JPH023100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a heat storage operation control method for a heat source device such as a heat pump used in an air conditioner.

[Prior art]

For heat source devices such as heat pumps, the operating equipment is generally determined based on the capacity of each device depending on the amount of heat required for air conditioning. When storing heat in a heat storage tank, multiple heat source devices are operated continuously at night for a preset period of time depending on the amount of heat required. Due to maintenance, inspection, adjustment, etc., some equipment may become inoperable.
When something became inoperable, backup machines were operated manually, and it was not possible to automatically compensate for the amount of heat.

[Summary of the invention]

The present invention has the purpose of fundamentally eliminating such drawbacks of the conventional technology, and has the purpose of making it possible to operate a plurality of heat source devices continuously at night for a predetermined amount of heat depending on the amount of heat required. If there are heat source devices, find the ratio between the capacity of all heat source devices and the capacity of operable heat source devices, multiply this ratio by the above setting time to obtain the corrected operating time, and operate according to this corrected operating time. The present invention provides an extremely effective method for controlling the operation of heat source equipment, which makes it possible to omit the installation of standby equipment by operating only the heat source equipment that is suitable for use.

〔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 to 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
Mix cold water or hot water from near the discharge ports of the heat pumps H/P ₁ to H/P ₃ to keep the temperature at the inlet side of the heat pumps H/P 1 to H/P 3 almost constant and improve the operating efficiency of the heat pumps H/P ₁ to H/P ₃ . It has become a thing.

In addition, temperature sensors T ₁ to _{T 3} are installed in the heat storage tank AT.
is inserted and detects the heat storage temperature according to the heat storage amount of each part, and the heat pump H/P ₁ to H/
Temperature sensors are installed on the outlet and inlet sides of P ₃ , respectively.
T ₄ to _{T 6} and T ₇ to _{T 9} are provided, while a temperature sensor T ₁₀ for detecting outside air temperature is provided, and these detection forces are given to the control unit CONT, and each detection force is Accordingly, the control unit CONT controls heat pumps H/P ₁ to H/P ₃ , pumps P ₁ to _{P 3} and three-way valve V ₁
~ It is supposed to control V ₃ .

In other words, heat storage operation is performed during the discount electricity rate period at night, and the control unit operates based on the timing operation.
A start signal is sent from CONT to the heat pumps H/P ₁ to H/P ₃ and pumps P ₁ to _{P 3} , and the heat storage temperature is monitored according to the detected power of the temperature sensors T ₁ to _{T 3} . The set target value and
The heat storage operation is controlled to be within the range determined by the outside temperature detected by the temperature sensor _T10 , and the three-way valves _V1 to _V3 are controlled according to the detected forces of the temperature sensors _T7 to _T9 . , while varying the above-mentioned mixing situation, the heat storage temperature change in the heat storage tank AT is predicted at an early stage based on the detection power of the temperature sensors _T4 to _T6 , and if the heat storage temperature reaches a point at which operation is stopped, the heat pump H A stop signal is sent to /P ₁ to H/P ₃ and pumps P ₁ to _{P 3} to stop the heat storage 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. Detection power of each temperature sensor T ₁ to _{T 10} via interface I/F ₁ , and keyboard
It accepts commands from the KB as data, makes control decisions while accessing the variable memory RAM as necessary, and connects the interface I/F ₂ .
The information is sent to each section via the .

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 to compensate for sudden changes in air conditioning load. , a number control compensation operation mode M ₃ in which only the required number of heat pumps H/P ₁ to H/P ₃ are operated is defined, and a forced stop mode M ₀ aimed at cutting peak power consumption is defined. On the other hand, one day is divided into multiple time periods HB ₁ to HB ₄ , and each mode is assigned to each time period HB ₁ to HB ₄ .
According to this, heat pump H/P ₁ ~ H/P ₃
It is designed to control the operation of the

That is, in the example of FIG. 3, the heat storage operation mode M ₁ is activated only during the night time period HB ₁ from 10 p.m. to 8 p.m.
In the time period HB ₃ from 13:00 to 16:00, it is only possible to enter forced stop mode _M0 , while in the time period HB ₂ ,
In HB ₄ , any mode can be selected from modes M ₂ , M ₃ , and M ₀ including all-machine compensation operation, multi-machine control compensation operation, and forced stop.

Figure 4 is a flowchart of the control status performed by the processor CPU in order to realize the control shown in Figure 3.
After determining the proportioned mode according to the content of
If so, it will move to “forced stop”, but “Mo?”
In case of N (NO), Y in heat storage operation mode “M ₁ ?”
Depending on the situation, the heat storage operation mode “ _M1 operation” will be activated.

In addition, 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 for M ₂ + M ₃ on the day?" A determination is made as to whether or not the set time limit is exceeded. If the time is less than the control time, the all-machine compensation operation mode “M ₂ ?” is determined, and this is
If so, the same mode will be “M ₂ operation”,
When “M ₂ ?” is N, the number of units control compensation operation mode “M ₃ operation” is established 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 θs 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.
During heating, as shown in Figure 8, 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 startup” 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.

Figure 9 shows that during night heat storage operation in heat storage operation mode M1, if any of the heat pumps H/P ₁ to H/P ₃ is inoperable, the operation time is corrected and only those that are operable are selected. This is a flowchart of a situation in which a corrected driving time is calculated for driving. In other words, this flowchart is representative of the present invention, and shows the set time t for continuous operation of all heat pumps according to the amount of heat required, and the corrected operation time t for operating all the heat pumps that can be operated. t _c and a predetermined ratio is α, the corrected operating time t _c is finally determined by the following equation.

t _c = α・t...(1) If the total number of heat pumps is n, each heat pump number is j, the number of inoperable heat pumps is i, and the capacity of each heat pump is L, then the ratio α is is expressed by the following equation.

In other words, the numerator on the right side of equation (2) is the total capacity of all heat pumps, the denominator is the total capacity of all heat pumps that can be operated, and by multiplying the ratio α of both by the time t, it is possible to operate only the heat pumps that are operable. The corrected operating time until the required amount of heat is accumulated.
t _c can be found.

Therefore, in FIG.
Enter the heat pump number “j” to the counter in the CPU.
= 1", then check the contents of the variable memory RAM given by the keyboard KB or external failure input via the route omitted in the diagram, and check "Is NO.j inoperable? ”, and then store the device NO.j at this time in RAM according to Y of this.
Then, “j=j+1” until “j=n?” becomes Y.
Repeat the steps from ``Is NO.j inoperable?'' and registering the counter by ``Is NO. After calculating α, t _c is calculated based on this α using equation (1).

This calculation result is stored in variable memory RAM,
The processor CPU performs control according to the stored corrected operation time t _c and only operates the heat pumps that can be operated, and the corrected operation time t _c
As time progresses, the required amount of heat is accumulated.

Therefore, when multiple heat pumps are operated continuously at night for a preset period of time depending on the amount of heat required, even if there is an inoperable heat pump, the purpose can be achieved by extending the set operation time. Become something.

In addition, various operating modes are set and the modes are assigned according to the time of day, so that rational operation in terms of heat storage can be achieved at the lowest possible electricity rate, and the heat source equipment can be operated economically.

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 according to the conditions, and the control unit CONT can be configured by combining various logic circuits. The same applies even if a dedicated one is used, and the type and time of operation mode M ₀ to M ₃
The settings for HB ₁ to _{HB 4} can be determined according to the situation, and each flowchart can be modified in various ways, such as replacing steps or omitting unnecessary steps depending on the conditions. It is.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the need to provide a standby unit in the heat source equipment is eliminated, and equipment costs can be easily reduced, so that remarkable effects 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 shows the situation in which the target value of the heat storage temperature is determined, FIGS. 7 and 8 show the situation in which the heat storage temperature is controlled, and FIG. 9 is a flow chart of the situation in which the corrected operation time is calculated. 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 a heat storage operation control method for a heat source device in which multiple heat source devices are operated continuously at night for a preset period of time depending on the amount of heat required, if there is an inoperable heat source device, all heat source devices are Find the ratio between the capacity and the capacity of the operable heat source equipment,
A heat storage operation control method for heat source equipment, characterized in that the corrected operating time is obtained by multiplying the set time by this ratio, and only the operable heat source equipment is operated according to the corrected operating time.