JPS6222945A - Heat accumulating operation control method - Google Patents

Abstract

PURPOSE:To prevent a shortage or excess of heat accumulation amount, by determining the total heat amount consumption in accordance with the following day's plan of air conditioning operation, selecting a level of heat accumulating operation to meet such total heat amount consumption, and operating heat source equipment during the night to obtain the heat accumulation amount required by the selected level. CONSTITUTION:For each of load equipment AHU21 disposed separately in respective rooms, shared storage and shared control between the higher-level device CCT 43 and the control device CNT 42, or storage and control only by the CNT 42 is assumed, depending on the usage schedule of the respective rooms in the following day. Since the following day's total consumption of heat amount can be predicted relatively accurately in this manner, and the heat accumulating operation is performed to bring it as close to the prediction as possible, the excess or shortage relative to the following day's actual heat amount load becomes small to allow the economical and reasonable heat accumulating operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of controlling the operating status of a heat source device when a heat source device is provided and heat is stored in a heat storage tank using the heat source device.

[Conventional technology]

In air conditioners, etc., all heat is stored using discount electricity at night, and this is used for air conditioning during the day.
A heat storage tank is installed in which hot water and cold water are stored.When setting the amount of heat storage, the amount of heat storage is determined depending on whether the next day is a weekday or a holiday, and whether the fC is semi-dormant. It is common practice to define

[The problem that the invention aims to solve] However, in the conventional method, the amount of heat stored depends on whether the next day is a weekday, a holiday, or a semi-absent day. Therefore, the setting of the heat storage amount may be inaccurate, and when the air conditioning load is actually operated the next day, there will be an excess or deficiency in the heat storage amount depending on the condition of the air conditioning load. This becomes uneconomical, and in the event of a shortage, the heat source equipment must be operated during the day, which also causes uneconomical problems and noise.

[Means for solving problems]

The aforementioned problem? To solve the problem, the present invention is constituted by the following means.

That is, in the method of performing control 7 described above, the total amount of heat consumption that matches the air conditioning load operation schedule for the next day is determined, the level of heat storage operation is selected according to this total amount of heat consumption, and at this level, the fc and fc heat storage amount are The heat source equipment is to perform nighttime heat storage operation.

Therefore, the total amount of heat consumption for the next day is calculated based on the schedule, and the heat storage operation is performed at a level corresponding to this, so that there will be no excess or deficiency in the amount of heat stored during the night heat storage operation. .

〔Example〕

The present invention will be described in detail below with reference to figures showing examples.

Figure 2 is an instrumentation diagram 9, and the heat storage tank 1 is the partition wall 2a.

2b kW, and each partition wall 2a, 2b Ki each has a gate valve 4 that opens and closes at No. 9 and F4, and cold water 4111a or hot water tank 1b is connected to common tank 1 by opening and closing of n.
For example, during summer cooling, the common tank 1C is in communication with the cold water tank 1a, and during winter heating, the common tank 1C is in communication with the hot water tank 1b. The amount of water in the cold water tank and the hot water tank changes according to the change in the effective installation location of the partition wall.

In addition, in the following description, seven examples will be given in which the common tank 1c is used as a cold water tank.

In addition, heat source equipment such as heat exchange refrigerators (hereinafter referred to as HP) 11
+ ~1in is provided, pump 121~12n
The cold water pumped by HP1h to 11n is cooled and then discharged into the cold water tank 1a via the header 13'i, and the three-way valve 1 is switched according to the opening and closing of the gate valve 4.
4 The water is sucked in from the cold-1e through the header 15 and then reaches the pumps 12s to 12n, where it is circulated through this route.On the other hand, the fL specific hot water pumped through the pumps 161 to 16nK is pumped to HPll, ~11n, is discharged into the hot water tank 1b through the header 17 and a three-way valve 18t which is switched according to the opening and closing of the gate valve 4, and is sucked from the hot water tank 1b through the header 19''k. The water reaches the pumps 16. to 16n, and is circulated throughout this route.As a result, while the water temperature in the cold water tanks 1a and 1c decreases, the water temperature lamp in the hot water tank 1b rises, and heat is stored.

In contrast, load equipment such as air conditioners (hereinafter referred to as AHU)21
are provided at various locations 9, and these include cold water pipes for sucking cold water from the cold water tank 1a into the pump 22 and sending it under pressure.
! r23, the hot water tank 1bl' is connected to the hot water pipe 26 which is sucked into the pump 25 through the three-way valve 24 and then pressure-fed. The cold water and hot water used for heating are connected to the cold return water pipe 29 and fc to the hot return water pipe 30, respectively.
9. In the case of cold water, it passes through the three-way valve 31, directly to the hot water platform, and then the cold water tank 1c is discharged to the hot water mlb, which is circulated through the above route and air-conditioned or heated by AHUZI.

On the other hand, control equipment for air conditioning and heat storage (hereinafter referred to as CNT)
41 A control unit 42 is provided, which is connected to a transmission line 44 by a higher-level device (hereinafter referred to as CCT) 43 such as a central control unit, and performs all the exchange of boot signals between them, as well as transmitting and receiving signals to the CNT 42. is the detected temperature 11"T of the temperature sensors 451 to 45n installed in each part of the heat storage tank 1,
〜Tnzu：Multiple hexagrams、Based on this, cold water tank 1a
, 1c The amount of heat storage corresponding to each distribution temperature of the hot water tank 1b is measured, and the outside air temperature To is measured by the temperature sensor 46.
Measure k, and make control decisions based on these results.

~Iln, pump 12t ~12n, 161~16n
Full control over starting and stopping.

The CNT 41 also has temperature sensors 471 to 474 installed in each of the outgoing water pipes 23.26 and 29.30.
The cold outgoing water temperature Tcy, the hot outgoing water temperature 'rHy, the cold return water temperature TCRN, the hot return water temperature TffR are given, and the fc flowmeters 481 and 481 inserted into each water supply pipe 29 and 30 are given. The cold return water flow rate Fc and the hot return water flow rate FH are given, and using the specific heat Kx+ as 2', the load heat consumed by AHU21 Ed is determined by the following formula: Ed=Fc (TCR-Tcy) Kt ”・
e(1)r Ed=Fll (THF THR) K2
...(2)(1), Result of equation (2) i CNT
42.

In addition, CNT41 and 42 each have a crab timing function,
CNT41 starts and stops pumps 22 and 25 based on a predetermined time schedule, and CNT42 changes the control status of HP11+ to 11n, pumps 121 to 12n, and 16t to 16n. In addition, all control parameters are changed according to commands from the CCT43, and the cold water tank 1a is adjusted according to the season.
, Ic, and changes in the amount of water in the hot water tank 1b.

Figure 3 is a block diagram of the CNTs 41 and 42, centered on a 1a setter (lower, CPU) 51 such as a microprocessor, a variable memory (hereinafter referred to as RAM) 52, a fixed memory (hereinafter referred to as ROM) 53, and a keyboard. (hereinafter referred to as KB)5
4. Display devices such as character display (hereinafter referred to as DP) 55. Clock circuit (hereinafter referred to as CLK) 5 B, L, and interfaces (hereinafter referred to as I/F) 57 to 59 are arranged around all these busbars. The CLK5B is backed up by a battery 60, and the transmission line 44 is connected to the I/F 57, and the detection power D from each sensor etc.
il'' Din is given to the I/F 5B as input data D1.

In this case, the CPU 51 executes the instructions in the ROM 53 and processes the received data via the I/F and 57'.
According to the input data D1 from 58, it performs control calculations and control decisions, and performs timekeeping operations in synchronization with CLK56.When restarting operation after stopping due to power outage, etc., and at regular intervals, the timekeeping contents of CLK56 are updated. It performs all the synchronization state settings with the controller, and also performs control according to the measured time. During these operations, all control operations are performed while accessing the necessary data 2 RAM 52,
The control signal Do+=Don k based on this result is sent as output data Do to each device to be controlled via the I/F 59'.

In addition, the control status is displayed on the DP55, and data can be set and updated in the RAM 52 according to the operation of the KB54, and this status is also displayed on the DP55.
Vcj! l) It is intended to be displayed.

Note that heat storage operation is performed while measuring the amount of heat storage Ef.
It is measured using the following method.

In other words, the temperature distribution in the heat storage tank 1 is not uniform, but has a non-linear gradient. Multiply the weight coefficient Wi? to find the weighted average temperature θ, and then calculate the difference between the air conditioner and fc that can be used for heating, respectively, with the germ l or the lowest limit temperature θe. If the specific heat Ks is k multiplied by !t, the heat storage 1E is calculated.

E= (θ−θe)vaK3 −...
(4) Therefore, I is a number from T1 to Tn, and when calculating the heat storage ik of hot water, it is set as Wik zero, which is multiplied by T by the temperature sensor in 1, and when calculating the total heat storage amount of cold water. is Wi multiplied by T by the temperature sensor in the hot water tank.

Note that if θe is also changed in the same way depending on the season or month, it will be effective in terms of energy conservation.

However, these conditions change depending on the season or month as described above.For example, cold water tank 1a, hot water tank 1a,
The total amount of water in b and common tank 1C is v1 lV2,
When V3 is set, the amount of cold water Vc and hot water fiVuk are determined by the following formula, and Vc=vl (k+1)
"(5)lc" -or O I Vrt=V2 (k+1)
``'' (6) k = -or O Coefficient kk is determined according to the usage status of 1C for the river, and each coefficient of this k process Wi, m etc. is set up for each meeting season or month, and the RAM52 or O is set as a parameter. (3), respectively stored in the ROM 53 and used as a signal indicating the season from the CC'I' 43 or according to the operation of the KB54.
By selecting those to be used in the calculation of equation (4) and calculating Ek using each of these coefficients, it becomes extremely easy to revise the calculation conditions.

The following table shows the operation schedule for each AHU 21i for the next day stored in the RAM of the CNT 42, and the operation start time tON,
The operation stop time topv and the rated air conditioning capacity C per unit time are defined as a table.

In addition, the following example shows a case where the driving start time is earlier than the driving end time.

The amount of heat consumed e for the next day in Table 1 is calculated using the following equation and is then stored as shown in the previous table.

ei :Ci (tOFFi toNi)
@ * * @ (7) Therefore, the total heat consumption iEm for the next day c9 can be calculated using the following equation.

...(8) EmkThe unexpected value of the previous day using equations (1) and (2)Edm-1The predicted value E of the previous day using the equation.

If the predicted value Em is corrected using the following formula and the correction coefficient β, the predicted value Em will be accurate.

△ Em=βI (Edm-I Em-1) + Em
...(9) or △ Em=β2(Edm-1h"rrr-1) Em...
(10) Therefore, in order to cover the entire daytime air conditioning load with the amount of heat stored during the night, the following equation holds true if the target amount of heat storage εe is set equal to Em or Em.

C6= BEm or Em 5eas
(11) Here, assuming that the current amount of heat storage is kE, the operating time t required to make this amount C8 is obtained as follows (12).

Assuming that the time period k Tt , Tz in which night heat storage operation is possible is given, the starting and stopping times of the equipment are determined as shown in the following <1> and <2).

<1> Operation start time: Time T1 End l: Heat storage amount E is ε. Set time or earlier time of Tz <2> Operation start time = (time T2 t) or time T
+ indicates time l end 1f: time T2 In actual driving, is method 1 or 2? shall be selected and used.

FIG. 1 is a flowchart of the control situation by the CPU 51 of the CNT 42.
Is it a fixed time such as :00 o'clock? ``2 (Check 11, and if it is YES, based on Table 1' RAM-+
toN+topp+c" 202, and use these to calculate 'K' according to equation (8).
After performing the m operation '211', each data in the RAM 51 is used to perform the 1 correction operation '212' according to equation (9) or (10).

Next, in step 212, the obtained C8-Em and the current heat storage amount E1 are calculated, and the time TIT of the time zone in which night heat storage operation is possible.
In step 221, the operation start time of the machine 9 is calculated as Tz. Then, in step 231, all checks are made to see if the IJ operation start time has arrived, and if YES, S in step 232 is performed.
``Start the device'' is executed. Next, the end time is calculated in step 241, and in step 242 it is checked whether it is the end time. If YES, the step 243, ``stop one device'' is executed. Based on the next day's vehicle usage schedule, each of the nine AHUs 21 is distributed to each room, etc.
If you store the schedule as shown in Table 1 in the N-work topp, the total heat consumption felt for the next day will be predicted relatively accurately, and the heat storage operation will be performed to approach this value.
The excess or deficiency will be small compared to the actual Ed the next day,
Economical and rational heat storage operation is realized.

9, the table in Table 1 and the control in Figure 1 are shared storage and shared control between CCT43 and CNT42. In addition to electric power, gas, heavy oil, light oil, solar heat, etc., the energy sources to be used can be any combination, and the model of each HP can be determined accordingly.

In the first and second figures, each individual refrigerator, boiler, etc. can be constructed using metal as HP11+ to HP11n, and the heat storage tank 1
vI - The cold water tank 1a and the hot water tank 1b are not shared, but the same result can be achieved even if they are installed separately, so instead of using the CNTs shown in Fig. 3 for CNTs 41 and 42, they are configured in various logic circuits and the following Various modifications are possible, such as having it all around.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the amount of heat storage during nighttime heat storage operation is fixed according to the predicted value of the amount of heat consumption for the next day.
1. Economical and rational heat storage operation can be realized without causing excess or deficiency in the amount of heat storage, and remarkable effects can be obtained in various air conditioners.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a flowchart of the control situation, Fig. 2 is an instrumentation diagram, and Fig. 3 is a block diagram of the CNT. 1... Heat storage tank, 1a... Cold water tank, 1b-...
・Hot water tank, 1c... Common tank, 2a, 2b... Partition wall, 4... Gate valve, 11. ~11n...@HP(
heat source equipment), 21 bites...AHU (load equipment), 41.
42...CNT (control device), 43...CC
T (upper device), 44...transmission line, 451 to 45
n, 46.47 turtle ~ 474... temperature sensor, 48+
, 482...-flow meter, 51-... CPU (processor), 52... RAM (variable memo! J), 5
3...ROM (fixed memory), 56, fist...CI,
K (clock circuit), 57-59...I/F (interface).

Claims (1)

[Claims] In a method of controlling the operating status of heat source equipment for heat storage, a predicted value of total heat consumption according to the air conditioning load operation schedule for the next day is obtained, a level of heat storage operation is selected according to the predicted total heat consumption, and the level of heat storage operation is selected according to the predicted total heat consumption. A heat storage operation control method, comprising causing the heat source device to perform a night heat storage operation in which the amount of heat storage is determined according to a level.