JPH0359341B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an air conditioning system having a heat storage tank,
This invention relates to improvements in operation control methods for heat storage heat source devices such as heat pumps.

[Prior art]

Traditionally, this type of operation control method involves performing heat storage operation on heat source equipment during discounted electricity rate hours.
In order to compensate for the lack of heat storage due to heat storage operation at other times, an operation control method has been proposed that performs compensatory operation of heat source equipment (for example,
(See Publication No. 128348).

However, in the conventionally proposed operation control methods, it has not been possible to cut the peak of operating power consumption during compensation operation. Furthermore, during compensation operation, it may not be possible to reliably supply the necessary amount of heat, and on the other hand, there are cases in which extra operation is performed.

[Summary of the invention]

The present invention has the purpose of fundamentally solving such drawbacks of the conventional technology, and includes a heat storage operation mode, a forced stop mode that aims to cut peak power consumption, an all-machine compensation operation mode that compensates for the amount of heat stored by heat storage operation, Then, a number-of-units control compensation operation mode is established to compensate for the amount of heat stored through heat storage operation, and the day is divided into multiple time periods, and the heat storage operation mode is assigned to the discounted power rate time period, thereby reducing peak power consumption. In addition to assigning forced stop mode to the time period,
Forced stop mode, all-machine compensation operation mode, and unit control compensation operation mode shall be selectively assigned to each remaining time period, and the operation of heat source equipment shall be controlled according to the mode for each time period, and during compensation operation. The present invention provides an extremely effective method for controlling the operation of heat source equipment, which can cut the peak power consumption during operation, reliably supply the necessary amount of heat, and avoid redundant operation.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

Figure 1 is an instrumentation diagram, in which a heat pump H/
Pumps P ₁ to P ₃ are provided to supply P ₁ to H/P ₃ ,
The cold water or hot water thus supplied is further cooled by the heat pumps H/P ₁ to H/P ₃ during cooling, heated further during heating, and then discharged into the heat storage tank AT again. By repeating this process for a time corresponding to the required amount of heat storage, the cold water or hot water in the heat storage tank AT reaches a predetermined temperature and heat storage is performed.

In addition, a three-way valve V ₁ is installed on the inlet side of pumps P ₁ to P ₃ .
~V ₃ is provided, heat pump H/P ₁ ~H/P ₃
mixes cold water or hot water from near the discharge ports of the heat pumps H/P ₁ to H/P ₃ to keep the inlet temperature of the heat pumps H/P 1 to H/P 3 almost constant, thereby improving the operating efficiency of the heat pumps H/P ₁ to H/P ₃ . It is becoming.

In addition, temperature sensors T ₁ to _{T 3} are installed in the heat storage tank AT.
is inserted and detects the temperature of the heat storage tank according to the heat storage amount of each part, and the heat pump H/P ₁ ~
Temperature sensors T ₄ to _{T 6} and T ₇ to _{T 9} are provided on the output side and inlet side of H/P ₃ , respectively, and a temperature sensor T ₁₀ for detecting outside temperature is provided. The detection output is given to the control unit CONT, and the control unit CONT controls the heat pumps H/P ₁ to H/P ₃ , pumps P ₁ to P ₃ and three-way valves V ₁ to _{V 3} according to each detection output. It's summery.

That is, heat storage operation is generally performed during the discount electricity rate period at night, and a start signal is sent from the control unit CONT to the heat pumps H/P ₁ to H/P ₃ and pumps P ₁ to _{P 3} based on the clock operation. ,
The heat storage temperature is monitored according to the detection outputs of the temperature sensors _T1 to _T3 , and the heat storage operation is performed so that the temperature falls within the range determined by the predetermined target value and the outside temperature detected by the temperature sensor _T10 . The three-way valves V1 to V3 are controlled according to the detection outputs of temperature sensors _T7 to _T9 , and the above-mentioned mixing situation is varied, while the three-way valves _V1 to _V3 are controlled based on the detection outputs of temperature sensors _T4 to _T6 . The heat storage temperature change in the heat storage tank AT is predicted early, and if the heat storage temperature reaches the point where operation is stopped, a stop signal is sent to the heat pumps H/P ₁ to H/P ₃ and pumps P ₁ to _{P 3} , and the heat storage is stopped. It is supposed to stop the operation.

However, the amount of heat stored by the heat storage tank AT is generally less than the amount of heat required for one day's worth of air conditioning, and in order to compensate for the shortage, compensatory operation is performed even outside of discounted electricity rate hours. In this case as well, the same control as described above is performed.

The cold water or hot water in the heat storage tank AT is supplied by a pump that operates according to the control of a separately installed control device.
P ₄ and P ₅ are supplied to air conditioners AC ₁ to _{AC 3} such as fan coil units via header H, and then returned to the heat storage tank AT via these.
This is something that is repeated.

FIG. 2 is a block diagram of the control unit CONT.
Centered around the processor CPU, fixed memory ROM,
Variable memory RAM, keyboard KB, display DP, and interfaces I/F ₁ and I/F ₂ are arranged around the periphery and connected by a bus bar, and the processor CPU executes instructions stored in the fixed memory ROM. It accepts the detection outputs of each temperature sensor T ₁ to T ₁₀ via interface I/F ₁ and commands from the keyboard KB as data, and accesses the necessary items to the variable memory RAM. Make a judgment and interface I/
It is designed to be sent to each part via _F2 .

In addition, by display DP using a character display etc.
Necessary data is displayed for convenient monitoring and operation.

Figure 3 is a time schedule showing the status of heat storage operation and compensation operation, etc., and shows the heat storage operation mode.
M ₁ , an all-machine compensation operation mode M ₂ in which all heat pumps H/P ₁ to H/P ₃ are operated simultaneously in order to perform statistically predictable compensation, and a sudden change in air conditioning load is compensated for. Therefore, a number control compensation operation mode M ₃ is defined in which only the required number of heat pumps H/P ₁ to H/P ₃ are operated, and a forced stop mode M ₀ is defined for the purpose of cutting peak power consumption. On the other hand, one day is divided into a plurality of time periods HB ₁ to HB ₄ , and for each time period HB ₁ to HB ₄ , each time period HB ₁ to _{HB 4}
Each mode is assigned according to the characteristics of the heat pumps H/P1 to H/P3, and the operation of the heat pumps H/ _P1 to H/ _P3 is controlled accordingly.

That is, in the example shown in Fig. 3, it is possible to enter the heat storage operation mode _M1 only in the time period _HB1 of discounted electricity rates from 10:00 p.m. to 8:00 p.m., and from 1:00 p.m.
In HB ₃ , the peak power consumption time period at 4:00 pm, it is only possible to enter forced stop mode M ₀ , whereas in the remaining time periods HB ₂ and HB ₄ , full machine compensation operation, Any mode can be selected from among the modes M ₂ , M ₃ , and M ₀ of the number-of-units control compensation operation and forced stop.

FIG. 4 is a flowchart of the control status performed by the processor CPU in order to realize the control shown in FIG. After determining the assigned mode, if the forced stop mode "M ₀ ?" becomes Y (YES), the process shifts to "forced stop", but if "M ₀ ?" becomes N (NO), In response to Y of the heat storage operation mode "M ₁ ?", the heat storage operation mode "M ₁ operation" is entered.

Also, depending on N of "M ₁ ?", the total time of each compensation operation mode M ₂ and M ₃ can be statistically predicted in advance by "Driving time limit on the day of M ₂ + M ₃ ?" A determination is made as to whether or not the set time limit will be exceeded, and based on this N, the all-machine compensation operation mode "M ₂ ?" is determined. If this is Y, the same mode is set to "M ₂ operation". But, “M ₂ ?”
When is N, the number of units control compensation operation mode " _M3 operation" is selected according to the outside temperature.

Note that the time limit (M ₂ +M ₃ )max is set for each month depending on the seasonal changes, for example, as shown in FIG.

In addition, as shown in Figure 6, for the heat storage temperature θ of the heat storage tank AT, a target value θ _S is determined for each month depending on the season, and this is used as a reference for the heat pump H/
A starting temperature θ ₁ for forcibly starting the heat pumps P ₁ to H/P ₃ and a stop temperature θ ₂ for forcibly stopping the heat pumps H/P ₁ to H/P ₃ are determined.
As shown in FIG. 8, during heating, the heat storage temperature θ is controlled.

Therefore, in FIG. 4, "Cooling?" is determined regardless of whether "M ₂ + M ₃ operating time limit on the day?" is Y or N. If this is Y, "θ
<θ ₂ ? Performs a “forced stop” in response to “Y”
If “θ<θ ₂ ?” is N and “θ>θ ₁ ?” is Y, “forced start” is performed, while “θ
＞θ ₂ ? Performs a “forced stop” in response to “Y”
If “θ>θ ₂ ?” is N and “θ<θ ₁ ?” is Y, “forced activation” is performed.

Therefore, modes are assigned according to the characteristics of the time periods HB ₁ to _{HB 4} , and the operating status of the heat pumps H/P ₁ to H/P ₃ is controlled according to this mode. , heat storage operation is performed only during the discount electricity rate time period HB1, and
During the time period HB3 when peak cutting is required, a forced stop for the purpose of peak cutting is definitely performed. In addition, in time zones HB2 and HB4,
By selectively assigning forced stop mode, peak operating power consumption can be cut.
By selectively assigning the all-machine compensation operation mode, the required amount of heat can be reliably supplied, and by selectively assigning the number control compensation operation mode, redundant operation can be avoided. As a result, it becomes possible to conclude a contract with the electric power company at a further discount, and the operation is carried out in a rational manner in terms of heat storage, which improves the overall economic efficiency of energy costs.

However, as a heat source device, heat pump H/
In addition to P ₁ to H/P ₃ , boilers, refrigerators, etc. may be used, and the configuration shown in Figure 1 can be selected arbitrarily depending on the conditions, and the control unit CONT can be a combination of various logic circuits. The same effect can be obtained even if a dedicated one is used, and the types of operation modes M ₀ to _{M 3} and the settings of time zones HB ₁ to _{HB 4} can be determined according to the situation, and the flowchart in FIG. Various modifications are possible, such as replacing steps according to conditions or omitting unnecessary steps.

〔Effect of the invention〕

As explained above, according to the present invention, there is a heat storage operation mode, a forced stop mode that aims to cut peak power consumption, an all-machine compensation operation mode that compensates for the amount of heat stored in the heat storage operation, and a thermal storage operation mode that compensates for the amount of heat stored in the heat storage operation. Control the number of units to perform compensation Determine a compensation operation mode, divide the day into multiple time periods, assign heat storage operation mode to discount power rate time periods, and assign forced stop mode to peak power consumption time periods. At the same time, forced stop mode, all-machine compensation operation mode, and number control compensation operation mode are selectively assigned to each remaining time period, and the operation of heat source equipment is controlled according to the mode for each time period. During compensation operation, it is possible to cut peak operating power consumption, ensure the necessary heat supply, and avoid unnecessary operation.As a result, it is possible to conclude a contract with the electric power company at a further discount. , a rational operation is carried out in terms of heat storage, the economic efficiency of energy costs is improved overall, and a remarkable economic effect can be obtained in air conditioning equipment having a heat storage tank.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention, and FIG. 1 is an instrumentation diagram;
Fig. 2 is a block diagram of the control unit, Fig. 3 is a time schedule showing the operating status, Fig. 4 is a flowchart showing the control situation to realize the control shown in Fig. 3, and Fig. 5 is a time limit setting. Diagram showing the situation, No. 6
The figure is a diagram showing the situation in which the target value of the heat storage temperature is determined, and FIGS. 7 and 8 are diagrams showing the control situation of the heat storage temperature. AT... Heat storage tank, H/P ₁ ~ H/P ₃ ... Heat pump (heat source equipment), P ₁ - _{P 5} ... Pump, AC ₁ ~
AC ₃ ...Air conditioner, CONT...Control unit, _T1 to _T10 ...
...Temperature sensor, CPU...Processor, ROM...
Fixed memory, RAM...variable memory, KB...keyboard.

Claims (1)

[Claims] 1. In an operation control method that performs heat storage operation of the heat source equipment during discounted power rate hours, and performs compensatory operation of the heat source equipment during other times to compensate for the lack of heat storage due to the heat storage operation, An operation mode, a forced stop mode for the purpose of cutting peak power consumption, an all-machine compensation operation mode for performing the above compensation, and a number control compensation operation mode for performing the above compensation are determined, and the day is divided into multiple time periods. In addition, the heat storage operation mode is assigned to the discount power rate time period, the forced stop mode is assigned to the peak power consumption time period, and the forced stop mode, all-machine compensation operation mode, and the number of units are assigned to the remaining time periods. A method for controlling the operation of a heat source device, characterized in that a control compensation operation mode is selectively assigned, and the operation of the heat source device is controlled according to the mode for each time period.