JPS6011046A - Operation control of heat source equipment - Google Patents

Abstract

PURPOSE:To carry out the peak cut of electric power consumption as well as heat accumulation in the time band of discount electric power fee surely to improve heat accumulating efficiency by a method wherein various kinds of operation modes are determined, one day is dividedinto a plurality of time bands and respective modes are allotted to respective time bands to control the operation of the heat source equipment in accordance with the modes of respective time bands. CONSTITUTION:Heat accumulating operation mode M1, all machines compensating operation mode M2 in which all of heat pumps H/P1-H/P3 are operated to carry out statistically anticipatable compensation, and number of set of operating machine control compensating operation mode M2, in which only a necessary number of set among the heat pumps H/P1-H/P3 is operated, are determined in the operation mode of the heat source equipment. Forcibly stopping mode MO, for the purpose of the peak cut of electric power consumption, is determined and one day is divided into a plurality of time bands HB1-HB4 while respective operation modes are allotted to respective time bands HB1-HB4 in accordance with the characters of respective time bands and the operations of the heat pumps H/P1-H/P3 are controlled in accordance with the allotted modes.

Description

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

[Prior art]

Conventionally, in air conditioning equipment that has a heat storage tank, the operation of the heat source equipment is controlled according to the temperature inside the heat storage tank, the temperature of water discharged from the heat source equipment, etc., which tends to cause excess or deficiency in the amount of heat storage.
This results in drawbacks such as peak cutting of operating power consumption and heat storage during the discounted power rate period at night, which cannot reliably save labor.

[Summary of the invention]

The present invention has the purpose of fundamentally solving such drawbacks of the conventional technology, and defines various driving modes, divides the day into a plurality of time periods, and assigns each mode to each time period.
An extremely effective heat source that controls the operation of heat source equipment according to the mode for each time zone, cuts peak power consumption, ensures heat storage during discounted power rate hours, and improves heat storage efficiency. This provides a method for controlling the operation of equipment.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

Figure 1 is an instrumentation diagram.The heat pump H/P uses cold water or hot water in the heat storage tank AT as the heat source equipment.
Heat pump I (/P1
~H/P3), the amount of heat storage that is required is that it is cooled further 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 cold water or hot water in the heat storage tank AT reaches a predetermined temperature, and heat is stored.

In addition, on the inlet side of pumps P1 to P3, there are three-way valves ■5 to v.
3 is provided, and the heat pump )t/P l~)(/P
Cold water or hot water from the vicinity of the discharge ports of heat pumps H/P 1 to VP 3 is mixed to keep the temperature on the inlet side of heat pumps H/P 1 to VP 3 almost constant, thereby improving the operating efficiency of heat pumps H/P 1 to H/P 3. It has become.

In addition, temperature sensors T and -T3 are inserted into the heat storage tank AT to detect the temperature of the heat storage tank according to the amount of heat storage in each part, and also to detect the temperature of the heat storage tank according to the amount of heat stored in each part. On the inlet side, temperature sensors T4 to T6 and T7 to T9 are provided respectively, and a temperature sensor TIO for detecting the outside air temperature is provided.These detection outputs are given to the control unit C0NT, and each detection Control unit C0 according to the output
NT is heat pump H/P1 to H/P3, pump Pi
~P3 and the three-way valve vx-'-V3.

That is, heat storage operation is generally activated during the discount electricity rate period at night, and a start signal is sent from the control unit C0NT to the heat pumps H/P 1 to I/P 3 and pumps P1 to P3 based on the timing operation. temperature sensor T
The heat storage temperature is monitored according to the detection outputs of T1 to T3, and the heat storage operation is controlled so that the temperature falls within the range determined by the predetermined target value and the outside temperature detected by the temperature sensor TIO. The three-way valves Vl to ■3 are controlled according to the detection outputs of the sensors T7 to T9 to vary the above-mentioned mixing situation, while the heat storage temperature change in the heat storage tank AT is quickly controlled based on the detection outputs of the temperature sensors T4 to T6. If the heat storage temperature is predicted to stop operation, the heat pump HIP
A stop signal is sent to H/P 1 to H/P 3 and pump Pi-P3 to stop the heat storage operation.

However, the amount of heat stored by the heat storage tank AT is generally smaller 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 power rate hours. In this case as well, the same control as described above is performed.

Note that the cold water or hot water in the heat storage tank AT is supplied by a pump P 4 + P that is operated under the control of a separately provided control device.
5, the heat is supplied to the air conditioners AC1 to ACa such as fan coil units via the header H, and is then returned to the heat storage tank AT via these, and this process is repeated.

FIG. 2 is a block diagram of the control unit C0NT, with the processor CPU at the center, fixed memory ROM, variable memory RAM, keyboard KB, display DP, and interfaces I/F1 and I/F2 arranged around it. ,
These are connected to the busbar) and the fixed memory ~T, σ
It accepts the detection output of the controller and commands from the keyboard KB as data, accesses the necessary data to the variable memory RAM, makes control decisions based on the power, and sends it to each part via the interface layer 2. It has become.

Incidentally, necessary data is displayed on a display DP using a character display or the like, which is convenient for monitoring and operation.

Figure 3 shows 1. Heat pump H/Pi
~) (Total loss compensation operation mode M2 in which all of the heat pumps H/Pi to H/Ps are operated at the same time, and number control in which only the required number of heat pumps H/Pi to H/Ps are operated in order to compensate for sudden changes in air conditioning load. While a compensation operation mode M3 is defined and a forced stop mode MO is defined for the purpose of cutting peak power consumption, a day is divided into multiple time periods HB1 to HB4. Obi HBI
- HB4, each mode is assigned according to the characteristics of each time zone HBI-HB4, and the operation of the heat pump I(/P1-H/P3 is controlled accordingly).

In other words, in the example of FIG. 3, the time zone HB
It is possible to enter the heat storage operation mode M1 only in I, and it is only possible to enter the forced stop mode MO in the time period HBa from 13:00 to 16:00. For HB2 and HB4, total loss compensation operation and single unit control compensation operation.

FIG. 4 shows that any one of the forced stop modes M2rMa 2Mo can be selected. In order to realize the control shown in FIG.
The flowchart shows the control status performed by the PU. 1. The clock circuit in the processor CPU determines the time zone, the mode assigned according to the contents of the variable memory RAM is determined, and the forced stop mode Mo? ” becomes Y (YES), the process moves to “forced stop”.
If "Mo?" is N (No), the heat storage operation mode "M1?"
According to Y of =l, the mode shifts to heat storage operation mode Ml operation''.

Also, depending on N of "M1?", each compensation operation mode M2. It is determined whether the M30 total time exceeds the time limit set based on statistical predictions in advance, and assuming this is N, total loss compensation operation mode M2? If "M12?" is N, the mode becomes "M2 operation", but if "M12?" is N, the number control compensating operation mode "M3 operation" occurs depending on the outside temperature.

Note that the time limit (M2+Ma)max is, for example, the fifth
As shown in the diagram, it is set for each month according to seasonal changes.

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 according to the season, and heat pumps VP1 to H/P 3 are forced to operate based on this target value θS.・A starting temperature θ1 for starting, and a stopping temperature θ2 for forcibly stopping the heat pumps H/P1 to H/P3.
is determined, and the heat storage temperature θ is controlled as shown in FIG. 7 during cooling and as shown in FIG. 8 during heating.

For this reason, in Figure 4, 'M2+M3's driving time on the day〉limited time? Regardless of Y or H of '°, determine "air conditioning?", and if this is Y, θku θ2? ``Forced stop'' is performed according to Y of ``6θ<θ2?゛° is N and θ〉θ1? ” performs a ``forced startup'' in Y, while ``
cooling? ”, then “θ〉θ2?゛° according to Y of ′°
Forced stop", θ〉θ2?Pa is N and "θ〈θ1
? In case of Y, "forced startup" is performed.

Therefore, the mode is assigned according to the characteristics of the time periods HB1 to HB4, and the operating status of the heat pumps H/P 1-H/P 3 is controlled according to this mode, so there is no discount. Thermal storage operation is carried out only during the electricity rate period, and during the period when peak cuts are required, forced shutdowns are carried out to ensure peak cuts, and this makes it possible to enter into a contract with the Shimi power company at a further discount. As a result, rational operation in terms of heat storage can be carried out at the lowest possible power rate, and the economical efficiency of energy costs is improved overall.

However, as a heat source device, heat pump H/Pi~H
In addition to IP 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 C0NT may be a dedicated one that combines various logic circuits. The same is true even if you use the operation mode MO
~M3 type and time zone HB1~HB4 settings are as follows:
It may be determined according to the situation, and the flowchart shown in FIG. 4 can be modified in various ways, such as replacing steps or omitting unnecessary steps according to conditions.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the heat source equipment is operated according to the operation mode according to the characteristics of the time of day, so that night heat storage and power consumption peak cuts are reliably achieved, and heat storage efficiency is improved. Figure 1 shows an embodiment of the present invention, Figure 1 is an instrumentation diagram, and Figure 2 is a diagram of the control unit. Block diagram, Figure 3 is a time schedule showing the operating status, Figure 4 is a flowchart showing the control status to realize the control in Figure 3, Figure 5 is a diagram showing the setting status of time limits, Figure 6 7 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.

ATΦ...heat storage tank, H/Pl~H/Pa...-heat pump (heat source equipment), P1~P5...φ pump,
ACI-AC3...Air conditioner, C0NT...Controller, Tl-Tl0...Temperature sensor, CPU...
Processor, ROM...Fixed memory, RAM/Excellent
-Variable memory, KB...Keyboard.

Patent applicant Yamatake Honeywell Co., Ltd. Agent: Kazuo Yamakawa (and 1 other person)

Claims (1)

[Claims] Perform heat storage operation of heat source equipment during discounted electricity rate hours,
In the operation control method, the operation control method performs a compensatory operation of the heat source equipment in order to compensate for the shortage of heat storage amount due to the heat storage operation during other time periods, the heat storage operation mode, the forced stop mode for the purpose of peak cutting of power consumption, the A total loss compensation operation mode for performing compensation and a number-of-units control compensation operation mode for performing the above-mentioned compensation are determined, and a day is divided into multiple time periods, and each of the above-mentioned modes is assigned to each time period, and each of the above-mentioned A method for controlling the operation of a heat source device, comprising controlling the operation of the heat source device according to a mode for each time zone.