addition to the position of the first embodiment, the point A of the heat medium supply main pipe 5 before the branch point of the heat medium supply branch pipe 7 next to each booster pump 8b in FIG. And the pipe having the flow meter 10 or the differential pressure gauge 11 is provided between the heat medium supply branch pipe 7 and the A ′ point of the heat medium return main pipe 6 before the junction of the heat medium supply branch pipe 7 and the heat medium return main pipe 6. In some cases, the corresponding booster pumps 8 are variably controlled so that the flow rate or differential pressure of the flow meter 10 or the differential pressure meter 11 is zero or more and zero as much as possible.

It is a schematic block diagram of the system of Example 1 of this invention. It is a pressure diagram of FIG. It is a schematic block diagram of the system of Example 2 of this invention. FIG. 4 is a pressure diagram of FIG. 3. It is a schematic block diagram of the system of Example 3 of this invention. FIG. 6 is a pressure diagram of FIG. 5. It is a schematic block diagram which provided the flowmeter in the structure of Example 1 of this invention. It is a schematic block diagram which provided the differential pressure gauge in the structure of Example 1 of this invention. It is a schematic block diagram of the local pump system of a prior art example. It is a graph regarding the discharge amount and pump efficiency of a pump.

1 Secondary equipment 2 Cooling / heating source 3 Local pump 4 Primary pump
5 Heat medium supply main pipe 6 Heat medium return main pipe 7 Heat medium supply branch pipe 8 Booster pump 9 Bypass pipe 10 Flow meter 11 Differential pressure gauge

Claims (5)

A plurality of secondary equipment connected in parallel, a local pump capable of varying the capacity for supplying the heat medium provided in each secondary equipment, a cooling / heating source that generates the heating medium, and the cooling / heating source A primary pump that supplies the heat medium generated by the machine to the local pump, a heat medium supply main pipe that supplies the heat medium from the outlet side of the cold / hot heat source machine to the secondary equipment, and the secondary A heat medium return main pipe for returning the heat medium from the side equipment to the inlet side of the cold / hot heat source machine, one end connected to the heat medium supply main pipe and the other end to the heat medium return main pipe, each secondary side equipment and each local pump A heat medium supply branch pipe that supplies the heat medium to a heat medium supply facility, and a heat medium supply facility that includes a bypass pipe between the heat medium supply main pipe and the heat medium return main pipe,
A booster pump capable of varying the capacity, which sends the heat medium to the local pumps of each heat medium supply branch pipe to the heat medium supply main pipe between the cold / hot heat source machine and the closest heat medium supply branch pipe A local pump system characterized by being provided. A plurality of secondary equipment connected in parallel, a local pump capable of varying the capacity for supplying the heat medium provided in each secondary equipment, a cooling / heating source that generates the heating medium, and the cooling / heating source A primary pump that supplies the heat medium generated by the machine to the local pump, a heat medium supply main pipe that supplies the heat medium from the outlet side of the cold / hot heat source machine to the secondary equipment, and the secondary A heat medium return main pipe for returning the heat medium from the side equipment to the inlet side of the cold / hot heat source machine, one end connected to the heat medium supply main pipe and the other end to the heat medium return main pipe, each secondary side equipment and each local pump A heat medium supply branch pipe that supplies the heat medium to a heat medium supply facility, and a heat medium supply facility that includes a bypass pipe between the heat medium supply main pipe and the heat medium return main pipe,
A local pump system characterized in that each heat medium supply branch pipe is provided with a booster pump capable of supplying a heat medium to each local pump and capable of varying the capacity. A plurality of secondary equipment connected in parallel, a local pump capable of varying the capacity for supplying the heat medium provided in each secondary equipment, a cooling / heating source that generates the heating medium, and the cooling / heating source A primary pump that supplies the heat medium generated by the machine to the local pump, a heat medium supply main pipe that supplies the heat medium from the outlet side of the cold / hot heat source machine to the secondary equipment, and the secondary A heat medium return main pipe for returning the heat medium from the side equipment to the inlet side of the cold / hot heat source machine, one end connected to the heat medium supply main pipe and the other end to the heat medium return main pipe, each secondary side equipment and each local pump A heat medium supply branch pipe that supplies the heat medium to a heat medium supply facility, and a heat medium supply facility that includes a bypass pipe between the heat medium supply main pipe and the heat medium return main pipe,
A plurality of booster pumps with variable capacities that send the heat medium to the respective local pumps of the respective heat medium supply branch pipes to the heat medium supply main pipe at intervals where all the local pumps do not have a high head. A local pump system characterized by being provided.   In the local pump system in any one of Claims 1-3, the said heat-medium supply main pipe before the branch point of the heat-medium supply branch pipe nearest from the exit side of the said cold-heat source apparatus, and the said cold-heat source apparatus A pipe connecting the heat medium return main pipe before the junction of the heat medium supply branch pipe closest to the inlet side is provided, a flow meter is provided in the pipe, and the heat medium return of the flow meter from the heat medium supply main pipe is provided. A control method for a local pump system, wherein the booster pump is variably controlled so that the flow rate to the main pipe is zero or more and zero as much as possible.   In the local pump system in any one of Claims 1-3, the said heat-medium supply main pipe before the branch point of the heat-medium supply branch pipe nearest from the exit side of the said cold-heat source apparatus, and the said cold-heat source apparatus A pipe connecting the heat medium return main pipe before the junction of the heat medium supply branch pipe closest to the inlet side is provided, a differential pressure gauge is provided in the pipe, and from the pressure value of the heat medium supply main pipe of the differential pressure gauge A control method for a local pump system, wherein the booster pumps are variably controlled so that the differential pressure obtained by subtracting the pressure value of the heat medium return main pipe is zero or more and zero as much as possible.