CN100443814C - Adjustment method of regional central cooling cooling capacity adjustment system - Google Patents

Adjustment method of regional central cooling cooling capacity adjustment system Download PDF

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CN100443814C
CN100443814C CNB2006100368682A CN200610036868A CN100443814C CN 100443814 C CN100443814 C CN 100443814C CN B2006100368682 A CNB2006100368682 A CN B2006100368682A CN 200610036868 A CN200610036868 A CN 200610036868A CN 100443814 C CN100443814 C CN 100443814C
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cooling capacity
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temperature
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闫军威
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Guangzhou I Mec Intelligent Technology Co ltd
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GUANGZHOU YUANZHENG INTELLIGENCE TECHNOLOGY Co Ltd
South China University of Technology SCUT
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Abstract

本发明提供区域集中供冷冷量调节系统,包括冷冻站服务器、冷冻站控制器、二级冷量交换站控制器、末端控制器、远程监控计算机、本地监控计算机,冷冻站服务器通过转换器与冷冻站控制器及二级冷量交换站控制器连接,多个远程监控计算机通过转换器与冷冻站控制器及多个二级冷量交换站控制器连接,每个二级冷量交换站控制器通过工业控制网络与本地监控计算机及多个末端控制器分别连接;其采用区域集中供冷三级逆向调节,即中央空调末端空调设备冷量调节、区域集中供冷二级冷量交换站冷量调节、区域集中供冷管网供水温度调节。本发明可提高供冷管网供回水温差,降低供冷水泵功耗,大幅提高供冷管网供水温度及制冷主机运行效率,减少供冷管道冷量损失。

Figure 200610036868

The invention provides a regional centralized cooling cooling capacity adjustment system, which includes a freezing station server, a freezing station controller, a secondary cooling exchange station controller, a terminal controller, a remote monitoring computer, and a local monitoring computer. The freezing station server communicates with the The controller of the freezing station is connected to the controller of the secondary cooling capacity exchange station. Multiple remote monitoring computers are connected to the controller of the freezing station and multiple secondary cooling capacity exchange station controllers through converters. Each secondary cooling capacity exchange station controls The controller is connected to the local monitoring computer and multiple terminal controllers respectively through the industrial control network; it adopts three-level reverse adjustment of regional centralized cooling, that is, the cooling capacity adjustment of the central air-conditioning terminal air-conditioning equipment, and the cooling of the secondary cooling capacity exchange station of the regional centralized cooling. Volume adjustment, regional centralized cooling pipe network water supply temperature adjustment. The invention can increase the temperature difference between the supply and return water of the cooling pipe network, reduce the power consumption of the cooling water pump, greatly improve the water supply temperature of the cooling pipe network and the operating efficiency of the refrigeration host, and reduce the loss of cooling capacity of the cooling pipe.

Figure 200610036868

Description

区域集中供冷冷量调节系统的调节方法 Adjustment method of regional central cooling cooling capacity adjustment system

技术领域 technical field

本发明涉及中央空调节能控制技术,具体是指区域集中供冷冷量调节系统的调节方法。The invention relates to a central air-conditioning energy-saving control technology, in particular to an adjustment method for an area centralized cooling supply adjustment system.

背景技术 Background technique

区域集中供冷由于具有能源使用效率提高,环境热污染低,可以有效降低设备容量和减少机房占地面积等优点,正在世界范围内快速推广使用,已经成为现代空调发展的重要方面。但是区域集中供冷也带来了以下技术难题:District centralized cooling has the advantages of improved energy efficiency, low environmental heat pollution, and can effectively reduce equipment capacity and reduce the floor area of the machine room. It is being rapidly promoted and used worldwide, and has become an important aspect of the development of modern air conditioning. However, district central cooling also brings the following technical difficulties:

(1)制冷系统能效比降低:常规建筑暖通空调设计供回水温度为7℃/12℃,由于区域供冷二级冷量交换站板式换热器换热特性决定了管网回水温度低于建筑空调回水温度,为了提高管网冷冻水输送效率,减少区域供冷管网投资,目前区域集中供冷一般采用降低管网供水温度(一般为2~3℃),实现大温差(一般为10℃左右)、小流量低温供水。在运行过程中,为了保证管网实现大温差、小流量工艺设计参数,二级冷量交换站供冷量调节采用以下两种方式:①恒温差控制,即以恒定温差为控制目标,通过调节板式换热器一次侧(管网侧)供水流量满足用户冷负荷变化。②恒供水温度控制,即以用户侧恒定供水温度为控制目标,通过调节板式换热器一次侧(管网侧)供水流量实现用户侧供水温度恒定。这两种控制方式都会使得管网冷冻供水温度过低,造成冷冻站制冷主机效率下降(在制冷量不变的前提下,电制冷主机冷冻出水温度每降低1℃,主机能耗增加2%~3%),生产相同冷量所需能耗增加。(采用冰蓄冷技术的区域供冷系统在制冰过程中,制冷机效率更是远远低于制冷状态),因此低温供水带来了制冷系统能效比降低的问题;(1) The energy efficiency ratio of the refrigeration system is reduced: the design supply and return water temperature of HVAC in conventional buildings is 7°C/12°C, and the return water temperature of the pipe network is determined by the heat transfer characteristics of the plate heat exchanger in the secondary cooling exchange station of the district cooling system. Lower than the return water temperature of building air conditioners, in order to improve the chilled water delivery efficiency of the pipe network and reduce the investment in the district cooling pipe network, the current regional centralized cooling generally adopts the method of reducing the water supply temperature of the pipe network (generally 2-3°C) to achieve a large temperature difference ( Generally around 10 ℃), small flow and low temperature water supply. In the process of operation, in order to ensure that the pipeline network achieves large temperature difference and small flow process design parameters, the cooling capacity adjustment of the secondary cooling capacity exchange station adopts the following two methods: ①Constant temperature difference control, that is, with constant temperature difference as the control target, The water supply flow rate on the primary side (pipe network side) of the plate heat exchanger meets the changes in the user's cooling load. ②Constant water supply temperature control, that is, the constant water supply temperature on the user side is the control target, and the water supply temperature on the user side is constant by adjusting the water supply flow rate on the primary side (pipe network side) of the plate heat exchanger. These two control methods will make the temperature of the chilled water supply in the pipe network too low, resulting in a decrease in the efficiency of the refrigeration unit of the refrigeration station (under the premise of constant cooling capacity, the energy consumption of the main unit will increase by 2% for every 1°C decrease in the chilled water outlet temperature of the electric refrigeration unit. 3%), the energy consumption required to produce the same cooling capacity increases. (In the ice-making process of the district cooling system using ice storage technology, the efficiency of the refrigerator is much lower than the cooling state), so the low-temperature water supply brings about the problem of lower energy efficiency ratio of the refrigeration system;

(2)供冷水泵的能耗大:由于区域供冷距离远、管网阻力大,供冷水泵功率及扬程远远大于常规中央空调冷水泵,如何有效减少水流量,降低水泵电能消耗,是提高区域供冷效率需要解决的关键问题之一;(2) The energy consumption of the cooling water pump is large: due to the long distance of regional cooling and the large resistance of the pipe network, the power and head of the cooling water pump are much larger than that of the conventional central air-conditioning cooling water pump. How to effectively reduce the water flow and reduce the power consumption of the pump is a must One of the key issues to be solved to improve the efficiency of district cooling;

(3)区域供冷室外管网冷量损失大:由于区域集中供冷管网距离达到几公里至数十公里,低温供水管道与周边介质温差过大会造成冷量损失增加。(3) The cooling capacity loss of the outdoor pipe network of the district cooling is large: Since the distance of the regional centralized cooling pipe network reaches several kilometers to tens of kilometers, the temperature difference between the low-temperature water supply pipe and the surrounding medium will increase the cooling capacity loss.

发明内容Contents of the invention

本发明的目的在于克服上述现有技术的缺点和不足,提供区域集中供冷冷量调节系统的调节方法,其可以大幅度提高供冷管网供水温度,提高制冷主机运行效率,而且可以在一定程度上提高供冷管网供回水温差,降低供冷水泵功率消耗,减少供冷管道冷量损失。The purpose of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide an adjustment method for the regional centralized cooling cooling capacity adjustment system, which can greatly increase the water supply temperature of the cooling pipe network, improve the operating efficiency of the refrigeration host, and can Increase the temperature difference between the supply and return water of the cooling pipe network to a certain extent, reduce the power consumption of the cooling water pump, and reduce the loss of cooling capacity of the cooling pipe.

本发明的目的通过下述技术方案实现:本区域集中供冷冷量调节系统,包括冷冻站服务器、冷冻站控制器、二级冷量交换站控制器、末端控制器、远程监控计算机、本地监控计算机,所述冷冻站服务器通过转换器与冷冻站控制器及二级冷量交换站控制器连接,多个远程监控计算机通过转换器与冷冻站控制器及多个二级冷量交换站控制器连接,每个二级冷量交换站控制器通过工业控制网络与本地监控计算机及多个末端控制器分别连接。The object of the present invention is achieved through the following technical solutions: the regional centralized cooling cooling capacity adjustment system includes a freezing station server, a freezing station controller, a secondary cooling exchange station controller, a terminal controller, a remote monitoring computer, a local monitoring Computer, the freezing station server is connected with the freezing station controller and the secondary cooling capacity exchange station controller through the converter, and multiple remote monitoring computers are connected with the freezing station controller and multiple secondary cooling capacity exchange station controllers through the converter Connection, each secondary cooling exchange station controller is connected to the local monitoring computer and multiple terminal controllers respectively through the industrial control network.

为了更好得实现本发明,所述冷冻站控制器连接有模拟量输入模块、模拟量输出模块、数字量输入模块、数字量输出模块;模拟量输入模块与制冷主机、冷水变频循环水泵、冰蓄冷系统变频循环水泵、制冷主机出水温度传感器、制冷主机出水流量计、冰蓄冷系统出水温度传感器、冰蓄冷系统出水流量计、冷冻站板式热交换器一次侧供水温度传感器、冷冻站板式热交换器一次侧回水温度传感器、区域集中供冷管网供水温度传感器、区域集中供冷管网回水温度传感器、区域集中供冷管网变频循环供水泵、区域集中供冷管网供水流量计、区域集中供冷管网供回水压差传感器分别连接;所述模拟量输出模块、数字量输入模块、数字量输出模块分别与制冷主机、冷水变频循环水泵、冰蓄冷系统变频循环水泵、区域集中供冷管网变频循环供水泵连接。In order to better realize the present invention, the controller of the freezing station is connected with an analog input module, an analog output module, a digital input module, and a digital output module; Frequency conversion circulating water pump of cold storage system, outlet water temperature sensor of refrigeration host, outlet water flowmeter of refrigeration host, outlet water temperature sensor of ice storage system, outlet water flowmeter of ice storage system, primary side water supply temperature sensor of plate heat exchanger of freezing station, plate heat exchanger of freezing station Primary side return water temperature sensor, regional central cooling pipe network water supply temperature sensor, regional central cooling pipe network return water temperature sensor, regional central cooling pipe network frequency conversion circulating water supply pump, regional central cooling pipe network water supply flowmeter, regional The pressure difference sensors of the supply and return water in the centralized cooling pipe network are connected separately; the analog output module, digital input module, and digital output module are respectively connected to the refrigeration main engine, the cold water frequency conversion circulating water pump, the ice storage system frequency conversion circulating water pump, and the regional centralized power supply system. The cooling pipe network is connected to the frequency conversion circulating water supply pump.

所述二级冷量交换站控制器与二级冷量交换站板式热交换器一次侧供水温度传感器、二级冷量交换站板式热交换器一次侧回水温度传感器、建筑供冷管网供水温度传感器、建筑供冷管网回水温度传感器、二级冷量交换站板式热交换器一次侧供水流量调节阀、二级冷量交换站板式热交换器一次侧供水流量计、建筑供冷管网变频循环水泵、建筑供冷管网供回水压差传感器分别连接。The controller of the secondary cooling capacity exchange station, the primary side water supply temperature sensor of the plate heat exchanger of the secondary cooling capacity exchange station, the return water temperature sensor of the primary side of the plate heat exchanger of the secondary cooling capacity exchange station, and the water supply of the building cooling pipe network Temperature sensor, return water temperature sensor of building cooling pipe network, primary side water supply flow regulating valve of plate heat exchanger in secondary cooling capacity exchange station, primary side water supply flow meter of plate heat exchanger in secondary cooling capacity exchange station, building cooling pipe The network frequency conversion circulating water pump and the building cooling pipe network supply and return water pressure difference sensor are connected separately.

所述末端控制器与末端空调设备、末端空调设备供水流量调节阀、环境温湿度传感器分别连接。The terminal controller is respectively connected with the terminal air-conditioning equipment, the water supply flow regulating valve of the terminal air-conditioning equipment, and the ambient temperature and humidity sensor.

所述末端空调设备包括柜式空调机、风机盘管、新风机;所述环境温湿度传感器的测量区域包括室内及新风管道。The terminal air conditioner includes a cabinet air conditioner, a fan coil unit, and a fresh air fan; the measurement area of the ambient temperature and humidity sensor includes indoor and fresh air ducts.

本区域集中供冷冷量调节系统的调节方法,采用区域集中供冷三级逆向调节方式,包括中央空调末端空调设备冷量调节、区域集中供冷二级冷量交换站冷量调节、区域集中供冷管网供水温度调节,其中:The adjustment method of the regional centralized cooling cooling capacity adjustment system adopts the three-stage reverse adjustment method of the regional centralized cooling supply, including the cooling capacity adjustment of the central air-conditioning terminal air-conditioning equipment, the cooling capacity adjustment of the secondary cooling capacity exchange station of the regional centralized cooling supply, and the regional centralized cooling system. Water supply temperature regulation of the cooling pipe network, in which:

(一)所述中央空调末端空调设备冷量调节,是指根据末端空调设备冷量计算公式:Q=Cp*q*ΔT,其中Q为冷负荷,Cp为水的比热容,ΔT为末端空调设备的供回水温差,通过维持末端空调设备供水流量q恒定,以制冷区域温、湿度满足设定范围T≤Tmax,RH≤RHmax为控制目标,对建筑供冷管网供水温度进行调节,从而使ΔT变化,实现中央空调末端空调设备冷量调节,其步骤包括:(1) The adjustment of the cooling capacity of the central air-conditioning terminal air-conditioning equipment refers to the calculation formula of the cooling capacity of the terminal air-conditioning equipment: Q=Cp*q*ΔT, where Q is the cooling load, Cp is the specific heat capacity of water, and ΔT is the terminal air-conditioning equipment The temperature difference between supply and return water, by maintaining the water supply flow q of the terminal air-conditioning equipment constant, with the temperature and humidity in the cooling area satisfying the set range T≤Tmax, RH≤RHmax as the control target, the water supply temperature of the building cooling pipe network is adjusted, so that ΔT changes to realize the cooling capacity adjustment of the central air-conditioning terminal air-conditioning equipment, and the steps include:

(1)通过末端控制器将末端空调设备供水流量调节阀开至100%;(1) Open the water flow regulating valve of the terminal air-conditioning equipment to 100% through the terminal controller;

(2)通过二级冷量交换站控制器的模拟量输出模块调节二级冷量交换站板式热交换器一次侧供水调节阀开度,使二级冷量交换站板式热交换器一次侧供水流量计数值变化,从而使建筑供冷管网供水温度和末端空调设备供回水温差ΔT变化,实现对末端空调设备冷量调节。(2) Adjust the opening of the water supply regulating valve on the primary side of the plate heat exchanger of the secondary cooling energy exchange station through the analog output module of the controller of the secondary cooling energy exchange station, so that the primary side water supply of the plate heat exchanger of the secondary cooling energy exchange station The flow counter value changes, so that the water supply temperature of the building cooling pipe network and the temperature difference ΔT of the supply and return water of the terminal air-conditioning equipment change, and the cooling capacity of the terminal air-conditioning equipment is adjusted.

(二)所述区域集中供冷二级冷量交换站冷量调节,其步骤包括:(2) The cooling capacity adjustment of the secondary cooling capacity exchange station of the regional centralized cooling supply, the steps include:

(1)自动查找温、湿度点为最不利工作点的末端空调设备并进行冷量调节:当采用区域集中供冷的二级冷量交换站开始工作时,建筑冷负荷为最大,通过二级冷量交换站控制器的模拟量输出模块将二级冷量交换站板式热交换器一次侧供水流量调节阀开度调节至100%;通过末端控制器启动需要制冷的末端空调设备,并将末端空调设备供水流量调节阀开至100%,实现快速制冷;(1) Automatically find the terminal air-conditioning equipment whose temperature and humidity are the most unfavorable working points and adjust the cooling capacity: when the secondary cooling capacity exchange station adopting regional centralized cooling starts to work, the cooling load of the building is the largest, and through the secondary The analog quantity output module of the controller of the cooling capacity exchange station adjusts the opening of the water supply flow regulating valve on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station to 100%; The water supply flow regulating valve of air conditioning equipment is opened to 100% to realize rapid cooling;

当所有需要制冷区域的环境温湿度传感器测得的温、湿度达到设定范围即T≤Tmax,RH≤RHmax后,由于室内冷负荷减小,室内温、湿度开始下降,此时二级冷量交换站控制器通过模拟量输出模块将二级冷量交换站板式热交换器一次侧供水流量调节阀开度减小,使二级冷量交换站板式热交换器一次侧供水流量减少,从而提高建筑供冷管网供水温度,当建筑内出现第一个环境温、湿度测量值超出设定值上限(T>Tmax或RH>RHmax)时,该温、湿度点即为当前最不利工作点;When the temperature and humidity measured by the ambient temperature and humidity sensors in all cooling areas reach the set range, that is, T≤Tmax, RH≤RHmax, the indoor temperature and humidity begin to drop due to the reduction of the indoor cooling load. At this time, the secondary cooling capacity The exchange station controller reduces the opening of the water supply flow regulating valve on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station through the analog output module, so that the primary side water supply flow rate of the plate heat exchanger of the secondary cooling capacity exchange station is reduced, thereby improving The water supply temperature of the building's cooling pipe network. When the first ambient temperature and humidity measurement in the building exceeds the upper limit of the set value (T>Tmax or RH>RHmax), this temperature and humidity point is the current most unfavorable working point;

此时通过末端控制器继续保持该最不利工作点末端空调设备供水流量调节阀开度最大,同时,以使该最不利工作点T≤Tmax,RH≤RHmax为控制目标,通过二级冷量交换站控制器调节二级冷量交换站板式热交换器一次侧供水流量调节阀开度,使二级冷量交换站板式热交换器一次侧供水流量变化,从而使建筑供冷管网供水温度及末端空调设备的供回水温差ΔT值变化,实现对该最不利工作点环境温、湿度的控制和该最不利工作点对应冷负荷的自动调节;此时得到的建筑供冷管网供水温度值为Tg即为该建筑二级冷量交换站当前建筑供冷管网供水温度控制目标值;此时,对于非最不利工作点环境温、湿度的调节则由末端控制器通过调节末端空调设备供水调节阀开度,调节末端空调设备供水流量实现;At this time, the terminal controller continues to maintain the most unfavorable working point of the water supply flow regulating valve of the terminal air-conditioning equipment with the largest opening. The station controller adjusts the opening of the water supply flow regulating valve on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station, so that the flow rate of the primary side water supply of the plate heat exchanger of the secondary cooling capacity exchange station changes, so that the water supply temperature of the building cooling pipe network and The temperature difference ΔT of the supply and return water of the terminal air-conditioning equipment changes to realize the control of the ambient temperature and humidity of the most unfavorable working point and the automatic adjustment of the cooling load corresponding to the most unfavorable working point; the water supply temperature value of the building cooling pipe network obtained at this time Tg is the current water supply temperature control target value of the building's cooling pipe network at the secondary cooling exchange station of the building; at this time, the adjustment of the ambient temperature and humidity of the non-most unfavorable working point is controlled by the terminal controller by adjusting the water supply of the terminal air-conditioning equipment Adjust the opening of the valve to adjust the water supply flow of the terminal air-conditioning equipment;

(2)最不利工作点的动态辨识及建筑供冷管网供水温度值Tg的动态调节:由于建筑内部冷负荷的变化,最不利工作点不是恒定的,当供冷系统出现第二台末端空调设备对应的制冷区域环境温、湿度高于设定值(T>Tmax或RH>RHmax),且通过末端控制器测得该末端空调设备供水流量调节阀开度为100%,该末端空调设备一直处于制冷运行状态时,则该温、湿度点成为新的当前最不利工作点,此时建筑供冷管网供水温度按新的最不利工作点依据区域集中供冷二级冷量交换站冷量调节步骤(1)进行调节控制;(2) Dynamic identification of the most unfavorable working point and dynamic adjustment of the water supply temperature Tg of the building cooling pipe network: due to the change of the cooling load inside the building, the most unfavorable working point is not constant. When the cooling system has a second terminal air conditioner The ambient temperature and humidity of the refrigeration area corresponding to the equipment are higher than the set value (T>Tmax or RH>RHmax), and the opening degree of the water flow regulating valve of the terminal air-conditioning equipment measured by the terminal controller is 100%, and the terminal air-conditioning equipment has been When it is in the cooling operation state, the temperature and humidity point becomes the new most unfavorable working point at present. At this time, the water supply temperature of the building cooling pipe network is based on the new most unfavorable working point according to the cooling capacity of the regional centralized cooling secondary cooling capacity exchange station. The adjustment step (1) is to adjust and control;

(3)当最不利工作点RH=RHmax时环境温度的调节:由末端控制器通过调节末端空调设备供水流量调节阀开度,调节末端空调设备供水流量实现。(3) When the most unfavorable working point RH=RHmax, the adjustment of the ambient temperature is realized by the terminal controller by adjusting the opening of the water flow regulating valve of the terminal air-conditioning equipment to adjust the water supply flow of the terminal air-conditioning equipment.

(三)所述区域集中供冷管网供水温度调节,其步骤包括:(3) Adjusting the water supply temperature of the regional centralized cooling pipe network, the steps include:

(1)自动查找Tg最小和二级冷量交换站板式热交换器一次侧供水流量调节阀开度最大的最不利工作点二级冷量交换站:在所有二级冷量交换站实现步骤(一)、(二)之后,冷冻站服务器通过转换器采集所有二级冷量交换站控制器中建筑供冷管网供水温度值Tg、二级冷量交换站板式热交换器一次侧供水流量调节阀开度值K,并对所有Tg和K进行比较,得到Tg最小值Tg-min和K最大值Kmax,Tg-min和Kmax对应的二级冷量交换站即为最不利工作点的二级冷量交换站(在正常情况下,由于Tg越小,q需求越大,K越大,Tg-min和Kmax出现在同一个二级冷量交换站);(1) Automatically find the most unfavorable working point with the minimum Tg and the maximum opening of the water supply flow regulating valve on the primary side of the plate heat exchanger at the secondary cooling exchange station. The secondary cooling exchange station: implement steps ( After 1) and (2), the freezing station server collects the water supply temperature value Tg of the building cooling pipe network in the controllers of all secondary cooling capacity exchange stations through the converter, and the water supply flow rate adjustment of the primary side of the plate heat exchanger of the secondary cooling capacity exchange station Valve opening value K, and compare all Tg and K to get Tg minimum Tg-min and K maximum Kmax, the secondary cooling capacity exchange station corresponding to Tg-min and Kmax is the secondary of the most unfavorable working point Cooling capacity exchange station (under normal circumstances, since the smaller the Tg, the greater the demand for q, the greater the K, Tg-min and Kmax appear in the same secondary cooling capacity exchange station);

(2)冷冻站供冷出水温度调节:冷冻站服务器通过转换器将Tg-min和Kmax值发送给冷冻站控制器,冷冻站控制器以Tg-min为控制目标,以使Kmax≤90%(其余10%作为二级冷量交换站预留的冷量调节余量)为约束条件,通过模拟量输出模块调节制冷主机出水温度给定值,或调节冰蓄冷系统变频循环水泵的频率给定以调节冰水流量调节区域供冷管网供水温度值,实现对Tg-min的随动控制;(2) Temperature adjustment of cooling outlet water in the freezing station: the freezing station server sends the Tg-min and Kmax values to the freezing station controller through the converter, and the freezing station controller takes Tg-min as the control target so that Kmax≤90% ( The remaining 10% is used as the cooling capacity adjustment margin reserved by the secondary cooling capacity exchange station) as a constraint condition, adjust the given value of the outlet water temperature of the refrigeration host through the analog output module, or adjust the frequency given by the variable frequency circulating water pump of the ice storage system Adjust the ice water flow to adjust the water supply temperature value of the regional cooling pipe network to realize the follow-up control of Tg-min;

(3)冷冻站供冷最小供回水压差ΔPmin确定及供水流量调节:冷冻站服务器通过转换器向所有二级冷量交换站控制器发出二级冷量交换站板式热交换器一次侧供水调节阀开启至100%强制指令,并读取所有二级冷量交换站板式热交换器一次侧供水调节阀开度值,当所有二级冷量交换站板式热交换器一次侧供水调节阀开启至100%后,再读取二级冷量交换站板式热交换器一次侧供水流量q值并向冷冻站控制器发出管网流量调节指令,冷冻站控制器通过模拟量输出模块和数字量输出模块调节区域供冷变频供水泵频率和台数,使所有二级冷量交换站板式热交换器一次侧供水流量q值达到设计流量,此时冷冻站控制器测得的冷冻站供冷供回水压差ΔP即为最小供回水压差ΔPmin,获得ΔPmin后,冷冻站服务器通过转换器向所有二级冷量交换站控制器发出二级冷量交换站板式热交换器一次侧供水调节阀开启至100%解除指令,冷冻站控制器以ΔPmin为供回水压差设定值,通过模拟量输出模块和数字量输出模块调节区域供冷变频供水泵频率和台数,使ΔPmin维持恒定,实现对区域供冷流量的调节;(3) Determination of the minimum supply and return water pressure difference ΔPmin for cooling in the freezing station and adjustment of the water supply flow: the server of the freezing station sends water supply to the primary side of the plate heat exchanger of the secondary cooling exchange station to the controllers of all secondary cooling exchange stations through the converter Open the regulating valve to 100% mandatory command, and read the opening value of the water supply regulating valve on the primary side of the plate heat exchanger of all secondary cooling capacity exchange stations. After reaching 100%, read the q value of the water supply flow rate at the primary side of the plate heat exchanger in the secondary cooling exchange station and issue a pipe network flow adjustment command to the controller of the freezing station. The module adjusts the frequency and number of variable frequency water supply pumps for district cooling, so that the flow rate q of the primary side water supply of plate heat exchangers in all secondary cooling exchange stations reaches the design flow rate. At this time, the cooling supply and return water of the refrigeration station measured by the controller of the refrigeration station The pressure difference ΔP is the minimum supply and return water pressure difference ΔPmin. After obtaining ΔPmin, the server of the freezing station sends a signal to the controllers of all secondary cooling exchange stations through the converter. When the command is released to 100%, the controller of the refrigeration station takes ΔPmin as the set value of the pressure difference between the supply and return water, and adjusts the frequency and number of district cooling variable frequency water supply pumps through the analog output module and digital output module to keep ΔPmin constant and achieve Regulation of district cooling flow;

(4)最不利二级冷量交换站的动态辨识:冷冻站服务器通过转换器不断采集所有二级冷量交换站控制器中建筑供冷管网供水温度值Tg、二级冷量交换站板式热交换器一次侧供水流量调节阀开度值K,并对所有Tg和K进行比较,得到当前Tg最小值Tg-min和K最大值Kmax,Tg-min和Kmax对应的二级冷量交换站即为当前最不利工作点的二级冷量交换站,此时冷冻站按上述区域集中供冷管网供水温度调节的步骤(2)进行调节。(4) Dynamic identification of the most unfavorable secondary cooling exchange station: the server of the freezing station continuously collects the water supply temperature value Tg of the building cooling pipe network in the controller of all secondary cooling exchange stations through the converter, the plate type of the secondary cooling exchange station The opening value K of the water supply flow regulating valve on the primary side of the heat exchanger, and compare all Tg and K to obtain the current Tg minimum value Tg-min and K maximum value Kmax, and the secondary cooling capacity exchange station corresponding to Tg-min and Kmax It is the secondary cooling capacity exchange station at the most unfavorable working point at present. At this time, the freezing station is adjusted according to the above-mentioned step (2) of water supply temperature adjustment of the regional centralized cooling pipe network.

本发明与现有技术相比,具有如下优点和有益效果:Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1)减少水流量,降低水泵能耗:采用上述中央空调末端设备冷量调节方法和区域集中供冷二级冷量交换站冷量调节方法,可以有效提高建筑供冷管网供水温度和回水温度,使区域供冷管网供回水温差增大,供冷水流量减少。在集中供冷管网供水温度不变的前提下,可以将管网回水温度提高30%以上,使供水水泵流量减少30%以上,供水泵节能30%以上;(1) Reduce water flow and reduce energy consumption of water pumps: The cooling capacity adjustment method of the central air-conditioning terminal equipment and the cooling capacity adjustment method of the regional centralized cooling secondary cooling capacity exchange station can effectively improve the water supply temperature and return rate of the building cooling pipe network. The temperature of the water will increase the temperature difference between the supply and return water of the regional cooling pipe network and reduce the flow of cooling water. On the premise that the water supply temperature of the central cooling pipe network remains unchanged, the return water temperature of the pipe network can be increased by more than 30%, so that the flow rate of the water supply pump can be reduced by more than 30%, and the water supply pump can save energy by more than 30%.

(2)减小主机能耗,提高制冷主机效率:采用上述区域集中供冷管网供水温度调节方法,在保证集中供冷一次侧管网供回水温差不变前提下,可以将供冷管网的供水和回水温度提高3~6℃,使冷冻站制冷主机效率提高约6%~18%;(2) Reduce the energy consumption of the main engine and improve the efficiency of the refrigeration main engine: By adopting the above-mentioned water supply temperature adjustment method of the regional centralized cooling pipe network, the cooling pipe can be adjusted under the premise that the water supply and return water temperature difference of the central cooling primary side pipe network remains unchanged The temperature of the water supply and return water in the network is increased by 3-6°C, which increases the efficiency of the refrigeration host of the refrigeration station by about 6%-18%;

(3)减少区域供冷室外管网冷量损失:由于供回水温度的提高,可以减少冷冻水输送过程中的冷量损失10%~30%。(3) Reduce the loss of cooling capacity in the outdoor pipe network of district cooling: due to the increase in the temperature of the supply and return water, the loss of cooling capacity during the transportation of chilled water can be reduced by 10% to 30%.

(4)在干燥气候条件下,由于建筑供冷管网供水温度提高,可以有效减少室内水分散失,避免环境湿度过低,提高环境舒适度,同时减少空调系统潜热负荷冷量消耗。(4) Under dry climate conditions, due to the increase in the water supply temperature of the building's cooling pipe network, it can effectively reduce indoor water loss, avoid low ambient humidity, improve environmental comfort, and reduce the latent heat load cooling capacity consumption of the air conditioning system.

(5)降低区域集中供冷系统冷量单价成本,减少用户空调费用支出。(5) Reduce the unit price cost of the cooling capacity of the regional centralized cooling system, and reduce the user's air-conditioning expenses.

附图说明 Description of drawings

图1为区域集中供冷系统结构原理图;Figure 1 is a structural schematic diagram of the regional centralized cooling system;

图2为冷冻站供冷系统结构原理图;Figure 2 is a structural schematic diagram of the cooling system of the freezing station;

图3为建筑供冷中央空调系统结构原理图;Figure 3 is a structural schematic diagram of the central air-conditioning system for building cooling;

图4为中央空调末端设备冷量调节工作原理图;Figure 4 is a schematic diagram of the cooling capacity adjustment of the central air-conditioning terminal equipment;

图5为本发明区域集中供冷冷量调节系统结构原理图;Fig. 5 is a structural principle diagram of the regional centralized cooling cooling capacity adjustment system of the present invention;

图6为图5所示冷冻站控制器结构原理图;Fig. 6 is a structural schematic diagram of the controller of the freezing station shown in Fig. 5;

图7为图5所示二级冷量交换站控制器结构原理图。Fig. 7 is a structural schematic diagram of the controller of the secondary cooling capacity exchange station shown in Fig. 5 .

具体实施方式 Detailed ways

下面结合实施例及附图,对本发明作进一步地详细说明,但本发明的实施方式不限于此。The present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

实施例Example

如图1~3所示,依次为目前的区域集中供冷系统及其冷冻站供冷系统、建筑供冷中央空调系统的系统结构,其中:As shown in Figures 1 to 3, the system structure of the current regional centralized cooling system, its refrigeration station cooling system, and building cooling central air-conditioning system is shown in turn, among which:

1、冷冻站,2、区域集中供冷管网供水管道,3、区域集中供冷管网回水管道,4、二级冷量交换站,5、建筑供冷管网供水管道,6、建筑供冷管网回水管道,7、末端空调设备(包括柜式空调机、风机盘管和新风机),8、制冷主机,9、冷水变频循环水泵,10、蓄冰池,11、冰蓄冷系统变频循环水泵,12、制冷主机出水温度传感器,13、制冷主机出水流量计,14、冰蓄冷系统出水温度传感器,15、冰蓄冷系统出水流量计,16、冷冻站板式换热器,17、冷冻站板式换热器一次侧供水温度传感器,18、冷冻站板式换热器一次侧回水温度传感器,19、区域集中供冷管网供水温度传感器,20、区域集中供冷管网回水温度传感器,21、区域集中供冷管网变频循环水泵,22、区域集中供冷管网供水流量计,23、区域集中供冷管网供回水压差传感器,24、二级冷量交换站板式换热器,25、二级冷量交换站板式换热器一次侧供水温度传感器,26、二级冷量交换站板式换热器一次侧回水温度传感器,27、建筑供冷管网供水温度传感器,28、建筑供冷管网回水温度传感器,29、二级冷量交换站板式换热器一次侧供水流量调节阀,30、二级冷量交换站板式热交换器一次侧供水流量计,31、建筑供冷管网变频循环水泵,32、建筑供冷管网供回水压差传感器,33、末端空调设备供水流量调节阀,34、末端控制器,35、环境温湿度传感器1. Freezing station, 2. Water supply pipeline of regional centralized cooling pipe network, 3. Return water pipe of regional centralized cooling pipe network, 4. Secondary cooling capacity exchange station, 5. Water supply pipe of building cooling pipe network, 6. Building Cooling pipe network return pipe, 7. Terminal air-conditioning equipment (including cabinet air conditioners, fan coil units and fresh air fans), 8. Refrigeration host, 9. Cold water frequency conversion circulating water pump, 10. Ice storage tank, 11. Ice storage System frequency conversion circulating water pump, 12. Water outlet temperature sensor of refrigeration host, 13. Water outlet flowmeter of refrigeration host, 14. Ice storage system outlet water temperature sensor, 15. Ice storage system outlet water flowmeter, 16. Freezing station plate heat exchanger, 17, Primary side water supply temperature sensor of the plate heat exchanger in the freezing station, 18. Primary side return water temperature sensor of the plate heat exchanger in the freezing station, 19. Water supply temperature sensor of the regional centralized cooling pipe network, 20. Return water temperature of the regional centralized cooling pipe network Sensors, 21. Frequency conversion circulating water pump of regional centralized cooling pipe network, 22. Water supply flow meter of regional centralized cooling pipe network, 23. Pressure difference sensor of supply and return water of regional centralized cooling pipe network, 24. Plate type of secondary cooling capacity exchange station Heat exchanger, 25. Primary side water supply temperature sensor of the plate heat exchanger of the secondary cooling capacity exchange station, 26. Primary side return water temperature sensor of the plate type heat exchanger of the secondary cooling capacity exchange station, 27. Water supply temperature of the building cooling pipe network Sensor, 28. Return water temperature sensor of building cooling pipe network, 29. Water supply flow regulating valve on the primary side of the plate heat exchanger in the secondary cooling capacity exchange station, 30. Water supply flowmeter on the primary side of the plate heat exchanger in the secondary cooling capacity exchange station , 31. Frequency conversion circulating water pump of building cooling pipe network, 32. Pressure difference sensor of supply and return water of building cooling pipe network, 33. Water supply flow regulating valve of terminal air-conditioning equipment, 34. Terminal controller, 35. Environmental temperature and humidity sensor

本发明区域集中供冷冷量调节系统,适用于对上述区域集中供冷系统及其冷冻站供冷系统、建筑供冷中央空调系统进行供冷冷量调节。如图5所示,本区域集中供冷冷量调节系统,包括冷冻站服务器40、冷冻站控制器36、二级冷量交换站控制器37、末端控制器34、远程监控计算机41、本地监控计算机38,冷冻站服务器40通过转换器39与冷冻站控制器36及二级冷量交换站控制器37连接,多个远程监控计算机41通过转换器39与冷冻站控制器36及多个二级冷量交换站控制器37连接,每个二级冷量交换站控制器37通过工业控制网络与本地监控计算机38及多个末端控制器34分别连接。The cooling capacity adjustment system for regional centralized cooling of the present invention is suitable for adjusting the cooling capacity of the above-mentioned regional centralized cooling system, its refrigeration station cooling system, and building cooling central air-conditioning system. As shown in Figure 5, the regional centralized cooling cooling capacity adjustment system includes a freezing station server 40, a freezing station controller 36, a secondary cooling capacity exchange station controller 37, a terminal controller 34, a remote monitoring computer 41, a local monitoring Computer 38, freezing station server 40 are connected with freezing station controller 36 and secondary refrigeration exchange station controller 37 through converter 39, and multiple remote monitoring computers 41 are connected with freezing station controller 36 and multiple secondary cooling station controllers through converter 39 The cooling capacity exchange station controller 37 is connected, and each secondary cooling capacity exchange station controller 37 is connected with a local monitoring computer 38 and a plurality of terminal controllers 34 through an industrial control network.

如图7所示,冷冻站控制器36连接有模拟量输入模块、模拟量输出模块、数字量输入模块、数字量输出模块;模拟量输入模块与制冷主机8、冷水变频循环水泵9、冰蓄冷系统变频循环水泵11、制冷主机出水温度传感器12、制冷主机出水流量计13、冰蓄冷系统出水温度传感器14、冰蓄冷系统出水流量计15、冷冻站板式热交换器一次侧供水温度传感器17、冷冻站板式热交换器一次侧回水温度传感器18、区域集中供冷管网供水温度传感器19、区域集中供冷管网回水温度传感器20、区域集中供冷管网变频循环供水泵21、区域集中供冷管网供水流量计22、区域集中供冷管网供回水压差传感器23分别连接;模拟量输出模块、数字量输入模块、数字量输出模块分别与制冷主机8、冷水变频循环水泵9、冰蓄冷系统变频循环水泵11、区域集中供冷管网变频循环供水泵21连接。As shown in Figure 7, the freezing station controller 36 is connected with an analog input module, an analog output module, a digital input module, and a digital output module; System frequency conversion circulating water pump 11, refrigeration host water outlet temperature sensor 12, refrigeration host outlet water flow meter 13, ice storage system outlet water temperature sensor 14, ice storage system outlet water flow meter 15, plate heat exchanger primary side water supply temperature sensor 17 of the refrigeration station, Station plate heat exchanger primary side return water temperature sensor 18, regional centralized cooling pipe network water supply temperature sensor 19, regional centralized cooling pipe network return water temperature sensor 20, regional centralized cooling pipe network frequency conversion circulating water supply pump 21, regional centralized The water supply flow meter 22 of the cooling pipe network and the differential pressure sensor 23 of the water supply and return water of the regional centralized cooling pipe network are connected respectively; 1. The frequency conversion circulating water pump 11 of the ice storage system is connected with the frequency conversion circulating water supply pump 21 of the regional centralized cooling pipe network.

如图6所示,二级冷量交换站控制器37与二级冷量交换站板式热交换器一次侧供水温度传感器25、二级冷量交换站板式热交换器一次侧回水温度传感器26、建筑供冷管网供水温度传感器27、建筑供冷管网回水温度传感器28、二级冷量交换站板式热交换器一次侧供水流量调节阀29、二级冷量交换站板式热交换器一次侧供水流量计30、建筑供冷管网变频循环水泵31、建筑供冷管网供回水压差传感器32分别连接。As shown in Figure 6, the controller 37 of the secondary cooling capacity exchange station is connected with the primary side water supply temperature sensor 25 of the plate heat exchanger of the secondary cooling capacity exchange station, and the return water temperature sensor 26 of the primary side of the plate heat exchanger of the secondary cooling capacity exchange station. , Building cooling pipe network water supply temperature sensor 27, building cooling pipe network return water temperature sensor 28, secondary cooling capacity exchange station plate heat exchanger primary side water supply flow regulating valve 29, secondary cooling capacity exchange station plate heat exchanger The water supply flowmeter 30 on the primary side, the frequency conversion circulating water pump 31 of the building cooling pipe network, and the differential pressure sensor 32 of the water supply and return water of the building cooling pipe network are respectively connected.

如图3所示,末端控制器34与末端空调设备7、末端空调设备供水流量调节阀33、环境温湿度传感器35分别连接。As shown in FIG. 3 , the terminal controller 34 is respectively connected with the terminal air conditioner 7 , the water supply flow regulating valve 33 of the terminal air conditioner, and the ambient temperature and humidity sensor 35 .

末端空调设备7包括柜式空调机、风机盘管、新风机;环境温湿度传感器35的测量区域包括室内及新风管道。The terminal air conditioner 7 includes a cabinet air conditioner, a fan coil unit, and a fresh air fan; the measurement area of the ambient temperature and humidity sensor 35 includes indoor and fresh air ducts.

本区域集中供冷冷量调节系统的调节过程,是采用区域集中供冷三级逆向调节方式,包括中央空调末端空调设备冷量调节、区域集中供冷二级冷量交换站冷量调节、区域集中供冷管网供水温度调节,其中:The adjustment process of the regional centralized cooling capacity adjustment system adopts the three-stage reverse adjustment method of regional centralized cooling, including the adjustment of the cooling capacity of the central air-conditioning terminal air-conditioning equipment, the cooling capacity adjustment of the secondary cooling capacity exchange station of the regional centralized cooling, and the area Central cooling pipe network water supply temperature regulation, of which:

(一)所述中央空调末端空调设备冷量调节,是指根据末端空调设备冷量计算公式:Q=Cp*q*ΔT,其中Q为冷负荷,Cp为水的比热容,ΔT为末端空调设备的供回水温差,通过维持末端空调设备供水流量q恒定,以制冷区域温、湿度满足设定范围T≤Tmax,RH≤RHmax为控制目标,对建筑供冷管网供水温度进行调节,从而使ΔT变化,实现中央空调末端空调设备冷量调节。(1) The adjustment of the cooling capacity of the central air-conditioning terminal air-conditioning equipment refers to the calculation formula of the cooling capacity of the terminal air-conditioning equipment: Q=Cp*q*ΔT, where Q is the cooling load, Cp is the specific heat capacity of water, and ΔT is the terminal air-conditioning equipment The temperature difference between supply and return water, by maintaining the water supply flow q of the terminal air-conditioning equipment constant, with the temperature and humidity in the cooling area satisfying the set range T≤Tmax, RH≤RHmax as the control target, the water supply temperature of the building cooling pipe network is adjusted, so that The change of ΔT realizes the adjustment of the cooling capacity of the central air-conditioning terminal air-conditioning equipment.

如图4所示,Tmax为制冷区域温度设定值上限,Td为满足制冷区域湿度设定值上限RHmax对应的建筑供冷供水温度上限,曲线3为冷负荷Q变化曲线。曲线1、2分别为本发明冷负荷Q变化过程中建筑供冷供水温度供水温度和末端空调设备回水温度调节曲线。曲线T1、T2分别为冷负荷Q变化过程中常规中央空调系统末端空调设备供水温度和回水温度曲线,常规中央空调系统的末端空调设备冷量调节采用维持建筑供冷供水温度和末端空调设备回水温度恒定,通过调节供水流量来调节冷量。Tg、Th和Tgo、Tho分别为某一冷负荷下,两种调节方法相应的建筑供冷供水温度和末端空调设备回水温度工作点。从图4中工作点位置可以看出,采用本发明冷量调节方法可以有效提高建筑供冷供水温度和末端空调设备回水温度。As shown in Figure 4, Tmax is the upper limit of the temperature setting value of the cooling area, Td is the upper limit of the building cooling water supply temperature corresponding to the upper limit of the humidity setting value RHmax of the cooling area, and curve 3 is the cooling load Q change curve. Curves 1 and 2 are the adjustment curves of the building cooling supply water temperature and the return water temperature of the terminal air-conditioning equipment during the change process of the cooling load Q in the present invention. Curves T1 and T2 are the water supply temperature and return water temperature curves of the terminal air-conditioning equipment in the conventional central air-conditioning system during the change of cooling load Q respectively. The water temperature is constant, and the cooling capacity is adjusted by adjusting the water supply flow. Tg, Th, Tgo, Tho are respectively under a certain cooling load, the working points of the cooling water supply temperature of the building and the return water temperature of the terminal air-conditioning equipment corresponding to the two adjustment methods. It can be seen from the position of the working point in Fig. 4 that the cooling capacity adjustment method of the present invention can effectively increase the cooling water supply temperature of the building and the return water temperature of the terminal air-conditioning equipment.

本发明所述中央空调末端空调设备冷量调节,步骤包括:The cooling capacity adjustment of the central air-conditioning terminal air-conditioning equipment of the present invention, the steps include:

(1)通过末端控制器34将末端空调设备供水流量调节阀33开至100%;(1) Open the water supply flow regulating valve 33 of the terminal air conditioner to 100% through the terminal controller 34;

(2)通过二级冷量交换站控制器37的模拟量输出模块调节二级冷量交换站板式热交换器一次侧供水调节阀29开度,使二级冷量交换站板式热交换器一次侧供水流量计30数值变化,从而使建筑供冷管网供水温度和末端空调设备供回水温差ΔT变化,实现对末端空调设备7冷量调节。(2) Adjust the opening degree of the water supply regulating valve 29 on the primary side of the plate heat exchanger of the secondary cooling energy exchange station through the analog output module of the controller 37 of the secondary cooling energy exchange station, so that the primary side of the plate heat exchanger of the secondary cooling energy exchange station The value of the side water supply flowmeter 30 changes, so that the water supply temperature of the building cooling pipe network and the temperature difference ΔT of the supply and return water of the terminal air-conditioning equipment change, and the cooling capacity of the terminal air-conditioning equipment 7 is adjusted.

(二)所述区域集中供冷二级冷量交换站冷量调节,其步骤包括:(2) The cooling capacity adjustment of the secondary cooling capacity exchange station of the regional centralized cooling supply, the steps include:

(1)自动查找温、湿度点为最不利工作点的末端空调设备并进行冷量调节:当采用区域集中供冷的二级冷量交换站开始工作时,建筑冷负荷为最大,二级冷量交换站控制器37通过模拟量输出模块将二级冷量交换站板式热交换器一次侧供水流量调节阀29开度调节至100%;通过末端控制器34启动需要制冷的末端空调设备7,并将末端空调设备供水流量调节阀33开至100%,实现快速制冷;(1) Automatically find the terminal air-conditioning equipment whose temperature and humidity point is the most unfavorable working point and adjust the cooling capacity: when the secondary cooling capacity exchange station adopting regional centralized cooling starts to work, the cooling load of the building is the largest, and the secondary cooling capacity The quantity exchange station controller 37 adjusts the opening degree of the water supply flow regulating valve 29 on the primary side of the plate heat exchanger of the secondary cooling quantity exchange station to 100% through the analog quantity output module; through the terminal controller 34, the terminal air conditioner 7 that needs refrigeration is started, And open the water supply flow regulating valve 33 of the terminal air-conditioning equipment to 100% to realize rapid cooling;

当所有需要制冷的区域的环境温湿度传感器35测得的温、湿度达到设定范围即T≤Tmax,RH≤RHmax后,由于室内冷负荷减小,室内温、湿度开始下降,此时二级冷量交换站控制器37通过模拟量输出模块将二级冷量交换站板式热交换器一次侧供水流量调节阀29开度减小,使二级冷量交换站板式热交换器供水流量计30数值减少,从而使建筑供冷管网供水温度升高,当建筑内出现第一个环境温、湿度测量值高于设定值上限(T>Tmax或RH>RHmax)时,该温、湿度点即为当前最不利工作点;When the temperature and humidity measured by the ambient temperature and humidity sensors 35 in all areas that need cooling reach the set range, that is, T≤Tmax, RH≤RHmax, due to the reduction of the indoor cooling load, the indoor temperature and humidity begin to drop. The cooling capacity exchange station controller 37 reduces the opening degree of the water supply flow regulating valve 29 on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station through the analog quantity output module, so that the water supply flow meter 30 of the plate heat exchanger of the secondary cooling capacity exchange station The numerical value decreases, so that the water supply temperature of the building's cooling pipe network increases. When the first ambient temperature and humidity measurement value in the building is higher than the upper limit of the set value (T>Tmax or RH>RHmax), the temperature and humidity point It is the most unfavorable working point at present;

此时通过末端控制器34继续保持该最不利工作点末端空调设备供水流量调节阀33开度最大,同时,以使该最不利工作点T≤Tmax,RH≤RHmax为控制目标,通过二级冷量交换站控制器37调节二级冷量交换站板式热交换器一次侧供水流量调节阀29开度,使二级冷量交换站板式热交换器一次侧供水流量变化,从而使建筑供冷管网供水温度及末端空调设备的供回水温差ΔT值变化,实现对该最不利工作点环境温、湿度的控制和该最不利工作点对应冷负荷的自动调节;此时得到的建筑供冷管网供水温度值为Tg即为该建筑二级冷量交换站当前建筑供冷管网供水温度控制目标值;此时,对于非最不利工作点环境温、湿度的调节则由末端控制器34通过调节末端空调设备供水调节阀33开度,调节末端空调设备7供水流量实现;At this time, the terminal controller 34 continues to keep the most unfavorable working point of the water supply flow regulating valve 33 of the terminal air-conditioning equipment at the largest opening. The controller 37 of the volume exchange station adjusts the opening degree of the water supply flow regulating valve 29 on the primary side of the plate heat exchanger of the secondary cooling energy exchange station, so that the flow rate of the primary side water supply of the plate heat exchanger of the secondary cooling energy exchange station changes, so that the cooling pipe of the building The change of network water supply temperature and the temperature difference ΔT between supply and return water of terminal air-conditioning equipment realizes the control of the ambient temperature and humidity of the most unfavorable working point and the automatic adjustment of the cooling load corresponding to the most unfavorable working point; the building cooling pipe obtained at this time The network water supply temperature value Tg is the current building cooling pipe network water supply temperature control target value of the secondary cooling capacity exchange station of the building; Adjust the opening degree of the water supply regulating valve 33 of the terminal air-conditioning equipment, and adjust the water supply flow rate of the terminal air-conditioning equipment 7;

(2)最不利工作点的动态辨识及建筑供冷管网供水温度值Tg的动态调节:由于建筑内部冷负荷的变化,最不利工作点不是恒定的,当供冷系统出现第二台末端空调设备7对应的环境温、湿度高于设定值,且通过末端控制器34测得到该末端空调设备供水流量调节阀33开度为100%,该末端空调设备7一直处于运行状态时,则该温、湿度点成为新的当前最不利工作点,此时建筑供冷管网供水温度按新的最不利工作点依据区域集中供冷二级冷量交换站冷量调节步骤(1)进行调节控制;(2) Dynamic identification of the most unfavorable working point and dynamic adjustment of the water supply temperature Tg of the building cooling pipe network: due to the change of the cooling load inside the building, the most unfavorable working point is not constant. When the cooling system has a second terminal air conditioner The ambient temperature and humidity corresponding to the equipment 7 are higher than the set value, and the opening degree of the water flow regulating valve 33 of the terminal air-conditioning equipment measured by the terminal controller 34 is 100%, and the terminal air-conditioning equipment 7 is always in the running state, then the The temperature and humidity points become the new most unfavorable working point at present. At this time, the water supply temperature of the building cooling pipe network is adjusted and controlled according to the new most unfavorable working point according to the cooling capacity adjustment step (1) of the regional centralized cooling secondary cooling capacity exchange station. ;

(3)当最不利工作点RH=RHmax时环境温度的调节:由末端控制器34通过调节末端空调设备供水流量调节阀33开度,调节末端空调设备7供水流量实现。(3) Adjustment of the ambient temperature when the most unfavorable operating point RH=RHmax: the terminal controller 34 adjusts the water supply flow rate of the terminal air conditioner 7 by adjusting the opening of the water supply flow regulating valve 33 of the terminal air conditioner.

(三)所述区域集中供冷管网供水温度调节,其步骤包括:(3) Adjusting the water supply temperature of the regional centralized cooling pipe network, the steps include:

(1)自动查找Tg最小和二级冷量交换站板式热交换器一次侧供水流量调节阀开度最大的最不利工作点的二级冷量交换站:在所有二级冷量交换站4实现步骤(一)、(二)之后,冷冻站服务器40通过转换器39采集所有二级冷量交换站控制器37中建筑供冷管网供水温度值Tg、二级冷量交换站板式热交换器一次侧供水流量调节阀29开度值K,并对所有Tg和K进行比较,得到Tg最小值Tg-min和K最大值Kmax,Tg-min和Kmax对应的二级冷量交换站4即为最不利工作点的二级冷量交换站4:(1) Automatically find the minimum Tg and the secondary cooling exchange station at the most unfavorable working point with the largest opening of the water supply flow regulating valve on the primary side of the plate heat exchanger: realized in all secondary cooling exchange stations 4 After steps (1) and (2), the freezing station server 40 collects the water supply temperature values Tg of the building cooling pipe network in the controller 37 of all secondary cooling capacity exchange stations, the plate heat exchangers of the secondary cooling capacity exchange stations through the converter 39 The primary side water supply flow regulating valve 29 has an opening value K, and compares all Tg and K to obtain the minimum Tg Tg-min and the maximum K Kmax, and the secondary cooling exchange station 4 corresponding to Tg-min and Kmax is Secondary cooling exchange station 4 at the most unfavorable working point:

(2)冷冻站供冷出水温度调节:冷冻站服务器40通过转换器39将Tg-min和Kmax值发送给冷冻站控制器36,冷冻站控制器36以Tg-min为控制目标,以使Kmax≤90%(其余10%作为二级冷量交换站预留的冷量调节余量)为约束条件,通过模拟量输出模块调节制冷主机8出水温度给定值,或调节冰蓄冷系统变频循环水泵11的频率给定以调节冰水流量调节区域供冷管网供水温度值,实现对Tg-min的随动控制;(2) Adjustment of the cooling outlet water temperature of the freezing station: the freezing station server 40 sends the Tg-min and Kmax values to the freezing station controller 36 through the converter 39, and the freezing station controller 36 takes Tg-min as the control target so that Kmax ≤90% (the remaining 10% is reserved as the cooling capacity adjustment margin of the secondary cooling capacity exchange station) as the constraint condition, adjust the given value of the outlet water temperature of the cooling host 8 through the analog output module, or adjust the frequency conversion circulating water pump of the ice storage system The frequency of 11 is given to adjust the flow of ice water to adjust the water supply temperature value of the regional cooling pipe network to realize the follow-up control of Tg-min;

(3)冷冻站供冷最小供回水压差ΔPmin确定及供水流量调节:冷冻站服务器40通过转换器39向所有二级冷量交换站控制器37发出二级冷量交换站板式热交换器一次侧供水调节阀29开启至100%强制指令,并读取所有二级冷量交换站板式热交换器一次侧供水调节阀29开度值,当所有二级冷量交换站板式热交换器一次侧供水调节阀29开启至100%后,再读取二级冷量交换站板式热交换器一次侧供水流量计30数值,并向冷冻站控制器36发出管网流量调节指令,冷冻站控制器36通过模拟量输出模块和数字量输出模块调节区域集中供冷管网变频循环水泵21频率和台数,使所有二级冷量交换站板式热交换器一次侧供水流量计30数值达到设计流量,此时冷冻站控制器36测得的冷冻站1供冷供回水压差ΔP即为最小供回水压差ΔPmin,获得ΔPmin后,冷冻站服务器40通过转换器39向所有二级冷量交换站控制器37发出二级冷量交换站板式热交换器一次侧供水调节阀开启至100%解除指令,冷冻站控制器36以ΔPmin为供回水压差设定值,通过模拟量输出模块和数字量输出模块调节区域集中供冷管网变频循环水泵21频率和台数,使ΔPmin维持恒定,实现对区域供冷流量的调节;(3) Determination of the minimum supply and return water pressure difference ΔPmin for cooling of the freezing station and adjustment of the water supply flow: the server 40 of the freezing station sends the plate heat exchanger of the secondary cooling station to all the controllers 37 of the secondary cooling station through the converter 39 The water supply regulating valve 29 on the primary side is opened to 100% mandatory command, and read the opening value of the water supply regulating valve 29 on the primary side of all secondary cooling capacity exchange station plate heat exchangers, when all the secondary cooling capacity exchange station plate heat exchangers After the side water supply regulating valve 29 is opened to 100%, read the value of the primary side water supply flowmeter 30 of the plate heat exchanger of the secondary cooling exchange station, and send a pipe network flow adjustment command to the freezing station controller 36, and the freezing station controller 36 Adjust the frequency and number of variable frequency circulating water pumps 21 in the regional central cooling pipe network through the analog output module and digital output module, so that the values of the water supply flowmeters 30 on the primary side of the plate heat exchangers in all secondary cooling exchange stations reach the design flow. The pressure difference ΔP of the cooling supply and return water of the refrigeration station 1 measured by the controller 36 of the refrigeration station is the minimum supply and return water pressure difference ΔPmin. The controller 37 issues an instruction to release the water supply regulating valve on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station until it reaches 100%. The volume output module adjusts the frequency and number of variable frequency circulating water pumps 21 in the regional centralized cooling pipe network to keep ΔPmin constant and realize the adjustment of the regional cooling flow;

(4)最不利二级冷量交换站的动态辨识:冷冻站服务器40通过转换器39不断采集所有二级冷量交换站控制器37中建筑供冷管网供水温度值Tg、二级冷量交换站板式热交换器一次侧供水流量调节阀29开度值K,并对所有Tg和K进行比较,得到当前Tg最小值Tg-min和K最大值Kmax,Tg-min和Kmax对应的二级冷量交换站4即为当前最不利工作点的二级冷量交换站4,此时冷冻站1按上述区域集中供冷管网供水温度调节的步骤(2)进行调节。(4) Dynamic identification of the most unfavorable secondary cooling capacity exchange station: the server 40 of the freezing station continuously collects the water supply temperature value Tg and the secondary cooling capacity of the building cooling pipe network in the controller 37 of all secondary cooling capacity exchange stations through the converter 39 The opening value K of the water supply flow regulating valve 29 on the primary side of the plate heat exchanger in the exchange station, and compare all Tg and K to obtain the current minimum Tg Tg-min and K maximum Kmax, and the secondary level corresponding to Tg-min and Kmax The cooling capacity exchange station 4 is the secondary cooling capacity exchange station 4 at the current most unfavorable working point. At this time, the refrigeration station 1 is adjusted according to the step (2) of the water supply temperature adjustment of the regional centralized cooling network.

如上所述,便可较好地实现本发明。As described above, the present invention can be preferably carried out.

Claims (4)

1、区域集中供冷冷量调节方法,其特征在于:采用区域集中供冷三级逆向调节方式,其依次包括中央空调末端设备冷量调节、区域集中供冷二级冷量交换站冷量调节、区域集中供冷管网供水温度调节这三个步骤。1. The cooling capacity adjustment method of regional centralized cooling, which is characterized in that it adopts a three-stage reverse adjustment method of regional centralized cooling, which successively includes the cooling capacity adjustment of central air-conditioning terminal equipment, and the cooling capacity adjustment of the secondary cooling capacity exchange station of regional centralized cooling 1. The three steps of water supply temperature adjustment of regional centralized cooling pipe network. 2、按权利要求1所述区域集中供冷冷量调节方法,其特征在于所述中央空调末端空调设备冷量调节,是指根据末端空调设备冷量Q=Cp*q*ΔT,其中Q为冷负荷,Cp为水的比热容,ΔT为末端空调设备的供回水温差,通过维持末端空调设备供水流量q恒定,以制冷区域温、湿度满足设定范围T≤Tmax,RH≤RHmax为控制目标,对建筑供冷管网供水温度进行调节,从而使ΔT变化,实现中央空调末端空调设备冷量调节,其步骤包括:2. According to the method for adjusting the cooling capacity of regional centralized cooling according to claim 1, it is characterized in that the adjustment of the cooling capacity of the central air-conditioning terminal air-conditioning equipment refers to the cooling capacity Q=Cp*q*ΔT of the terminal air-conditioning equipment, where Q is Cooling load, Cp is the specific heat capacity of water, ΔT is the temperature difference between the supply and return water of the terminal air-conditioning equipment, by maintaining the water supply flow q of the terminal air-conditioning equipment constant, the temperature and humidity of the cooling area meet the set range T≤Tmax, RH≤RHmax is the control target , to adjust the water supply temperature of the building cooling pipe network, so as to change ΔT, and realize the cooling capacity adjustment of the central air-conditioning terminal air-conditioning equipment. The steps include: (1)通过末端控制器将末端空调设备供水流量调节阀开至100%;(1) Open the water flow regulating valve of the terminal air-conditioning equipment to 100% through the terminal controller; (2)通过二级冷量交换站控制器的模拟量输出模块调节二级冷量交换站板式热交换器一次侧供水调节阀开度,使二级冷量交换站板式热交换器一次侧供水流量计数值变化,从而使建筑供冷管网供水温度和末端空调设备供回水温差ΔT变化,实现对末端空调设备冷量调节。(2) Adjust the opening of the water supply regulating valve on the primary side of the plate heat exchanger of the secondary cooling energy exchange station through the analog output module of the controller of the secondary cooling energy exchange station, so that the primary side water supply of the plate heat exchanger of the secondary cooling energy exchange station The flow counter value changes, so that the water supply temperature of the building cooling pipe network and the temperature difference ΔT of the supply and return water of the terminal air-conditioning equipment change, and the cooling capacity of the terminal air-conditioning equipment is adjusted. 3、按权利要求2所述区域集中供冷冷量调节方法,其特征在于所述区域集中供冷二级冷量交换站冷量调节,其步骤包括:3. According to claim 2, the cooling capacity adjustment method for regional centralized cooling is characterized in that the cooling capacity of the secondary cooling capacity exchange station for regional centralized cooling is adjusted, and the steps include: (1)自动查找温、湿度点为最不利工作点的末端空调设备并进行冷量调节:当采用区域集中供冷的二级冷量交换站开始工作时,建筑冷负荷为最大,通过二级冷量交换站控制器的模拟量输出模块将二级冷量交换站板式热交换器一次侧供水流量调节阀开度调节至100%;通过末端控制器启动需要制冷的末端空调设备,并将末端空调设备供水流量调节阀开至100%,实现快速制冷;(1) Automatically find the terminal air-conditioning equipment whose temperature and humidity are the most unfavorable working points and adjust the cooling capacity: when the secondary cooling capacity exchange station adopting regional centralized cooling starts to work, the cooling load of the building is the largest, and through the secondary The analog quantity output module of the controller of the cooling capacity exchange station adjusts the opening of the water supply flow regulating valve on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station to 100%; The water supply flow regulating valve of air conditioning equipment is opened to 100% to realize rapid cooling; 当所有需要制冷区域的环境温湿度传感器测得的温、湿度达到设定范围即T≤Tmax,RH≤RHmax后,由于室内冷负荷减小,室内温、湿度开始下降,此时二级冷量交换站控制器通过模拟量输出模块将二级冷量交换站板式热交换器一次侧供水流量调节阀开度减小,使二级冷量交换站板式热交换器一次侧供水流量减少,从而提高建筑供冷管网供水温度,当建筑内出现第一个环境温、湿度测量值超出设定值上限即T>Tmax或RH>RHmax时,该温、湿度点即为当前最不利工作点;When the temperature and humidity measured by the ambient temperature and humidity sensors in all cooling areas reach the set range, that is, T≤Tmax, RH≤RHmax, the indoor temperature and humidity begin to drop due to the reduction of the indoor cooling load. At this time, the secondary cooling capacity The exchange station controller reduces the opening of the water supply flow regulating valve on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station through the analog output module, so that the primary side water supply flow rate of the plate heat exchanger of the secondary cooling capacity exchange station is reduced, thereby improving The water supply temperature of the building's cooling pipe network. When the first ambient temperature and humidity measurement in the building exceeds the upper limit of the set value, that is, T>Tmax or RH>RHmax, this temperature and humidity point is the current most unfavorable working point; 此时通过末端控制器继续保持该最不利工作点末端空调设备供水流量调节阀开度最大,同时,以使该最不利工作点T≤Tmax,RH≤RHmax为控制目标,通过二级冷量交换站控制器调节二级冷量交换站板式热交换器一次侧供水流量调节阀开度,使二级冷量交换站板式热交换器一次侧供水流量变化,从而使建筑供冷管网供水温度及末端空调设备的供回水温差ΔT值变化,实现对该最不利工作点环境温、湿度的控制和该最不利工作点对应冷负荷的自动调节;此时得到的建筑供冷管网供水温度值为Tg即为该建筑二级冷量交换站当前建筑供冷管网供水温度控制目标值;此时,对于非最不利工作点环境温、湿度的调节则由末端控制器通过调节末端空调设备供水调节阀开度,调节末端空调设备供水流量实现;At this time, the terminal controller continues to maintain the most unfavorable working point of the water supply flow regulating valve of the terminal air-conditioning equipment with the largest opening. The station controller adjusts the opening of the water supply flow regulating valve on the primary side of the plate heat exchanger of the secondary cooling capacity exchange station, so that the flow rate of the primary side water supply of the plate heat exchanger of the secondary cooling capacity exchange station changes, so that the water supply temperature of the building cooling pipe network and The temperature difference ΔT of the supply and return water of the terminal air-conditioning equipment changes to realize the control of the ambient temperature and humidity of the most unfavorable working point and the automatic adjustment of the cooling load corresponding to the most unfavorable working point; the water supply temperature value of the building cooling pipe network obtained at this time Tg is the current water supply temperature control target value of the building's cooling pipe network at the secondary cooling exchange station of the building; at this time, the adjustment of the ambient temperature and humidity of the non-most unfavorable working point is controlled by the terminal controller by adjusting the water supply of the terminal air-conditioning equipment Adjust the opening of the valve to adjust the water supply flow of the terminal air-conditioning equipment; (2)最不利工作点的动态辨识及建筑供冷管网供水温度值Tg的动态调节:由于建筑内部冷负荷的变化,最不利工作点不是恒定的,当供冷系统出现第二台末端空调设备对应的环境温、湿度高于设定值即T>Tmax或RH>RHmax,且通过末端控制器测得该末端空调设备供水流量调节阀开度为100%,该末端空调设备一直处于运行状态时,则该温、湿度点成为新的当前最不利工作点,此时建筑供冷管网供水温度按新的最不利工作点依据区域集中供冷二级冷量交换站冷量调节步骤(1)进行调节控制;(2) Dynamic identification of the most unfavorable working point and dynamic adjustment of the water supply temperature Tg of the building cooling pipe network: due to the change of the cooling load inside the building, the most unfavorable working point is not constant. When the cooling system has a second terminal air conditioner The ambient temperature and humidity corresponding to the equipment are higher than the set value, that is, T>Tmax or RH>RHmax, and the opening degree of the water flow regulating valve of the terminal air-conditioning equipment measured by the terminal controller is 100%, and the terminal air-conditioning equipment is always in the running state , then the temperature and humidity point becomes the new most unfavorable working point at present. At this time, the water supply temperature of the building cooling pipe network is adjusted according to the new most unfavorable working point according to the cooling capacity of the regional centralized cooling secondary cooling capacity exchange station (1 ) for regulatory control; (3)当最不利工作点RH=RHmax时环境温度的调节:由末端控制器通过调节末端空调设备供水流量调节阀开度,调节末端空调设备供水流量实现。(3) When the most unfavorable working point RH=RHmax, the adjustment of the ambient temperature is realized by the terminal controller by adjusting the opening of the water flow regulating valve of the terminal air-conditioning equipment to adjust the water supply flow of the terminal air-conditioning equipment. 4、按权利要求3所述区域集中供冷冷量调节方法,其特征在于所述区域集中供冷管网供水温度调节,其步骤包括:4. The cooling capacity adjustment method for regional centralized cooling according to claim 3, characterized in that the water supply temperature of the regional centralized cooling pipe network is adjusted, and the steps include: (1)自动查找Tg最小和二级冷量交换站板式热交换器一次侧供水流量调节阀开度最大的最不利工作点二级冷量交换站:在所有二级冷量交换站实现中央空调末端设备冷量调节、区域集中供冷二级冷量交换站冷量调节这两个步骤之后,冷冻站服务器通过转换器采集所有二级冷量交换站控制器中建筑供冷管网供水温度值Tg、二级冷量交换站板式热交换器一次侧供水流量调节阀开度值K,并对所有Tg和K进行比较,得到Tg最小值Tg-min和K最大值Kmax,Tg-min和Kmax对应的二级冷量交换站即为最不利工作点的二级冷量交换站;(1) Automatically find the most unfavorable working point with the minimum Tg and the maximum opening of the water supply flow regulating valve on the primary side of the plate heat exchanger at the secondary cooling capacity exchange station. After the two steps of adjusting the cooling capacity of the terminal equipment and adjusting the cooling capacity of the secondary cooling capacity exchange station for regional centralized cooling, the server of the freezing station collects the water supply temperature values of the building cooling pipe network in the controllers of all the secondary cooling capacity exchange stations through the converter Tg, the opening value K of the water supply flow regulating valve on the primary side of the plate heat exchanger in the secondary cooling exchange station, and compare all Tg and K to obtain the minimum value of Tg Tg-min and the maximum value of K Kmax, Tg-min and Kmax The corresponding secondary cooling exchange station is the secondary cooling exchange station of the most unfavorable working point; (2)冷冻站供冷出水温度调节:冷冻站服务器通过转换器将Tg-min和Kmax值发送给冷冻站控制器,冷冻站控制器以Tg-min为控制目标,以使Kmax≤90%为约束条件,通过模拟量输出模块调节制冷主机出水温度给定值,或调节冰蓄冷系统变频循环水泵的频率给定以调节冰水流量调节区域供冷管网供水温度值,实现对Tg-min的随动控制;(2) Temperature adjustment of the cooling outlet water of the freezing station: the server of the freezing station sends the Tg-min and Kmax values to the controller of the freezing station through the converter, and the controller of the freezing station takes Tg-min as the control target so that Kmax≤90% is Constraint conditions, through the analog output module to adjust the given value of the outlet water temperature of the refrigeration main engine, or adjust the frequency given by the frequency conversion circulating water pump of the ice storage system to adjust the water supply temperature value of the cooling pipe network in the ice water flow adjustment area, and realize the Tg-min follow-up control; (3)冷冻站供冷最小供回水压差ΔPmin确定及供水流量调节:冷冻站服务器通过转换器向所有二级冷量交换站控制器发出二级冷量交换站板式热交换器一次侧供水调节阀开启至100%强制指令,并读取所有二级冷量交换站板式热交换器一次侧供水调节阀开度值,当所有二级冷量交换站板式热交换器一次侧供水调节阀开启至100%后,再读取二级冷量交换站板式热交换器一次侧供水流量q值并向冷冻站控制器发出管网流量调节指令,冷冻站控制器通过模拟量输出模块和数字量输出模块调节区域供冷变频供水泵频率和台数,使所有二级冷量交换站板式热交换器一次侧供水流量q值达到设计流量,此时冷冻站控制器测得的冷冻站供冷供回水压差ΔP即为最小供回水压差ΔPmin,获得ΔPmin后,冷冻站服务器通过转换器向所有二级冷量交换站控制器发出二级冷量交换站板式热交换器一次侧供水调节阀开启至100%解除指令,冷冻站控制器以ΔPmin为供回水压差设定值,通过模拟量输出模块和数字量输出模块调节区域供冷变频供水泵频率和台数,使ΔPmin维持恒定,实现对区域供冷流量的调节;(3) Determination of the minimum supply and return water pressure difference ΔPmin for cooling in the freezing station and adjustment of the water supply flow: the server of the freezing station sends water supply to the primary side of the plate heat exchanger of the secondary cooling exchange station to the controllers of all secondary cooling exchange stations through the converter Open the regulating valve to 100% mandatory command, and read the opening value of the water supply regulating valve on the primary side of the plate heat exchanger of all secondary cooling capacity exchange stations. After reaching 100%, read the q value of the water supply flow rate at the primary side of the plate heat exchanger in the secondary cooling exchange station and issue a pipe network flow adjustment command to the controller of the freezing station. The module adjusts the frequency and number of variable frequency water supply pumps for district cooling, so that the flow rate q of the primary side water supply of plate heat exchangers in all secondary cooling exchange stations reaches the design flow rate. At this time, the cooling supply and return water of the refrigeration station measured by the controller of the refrigeration station The pressure difference ΔP is the minimum supply and return water pressure difference ΔPmin. After obtaining ΔPmin, the server of the freezing station sends a signal to the controllers of all secondary cooling exchange stations through the converter. When the command is released to 100%, the controller of the refrigeration station takes ΔPmin as the set value of the pressure difference between the supply and return water, and adjusts the frequency and number of district cooling variable frequency water supply pumps through the analog output module and digital output module to keep ΔPmin constant and achieve Regulation of district cooling flow; (4)最不利二级冷量交换站的动态辨识:冷冻站服务器通过转换器不断采集所有二级冷量交换站控制器中建筑供冷管网供水温度值Tg、二级冷量交换站板式热交换器一次侧供水流量调节阀开度值K,并对所有Tg和K进行比较,得到当前Tg最小值Tg-min和K最大值Kmax,Tg-min和Kmax对应的二级冷量交换站即为当前最不利工作点的二级冷量交换站,此时冷冻站按上述区域集中供冷管网供水温度调节的步骤(2)进行调节。(4) Dynamic identification of the most unfavorable secondary cooling exchange station: the server of the freezing station continuously collects the water supply temperature value Tg of the building cooling pipe network in the controller of all secondary cooling exchange stations through the converter, the plate type of the secondary cooling exchange station The opening value K of the water supply flow regulating valve on the primary side of the heat exchanger, and compare all Tg and K to obtain the current Tg minimum value Tg-min and K maximum value Kmax, and the secondary cooling capacity exchange station corresponding to Tg-min and Kmax It is the secondary cooling capacity exchange station at the most unfavorable working point at present. At this time, the freezing station is adjusted according to the above-mentioned step (2) of water supply temperature adjustment of the regional centralized cooling pipe network.
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