JP5975271B2 - Hot water storage hot water supply system - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply system including a hot water storage tank for storing hot water heated using, for example, a heat pump.

  In this type of hot water storage type hot water supply system, for example, hot water heated using a heat pump is stored in a hot water storage tank, and when the hot water tap is opened, hot water in the hot water storage tank is supplied toward the hot water tap. It is comprised so that. In such a system, a case where the hot water in the hot water storage tank is lower than the target hot water supply temperature may occur. Therefore, conventionally, there is an auxiliary heat source device that is provided separately from the heat pump (main heat source device) so that hot water discharged from the hot water storage tank can be heated using the auxiliary heat source device and then supplied to the hot water supply destination. (For example, see Patent Documents 1 and 2).

When the installation work of the hot water storage type hot water supply system as described above is completed, it is necessary to perform water filling work on the hot water storage tank and the hot water flow path connected to the hot water storage tank as in the case of other hot water storage type hot water supply systems. On the other hand, after finishing the water filling operation, it is desired to confirm whether or not the water filling is properly performed. If the heat pump is driven afterwards without water filling properly, the hot water supply from the hot water storage tank side to the heat pump side is not made properly, and the heat pump condenser used for hot water heating (heat exchanger) May not be properly cooled, that is, the heat pump may be blown. In addition, when water filling is not appropriate, there is a possibility that hot water circulation failure due to air biting into the pump or acceleration of erosion / corrosion may occur.
On the other hand, in the prior art, no means has been provided that can easily and accurately determine whether or not the above-described water filling is properly performed. Therefore, there was room for improvement in this regard.

JP 2011-112320 A JP2012-93081A

  The present invention has been conceived under the circumstances as described above, and it is easy to determine whether or not this water filling is appropriate after performing the water filling work on the hot water storage tank and the hot water flow path connected thereto. An object of the present invention is to provide a hot water storage type hot water supply system capable of accurately and accurately judging.

  In order to solve the above problems, the present invention takes the following technical means.

The hot water storage hot water supply system provided by the present invention drives the circulation pump to supply hot water in the hot water storage tank from the lower part of the hot water storage tank to the heat exchanger of the main heat source machine, and then heats the hot water storage tank. A hot water heating circulation path capable of returning to the upper part of the inside, and an auxiliary heat source device capable of heating hot water flowing out from the upper part of the hot water storage tank and sent to a predetermined outlet or heat load in the middle And a hot water storage hot water supply system comprising an additional pump capable of flowing hot water heated by the auxiliary heat source device into the lower part of the hot water storage tank. are the, after water filling operations on the pipe section various parts connected to the hot water storage tank and the hot water storage tank, and sets the auxiliary flow path by the auxiliary heat source unit The hot water that has been heated to flow into the lower portion within the hot water storage tank by the driving of said additional pump, and by driving the circulation pump in a state of stopping the operation of the main heat source unit, the bottom of the hot water storage tank wherein feeding the heated hot water towards the main heat source unit through the hot water heating circulation path commissioning are possible, at the time of this trial, the main heat source unit during the period from the time of commissioning until predetermined time elapses in If the temperature on the outlet side of the heat exchanger rises, it is determined that water filling is performed normally, and if not, it is determined that water filling is not performed normally and notification to that effect is given. It is characterized by having means.

According to such a configuration, the following effects can be obtained.
That is, when the hot water heated by the auxiliary heat source device flows into the hot water storage tank and is appropriately sent from the hot water storage tank toward the heat exchanger of the main heat source device during the trial operation, Despite the machine being shut down, the outlet temperature of the heat exchanger rises. Therefore, when the outlet side temperature rises, it is determined that the hot water heating circulation path is properly filled and hot water is appropriately supplied from the hot water storage tank to the main heat source machine side. Can do. On the other hand, unlike the above, if the temperature at the outlet side of the heat exchanger of the main heat source machine does not rise, if there is no failure in the equipment such as the circulation pump as the cause, water filling is not performed properly. It can be considered as a major factor. For this reason, according to the present invention, it is possible to easily and accurately determine whether or not water filling is appropriate. As a result, it is preferable to prevent such a problem that the main heat source machine such as a heat pump is operated in an air-operated state without noticing the fact that the water filling is in an inappropriate state.

Further, according to the above-described configuration, whether or not the water filling is properly performed is determined by the determination unit, so that it is not necessary for the operator to make such a determination.

  In the present invention, preferably, the auxiliary heat source device and the circulation pump are provided with control means capable of driving control and setting operation control of the auxiliary flow path, and the control means is subjected to a predetermined switch operation. Thus, the test operation is started.

  According to such a configuration, a trial operation can be easily performed by performing a predetermined switch operation, which is more preferable for reducing the burden on the operator.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is explanatory drawing which shows an example of the hot water storage type hot-water supply system which concerns on this invention. It is explanatory drawing which shows the state in which trial operation is performed in the hot water storage type hot-water supply system shown in FIG. It is a flowchart which shows an example of the operation | movement procedure of the control part of the hot water storage type hot-water supply system shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

A hot water storage type hot water supply system A shown in FIG. 1 is configured by combining a heat pump 1 as a main heat source machine and a hot water storage tank unit U.
The heat pump 1 is the same as a conventionally known one. For example, an evaporator 10, a compressor 11, and a condenser that absorb heat from air taken in using a fan 10 a into a circulation path of a refrigerant such as CO ₂ . A heat exchanger 12 for heating hot water and an expansion valve 13 are provided.

  The hot water storage tank unit U includes a hot water storage tank 2, a circulation pump P 1, an auxiliary heat source device 3, and a control unit 4. A lower part and an upper part of the hot water storage tank 2 are connected to the heat exchanger 12 of the heat pump 1 through piping parts 50a and 50b, and a hot water heating circulation path 5 is configured. In the hot water heating circulation path 5, when the circulation pump P1 is driven, hot water is circulated along the paths indicated by arrows N11 to N13. Specifically, the hot water in the hot water storage tank 2 passes through the piping part 50a and is supplied to the heat exchanger 12, and then passes through the piping part 50b and is returned to the upper part in the hot water storage tank 2. During operation of the heat pump 1, hot water is heated by the heat exchanger 12, and heated hot water is sequentially stored in the hot water storage tank 2.

  A water intake pipe 61 is connected to the lower part of the hot water storage tank 2 via a lower pipe section 60, and water supplied to the water inlet 61 a of the water intake pipe 61 can flow into the lower part of the hot water storage tank 2. On the other hand, a hot water discharge pipe 62 having a hot water outlet 62a is connected to the upper part of the hot water storage tank 2. When the hot water tap 90 connected to the hot water outlet 62a is opened, the hot water tank 2 enters the hot water storage tank 2. The hot water in the hot water storage tank 2 flows out into the hot water discharge pipe 62 due to the water pressure, and is supplied toward the hot water tap 90 from the outlet 62a.

The auxiliary heat source unit 3 is used to heat the hot water discharged from the hot water storage tank 2 when the hot water is lower than a predetermined target hot water supply temperature. It is the same. The water inlet side piping section 70a of the auxiliary heat source unit 3 is connected to the upper part of the hot water storage tank 2 via a pump P2 (corresponding to a specific example of an additional pump referred to in the present invention) and a three-way valve V1, while the auxiliary heat source unit 3 is connected to the hot water discharge pipe 62 via the three-way valve V2. When hot water is discharged from the hot water outlet 62a toward the hot water tap 90, the hot water heated by the auxiliary heat source unit 3 is supplied to the hot water outlet 62a by switching the three-way valve V2 as indicated by arrows N21 and N22. It is possible.

  In the hot water storage tank unit U, the auxiliary flow path 7 described below can be switched and set. The auxiliary flow path 7 is a path through which hot water flows along arrows N31 to N35 in FIG. 2 (this part is indicated by a thick line), and a pipe part 71 branched and connected to the hot water outlet side pipe part 70b of the auxiliary heat source unit 3 is provided. It is configured to be connected directly or indirectly to the lower piping part 60 via the three-way valve V3. In a state where the auxiliary flow path 7 is set, when the pump P2 is driven, hot water heated by the auxiliary heat source unit 3 flows into the lower part of the hot water storage tank 2.

  A heat exchanger 92 is appropriately provided in the pipe portion 71. The heat exchanger 92 corresponds to an example of a heat load referred to in the present invention, and is for heating a heat medium for a heating terminal 91 such as a floor heating device. The heat medium can circulate between the heat exchanger 92 and the heating terminal 91 by driving the pump P3. The three-way valves V1 and V3 are connected via a pipe part 63, and hot water that has passed through the heat exchanger 92 and reaches the three-way valve V3 is transferred to the auxiliary heat source unit 3 without passing through the hot water storage tank 2. It can be fed again and heated.

The control unit 4 is configured using a microcomputer or the like, and executes operation control and data processing of each unit of the hot water storage tank unit U. The control unit 4 corresponds to an example of “determination unit” and “control unit” in the present invention. The control unit 4 is provided with an operation switch 40, and executes a control to start a trial operation to be described later when a predetermined switch operation is performed after completion of the water filling operation to each part such as the hot water heating circulation path 5. To do. The operation switch 40 for starting the trial run is not limited to the configuration provided in the control unit 4, and may be configured, for example, in a remote control (not shown) connected to the control unit 4 by communication. it can. The control unit 4 monitors the outlet side temperature of the heat exchanger 12 based on the detection signal of the temperature sensor Sa provided in the heat pump 1 during the trial operation, and when the outlet side temperature rises, Is determined to be normal, and if not, it is determined to determine that the water filling is not normal. The details will be described later.

  Next, the operation of the hot water storage type hot water supply system A will be described. In addition, an example of an operation control procedure by the control unit 4 will be described with reference to the flowchart of FIG.

  First, after the installation work of the hot water storage type hot water supply system A is completed, water filling operation is performed in which water is poured into the hot water storage tank 2 and water is distributed to various parts of the piping connected to the hot water storage tank 2. When such a water filling operation is completed and a predetermined switch operation is performed, the control unit 4 starts a trial run (S1: YES, S2). This trial operation causes hot and cold water flow in the path shown by the thick line in FIG. 2, and after setting the auxiliary flow path 7 described above, the circulation pump P1 and the pump P2 are driven, and the auxiliary heat source unit 3 is installed. It is executed by turning it on. The operation of the heat pump 1 remains stopped.

  During the trial operation, the hot water heated by the auxiliary heat source unit 3 flows into the lower part of the hot water storage tank 2. On the other hand, the hot water in the lower part of the hot water storage tank 2 is sent toward the heat exchanger 12 of the heat pump 1 by the circulation pump P1. Therefore, when water filling is performed appropriately, the hot water heated by the auxiliary heat source device 3 is sent to the heat exchanger 12 of the heat pump 1 and passes through the heat exchanger 12. When such circulation of heated hot water occurs, the outlet side temperature of the heat exchanger 12 detected via the temperature sensor Sa rises. When such a temperature rise occurs, the control unit 4 determines that the water filling is normal and notifies that effect (S3: YES, S4, S5).

  The notification in step S5 is executed by the screen display or the generation of sound (voice message, melody sound, etc.) on the control unit 4 or a remote controller connected to the control unit 4, for example. As a result, the operator can appropriately confirm the determination result. This also applies to the notification operation in step S8 described later. In the above-described determination, even if the temperature on the outlet side of the heat exchanger 12 is increased, the increase width is a slight temperature less than a predetermined width, and the temperature increase is within an error range (auxiliary If it is a small temperature rise that is not recognized as a temperature rise caused by the passage of hot water heated by the heat source device 3, it should not be judged that the water filling is normal. Is possible.

  On the other hand, unlike the above, if the temperature on the outlet side of the heat exchanger 12 does not rise despite the elapse of a predetermined time after the start of the trial operation, the control unit 4 determines that the water filling is not normal. This is notified (S3: NO, S6: YES, S7, S8). If water filling is not properly performed, even if the above-described trial operation is executed for an appropriate time, the hot water heated by the auxiliary heat source unit 3 is not properly sent to the heat exchanger 12, and the outlet side temperature is However, according to the determination method described above, it is possible to grasp such a situation and accurately determine that the water filling is not normal.

According to the series of operation processes described above, it is possible to accurately determine whether or not the water filling is normal. For example, although the water filling is not normal, the heat pump 1 is driven without noticing this, It is possible to appropriately avoid problems such as being in an empty state. In addition, since the control of the trial operation and the determination of whether or not the water filling is normal are executed by the control unit 4, the labor burden on the operator is small, and it is possible to reduce the erroneous determination. .

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the hot water storage type hot water supply system according to the present invention can be variously modified within the range intended by the present invention.

  The auxiliary flow path referred to in the present invention may be any flow path that allows hot water heated by the auxiliary heat source machine to flow into the lower part of the hot water storage tank. You may comprise 71 by connecting directly to the lower part of a hot water storage tank. The temperature sensor Sa for determining whether or not the outlet side temperature of the heat exchanger of the main heat source apparatus has risen does not necessarily have to be provided in the vicinity of the outlet side of the heat exchanger 12, for example, a heat exchanger. It can also be set as the structure provided in the piping part 50b connected to the 12 exit parts.

  The main heat source machine referred to in the present invention is not limited to a heat pump. For example, a fuel cell that generates high-temperature exhaust gas that can be used for hot water heating or a power generation device that uses a gas engine can be used as the main heat source. The auxiliary heat source machine is not limited to the gas combustion type, and may be an electric heater type, for example.

A Hot water storage system
P1 Circulation pump
P2 pump (additional pump)
Sa Temperature sensor 1 Heat pump (main heat source machine)
2 Hot water storage tank 3 Auxiliary heat source machine 4 Control part (judgment means, control means)
5 Hot water heating circulation path 7 Auxiliary flow path 12 Heat exchanger as heat pump condenser (heat exchanger of main heat source machine)
62a Hot water outlet 92 Heat exchanger (heat load)

Claims (2)

By driving the circulation pump, the hot water in the hot water storage tank is supplied from the lower part of the hot water storage tank to the heat exchanger of the main heat source machine and heated, and then returned to the upper part in the hot water storage tank. A heating circulation path;
An auxiliary heat source capable of heating hot water flowing out from the upper part of the hot water storage tank and sent to a predetermined outlet or heat load,
A hot water storage hot water system comprising:
It is possible to set an auxiliary flow path including an additional pump capable of flowing hot water heated by the auxiliary heat source machine into the lower part of the hot water storage tank,
Wherein after the water filling operations to the hot water storage tank and piping section various places connected to the hot water storage tank, and sets the auxiliary flow path, the hot water heated by the auxiliary heat source apparatus by the drive of said additional pump The heated hot water in the lower part of the hot water tank is caused to flow through the hot water heating circulation path by driving the circulation pump in a state where the main heat source machine is stopped while flowing into the lower part of the hot water tank. Trial operation to send out towards the main heat source machine is possible,
During this test operation, if the temperature at the outlet side of the heat exchanger of the main heat source unit rises during the period from the start of the test operation until the lapse of a predetermined time, it is determined that water filling is performed normally, and so If it is not , a hot water storage type hot water supply system comprising a judging means for judging that water filling is not normally performed and notifying the fact . The hot water storage hot water supply system according to claim 1,
The auxiliary heat source unit and the circulation pump drive control, and a control means capable of setting operation control of the auxiliary flow path is provided,
The control means is a hot water storage type hot water supply system configured to start the trial operation when a predetermined switch operation is performed .

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