JP2015129591A - Trial operation method of cogeneration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trial operation method of a cogeneration system capable of smoothly implementing a trial operation of a thermoelectric cogeneration device and a trial operation of a hot water storage unit, even when at least one of a water supply source and a drainage destination of the cogeneration system has a temporary state.SOLUTION: A trial operation method of a cogeneration system includes a first trial operation process for recovering heat discharged from a thermoelectric cogeneration device by utilizing hot water supplied from a water supply source, simultaneously with a trial operation of the thermoelectric cogeneration device when at least one of the water supply source for supplying hot water to the cogeneration system and a drainage destination to which the hot water is discharged from the cogeneration system has a temporary state before a permanent state, and a second trial operation process for implementing a trial operation of a hot water storage unit after both of the water supply source and the drainage destination have the permanent states.

Description

  The present invention relates to a trial operation method for a cogeneration system including a combined heat and power device that generates heat and electricity together with a hot water storage unit having a hot water storage tank for storing hot water.

  2. Description of the Related Art Conventionally, there is a cogeneration system including a cogeneration device that generates heat and electricity together and a hot water storage unit having a hot water storage tank for storing hot water. In such a cogeneration system, the hot water stored in the hot water storage tank is used to recover the heat generated and discharged from the combined heat and power supply device, thereby cooling the combined heat and power supply device and storing the heat in the hot water storage tank. It is the composition which can be done together. For example, the cogeneration system has an exhaust heat recovery path through which hot water extracted from the hot water tank outlet returns to the return port of the hot water tank, and is located in the middle of the exhaust heat recovery path. A heat recovery unit is provided for recovering heat discharged from the combined heat and power supply by hot water flowing through the exhaust heat recovery path.

  Patent Literature 1 describes a test operation method for confirming whether or not the cogeneration system having such a configuration operates normally. In this trial operation method, first, hot water is supplied to the hot water storage tank until the hot water storage tank is full, and then hot water is passed from the full hot water storage tank to the exhaust heat recovery path. Then, based on the temperature of the hot water flowing through the exhaust heat recovery path, it is determined whether or not the cogeneration system is operating normally (specifically, whether or not the piping is erroneously connected). .

JP 2012-225589 A

When performing the trial operation of the combined heat and power device, it is necessary to collect the heat discharged from the combined heat and power device (that is, cool the combined heat and power device). Therefore, in order to perform a trial operation of the combined heat and power supply device, it is necessary to prepare at least an amount of hot water that can be continuously supplied to the above-described heat recovery unit, and supply and drain water.
Similarly, when performing a trial operation of the hot water storage unit, it is necessary to create a state in which the hot water flow path in the hot water storage unit including the hot water storage tank is filled with hot water. Therefore, in order to perform a trial operation of the hot water storage unit, it is necessary to supply and drain water by preparing hot water in an amount sufficient to fill the hot water flow path in the hot water storage unit including at least the hot water storage tank.

  However, the trial operation of the combined heat and power supply device and the hot water storage unit may not be performed smoothly due to problems with the water supply source and the drainage destination. For example, cogeneration systems are often installed during construction of dwelling units and facilities. In such a case, the trial operation of the cogeneration system is also performed during the construction of the dwelling unit or facility where the cogeneration system is installed. In addition, when a dwelling unit or a facility is in the middle of construction, a water supply facility as a water supply source or a sewage facility as a drainage destination is not necessarily completed in the dwelling unit or facility. That is, at least one of the water supply source and the drainage destination of the cogeneration system may be in a temporary state. In the temporary state as used herein, for example, a temporarily installed water tank or the like is used as a temporary water supply source or drainage destination as a substitute for water supply facilities or sewage facilities. If the cogeneration system is commissioned in such a state, water may be insufficient when hot water is supplied from the temporary water supply source to the hot water storage tank, or water is drained from the hot water storage tank to the temporary drainage destination. There is a possibility that the water will overflow when you do.

  In particular, in a housing complex or the like, since it is necessary to install a large number of cogeneration systems, the above problem that may occur when the water supply source and the drainage destination are in a temporary state becomes significant. In addition, you may perform a test run before a resident moves into the apartment house etc. after both a water supply source and a drainage destination become a permanent installation state. However, the period from when the water supply source and the drainage destination are in the permanent state to when the residents move in is short. Therefore, there is a possibility that a large number of man-made necessary for completing the trial operation of the combined heat and power supply device and the hot water storage unit in all the dwelling units or the like in the short term may not be prepared. Further, even if a trial operation of the combined heat and power supply device and the hot water storage unit is performed while there is enough time, at least one of the water supply source and the drainage destination of the cogeneration system must be in a temporary state. As a result, as described above, the problem that water supply may be insufficient or water may overflow during drainage cannot be solved.

  In the first place, as described in Patent Document 1, if a trial run is performed after filling the hot water tank with hot water, the time required for filling the hot water tank with the hot water becomes long, or after the trial run is completed. There is also a problem that the time required for discharging hot water from the hot water storage tank becomes long.

  The present invention has been made in view of the above problems, and its purpose is to perform trial operation and hot water storage of a combined heat and power device even if at least one of a water supply source and a drainage destination of a cogeneration system is in a temporary state. The object is to provide a method of trial operation of a cogeneration system that can smoothly perform a trial operation of a unit.

In order to achieve the above object, the cogeneration system according to the present invention is characterized in that a cogeneration system includes a cogeneration device that generates both heat and electricity, and a hot water storage unit having a hot water storage tank for storing hot water. A system test run method,
When at least one of a water supply source for supplying hot water to the cogeneration system and a drainage destination from which the hot water is discharged from the cogeneration system is in a temporary state before the main installation state, the trial operation of the cogeneration device And recovering the heat discharged from the combined heat and power supply device using hot water supplied from the water supply source, and during the trial operation of the combined heat and power supply device or during the trial operation of the combined heat and power supply device A first test operation step of discharging hot water used for recovery of heat discharged from the combined heat and power supply device to a drainage destination after completion;
And a second test operation step of performing a test operation of the hot water storage unit after both the water supply source and the drainage destination are in the main installation state. In the present application, the “temporary state” is a state in which a temporary water supply source (water supply facility) or a temporary drainage destination (sewage facility) is used. Therefore, the total amount of hot water that can be supplied is less than that in the case of the main installation, or the amount of hot water that can be supplied per unit time is less than in the case of the main installation. The total amount of hot water that can be drained without overflowing water is less than when it is in the installed state, and the amount of hot water that can be drained per unit time without overflowing is less than when it is in the installed state. Can occur.

Since the hot water storage tank is configured to store a large amount of hot water, there may be a shortage of hot water to fill the hot water storage tank when the water supply source is still in a temporary state, and the drainage destination is still in a temporary state. In some cases, the hot water discharged from the hot water storage tank may overflow from the temporary drainage destination, and therefore the trial operation of the cogeneration system may not be performed smoothly.
Therefore, in this characteristic configuration, the hot water storage unit is trial-run after both the water supply source and the drainage destination are in the permanent installation state (second trial operation step). That is, there is no shortage of hot water to fill the hot water storage tank when the water supply source is in the permanent state, and hot water discharged from the hot water storage tank does not overflow when the drainage destination is in the permanent state.

In addition, if trial operation of a combined heat and power supply device is performed, it is sufficient that at least heat recovery from the combined heat and power supply device (that is, cooling of the combined heat and power supply device) is performed. It may be less.
Therefore, in this feature configuration, when at least one of the water supply source and the drainage destination is in the temporary state, that is, before both the water supply source and the drainage destination are in the permanent installation state, the combined operation of the thermoelectric generator is performed (No. 1). 1 trial operation process). That is, since the trial operation of the combined heat and power supply device can be performed with a relatively small amount of hot water, even if the water supply source is in a temporary state (that is, in a state where a large amount of hot water cannot be supplied from the water supply source). Even if there is no trouble in the trial operation of the combined heat and power device, even if the drainage destination is in a temporary state (that is, even if a large amount of hot water cannot be discharged to the drainage destination) There is no problem with the trial run.

As described above, in this feature configuration, a timing with a relatively large time margin until a resident enters the dwelling unit or facility where the cogeneration system is installed (at least one of the water supply source and the drainage destination is temporarily installed). Because the trial operation of the combined heat and power system is performed at the timing that is in the state), the time margin until the residents move into the dwelling unit or facility where the cogeneration system is installed is relatively small (water supply source and At the timing when both drainage destinations are in a fully installed state, only a hot water storage unit test operation needs to be performed. Therefore, compared with the case where both the trial operation of the combined heat and power unit and the trial operation of the hot water storage unit have to be performed after both the water supply source and the drainage destination are in the main installation state, it is possible to secure a large time margin for the trial operation. In addition, there is little artificial work.
Therefore, even if at least one of the water supply source and the drainage destination of the cogeneration system is in a temporary state, a test operation method of the cogeneration system that can smoothly perform the test operation of the combined heat and power supply device and the test operation of the hot water storage unit is provided. it can.

Another characteristic configuration of the test operation method of the cogeneration system according to the present invention is that the cogeneration system is configured such that the hot water supplied from the water supply source to the hot water storage tank and extracted from the hot water storage tank outlet is again the hot water storage. An exhaust heat recovery path that flows while returning to the return port of the tank is provided, and hot water flowing through the exhaust heat recovery path is discharged from the heat and power supply device in the middle of the exhaust heat recovery path. A heat recovery unit that recovers heat
In the first trial operation step, the hot water storage tank is not filled with hot water, a trial operation of the heat and power supply device is performed, and hot water is allowed to flow through the heat recovery section of the exhaust heat recovery path, thereby the heat and power supply device. Recovering the heat exhausted from
In the second test operation step, the hot water storage unit is filled with hot water and the hot water storage unit is tested.

According to the above characteristic configuration, the first trial operation step that is performed when at least one of the water supply source and the drainage destination is in a temporary state is performed without filling the hot water storage tank with hot water. In other words, the first trial operation step that needs only to perform at least heat recovery from the combined heat and power device (that is, cooling the combined heat and power device) is performed using a relatively small amount of hot water. As a result, the time required to supply hot water to the hot water storage tank can be shortened. Moreover, it is possible to further reduce the possibility that the temporary water supply source will run out of water or the temporary drainage will overflow.
In addition, the second test operation step that is performed when both the water supply source and the drainage destination are in the main installation state is performed by filling the hot water storage tank with hot water. As a result, it is possible to perform a test operation to confirm the operation state of the hot water storage unit when the hot water storage tank is filled with hot water.

  Still another characteristic configuration of the test operation method of the cogeneration system according to the present invention is used in the first test operation step to recover the heat discharged from the heat and power supply device after the test operation of the heat and power supply device is completed. The hot water is discharged to the drainage destination.

If the hot water used in the first trial operation process remains in the cogeneration system and is left until the second trial operation process is performed, the hot water may freeze and damage pipes, etc. There is a possibility of germs breeding.
However, in this feature configuration, in the first trial operation step, the hot water is frozen until the second trial operation step is started by discharging the hot water to the drainage destination after the trial operation of the combined heat and power supply apparatus is completed. It is possible to prevent problems such as the fact that the bacterium is propagated and bacteria are propagated.

Still another characteristic configuration of the test operation method of the cogeneration system according to the present invention is that a heat recovery unit that recovers heat discharged from the cogeneration device using hot water flowing through the cogeneration system. Is provided,
In the first test operation step, the combined heat and power supply device is tested and the hot water supplied from the water supply source without passing through the hot water storage tank is allowed to flow to the heat recovery unit from the combined heat and power supply device. The point is to recover the exhausted heat.

  According to the above characteristic configuration, in the first trial operation step, the hot water supplied from the water supply source without passing through the hot water storage tank is passed through the heat recovery unit. That is, the use of a hot water storage tank can be avoided. As a result, it becomes unnecessary to discharge hot water from the hot water storage tank, which is necessary when the hot water storage tank is used.

It is a figure which shows the structure of the cogeneration system with which the trial run method of 1st Embodiment is performed. It is a flowchart explaining the test run method of a cogeneration system. It is a flowchart explaining a 1st trial run process. It is a flowchart explaining a 2nd trial run process. It is a figure which shows the structure of the cogeneration system with which the trial run method of 2nd Embodiment is performed. It is a figure explaining the derivation method of the 2nd standard amount of hot water in the trial run method of a 2nd embodiment. It is a figure which shows the structure of the cogeneration system with which the trial run method of 3rd Embodiment is performed.

<First Embodiment>
A test operation method for a cogeneration system according to the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a cogeneration system in which the test operation method according to the first embodiment is performed. In the present embodiment, in the cogeneration system shown in FIG. 1, a test operation method for the cogeneration system according to the present invention is performed. As shown in the figure, the cogeneration system includes a combined heat and power supply device 5 that generates both heat and electricity, and a hot water storage unit U1 having a hot water storage tank 2 that stores hot water. Although a specific configuration will be described later, FIG. 1 shows a hot water storage unit U1 having a hot water storage tank 2 and the like, a combined heat and power supply facility U2 having a combined thermoelectric device 5 and the like, a bath facility U3 having a bathtub 20 and the like, and heat consumption. A heat consuming equipment U4 having a terminal 28 and the like, a hot water supply equipment U5 having a hot water tap 25, a control unit C for controlling the operation of the cogeneration system, and receiving an operation control information input from an operator, An operation input unit 32 that transmits operation control information is described. The operation input unit 32 is also provided with a display unit 33 that displays various types of information handled by the cogeneration system.

The hot water storage unit U1 is responsible for heat recovery, storage, and supply while using hot water stored in the hot water storage tank 2 as a heat storage medium.
Heat recovery by the hot water storage unit U1 is performed with the combined heat and power supply equipment U2. Specifically, the hot water storage unit U1 of the cogeneration system connects the water supply source 30 and the hot water storage tank 2, the water supply path 1 through which the hot water supplied from the water supply source 30 flows, and the outlet 10 of the hot water storage tank 2. And a waste heat recovery passage 3 through which hot water extracted from the water flows back to the return port 11 of the hot water storage tank 2 again. The water supply channel 1 is connected to the bottom of the hot water storage tank 2. In the middle of the exhaust heat recovery path 3, a heat recovery unit 34 is provided for recovering the heat discharged from the heat and power supply device 5 by hot water flowing through the exhaust heat recovery path 3. Thus, the heat recovery unit 34 has relatively high-temperature heat generated by operating the combined heat and power supply device 5 and relatively low-temperature heat (hot water) flowing through the exhaust heat recovery path 3. Supplied. And when both perform heat exchange in the heat recovery unit 34, the combined heat and power supply device 5 is cooled, and the hot water flowing through the heat recovery unit 34 is heated.

  A water supply path 1 is connected to the hot water storage tank 2, and hot water stored in the hot water storage tank 2 is supplied from the water supply source 30 via the water supply path 1. The water supply source 30 is, for example, water supply equipment (such as a water supply pipe network or a water storage tank). A water supply opening / closing valve 6 and a water supply flow rate sensor 7 are provided in the middle of the water supply path 1. The water supply flow rate sensor 7 can measure the flow rate of water flowing from the water supply source 30 into the hot water storage tank 2. During the operation of the cogeneration system, the water supply opening / closing valve 6 is in an open state, and the water supply pressure from the water supply source 30 is applied to the hot water in the hot water storage tank 2. As a result, for example, when a hot-water tap 25 described later is opened, the hot-water tap 25 is discharged from the hot-water tap 25 and water is automatically supplied to the hot water storage tank 2 from the water supply channel 1.

  A drainage channel 8 is connected to the hot water storage tank 2, and hot water stored in the hot water storage tank 2 can be discharged to the drainage destination 31 through the drainage channel 8. The drainage destination 31 is, for example, a sewage facility (a sewer piping network). A drainage on-off valve 9 is provided in the middle of the drainage channel 8. During the operation of the cogeneration system, the drainage on-off valve 9 is closed, and when the hot water stored in the hot water storage tank 2 is discharged, the drainage on-off valve 9 is operated to open.

  In addition, the cogeneration system of this embodiment flows into the heat recovery unit 34 between the outlet 10 of the hot water storage tank 2 and the heat recovery unit 34 in the middle of the exhaust heat recovery path 3 provided in the hot water storage unit U1. When the temperature of the hot water to be performed is equal to or higher than a predetermined upper limit hot water temperature, a heat radiation promoting means 37 that operates to promote heat radiation from the hot water flowing through the exhaust heat recovery path 3 is provided. This heat radiation promotion means 37 can be realized by using, for example, a heat radiation fan 37a that can apply air (outside air) to the surface of the piping that constitutes the exhaust heat recovery path 3. The temperature of the hot water flowing into the heat recovery unit 34 is detected by the temperature sensor 36, and the detection result is transmitted to the control unit C. When the heat radiating fan 37a starts to operate in response to a command from the control unit C, outside air hits the surface of the pipe constituting the exhaust heat recovery path 3, and as a result, the inside of the pipe constituting the exhaust heat recovery path 3 Heat dissipation from hot water flowing through is promoted. On the other hand, since the air is not applied to the surface of the pipe constituting the exhaust heat recovery path 3 while the operation of the heat dissipation fan 37a is stopped, the heat dissipation from the hot water is not promoted. Furthermore, a radiating fin or the like for increasing the surface area may be provided on the surface of the pipe constituting the exhaust heat recovery path 3. And you may comprise so that the wind from the thermal radiation fan 37a may contact | win the thermal radiation fin.

  The combined heat and power facility U2 includes a combined heat and power supply device 5 and a heat recovery unit 34 (heat exchange unit) for recovering exhaust heat from the combined heat and power supply facility U2 into hot water flowing through an exhaust heat recovery path 3 described later. Have Moreover, the electric power generated by the combined heat and power supply device 5 can be supplied to a power load device (not shown). The combined heat and power supply device 5 may have any configuration as long as it can generate heat and electricity together. For example, a device that includes a fuel cell or an engine and a generator driven by the engine and uses exhaust heat of the engine and generated power of the generator can be used as the combined heat and power supply device 5.

  As described above, the heat recovery unit 34 to which the exhaust heat from the combined heat and power supply device 5 is supplied and the hot water storage tank 2 are connected using the exhaust heat recovery path 3 through which hot water circulates. That is, the hot water is configured to circulate between the heat recovery unit 34 and the hot water storage tank 2 through the exhaust heat recovery path 3. While operating the combined heat and power supply device 5, the control unit C operates the exhaust heat recovery circulation pump 4 provided in the middle of the exhaust heat recovery path 3, and hot water between the heat recovery unit 34 and the hot water storage tank 2. Circulate. Thus, the hot water flowing through the exhaust heat recovery path 3 has a role of cooling the combined heat and power supply device 5 and a role of recovering the exhaust heat from the combined heat and power supply device 5. The outlet 10 of the hot water storage tank 2 is provided on the bottom side, and the return port 11 of the hot water storage tank 2 is provided on the top side. Further, a water supply path 1 is connected to the bottom side of the hot water storage tank 2. With such an arrangement, relatively low temperature hot water is stored in the lower part of the hot water storage tank 2, and relatively hot water is stored in the upper part of the hot water storage tank 2. That is, hot water is stored in the hot water storage tank 2 in a form in which temperature stratification is formed.

  The hot water stored in the hot water storage tank 2 can be taken out from the hot water outlet 12 connected to the upper part of the hot water storage tank 2. An upstream side three-way valve 15, an auxiliary heater 16, a branch part 13, and a downstream side three-way valve 24 are provided in the middle of the hot water outlet 12.

  The auxiliary heater 16 of the present embodiment is a device that can heat hot water by consuming fuel and generating heat. The auxiliary heater 16 can be operated in a heating operation state where the supplied gas is combusted and the hot water is heated using the combustion heat. The auxiliary heater 16 includes an auxiliary heating heat exchanger 16h provided in a shared part of the hot water circulation path 22 and the bath circulation path 17 in the outlet water passage 12, an auxiliary burner 16b for heating the auxiliary heating heat exchanger 16h, The auxiliary burner 16b is provided with an auxiliary burner blower 16f for supplying combustion air to the auxiliary burner 16b. Gas water supplied through the auxiliary burner 16b fuel supply passage is combusted in the auxiliary burner 16b to heat the auxiliary heating heat exchanger 16h, thereby heating hot water flowing through the auxiliary heating heat exchanger 16h. Can do. The operation of the auxiliary heater 16 is controlled by the control unit C.

  The hot water supply path 12 branches the hot water supply path 14 at the branch section 13 downstream of the auxiliary heater 16, and the hot water circulation path 22 and the bath circulation path 17 are connected by the downstream three-way valve 24 downstream of the branch section 13. Can be divided.

  Connected to the hot water supply passage 14 is a hot water supply facility U5 having a hot water tap 25 provided in a bathroom or kitchen.

  The hot water circulation path 22 returns to the downstream three-way valve 24 via the downstream three-way valve 24, the heating heat exchanger 26, the junction 23, the circulation pump 35, the upstream three-way valve 15, and the auxiliary heater 16. Follow the path.

  The heat consuming equipment U4 includes a heating heat exchanger 26, a heating circulation path 27, a heat consuming terminal 28, and a heating pump 29. The heating circulation path 27 is a path through which the heating heat medium circulates in sequence through the heating pump 29, the heating heat exchanger 26, and the heat consuming terminal 28. The heat consumption terminal 28 is a heating device such as a floor heating device. When hot water is circulating in the hot water circulation path 22 and the auxiliary heater 16 is in a heating operation state, the hot water heated by the auxiliary heater 16 is supplied to the heating heat exchanger 26. . In the heating heat exchanger 26, heat exchange between hot water flowing through the hot water circulation path 22 and a heating heat medium flowing through the heating circulation path 27 is performed. When the auxiliary heater 16 is in the heating operation state, the hot water flowing through the hot water circulation path 22 is heated by the auxiliary heater 16 and then flows into the heating heat exchanger 26. Then, in the heating heat exchanger 26, the heat held by the hot water heated by the auxiliary heater 16 is transmitted to the heating heat medium flowing through the heating circulation path 27. The heating medium after being heated in the heating heat exchanger 26 is supplied to the heat consuming terminal 28 through the heating circulation path 27. The heating medium after heat consumption at the heat consuming terminal 28 flows into the heating heat exchanger 26 through the heating circulation path 27 and is heated again.

  The bath circulation path 17 returns to the downstream three-way valve 24 via the downstream three-way valve 24, the bath heat exchanger 18, the junction 23, the circulation pump 35, the upstream three-way valve 15, and the auxiliary heater 16. Follow the path. When hot water is circulating in the bath circulation path 17 and the auxiliary heater 16 is in the heating operation state, the hot water after being heated by the auxiliary heater 16 is supplied to the bath heat exchanger 18. .

  The bath facility U3 includes a bath heat exchanger 18, a bathtub water circulation path 19, a bath pump 21, and a bathtub 20. The bathtub water circulation path 19 is a path through which hot water circulates in sequence through the bath pump 21, the bathtub 20, and the bath heat exchanger 18. In the bath heat exchanger 18, heat exchange is performed between hot water flowing through the bath circulation path 17 and hot water flowing through the bathtub water circulation path 19. When the auxiliary heater 16 is in a heating operation state, hot water flowing through the bath circulation path 17 is heated by the auxiliary heater 16 and then flows into the bath heat exchanger 18. In the bath heat exchanger 18, the heat held by the hot water after being heated by the auxiliary heater 16 is transmitted to the hot water flowing through the bathtub water circulation path 19. Then, the hot water heated in the bath heat exchanger 18 is supplied to the bathtub 20 through the bathtub water circulation path 19.

  Next, a test operation method of the cogeneration system will be described. In the trial operation method of the cogeneration system according to the present invention, at least one of the water supply source 30 for supplying hot water to the cogeneration system and the drainage destination 31 from which the hot water is discharged from the cogeneration system is in the state before the installation. When in the temporary state, the first trial operation step of performing the test operation of the combined heat and power supply device 5 and recovering the heat discharged from the combined heat and power supply device 5 using the hot water supplied from the supply water source 30; A second test operation step of performing a test operation of the hot water storage unit U1 after both of the drainage destinations 31 are in the main installation state. Furthermore, in this embodiment, after the trial operation of the combined heat and power supply device 5 is completed in the first trial operation step, the hot water used for recovering the heat discharged from the combined heat and power supply device 5 is discharged to the drainage destination 31. In the present application, the “temporary state” is a state in which a temporary water supply source (water supply facility) 30 or a drainage destination (sewage facility) 31 is used. Therefore, the total amount of hot water that can be supplied is less than that in the case of the main installation, or the amount of hot water that can be supplied per unit time is less than in the case of the main installation. The total amount of hot water that can be drained without overflowing water is less than when it is in the installed state, and the amount of hot water that can be drained per unit time without overflowing is less than when it is in the installed state. Can occur.

  FIG. 2 is a flowchart for explaining a test operation method of the cogeneration system. For example, when the cogeneration system as shown in FIG. 1 is installed in a dwelling unit or facility, this flowchart is performed so that an operator can check whether the combined heat and power supply device 5 and the hot water storage unit U1 operate normally. This is the procedure for trial operation. Note that the hot water storage tank 2 is in an empty state before the flowchart shown in FIG. 2 is executed.

As shown in FIG. 2, in step # 10, the worker sets up at least one of a water supply source 30 for supplying hot water to the cogeneration system and a drainage destination 31 from which the hot water is discharged from the cogeneration system. When it is the temporary state before the state, the first trial operation step for performing the trial operation of the combined heat and power supply device 5 is performed. And after this 1st trial run process is complete | finished, an operator determines whether both the water supply source 30 and the drainage destination 31 were in the permanent installation state in process # 20. When both the water supply source 30 and the drainage destination 31 are in the main installation state, the worker performs a second trial operation step for performing a trial operation of the hot water storage unit U1 in step # 30.
Hereinafter, the first trial operation step and the second trial operation step will be described with specific examples.

  FIG. 3 is a flowchart for explaining the first trial operation step. As will be described in detail below, in the first trial operation process, the hot water tank 2 is not filled with hot water, the trial operation of the combined heat and power supply device 5 is performed, and hot water is passed through the heat recovery section 34 of the exhaust heat recovery path 3. By collecting the heat, the heat discharged from the combined heat and power supply device 5 is recovered.

  In step # 11, the worker performs a water supply start step for starting the supply of hot water from the water supply source 30 to the hot water storage tank 2 prior to starting the trial operation of the combined heat and power supply device 5. Specifically, the operator uses the operation input unit 32 to instruct the control unit C to start supplying hot water to the hot water storage tank 2. The control part C will open the water supply on-off valve 6 provided in the middle of the water supply path 1, if the water supply start instruction | command from an operator is received. As a result, water supply from the water supply source 30 to the hot water storage tank 2 is started. Moreover, the control part C can acquire the detection information of the feed water flow sensor 7, and the amount (total amount) of hot water supplied to the hot water storage tank 2 by performing this water supply start process based on the detection information. Is calculated.

  Next, in step # 12, the control unit C performs the water supply start step (step # 11) so that the amount of hot water supplied to the hot water storage tank 2 is determined by the outlet 10 and the heat recovery unit 34 of the hot water storage tank 2. A first determination step is performed to determine whether or not a first reference amount of hot water that can create a state where hot water is filled in the exhaust heat recovery path 3 is reached. If the exhaust heat recovery path 3 between the outlet 10 of the hot water storage tank 2 and the heat recovery unit 34 is filled with hot water, the heat recovery unit 34 can cool the combined heat and power supply device 5. That is, it can be said that the first determination step is a step of determining whether or not the combined heat and power supply device 5 may be started (whether or not the combined heat and power supply device 5 can be cooled).

  For example, the water level inside the hot water storage tank 2 rises with the start of water supply from the water supply channel 1 and then reaches the outlet 10 of the hot water storage tank 2. When the water level in the hot water storage tank 2 reaches the outlet 10, hot water flows out from the outlet 10 to the exhaust heat recovery path 3, and between the outlet 10 of the hot water tank 2 and the heat recovery section 34. The exhaust heat recovery path 3 is filled with hot water. In addition, although not utilized for the heat recovery in the heat recovery unit 34, hot water for filling the piping in the cogeneration system is also required. For example, hot water that fills the water supply path 1 between the feed water flow sensor 7 and the hot water storage tank 2, hot water that satisfies the water level at the bottom of the hot water storage tank 2 and the water level of the outlet 10, Although it is not used for heat recovery in the heat recovery section 34, it is necessary to satisfy the piping in the cogeneration system. In the present embodiment, the control unit C includes a storage unit such as an internal memory in the middle of the water supply path 1 between a part where the water supply flow rate sensor 7 is provided and the hot water storage tank 2, and a hot water storage tank. 2, the volume of the hot water storage tank 2 from the water level at the bottom of the interior to the water level of the outlet 10, and the exhaust heat recovery path 3 between the outlet 10 of the hot water tank 2 and the heat recovery part 34. The total volume with the volume is stored. And the control part C will perform this water supply start process (process # 11), if the quantity of the hot water supplied to the hot water storage tank 2 reaches the said total volume by performing this water supply start process (process # 11). Thus, it is determined that the amount of hot water supplied to the hot water storage tank 2 has reached the first reference hot water amount, and the process proceeds to the next step # 13.

  In contrast, while the control unit C determines that the amount of hot water supplied to the hot water storage tank 2 has not reached the first reference hot water amount by performing this water supply start step (step # 11). Repeats step # 12.

  In step # 13, the controller C performs the water supply start step (step # 11) in the first determination step (step # 12) so that the amount of hot water supplied to the hot water storage tank 2 becomes the first reference hot water amount. If it determines with having reached, the 1st trial operation start process which starts the flow of the hot water in the waste heat recovery path 3 and the trial operation of the combined heat and power supply device 5 is performed. This step corresponds to the start of the first trial operation step (step # 10 in FIG. 2) as a whole. That is, prior to the start of the first trial operation start step (step # 13), it is necessary to establish a state in which the heat and power supply device 5 can be cooled in the heat recovery unit 34.

  Thereafter, in step # 14, the control unit C uses the hot water flowing through the exhaust heat recovery path 3 so that the amount of hot water supplied to the hot water storage tank 2 by performing the water supply start step (step # 11). A second determination step of determining whether or not the second reference amount of hot water equal to or greater than the first reference amount of hot water, which can continuously recover the heat discharged from the cogeneration apparatus 5, is performed. When the controller C determines that the amount of hot water supplied to the hot water storage tank 2 has reached the second reference hot water amount by performing the water supply start step (step # 11), the process proceeds to step # 15. To do.

  In the present embodiment, the second reference amount of hot water is used for the hot water storage tank 2 while continuously recovering the heat discharged from the combined heat and power supply device 5 using the hot water flowing through the exhaust heat recovery path 3. This is the amount of hot water that can create a state in which the exhaust heat recovery path 3 between the outlet 10 and the return port 11 is filled with hot water. In the present embodiment, since the heat dissipation promotion means 37 described above is provided between the outlet 10 of the hot water storage tank 2 and the heat recovery part 34 in the middle of the exhaust heat recovery path 3, the exhaust heat recovery path 3 is While continuously recovering the heat discharged from the combined heat and power supply device 5 using the flowing hot water, hot water is added to the exhaust heat recovery path 3 between the outlet 10 and the return port 11 of the hot water storage tank 2. If it is the state which satisfy | filled, the cogeneration apparatus 5 can always be cooled. That is, in this embodiment, it is sufficient that air does not enter the exhaust heat recovery path 3. For example, as in the case of the first reference amount of hot water, the control unit C reaches the hot water storage tank 2 from a portion where the water supply flow rate sensor 7 is provided in the middle of the water supply path 1 in storage means such as an internal memory. , The volume of the hot water tank 2 from the water level at the bottom of the hot water tank 2 to the water level of the outlet 10, and the return of the hot water tank 2 and the hot water tank 2 The total volume with the volume of the exhaust heat recovery path 3 between the mouth 11 is stored. And the control part C will perform this water supply start process (process # 11), if the quantity of the hot water supplied to the hot water storage tank 2 reaches the said total volume by performing this water supply start process (process # 11). Thus, it is determined that the amount of hot water supplied to the hot water storage tank 2 has reached the second reference hot water amount.

  In step # 15, the controller C performs the water supply start step (step # 11) in the second determination step (step # 14) so that the amount of hot water supplied to the hot water storage tank 2 becomes the second reference hot water amount. If it determines with having reached, the water supply stop process which stops the water supply from the water supply source 30 to the hot water storage tank 2 will be performed, continuing the flow of the hot water in the exhaust heat recovery path 3 and the trial operation of the combined heat and power supply device 5. Specifically, the control unit C closes the water supply opening / closing valve 6 provided in the middle of the water supply channel 1. As a result, water supply from the water supply source 30 to the hot water storage tank 2 is stopped.

  By performing each process as described above, the operator can continuously cool the cogeneration device 5 while the operator is performing a trial operation of the cogeneration device 5.

  Thereafter, in step # 16, the control unit C determines whether or not a trial run stop command has been received from the operator. When the operator uses the operation input unit 32 to command the trial operation stop of the cogeneration apparatus 5, the control unit C determines that the trial operation stop command has been received from the operator, and proceeds to step # 17.

In step # 17, the control unit C performs a first trial operation stop step of the combined heat and power supply device 5. The first trial operation stop step (step # 17) includes a first stop step for stopping the operation of the combined heat and power supply device 5 and a second stop step for stopping the flow of hot water to the exhaust heat recovery path 3. Specifically, the control part C performs the operation stop process (1st stop process) which stops the driving | operation of cogeneration apparatus 5 itself as a 1st stop process. Note that when the combined heat and power supply device 5 is stopped, the combined heat and power supply device 5 still retains heat, and therefore it is necessary to perform cooling for the purpose of removing the heat. Therefore, the control part C continues the hot water flow in the exhaust heat recovery path 3 even after performing the first stop step. And the control part C will detect the temperature of the hot water which flows out from the heat recovery part 34 detected by the temperature sensor 38 below a predetermined temperature, or the temperature of a predetermined part inside the cogeneration apparatus 5 is below a predetermined set temperature. Then, it is determined that the cooling of the combined heat and power supply device 5 in the heat recovery unit 34 is sufficient, and the flow of hot water in the exhaust heat recovery path 3 is stopped (second stop step). Specifically, the control unit C stops the operation of the exhaust heat recovery circulation pump 4 and completes the second stop process using the display unit 33 (the cooling of the combined heat and power supply device 5 is completed). To the operator.
After the above steps are completed, the worker who has received the notification as described above instructs the control unit C to drain. And the control part C operates the drainage on-off valve 9 provided in the middle of the drainage channel 8 to the valve open state, and discharges the hot water stored in the hot water storage tank 2 or the like to the outside of the system (first). 3 stop process).

  As described above, in this embodiment, when at least one of the water supply source 30 and the drainage destination 31 is in the temporary state, that is, before both the water supply source 30 and the drainage destination 31 are in the permanent installation state, Trial operation of the co-feed device 5 is performed (first trial operation step). That is, since the trial operation of the combined heat and power supply device 5 can be performed with a relatively small amount of hot water, even if the water supply source 30 is in a temporary state (that is, a large amount of hot water can be supplied from the water supply source 30). Even if it is not possible, there is no problem in the trial operation of the combined heat and power supply device 5, and even if the drainage destination 31 is in a temporary state (that is, a large amount of hot water cannot be discharged to the drainage destination 31). There is no problem in the trial operation of the combined heat and power supply device 5. In addition, in the first trial operation process, the hot water is frozen until the second trial operation process is started by discharging the hot water to the drainage destination 31 after the trial operation of the combined heat and power supply device 5 is completed. And problems such as bacteria breeding can be prevented.

  FIG. 4 is a flowchart for explaining the second trial operation step. As will be described in detail below, in the second test operation step, the hot water storage tank 2 is filled with hot water and the hot water storage unit U1 is tested.

  In step # 31, the operator performs a water supply start step (step # 11) for starting the supply of hot water from the water supply source 30 to the hot water storage tank 2 before starting the trial operation of the hot water storage unit U1. Specifically, the operator uses the operation input unit 32 to instruct the control unit C to start supplying hot water to the hot water storage tank 2. The control part C will open the water supply on-off valve 6 provided in the middle of the water supply path 1, if the water supply start instruction | command from an operator is received. As a result, water supply from the water supply source 30 to the hot water storage tank 2 is started. In addition, water supply to the hot water storage tank 2 proceeds and to the hot water flow path (exhaust heat recovery path 3, drainage path 8, hot water path 12, bath circulation path 17, hot water circulation path 22) connected to the hot water storage tank 2. Also hot water flows in. In the state where the hot water storage tank 2 and these hot water flow paths are not filled with hot water, water supply continues from the water supply path 1, and hot water is flowing through the water supply flow rate sensor 7 provided in the middle of the water supply path 1. It is detected that there is. On the other hand, when the hot water storage tank 2 and the hot water flow path become full, hot water does not flow in the water supply path 1, and the water supply flow rate sensor 7 detects that the instantaneous flow rate of hot water is zero.

  In step # 32, the control unit C determines whether or not the hot water storage tank 2 and the hot water channel are full. Specifically, based on the detection result of the water supply flow rate sensor 7, the control unit C determines that the water supply channel 1 is not full when hot water is flowing through the water supply channel 1. When the instantaneous flow rate of hot water is zero, it is determined that the state is “full”. When the control unit C determines that the state is “full state”, the control unit C displays a message to that effect on the display unit 33 to notify the operator that the state is full.

  Next, in step # 33, the operator performs a second trial operation start step for starting a trial operation of the hot water storage unit U1. This second trial operation start step (step # 33) corresponds to the start of the second trial operation step (step # 30 in FIG. 2). For example, various pumps are operated using the operation input unit 32 or the auxiliary heater 16 is operated. Further, the worker may visually confirm the presence or absence of water leakage from the piping or the like. Then, when the series of trial runs is completed, the worker instructs the stop of the trial run of the hot water storage unit U1 using the operation input unit 32.

  Thereafter, in step # 34, the control unit C determines whether or not a test run stop command has been received from the operator. When receiving a trial run stop command from the operator, the control unit C proceeds to step # 35.

  In step # 35, the control unit C performs the second trial operation stopping step of the hot water storage unit U1. In this second trial stop process (process # 35), the drainage on-off valve 9 provided in the middle of the drainage channel 8 is operated to open the hot water stored in the hot water storage tank 2 and the like outside the system. To be discharged.

  As described above, in the present embodiment, the trial operation of the hot water storage unit U1 is performed after both the water supply source 30 and the drainage destination 31 are in the permanent installation state (second trial operation step). That is, if the water supply source 30 is in the permanent state, there is no shortage of hot water to fill the hot water storage tank 2, and if the drainage destination 31 is in the permanent state, the hot water discharged from the hot water storage tank 2 will not overflow. .

  Thus, in this embodiment, the timing (relatively at least one of the water supply source 30 and the drainage destination 31) with a relatively large time margin until a resident enters the dwelling unit or facility where the cogeneration system is installed. Since the cogeneration system 5 is being trial run in the timing when one side is in a temporary state), the time margin until the resident enters the dwelling unit or facility where the cogeneration system is installed is relatively small At the timing when both the water supply source 30 and the drainage destination 31 are in the main installation state, only the trial operation of the hot water storage unit U1 may be performed. Therefore, compared with the case where both the trial operation of the combined heat and power supply device 5 and the trial operation of the hot water storage unit U1 must be performed after both the water supply source 30 and the drainage destination 31 are in the main installation state, the time margin for the trial operation is obtained. There is an advantage that a large amount can be secured and man-hours can be reduced.

Second Embodiment
The second embodiment is different from the cogeneration system of the first embodiment in that the cogeneration system in which the test operation method according to the present invention is performed does not include the heat dissipation promotion means 37. The second embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

  FIG. 5 is a diagram illustrating a configuration of a cogeneration system in which the test operation method of the second embodiment is performed. As shown in the figure, in the present embodiment, the heat radiation promoting means 37 as described in the first embodiment is provided between the outlet 10 of the hot water storage tank 2 and the heat recovery section 34 in the middle of the exhaust heat recovery path 3. I do not have. In other words, in the heat recovery unit 34, concrete for promoting the release of heat from the hot water after being used for heat recovery from the cogeneration device 5, that is, hot water whose temperature has increased due to the heat recovery from the cogeneration device 5. There is no specific means in the system. Therefore, the hot water stored in the hot water storage tank 2 and the exhaust heat recovery path 3 become longer as the operation duration of the combined heat and power supply device 5 after the start of the first trial operation start process (process # 13 in FIG. 3) starts. The period of heat recovery by hot water flowing through becomes longer. And even if the amount of heat held by the hot water circulating through the hot water storage tank 2 and the exhaust heat recovery path 3 increases, and finally the temperature of the hot water flowing into the heat recovery unit 34 becomes equal to or higher than the predetermined upper limit hot water temperature, The temperature cannot be forcibly lowered. That is, during the operation continuation period of the combined heat and power supply device 5 after the start of the first trial operation start process (process # 13), the temperature of the hot water flowing into the heat recovery unit 34 reaches a predetermined upper limit hot water temperature. Limited to the period.

  In view of such a problem, in the present embodiment, the second reference amount of hot water described above is used after the hot water flow in the heat recovery unit 34 becomes necessary with the start of the trial operation of the combined heat and power supply device 5. Hot water having a temperature lower than a predetermined upper-limit hot water temperature is continuously passed through the heat recovery unit 34 during a heat recovery period until the hot water flow through the heat recovery unit 34 becomes unnecessary with the completion of the trial operation of the co-feeder 5. Set to the amount of hot and cold water that can be allowed. Simply, in order to delay the rise in the temperature of the hot water circulating through the hot water storage tank 2 and the exhaust heat recovery passage 3 in terms of time, the second reference hot water amount may be increased.

Hereinafter, the second reference amount of hot water will be described with reference to FIG.
FIG. 6 is a diagram illustrating a method for deriving the second reference amount of hot water in the test operation method of the second embodiment. As shown in the figure, hot water in the heat recovery unit 34 is completed along with the completion of the trial operation of the combined heat and power supply 5 after the hot water flow in the heat recovery unit 34 becomes necessary with the start of the trial operation of the combined heat and power supply device 5. The heat recovery period until no flow is required corresponds to the period from time t0 to time t4.

Specifically, time t0 is a timing at which the cogeneration apparatus 5 is started. Therefore, in the combined heat and power supply device 5, the heat output gradually increases from time t0, and heat recovery by the heat recovery unit 34 is required.
The time t1 is a timing for starting the power generation of the cogeneration device 5, that is, a timing for starting to supply the electric power generated by the cogeneration device 5 to the power load device (not shown). The illustrated power of 250 W is an example of the minimum generated power of the combined heat and power supply device 5.
Time t2 is timing when the power generation output of the combined heat and power supply device 5 reaches the rated value (700 W).
Time t3 is a timing at which the operation of the combined heat and power supply device 5 is stopped and a timing at which the cooling of the combined heat and power supply device 5 is started. That is, when the operation of the combined heat and power supply device 5 is stopped, the combined heat and power supply device 5 still retains (discharges) heat, and thus it is necessary to continue heat recovery (cooling).
Time t4 is timing when heat recovery (cooling) from the combined heat and power supply device 5 is completed.

[Amount of heat A]
The period from the time t0 to the time t1 (starting start to power generation start) corresponds to the step of starting the cogeneration device 5, and during this time, the amount of heat A recovered from the cogeneration device 5 is, for example, 100 Wh by performing an experiment. Can be estimated.
Amount of heat A = 100Wh

[Amount of heat B]
The period from the time t1 to the time t2 (starting power generation to rating) corresponds to the step of increasing the output from the minimum output to the rated output after starting the combined heat and power supply device 5, and during this time the amount of heat B recovered from the combined heat and power supply device 5 Can be derived as follows.
Q1 = 250W ÷ power generation efficiency × exhaust heat efficiency = 250W ÷ 0.3 × 0.4
= 333W
Q2 = 700W ÷ power generation efficiency × exhaust heat efficiency = 700W ÷ 0.4 × 0.5
= 875W
Amount of heat B = integration from time t1 to time t2 = (Q1 + Q2) × 0.5 hours / 2
= 302Wh

[Amount of heat C]
The period from the time t2 to the time t3 (rated to start cooling) corresponds to a process in which the combined heat and power supply device 5 is tested in the rated state and the state is confirmed, and the amount of heat C generated and recovered during this period is It can be derived as follows.
Amount of heat C = Q2 × 0.15 hours = 131 Wh

[Amount of heat D]
During the period from time t3 to time t4 (cooling start to cooling end), the combined heat and power supply device 5 is stopped, and thereafter, the combined heat and power supply device 5 is cooled, that is, with the completion of the trial operation of the combined heat and power supply device 5. Therefore, the amount of heat D recovered during this period until the hot water flow in the heat recovery unit 34 becomes unnecessary can be estimated to be 350 Wh, for example, by performing an experiment.
Amount of heat D = 350Wh

  Therefore, the amount of heat recovered during the heat recovery period (period from time t0 to time t4) is 883 Wh, which is the sum of the heat amounts A to D. And if this amount of heat is recovered by the hot water supplied from the water supply channel 1, it is derived that 883Wh × 0.86 ÷ (60 ° C-30 ° C) +5 liters (power generation unit holding water amount) = 25 liters + 5 liters = 30 liters it can. Here, the temperature of the hot water supplied from the water supply channel 1 is 30 ° C., and the temperature of the hot water after heat recovery flowing out from the heat recovery unit 34 is 60 ° C. The amount of hot water “30 liters” derived in this way is the amount of hot water used for heat recovery in the heat recovery unit 34. The “power generation unit retained water amount” described above is the amount of water necessary for the power generation unit including the combined heat and power supply device 5 to perform the power generation operation. For example, when the combined heat and power supply 5 is a fuel cell, the power generation unit retained water amount includes water amounts such as reforming water, battery cooling water, and water for humidifying the cell stack.

As described in the above embodiment, hot water for filling the piping in the cogeneration system is also required, although it is not used for heat recovery in the heat recovery unit 34. For example, hot water that fills the water supply path 1 between the feed water flow sensor 7 and the hot water storage tank 2, hot water that satisfies the water level at the bottom of the hot water storage tank 2 and the water level of the outlet 10, Although it is not used for heat recovery in the heat recovery section 34, it is necessary to satisfy the piping in the cogeneration system.
Therefore, the controller C is not used for the amount of hot water (30 liters) derived as described above (the amount of hot water used for heat recovery in the heat recovery unit 34) and for heat recovery in the heat recovery unit 34. Determines the sum of the amount of hot water for filling the piping in the cogeneration system and the like as the second reference amount of hot water.

  As described above, even if the amount of heat held by the hot water circulating through the hot water storage tank 2 and the exhaust heat recovery path 3 is increased by starting execution of the first trial operation start step (step # 13), the first trial operation stop step ( Until the cooling of the combined heat and power supply device 5 is completed in step # 17), hot water having a temperature lower than a predetermined upper limit hot water temperature can be continuously supplied from the hot water storage tank 2 to the heat recovery unit 34.

<Third Embodiment>
The third embodiment is different from the above embodiment in the procedure of the first test operation step in the test operation method according to the present invention. The third embodiment will be described below, but the description of the same configuration as the above embodiment will be omitted.

FIG. 7 is a diagram illustrating a configuration of a cogeneration system in which the test operation method of the third embodiment is performed.
As shown in FIG. 7, the worker attaches the temporary water supply path 39 and the temporary drainage path 40 to the exhaust heat recovery path 3 before starting the trial operation of the combined heat and power supply device 5. Specifically, the temporary water supply path 39 is attached to the middle of the exhaust heat recovery path 3 while going from the outlet 10 of the hot water storage tank 2 to the heat recovery section 34, and the temporary drainage path 40 is connected from the heat recovery section 34 to the hot water storage. Attached in the middle of the exhaust heat recovery path 3 while heading toward the return port 11 of the tank 2. And even if water is supplied to the temporary water supply channel 39, water does not flow into the hot water storage tank 2 through the outlet 10 and the return port 11 (that is, the total amount of water supplied from the temporary water supply channel 39 is recovered by heat. Treatment so that it flows into the section 34 and is discharged from the temporary drainage channel 40). Then, the cooling water is supplied to the temporary water supply channel 39 and the heat recovery in the heat recovery unit 34 is started. The cooling water after heat recovery at the heat recovery unit 34 is discharged from the temporary drainage channel 40. By adopting such a configuration, it becomes possible to continuously cool the cogeneration device 5 while the operator is performing a trial operation of the cogeneration device 5. Thereafter, the worker starts a trial operation of the combined heat and power supply device 5. Thus, in the present embodiment, in the first trial operation step, the trial operation of the combined heat and power supply device 5 is performed, and hot water supplied from the water supply source 30 without passing through the hot water storage tank 2 to the heat recovery unit 34 is passed. By collecting the heat, the heat discharged from the combined heat and power supply device 5 is recovered.

When the operator stops the trial operation of the combined heat and power supply device 5, first, the operator performs an operation stop process for stopping the operation of the combined heat and power supply device 5 itself. Note that when the combined heat and power supply device 5 is stopped, the combined heat and power supply device 5 still retains heat, and therefore it is necessary to perform cooling for the purpose of removing the heat. Therefore, the worker continues to flow hot water using the temporary water supply channel 39 and the temporary drainage channel 40 even after performing the operation stop processing. When the temperature of the hot water flowing out from the heat recovery unit 34 detected by the temperature sensor 38 becomes lower than a predetermined temperature, or the temperature of a predetermined portion inside the combined heat and power supply device 5 is lower than a predetermined set temperature. If it becomes, it will determine with cooling of the combined heat and power supply apparatus 5 in the heat recovery part 34, and the flow of the hot water using the temporary water supply path 39 and the temporary drainage path 40 will be stopped.
And after the above process is complete | finished, an operator removes the temporary water supply channel 39 and the temporary drainage channel 40. FIG.

<Another embodiment>
<1>
In the said embodiment, although the specific structure of the cogeneration system was illustrated, the structure can be changed suitably. For example, the configuration of a piping network through which hot water flows, the configuration of equipment (for example, the configuration of the auxiliary heater 16), and the like can be changed as appropriate.
Moreover, the derivation example of the 2nd reference | standard hot water amount mentioned above was described for the purpose of illustration, and this invention is not limited to the derivation example. If the configuration of the pipe network through which hot water flows is different, the numerical value of the second reference hot water amount is naturally different, the numerical value is different if the heat output of the combined heat and power supply device 5 is different, or the numerical value is also different if the test operation period is different. Because it is different.

<2>
In the above-described embodiment, an example in which the control unit C automatically controls the operation of devices such as the water supply on / off valve 6 and the drainage on / off valve 9 at a predetermined control timing has been described. It may be operated manually. In this case, if the control unit C notifies the worker that the predetermined control timing has come, using the display unit 33 or a lamp (not shown), and prompts the worker to manually operate the device. Good. That is, each process of the trial operation method of the cogeneration system described above may be performed automatically under the control of the control unit C, or may be performed manually by an operator. For example, the control unit C automatically detects the start of power generation by the combined heat and power supply device 5 without receiving a trial operation stop command from the worker in step # 15 shown in FIG. And the process # 16 may be executed.

  INDUSTRIAL APPLICABILITY The present invention is used for a test operation method of a cogeneration system that can smoothly perform a test operation of a combined heat and power supply device and a hot water storage unit even if at least one of a water supply source and a drainage destination of the cogeneration system is in a temporary state. it can.

2 Hot-water storage tank 3 Waste heat recovery path 5 Combined heat and power supply apparatus 10 Drain outlet 11 Return port 30 Water supply source 31 Drain destination 34 Heat recovery section 37 Heat radiation promotion means U1 Hot water storage unit

Claims (4)

A cogeneration system trial operation method comprising a combined heat and power device that generates heat and electricity, and a hot water storage unit having a hot water storage tank for storing hot water,
When at least one of a water supply source for supplying hot water to the cogeneration system and a drainage destination from which the hot water is discharged from the cogeneration system is in a temporary state before the main installation state, the trial operation of the cogeneration device And a first trial operation step of recovering heat discharged from the combined heat and power supply device using hot water supplied from the water supply source,
A test operation method for a cogeneration system including a second test operation step of performing a test operation of the hot water storage unit after both the water supply source and the drainage destination are in a permanent installation state. The cogeneration system is a waste heat recovery path that is supplied to the hot water storage tank from the water supply source and flows while the hot water extracted from the hot water storage tank outlet returns to the return port of the hot water storage tank again. In the middle of the exhaust heat recovery path, the hot water flowing through the exhaust heat recovery path is provided with a heat recovery unit that recovers the heat discharged from the combined heat and power device,
In the first trial operation step, the hot water storage tank is not filled with hot water, a trial operation of the heat and power supply device is performed, and hot water is allowed to flow through the heat recovery section of the exhaust heat recovery path, thereby the heat and power supply device. Recovering the heat exhausted from
The test operation method for a cogeneration system according to claim 1, wherein in the second test operation step, the hot water storage unit is filled with hot water and the hot water storage unit is tested.   3. The cogeneration system according to claim 1, wherein in the first trial operation step, after the trial operation of the combined heat and power device is completed, hot water used for recovering heat discharged from the combined heat and power device is discharged to a drainage destination. Test run method. The cogeneration system is provided with a heat recovery unit that recovers heat discharged from the combined heat and power supply device using hot water flowing through the cogeneration system.
In the first test operation step, the combined heat and power supply device is tested and the hot water supplied from the water supply source without passing through the hot water storage tank is allowed to flow to the heat recovery unit from the combined heat and power supply device. The test operation method of the cogeneration system according to claim 1, wherein heat discharged is recovered.

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