Automatic control method for five-hierarchy system of air, water, quality and variable

Abstract

The application discloses a five-harmony system variable air variable water variable quality variable quantity automatic control method, which comprises the following steps: S1, data sensing and parameter evaluation; S2, automatic judgment of seasonal modes; and S3, automatically entering corresponding mode control methods according to different seasonal modes, so that full-automatic, multi-mode intelligent switching and preventive regulation can be realized.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology for air conditioning systems, specifically to a fully automatic intelligent control method for a five-balance (temperature, humidity, cleanliness, oxygen content, noise, and no draft) system coupled with a radiant cooling / heating and fresh air system, particularly suitable for independent temperature and humidity control systems in residential buildings without indoor fan coil units. Background Technology

[0002] As people's demands for indoor thermal comfort and air quality increase, five-balance systems are gradually being applied. These systems typically consist of radiant terminals (handling sensible heat load) and a fresh air system (handling latent heat load and air quality control). The two are independently adjustable, offering advantages such as energy saving, comfort, and no draft. However, current control methods have the following shortcomings:

[0003] 1. The operation mode switching relies on manual setting, and cooling, heating, and ventilation cannot be automatically identified based on outdoor meteorological parameters, indicating insufficient intelligence.

[0004] 2. The radiant system's water supply temperature operates at a fixed value or is passively adjusted only based on the indoor dew point as a safety boundary. The fresh air dehumidification capacity is also output at a fixed value. There is a lack of dynamic coupling logic between the two, making it impossible to coordinate the adjustment of cooling and dehumidification output according to real-time changes in cooling demand, resulting in poor system adaptability.

[0005] 3. The energy output regulation of the cold and heat sources is not linked to the actual output demand of the radiant terminals and the fresh air dehumidification capacity demand, which affects both comfort and reduces the system's operating energy efficiency;

[0006] 4. Strong solar radiation in summer causes room temperature to rise rapidly, and the system often only responds passively after the room temperature has significantly exceeded the limit, resulting in a lag in regulation.

[0007] 5. During transitional seasons and under moderate temperature and humidity conditions, the system failed to actively switch to fresh air cooling / heating mode and failed to shut down the radiant terminals in a timely manner, resulting in unnecessary energy consumption. Summary of the Invention

[0008] To address the aforementioned problems, this invention aims to provide a five-balance system control method capable of fully automatic, multi-mode intelligent switching, and preventative adjustment, thereby solving the following technical issues:

[0009] 1. Based on outdoor meteorological parameters, it automatically identifies and switches between cooling, heating, and ventilation modes, replacing manual settings;

[0010] 2. Construct a coupled control logic for fresh air dehumidification and radiant cooling: dynamically generate the radiant water supply temperature target based on the real-time cooling output demand, then deduce the indoor humidity target in reverse, and dynamically adjust the fresh air dehumidification output.

[0011] 3. Construct a coupled control logic for fresh air dehumidification, radiant cooling, and cold / heat source output: dynamically adjust the cold / heat source water temperature based on the target radiant water supply temperature and indoor humidity.

[0012] 4. In the summer high-temperature sub-mode, solar radiation illuminance is introduced as a feedforward signal to overcome the control lag caused by thermal inertia;

[0013] 5. Under moderate temperatures in winter and summer, as well as during transitional seasons, optimize equipment operation strategies, disable radiant terminals, and use fresh air to meet indoor comfort needs.

[0014] Therefore, the technical solution adopted by this invention is: an automatic control method for variable air, variable water, and variable quality variables in a five-balance system, wherein the five-balance system includes a radiant system, a fresh air system, a heat pump system, and a mixing center or heat exchange center, comprising the following steps:

[0015] S1. Data perception and parameter evaluation;

[0016] Outdoor temperature (Tw), outdoor absolute humidity (dw), total solar radiation, and indoor temperature, absolute humidity, dew point temperature, and CO2 concentration for each room were collected. The four sets of indoor data were then weighted and averaged to obtain the indoor temperature evaluation value (Tn), indoor absolute humidity evaluation value (dn), indoor dew point temperature evaluation value (Tdpn), and indoor CO2 concentration evaluation value (Cn). The formulas for the weighted average of the four sets of indoor data are as follows:

[0017]

[0018] in: —Evaluation values ​​for a certain indoor parameter, namely Tn, dn, Tdpn, and Cn;

[0019] —The panel status of the i-th room, enabled. =1, turn off =0;

[0020] —Measured value of a certain parameter in the i-th room;

[0021] —Room number;

[0022] —Total number of rooms;

[0023] S2, Seasonal mode is automatically determined;

[0024] The following main and sub-modes are automatically defined based on the outdoor temperature (Tw):

[0025] 1) If Tw > 24℃, enter summer cooling mode; where Tw > 28℃ is high temperature sub-mode, and 24 < Tw ≤ 28℃ is medium temperature sub-mode;

[0026] 2) If 18℃≤Tw≤24℃, enter the transitional season ventilation mode;

[0027] 3) If Tw < 18℃, enter winter heating mode; where 15℃ ≤ Tw < 18℃ is the medium temperature sub-mode, and Tw < 15℃ is the low temperature sub-mode.

[0028] S3. Automatically switch to the corresponding mode control method according to different seasonal modes;

[0029] 1) The operating mode of the summer high-temperature sub-mode is: radiant cooling system and fresh air system dehumidification. The control method is as follows:

[0030] a) The target value Tfg of the radiant terminal water temperature is determined based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset. The radiant terminal water temperature setpoint Tfgset is determined based on the target value Tfg of the radiant terminal water temperature and the indoor dew point temperature evaluation value Tdpn, i.e.:

[0031] Tn-Tnset≥1, Tfg=13, Tfgset=Max (Tdpn, Tfg);

[0032] 0.5≤Tn-Tnset<1, Tfg=14, Tfgset=Max(Tdpn,Tfg);

[0033] 0≤Tn-Tnset<0.5, Tfg=15, Tfgset=Max(Tdpn,Tfg);

[0034] -0.5≤Tn-Tnset<0, Tfg=16, Tfgset=Max(Tdpn+1,Tfg);

[0035] -1≤Tn-Tnset<-0.5, Tfg=17, Tfgset=Max (Tdpn+1, Tfg);

[0036] -1.5≤Tn-Tnset<-1, Tfg =18, Tfgset=Max (Tdpn+2, Tfg);

[0037] -2≤Tn-Tnset<-1.5, Tfg=19, Tfgset=Max (Tdpn+2, Tfg);

[0038] Tn-Tnset < -2, the radiation system is turned off, but Tfg = 19;

[0039] b) Determine the target value of indoor absolute humidity (dns) based on the target value of radiant terminal water temperature (Tfg), i.e.:

[0040] Tfg=13, dns=9g / kg;

[0041] Tfg=14, dns=10g / kg;

[0042] Tfg=15, dns=10.5g / kg;

[0043] Tfg=16, dns=11.5g / kg;

[0044] Tfg=17, dns=12g / kg;

[0045] Tfg≥18, dns=13g / kg;

[0046] c) Determine the target value of absolute moisture content in the supply air, das, and the air volume based on the difference between the indoor absolute moisture content evaluation value dn and the indoor absolute moisture content target value dns, i.e.:

[0047] dn–dns≥1, das=dns-3, high air volume;

[0048] 0≤dn–dns<1, das=dns-2, high airflow;

[0049] -1≤dn–dns<0, das=dns-1, low airflow setting;

[0050] dn–dns<-1, das=dns, low airflow setting;

[0051] d) Determine the target control method for fresh air supply based on the outdoor absolute moisture content dw and the target value of the supply air absolute moisture content das, i.e.:

[0052] dw>das, the fresh air is controlled by the target value of the absolute moisture content of the supply air, das;

[0053] If dw≤das, the fresh air is controlled by the target value of supply air temperature Tas, where Tas=Tnset;

[0054] e) Determine the target value of the chiller / heat source unit's water supply temperature Twg based on the target value of the absolute moisture content of the supply air das or the target value of the supply air temperature Tas and the setpoint of the radiant terminal water temperature Tfgset, that is:

[0055] dw>das, Twg = Max [Min (das - 2, Tfgset - 1), 6];

[0056] dw≤das, Twg = Min(Tas - 7, Tfgset - 1);

[0057] f) Increase preventative control measures – the sunshine mode, i.e.:

[0058] Triggering conditions: The following four conditions must be met simultaneously: ① Summer high temperature sub-mode is in operation; ② Indoor temperature evaluation value Tn ≥ Indoor temperature set value Tnset; ③ Total solar radiation irradiance ≥ 200W / ㎡; ④ Lasts for 10 minutes.

[0059] Control strategy: Set the target value of indoor absolute humidity dns to 9 g / kg and the set value of radiant terminal water temperature Tfgset to Max(Tdpn, 13).

[0060] The cancellation condition is that any one of the three conditions is met for 5 minutes: ① Summer high temperature sub-mode is cancelled; ② Indoor temperature evaluation value Tn < Indoor temperature set value Tnset; ③ Total solar radiation illuminance < 200W / ㎡;

[0061] 2) Summer Medium Temperature Sub-mode Operation: Only the radiant system is turned off, and the fresh air system alone is responsible for indoor temperature control, abandoning precise humidity control. The control method is as follows:

[0062] a) Determine the target value of the fresh air supply temperature (Tag) and the air volume based on the difference between the indoor temperature evaluation value (Tn) and the indoor temperature setpoint (Tnset), i.e.:

[0063] Tn-Tnset≥1, Tag=14, high airflow;

[0064] 0≤Tn-Tnset<1, Tag=16, high airflow;

[0065] -1≤Tn-Tnset<0, Tag=18, low airflow setting;

[0066] -2≤Tn-Tnset<-1, Tag=20, low airflow setting;

[0067] Tn-Tnset < -2, Tag = outdoor temperature, low airflow setting;

[0068] b) Determine the target value of the chiller / heat source unit's water supply temperature, Twg, based on the target value of the fresh air supply temperature, Tag.

[0069] Twg = Tag – 7;

[0070] When Tag = outdoor temperature, the heat source and cold source are turned off;

[0071] 3) The operating mode of the transitional season ventilation mode is as follows: the radiant system and heat pump system are turned off, and only the fresh air unit is operated. The air volume is automatically adjusted according to the difference between the indoor CO2 concentration evaluation value Cn and the indoor CO2 concentration set value Cnset. The ventilation control method is as follows:

[0072] Cn–Cnset≥0, high airflow rate;

[0073] Cn–Cnset < 0, low airflow setting;

[0074] 4) The operating mode of the winter low-temperature sub-mode is as follows: the radiant system undertakes the main heating task, and the fresh air system assists in temperature regulation. The control method is as follows:

[0075] a) Determine the target value Tfg of the radiant terminal water temperature based on the outdoor temperature Tw, i.e.:

[0076] Tw < 5, Tfg = 40;

[0077] 5≤Tw<10, Tfg=35;

[0078] 10≤Tw<15,Tfg=30;

[0079] b) Determine the radiant terminal water temperature setpoint Tfgset, the fresh air supply temperature target value Tag, and the air volume based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset, i.e.:

[0080] Tn-Tnset≤-1, Tfgset=Tfg+3, Tag=26, high airflow;

[0081] -1<Tn-Tnset≤0,Tfgset=Tfg+1,Tag=24,Airflow low setting;

[0082] 0 < Tn - Tnset ≤ 1, Tfgset = Tfg - 1, Tag = outdoor temperature, low airflow setting;

[0083] 1 < Tn - Tnset ≤ 2, Tfgset = Tfg - 3, Tag = outdoor temperature, low airflow setting;

[0084] Tn-Tnset > 2, turn off the radiant system, Tag = outdoor temperature, fan speed on high;

[0085] c) Determine the target value Twg of the chiller / heat source unit's water supply temperature based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset, i.e.:

[0086] When Tn-Tnset≤2, Twg=Max(Tfgset+1,Tag+7);

[0087] When Tn-Tnset>2, the heat source and cold source are turned off;

[0088] 5) The operating mode of the winter medium-temperature sub-mode is as follows: the radiant system is turned off, and only the fresh air system is responsible for indoor temperature control. The control method is as follows:

[0089] a) Determine the target value of the fresh air supply temperature (Tag) and the air volume based on the difference between the indoor temperature evaluation value (Tn) and the indoor temperature setpoint (Tnset), i.e.:

[0090] Tn-Tnset < -1, Tag = Tnset + 6, high airflow;

[0091] -1≤Tn-Tnset<-0.5, Tag=Tnset+4, high airflow;

[0092] -0.5≤Tn-Tnset<0, Tag=Tnset+2, high airflow;

[0093] 0≤Tn-Tnset<0.5, Tag=Tnset, low airflow setting;

[0094] 0.5≤Tn-Tnset<1, Tag=outdoor temperature, low airflow setting;

[0095] Tn-Tnset≥1, Tag=outdoor temperature, airflow high;

[0096] b) Determine the target value of the chiller / heat source unit's water supply temperature, Twg, based on the target value of the fresh air supply temperature, Tag.

[0097] Twg = Tag + 7;

[0098] When Tag = outdoor temperature, the heat source and cold source are turned off.

[0099] Compared with the prior art, the present invention has the following beneficial effects:

[0100] 1. Achieve fully automated operation: The system automatically judges and switches between cooling / heating / ventilation modes based on outdoor meteorological parameters. The indoor target humidity is automatically generated by the system without manual setting. All subsystems work together to complete the operation automatically, reducing the operating threshold.

[0101] 2. The fresh air dehumidification and radiant cooling are dynamically coupled. The radiant water supply temperature target is determined based on the real-time cooling capacity demand, and the indoor humidity target is generated in reverse. The fresh air dehumidification capacity is dynamically adjusted so that the two systems can adapt to each other and overcome the supply and demand disconnect caused by fixed value operation.

[0102] 3. Dynamic coupling between terminal demand and cold / heat source output: Adjust the outlet water temperature of the cold / heat source according to the requirements of radiant cooling output and fresh air dehumidification capacity to match energy output with terminal demand, avoid over-cooling / heating, and improve system energy efficiency.

[0103] 4. Introduce solar radiation illuminance as a feedforward signal to intervene and regulate before changes in heating and cooling loads are reflected in room temperature, thereby reducing room temperature fluctuations and ensuring comfort;

[0104] 5. Optimize the operation strategy for mid-temperature winter and summer and transitional seasons, utilize fresh air for cooling / heating, and shut down radiant terminals to minimize transmission and distribution energy consumption and significantly save energy. Detailed Implementation

[0105] The technical solutions of the present invention will be further described in detail below with reference to specific embodiments. The following embodiments are for illustration and explanation only and should not be construed as limiting the scope of protection of the present invention. All technical solutions implemented based on the above content of the present invention should fall within the protection scope of the present invention.

[0106] An automatic control method for variable air, water, and air quality in a five-balance system, comprising a radiant system, a fresh air system, a heat pump system, and a mixing center or heat exchange center, includes the following steps:

[0107] S1. Data perception and parameter evaluation;

[0108] Outdoor temperature Tw, outdoor absolute humidity dw, total solar radiation illuminance, and indoor temperature, absolute humidity, dew point temperature, and CO2 concentration of each room were collected. The four sets of indoor data were then weighted and averaged to obtain indoor temperature evaluation value Tn, indoor absolute humidity evaluation value dn, indoor dew point temperature evaluation value Tdpn, and indoor CO2 concentration evaluation value Cn.

[0109] The formulas for weighted averaging the four sets of indoor data are as follows:

[0110]

[0111] in: —Evaluation values ​​for a certain indoor parameter, namely Tn, dn, Tdpn, and Cn;

[0112] —The panel status of the i-th room, enabled. =1, turn off =0;

[0113] —Measured value of a certain parameter in the i-th room;

[0114] —Room number;

[0115] —Total number of rooms.

[0116] S2, Seasonal mode is automatically determined;

[0117] The following main and sub-modes are automatically defined based on the outdoor temperature (Tw):

[0118] 1) If Tw > 24℃, enter summer cooling mode; where Tw > 28℃ is high temperature sub-mode, and 24 < Tw ≤ 28℃ is medium temperature sub-mode;

[0119] 2) If 18℃≤Tw≤24℃, enter the transitional season ventilation mode;

[0120] 3) If Tw < 18℃, enter winter heating mode; where 15℃ ≤ Tw < 18℃ is the medium temperature sub-mode, and Tw < 15℃ is the low temperature sub-mode.

[0121] S3. Automatically switch to the corresponding mode control method according to different seasonal modes;

[0122] 1) The operating mode of the summer high-temperature sub-mode is: radiant cooling system and fresh air system dehumidification. The control method is as follows:

[0123] a) The target value Tfg of the radiant terminal water temperature is determined based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset. The radiant terminal water temperature setpoint Tfgset is determined based on the target value Tfg of the radiant terminal water temperature and the indoor dew point temperature evaluation value Tdpn, i.e.:

[0124] Tn-Tnset≥1, Tfg=13, Tfgset=Max (Tdpn, Tfg);

[0125] 0.5≤Tn-Tnset<1, Tfg=14, Tfgset=Max(Tdpn,Tfg);

[0126] 0≤Tn-Tnset<0.5, Tfg=15, Tfgset=Max(Tdpn,Tfg);

[0127] -0.5≤Tn-Tnset<0, Tfg=16, Tfgset=Max(Tdpn+1,Tfg);

[0128] -1≤Tn-Tnset<-0.5, Tfg=17, Tfgset=Max (Tdpn+1, Tfg);

[0129] -1.5≤Tn-Tnset<-1, Tfg =18, Tfgset=Max (Tdpn+2, Tfg);

[0130] -2≤Tn-Tnset<-1.5, Tfg=19, Tfgset=Max (Tdpn+2, Tfg);

[0131] Tn-Tnset<-2, ​​shut down the radiation system, but Tfg =19 (assigned to control the closed loop).

[0132] Tfg is the target value for the radiant terminal water temperature (intermediate control variable), Tfgset is the setpoint for the radiant terminal water temperature (controlling the radiant water temperature), and Max is the maximum value calculation. Tfg is an intermediate control parameter used to generate the target values ​​for indoor absolute humidity (dns) and supply air absolute humidity (das). Even after the radiant system is shut down, dns and das still participate in subsequent control and therefore must be retained. However, Tfgset is used to control the mixing center or heat exchange center. When the radiant system is shut down, Tfgset no longer participates in control and therefore does not need to be retained.

[0133] b) Determine the target value of indoor absolute humidity (dns) based on the target value of radiant terminal water temperature (Tfg), i.e.:

[0134] Tfg=13, dns=9g / kg;

[0135] Tfg=14, dns=10g / kg;

[0136] Tfg=15, dns=10.5g / kg;

[0137] Tfg=16, dns=11.5g / kg;

[0138] Tfg=17, dns=12g / kg;

[0139] Tfg≥18, dns=13g / kg.

[0140] c) Determine the target value of absolute moisture content in the supply air, das, and the air volume based on the difference between the indoor absolute moisture content evaluation value dn and the indoor absolute moisture content target value dns, i.e.:

[0141] dn–dns≥1, das=dns-3, high air volume;

[0142] 0≤dn–dns<1, das=dns-2, high airflow;

[0143] -1≤dn–dns<0, das=dns-1, low airflow setting;

[0144] dn–dns<-1, das=dns, low airflow setting.

[0145] d) Determine the target control method for fresh air supply based on the outdoor absolute moisture content dw and the target value of the supply air absolute moisture content das, i.e.:

[0146] dw>das, the fresh air is controlled by the target value of the absolute moisture content of the supply air, das;

[0147] If dw≤das, the fresh air is controlled by the target value of supply air temperature Tas, where Tas=Tnset;

[0148] e) Determine the target value of the chiller / heat source unit's water supply temperature Twg based on the target value of the absolute moisture content of the supply air das or the target value of the supply air temperature Tas and the setpoint of the radiant terminal water temperature Tfgset, that is:

[0149] dw>das, Twg = Max [Min (das - 2, Tfgset - 1), 6];

[0150] dw≤das, Twg = Min(Tas - 7, Tfgset - 1); Min is the minimum value operation.

[0151] f) Increase preventative control measures – the sunshine mode, i.e.:

[0152] The triggering conditions must be met simultaneously for the following four conditions: ① The summer high temperature sub-mode is in operation; ② The indoor temperature evaluation value Tn ≥ the indoor temperature set value Tnset; ③ The total solar radiation irradiance ≥ 200W / ㎡; ④ It lasts for 10 minutes.

[0153] Control strategy: Set the target value of indoor absolute humidity dns to 9 g / kg (minimum value), and the set value of radiant terminal water temperature Tfgset to Max(Tdpn, 13) (minimum value); to increase dehumidification capacity and radiant terminal cooling capacity to cope with the increase in indoor heat load caused by solar radiation.

[0154] The cancellation condition is that any one of the following three conditions is met for 5 minutes: ① Summer high temperature sub-mode is cancelled; ② Indoor temperature evaluation value Tn < indoor temperature set value Tnset; ③ Total solar radiation illuminance < 200W / ㎡.

[0155] 2) Summer Medium Temperature Sub-mode Operation: Only the radiant system is turned off, and the fresh air system alone is responsible for indoor temperature control, abandoning precise humidity control. The control method is as follows:

[0156] a) Determine the target value of the fresh air supply temperature (Tag) and the air volume based on the difference between the indoor temperature evaluation value (Tn) and the indoor temperature setpoint (Tnset), i.e.:

[0157] Tn-Tnset≥1, Tag=14, high airflow;

[0158] 0≤Tn-Tnset<1, Tag=16, high airflow;

[0159] -1≤Tn-Tnset<0, Tag=18, low airflow setting;

[0160] -2≤Tn-Tnset<-1, Tag=20, low airflow setting;

[0161] Tn-Tnset<-2, ​​Tag=outdoor temperature, low airflow.

[0162] b) Determine the target value of the chiller / heat source unit's water supply temperature, Twg, based on the target value of the fresh air supply temperature, Tag.

[0163] Twg = Tag – 7;

[0164] When Tag = outdoor temperature, the heat source and cold source are turned off.

[0165] 3) The operating mode of the transitional season ventilation mode is as follows: the radiant system and heat pump system are turned off, and only the fresh air unit is operated. The air volume is automatically adjusted according to the difference between the indoor CO2 concentration evaluation value Cn and the indoor CO2 concentration set value Cnset. The ventilation control method is as follows:

[0166] Cn–Cnset≥0, high airflow rate;

[0167] Cn–Cnset < 0, low airflow setting.

[0168] 4) The operating mode of the winter low-temperature sub-mode is as follows: the radiant system undertakes the main heating task, and the fresh air system assists in temperature regulation. The control method is as follows:

[0169] a) Determine the target value Tfg of the radiant terminal water temperature based on the outdoor temperature Tw, i.e.:

[0170] Tw < 5, Tfg = 40;

[0171] 5≤Tw<10, Tfg=35;

[0172] 10≤Tw<15,Tfg=30.

[0173] b) Determine the radiant terminal water temperature setpoint Tfgset, the fresh air supply temperature target value Tag, and the air volume based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset, i.e.:

[0174] Tn-Tnset≤-1, Tfgset=Tfg+3, Tag=26, high airflow;

[0175] -1<Tn-Tnset≤0,Tfgset=Tfg+1,Tag=24,Airflow low setting;

[0176] 0 < Tn - Tnset ≤ 1, Tfgset = Tfg - 1, Tag = outdoor temperature, low airflow setting;

[0177] 1 < Tn - Tnset ≤ 2, Tfgset = Tfg - 3, Tag = outdoor temperature, low airflow setting;

[0178] Tn-Tnset > 2, turn off the radiation system, Tag = outdoor temperature, fan speed on high.

[0179] c) Determine the target value Twg of the chiller / heat source unit's water supply temperature based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset, i.e.:

[0180] When Tn-Tnset≤2, Twg=Max(Tfgset+1,Tag+7);

[0181] When Tn-Tnset>2, the hot and cold sources are turned off.

[0182] 5) The operating mode of the winter medium-temperature sub-mode is as follows: the radiant system is turned off, and only the fresh air system is responsible for indoor temperature control. The control method is as follows:

[0183] a) Determine the target value of the fresh air supply temperature (Tag) and the air volume based on the difference between the indoor temperature evaluation value (Tn) and the indoor temperature setpoint (Tnset), i.e.:

[0184] Tn-Tnset < -1, Tag = Tnset + 6, high airflow;

[0185] -1≤Tn-Tnset<-0.5, Tag=Tnset+4, high airflow;

[0186] -0.5≤Tn-Tnset<0, Tag=Tnset+2, high airflow;

[0187] 0≤Tn-Tnset<0.5, Tag=Tnset, low airflow setting;

[0188] 0.5≤Tn-Tnset<1, Tag=outdoor temperature, low airflow setting;

[0189] Tn-Tnset≥1, Tag=outdoor temperature, airflow high.

[0190] b) Determine the target value of the chiller / heat source unit's water supply temperature, Twg, based on the target value of the fresh air supply temperature, Tag.

[0191] Twg = Tag + 7;

[0192] When Tag = outdoor temperature, the heat source and cold source are turned off.

Claims

1. An automatic control method for variable air, water, and air quality variables in a five-balance system, wherein the five-balance system includes a radiant system, a fresh air system, a heat pump system, and a mixing center or heat exchange center, characterized in that, Includes the following steps: S1. Data perception and parameter evaluation; Outdoor temperature (Tw), outdoor absolute humidity (dw), total solar radiation, and indoor temperature, absolute humidity, dew point temperature, and CO2 concentration for each room were collected. The four sets of indoor data were then weighted and averaged to obtain the indoor temperature evaluation value (Tn), indoor absolute humidity evaluation value (dn), indoor dew point temperature evaluation value (Tdpn), and indoor CO2 concentration evaluation value (Cn). The formulas for the weighted average of the four sets of indoor data are as follows: in: —Evaluation values ​​for a certain indoor parameter, namely Tn, dn, Tdpn, and Cn; —The panel status of the i-th room, enabled. =1, turn off =0; —Measured value of a certain parameter in the i-th room; —Room number; —Total number of rooms; S2, Seasonal mode is automatically determined; The following main and sub-modes are automatically defined based on the outdoor temperature (Tw): 1) If Tw > 24℃, enter summer cooling mode; where Tw > 28℃ is high temperature sub-mode, and 24 < Tw ≤ 28℃ is medium temperature sub-mode; 2) If 18℃≤Tw≤24℃, enter the transitional season ventilation mode; 3) If Tw < 18℃, enter winter heating mode; where 15℃ ≤ Tw < 18℃ is the medium temperature sub-mode, and Tw < 15℃ is the low temperature sub-mode. S3. Automatically switch to the corresponding mode control method according to different seasonal modes; 1) The operating mode of the summer high-temperature sub-mode is: radiant cooling system and fresh air system dehumidification. The control method is as follows: a) The target value Tfg of the radiant terminal water temperature is determined based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset. The radiant terminal water temperature setpoint Tfgset is determined based on the target value Tfg of the radiant terminal water temperature and the indoor dew point temperature evaluation value Tdpn, i.e.: Tn-Tnset≥1, Tfg=13, Tfgset=Max (Tdpn, Tfg); 0.5≤Tn-Tnset<1, Tfg=14, Tfgset=Max(Tdpn,Tfg); 0≤Tn-Tnset<0.5, Tfg=15, Tfgset=Max(Tdpn,Tfg); -0.5≤Tn-Tnset<0, Tfg=16, Tfgset=Max(Tdpn+1,Tfg); -1≤Tn-Tnset<-0.5, Tfg=17, Tfgset=Max (Tdpn+1, Tfg); -1.5≤Tn-Tnset<-1, Tfg =18, Tfgset=Max (Tdpn+2, Tfg); -2≤Tn-Tnset<-1.5, Tfg=19, Tfgset=Max (Tdpn+2, Tfg); Tn-Tnset < -2, the radiation system is turned off, but Tfg = 19; b) Determine the target value of indoor absolute humidity (dns) based on the target value of radiant terminal water temperature (Tfg), i.e.: Tfg=13, dns=9g / kg; Tfg=14, dns=10g / kg; Tfg=15, dns=10.5g / kg; Tfg=16, dns=11.5g / kg; Tfg=17, dns=12g / kg; Tfg≥18, dns=13g / kg; c) Determine the target value of absolute moisture content in the supply air, das, and the air volume based on the difference between the indoor absolute moisture content evaluation value dn and the indoor absolute moisture content target value dns, i.e.: dn–dns≥1, das=dns-3, high air volume; 0≤dn–dns<1, das=dns-2, high airflow; -1≤dn–dns<0, das=dns-1, low airflow setting; dn–dns<-1, das=dns, low airflow setting; d) Determine the target control method for fresh air supply based on the outdoor absolute moisture content dw and the target value of the supply air absolute moisture content das, i.e.: dw>das, the fresh air is controlled by the target value of the absolute moisture content of the supply air, das; If dw≤das, the fresh air is controlled by the supply air target temperature Tas, where Tas=Tnset; e) Determine the target value of the chiller / heat source unit's water supply temperature Twg based on the target value of the absolute moisture content of the supply air das or the target temperature of the supply air Tas and the setpoint of the radiant terminal water temperature Tfgset, i.e.: dw>das, Twg = Max [Min (das - 2, Tfgset - 1), 6]; dw≤das, Twg = Min(Tas - 7, Tfgset - 1); f) Increase preventative control measures – the sunshine mode, i.e.: Triggering conditions: The following four conditions must be met simultaneously: ① Summer high temperature sub-mode is in operation; ② Indoor temperature evaluation value Tn ≥ Indoor temperature set value Tnset; ③ Total solar radiation irradiance ≥ 200W / ㎡; ④ Lasts for 10 minutes. Control strategy: Set the target value of indoor absolute humidity dns to 9 g / kg and the set value of radiant terminal water temperature Tfgset to Max(Tdpn, 13). The cancellation condition is that any one of the three conditions is met for 5 minutes: ① Summer high temperature sub-mode is cancelled; ② Indoor temperature evaluation value Tn < Indoor temperature set value Tnset; ③ Total solar radiation illuminance < 200W / ㎡; 2) Summer Medium Temperature Sub-mode Operation: Only the radiant system is turned off, and the fresh air system alone is responsible for indoor temperature control, abandoning precise humidity control. The control method is as follows: a) Determine the target value of the fresh air supply temperature (Tag) and the air volume based on the difference between the indoor temperature evaluation value (Tn) and the indoor temperature setpoint (Tnset), i.e.: Tn-Tnset≥1, Tag=14, high airflow; 0≤Tn-Tnset<1, Tag=16, high airflow; -1≤Tn-Tnset<0, Tag=18, low airflow setting; -2≤Tn-Tnset<-1, Tag=20, low airflow setting; Tn-Tnset < -2, Tag = outdoor temperature, low airflow setting; b) Determine the target value of the chiller / heat source unit's water supply temperature, Twg, based on the target value of the fresh air supply temperature, Tag. Twg = Tag – 7; When Tag = outdoor temperature, the heat source and cold source are turned off; 3) The operating mode of the transitional season ventilation mode is as follows: the radiant system and heat pump system are turned off, and only the fresh air unit is operated. The air volume is automatically adjusted according to the difference between the indoor CO2 concentration evaluation value Cn and the indoor CO2 concentration set value Cnset. The ventilation control method is as follows: Cn–Cnset≥0, high airflow rate; Cn–Cnset < 0, low airflow setting; 4) The operating mode of the winter low-temperature sub-mode is as follows: the radiant system undertakes the main heating task, and the fresh air system assists in temperature regulation. The control method is as follows: a) Determine the target value Tfg of the radiant terminal water temperature based on the outdoor temperature Tw, i.e.: Tw < 5, Tfg = 40; 5≤Tw<10, Tfg=35; 10≤Tw<15,Tfg=30; b) Determine the radiant terminal water temperature setpoint Tfgset, the fresh air supply temperature target value Tag, and the air volume based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset, i.e.: Tn-Tnset≤-1, Tfgset=Tfg+3, Tag=26, high airflow; -1<Tn-Tnset≤0,Tfgset=Tfg+1,Tag=24,Airflow low setting; 0 < Tn - Tnset ≤ 1, Tfgset = Tfg - 1, Tag = outdoor temperature, low airflow setting; 1 < Tn - Tnset ≤ 2, Tfgset = Tfg - 3, Tag = outdoor temperature, low airflow setting; Tn-Tnset > 2, turn off the radiant system, Tag = outdoor temperature, fan speed on high; c) Determine the target value Twg of the chiller / heat source unit's water supply temperature based on the difference between the indoor temperature evaluation value Tn and the indoor temperature setpoint Tnset, i.e.: When Tn-Tnset≤2, Twg=Max(Tfgset+1,Tag+7); When Tn-Tnset>2, the heat source and cold source are turned off; 5) The operating mode of the winter medium-temperature sub-mode is as follows: the radiant system is turned off, and only the fresh air system is responsible for indoor temperature control. The control method is as follows: a) Determine the target value of the fresh air supply temperature (Tag) and the air volume based on the difference between the indoor temperature evaluation value (Tn) and the indoor temperature setpoint (Tnset), i.e.: Tn-Tnset < -1, Tag = Tnset + 6, high airflow; -1≤Tn-Tnset<-0.5, Tag=Tnset+4, high airflow; -0.5≤Tn-Tnset<0, Tag=Tnset+2, high airflow; 0≤Tn-Tnset<0.5, Tag=Tnset, low airflow setting; 0.5≤Tn-Tnset<1, Tag=outdoor temperature, low airflow setting; Tn-Tnset≥1, Tag=outdoor temperature, airflow high; b) Determine the target value of the chiller / heat source unit's water supply temperature, Twg, based on the target value of the fresh air supply temperature, Tag. Twg = Tag + 7; When Tag = outdoor temperature, the heat source and cold source are turned off.

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