JP2009106151A - Energy recovery apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the transmission efficiency, in connecting a motor with a water turbine for which a clutch is used in prior art, even though energy recovered by the water turbine is mechanical power, which cannot be used for other loads in a building, in terms of structure. <P>SOLUTION: An energy recovery apparatus includes a heat storage tank; a storage pump on a secondary system that draws water in the heat storage tank and sends the same to an air-conditioning load group, a first water pipe, provided between the discharge opening of the storage pump and the air-conditioning load group, a second water pipe that sends back the water discharged from the discharge opening of the air-conditioning load group to the heat storage tank, the water turbine provided at a lower section of the second water pipe; the motor that is rotate-driven by torque generated by the water turbine, an inverter that is connected to an output end of the motor; and a system linking device that converts DC received from the inverter into AC and supplies the same to a storage pump driving motor side of the secondary system. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for recovering unused energy of water by, for example, turbine power generation after use of an air conditioning load of a building, for example.

  For example, as a building air conditioning system, a heat source machine is operated using inexpensive late-night electricity, the produced heat is stored in a heat storage tank, and the stored heat is pumped out in the daytime when air conditioning load occurs. A regenerative air conditioning system that is sent to a certain air conditioner for air conditioning is widely adopted.

  FIG. 16 is a configuration diagram of an open-loop regenerative air conditioning system of a reference example.

  The structure as a primary system of the heat storage type air conditioning system in FIG. 16 will be described. 1 is a pump that pumps water from the heat storage tank 16 and supplies it to the heat source unit 4 through the water supply pipe 17, and 2 indicates the pump 1. An electric motor to be driven, 17 is a water pipe connecting the pumping pump 1 and the heat source unit 4, 3 is a commercial power source, 5 is a two-way valve for adjusting the amount of heat produced by the heat source unit 4, and 18 is from the heat source unit 4. A water supply pipe 6 that returns the discharged water to the heat storage tank 16 is an expansion tank provided in the water supply pipe 18. 29 is a foot valve, 25 is a gate valve, and 27 is a check valve.

  The configuration of the heat storage air conditioning system as the secondary system in FIG. 16 will be described. Reference numeral 7 denotes an air conditioning load group 10 (for example, an air handling unit) that pumps up water (heat) from the heat storage tank 16 and passes the water pipe 19. 10a, a fan coil 10b, and the like. The pump 8 is a double-shaft electric motor that drives the pump 7. The one end is connected to the pump 7 and the shaft coupling 14 at one end. Are directly connected to drive this. The other end is connected to the water wheel 9 via the clutch 13. Further, the water turbine 9 is provided at a site where the potential energy of water discharged from the air conditioner group 10 can be collected. 15 is a commercial power source (may be the same as the commercial power source 3), 11 is a two-way valve for adjusting the load amount of the air conditioning load group 10, and 20 is pumped water used in the air conditioner group 10 described above. A water supply pipe 12 for returning the water to the heat storage tank 16 is an expansion tank provided in the water supply pipe 20, which destroys the siphon so that a drop in the water supply (positional energy possessed by the water supply) is applied to the water turbine. Further, a vacuum break valve may be provided in place of the expansion tank 12. Reference numeral 24 denotes a water supply pipe for returning water to the heat storage tank 16 after water supply leaves the water wheel 9. A water pipe 22 is bypassed without passing through the water wheel 9. These water pipes are provided with gate valves 21-23. That is, the pumped water sent to the air conditioner group 10 by the pump 7 is used up and then sent to the water wheel 9. The water turbine 9 is driven by the potential energy of the pumped water to generate power and transmit it to the above-described double-shaft electric motor 8. The load on the double-shaft motor 8 is lighter than the load on the pump 7. Thereafter, the pumped water exiting the water wheel 9 returns to the heat storage tank 16. 26 is a gate valve, 28 is a check valve, and 30 is a foot valve.

  FIG. 17 shows an operation characteristic diagram of the pump and the water turbine of the reference example. H (m) in the upper part of the vertical axis in the figure indicates the total head in the case of a pump, and an effective head in the case of a water turbine, and P (kW) in the lower part of the vertical axis in the figure indicates power in common. Further, the horizontal axis indicates the amount of water Q. A curve A is a QH performance curve of the pump, and a curve C is a shaft power curve when the water turbine is not operated. In the water supply system shown in FIG. 16, in order to operate only the pump 7 and supply the water quantity Q0, the total head H0 is required, and the operating point at this time is point O4 on the curve A. The power consumed at this time is L1 indicated by pump shaft power, and the operating point is the O1 point on the curve C. Curve B shows the effective head of the water wheel 9 (pressure head difference before and after the water wheel). When the amount of water Q0 flows, a pressure difference head (effective head) H1 is generated before and after the water wheel 9 to absorb this potential energy. This means that the following power L3 is generated.

  A curve D is a power curve when the pump 7 and the water wheel 9 are operated. When the amount of water is Q0, the power generated by the water wheel 9 is L3. In this case, the power recovery rate (L3 / L1) is about 20 to 30%. The operating point at this time is the point O2 on the curve D, and the consumed power is reduced by L3 with respect to L1, and becomes L2 indicated by pump shaft power. The energy corresponding to the power L2 is supplied from the commercial power supply 15 as electric power.

  Further, when the amount of water flowing into the water turbine becomes large, a plurality of the devices described above are operated in parallel.

  In addition, as a reference device, there is an example in which a potential energy recovery system for pumped water after passing through a heat source device is similarly configured and effectively used in a primary system of a regenerative air conditioning system. That is, the electric motor 2 that drives the pump 1 shown in FIG. 16 is used as both shafts, a water turbine 9 is connected to the opposite pump side, and the water from the heat source device 4 is received by the water turbine. Then, the torque generated by the water turbine is transmitted to the electric motor 2 to reduce the load on the electric motor 2 (in this case, the pump 1). Reference examples of this include Patent Document 1 (power recovery pump device), Patent Document 2 (power recovery pump device), and the like. Further, as a reference example of turbine power generation using a turbine in a waterway such as a dam or a paddy field, there is Patent Document 3 (outer ring drive turbine generator).

Japanese Patent Laid-Open No. 50-128801 JP 50-49701 A JP-A-5-10245

  However, in this reference technique, a clutch is used to connect the electric motor and the water wheel, and improvement of the transmission efficiency of this is a problem. Furthermore, in this case, there is a problem that the energy recovered by the water turbine is mechanical power and cannot be structurally used for other loads in the building.

  Therefore, an object of the present invention is to recover unused energy as electric power by water turbine power generation and reuse it.

  In addition, it is unreasonable to design and manufacture each device according to the height of the building (head of the water turbine) and the air conditioning load (flow rate) in the building. In general, several types of general-purpose devices are prepared in advance, and a plurality of units are operated in parallel according to the building or load equipment specifications.

  Further, the object of the present invention is to operate a plurality of general-purpose turbine generators installed in series or in parallel for equipment specifications (turbine specifications) such as buildings, dams, rivers, etc., and can be manufactured at low cost. An object is to provide a series operation, a parallel operation method and a control device for a power generator.

  In order to achieve the above object, a heat storage tank installed in the lower part of the building, a pumping pump of a secondary system that pumps up water from the heat storage tank and sends it to an air conditioning load group, a discharge port of the pump, A first water pipe provided between the air conditioning load group, a second water pipe returning the water discharged from the outlet of the air conditioning load group to the heat storage tank, and an uppermost part of the second water pipe An expansion tank or vacuum breaker valve provided in the turbine, a water turbine provided in a lower part of the second water supply pipe and capable of recovering potential energy of water discharged from the air conditioning load group, and torque generated by the water turbine A generator that is driven to rotate and generates electric power, an inverter that is connected to the output terminal of the generator and generates DC power, and a pump for the secondary system that receives the DC power from the inverter and converts it into AC power Supply system to the drive motor side A cooperation apparatus configured to provide.

The present invention is configured as described above and operates as follows.
1) Close the turbine inlet valve, outlet valve and turbine bypass valve before driving. First, the power supply for driving the secondary system pumping pump is turned on.
2) Next, an operation request signal is transmitted from the air conditioning load group to the pump.
3) The pump is operated by receiving an operation request signal transmitted from the air conditioning load group, and simultaneously transmits an operation answer signal to the generator.
4) After receiving the driving answer signal, open the water turbine inlet / outlet valve at a certain time. Along with this, the water turbine and the inverter operate. Gradually, the water turbine rotates and the generator starts.
5) The generated power is supplied to a load, for example, a pump for driving a pump, via an inverter.
6) The inverter takes the power of the generator, converts it into DC power, and transmits it to the system linkage device (regenerative converter device). The system linkage device (regenerative converter device) converts DC power taken from the inverter into AC and returns it to the power supply side.
7) The expansion tank or vacuum breaker valve is at the upper part of the water supply pipe and has an air release part or an equivalent function to prevent the water in the water supply pipe from expanding and to discharge the air in the pipe or , Help break the intake vacuum and drop the water to the turbine. In another embodiment, a pressure sensor provided near the water wheel detects the pressure here, and opens an automatic valve provided near the water wheel when the water pressure here exceeds a specified value.
<When stopped>
8) Water turbine outlet valve closed, water turbine stopped, generator stopped, inverter stopped, system linkage device stopped.
9) Stop the supply of generated power and stop the supply of power to loads such as the pump for driving the pumping pump of the secondary system.
10) A stop request signal is transmitted from the generator side to the pumping pump side of the secondary system.
11) Receive stop request signal, stop motor for driving pump of secondary side system, and return stop answer signal to generator.

  In addition, regarding the energy recovery device, in a power supply system having a plurality of loads, an inverter is provided at the output of a generator that recovers unused energy, and a system linkage device is provided between the inverter and the power supply, and the generator The generated power is returned to the power source, and the plurality of loads are operated so that the generated power of the generator can be shared. Alternatively, a control device that performs such operation control is provided.

  In addition, regarding the energy recovery apparatus, in a power supply system having a plurality of loads, a system in which a plurality of inverters are provided at the output of a generator that recovers unused energy, and which acts in common between the plurality of inverters and the power supply A linkage device is provided to return the generated power of the generator to the power source, and each load is operated so that the generated power of the generator can be shared. Alternatively, a control device that performs such operation control is provided.

  The present invention is configured as follows.

  A heat storage tank installed in the lower part of the building, a secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group, and a space between the discharge port of the pump and the air conditioning load group A first water pipe, a second water pipe that returns the water discharged from the outlet of the air conditioning load group to the heat storage tank, and an expansion tank or vacuum breaker valve provided at the top of the second water pipe And a turbine generator provided at a lower part of the second water pipe and capable of collecting the potential energy of water discharged from the air conditioning load group, and a DC power connected to an output end of the turbine generator. And a system linkage device that receives DC power from the inverter, converts it into AC power, and supplies the AC power to the pumping pump drive motor side of the secondary system, wherein the turbine generator generates the plurality of turbine generators. Install and operate devices in series or in parallel Configure and drive.

  In the above configuration, when the plurality of turbine generators are provided in series or in parallel, the following is performed.

  When the water amount of the equipment is Q, the head is H, the water amount Q0 of the turbine generator is Q0, and the effective head H0, the quotient is obtained by dividing the equipment head H by the effective head H0 of the turbine generator (the quotient at this time is n When there is a remainder, n is n + 1 if power can be generated with a surplus head, and n is n if power generation is not possible, and n turbine generators are installed in series. To do.

  Alternatively, when the water amount of the facility is Q, the head is H, the water amount Q0 of the turbine power generator is set to Q0, and the effective head H0, the water amount Q of the facility is divided by the water amount Q0 of the turbine power generator and the quotient is obtained ( n), if there is a surplus, n is n + 1 if power can be generated with a surplus amount of water, and n is n if power generation is not possible, and n turbine generators are installed in parallel. Try to drive.

The present invention is configured as described above and operates as follows.
1) When a plurality of turbine generators installed in series or in parallel are operated, electric power is generated based on the point of use.
2) Each generator-side inverter converts the electric power generated by the generator into direct-current power, and returns or supplies the direct-current power to the system linkage device via a cable.
3) The system linkage device returns from each inverter, or converts the supplied DC power into AC allowed by the power supply side and returns it to the power supply.

  Further, in controlling the plurality of turbine power generation devices, an inverter is provided for each of the plurality of turbine power generation devices, a system linkage measure is provided on the power source side of the inverter, and each DC voltage terminal P, N of the plurality of inverters The DC voltage terminals P and N of the system linkage measure are connected in common and controlled to return to the power source during power generation. Or the control apparatus which can perform the above control is comprised.

  Alternatively, a plurality of turbine power generators provided in a part capable of collecting the potential energy of water discharged from the air conditioning load group of the building, and an inverter for each of the plurality of turbine power generators, and system linkage measures are provided on the power source side of the inverter And the controller is configured to connect the DC voltage terminals P and N of the plurality of inverters in common with the DC voltage terminals P and N of the system linkage measure and to return to the power source during power generation.

  Moreover, a control apparatus is comprised so that the said some inverter and the said system | strain cooperation measure may be accommodated in a common control panel.

  As described above, according to the present invention, an effect of further improving the recovery efficiency can be obtained as compared with an unused energy recovery device using a conventional water wheel. Moreover, since it can respond to various loads, for example, unused energy of a building can be reused.

  Embodiments of the present invention will first be described with reference to FIGS.

  FIG. 1 shows a block diagram of a first embodiment of the present invention. This figure shows a pumping pump 7 in place of the general electric motor 31 (non-double-shaft electric motor) instead of the double electric motor 8 for the secondary side system of the heat storage type air conditioning system shown in FIG. 16 of the reference example. The turbine 9 is separated, and a generator 34 is attached to the turbine 9 (or an integrated type is included), and an inverter 35 is connected to the output end of the generator 34. Further, a system linkage device 36 (regenerative converter device) is provided, and the inverter 35, the system linkage device 36, and the motor 31 are connected to the motor 31 and the commercial power source 15 (commercial power source) that drive the pumping pump 7 via cables 40 and 41. 3 may be the same as 3). Further, the positive side DC terminal P and the negative side DC terminal N of the inverter 35 and the positive side DC terminal P and the negative side DC terminal N of the system linkage device 36 are connected via cables 38 and 39. The electric power generated by the generator 34 is converted to direct current by the inverter 35, converted to alternating current by the system linkage device 36, and fed back to the commercial power supply 15 side. 32 and 37 are watt-hour meters.

  The electric pump 31 for driving the pump of the secondary system is supplied with electric power from the commercial power supply 15 when the water turbine 9 is not operating. If the electric power generated by the generator 34 is insufficient when the water turbine 9 is operating, the electric power combined with the electric power of the commercial power supply 15 is used. When the generated power is surplus, the power is returned to the commercial power supply 15 via the P and N terminals of the inverter 35 and further via the system linkage device 36.

  In addition, since the apparatus or apparatus shown with the same symbol as FIG. 16 is the same, description is abbreviate | omitted. FIG. 1 shows a secondary system, and the primary system is not shown.

  FIG. 2 is a diagram showing operating characteristics of the pump and the water turbine of the first embodiment of the present invention. The same reference numerals as those in FIG. 17 indicate the same meanings and will not be described. In the case of the first embodiment of the present invention, the generated power L3 regenerated through the turbine 9-the generator 34-the inverter 35-the system linkage device 36 to cover the shaft power L1 when the water amount Q0 of the pump 7 is supplied; This is covered with electric power L2 from a commercial power source. Naturally, when the two-way valve 11 is throttled and the load of the pump 7 is reduced, the drive power of the electric motor 31 may be smaller than the generated power of the water turbine 9. In this case, electric power is fed back from the inverter 35 to the commercial power supply 15 side via the grid linkage device 36 through the path of the water turbine 9 -the generator 34 -the inverter 35 -the grid linkage device 36 -the commercial power supply 15. In the case of the above embodiment, the power recovery rate (L3 / L1) is about 40 to 60%, which is improved from the conventional energy recovery rate.

  A second embodiment will be described with reference to FIG. 1 and 16 have the same meaning as those shown in FIG. 1 and FIG. FIG. 3 shows only the secondary system, and the primary system is not shown. In the present embodiment, the power regeneration destination from the generator is changed from the pump 31 for driving the pump to the air conditioner group 10 with respect to the first embodiment. As shown in FIG. 3, the inverter 35 and the system linkage device 36 (regenerative converter device) are connected between the air conditioner group 10 and the commercial power source 42 (which may be the same as the commercial power sources 3 and 15). 41 to connect. Further, the DC terminals P and N of the inverter are connected to the DC terminals P and N of the system linkage apparatus via cables 38 and 39.

  When the water turbine 9 is not operating, power is supplied from the commercial power source 42 to the air conditioner group 10. If the power generated by the generator 34 is insufficient due to the load state of the air conditioner group 10 while the water turbine 9 is in operation, the power combined with the power of the commercial power supply 42 is covered. When there is a surplus in the generated power generated by the generator 34, the power is returned from the P and N terminals of the inverter 35 to the commercial power supply 42 via the system linkage device 36. Reference numeral 43 denotes a watt hour meter.

  A third embodiment will be described with reference to FIG. The components denoted by the same reference numerals as those in FIGS. 1, 3, and 16 have the same meanings and will not be described. FIG. 4 shows only the secondary system, and the primary system is not shown. In this embodiment, the power generated by the water wheel 9 is supplied to various load groups such as lighting in a building. In the figure, reference numeral 46 denotes various load groups such as lighting in the building. Reference numeral 45 denotes a power system switching means. If the power supply system switching means 45 is switched so that ca is connected, the load group 46 is connected to the commercial power source 44 (may be the same as the commercial power sources 3, 15, and 42), and c-b is connected. When switching is performed, the load group 46 is connected to the generator 9 side. That is, when the water turbine 9 is in operation, when the load state of the load group 46 is sufficient with the power generated by the generator 13, the power source switching means 45 is connected to the cb side to supply the generator power. When the generated power is insufficient, the power supply system switching means 45 is switched to the c-a side so that the power of the commercial power supply 44 is supplied.

  A fourth embodiment will be described with reference to FIG. The same reference numerals as those in FIGS. 1, 3, 4, and 16 have the same meanings and will not be described. FIG. 5 shows only the secondary system, and the primary system is not shown. This embodiment is a further improvement of the third embodiment. When the load of the load group 46 is large and the power generated by the generator 34 is insufficient, the power from the generator 34 and the commercial power supply 47 (commercial power 47 It may be the same as that of the power sources 3, 15, 42, 44). In FIG. 4, the load group 46 can be supplied from the generator 34 and the commercial power supply 47 to the load group 46, and an inverter 35 is connected to the generator 34, and the DC power of the inverter 35 is taken in. A system linkage device 36 that converts to alternating current and returns to the power source is connected between the commercial power source 47 and the load group 46. The system linkage device 36 and the inverter 35 are obtained by connecting the DC terminals P and N with cables 38 and 39, respectively. When the power generated by the generator 34 is insufficient, the power is supplied by this and the commercial power supply 47.

  A fifth embodiment will be described with reference to FIG. The figure shows an example in which the present invention is applied to a primary system of a heat storage type air conditioning system. A water wheel 9 is provided in the middle of a water pipe 18, gate valves 21 and 23 are provided before and after the water wheel 9, and A bypass pipe 48 and a gate valve 49 are provided. Further, a pressure gauge 50 and a pressure sensor 51 are provided on the inlet side of the water wheel 9, and a pressure gauge 52 and a pressure sensor 53 are provided on the outlet side of the water wheel 9. Thus, when maintaining the turbine 9, the generator 34 and related equipment, the gate valves 21 and 23 are closed, the gate valve 49 is opened, and the water supply that has passed through the heat source unit 4 is supplied to the turbine upper water supply pipe 18. The bypass pipe 48, the gate valve 49, and the water turbine lower water supply pipe 18 are flowed in this order and returned to the heat storage tank 16. If it does in this way, operation of heat source machine 4 is possible also at the time of maintenance of water turbine 9, generator 34, and the equipment related to this. This can be applied to the secondary system as well, and in this case, the air conditioner group 10 can be operated during maintenance of the water turbine 9, the generator 34, and related equipment. FIG. 7 shows these in a simplified manner. The pressure gauge, pressure sensor, inverter, system linkage device, etc. are not shown. Reference numerals 9, 21, 23, 34, 48, and 49 indicate that -1 and -2 are provided in the primary system and the secondary system, respectively.

  FIG. 8 is a power supply system diagram showing an example of connection of each device. ELB1 to ELB7 denote earth leakage breakers. Reference numerals 54-2 to 54-6 and 55-2 to 55-6 denote thermal magnetic contactors. 34-1 is a generator of the primary system, 34-2 is a generator of the secondary system, 35-1 is an inverter of the primary system, and 35-2 is an inverter of the secondary system. In FIG. 8, two sets of generators and inverters are provided corresponding to the embodiment of FIG. 7, and the P and N terminals of each inverter are connected to the P and N terminals of the system linkage device 36. In addition, since what is shown with the same code | symbol as FIGS. 1-7 and 16 shows the same meaning, description is abbreviate | omitted.

  A sixth embodiment will be described with reference to FIG. In this embodiment, although not shown, the operation and control procedures between the control devices of the air conditioner group 10, the motor 31 for driving the pumping pump of the secondary system, the generator 34, the inverter 35, and the load device are defined. , I tried to drive in cooperation with each other. FIG. 9 is a flowchart showing these operations and control procedures. That is, during operation, in step 1 of the figure, the turbine inlet valve is opened, the outlet valve is closed, and the turbine bypass valve is closed. In step 2, the power source of the pump 31 for driving the pump on the secondary system is turned on, and in step 3, an operation request signal is transmitted from the air conditioner group 10 to the pump 7 on the secondary system. In step 4, the pumping pump 7 of the secondary system receives the operation request signal, and the pumping pump drive motor 31 of the secondary system is operated. Thereafter, a driving answer signal is transmitted to the generator 34. In step 5, after receiving the driving answer signal, the water turbine outlet valve is opened after a certain period of time, and the water turbine is operated. As a result, the generator is operated to generate electric power. In step 6, the electric power generated by the generator 34 is supplied to each load. Next, when stopping, the water turbine outlet valve is closed in step 7 and the water turbine 9 is stopped. Thereby, the generator 34 stops. In step 8, the supply of generated power is stopped and the operation of the inverter 35 is stopped. Then, the supply of power to each load is stopped. In Step 9, a stop request signal is transmitted from the generator 34 side to the pumping pump 7 side, and the pumping pump 7 stops. Then, a stop answer signal is returned to the generator 34 side. In the present embodiment, the load of the generator 34 is described by taking the pumping pump drive motor 31 of the secondary system as an example. However, this load may be the air conditioner group 10 or the heat source unit 4, and Other loads such as lighting may be used. If the operation and control procedures are defined in this way, it is possible to perform linked operation satisfactorily so that each device can perform a predetermined performance and function without error. The operation signal, operation answer signal, stop answer signal, and the like are not shown, but are exchanged between control devices that control the air conditioner group, the pump, the pump for driving the pump, the generator, and the like.

  A seventh embodiment will be described with reference to FIG. In the present embodiment, the sixth embodiment is further improved to perform automatic cooperative operation. Accordingly, the gate valves 21, 23, and 49 in FIG. 6 are automatic valves. Although not shown, the operation and control procedures between the control devices of the heat source unit 4, the pumping pump drive motor 2 of the primary side system, the generator 34-1, the inverter 35-1, and the load equipment are defined, The system is designed to automatically cooperate with each other. FIG. 10 is a flowchart showing these operations and control procedures. During operation so that automatic operation and automatic operation can be performed, Step 5 for opening the water turbine inlet / outlet valve when the water turbine inlet pressure reaches a specified pressure or higher is added to FIG. 9, and the water turbine 9, the generator 34 and the related items are added. The equipment is operated automatically. Further, when the vehicle is stopped, in step 9, the water turbine inlet / outlet valve is closed to automatically stop the water turbine 9, the generator 34 and related devices. Since other operations are the same as those in FIG. 9, the description thereof is omitted. In this way, there is no risk of erroneous operation, and operation management is further facilitated.

  As an example of further improvement, as an open control condition of the water turbine inlet / outlet valve during operation, it is assumed that the heat source machine is operating and that the inlet pressure of the valve is higher than a specified pressure, and if both are established, the open control is performed. Like to do. In this way, the operation is ensured and the entire system operates in a coordinated manner.

  Next, an eighth embodiment of the present invention will be described with reference to FIGS.

  FIG. 11 shows a block diagram of an eighth embodiment (series operation) of the present invention. This figure shows how many turbine generators should be installed in series, shows how to install them, and applied both energy recovery systems to the primary system of the heat storage air conditioning system of the reference example. An electric motor corresponding to the shaft motor is installed as a general motor 202 (non-both shaft motor) by separating the pump and the water turbine. It is assumed that the water amount in the facility specification is Q0, the head is H, and the water wheel specification is the water amount Q0 and the effective head H0. That is, when the head H of the facility is divided by the effective head H0, n = 2 is a. This is as shown in FIG. As will be described in detail with reference to FIG. 13, since the power generation amount of the generator is less than one for the effective head a (the remainder a), two turbines are installed in series. The turbines 209-1 and 209-2 are respectively attached with generators 234-1 and 234-2 (or including an integrated type), and are described later at the output ends of the generators 234-1 and 234-2. 12, inverters 235-1 (INV1) and 235-2 (INV2) are attached, respectively. The terminals between P and N, which are the DC outputs of the DC intermediate circuits of these inverters, are connected to the P and N terminals of the DC circuit section of the system linkage device (regenerative converter) 236 with the commercial power supply 203 (PW). Connect to the terminal. Here, P and N represent DC voltages, where the positive DC voltage is P and the negative DC voltage is N. The electric power generated by the generators 234-1 and 234-2 flows as a regenerative current through the flywheel diode D of the inverters 235-1 and 235-2, and accumulates in the capacitor C. (For example, if the generated voltage of the generator is 200V AC, the voltage between the inverters P and N (DC voltage) is 280V.) Also, the amount of water flowing into the turbines 209-1 and 209-2 varies, and the generator 234 is changed. -1 and 234-2, when the generated power fluctuates, for example, the above-described voltage between P and N is detected, and every time the voltage falls below 280V, it is not shown. Braking is applied, and the voltage between P and N increases.

  Furthermore, the DC voltage terminals P and N of the inverters 235-1 and 235-2 and the P and N terminals of the system linkage device (regenerative converter) 236 are connected to each other by cables 238 and 239 (see FIG. 12), respectively. To do. If it does in this way, the generated electric power will be transmitted to the system cooperation device (the terminal between P and N of regenerative converter 236) with direct current, and will return to commercial power supply 203 through this.

  FIG. 12 is a circuit diagram illustrating the control device in relation to the configuration diagram of FIG. 11 described above. Since the apparatus or apparatus indicated by the same symbol as in FIG. 16 is the same, description thereof is omitted. In the figure, 203 (PW) is a power source, 232 (WH1) is a power meter that measures the amount of power purchased from the power company, and 243 (WH2) is a power meter that measures the amount of power sold to the power company. ELB1 to ELB3 are earth leakage circuit breakers. 255N is for a heat source machine, 255P is an electromagnetic switch for a pumping pump, 254N is for a heat source machine, 254P is a thermal relay for a pumping pump, 236 is a system linkage device (regenerative converter), and is generated on the load side It is used to adjust the regenerative energy to AC power that is acceptable on the power supply side and return it to the power supply side. 235-1 (INV1) is No. No. 1 generator side inverter, 235-2 (INV2) is No. 2 Generator side inverter 234-1 (G1) is No.2. No. 1 generator, 234-2 (G2) is No.1. Two generators. The load side terminals P and N of the system linkage device 236 are No. 1 and no. It is positioned above the two generator-side inverters 235-1 and 235-2, and P is connected to P and N is connected to N in common with the DC voltage terminals P and N of these inverters 235-1 and 235-2. That is, no. 1 and no. The electric power generated by the two generators is processed as direct current power by each inverter, and the system linkage device 236 converts this direct current power into alternating current power that can be allowed by the power source side and returns it to the commercial power source 203 side. Initially, since the turbines 209-1 and 209-2 and the generators 234-1 and 234-2 are not in operation, there is no supply of power from the inverters 235-1 and 235-2 DC voltage terminals P and N. A load group such as the pumping pump 201, the electric motor 202, or the heat source device 204 is operated only by supply from the commercial power source 203. When the pumping pump 201 is operated, water is supplied to the heat source unit 204, and when the water is used and the water returns to the turbines 209-1 and 209-2, the turbines 209-1 and 209-2 and the generator 234- respectively. 1 and 234-2 are operated, and DC power is supplied from the inverters 235-1 and 235-2 to the DC voltage terminals P and N of the system linkage device 236 via the cables 238 and 239. The system linkage device 236 converts these DC powers into specified AC powers and returns them to the commercial power source 203 side. The watt-hour meter 242 (WH2) measures the amount of power returned to the power source.

  FIG. 13 is a diagram showing operating characteristics of a pump and a water turbine according to an eighth embodiment of the present invention. The same reference numerals as those in FIG. 17 indicate the same meanings and will not be described. In the figure, the pump is operating with a water volume Q0 and a total head H3. The specification of the water wheel is a water amount Q0, the effective head is H0, and this characteristic is a curve F. That is, the water turbine generates power of S0 when a water amount Q0 and an effective head H0 are given. When this characteristic is shown, a curve G is obtained. When two of these water turbines are operated in series, the effective head is 2H0 and the characteristics are as shown by curve E. The power generated when two units are operated in series is 2SO, and the characteristic is curve I. In this case, as shown in the figure, there is a remainder of a in the head with respect to the head H of the equipment. When this is displayed on the effective head characteristic F during operation of one turbine, the water quantity Qa point is obtained at the Oa point. In this respect, the water turbine has little water and does not generate power. This indicates that the number of turbines may be two as shown in this example.

  FIG. 14 shows a block diagram of a ninth embodiment (parallel operation) of the present invention. This figure shows how many turbine generators should be installed in parallel, shows how to install them, and applied both energy recovery systems to the primary system of the regenerative air conditioning system of the reference example. An electric motor corresponding to the shaft motor is installed as a general motor 202 (non-both shaft motor) by separating the pump and the water turbine. It is assumed that the water amount in the facility specification is Q, the head is H0, and the water wheel specification is the water amount Q0 and the effective head H0. That is, when the water quantity Q of the facility is divided by the water turbine specification water quantity Q0, n = 2 is left as b. This is as shown in FIG. As will be described in detail with reference to FIG. 15, since the generator does not generate electricity with the water turbine specification water amount b (remainder b), two turbines are installed in parallel.

  FIG. 15 is a diagram showing operating characteristics of the pump and the water turbine according to the ninth embodiment of the present invention. The same reference numerals as those in FIG. 17 indicate the same meanings and will not be described. In the figure, the pump is operating with a water volume Q and a total head H3. The specification of the water wheel is a water amount Q0, the effective head is H0, and this characteristic (QH) is a curve F. The combined characteristic when two units are operated in parallel is a curve J. That is, the water turbine generates power of S0 when a water amount Q0 and an effective head H0 are given. When this characteristic is shown, a curve G is obtained. When two of these water turbines are operated in parallel, the amount of water is 2Q0 and the effective head is H0. This characteristic is represented by a curve G ′ when the curve G is moved in parallel and Q0 is expressed as a starting point. Further, curves I and G 'are synthesized, and the synthesis characteristic is shown as curve I with the O2 point as the starting point. This indicates that the generated power when two units are operated in parallel is 2S0 at 01 points. In this case, as shown, there is a remainder of b in the amount of water relative to the amount of water Q in the facility. When this is displayed on the effective head characteristic F during operation of one turbine, the point Qb is the water amount Qb. In this respect, the water turbine has little water and does not generate power. This indicates that the number of turbines may be two as shown in this example.

  In the above embodiment, the electric power generated by a plurality of generators is sent to the system linkage device by direct current, and is converted into alternating current power and returned to the power supply side. Any load can be applied to various loads. Further, even if a plurality of turbine generators are installed in series or in parallel, these control devices can be shared without change.

  Moreover, since the P and N terminals of the DC circuit of the inverter on the generator side and the system linkage device are connected by a cable, the wiring loss increases as this becomes longer. Both can be stored in the same control panel. This can be improved.

  Moreover, although the description of the said Example demonstrated the case where it applied to the primary system of a thermal storage type | formula air conditioning system, this invention is applicable similarly to a secondary system.

  Moreover, according to the embodiment based on the present invention as described above, a plurality of general-purpose water turbine generators are prepared in advance for various equipment specifications, and a plurality of units are installed in series or in parallel. Therefore, design man-hours are not required, manufacturing costs are low, and quick delivery is possible.

It is a figure which shows 1st Example by this invention. It is a figure which shows the driving | operation characteristic figure of the pump and water turbine of 1st Example by this invention. It is a figure which shows 2nd Example by this invention. It is a figure which shows 3rd Example by this invention. It is a figure which shows 4th Example by this invention. It is a partial block diagram which shows 5th Example by this invention. It is a block diagram of 5th Example by this invention. It is the figure which showed an example of the connection of each apparatus by this invention. It is a flowchart which shows the operation and control procedure of 6th Example by this invention. It is a flowchart which shows the operation and control procedure of 7th Example by this invention. It is a figure which shows 8th Example by this invention. It is a circuit diagram explaining the control apparatus in relation to the block diagram of 8th Example by this invention. It is a driving characteristic figure of the 8th example by the present invention. It is a figure which shows 9th Example by this invention. It is a driving characteristic figure of the 9th example by the present invention. It is a figure which shows the thermal storage type | formula air conditioning system of a reference example. It is a figure which shows the operating characteristic figure of the pump and water turbine of the thermal storage type | formula air conditioning system of a reference example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Primary system pumping pump 2 ... Primary system pumping pump drive motor 3 ... Commercial power supply 4 ... Heat source machine 5 ... Two-way valve 6 ... Expansion tank 7 ... Secondary system pumping pump 8 ... Secondary system pumping pump Electric motor for driving 9 ... Water wheel 10 ... Air conditioning load group 11 ... Two-way valve 12 ... Expansion tank 13 ... Clutch 14 ... Shaft coupling 15 ... Commercial power supply 16 ... Thermal storage tank 17 ... Water supply pipe 18 ... Water supply pipe 19 ... Water supply pipe 20 ... Supply pipe Water pipe 21 ... Gate valve 22 ... Gate valve 23 ... Gate valve 24 ... Water supply pipe 25 ... Gate valve 26 ... Gate valve 27 ... Check valve 28 ... Check valve 29 ... Foot valve 30 ... Foot valve 31 ... Electric motor 32 ... Electric energy Total 33 ... Connection point 34 ... Generator 35 ... Inverter 36 ... System linkage device 38 ... Cable 39 ... Cable 40 ... Cable 41 ... Cable 42 ... Commercial power supply 43 ... Electricity meter 44 ... Commercial Power 45 ... power supply system switching unit 46 ... load group 47 ... utility power 48 ... Bypass pipe 49 ... gate valve 50 ... pressure gauge 51 ... pressure sensor 52 ... a pressure gauge 53 ... pressure sensor, 55 ... thermal with magnet contactor

Claims (40)

A heat storage tank,
A pump for feeding water from the heat storage tank to the air conditioning load;
A first water pipe provided between a discharge port of the pump and the air conditioning load;
A second water pipe that returns water discharged from the discharge port of the air conditioning load to the heat storage tank;
A water wheel provided in the second water pipe;
An energy recovery apparatus comprising a generator for generating electric power by the water wheel. The energy recovery device according to claim 1,
An inverter connected to the generator to generate DC power;
An energy recovery apparatus comprising: a system linkage device that receives DC power from the inverter, converts it into AC power, and supplies the AC power to a load. The energy recovery device according to claim 2,
An energy recovery apparatus characterized in that the DC terminals P and N of the inverter are connected to the DC terminals P and N of the system linkage apparatus. The energy recovery device according to claim 1,
An inverter connected to the generator to generate DC power;
An energy recovery apparatus comprising: a system linkage device that receives DC power from the inverter, converts the DC power into AC power, and supplies the AC power to the pump for driving the pump. The energy recovery device according to claim 1,
The energy recovery device, wherein the load is an air conditioning load.   The energy recovery apparatus according to claim 3, wherein the load is a lighting load in a building. The energy recovery device according to claim 2,
The energy recovery apparatus according to claim 1, wherein a power supply side of the system linkage apparatus is connected to a commercial power supply side, and a power supply side of the inverter is connected to a power supply side electric circuit connecting the load and the commercial power supply side. The energy recovery device according to claim 1,
An energy recovery apparatus for a building, wherein the power generated by the generator is supplied to a load in the building. The energy recovery device according to claim 1,
An energy recovery apparatus comprising switching means for selecting electric power from a commercial power source and electric power from the generator and supplying the electric power to a load in a building. The energy recovery device according to claim 1,
An inverter connected to the output end of the generator to generate DC power;
An energy recovery apparatus comprising: a system linkage device that receives DC power from the inverter, converts it into AC power, and supplies the AC power to a load. The energy recovery device according to claim 1, wherein
A bypass pipe that bypasses the water wheel, and a valve provided in the middle of the bypass pipe,
An energy recovery apparatus, wherein a pressure sensor is provided at the water turbine entrance. The energy recovery device of claim 1,
An energy recovery device, wherein the second water supply pipe is provided with an expansion tank or a vacuum break valve. A heat storage tank,
A pump for feeding water from the heat storage tank to the air conditioning load;
A first water pipe provided between a discharge port of the pump and the air conditioning load;
A second water pipe returning from the discharge port of the air conditioning load to the heat storage tank;
A water wheel provided in the second water pipe;
A generator for generating electric power by the water wheel;
In the energy recovery apparatus which supplies the electric power generated by the generator to a load, the energy recovery apparatus is operated according to the following procedure.
<During operation>
1. Closed water turbine bypass valve.
2. Turn on pump pump motor.
3. A pumping pump operation request signal is sent from the generator side.
4). After receiving the operation answer signal, the pump operates in a certain time.
5). When the turbine inlet pressure reaches the specified pressure, the turbine inlet / outlet automatic valve is opened and the turbine is operated. Along with this, the generator operates.
6). Supply generated power to each load.
<When stopped>
1. Water wheel entrance automatic valve closed, water turbine stopped. Generator stopped.
2. Stops the supply of generated power and stops the supply of power to the pump for driving the pump.
3. A stop request signal is sent from the generator side to the pump. Stop.
4). Request signal received, pumping pump drive motor stopped, stop answer signal sent back to generator.   14. The water turbine inlet / outlet automatic valve is fully opened when the generator is operated and a pressure sensor provided on an inlet side of the turbine detects a specified pressure as the inlet side pressure of the turbine. How to operate the energy recovery system. A heat storage tank,
A pump for feeding water from the heat storage tank to the air conditioning load;
A first water pipe provided between the pump and the air conditioning load;
A second water pipe that returns water discharged from the discharge port of the air conditioning load to the heat storage tank;
A turbine generator provided in the second water pipe;
An inverter connected to the turbine generator for generating DC power;
A system linkage device that receives DC power from the inverter, converts it to AC power and supplies it to a load, and
The water turbine generator has the plurality of water turbine generators installed in series or in parallel. The energy recovery device according to claim 15,
When the water volume of the equipment is Q, the head is H, the water volume Q0 of the turbine generator is Q0, and the effective head H0, the quotient n is obtained by dividing the equipment head H by the effective head H0 of the turbine power generator. In this case, n is n + 1 when power generation is possible due to the remaining head, and n is n when power generation is impossible, and n water turbine power generation devices are installed in series. The energy recovery device according to claim 15,
When the amount of water in the facility is Q, the head is H, the amount of water Q0 of the turbine generator is Q0, and the effective head is H0, the quotient n is obtained by dividing the amount of water Q of the facility by the amount of water Q0 of the turbine generator. In this case, n is n + 1 when power generation is possible with a surplus amount of water, and n is n when power generation is impossible, and n water turbine power generation devices are installed in parallel. A heat storage tank installed at the bottom of the building;
A secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group;
A first water pipe provided between a discharge port of the pump and the air conditioning load group;
A second water pipe for returning water discharged from the discharge port of the air conditioning load group to the heat storage tank;
An expansion tank or vacuum breaker valve provided at the top of the second water pipe;
A water turbine provided at a lower part of the second water pipe and provided at a site where the potential energy of water discharged from the air conditioning load group can be collected;
A generator that generates electric power that is rotationally driven by the torque generated by the water wheel;
An inverter connected to the output end of the generator to generate DC power;
An energy recovery apparatus comprising: a system linkage device that receives DC power from the inverter, converts the DC power into AC power, and supplies the AC power to a pumping pump driving motor side of the secondary system.   19. The energy recovery apparatus according to claim 18, wherein the DC terminals P and N of the inverter are connected to the DC terminals P and N of the system linkage apparatus by a cable. A heat storage tank installed at the bottom of the building;
A secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group;
A first water pipe provided between a discharge port of the pump and the air conditioning load group;
A second water pipe for returning water discharged from the discharge port of the air conditioning load group to the heat storage tank;
An expansion tank or vacuum breaker valve provided at the top of the second water pipe;
A water turbine provided at a lower part of the second water pipe and provided at a site where the potential energy of water discharged from the air conditioning load group can be collected;
A generator that generates electric power that is rotationally driven by the torque generated by the water wheel;
An inverter connected to the output end of the generator to generate DC power;
An energy recovery apparatus comprising: a system linkage device that receives DC power from the inverter, converts the DC power into AC power, and supplies the AC power to a load group.   21. The energy recovery apparatus according to claim 20, wherein the DC terminals P and N of the inverter are connected to the DC terminals P and N of the system linkage apparatus by a cable.   The energy recovery apparatus according to claim 20, wherein the load group is an air conditioning load group.   21. The energy recovery apparatus according to claim 20, wherein the load group is a lighting load group in a building.   24. The power source side of the system linkage apparatus is connected to a commercial power source side, and the power source side of the inverter is connected to a power source side electric circuit connecting the load group and the commercial power source side. Energy recovery equipment.   A heat storage tank installed in the lower part of the building, a secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group, and a space between the discharge port of the pump and the air conditioning load group A first water pipe, a second water pipe that returns the water discharged from the outlet of the air conditioning load group to the heat storage tank, an expansion tank or a vacuum breaker valve provided at the top of the second water pipe, A water turbine provided at a lower part of the second water pipe and capable of recovering potential energy of water discharged from the air conditioning load group; and a generator that is driven to rotate by torque generated by the water turbine to generate electric power; An energy recovery device for a building, wherein the power generated by the generator is supplied to a load group in the building. A heat storage tank installed at the bottom of the building;
A secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group;
A first water pipe provided between a discharge port of the pump and the air conditioning load group;
A second water pipe for returning water discharged from the discharge port of the air conditioning load group to the heat storage tank;
An expansion tank or vacuum breaker valve provided at the top of the second water pipe;
A water turbine provided at a lower part of the second water pipe and provided at a site where the potential energy of water discharged from the air conditioning load group can be collected;
A generator that generates electric power that is rotationally driven by the torque generated by the water wheel;
An energy recovery apparatus for a building, comprising switching means for selecting electric power from a commercial power source and electric power from the generator and supplying the electric power to a load group in the building. A heat storage tank installed at the bottom of the building;
A secondary cold / hot water pump that pumps water (heat) from the heat storage tank and sends it to an air conditioning load group;
A water pipe provided between the discharge port of the secondary cold / hot water pump and the air conditioning load group;
A water pipe returning from the outlet of this air conditioning load group to the heat storage tank;
An expansion tank or vacuum breaker valve provided at the top of this water pipe;
A water wheel provided at a lower part of the water pipe and provided at a site where the potential energy of water discharged from the air conditioning load group can be collected;
A generator that is driven to rotate by the torque generated by the water turbine to generate electric power;
An inverter connected to the output end of the generator to generate DC power;
An energy recovery apparatus comprising: a system linkage device that receives DC power from the inverter, converts the DC power into AC power, and supplies the AC power to a load group.   The energy recovery device according to any one of claims 18 to 27, wherein a bypass pipe that bypasses the water turbine, a valve is provided in the middle of the bypass pipe, and a pressure sensor is provided at the water turbine inlet / outlet. A heat storage tank installed in the lower part of the building, a pump on the secondary system that pumps water from the heat storage tank and sends it to the air-conditioning load group, and between the discharge port of the pump and the air-conditioning load group A first water pipe provided, a second water pipe returning from the discharge port of the air conditioning load group to the heat storage tank, an expansion tank or a vacuum breaker valve provided at the top of the second water pipe, and the second water feed pipe. A water turbine provided in a lower part of the water pipe and capable of collecting the potential energy of water discharged from the air conditioning load group; a generator that is driven by torque generated by the water turbine to generate electric power; and In the energy recovery apparatus in a building, wherein the power is supplied to loads such as the pumping pump, the air conditioning load group, and the lighting of the machine room, the energy recovery apparatus in which each device operates in accordance with the following procedure of The rolling method.
<During operation>
1. Turbine inlet valve open, outlet valve closed, water turbine bypass valve closed.
2. Turn on the motor for driving the pump.
3. A pumping pump operation request signal is sent from the air conditioning load side.
4). Operation request signal reception, pumping pump drive motor operation, operation answer signal is transmitted to the generator side.
5). After receiving the driving answer signal, the turbine exit valve opens and the turbine runs after a certain period of time. Generator operation.
6). Supply generated power to each load.
<When stopped>
1. Closed the water wheel exit valve and stopped the water wheel. Generator stopped.
2. Stops supply of generated power and power supply to each load.
3. A stop request signal is sent from the generator side to the pump. The pump stopped. A heat storage tank installed in the lower part of the building, a water pump of a secondary system that pumps water from the heat storage tank and sends it to the air conditioning load group, and between the discharge port of the pump and the air conditioning load group A first water pipe provided, a second water pipe returning from the discharge port of the air conditioning load group to the heat storage tank, an expansion tank or a vacuum breaker valve provided at the top of the second water pipe, and the second water feed pipe. A water turbine provided in a lower part of the water pipe and capable of collecting the potential energy of water discharged from the air conditioning load group; a generator that is driven by torque generated by the water turbine to generate electric power; and In the energy recovery device in a building, wherein the power is supplied to the pump such as the pump, the air conditioning load group, and the lighting of the machine room, the energy that each device automatically operates in accordance with the following procedure Times Way operation of the apparatus.
<During operation>
1. Closed water turbine bypass valve.
2. Turn on pump pump motor.
3. A pumping pump operation request signal is sent from the generator side.
4). After receiving the operation answer signal, the pump operates in a certain time.
5). When the turbine inlet pressure reaches the specified pressure, the turbine inlet / outlet automatic valve is opened and the turbine is operated. Along with this, the generator operates.
6). Supply generated power to each load.
<When stopped>
1. Water wheel entrance automatic valve closed, water turbine stopped. Generator stopped.
2. Stops the supply of generated power and stops the supply of power to the pump for driving the pump.
3. A stop request signal is sent from the generator side to the pump. Stop.
4). Request signal received, pumping pump drive motor stopped, stop answer signal sent back to generator.   31. The water turbine inlet / outlet automatic valve is fully opened when the generator is operated and a pressure sensor provided on an inlet side of the turbine detects a specified pressure on the inlet side of the turbine. Operation method of energy recovery equipment.   In a power supply system having a plurality of loads, an inverter is provided at the output of a generator that recovers unused energy, and a system linkage device is provided between the inverter and the power supply to return the generated power of the generator to the power supply. An operation control device for an energy recovery device, wherein a plurality of loads can use the power generated by the generator in common.   In a power supply system having a plurality of loads, a plurality of inverters are provided at the output of a generator that recovers unused energy, and a system linkage device that acts in common between the plurality of inverters and the power supply is provided. An operation control device for an energy recovery apparatus, wherein the generated power is fed back to a power source so that a plurality of loads can use the generated power of the generator in common. A heat storage tank installed at the bottom of the building;
A secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group;
A first water pipe provided between a discharge port of the pump and the air conditioning load group;
A second water pipe for returning water discharged from the discharge port of the air conditioning load group to the heat storage tank;
An expansion tank or vacuum breaker valve provided at the top of the second water pipe;
A turbine generator provided at a lower portion of the second water pipe and provided at a portion where the potential energy of water discharged from the air conditioning load group can be collected;
An inverter connected to the output end of the turbine generator for generating DC power;
A system linkage device that receives DC power from the inverter, converts it into AC power, and supplies it to the pumping pump drive motor side of the secondary system; and
The water turbine generator includes the plurality of turbine power generators installed in series.   When the amount of water in the facility is Q, the head is H, the amount of water Q0 of the turbine generator is Q0, and the effective head H0 is divided by the effective head H0 of the turbine generator, the quotient n is obtained. In this case, n is set to n + 1 when power generation is possible with a surplus head, and n is set to n when power generation is impossible, and n turbine generators are installed in series and operated. Item 2. A method for series operation of a plurality of turbine generators according to item 1. A heat storage tank installed at the bottom of the building;
A secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group;
A first water pipe provided between a discharge port of the pump and the air conditioning load group;
A second water pipe for returning water discharged from the discharge port of the air conditioning load group to the heat storage tank;
An expansion tank or vacuum breaker valve provided at the top of the second water pipe;
A turbine generator provided at a lower portion of the second water pipe and provided at a portion where the potential energy of water discharged from the air conditioning load group can be collected;
An inverter connected to the output end of the turbine generator for generating DC power;
A system linkage device that receives DC power from the inverter, converts it into AC power, and supplies it to the pumping pump drive motor side of the secondary system; and
The water turbine generator includes the plurality of turbine power generators installed in parallel.   When the amount of water in the facility is Q, the head is H, the amount of water Q0 of the turbine generator is Q0, and the effective head is H0, the amount of water Q of the facility is divided by the amount of water Q0 of the turbine generator and the quotient n is obtained. In this case, n is set to n + 1 when power generation is possible with a surplus amount of water, and n is set to n when power generation is not possible, and n water turbine generators are installed and operated in parallel. 36. A parallel operation method of a plurality of turbine generators according to 36. A heat storage tank installed at the bottom of the building;
A secondary system pump for pumping water from the heat storage tank and sending it to the air conditioning load group;
A first water pipe provided between a discharge port of the pump and the air conditioning load group;
A second water pipe for returning water discharged from the discharge port of the air conditioning load group to the heat storage tank;
An expansion tank or vacuum breaker valve provided at the top of the second water pipe;
A plurality of water turbine generators provided in a lower part of the second water pipe and provided in a portion where the potential energy of water discharged from the air conditioning load group can be collected;
An inverter is provided for each of the plurality of turbine generators, a system linkage measure is provided on the power source side of the inverter, and each DC voltage terminal P, N of the plurality of inverters and DC voltage terminals P, N of the grid linkage measure are Are connected in common to return to the power source during power generation. A plurality of turbine generators installed in a site where the potential energy of water discharged from the air conditioning load group of the building can be collected;
An inverter is provided for each of the plurality of turbine generators, and a system linkage measure is provided on the power source side of the inverter. Each DC voltage terminal P, N of the plurality of inverters and a DC voltage terminal P, N of the grid linkage measure are provided. Are connected in common and returned to the power source during power generation.   40. The control device for a plurality of turbine generators according to claim 39, wherein the plurality of inverters and the system linkage measure are housed in a common control panel.

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