A method for adjusting the heat supply balance of the entire network based on room temperature imbalance rate

Abstract

The present invention discloses a whole-network heat supply balance adjustment method based on room temperature imbalance rate, which comprises the following steps: step S1: under the condition that the air tightness of the building remains unchanged and the thermal inertia of the building is not considered, the heat load of the heat exchange station is calculated according to the indoor temperature set value; step S2: according to the building type served by the heat exchange station, the room temperature actual value is obtained by reading, or according to the building type served by the heat exchange station and the heat load of the heat exchange station, the room temperature calculated value is obtained by calculating; step S3: according to the room temperature actual value or the room temperature calculated value, the single-network imbalance rate of the heat exchange station is calculated; step S4: when the single-network imbalance rate of the heat exchange station is ≠0, the primary flow rate or the primary return water temperature of the heat exchange station is adjusted; the present invention uses the room temperature imbalance rate as a standard for evaluating whether a certain heat exchange station is balanced; when predicting the load, the thermal index in the specification is corrected in combination with the actual situation to reduce the error; when the heat source output is insufficient, the initially set indoor temperature is corrected.

Description

Technical Field

[0001] The present invention belongs to the field of centralized heating regulation, and in particular relates to a method for regulating the heat supply balance of the entire network based on room temperature imbalance rate. Background Art

[0002] During the operation of centralized heating systems, various reasons often prevent the network's flow distribution from meeting user needs. This results in hydraulic imbalances in the pipe network, failure to meet user room temperature standards, increased user complaints, and increased energy consumption for heating companies. An unbalanced heating cycle is the natural enemy of energy conservation and safety. This imbalance in the heating network necessitates increased flow and heat supply, which in turn increases transmission power consumption, causing overheating near the heat source and undercooling far away, wasting energy. To achieve a balance between supply and demand in the heating system and uniform room temperatures for each user, the primary pipe network requires hydraulic balancing. Various methods are currently available, including flow-targeted, heat-targeted, and return water temperature-targeted.

[0003] In actual regulation, operators often independently adjust the heat exchange station and the secondary network based on experience, and the adjustment effect is not ideal. For some heating systems with many heat exchange stations and complex pipe networks, the original adjustment method is no longer applicable. The existing adjustment method based on room temperature as the evaluation standard does not take into account users who do not have room temperature measurement points installed and whose room temperature data cannot be obtained, as well as how to evaluate the system imbalance rate when the output of the heat source is less than the user's heat load demand; and the adjustment method is to adjust the water supply temperature, which is a single method. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate, so as to solve the problems of substandard user room temperature, hydraulic imbalance in a network and high energy consumption of heat exchange stations.

[0005] The present invention adopts the following technical solution: a method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate, which comprises the following steps:

[0006] Step S1: Under the condition that the building airtightness remains unchanged and the building thermal inertia is not considered, the heat load of the heat exchange station is calculated according to the indoor temperature setting value.

[0007] Step S2: Read the measured room temperature value according to the building type served by the heat exchange station, or calculate the calculated room temperature value according to the building type served by the heat exchange station and the heat load of the heat exchange station.

[0008] Step S3: Calculate the imbalance rate of a heat exchange station network based on the measured room temperature value or the calculated room temperature value.

[0009] Step S4: When the imbalance rate of a network of the heat exchange station is ≠0, the primary flow rate or the primary return water temperature of the heat exchange station is adjusted.

[0010] Furthermore, the heat load calculation formula of the heat exchange station in step S1 is:

[0011]

[0012] Where: Q h ——Heating load, kW; T nset ——Indoor temperature setting value, ℃; T w0 ——Outdoor design temperature for heating; T W ——actual outdoor temperature, °C; q——heat load index, W / m 2 ; A——heating area, m 2 .

[0013] Furthermore, in step S2, when the building type is a non-energy-saving building and the heating equipment used is a radiator, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0014]

[0015] Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

[0016] Furthermore, in step S2, when the building type is a non-energy-saving building and the heating equipment used is floor heating, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0017]

[0018] Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

[0019] Furthermore, in step S2, when the building type is an energy-saving building and the heating equipment used is a radiator, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0020]

[0021] In step S2, when the building type is an energy-saving building and the heating equipment used is floor heating, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0022]

[0023] Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

[0024] Furthermore, in step S3, when the predicted heat load is greater than or equal to the design value of the heat source output, the indoor temperature setting value is corrected to obtain a corrected room temperature setting value. The correction method is:

[0025] T nset1 =αT nset +(1-α)T w

[0026] Where: T nset1 ——Corrected room temperature setting value, ℃; T nset ——Indoor temperature setting value, ℃; T W ——actual outdoor temperature, °C; α——ratio of heat source output to user heat load;

[0027]

[0028] Where: H is the design value of heat source output, unit kW, ∑Q h It is the sum of the predicted heat loads of each heat exchange station.

[0029] Furthermore, the calculation formula for calculating the imbalance rate of a heat exchange station network according to the corrected room temperature set value and the calculated room temperature value is:

[0030]

[0031] Where: γ T ——Unbalance rate of one network; T n——Measured or calculated room temperature, °C; T w0 ——Calculated outdoor temperature for heating, ℃; T nset1 ——Correct the room temperature setting value, ℃;

[0032] Furthermore, in step S3, when the predicted heat load is less than the design value of the heat source output, the calculation formula for the single network imbalance rate of the heat exchange station is calculated based on the measured room temperature value and the indoor temperature set value:

[0033]

[0034] Where: γ T ——Unbalance rate of one network; T n ——Measured or calculated room temperature, °C; T w0 ——Calculated outdoor temperature for heating, ℃; T nset ——Indoor temperature setting value, ℃;

[0035] Furthermore, in step S4, the method for adjusting the primary return water temperature of the heat exchange station comprises the following steps:

[0036] Step S401: Calculate the target return water temperature. The calculation formula is:

[0037]

[0038] Where Q h ——heating load, kW; G1——current flow, t / h; t g1 ——primary water supply temperature, °C; α——ratio of heat source output to user heat load; t h1cal ——Target value of primary return water temperature, °C;

[0039] Step S402: Calculate the primary return water temperature imbalance rate using the following formula:

[0040]

[0041] Where, γ t1 ——Primary return water temperature imbalance rate; t h1 ——Current return water temperature, °C; t h1cal ——Target value of primary return water temperature, °C;

[0042] Step S403: When the primary return water temperature imbalance rate γ t1 When the value is greater than 15%, adjust the opening K of the primary network electric valve. The adjustment formula is as follows:

[0043]

[0044] Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric control valve.

[0045] Furthermore, in step S4, the method for regulating the primary flow of the heat exchange station comprises the following steps:

[0046] Step S401: Calculate the flow target value. The calculation formula is:

[0047]

[0048] Where Q h ——Heating heat load, kW; t g1 ——Current water supply temperature, ℃; t h1 ——Current primary return water temperature, °C; α——Ratio of heat source output to user heat load;

[0049] Step S402: Calculate the flow imbalance rate γ G , the calculation formula is as follows:

[0050]

[0051] Where, G1 is the current flow rate, t / h; G 1cal ——Flow target value; γ G ——Flow imbalance rate;

[0052] Step S403: When the flow imbalance rate γ G When the value is greater than 15%, adjust the opening K of the primary network electric valve. The adjustment formula is as follows:

[0053]

[0054] Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric regulating valve; G1 is the current flow rate, t / h; G 1cal ——Flow target value.

[0055] The beneficial effects of the present invention are: the present invention reasonably evaluates the imbalance rate method of the entire pipe network system; for users who have not installed room temperature measuring points and whose room temperature cannot be obtained, a method for calculating the room temperature of four types of users is proposed; for the situation of insufficient heat source, an optimized solution for network balance evaluation is proposed; for the primary flow and primary return water temperature regulation method, the relationship between the primary flow, primary return temperature and valve opening is derived, and a combination of coarse adjustment and PID fine adjustment is proposed; the present invention uses the room temperature imbalance rate as a standard for evaluating whether a heat exchange station is balanced; when predicting load, the thermal indicators in the specification are corrected in combination with actual conditions to reduce errors; when the heat source output is insufficient, the initially set indoor temperature is corrected; when the room temperature measuring point is not installed or the room temperature data cannot be obtained, the theoretical room temperature of different types of terminals of different types of buildings is calculated; the regulation method can adjust the valve opening according to the primary flow and primary return water temperature, and achieve it through coarse adjustment and PID fine adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0057] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Under the condition that the building airtightness remains unchanged and the building thermal inertia is not considered, the heating heat load Q h The temperature difference between indoor and outdoor (t n -t w ), according to the "Code for Design of Urban Heating Pipe Networks" (CJJ 34-2010), the recommended heat load indicators for the four types of buildings: residential, school, office, and commercial are shown in Table 1.

[0059] Table 1 Building heat load index (standard value) Unit: W / m 2

[0060] Building Type Residential School Office Business Heat load index (non-energy-saving buildings) 58 60 60 65 Heat load index (energy-saving building) 40 50 50 55

[0061] In actual operation, the heat load index of the building is lower than the value in the table. Taking Xi'an as an example, according to the "Code for Thermal Design of Civil Buildings" (GB 50176-2016), the heating degree days in Xi'an is HDD18=2178℃·d, and the corresponding T w =-2.4℃, thus, the equivalent full load operation time is 106.76d.

[0062] According to the Civil Building Energy Consumption Standard (GB / T 51161-2016), the energy consumption constraint for building heating is 0.21GJ / (m 2 a), the design heat load index is 22.8W / m 2According to the Design Code for Heating, Ventilation and Air Conditioning of Civil Buildings (GB50736-2012), the heating design value is T n =18℃, T w =-3.4℃, the converted heat load index is 23.9W / m 2 According to this calculation, the actual heat load index of the building is 60% of the value in Table 1-01. Therefore, the adopted value of the building heat load index is shown in Table 2.

[0063] Table 2 Building heat load index (adopted values) Unit: W / m 2

[0064] Building Type Residential School Office Business Heat load index (non-energy-saving buildings) 34.8 36 36 39 Heat load index (energy-saving building) 24 30 30 33

[0065] Based on the above content, buildings are divided into non-energy-saving building radiators, non-energy-saving building floor heating, energy-saving building radiators and energy-saving building floor heating.

[0066] Therefore, the present invention discloses a method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate, which comprises the following steps:

[0067] Step S1: Under the condition that the building airtightness remains unchanged and the building thermal inertia is not considered, the heat load of the heat exchange station is calculated according to the indoor temperature setting value.

[0068] Step S2: Read the measured room temperature value according to the building type served by the heat exchange station, or calculate the calculated room temperature value according to the building type served by the heat exchange station and the heat load of the heat exchange station.

[0069] Step S3: Calculate the imbalance rate of a heat exchange station network based on the measured room temperature value or the calculated room temperature value.

[0070] Step S4: When the imbalance rate of a network of the heat exchange station is ≠0, the primary flow rate or the primary return water temperature of the heat exchange station is adjusted.

[0071] The heat load calculation formula of the heat exchange station in step S1 is:

[0072]

[0073] Where: Q h ——Heating load, kW; T nset ——Indoor temperature setting value, ℃; T w0 ——Outdoor design temperature for heating; T W ——actual outdoor temperature, °C; q——heat load index, W / m 2 ; A——heating area, m 2 .

[0074] In step S2, when the building type is a non-energy-saving building and the heating equipment used is a radiator, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0075]

[0076] Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

[0077] In step S2, when the building type is a non-energy-saving building and the heating equipment used is floor heating, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0078]

[0079] Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

[0080] In step S2, when the building type is an energy-saving building and the heating equipment used is a radiator, the room temperature calculation value is calculated based on the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0081]

[0082] Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

[0083] In step S2, when the building type is an energy-saving building and the heating equipment used is floor heating, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows:

[0084]

[0085] Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

[0086] In step S3: when the predicted heat load is greater than or equal to the design value of the heat source output, the indoor temperature setting value is corrected to obtain a corrected room temperature setting value. The correction method is:

[0087] T nset1 =αT nset +(1-α)T w

[0088] Where: T nset1 ——Corrected room temperature setting value, ℃; T nset ——Indoor temperature setting value, ℃; T W ——actual outdoor temperature, °C; α——ratio of heat source output to user heat load;

[0089]

[0090] Where: H is the design value of heat source output, unit kW, ∑Q h It is the sum of the predicted heat loads of each heat exchange station.

[0091] The calculation formula for the imbalance rate of a heat exchange station network based on the corrected room temperature set value and the calculated room temperature value is:

[0092]

[0093] Where: γ T ——Unbalance rate of the network at room temperature; T n ——Measured or calculated value of room temperature, °C; T w0 ——Calculated outdoor temperature for heating, ℃; T nset1 ——Indoor temperature setting value, ℃.

[0094] In step S3, when the predicted heat load is less than the design value of the heat source output, the calculation formula for the single network imbalance rate of the heat exchange station is calculated based on the measured room temperature value and the indoor temperature set value:

[0095]

[0096] Where: γ T ——Unbalance rate of one network; T n ——Measured or calculated room temperature, °C; T w0 ——Calculated outdoor temperature for heating, ℃; T nset ——Indoor temperature setting value, ℃.

[0097] This formula quantifies the room temperature imbalance index, providing a more intuitive view of the room temperature at a particular heat exchange station and its deviation from the set indoor temperature. When the single-network imbalance ratio is 0, the system makes no adjustments, and the adjustment process ends. When the single-network imbalance ratio is not 0, the next step is taken.

[0098] In step S4, the method for adjusting the primary return water temperature of the heat exchange station comprises the following steps:

[0099] Step S401: Calculate the target return water temperature. The calculation formula is:

[0100]

[0101] Where Q h ——heating load, kW; G1——current flow, t / h; t g1 ——primary water supply temperature, °C; α——ratio of heat source output to user heat load; t h1cal ——Target value of primary return water temperature, °C;

[0102] Step S402: Calculate the primary return water temperature imbalance rate using the following formula:

[0103]

[0104] Where, γ t1 ——Primary return water temperature imbalance rate; t h1 ——Current return water temperature, °C; t h1cal ——Target value of primary return water temperature, °C;

[0105] Step S403: When the primary return water temperature imbalance rate γ t1 When the value is greater than 15%, adjust the opening K of the primary network electric valve. The adjustment formula is as follows:

[0106]

[0107] Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric control valve.

[0108] The method for regulating the primary flow of the heat exchange station in step S4 comprises the following steps:

[0109] Step S401: Calculate the flow target value. The calculation formula is:

[0110]

[0111] Where Q h ——Heating heat load, kW; t g1 ——Current water supply temperature, ℃; t h1 ——Current primary return water temperature, °C; α——Ratio of heat source output to user heat load;

[0112] Step S402: Calculate the flow imbalance rate γ G , the calculation formula is as follows:

[0113]

[0114] Where, G1 is the current flow rate, t / h; G 1cal ——Flow target value; γ G ——Flow imbalance rate;

[0115] Step S403: When the flow imbalance rate γ G When the value is greater than 15%, adjust the opening K of the primary network electric valve. The adjustment formula is as follows:

[0116]

[0117] Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric regulating valve; G1 is the current flow rate, t / h; G 1cal ——Flow target value.

[0118] Example 1

[0119] In step S3, when the predicted heat load is ≥ the design value of the heat source output, the indoor temperature set value is corrected to obtain a corrected room temperature set value. The indoor temperature set value is introduced and the actual thermal index after correction is used to make the predicted value more reasonable and closer to the actual value; the load prediction values ​​of all users are compared with the heat source output. If the heat source output is less than the load demand, the room temperature set value should be corrected.

[0120] Assuming that when the outdoor temperature is -1℃, the design value of the heat source output is 1000kW, and the user's predicted load is 1100kW, then The corrected room temperature setting value is:

[0121] T nset1 =0.909×20+(1-0.909)×(-1)=18.1℃.

[0122] Step S3 is to eliminate the situation where the room temperature of a large area of ​​users is lower than the original set value and fails to meet the standard when the heat source output is less than the user's predicted load, so as to make the evaluation result of the system imbalance rate more reasonable.

[0123] Example 2

[0124] Step S2 calculates the room temperature based on the building type. Based on the balance between the heat dissipation from the room to the outside and the heat dissipation from the radiator to the room, the relationship between the secondary network return water temperature and the indoor temperature is obtained:

[0125]

[0126] Where: t h ——Secondary network return water temperature, ℃; T w ——outdoor temperature, °C; K——parameter related to building insulation and sealing performance, °C; b——parameter related to radiator heat dissipation characteristics, °C; t g ——Secondary network water supply temperature, ℃; T n ——Calculated value of room temperature, °C; t g —Secondary network water supply temperature, °C. This formula is an iterative formula. The b value is related to the terminal form. The b value varies for different building types, so the b value of the terminal of different building types can be calculated. This formula is an iterative formula that establishes a functional relationship between indoor temperature and supply and return water temperature.

[0127] The following calculation method for indoor temperature is based on a non-energy-saving building with a radiator as the heating device:

[0128] The design heat load index of non-energy-saving buildings is generally 60W / m 2 To design, then:

[0129] 60A=K(18-T w0 ) (2)

[0130] Where: A——building area, m 2 ;T w0 ——Outdoor design temperature, ℃, then:

[0131]

[0132] Non-energy-saving radiator g =85℃、t h =60℃、T n=18℃, and then substitute into formula (1) to get the design adjustment formula of secondary network return water temperature:

[0133]

[0134] Thus we get:

[0135] b=0.5002ln(18-T w0 )-2.0240-0.2501lnA (5)

[0136] According to the design thermal index 60W / m 2 , substituting into formula (2) we get:

[0137]

[0138] If the actual thermal index is q s , W / m 2 ,and but:

[0139]

[0140] You can get:

[0141]

[0142] Under the condition of constant flow rate, the new design temperature difference is obtained:

[0143] t g -t h =0.4167q s (9)

[0144] Thus, we can solve for q s , W / m 2 Thermal indicators corresponding to the supply and return water temperatures and room temperature:

[0145] t h =t g -0.4167q s (10)

[0146]

[0147] Formula (11) simplifies the calculation relationship of indoor temperature into the relationship between indoor temperature and water supply temperature, actual heat load, and radiator coefficient. The actual heat load is a function of outdoor temperature, and the radiator coefficient is related to the area.

[0148] Example 3

[0149] Taking a non-energy-saving building as an example and the heating equipment used as floor heating, the calculation steps are the same as those in Example 2, and the following conclusions are obtained:

[0150] The calculation formula for the b value and indoor temperature of floor heating used in non-energy-saving buildings is as follows:

[0151] b=0.6068ln(18-T w0 )-2.2423-0.3034ln A (12)

[0152]

[0153] Example 4

[0154] Assuming that the building type is an energy-saving building and the heating equipment used is a radiator, the calculation steps are the same as those in Example 2, and the following conclusions are obtained:

[0155] The heating equipment used in energy-saving buildings is the radiator's b-value and indoor temperature calculation formula as follows:

[0156] b=0.5269ln(18-T w0 )-0.9719-0.2635lnA (14)

[0157]

[0158] Example 5

[0159] Assuming that the building type is an energy-saving building and the heating equipment used is floor heating, the calculation steps are the same as those in Example 2, and the following conclusions are obtained:

[0160] The calculation formula for the b value and indoor temperature of the floor heating equipment used in energy-saving buildings is as follows:

[0161] b=0.6068ln(18-T w0 )-2.2423-0.3034ln A (16)

[0162]

[0163] Example 6

[0164] When the imbalance rate of one network of the heat exchange station is ≠ 0, the primary flow of the building is adjusted. In step S4, the method for adjusting the primary flow of the heat exchange station is composed of the following steps:

[0165] Step S401: Calculate the flow target value. The calculation formula is:

[0166]

[0167] Where Q h ——Heating heat load, kW; t g1——Current water supply temperature, ℃; t h1 ——Current primary return water temperature, °C; α——Ratio of heat source output to user heat load;

[0168] Step S402: Calculate the flow imbalance rate γ G , the calculation formula is as follows:

[0169]

[0170] Where, G1 is the current flow rate, t / h; G 1cal ——Flow target value; γ G ——Flow imbalance rate;

[0171] Step S403: When the flow imbalance rate γ G When the value is greater than 15%, adjust the opening K of the primary network electric valve.

[0172] This is achieved by adjusting the valve opening: coarse adjustment is performed through opening calculation, and then fine adjustment is performed through PID. According to the control valve characteristic table, the relationship between the control valve pressure drop and the opening can be fitted.

[0173] ΔP v =cK d G 2 (20)

[0174] Where: ΔP v ——valve pressure drop; K——valve opening; G——flow through the valve; c, d——control valve characteristic fitting parameters; considering the pressure drop of the pipe section where the valve is located, the pressure drop characteristic of the valve network is:

[0175] ΔP=(cK d +S)G 2 (twenty one)

[0176] Where ΔP is the pressure drop of the pipe network containing the valve, and S is the impedance of the pipe network. During the valve adjustment process, the pressure fluctuation of the main pipe network is small, and the relationship between the opening and the flow rate is:

[0177]

[0178] Where K0 is the current opening and K is the target opening, thus obtaining:

[0179]

[0180] The last two terms on the right side of the above formula are close, so the opening adjustment formula of the control valve can be obtained:

[0181]

[0182] Among them, K0 is the current opening, K is the target opening, and for the primary network electric valve, the opening adjustment formula is:

[0183]

[0184] Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric regulating valve; G1 is the current flow rate, t / h; G 1cal ——Flow target value.

[0185] Example 7

[0186] The following is an example of a method for adjusting the primary return water temperature of a heat exchange station. The calculation steps are the same as those in Example 6. In step S4, the method for adjusting the primary return water temperature of the heat exchange station is composed of the following steps:

[0187] Step S401: Calculate the target return water temperature. The calculation formula is:

[0188]

[0189] Where Q h ——heating load, kW; G1——current flow, t / h; t g1 ——primary water supply temperature, °C; α——ratio of heat source output to user heat load; t h1cal ——Target value of primary return water temperature, °C;

[0190] Step S402: Calculate the primary return water temperature imbalance rate using the following formula:

[0191]

[0192] Where, γ t1 ——Primary return water temperature imbalance rate; t h1 ——Current return water temperature, °C; t h1cal ——Target value of primary return water temperature, °C;

[0193] Step S403: When the primary return water temperature imbalance rate γ t1 When the value is greater than 15%, adjust the opening K of the primary network electric valve. The adjustment formula is as follows:

[0194]

[0195] Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric control valve.

[0196] The present invention uses the room temperature imbalance rate as an evaluation standard, combines the single-network balancing adjustment with the room temperature of the heat exchange station and the user, and forms a regulation calculation method targeting user needs; load prediction is the basis of single-network balancing calculation, and the load prediction method in the present invention combines many years of actual data and specifications and standards to correct the heat load index; the present invention combines the characteristics of different types of buildings and different types of heating forms to derive room temperature calculation methods for four types of users; the single-network adjustment method in the present invention has a combination of coarse adjustment and PID fine adjustment based on the primary flow and primary return water temperature, and derives the functional relationship between the flow, return water temperature and valve opening.

[0197] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate, characterized in that: It consists of the following steps: Step S1: Under the condition that the building airtightness remains unchanged and the building thermal inertia is not considered, the heat load of the heat exchange station is calculated according to the indoor temperature setting value. Step S2: Read the measured room temperature value according to the building type served by the heat exchange station, or calculate the calculated room temperature value according to the building type served by the heat exchange station and the heat load of the heat exchange station. Step S3: Calculate the imbalance rate of a heat exchange station network based on the measured room temperature value or the calculated room temperature value. Step S4: When the imbalance rate of a network of the heat exchange station is ≠0, the primary flow rate or the primary return water temperature of the heat exchange station is adjusted; The heat load calculation formula of the heat exchange station in step S1 is: Where: Q h ——Heating load, kW; T nset ——Indoor temperature setting value, ℃; T w0 ——Outdoor design temperature for heating; T W ——actual outdoor temperature, °C; q——heat load index, W / m 2 ; A——heating area, m 2 ; In step S3, when the predicted heat load is greater than or equal to the design value of the heat source output, the indoor temperature setting value is corrected to obtain a corrected room temperature setting value. The correction method is: T nset1 =αT nset +(1-α)T w Where: T nset1 ——Corrected room temperature setting value, ℃; T nset ——Indoor temperature setting value, ℃; T W ——actual outdoor temperature, °C; α——ratio of heat source output to user heat load; Where: H is the design value of heat source output, unit kW, ∑Q h The sum of the heat loads predicted for each heat exchange station; The calculation formula for the single network imbalance rate of the heat exchange station based on the corrected room temperature set value and the calculated room temperature value is: Where: γ T ——Unbalance rate of one network; T n ——Measured or calculated room temperature, °C; T w0 ——Calculated outdoor temperature for heating, ℃; T nset1 ——Correct the room temperature setting value, ℃.

2. The method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate according to claim 1, characterized in that: In step S2, when the building type is a non-energy-saving building and the heating equipment used is a radiator, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows: Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

3. The method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate according to claim 1, characterized in that: In step S2, when the building type is a non-energy-saving building and the heating equipment used is floor heating, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows: Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

4. The method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate according to claim 1, characterized in that: In step S2, when the building type is an energy-saving building and the heating equipment used is a radiator, the room temperature calculation value is calculated based on the building type served by the heat exchange station and the heat load of the heat exchange station as follows: In step S2, when the building type is an energy-saving building and the heating equipment used is floor heating, the room temperature calculation value is calculated according to the building type served by the heat exchange station and the heat load of the heat exchange station as follows: Where: T n ——Calculated value of room temperature, °C; t g ——Secondary network water supply temperature, °C; q s ——Actual heat load index, W / m 2 ; b - Parameters related to the heat dissipation characteristics of the radiator; Q h ——heating load, kW; A——heating area, m 2 .

5. A method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate according to claim 1 or 2, characterized in that: In step S3, when the predicted heat load is less than the design value of the heat source output, the calculation formula for the single network imbalance rate of the heat exchange station is calculated based on the measured room temperature value and the indoor temperature set value: Where: γ T ——Unbalance rate of one network; T n ——Measured or calculated room temperature, °C; T w0 ——Calculated outdoor temperature for heating, ℃; T nset ——Indoor temperature setting value, ℃.

6. The method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate according to claim 5, characterized in that: In step S4, the method for adjusting the primary return water temperature of the heat exchange station comprises the following steps: Step S401: Calculate the target return water temperature. The calculation formula is: Where Q h ——heating load, kW; G1——current flow, t / h; t g1 ——primary water supply temperature, °C; α——ratio of heat source output to user heat load; t h1cal ——Target value of primary return water temperature, °C; Step S402: Calculate the primary return water temperature imbalance rate using the following formula: Where, γ t1 ——Primary return water temperature imbalance rate; t h1 ——Current return water temperature, °C; t h1cal ——Target value of primary return water temperature, °C; Step S403: When the primary return water temperature imbalance rate γ t1 When the value is greater than 15%, adjust the opening K of the primary network electric valve. The adjustment formula is as follows: Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric control valve.

7. The method for adjusting the heat supply balance of the entire network based on the room temperature imbalance rate according to claim 6, characterized in that: The method for regulating the primary flow of the heat exchange station in step S4 comprises the following steps: Step S401: Calculate the flow target value. The calculation formula is: Where Q h ——Heating load, kW; t g1 ——Current water supply temperature, °C; t h1 ——Current primary return water temperature, °C; α——Ratio of heat source output to user heat load; Step S402: Calculate the flow imbalance rate γ G , the calculation formula is as follows: Where, G1 is the current flow rate, t / h; G 1cal ——Flow target value; γ G ——Flow imbalance rate; Step S403: When the flow imbalance rate γ G When the value is greater than 15%, adjust the opening K of the primary network electric valve. The adjustment formula is as follows: Where: K0 is the current opening, K is the target opening; d is the fitting curve coefficient of the electric regulating valve; G1 is the current flow rate, t / h; G 1cal ——Flow target value.

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