JPH07133944A - Control of heat source device in ice storage type heat source apparatus - Google Patents
Control of heat source device in ice storage type heat source apparatusInfo
- Publication number
- JPH07133944A JPH07133944A JP27928393A JP27928393A JPH07133944A JP H07133944 A JPH07133944 A JP H07133944A JP 27928393 A JP27928393 A JP 27928393A JP 27928393 A JP27928393 A JP 27928393A JP H07133944 A JPH07133944 A JP H07133944A
- Authority
- JP
- Japan
- Prior art keywords
- heat source
- source device
- heat
- cold water
- brine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Other Air-Conditioning Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、氷蓄熱式熱源装置の自
動運転制御に係わり、特に、冷水ポンプを変流量制御
（負荷の状態により冷水の流量を変化させる方式）する
システムにおいて夜間電力により蓄えた蓄熱を日中の空
調に出来る限り有効利用するために最適な氷蓄熱式熱源
装置の熱源機器制御方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to automatic operation control of an ice heat storage type heat source device, and particularly to a system for controlling a variable flow rate of a chilled water pump (a system of varying a chilled water flow rate depending on a load state) by using nighttime electric power. The present invention relates to a heat source device control method of an ice heat storage type heat source device, which is most suitable for effectively utilizing the stored heat for daytime air conditioning.
【０００２】[0002]
【従来の技術】従来の氷蓄熱式熱源装置の熱源機器の制
御方式は （１）空気調和衛生工学 第６４巻 第７号に記載のよ
うに水位により蓄熱量を逐次監視し時刻と蓄熱量とから
熱源機器の発停を制御する方式 （２）機研159000671 に記載のように冷水の戻り温度の
みにより熱源機器の発停を制御する方式 が有るが、（１）の蓄熱量監視による方式は冷水ポンプ
の変流量制御に対しては問題がないが、制御が複雑でマ
イコンにかかる負担が大きい、水位の変動等の外乱によ
り誤動作する。2. Description of the Related Art A conventional control method for a heat source device of an ice heat storage type heat source device is as follows: (1) Air Conditioning Sanitary Engineering Volume 64, No. 7 There is a method to control the start and stop of the heat source equipment only by the return temperature of the cold water as described in Kiken 159000671, but the method by the heat storage amount monitoring of (1) is There is no problem with variable flow control of the chilled water pump, but the control is complicated, the load on the microcomputer is large, and malfunctions occur due to disturbances such as fluctuations in water level.
【０００３】（２）の冷水戻り温度のみによる方式は制
御は簡単であり、水位の外乱に対して誤動作の心配は無
いが冷水ポンプの変流量制御を行うと制御不能になる等
それぞれに長所，短所を持っており、必ずしも氷蓄熱式
熱源装置の熱源機器の制御方式として理想的な物ではな
かった。The method (2) based only on the cold water return temperature is easy to control, and there is no risk of malfunction due to disturbance of the water level, but if the variable flow rate control of the cold water pump is performed, it will be uncontrollable. Due to its shortcomings, it was not always the ideal control method for the heat source equipment of the ice heat storage type heat source device.
【０００４】[0004]
【発明が解決しようとする課題】上記従来技術では、冷
水ポンプの変流量制御，水位変動等の外乱，制御の簡便
さについての考慮がなされておらず、信頼性，使いやす
さ，種々のシステムへの適用性に問題が有った。The above-mentioned prior art does not take into consideration the variable flow rate control of the chilled water pump, the disturbance such as the water level fluctuation, and the simplicity of the control, so that the reliability, the ease of use, and various systems can be improved. There was a problem in applicability to.
【０００５】本発明の目的は、従来のように冷水の戻り
温度のみで熱源機器の発停を制御するのではなく、冷水
の戻り温度に加えて冷水の循環流量を検出しこれによっ
て制御の簡便性，水位の外乱に対する信頼性，冷水変流
量制御に適応可能な熱源機器の発停制御方式を提案する
事にある。The object of the present invention is not to control the start / stop of the heat source device only by the return temperature of the cold water as in the prior art, but to detect the circulation flow rate of the cold water in addition to the return temperature of the cold water and thereby simplify the control. The aim is to propose a heat source device start / stop control method that can be applied to the heat source, reliability of water level disturbance, and cold water variable flow rate control.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記の問題点
を解決するため、熱源機器の発停を制御する為の冷水戻
り（負荷からの）温度，冷水循環流量を設定する手段と
冷水の負荷からの戻り温度、および冷水の循環流量を検
出する手段を設け、これによって冷水ポンプの変流量制
御にも対応できるようにする。In order to solve the above problems, the present invention provides a means for setting a cold water return (from load) temperature and a cold water circulation flow rate for controlling the start / stop of a heat source device, and a cold water. A means for detecting the return temperature from the load and the circulating flow rate of the cold water is provided, thereby making it possible to cope with the variable flow rate control of the cold water pump.
【０００７】[0007]
【作用】冷水ポンプの変流量制御を行わないシステムに
おいて、冷水の戻り温度（負荷からの）は負荷の状態に
応じて変化する。即ち、負荷が大きくなれば冷水の戻り
温度は高く、逆に負荷が小さくなれば冷水の戻り温度は
低くなる。従って、冷水ポンプを変流量制御しない場合
は冷水の戻り温度を検出して熱源機器の発停を制御する
事が可能である（冷水の戻り温度が高い場合は熱源機器
を運転する、逆に冷水の戻り温度が低い場合は熱源機器
を停止する。これにより、負荷の大きい時は熱源機器を
運転し、負荷の少ないときは熱源機器を停止するように
制御が出来る）。In the system in which the variable flow rate control of the chilled water pump is not performed, the chilled water return temperature (from the load) changes according to the load condition. That is, when the load is large, the return temperature of the cold water is high, and conversely, when the load is small, the return temperature of the cold water is low. Therefore, it is possible to detect the return temperature of the cold water and control the start and stop of the heat source device when the cold water pump does not control the variable flow rate (when the return temperature of the cold water is high, the heat source device is operated. When the return temperature of is low, the heat source equipment is stopped.This allows the heat source equipment to be operated when the load is heavy and to be stopped when the load is light).
【０００８】しかし、変流量制御を行うシステムにおい
ては負荷の大きい時は全量の冷水を循環させるが、負荷
の少ない時は冷水の循環量を減らすため冷水の戻り温度
は常にほぼ一定の温度で戻ってくる。However, in a variable flow rate control system, when the load is large, the entire amount of cold water is circulated, but when the load is small, the circulating amount of cold water is reduced so that the return temperature of the cold water always returns at a substantially constant temperature. Come on.
【０００９】したがって、冷水ポンプを変流量制御して
いるシステムでは冷水の戻り温度で熱源機器の発停を制
御する事は不可能である。Therefore, it is impossible to control the start / stop of the heat source device by the return temperature of the cold water in the system in which the cold water pump controls the variable flow rate.
【００１０】上記の問題を解決するため、冷水の戻り温
度を検出する事に加えて冷水の循環流量を検出し冷水の
戻り温度が設定値に達しており、しかも冷水の循環流量
が設定値に達している時に熱源機器の運転を行うように
制御する。この方法によれば冷水ポンプを変流量制御し
た場合にも簡便な方法で制御が行えると共に水位変動等
の外乱にも強く、しかも冷水ポンプの変流量制御にも対
応可能である。In order to solve the above problems, in addition to detecting the return temperature of cold water, the circulating flow rate of cold water is detected and the returning temperature of cold water reaches a set value, and the circulating flow rate of cold water reaches the set value. When it reaches, the heat source equipment is controlled to operate. According to this method, even when the chilled water pump is subjected to variable flow rate control, control can be performed by a simple method, and it is resistant to disturbances such as water level fluctuations, and moreover, it is also possible to cope with variable flow rate control of the chilled water pump.
【００１１】[0011]
【実施例】以下、本発明の一実施例を図１により説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
【００１２】図１は、氷蓄熱式熱源装置の基本フローで
あり、１は熱源機器、２は空調運転時に熱源機器１で冷
却された不凍液と負荷から戻ってきた冷水との熱交換を
行うブライン／水熱交換器、３は夜間電力を利用して発
生した熱を蓄える蓄熱槽、４は夜間電力を利用して熱源
機器１を運転し発生した低温のブラインと蓄熱槽内の水
とを熱交換させ、蓄熱槽内に氷を作る製氷熱交換器、５
は負荷からの冷水を導く冷水配管、６はブライン／水熱
交換器を出た冷水を蓄熱槽内で散水する散水配管、７は
冷水出口温度を制御するため蓄熱槽に流入する冷水量を
制御する制御弁、９は冷水出口温度を検出する温度検出
器、１０は温度検出器９の信号に基づき制御弁７に開閉
信号を出す温調計、１１は熱源機器１とブライン／水熱
交換器２及び製氷熱交換器４とを結ぶブライン配管であ
る、１２，１３は空調運転時と蓄熱運転時でブラインの
流れ方向を切り替える切り替え弁、１６は蓄熱運転時の
蓄熱量を推定するために水位を検出する水位検出器、１
７は水位検出器１６に水位を導く導管、１８は温度検出
器、２９は冷水ポンプである。FIG. 1 is a basic flow of the ice heat storage type heat source device, wherein 1 is a heat source device, 2 is a brine for exchanging heat between the antifreeze liquid cooled by the heat source device 1 and the cold water returned from the load during the air conditioning operation. / Water heat exchanger, 3 is a heat storage tank for storing heat generated by using night power, and 4 is heat of low temperature brine generated by operating the heat source device 1 by using night power and water in the heat storage tank An ice making heat exchanger that is exchanged to make ice in the heat storage tank, 5
Is a cold water pipe for guiding cold water from the load, 6 is a sprinkling pipe for sprinkling the cold water from the brine / water heat exchanger in the heat storage tank, and 7 is the amount of cold water flowing into the heat storage tank for controlling the cold water outlet temperature Control valve, 9 is a temperature detector that detects the outlet temperature of cold water, 10 is a temperature controller that outputs an open / close signal to the control valve 7 based on the signal of the temperature detector 9, 11 is the heat source device 1 and brine / water heat exchanger Brine pipes that connect 2 and the ice making heat exchanger 4, 12 and 13 are switching valves that switch the flow direction of brine between air conditioning operation and heat storage operation, and 16 is a water level for estimating the heat storage amount during heat storage operation. Water level detector for detecting 1
7 is a conduit for guiding the water level to the water level detector 16, 18 is a temperature detector, and 29 is a cold water pump.
【００１３】また、１９，２０，２１は本発明の核心で
あり、１９は制御盤、２０は氷蓄熱式熱源装置の冷水入
口温度（冷水戻り温度）検出器、２１は冷水循環流量を
測定するための差圧式流量検出器である。Reference numerals 19, 20, and 21 are the core of the present invention. 19 is a control panel, 20 is a cold water inlet temperature (cool water return temperature) detector of the ice storage heat source device, and 21 is a cold water circulation flow rate. It is a differential pressure type flow rate detector for.
【００１４】まず、氷蓄熱式熱源装置の一般的な動作に
ついて説明する。First, a general operation of the ice heat storage type heat source device will be described.
【００１５】氷蓄熱式熱源装置には、夜間の蓄熱運転と
日中の空調運転とがある。夜間の蓄熱運転は、熱源機器
１（冷凍機）を運転し、配管１１内のブラインを、０℃
以下に冷却し、蓄熱槽３内の製氷熱交換器４により、蓄
熱槽３内の水を氷に相変化させる事によって蓄熱を行
う。The ice storage type heat source device includes a heat storage operation at night and an air conditioning operation during the day. In the heat storage operation at night, the heat source device 1 (refrigerator) is operated and the brine in the pipe 11 is kept at 0 ° C.
Cooling is carried out below, and heat is stored by changing the phase of the water in the heat storage tank 3 into ice by the ice making heat exchanger 4 in the heat storage tank 3.
【００１６】通常、上記のような蓄熱運転は夜間割引時
間帯（２２：００〜８：００）に行う。Usually, the heat storage operation as described above is performed during the nighttime discount period (22:00 to 8:00).
【００１７】なお、熱源機器１の小型化を計るため、夜
間割引時間帯以外にも蓄熱運転を行う方法もある。To reduce the size of the heat source device 1, there is a method of performing heat storage operation other than the night discount time period.
【００１８】また、蓄熱量は、水位検出器１６により、
基準位置（蓄熱量零の位置）からの水位差を常時測定
し、水位差が所定の値になったとき蓄熱が完了したと判
断し、蓄熱運転を終了する。The amount of heat stored is determined by the water level detector 16.
The water level difference from the reference position (the position where the heat storage amount is zero) is constantly measured, and when the water level difference reaches a predetermined value, it is determined that the heat storage is completed, and the heat storage operation is ended.
【００１９】次に、日中の冷房運転は、熱源機器１（冷
凍機）を運転して、ブラインを３℃程度に冷却し、配管
６を通してブライン／水熱交換機２に導き、ここで、負
荷から戻って来た冷水と熱交換を行うことによって、冷
水の温度を下げる。Next, during the daytime cooling operation, the heat source device 1 (refrigerator) is operated to cool the brine to about 3 ° C., and the brine is guided to the brine / water heat exchanger 2 through the pipe 6, where the load is applied. The temperature of the cold water is lowered by exchanging heat with the cold water returning from.
【００２０】さらに、ブライン／水熱交換器２を出てき
た冷水を、ユニットの出口において所定の温度（例えば
７℃）とするように、制御弁７を温度検出器９および、
温度調節計１０で制御する。Further, the control valve 7 is provided with a temperature detector 9 and a temperature detector 9 so that the cold water coming out of the brine / water heat exchanger 2 is brought to a predetermined temperature (for example, 7 ° C.) at the outlet of the unit.
It is controlled by the temperature controller 10.
【００２１】次に、本発明の核心である空調運転時の熱
源機器１の制御方式について、図１および図２を用いて
従来の方式との比較で説明する。Next, the control method of the heat source device 1 during the air conditioning operation, which is the core of the present invention, will be described with reference to FIGS. 1 and 2 in comparison with the conventional method.
【００２２】従来の空調運転時熱源機器１の制御方式は
負荷から冷水戻り温度２０を検出し、冷水戻り温度２０
が設定値よりも高いか低いかで熱源機器１の発停を制御
していた（設定値よりも高ければ負荷が大きいと判断し
熱源機器１を運転し、設定値よりも低ければ負荷が小さ
いと判断し熱源機器１の運転を停止する。）上記の方法
は冷水の循環流量が変化しない定流量の場合（変流量制
御をしない場合）には負荷に見合った正しい制御が行え
るが、負荷の状態により冷水の循環流量が変化するシス
テムにおいては負荷の状態に関わらず冷水の戻り温度が
一定となるため負荷に見あった正しい制御を行う事は不
可能である。In the conventional control method of the heat source device 1 during air conditioning operation, the cold water return temperature 20 is detected from the load, and the cold water return temperature 20 is detected.
Was controlled to be higher or lower than the set value by controlling the start / stop of the heat source device 1 (if it is higher than the set value, it is judged that the load is large and the heat source device 1 is operated, and if it is lower than the set value, the load is small. Therefore, the operation of the heat source device 1 is stopped.) In the above method, when the circulating flow rate of the cold water is a constant flow rate (when the variable flow rate control is not performed), the correct control corresponding to the load can be performed. In a system in which the circulating flow rate of cold water changes depending on the state, the return temperature of the cold water is constant regardless of the load state, so it is impossible to perform correct control according to the load.
【００２３】そこで、冷水の戻り温度２０に加えて冷水
の循環流量２１を検出し予め制御盤１９内に設定してお
いた冷水戻り温度および冷水循環流量の設定値との比較
で熱源機器１の発停を制御する（冷水戻り温度２０，冷
水循環流量２１それぞれが設定値以上になったとき熱源
機器１を運転し、設定値以下の時停止するように制御す
る。）。Therefore, in addition to the return temperature 20 of the cold water, the circulation flow rate 21 of the cold water is detected and compared with the preset values of the return temperature of the cold water and the circulation flow rate of the cold water which are set in advance in the control panel 19, and the heat source device 1 is compared. Start / stop is controlled (when the chilled water return temperature 20 and the chilled water circulation flow rate 21 each exceed the set value, the heat source device 1 is operated, and when the chilled water return temperature 20 and the chilled water circulation flow rate 21 are below the set value, the heat source device 1 is stopped.
【００２４】本方式によれば、冷水循環流量２１が変化
しない定流量のシステムはもちろんのこと冷水循環流量
２１が負荷によって変化する変流量方式のシステムにお
いても負荷に見合った熱源機器１の制御が可能である。According to this method, the control of the heat source device 1 corresponding to the load can be performed not only in the constant flow rate system in which the cold water circulation flow rate 21 does not change but also in the variable flow rate system in which the cold water circulation flow rate 21 changes depending on the load. It is possible.
【００２５】流量検知２１の方法はブライン水熱交換器
の出入口の差圧による方法のほか、ブライン水熱交換器
の冷水入口，出口、あるいはユニットからの冷水出口に
流量計を設置する事によっても実現可能である（流量計
の取付位置については冷水配管系で配管系内の冷水循環
量が測定可能な場所なら何処でも良い）。The method for detecting the flow rate 21 is not limited to the method using the differential pressure at the inlet / outlet of the brine water heat exchanger, but can also be set by installing a flow meter at the cold water inlet / outlet of the brine water heat exchanger or the cold water outlet from the unit. It is feasible (the flowmeter can be installed anywhere in the cold water piping system as long as it can measure the circulating amount of cold water in the piping system).
【００２６】温度検知の方法は冷水の戻り（ブライン水
熱交換器の冷水入口）の温度検出による他、ブライン水
熱交換器の出口の水温によって行う事も可能である。The temperature can be detected by detecting the temperature of the return of cold water (the cold water inlet of the brine water heat exchanger), or by the water temperature at the outlet of the brine water heat exchanger.
【００２７】本発明の運転制御方式は予め制御盤内で冷
水戻り温度，冷水循環流量を設定しておく方法の他、マ
イコン等を利用し負荷の状態によって自動的に設定値を
変更するよう制御することも可能である（たとえば７
月，８月の高負荷のシーズンは設定温度，流量の設定値
を低めにし熱源機器１の運転が入りやすい状態にする。
これにより日中の能力不足を防ぐ。また、４月ないし６
月あるいは９月，１０月のように比較的負荷の少ないシ
ーズンは設定値を高めに設定し熱源機器１の運転が入り
にくい状態にする。これにより蓄熱を残さないような運
転が可能である。The operation control system of the present invention is a method of setting the cold water return temperature and the cold water circulation flow rate in the control panel in advance, and also controlling to automatically change the set values according to the load condition by using a microcomputer or the like. It is also possible (eg 7
During the high load seasons of the month and August, the set values of the set temperature and the flow rate are set to be low so that the heat source device 1 can be easily operated.
This will prevent a lack of ability during the day. Also, April to 6
In a season with a relatively small load such as the month or September and October, the set value is set to a high value to make it difficult for the heat source device 1 to operate. As a result, it is possible to perform an operation in which heat is not stored.
【００２８】上記の熱源機器の制御方法は氷蓄熱に関わ
らず、負荷の状態で熱源機器の発停を制御する他の媒体
を蓄熱材とする蓄熱式熱源装置、または、蓄熱材を持た
ない熱源機器を負荷の状態に合わせて制御する場合にも
有効である。In the control method of the heat source device described above, a heat storage type heat source device using another medium for controlling the start and stop of the heat source device under load condition as a heat storage material or a heat source having no heat storage material irrespective of ice heat storage. It is also effective when controlling equipment according to the load condition.
【００２９】[0029]
【発明の効果】本発明によれば、水位変動による外乱に
強く、冷水の変流量制御にも対応可能な空調運転の熱源
機器の発停制御が実現できる。According to the present invention, it is possible to realize start / stop control of a heat source device for air conditioning operation, which is resistant to disturbance due to fluctuations in water level and is compatible with control of variable flow rate of cold water.
【図１】氷蓄熱空調システムの一実施例の系統図。FIG. 1 is a system diagram of an embodiment of an ice heat storage air conditioning system.
【図２】従来の熱源機器の制御方式のフローチャート。FIG. 2 is a flowchart of a control method for a conventional heat source device.
【図３】本発明の熱源機器の制御方式のフローチャー
ト。FIG. 3 is a flowchart of a heat source device control method according to the present invention.
１…熱源機器、２…ブライン／熱交換器、３…蓄熱槽、
４…製氷熱交換器、５…冷水配管、６…散水配管、７，
９…温度検出器、１０…温度調節器、１１…ブライン配
管、１２，１３…ブライン切り替え制御弁、１６…水位
検出器、１７…水位検出器導圧管、１８…蓄熱槽温度検
出器、１９…本体制御盤、２０…冷水入口温度検出器、
２１…冷水循環流量検出器、２９…冷水ポンプ。1 ... Heat source device, 2 ... Brine / heat exchanger, 3 ... Heat storage tank,
4 ... Ice heat exchanger, 5 ... Cold water piping, 6 ... Sprinkling piping, 7,
9 ... Temperature detector, 10 ... Temperature controller, 11 ... Brine piping, 12, 13 ... Brine switching control valve, 16 ... Water level detector, 17 ... Water level detector pressure guiding pipe, 18 ... Heat storage tank temperature detector, 19 ... Main body control panel, 20 ... Cold water inlet temperature detector,
21 ... Cold water circulation flow rate detector, 29 ... Cold water pump.
Claims (1)
槽と、これらを制御する手段とを備え、相変化による高
密度蓄熱，蓄冷を夜間電力を利用して行い、この熱を昼
間の空気調和等に利用する氷蓄熱式熱源装置において、
冷水戻り温度の設定，冷水流量の設定を行う設定手段
と、負荷からの冷水戻り温度の検出，冷水の循環流量の
検出を行う検出手段とを設け、冷水の負荷からの戻り温
度と冷水循環量により熱源機器の発停を制御する事を特
徴とする氷蓄熱式熱源装置の熱源機器制御方式。1. A heat source device, a heat storage tank connected to the heat source device, and a means for controlling these, and high-density heat storage and cold storage by phase change are performed by using nighttime electric power, and this heat is generated during the daytime. In the ice storage heat source device used for air conditioning,
The setting means for setting the cold water return temperature and the cold water flow rate, and the detecting means for detecting the cold water return temperature from the load and the circulating flow rate of the cold water are provided, and the returning temperature from the load of the cold water and the cold water circulation amount are provided. A heat source device control method for an ice storage type heat source device, characterized in that the start and stop of the heat source device is controlled by the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27928393A JPH07133944A (en) | 1993-11-09 | 1993-11-09 | Control of heat source device in ice storage type heat source apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27928393A JPH07133944A (en) | 1993-11-09 | 1993-11-09 | Control of heat source device in ice storage type heat source apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07133944A true JPH07133944A (en) | 1995-05-23 |
Family
ID=17609014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27928393A Pending JPH07133944A (en) | 1993-11-09 | 1993-11-09 | Control of heat source device in ice storage type heat source apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07133944A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016142491A (en) * | 2015-02-04 | 2016-08-08 | 株式会社日立製作所 | Operation management device of heat source system, operation management method of heat source system and computer program |
| WO2023011053A1 (en) * | 2021-07-31 | 2023-02-09 | 华为技术有限公司 | Temperature control method and related device |
-
1993
- 1993-11-09 JP JP27928393A patent/JPH07133944A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016142491A (en) * | 2015-02-04 | 2016-08-08 | 株式会社日立製作所 | Operation management device of heat source system, operation management method of heat source system and computer program |
| WO2016125583A1 (en) * | 2015-02-04 | 2016-08-11 | 株式会社日立製作所 | Heat source system operation management device, heat source system operation management method, and computer program |
| WO2023011053A1 (en) * | 2021-07-31 | 2023-02-09 | 华为技术有限公司 | Temperature control method and related device |
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