JP5937034B2 - Operation control method for cold / hot water supply system - Google Patents

Description

  The present invention relates to an operation control technique for a cold / hot water supply system using a plurality of heat source units including a cold / hot water simultaneous supply heat source unit as a supply source.

Conventionally, a cold / hot water simultaneous supply system using a heat pump heat source machine (for example, an absorption cold / hot water machine) capable of simultaneously supplying cold water and hot water is known. The cold / hot water simultaneous supply heat source machine is characterized by high heat efficiency and excellent energy saving because the exhaust heat accompanying the cooling operation can be used for heating.
However, when such a heat source unit is used alone and the outlet temperature control is performed in accordance with one of the cooling load or the hot water supply / heating load, the other outlet temperature becomes a result, and the cold water temperature management is severe. There is a problem that it is difficult to introduce it into.
In this case, even if multiple cold / hot water simultaneous supply heat source units are used, the outlet temperature of each heat source unit is different in normal unit control, and it is difficult to maintain the cold water or hot water temperature after aggregation at the set value. is there.

  In order to cope with the above problem, a technology is disclosed in which one of a plurality of connected cold / hot water simultaneous supply heat source machines (for example, absorption cold / hot water machines) is entrusted to start / stop of other heat source machines and set outlet temperature control. (For example, Patent Document 1). Specifically, when the load is large, the standard outlet temperature (for example, 7 ° C.) is set for all the heat source units. Also, under the condition that some heat source machines are stopped with a small load, the outlet temperature of the operating heat source machine is set to a temperature lower than the standard outlet temperature (for example, 6 ° C.) and adjusted to the standard outlet temperature at the junction. It is something to control.

JP 2001-221541 A

According to the technique of Literature 1, it is possible to adjust the cold water or hot water temperature of the joining part to a set value, but there is no disclosure regarding a technique for adjusting the joining part temperature to the standard outlet temperature for both cold water and hot water.
In order to solve such problems, an object of the present invention is to provide an operation control technique for a cold / hot water supply system that can adjust both the merging temperature of cold water and hot water to a set value (standard outlet temperature).

The gist of the present invention is as follows. That is, the operation control method of the cold / hot water supply system according to the present invention is as follows:
(1) Each includes one or more cold / hot water simultaneous supply heat source machines, cold water heat source machines, and hot water heat source machines,
In the cold / hot water supply system that combines the cold water or hot water produced by each heat source machine and distributes and distributes them to the load side,
When at least one of the one or more cold water heat source machines or hot water heat source machines is in operation,
About cold / hot water simultaneous supply heat source machine, while operating to satisfy either load of cold water or hot water,
The heat source unit during operation (hereinafter referred to as a stabilized heat source unit) is operated so as to supplement the other load that is insufficient.

(2) In the invention of (1) above, the temperature at the outlet of the stabilizing heat source unit is controlled so that the temperature of the hot water or the cold water at the junction is maintained within a predetermined supply temperature range in complementing the other load. It is characterized by that.

(3) In the inventions of (1) and (2) above, when the stabilized heat source device is a cold water heat source device, each cold water heat source device at a predetermined time interval,
The previous chilled water state (Sm () determined in accordance with the previous chilled water temperature (Tcs (r-1)) (r: number of repetitions) and the chilled water outlet set temperature (CT (r-1)) of each heat source unit r-1): m = 1 to 4), and
This time chilled water temperature (Tcs (r))
Based on the above, by repeatedly determining the chilled water outlet set temperature (CT (r)) of each heat source unit this time, the chilled water temperature range (Tcs) is controlled to the target chilled water temperature range And

(4) In the inventions of (1) and (2) above, in the case where the stabilizing heat source device is a hot water heat source device, each hot water heat source device at a predetermined time interval,
The previous junction hot water temperature (Ths (r-1)) (r: number of repetitions) and the deviation from the standard temperature (HTs) of the hot water outlet set temperature (HT (r-1)) of each heat source unit Previously determined hot water condition (Sm (r-1): m = 5-8),
The current hot water temperature at the junction (Ths (r))
By repeatedly determining the hot water outlet set temperature (HT (r)) of each heat source machine based on
The junction hot water temperature (Ths) is controlled to a target hot water temperature range.

According to the present invention, even if the temperature of the cold water or hot water supplied from the cold / hot water simultaneous supply heat source machine becomes a matter of course, the temperature of the cold water or the hot water header at the junction is made close to the target value. By controlling the outlet set temperature, it is possible to supply cold / hot water having a stable temperature to a building or the like to be air-conditioned. As a result, it is possible to introduce a cold / hot water simultaneous supply heat source machine that is excellent in energy saving even for buildings where cold / hot water temperature management is severe.
Moreover, in the system using the electric cold / hot water simultaneous supply heat source machine, although the cold water temperature is ensured using the heat storage tank, there is a case where there is a heat radiation loss, which is not desirable from the viewpoint of energy saving.
According to the present invention, the temperature of the cold / hot water can be secured in real time by using another heat source device, so that there is an effect that high energy saving performance can be realized while stably securing the supply temperature.

1 is a diagram illustrating an overall configuration of a cold / hot water supply system 1 according to an embodiment of the present invention. It is a figure which shows the operation control flow of the cold / hot water supply system. It is a figure which shows the cold water temperature stabilization control flow by the cold water heat source unit 3 at the time of the hot water main mode driving | operation of the cold / hot water simultaneous supply heat source unit 2. It is a figure which shows the setting flow (the 1) of cold water exit preset temperature. It is a figure which shows the setting flow (the 2) of cold water exit preset temperature. It is a figure which shows the setting flow (the 3) of cold water exit preset temperature. It is a figure which shows the setting flow (the 4) of cold water exit preset temperature. It is a figure which shows the setting flow (the 5) of cold water exit preset temperature. It is a figure (table A) which shows the relationship between the last cold water state Sm (r-1), the deviation temperature from the current cold water flow header temperature (Tcs) and the target temperature (Tt), and the outlet set temperature (CT_j). It is a figure which shows the control aspect of the outlet preset temperature (CT_j) of the stabilization heat source machine corresponding to a cold water going header temperature (Tcs) state. It is a figure which shows the warm water temperature stabilization control flow by the hot water heat source unit 4 at the time of the cold water main mode driving | operation of the cold / hot water simultaneous supply heat source unit 2. It is a figure which shows the setting flow (the 1) of warm water exit preset temperature. It is a figure which shows the setting flow (the 2) of warm water exit preset temperature. It is a figure which shows the setting flow (the 3) of warm water exit preset temperature. It is a figure which shows the setting flow (the 4) of warm water exit preset temperature. It is a figure which shows the setting flow (the 5) of warm water exit preset temperature. It is a figure (table B) which shows the relationship between the previous warm water state Sm (r-1), the temperature difference between the current warm water flow header temperature (Ths) and the target temperature (Tt '), and the outlet set temperature (HT_k). . It is a figure which shows the control aspect of the outlet preset temperature (HT_k) of the stabilization heat source machine corresponding to a warm water going header temperature (Ths) state.

Hereinafter, an embodiment of the present invention will be described in more detail. Needless to say, the scope of the present invention is described in the claims and is not limited to the following embodiments.
Referring to FIG. 1, a cold / hot water supply system 1 according to the present embodiment consumes cold water / hot water produced by the heat source machine system 1A that manufactures cold water / hot water and supplies it to the load side, and the heat source machine system 1A. The cold water and hot water produced by the load system 1B and the heat source machines 2, 3, and 4 belonging to the heat source system 1A are aggregated and distributed to the load system 1B, and the return water from the load system 1B is aggregated The supply system 1C recirculates to the heat source system 1A and the control system 1D that controls the entire system.

<System configuration>
The heat source system 1A includes one or more cold / hot water simultaneous supply heat source machines 2 (for example, absorption cold / hot water machine: hereinafter, abbreviated cold / hot water heat source machine 2 or heat source machine 2), and a cold water heat source. A machine (for example, an electric chiller) 3 and a hot water heat source machine (for example, a hot water boiler) 4 are configured.

The load system 1B is configured by a plurality of consumer groups (customers 9 (1) to 9 (n)) such as district heat supply, business use, and industrial use.
The supply system 1C collects the cold water or hot water produced by each heat source unit and distributes it to each customer on the outgoing water side cold water header 5 and hot water header 7, and the return water from each customer to collect each heat source. The return water side cold water header 6 to be returned to the machine, the hot water header 8, a primary side pipe group connecting each heat source machine and each header, and a secondary side pipe group connecting each customer and each header. ing.

Thermometers 13 and 14 for measuring the cold water temperature Tcs or the hot water temperature Ths in the header are arranged on the outgoing water side cold water header 5 and the hot water header 7, respectively.
The return water pipes 6a (1) to 6a (n) connecting the consumers 9 (1) to 9 (n) and the return water side cold water header 6 have flow meters Fc (i) (i = 1 to n), respectively. It is intervened. Further, the return water pipes 8a (1) to 8a (n) connecting the consumers 9 (1) to 9 (n) and the return water side hot water header 8 have flow meters Fh (i) (i = 1 to n), respectively. ) Is installed.

  Further, primary circulation pumps 10a to 10d are interposed in the primary-side outgoing pipes 2a, 2b, 3a, and 4a that connect the respective heat source units and the outgoing-side headers 5 and 7, respectively. Further, secondary side outgoing pipes 5a (1) to 5a (n) and 7a (1) to 7a (n) connecting the outgoing side headers 5 and 7 and the consumers 9 (1) to 9 (n). Are respectively provided with secondary circulation pumps 11 (i) and 12 (i).

  The control system 1D of the chilled / hot water supply system 1 includes a chilled water flow meter Fc (i) and a hot water flow meter Fh (i) disposed in the piping path of the heat source system 1A, header thermometers 13 and 14, and each of these. Based on the measured values of the flow meter and the thermometer, the integrated control device 15 is configured to issue the following operation command to the heat source system 1A side.

<Basic control flow>
The cold / hot water supply system 1 is comprised as mentioned above, Next, with reference to FIG. 2, the aspect of stabilization control of the cold / hot water supply temperature which the integrated control apparatus 15 performs is demonstrated.
During the control, the operation status of the cold water heat source unit 3 and the hot water heat source unit 4 is confirmed (S101). Specifically, it is first determined whether or not any one of the cold water heat source machines 3 is operating (S102).
When the cold water heat source unit 3 is operating (Y in S102), it is further determined whether any one of the hot water heat source units 4 is operating (S103).

When both the heat source units are in operation (Y in S103), even if the outlet temperature of either the cold water or the hot water supplied by the cold / hot water heat source unit 2 becomes appropriate, the cold water heat source unit 3 or the hot water heat source Since it can be complemented by the machine 4, the cold / hot water heat source machine 2 continues the current operation mode (S104).
However, when the stabilization control of the cold / hot water supply temperature is started (first cycle of the operation control flow: Z = 1 (S100)), the user designates the operation mode of the cold / hot water simultaneous supply heat source unit, or The temperature difference between the chilled water header on the water side and the return water side and the calorific value calculated by the chilled water flow meter (building cooling demand), the temperature difference between the hot water header on the outgoing side and the return water side, and the hot water side flow meter Comparing the calculated amount of heat (heating demand for buildings), the one with the larger demand is set as the operation mode of the simultaneous supply source of cold / hot water (for example, when the cooling demand exceeds the heating demand, simultaneous supply of cold / hot water) The heat source machine is operated in the main cooling mode) (S100a, S100b).
In S103, that is, when only the cold water heat source unit 3 is operating, only the cold water heat source unit 3 can be supplemented as a stabilizer, so the cold / hot water heat source unit 2 is in the hot water main mode for satisfying the hot water load. Drive (S105). Details of the cold water temperature stabilization control by the cold water heat source device 3 in this case will be described later.

  In S102, when N, that is, when the cold water heat source unit 3 is in the operation stop state, it is determined whether any one of the hot water heat source units 4 is operating (S106). If it is in operation (Y in S106), only the hot water heat source unit 4 can be complemented as a stabilizer, so the cold / hot water heat source unit 2 operates in the cold water main mode (S108). Details of the hot water temperature stabilization control by the hot water heat source 4 in this case will also be described later.

When N in S106, that is, when both the cold water heat source unit 3 and the hot water heat source unit 4 are in the operation stop state, there is no heat source unit that can be complemented as a stabilizer (S107). Accommodate from the system. Actually, consideration is given at the design stage so that such a situation does not occur.
The operation mode of the cold / hot water heat source machine 2 is updated, and after a predetermined timer set time (t1) has elapsed (Y in S109), the process returns to S101 as Z = Z + 1 (S110), and the above steps are repeated.

<Cooling water temperature stabilization control>
Next, the content of the cold water temperature stabilization control by the cold water heat source unit 3 when the cold / hot water heat source unit 2 is operating in the hot water main mode will be described.
In S105 of FIG. 2, when the cold / hot water heat source device 2 is in the hot water main mode operation, the process proceeds to S201 of FIG. 3, and the integrated control device 15 designates the operating cold water heat source device 3 as a stabilizer (S202). ). Next, r = 1 is set as an initial value of the number of control repetitions (S203). In the following description, it is assumed for convenience that the control is repeated a certain number of times (r = r).

First, it is determined whether or not at least one cold water heat source unit 3 is in operation (S204). If not in operation (N in S204), the process skips to S208.
If it is in operation (Y in S204), the current cold water header temperature (corresponding to the merging portion cold water temperature in the claims) (Tcs (r)) is measured (S205).
Next, the current heat source unit outlet set temperature (CT (r)) is determined according to the flow of FIGS. 4A to 4E described later (S206).

  When the control stabilization timer (t2: 0 to 60 minutes, for example) has elapsed (Y in S207) after CT (r) is determined (Y in S208), update to r = r + 1. (S209), the above control is repeated. If this control is not continued for some reason (N in S208), this control is terminated (S210).

Hereinafter, a specific method for determining the heat source unit outlet set temperature (CT (r)) will be described.
Corresponding to the chilled water header temperature (Tcs (r)) and the chilled water outlet set temperature (CT (r)) of each heat source machine, the chilled water state (Sm (r): m = 1-4) as shown in Table 1. Define. Sm (r) is shown as in FIG.

The contents of symbols used in the table are as follows.
Tt: Tcs target temperature (can be set arbitrarily by the user)
x: Deviation temperature from Tt (0 to 3 ° C: user can arbitrarily set)
y: Deviation temperature from Tt (0 to 3 ° C: user can arbitrarily set)
z: Deviation temperature from Tt (y ~ 3 ℃: user can set any)
CT_j: Outlet set temperature of each stabilizer
CTs_j: Standard outlet set temperature for each stabilizer (j is the number of the stabilizer. In addition, different standard outlet set temperatures may be adopted for each machine)
α: Lowering temperature from CTs_j (0 to 3 ° C: user can arbitrarily set)
β: Lowering temperature from CTs_j (α to 3 ° C: user can arbitrarily set)

  Next, for each stabilized heat source machine (1 to j), corresponding to the previous cold water state (r-1) (Sm (r-1) = S1 to S4), FIGS. ) Determine the outlet set temperature this time according to each flow. For example, referring to FIG. 4A, when the previous cold water state is S1 (Y in S302), the process proceeds to S3010 (FIG. 4B) (S303). Further, referring to FIG. 4B, it is determined whether Tcs ≦ Tt + y (S3011).

If Tcs ≦ Tt + y (Y in S3011), the outlet set temperature (CT (r)) is set to CT_j = CTs_j (S3012). Accordingly, the next cold water state Sm (r) = S1 (S3013).
When Tcs> Tt + y (N in S3011), the outlet set temperature (CT (r)) is set to CT_j = CTs_j−α (S3015). Accordingly, the next cold water state Sm (r) = S3 (S3016).

  Also in the case where the previous cold water state is S2 to S4, the current outlet set temperature is determined according to the flow of FIGS. 4C to 4E as in the case of S1.

Summarizing the above results, the outlet is determined according to the previous cold water condition (Sm (r-1)) and the magnitude relationship between the current cold water header temperature (Tcs (r)) and the deviation temperature from the target temperature (Tt). The set temperature (CT (r)) is shown as Table A in FIG.
By such control, the outlet set temperature and the chilled water header temperature of each stabilizing heat source machine are controlled by the thick line path of FIG. 5 (b) with time, and maintained in the target chilled water temperature range. Will be.
By the above control, the cold water having the expected temperature produced from the cold / hot water simultaneous supply heat source device can be supplemented by other cold water heat source devices, and the cold water supply temperature can be stabilized as a whole system.

<Hot water temperature stabilization control>
Next, the content of the hot water temperature stabilization control by the hot water heat source unit 4 when the cold hot water source device 2 is operating in the cold water main mode will be described.
In S108 of FIG. 2, when the cold / hot water heat source device 2 is in the cold water main mode operation, the process proceeds to S401 of FIG. 6, and the integrated control panel 15 designates the hot water heat source device 4 in operation as a stabilizer (S402). ). Next, r = 1 is set as an initial value of the number of control repetitions (S403). In the following description, it is assumed that the control is repeated a certain number of times (r = r).

First, it is determined whether or not at least one hot water heat source unit 4 is in operation (S404). If not in operation (N in S404), the process skips to S408.
If it is in operation (Y in S404), the current hot water header temperature (corresponding to the merging section hot water temperature in the claims) (Ths (r)) is measured (S405).
Next, the current heat source unit outlet set temperature (HT (r)) is determined according to the flow of FIGS. 7A to 7E described later (S406).

  After HT (r) determination, after the timer for control stabilization (t3: 0 to 60 minutes, for example) has elapsed (Y in S407), if this control is to be continued (Y in S408), update to r = r + 1 (S409), the above control is repeated. If the control is not continued for some reason (N in S408), the control is terminated (S410).

Hereinafter, a specific method for determining the heat source unit outlet set temperature (HT (r)) will be described.
Corresponding to the hot water header temperature (Ths (r)) and the hot water outlet set temperature (HT (r)) of each heat source machine, the hot water state (Sm (r): m = 5-8) as shown in Table 2 Define. Sm (r) is shown as in FIG.

The contents of symbols used in the table are as follows.
Tt ': Ths target temperature (can be set arbitrarily by the user)
x: Deviation temperature from Tt '(0 to 3 ° C: user can arbitrarily set)
y: Deviation temperature from Tt '(0 to 3 ° C: user can set any)
z: Deviation temperature from Tt '(y-3 ° C: user can set any)
HT_k: Outlet set temperature of each stabilizer
HTs_k: Standard outlet set temperature of each stabilizer (k is the number of the stabilizer. In addition, different standard outlet set temperatures may be adopted for each machine)
α: Raised temperature from HTs_k (0 to 3 ° C: user can set any)
β: Raised temperature from HTs_k (α to 3 ° C: user can arbitrarily set)
Note that x, y, z, α, and β may be different from the values used in the cold water temperature stabilization control described above.

  Next, for each stabilized heat source machine (1 to k), corresponding to the previous warm water state (r-1) (Sm (r-1) = S5 to S8), FIGS. ) Determine the current outlet set temperature in accordance with each flow. For example, referring to FIG. 7A, when the previous hot water state is S5 (Y in S502), the process proceeds to S5010 (FIG. 7B) (S503). Further, referring to FIG. 7B, it is determined whether or not Ths ≧ Tt′−y (S5011).

If Ths ≧ Tt′−y (Y in S5011), the outlet set temperature (HT (r)) is set to HT_k = HTs_k (S5012). Accordingly, the next hot water state Sm (r) = S5 (S5013).
If Ths <Tt′−y (N in S5011), the outlet set temperature (HT (r)) is set to HT_k = HTs_k + α (S5015). Accordingly, the next hot water state Sm (r) = S7 (S5016).

When the previous hot water state is S6 to S8, the current outlet set temperature is determined according to the flow of FIGS. 7C to 7E as in the case of S5.
To summarize the above results, according to the previous hot water state (Sm (r-1)) and the magnitude relationship between the current hot water header temperature (Ths (r)) and the deviation temperature from the target temperature (Tt '), The outlet set temperature (HT (r)) is shown as Table B in FIG.

By such control, the outlet set temperature and the warm water header temperature of each stabilization heat source machine are controlled by the thick line path of FIG. 8B with time, and maintained in the target temperature range. It will be.
With the control described above, the hot water having the expected temperature produced from the cold / hot water simultaneous supply heat source device can be supplemented by other hot water heat source devices, and the hot water supply temperature can be stabilized as a whole system.

  The present invention can be widely applied to a cold / hot water supply system using a cold / hot water simultaneous supply heat source machine as a supply source regardless of applications such as district heat supply, commercial / industrial air conditioning / heat supply, and the like.

DESCRIPTION OF SYMBOLS 1 ... Cold / hot water supply system 1A ... Heat source machine system 1B ... Load system 1C ... Supply system 1D ... Control system 2 ... Cold / hot water simultaneous supply heat source Machine 3 ... Cold water heat source machine 4 ... Hot water heat source machine 5 ... Outbound water side cold water header 6 ... Return water side cold water header 7 ... Outbound water side Hot water header 8 ... Return water side hot water header 9 ... Consumers 13, 14 ··· Header thermometer 15 ··· Integrated controller Fc, Fh ··· Flow meter

Claims (4)

Each includes one or more cold / hot water simultaneous supply heat source machines, cold water heat source machines, and hot water heat source machines,
In the cold / hot water supply system that combines the cold water or hot water produced by each heat source machine and distributes and distributes them to the load side,
When at least one of the one or more cold water heat source machines or hot water heat source machines is in operation,
About cold / hot water simultaneous supply heat source machine, while operating to satisfy either load of cold water or hot water,
For the heat source unit during operation (hereinafter referred to as a stabilized heat source unit), it is operated so as to supplement the other load that is lacking.
An operation control method for a cold / hot water supply system. Complementation of the other load is performed by controlling the outlet temperature of the stabilizing heat source unit so as to maintain the temperature of hot water or cold water at the junction in a predetermined supply temperature range,
The operation control method of the cold / hot water supply system according to claim 1. In the case where the stabilization heat source machine is a cold water heat source machine, at a predetermined time interval for each cold water heat source machine,
Previous chilled water state (Sm) determined according to the previous chilled water temperature (Tcs (r-1)) (r: number of repetitions) and the chilled water outlet set temperature (CT (r-1)) of each heat source unit (r-1): m = 1 to 4), and
This time chilled water temperature (Tcs (r))
By repeatedly determining the cold water outlet set temperature (CT (r)) of each heat source machine based on
The operation control method for the cold / hot water supply system according to claim 1, wherein the chilled water temperature range (Tcs) is controlled to a target cold water temperature range. In the case where the stabilization heat source machine is a hot water heat source machine, for each hot water heat source machine at a predetermined time interval,
Previous hot water state (Sm) determined according to the previous junction hot water temperature (Ths (r-1)) (r: number of repetitions) and the hot water outlet set temperature (HT (r-1)) of each heat source unit (r-1): m = 5-8), and
The current hot water temperature at the junction (Ths (r))
By repeatedly determining the hot water outlet set temperature (HT (r)) of each heat source machine based on
3. The operation control method for a cold / hot water supply system according to claim 1, wherein the temperature of the merging section hot water (Ths) is controlled within a target hot water temperature range. 4.

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