JP2004257590A - Heat source system - Google Patents

Heat source system Download PDF

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Publication number
JP2004257590A
JP2004257590A JP2003046153A JP2003046153A JP2004257590A JP 2004257590 A JP2004257590 A JP 2004257590A JP 2003046153 A JP2003046153 A JP 2003046153A JP 2003046153 A JP2003046153 A JP 2003046153A JP 2004257590 A JP2004257590 A JP 2004257590A
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Japan
Prior art keywords
hot water
operation
heat
heating
water storage
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2003046153A
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Japanese (ja)
Inventor
Masahito Ochi
Keiji Takimoto
桂嗣 滝本
雅人 越智
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Osaka Gas Co Ltd
大阪瓦斯株式会社
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Priority to JP2003046153A priority Critical patent/JP2004257590A/en
Publication of JP2004257590A publication Critical patent/JP2004257590A/en
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Abstract

An object of the present invention is to improve the operation efficiency of a cogeneration system in a heat source system such as a cogeneration system having a hot water storage tank 4 by avoiding intermittent operation of a heating means N.
A hot water storage tank is provided for storing hot and cold water generated by heating means, and the stored hot and cold water is consumed by a hot and cold water consuming unit. An operation control means for executing a backup heating operation for starting operation of the heating means N when the operation is insufficient, wherein the operation control means performs the backup heating operation after the hot water consumption by the hot water consumption unit K is stopped. The operation of the heating means N is stopped after a predetermined surplus amount of hot water is stored in the hot water storage tank 4.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention includes a hot water storage tank that stores hot water generated by a heating unit, and the stored hot water is consumed by a hot water consuming unit. When the hot water in the hot water storage tank runs short when the hot water is consumed by the hot water consuming unit, the heating is performed. A heat source system comprising an operation control means for executing a backup heating operation for starting the operation of the means, and in particular, as the heating means, an exhaust heat type heating means for generating hot and cold water by heat generated by a cogeneration unit which performs a planned operation; and A cogeneration system including auxiliary heating means for generating hot and cold water by using heat generated by a burner operated in the backup operation.
[0002]
[Prior art]
The heat source system as described above performs a planned operation of a heating means such as a gas burner, a heat pump heater, or an electric heater based on a past heat load or the like, and stores hot and cold water generated by the heating means in a hot water storage tank. The hot water stored in the hot water storage tank is supplied to a hot water tap or a hot water consuming unit such as a bathtub.
[0003]
In addition, a cogeneration system as a heat source system operates a combined heat and power unit composed of a combination of a gas engine and a generator, a fuel cell, etc. based on planned load data such as past power loads and heat loads. Then, hot water is generated by heat generated by the combined heat and power unit during the planned operation by the exhaust heat type heating means, and the hot water is stored in the hot water storage tank.
[0004]
The heat source system, particularly the cogeneration system, is configured such that the operation control means causes the hot water in the hot water storage tank to run short when the hot water is consumed by the hot water consuming unit. In other words, the minimum amount of hot water stored in the hot water storage tank is preset. When the amount is equal to or less than the amount, the above-mentioned heating means, in particular, the auxiliary heating means such as a burner or an electric heater is operated to perform a backup heating operation for heating the temperature consumed in the hot and cold water consuming unit to the required temperature. In some cases.
Then, in this backup heating operation, the operation of the auxiliary heating means is stopped when the consumption of hot water by the hot water consumption unit is stopped (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP 2001-248910 A ([0037] etc.)
[0006]
[Problems to be solved by the invention]
As described above, in the heat source system, when the amount of hot water stored in the hot water storage tank at the time of hot water consumption such as hot water supply becomes equal to or less than the minimum ensured hot water storage amount, the operation of the heating means, particularly, the auxiliary heating means is started, and the hot water consumption is started. By configuring the auxiliary heating means to be stopped when the hot water storage tank is short or when the amount of hot water stored in the hot water storage tank reaches the minimum secured hot water storage amount, hot water consumption can be achieved when the hot water storage capacity in the hot water storage tank is insufficient. The hot water consumption by the unit is intermittently repeated, so that the auxiliary heating means and the like are intermittently operated, and the operating efficiency of the auxiliary heating means may be reduced.
[0007]
In particular, in the cogeneration system, the amount of hot water stored in the hot water storage tank in which the hot water generated by the exhaust heat type heating means of the combined heat and power supply during planned operation was equal to the amount of hot water consumed by the hot water consuming unit. In this case, the overall operation efficiency can be relatively high, but after the water in the hot water storage tank is once short, the auxiliary heating means may be operated intermittently as described above. And the improvement in operation efficiency due to planned operation may be offset.
[0008]
Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide an intermittent operation of a heating unit including an auxiliary heating unit in a heat source system such as a cogeneration system having a hot water storage tank. To improve the operation efficiency of the cogeneration system.
[0009]
[Means for Solving the Problems]
A first characteristic configuration of the heat source system according to the present invention for achieving this object includes a hot water storage tank that stores hot water generated by a heating unit, and the stored hot water is consumed by a hot water consuming unit. A hot water supply in the hot water storage tank at the time of hot water consumption by the section, the operation control means for performing a backup heating operation to start the operation of the heating means, the heat source system comprising:
In the backup heating operation, the operation control unit stops the operation of the heating unit after a predetermined surplus amount of hot water is stored in the hot water storage tank after the hot water consumption is stopped by the hot water consumption unit. It is in the point that it is composed.
[0010]
That is, according to the first characteristic configuration, when the hot water in the hot water storage tank runs short during hot water consumption by the hot water consumption unit, that is, when the hot water storage amount in the hot water storage tank becomes equal to or less than a preset minimum secured hot water storage amount, The operation control means executes the backup heating operation to start the operation of the heating means such as the exhaust heat type heating means and the burner of the combined heat source supply device.In this backup heating operation, the operation of the heating means is performed. Instead of stopping when the hot water consumption is stopped by the hot water consumption unit, even after the hot water consumption is stopped, the hot water is continued until a predetermined surplus amount of hot water is stored in the hot water storage tank in addition to the minimum secured hot water storage amount. Even if the hot water consumption by the hot water consuming unit is resumed immediately after the operation of the heating means is stopped, there is no need to operate the heating means until the surplus amount of hot water is consumed. It is possible to avoid intermittent operation, it is possible to achieve the overall operational efficiency.
[0011]
The second characteristic configuration of the heat source system according to the present invention is characterized in that, in addition to the first characteristic configuration, the operation control unit performs a planned operation of the heating unit to supply hot water corresponding to the predicted heat load in the hot water storage tank. It is configured to execute the planned driving operation to be stored.
[0012]
That is, according to the second characteristic configuration, when the operation control unit performs the planned operation of the heating unit to store hot water in the hot water storage tank to cover the predicted heat load in the hot water consumption unit, Even when the amount of hot water stored in advance is insufficient, as described above, the intermittent operation of the heating means can be avoided, and a decrease in the overall operation efficiency can be suppressed.
[0013]
In a third characteristic configuration of the heat source system according to the present invention, in addition to the second characteristic configuration, in the backup heating operation, the operation control unit may be configured to respond to the predicted heat load within a predetermined period after the stop of hot water consumption. Thus, the surplus amount is determined.
[0014]
That is, according to the third feature configuration, in the backup heating operation, the operation of the heating unit is maintained within a predetermined period after the stoppage of hot water consumption, with reference to the predicted heat load used for the planned operation of the heating unit. By determining the surplus amount, which is the amount of hot water to be stored in the hot water storage tank, according to the predicted heat load within the predetermined period, the amount of hot water corresponding to the predicted heat load is stored in the hot water storage tank. In addition, intermittent operation of the heating means can be avoided, and the hot water in the hot water storage tank can be consumed without waste, so that the overall operation efficiency can be further improved.
Further, when the predicted heat load within the predetermined period is 0, that is, when there is no load, the surplus amount may be determined to be 0, and the heating means may be stopped when the hot water consumption of the hot water consuming unit is stopped.
[0015]
A fourth feature configuration of the heat source system according to the present invention is the above-described first to third feature configurations, in which the operation control unit performs the heating in the backup heating operation within a predetermined period after the heating unit is stopped. An instantaneous restart state in which the operation of the means is restarted is detected, and when the instantaneous restart state is continuously detected a predetermined number of times, the surplus amount is increased and set.
[0016]
That is, according to the fourth characteristic configuration, when the backup amount is set to, for example, 0 or a small amount and the backup heating operation is performed, the operation of the heating unit is restarted within a predetermined period after the stop of the heating unit. If the instantaneous restart state is detected one or more predetermined times consecutively, the surplus amount is further increased and set, so that the frequency at which the instantaneous restart state is continuously detected decreases. That is, the intermittent operation of the heating means can be appropriately avoided in accordance with the state of hot and cold water consumption, and a decrease in operating efficiency can be further avoided.
[0017]
According to a fifth aspect of the heat source system according to the present invention, in addition to the first to fourth aspects, the heating unit is configured to use an exhaust heat type heating unit that generates hot and cold water by using heat generated by the cogeneration unit that performs the planned operation. And auxiliary heating means for generating hot and cold water by the heat generated by the burner when operated in the backup operation.
[0018]
That is, according to the fifth characteristic configuration, even when the heat source system of the present invention is configured as a so-called cogeneration system having the exhaust heat type heating unit of the cogeneration system and the auxiliary heating unit as the heating unit, the auxiliary heating is also performed. The operation efficiency of the cogeneration system can be improved by avoiding intermittent operation of the means.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An example in which the heat source system according to the present invention is adapted to a cogeneration system will be described with reference to the drawings.
[0020]
As shown in FIGS. 1 and 2, the cogeneration system utilizes a cogeneration system 3 configured to drive a power generation device 2 by a gas engine 1 and heat generated by the cogeneration system 3. Meanwhile, a hot water storage unit 6 for storing hot water in the hot water storage tank 4 and supplying a heat medium to the heat consuming terminal 5, and an operation control unit 7 as operation control means for controlling operations of the combined heat and power supply device 3 and the hot water storage unit 6 are configured. Have been.
[0021]
On the output side of the power generation device 2, an inverter 8 for system linkage is provided, and the inverter 8 sets the output power of the power generation device 2 to the same voltage and the same frequency as the power supplied from the commercial system 9. It is configured.
The commercial system 9 is, for example, a single-phase three-wire 100/200 V, and is electrically connected to a power load 11 such as a television, a refrigerator, and a washing machine via a commercial power supply line 10.
The inverter 8 is electrically connected to the commercial power supply line 10 via the cogeneration supply line 12, and the generated power from the power generator 2 is supplied to the electric load 11 via the inverter 8 and the cogeneration supply line 12. It is configured to supply.
[0022]
The commercial power supply line 10 is provided with a power load measuring means 13 for measuring the load power of the power load 11, and the power load measuring means 13 generates a reverse flow in the current flowing through the commercial power supply line 10. It is also configured to detect whether or not to perform.
Then, the power supplied from the power generator 2 to the commercial power supply line 10 is controlled by the inverter 8 so that the reverse power flow does not occur, and the surplus power of the generated power is generated by replacing the surplus power with heat instead of heat. It is configured to be supplied to the heater 14.
[0023]
The electric heater 14 is composed of a plurality of electric heaters, is provided so as to heat the cooling water of the gas engine 1 flowing through the cooling water circulation path 15 by the operation of the cooling water circulation pump 17, and is provided on the output side of the power generator 2. ON / OFF is switched by the connected operation switch 16.
The operation switch 16 is configured to adjust the power consumption of the electric heater 14 according to the magnitude of the surplus power so that the power consumption of the electric heater 14 increases as the magnitude of the surplus power increases. I have.
[0024]
The hot water storage unit 6 includes a hot water storage tank 4 for storing hot water in a state where a temperature stratification is formed, a hot water / heat source circulation path 33 for circulating hot water or a hot water in the hot water storage tank 4, and a hot water / heat source circulation path 33 thereof. A hot-water / heat-source circulating pump 34 for circulating hot water in the hot-water storage tank 4 and circulating hot-water for the heat source, a heat medium circulating pump 23 for circulating and supplying the heat medium to the heat consuming terminal 5 through the heat medium circulating path 22, A heat medium heating heat exchanger 26 for heating the heat medium flowing through the medium circulation path 22 is provided.
Incidentally, the amount of hot water stored in the hot water storage tank 4 is configured to be detected based on detection information of a plurality of thermistors S provided in the hot water storage tank 4.
[0025]
The hot water / heat source circulation path 33 is connected to a take-out path 35 communicating with the lower part of the hot water storage tank 4 and a hot water storage path 36 communicating with the upper part of the hot water storage tank 4, and a hot water storage valve 37 is provided in the hot water storage path 36. ing.
In the hot water / heat source circulation path 33, the exhaust heat type heat exchanger 38, the hot water / heat source circulation pump 34, and the auxiliary heating heat exchanger 29 are arranged in the order of the hot water circulation from the connection point with the take-out path 35. An interrupting valve 39 for interrupting the flow of hot and cold water, and a heat exchanger 26 for heating a heating medium are provided.
[0026]
In the exhaust heat type heat exchanger 38, the hot water flowing through the hot water / heat source circulation path 33 is passed through the cooling water of the cooling water circulation path 15 in which the heat generated by the cogeneration system 3 is recovered. It is configured to be heated.
The exhaust heat type heating means N is constituted by an exhaust heat type heat exchanger 38.
[0027]
The auxiliary heating means M includes a fan 27, a burner 28, and a heat exchanger 29 for auxiliary heating, and the auxiliary heating means M is a hot water / heat source circuit by burning the burner 28 with the fan 27 operating. 33 is configured to heat the hot and cold water flowing therethrough.
[0028]
In the heat medium heating heat exchanger 26, the heat medium circulation path 22 flows through the heat medium hot water heated by the exhaust heat heat exchanger 38 and the auxiliary heating heat exchanger 29. The heating medium to be heated is configured to be heated.
The heat consuming terminal 5 includes a heating terminal such as a floor heating device or a bathroom heating device.
[0029]
Further, a hot water supply load measuring means 31 is provided for measuring the hot water supply heat load when hot water is taken out from the hot water storage tank 4 to the hot water supply path 50 communicating with the upper part of the hot water storage tank 4. Is also provided.
[0030]
First, the planned operation of the combined heat and power supply device 3 by the operation control unit 7 will be described.
The operation control unit 7 performs a data update process of updating and storing one day of past load data in a state of being associated with a day of the week based on an actual use situation. It is configured to perform a predicted load calculation process of obtaining predicted load data for one day from the past load data for the day.
Then, in a state in which the predicted load data for the day is obtained, the operation control unit 7 determines whether or not to operate the cogeneration system 3 based on the predicted load data every time one hour as a unit time elapses. The energy saving standard value calculation process for obtaining the standard energy saving standard value is performed, and the actual energy saving level at the present time is higher than the energy saving standard value obtained by the energy saving standard value calculation process. It is configured to perform an operation availability determination process of determining whether the combined heat and power supply device 3 can be operated.
[0031]
In this way, when the operation control unit 7 determines in the operation availability determination processing that the operation of the cogeneration system 3 is permissible, the operation control unit 7 operates the cogeneration system 3 for a unit time up to one hour from that point. It is configured to be set as an operation time zone, to operate the cogeneration system 3 during the operation time zone, and to stop the operation of the cogeneration system 3 when it is determined that the operation of the cogeneration system 3 is not possible. ing.
[0032]
When the amount of hot water stored in hot water storage tank 4 is full during the operation time zone, operation control unit 7 sets the operation continuation time from the start of operation of combined heat and power supply device 3 for a set time (for example, one hour). If the above is the case, the operation of the combined heat and power supply device 3 is stopped, and if the operation continuation time is shorter than the set time (for example, one hour), even if the hot water storage amount in the hot water storage tank 4 becomes full, The configuration is such that the operation of the cogeneration system 3 is continued until the operation continuation time becomes equal to or longer than a set time (for example, one hour).
[0033]
The data update process will be described in detail. One day's past load data indicating how much power load, hot water supply heat load as a heat load, and heating heat load are present at which time zone in a day is associated with a day of the week. It is configured to be updated and stored in the state.
[0034]
First, the past load data will be described. The past load data is composed of three types of load data: electric power load data, hot water supply heat load data, and heating heat load data. As shown in FIG. Is stored in a state of being divided for each day of the week from Sunday to Saturday.
Then, the past load data for one day includes 24 power load data per unit time, 24 hot water supply heat load data per unit time, and 1 hour per 24 hours as a unit time. Heating heat load data of 24 pieces.
[0035]
When the configuration for updating the past load data as described above is added, the power load, the hot water supply heat load, and the heating heat load per unit time are respectively determined from the actual use status by the power load measurement unit 13 and the hot water supply unit. The actual load data for one day is measured in the heat load measuring means 31 and the heating heat load measuring means 32, and the measured load data is stored in association with the day of the week.
Then, when the actual load data for one day is stored for one week, new past load data is obtained by adding the past load data and the actual load data at a predetermined ratio for each day of the week. It is configured to store new past load data and update the past load data.
[0036]
Specifically, taking Sunday as an example, as shown in FIG. 3, the past load data D1m corresponding to Sunday among the past load data, and the actual load data A1 corresponding to Sunday among the actual load data, as shown in FIG. From the following [Equation 1], new past load data D1 (m + 1) corresponding to Sunday is obtained, and the obtained past load data D1 (m + 1) is stored.
In the following [Formula 1], D1m is past load data corresponding to Sunday, A1 is actual load data corresponding to Sunday, K is a constant of 0.75, and D1 (m + 1) is And new past load data.
[0037]
(Equation 1)
D1 (m + 1) = (D1m × K) + {A1 × (1-K)}
[0038]
The prediction load calculation process will be described in detail. The prediction load calculation process is executed every time the date changes, and a predicted load for one day indicating how much power load, hot water heat load, and heating heat load are predicted in which time zone of the day. It is configured to seek data.
That is, of the seven past load data for each day of the week, the past load data corresponding to the day of the day of the day and the actual load data of the day before are added at a predetermined ratio, so that how much power load and hot water It is configured to determine the predicted load data for one day of the day on whether the thermal load and the heating thermal load are predicted.
[0039]
This will be described in detail by taking as an example a case where predicted load data for one day on Monday is obtained. As shown in FIG. 3, seven past load data D1m to D7m for each day of the week and seven actual load data A1 for each day of the week. AA7 are stored, and from the past load data D2m corresponding to Monday and the actual load data A1 corresponding to Sunday the previous day, the predicted load data for one day on Monday is calculated by the following [Equation 2]. Find B.
As shown in FIG. 4, the one-day predicted load data B includes one-day predicted power load data, one-day predicted hot water supply heat load data, and one-day predicted heating heat load data. 4A shows the predicted power load for one day, FIG. 4B shows the predicted hot water supply heat load for one day, and FIG. The forecast heating heat load for the day is shown.
In the following [Equation 2], D2m is past load data corresponding to Monday, A1 is actual load data corresponding to Sunday, Q is a constant of 0.25, and B is a predicted load data. Data.
[0040]
(Equation 2)
B = (D2m × Q) + {A1 × (1-Q)}
[0041]
The energy-saving degree reference value calculation processing will be described in further detail. The processing is executed every one hour, which is a unit time, and is required from the present time to the reference value time destination using the predicted hot water supply heat load data. When the combined heat and power supply device 3 is operated so as to cover the required amount of hot water storage, an energy saving degree reference value that can realize energy saving by operating the combined heat and power supply device 3 is obtained.
[0042]
For example, assuming that the unit time is 1 hour and the reference value time is 12 hours, first, a predicted power load, a predicted hot water supply heat load, and a predicted heating heat load based on the predicted load data are calculated as follows: As shown in FIG. 5, the predicted energy savings in the case where the combined heat and power supply device 3 is operated are calculated for every 12 hours up to 12 hours ahead every hour, and when the combined heat and power supply device 3 is operated. The predicted hot water storage amount that can be stored in the hot water storage tank 3 is calculated for every 12 hours up to 12 hours ahead every hour.
[0043]
[Equation 3]
Energy saving degree P = {(EK1 + EK2 + EK3) / necessary energy of combined heat and power supply device 3} × 100
[0044]
Here, EK1 is a function having the effective power generation output E1 as a variable, EK2 is a function having E2 as a variable, and EK3 is a function having E3 as a variable.
Required energy of cogeneration unit 3: 5.5 kW
(The required amount of city gas when the cogeneration system 3 is operated for one hour is 0.433 m3.)
Unit power generation required energy: 2.8kW
Burner efficiency (at heating): 0.8
Burner efficiency (at the time of hot water supply): 0.9
[0045]
Further, each of the effective power generation output E1, the heating heat output E2, and the effective hot water storage heat output E3 is obtained by the following [Equation 4] to [Equation 6].
[0046]
(Equation 4)
E1 = power consumption at power load 11 = power generated by cogeneration unit 3− (power consumption of electric heater 14 + power consumption of various auxiliary machines)
By the way, the various auxiliary machines are devices and machines used in this cogeneration system in an auxiliary manner, and correspond to the cooling water circulation pump 17, the hot water / heat source circulation pump 34, and the like.
[0047]
(Equation 5)
E2 = heat consumption at the heat consuming terminal 5
[0048]
(Equation 6)
E3 = (The amount of heat generated in the cogeneration unit 3 + The amount of heat recovered by the electric heater 14-Heating heat output E2) -The heat dissipation loss
Here, the amount of heat recovered by the electric heater 14 = power consumption of the electric heater 14 x thermal efficiency of the heater.
[0049]
Then, as shown in FIG. 5, in a state where the predicted energy saving degree and the predicted hot water storage amount per hour are obtained for 12 pieces, first, the predicted required hot water storage required 12 hours ahead from the predicted hot water supply heat load data. The required amount of hot water is calculated by subtracting the amount of hot water stored in the hot water storage tank 4 at the present time from the predicted required amount of hot water to be obtained by 12 hours.
For example, if the hot water supply heat load of 9.8 kW is predicted 12 hours later from the predicted hot water supply heat load data, and the hot water storage amount in the hot water storage tank 4 at this time is 2.5 kW, the time until 12 hours ahead The required amount of hot water storage is 7.3 kW.
[0050]
Then, in a state in which the predicted hot water storage amounts of the unit time are added, until the sum of the predicted hot water storage amounts reaches the required hot water storage amount, of the unit time for twelve units, select one having a higher numerical value of the predicted energy saving degree. I'm going to go.
[0051]
To add an explanation, for example, as described above, if the required hot water storage amount is 7.3 kW, first, as shown in FIG. The time is selected, and the predicted hot water storage amount in the unit time is added.
Next, a unit time from 6 hours ahead to 7 hours ahead with a high predicted energy saving degree is selected, and the predicted hot water storage amount in the unit time is added up, and the total predicted hot water storage amount at that time becomes 1.1 kW.
In addition, a unit time from 5 hours ahead to 6 hours ahead with the next highest predicted energy saving degree is selected, and the predicted hot water storage amount in the unit time is added, and the total predicted hot water storage at that time becomes 4.0 kW. .
[0052]
In this way, when the selection of the unit time from the one with the higher predicted energy saving degree and the addition of the predicted hot water storage amount are repeated, as shown in FIG. 5, the unit time from 8 hours ahead to 9 hours ahead is obtained. When is selected, the sum of predicted hot water storage amounts reaches 7.3 kW.
Then, the energy saving degree for the unit time from 8 hours to 9 hours ahead is set as the energy saving reference value. In the example shown in FIG.
[0053]
The operation availability determination process will be described in further detail. The process is performed each time one hour as a unit time elapses, and the above-mentioned [number] is calculated based on the current power load, the predicted hot water supply heat load, and the current heating heat load. 3], the current energy saving degree is obtained.
When the current energy saving level is higher than the energy saving standard value, it is determined that the operation of the combined heat and power unit 3 is possible. When the current energy saving level is less than the energy saving standard value, the operation of the combined heat and power apparatus 3 is disabled. It is determined.
[0054]
By the operation planning operation as described above, the planned operation of the combined heat and power supply device 3 can be performed to store the required amount of hot water in the hot water storage tank 4 according to the predicted hot water supply heat load.
[0055]
Next, the hot water storage operation, the heat medium supply operation, and the hot water supply operation by the operation control unit 7 will be described.
In the hot water storage operation, the hot water / heat source circulation pump 34 is operated to take out hot water from the lower part of the hot water storage tank 4 to the hot water / heat source circulation path 33 and pass the hot water through the exhaust heat type heat exchanger 38. After heating to the set temperature for hot water storage, the hot water is returned to the upper part of the hot water storage tank 4 and hot water of the set temperature for hot water storage is stored in the hot water storage tank 4.
Then, the opening degree of the hot water storage valve 37 and the intermittent valve 39 is adjusted so that the temperature of the hot water that has passed through the exhaust heat type heat exchanger 38 becomes the hot water storage set temperature.
[0056]
The heat medium supply operation is performed by operating the hot water / heat source circulation pump 34 in a state where the hot water storage valve 37 is closed and the intermittent valve 39 is opened. The hot water for the heat source is heated by at least one of the heat exchangers 29 and the heated hot water for the heat source is circulated while passing through the heat exchanger 26 for heating medium heating. The heat medium heated by the hot water is circulated and supplied to the heat consuming terminal 5.
[0057]
Regarding the heating of the hot water, the cooling water circulation pump 17 is operated to heat the hot water in the exhaust heat exchanger 38 when the cogeneration system 3 is operating. .
When the current heating heat load required by the heat consuming terminal 5 is smaller than the heating amount in the exhaust heat type heat exchanger 38, the heating heat load required by the heat consuming terminal 5 is covered. Meanwhile, the opening degree of the hot water storage valve 37 is adjusted so as to store hot water in the hot water storage tank 4.
When the current heating heat load required by the heat consuming terminal 5 cannot be covered only by the cooling water from the cogeneration device 3 or when the cogeneration device 3 is not operating, the auxiliary heating means M By operating in the heating state, the auxiliary heating heat exchanger 29 is configured to heat the hot water for heat source.
[0058]
The operation control unit 7 is in a state in which the amount of hot water stored in the hot water storage tank 4 is full, heat is not required by the heat consuming terminal 5, and heat is generated by the combined heat and power supply device 3. And a radiating operation for radiating heat generated in the combined heat and power supply device 3.
That is, in the heat dissipation operation, the hot water / heat source circulation pump 34 is operated in a state where the hot water storage valve 37 is closed and the intermittent valve 39 is opened. The hot water is heated, and heat is radiated from the hot water for the heat source heated in the exhaust heat exchanger 38 in the auxiliary heating heat exchanger 29.
[0059]
In the hot water supply operation, hot water is supplied from the hot water storage tank 4 through the hot water supply path 50 to the hot water tap unit or the hot water consumption unit K in the bathtub with the intermittent valve 39 closed.
In addition, during the hot water supply operation or the like, the operation control unit 7 determines that when the amount of hot water stored in the hot water storage tank 4 detected based on the detection information of the thermistor S becomes equal to or less than a preset lowest-probable-report hot water storage amount, The backup heating operation is executed to start the operation of the auxiliary heating means M, and the hot water storage operation starts storing hot water in the hot water storage tank 4.
[0060]
Further, in the backup heating operation, the operation control unit 7 appropriately holds the operation of the auxiliary heating means M even after the hot water consumption is stopped in the hot water consumption unit K, and sets the operation to 10 L or the like in the hot water storage tank 4. The operation of the auxiliary heating means M is stopped after the surplus amount of hot and cold water is stored. That is, even if the hot and cold water consumption of the hot and cold water consuming unit K is performed intermittently, the auxiliary heating means M can be continuously operated, and a decrease in the operating efficiency due to the intermittent operation of the auxiliary heating means M can be avoided. it can.
[0061]
Further, the operation control unit 7 performs the backup heating operation and determines the surplus amount of hot water stored in the hot water storage tank 4 based on a predicted hot water supply load as a predicted heat load within a predetermined period after the stop of the hot water consumption. Can be determined.
[0062]
Specifically, when the hot water supply heat load measuring unit 31 recognizes that the hot water consumption of the hot water consumption unit K has been stopped in the backup heating operation, the operation control unit 7 performs the above-described predicted hot water supply heat load data. With reference to, for example, it is determined whether or not there is a predicted hot water supply load within a predetermined period up to ten minutes later.
When the predicted hot water supply heat load exists within the predetermined period, the surplus amount is determined to be, for example, 10 L, and conversely, when the predicted hot water supply heat load does not exist within the predetermined period, By determining the surplus amount to be, for example, 0 L, the hot water in the hot water storage tank 4 is consumed without waste, and the overall operation efficiency is further improved.
[0063]
When the surplus amount is determined according to the predicted hot water supply load within a predetermined period, the surplus amount may be determined to be the amount of hot water that can cover the predicted hot water supply load.
[0064]
[Another embodiment]
<1> In the above embodiment, in order to further avoid intermittent operation of the auxiliary heating means M, the surplus amount used for the backup heating operation is set according to the predicted heat load. The setting may be made based on the operation state of the auxiliary heating means M.
That is, when the backup heating operation is performed, the operation control unit 7 sets the instantaneous restart state in which the operation of the auxiliary heating unit M is restarted within a predetermined period such as 10 minutes after the auxiliary heating unit M is stopped. Configure to detect. Then, the initial surplus amount is initially set to 0 L or a smaller amount, a backup heating operation is performed, and the instantaneous restart state is detected one or more predetermined times consecutively. The intermittent operation of the auxiliary heating means M can be avoided by setting the surplus amount to be increased by, for example, 10 L.
[0065]
<2> In the above-described embodiment, an example in which the heat source system according to the present invention is applied to a cogeneration system has been described. However, the heat source system according to the present invention separately includes a gas burner and a heat pump type without generating electric power. The main heating means such as a heater or an electric heater is operated, for example, as planned, hot water generated by the main heating means is stored in a hot water storage tank, and the hot water stored in the hot water storage tank is stored in a hot water tap or a bathtub. And so on, in which case the heating means operated in the backup heating operation is also provided as a separate auxiliary heating means as the main heating means. It does not matter.
[0066]
<3> In the above embodiment, in the backup heating operation, the surplus amount of hot water to be stored in hot water storage tank 4 is determined based on the predicted hot water supply load within a predetermined period from the stop of the hot water consumption. The surplus amount may be set to a constant value such as 10 L regardless of the predicted hot water supply load.
[0067]
【The invention's effect】
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a cogeneration system according to an embodiment.
FIG. 2 is a block diagram of a cogeneration system.
FIG. 3 is an explanatory diagram in a data update process.
FIG. 4 is a graph showing a predicted load for one day.
FIG. 5 is an explanatory diagram of an energy saving degree reference value calculation process.
[Explanation of symbols]
3: Cogeneration system
4: Hot water storage tank
6: Hot water storage unit
7: Operation control unit
13: Power load measuring means
28: Burner
29: Heat exchanger for auxiliary heating
31: Hot water supply load measuring means
32: Heating heat load measuring means
N: Exhaust heat type heating means
M: auxiliary heating means
K: Hot and cold water consumption department

Claims (5)

  1. The hot water generated by the heating means is stored, and a hot water storage tank is provided in which the stored hot water is consumed by the hot water consuming unit. Operation control means for performing a backup heating operation to be started, and a heat source system,
    In the backup heating operation, the operation control unit stops the operation of the heating unit after a predetermined surplus amount of hot water is stored in the hot water storage tank after the hot water consumption is stopped by the hot water consumption unit. Heat source system made up.
  2. 2. The heat source system according to claim 1, wherein the operation control unit is configured to perform a planned operation of the heating unit to execute a planned operation operation of storing hot water corresponding to the predicted heat load in the hot water storage tank. 3.
  3. The heat source system according to claim 2, wherein the operation control means determines the surplus amount in the backup heating operation according to the predicted heat load within a predetermined period after the stoppage of hot water consumption.
  4. The operation control unit detects an instantaneous restart state in which the operation of the heating unit is restarted within a predetermined period after the stop of the heating unit in the backup heating operation, and continuously detects the instantaneous restart state a predetermined number of times. The heat source system according to any one of claims 1 to 3, wherein the surplus amount is set to be increased when the setting is made.
  5. The heating means comprises: an exhaust heat type heating means for generating hot and cold water by heat generated by the combined heat and power apparatus which performs the planned operation; and The heat source system according to claim 1.
JP2003046153A 2003-02-24 2003-02-24 Heat source system Pending JP2004257590A (en)

Priority Applications (1)

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Publication Number Publication Date
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Country Link
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111755A2 (en) 2005-04-21 2006-10-26 Clean Heat Provision Limited Hot water installations
JP2007247968A (en) * 2006-03-15 2007-09-27 Osaka Gas Co Ltd Cogeneration system
JP2007247967A (en) * 2006-03-15 2007-09-27 Osaka Gas Co Ltd Cogeneration system
JP2008241208A (en) * 2007-03-28 2008-10-09 Osaka Gas Co Ltd Cogeneration system
KR101482845B1 (en) * 2012-04-20 2015-01-14 린나이코리아 주식회사 Storage type hot water supply system
KR101482844B1 (en) * 2012-04-20 2015-01-14 린나이코리아 주식회사 Heat pump heat source system
KR101482846B1 (en) * 2012-04-20 2015-01-14 린나이코리아 주식회사 Storage type hot water supply system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111755A2 (en) 2005-04-21 2006-10-26 Clean Heat Provision Limited Hot water installations
WO2006111755A3 (en) * 2005-04-21 2007-05-03 Clean Heat Provision Ltd Hot water installations
JP2007247968A (en) * 2006-03-15 2007-09-27 Osaka Gas Co Ltd Cogeneration system
JP2007247967A (en) * 2006-03-15 2007-09-27 Osaka Gas Co Ltd Cogeneration system
JP2008241208A (en) * 2007-03-28 2008-10-09 Osaka Gas Co Ltd Cogeneration system
KR101482845B1 (en) * 2012-04-20 2015-01-14 린나이코리아 주식회사 Storage type hot water supply system
KR101482844B1 (en) * 2012-04-20 2015-01-14 린나이코리아 주식회사 Heat pump heat source system
KR101482846B1 (en) * 2012-04-20 2015-01-14 린나이코리아 주식회사 Storage type hot water supply system

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