Building energy system operation evaluation method based on matching and sensitivity coupling

Abstract

The present invention relates to a building energy system operation evaluation method based on matching and sensitivity coupling, which comprises: 1. For the centralized air-conditioning system in the building to be analyzed, the air-conditioning terminal to be analyzed and evaluated is selected. 2. An air-conditioning system operation matching evaluation model and a system mismatch coefficient function expression are established. 3. The air-conditioning system operation matching index is defined and a matching function expression is constructed. 4. A matching grading standard is established to delineate the matching evaluation grading area of ​​the air-conditioning system terminal operation. 5. An air-conditioning system operation sensitivity analysis model is established. 6. A sensitivity index is defined and a sensitivity function expression is constructed. 7. A sensitivity grading standard is established to delineate the air-conditioning system terminal operation sensitivity grading area. 8. The air-conditioning terminal system operation parameters are obtained, the air-conditioning system operation matching and sensitivity are calculated, and the air-conditioning system operation performance is comprehensively evaluated according to the matching and sensitivity grading standards.

Description

Technical Field

[0001] The present invention belongs to the technical field of building energy system operation, and in particular relates to a building energy system operation evaluation method based on matching and sensitivity coupling. Background Art

[0002] In modern building environments, building energy air conditioning systems are key facilities to ensure indoor environmental quality, and their energy consumption issues are becoming increasingly prominent. According to statistics, the energy consumed by air conditioning systems accounts for 40% to 60% of the total energy consumption of buildings, especially for large public buildings or during high temperatures in summer, this proportion may be higher. Although measures such as the use of high-efficiency refrigeration equipment, optimization of system design, and introduction of intelligent control strategies have been taken in recent years to reduce energy consumption, many air conditioning systems still have large energy efficiency losses during actual use due to the particularity of building design, unreasonable system configuration, improper operation and management, etc. The main problems include but are not limited to: the poor matching between system components leads to low overall efficiency; lack of in-depth understanding of the system response characteristics under different working conditions; and the difficulty of existing evaluation methods to fully and accurately reflect the actual operating status of the system.

[0003] Therefore, how to provide a building energy system operation evaluation method based on matching and sensitivity coupling is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In order to solve the problem that the existing evaluation methods for building energy system operation are difficult to fully and accurately reflect the performance characteristics of the air-conditioning system under dynamic operating conditions, the interaction between the operating parameters of the air-conditioning system and the actual response characteristics under different working conditions are comprehensively considered to achieve a comprehensive evaluation of the operating performance of the air-conditioning system. The present invention provides a building energy system operation evaluation method based on matching and sensitivity coupling.

[0005] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0006] The building energy system operation evaluation method based on matching and sensitivity coupling includes the following steps:

[0007] Step S1: for the centralized air conditioning system in the building to be analyzed, select the air conditioning terminal to be analyzed and evaluated;

[0008] Step S2, establishing an air conditioning system operation matching evaluation model and a system mismatch coefficient function expression, wherein the air conditioning system operation matching evaluation model includes the fire accumulation loss, heat transfer resistance, and the inlet and outlet temperatures of the cold and hot fluids at the air conditioning terminal involved in the operation of the air conditioning system, and establishing a correlation between the air conditioning system operation parameters. The fire accumulation loss calculation formula is:

[0009] , where △ J loss is the fire loss, in units of ; Q is the heat transfer of the heat exchanger, in kW; T h,in is the thermodynamic temperature of the hot fluid inlet of the heat exchange coil, in K; T h,out is the thermodynamic temperature of the hot fluid outlet of the heat exchange coil, in K; T c,in is the thermodynamic temperature of the cold fluid inlet of the heat exchange coil, in K; T c,out is the thermodynamic temperature of the cold fluid outlet of the heat exchange coil, in K;

[0010] The thermal resistance calculation formula of the heat transfer process of the hot and cold fluids in the heat exchange coil is:

[0011] ;

[0012] in, c h is the specific heat capacity of the heat fluid in the heat exchange coil, in J / ( ); is the mass flow rate of the thermal fluid in the heat exchange coil, in kg / s; e is the heat transfer efficiency of the air conditioner terminal coil, and the unit is dimensionless;

[0013] Step S3: define the air conditioning system operation matching index and construct a matching function expression to define the air conditioning system operation matching index. f The function expression is:

[0014] ;

[0015] Step S4: Establish matching degree grading standards and define matching degree evaluation grading areas for air-conditioning system terminal operation;

[0016] Step S5: Establish an air conditioning system operation sensitivity analysis model, and the air conditioning terminal water flow is expressed as dimensionless relative water volume:

[0017] ,

[0018] in, is the dimensionless relative water volume at the air conditioning terminal; The running water volume of the air conditioner terminal, in kg / s; The rated water volume at the air conditioner terminal, in kg / s;

[0019] Step S6: Define the sensitivity index and construct the sensitivity function expression to define the operating sensitivity of the air conditioning system. x The function expression is:

[0020] ;

[0021] Step S7: Establish a sensitivity classification standard and define the terminal operation sensitivity classification area of ​​the air conditioning system;

[0022] Step S8, obtain the operating parameters of the air conditioning terminal system, including the water side flow rate of the air conditioning terminal, the air side flow rate, the water side inlet and outlet water temperature of the air conditioning terminal, and the air side inlet and outlet air temperature of the air conditioning terminal, and calculate the logarithmic mean temperature difference of the heat exchange at the system terminal △ T m and the product of the heat transfer coefficient and the area KF ; Calculate the operation matching and sensitivity of the air conditioning system, and conduct a comprehensive evaluation of the operation performance of the air conditioning system according to the matching and sensitivity classification standards;

[0023] Among them, the logarithmic mean temperature difference of the heat exchange at the end of the air conditioning system △ T m The expression is:

[0024] ,

[0025] The product of heat transfer coefficient and area KF The calculation expression is:

[0026] .

[0027] Furthermore, in step S1, the centralized air-conditioning system in the building includes fan coil units, a fresh air system, and a full air system, and the air-conditioning terminal includes a fan coil unit FCU and an air handling unit AHU in the air-conditioning system.

[0028] Furthermore, in step S2, the heat exchange efficiency ε of the air conditioner terminal coil satisfies:

[0029] ;

[0030] According to the heat transfer principle, the fluids on both sides of the heat exchange coil at the end of the air conditioning system satisfy the thermal balance equation:

[0031] ,

[0032] in, c c is the specific heat capacity of the cold fluid in the heat exchange coil, in J / ( ); is the mass flow rate of cold fluid in the heat exchange coil, in kg / s.

[0033] Furthermore, in step S2, according to the heat exchange efficiency formula and the heat balance formula, the following is obtained:

[0034] .

[0035] Furthermore, in step S2, according to the heat transfer principle, when the heat transfer coefficient of the air conditioner terminal heat exchanger is known K Heat exchange area F When , the temperature of the cold and hot fluids satisfies the following formula:

[0036] .

[0037] Furthermore, in step S2, the thermal resistance of the heat transfer process of the hot and cold fluids in the heat exchange coil is expressed in the following form:

[0038] ,

[0039] in, R h is the thermal resistance of the heat transfer process of the hot and cold fluids in the heat exchange coil, K / W; P is the mismatch coefficient; K is the heat transfer coefficient, unit is W / ( ); F is the heat transfer area of ​​the heat exchange coil, in m 2 , the mismatch coefficient P The expression is:

[0040] ,

[0041] Among them, μ is expressed as:

[0042] .

[0043] Furthermore, in the step S4, according to the heat exchange and inlet and outlet water temperatures of the air-conditioning terminal under different air volume gears and different inlet water flow conditions, the operation matching degree of the air-conditioning system terminal corresponding to the air volume gear and the inlet water flow condition is calculated, and the matching degree determined by the high-grade air volume, rated water volume, and relative water volume of 1 is used as the first dividing line; the matching degree determined by the high-grade air volume and relative water volume of 1.5 is used as the second dividing line; the matching degree determined by the low-grade air volume, 50% of the high-grade air volume, and the relative water volume of 1.5 is used as the third dividing line, and a matching degree grading standard is established accordingly, with the matching degree 1 and the first dividing line, the matching degree f The first area is 0.89; the first dividing line and the second dividing line have a matching degree f The second dividing line and the third dividing line have a matching degree of 0.82, forming the second area. fThe third area is 0.78, which constitutes the third area; the third dividing line and the matching degree 0 constitute the fourth area; the air conditioning system terminal operation matching degree evaluation grading area is: excellent: the first area is 0.89 < f ≤1, good: Region II, i.e. 0.82< f ≤0.89, general: Region III, i.e. 0.78< f ≤0.82, difference: Region IV, i.e. 0< f ≤0.78.

[0044] Furthermore, in step S5, the air conditioning system operation sensitivity analysis model includes the correlation between the key operating parameters of the air conditioning system established by the air conditioning terminal heat exchange, air conditioning terminal water flow, air conditioning terminal air volume, and inlet and outlet temperatures of the cold and hot fluids at the air conditioning terminal involved in the operation of the air conditioning system, and quantifies the law and degree of mutual change of parameters. For the terminal of the air conditioning system, the two sides of the terminal heat exchange coil are water and air respectively. During the heat exchange process of the fluids on both sides of the coil, the air conditioning terminal heat exchange is expressed as a dimensionless relative heat exchange as follows:

[0045] ,

[0046] in, is the dimensionless relative heat exchange at the air conditioning terminal; The rated heat exchange of the air conditioner terminal, in kW;

[0047] The water flow at the air conditioner terminal is expressed as dimensionless relative water volume:

[0048] ,

[0049] in, is the dimensionless relative water volume at the air conditioning terminal; The running water volume of the air conditioner terminal, in kg / s; The rated water volume at the air conditioner terminal, in kg / s;

[0050] The air volume at the air conditioning terminal is expressed as dimensionless relative air volume:

[0051] ,

[0052] in, is the dimensionless relative air volume at the air conditioning terminal; The water volume of the air conditioner terminal, in m 3 / h; The rated air volume of the air conditioner terminal, in m 3 / h.

[0053] Furthermore, in the step S7, according to the heat exchange amount and the inlet and outlet water temperature of the air-conditioning terminal under different air volume gears and different inlet water flow conditions, the operation sensitivity of the air-conditioning system terminal corresponding to the air volume gear and the inlet water flow condition is calculated; the sensitivity determined by the high-grade air volume relative air volume of 1 and the rated water volume relative water volume of 1 is used as the first dividing line; the sensitivity determined by the low-grade air volume relative air volume of 0.5 and the rated water volume relative water volume of 1 is used as the second dividing line, and the sensitivity grading standard is established accordingly, with the sensitivity higher than the first dividing line, and the sensitivity lower than the first dividing line. x The sensitivity zone is 0.5, which is the first zone. The sensitivity zone is the first and second dividing lines. x is 0.2, constituting the second area, i.e. the transition area; with the sensitivity lower than the second dividing line, the sensitivity x 0.2 constitutes the third area, i.e., the non-sensitive area; the terminal operation sensitivity evaluation classification areas of the air-conditioning system are: sensitive area: the first area, x ≥0.5, Transition zone: Region II 0.2< x <0.5, Non-sensitive area: Area III x ≤0.2.

[0054] Furthermore, in step S7, according to the matching degree in step S3, f The function expression of the air conditioning system operation matching degree is calculated according to the sensitivity in step S6. x The operating sensitivity of the air-conditioning system is calculated by using a function expression; and the operating performance of the air-conditioning system is comprehensively evaluated according to the matching degree grading standard and the sensitivity grading standard described in step S4 and step S7.

[0055] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0056] 1. The present invention provides a building energy system operation evaluation method based on the coupling of matching and sensitivity. By establishing an operation matching evaluation model and a sensitivity analysis model, the operation status of the air-conditioning system is comprehensively evaluated from multiple perspectives, accurately reflecting the interaction between the various parts of the air-conditioning system and its impact on the overall performance. The matching degree and sensitivity between the internal operating parameters of the system are coupled and analyzed, providing a comprehensive air-conditioning terminal operation performance evaluation framework.

[0057] 2. The building energy system operation evaluation method based on matching and sensitivity coupling proposed in this invention defines the matching and sensitivity indicators of air conditioning system operation, and constructs the corresponding function expression to make the evaluation result more specific and accurate. The quantitative evaluation index method helps to quickly locate the problem and provide a clear direction for subsequent improvements.

[0058] 3. The building energy system operation evaluation method based on the coupling of matching and sensitivity proposed in the present invention divides the evaluation results into different levels by establishing a grading standard for matching and sensitivity. This not only helps to distinguish the pros and cons of the system, but also guides users or managers to take appropriate measures for optimization and adjustment according to specific circumstances.

[0059] 4. The building energy system operation evaluation method based on the coupling of matching and sensitivity proposed in the present invention can timely discover and solve problems such as mismatch and inadaptability of system operation parameters through coupling analysis and evaluation of the matching and sensitivity of air-conditioning system operation, formulate adjustment and optimization measures, effectively improve the health and energy efficiency of air-conditioning system operation, achieve the purpose of energy conservation and emission reduction, and effectively reduce the operating costs of public buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a flow chart of a building energy system operation evaluation method based on matching and sensitivity coupling according to an embodiment of the present invention;

[0061] Figure 2 The relationship between the relative heat exchange and the relative water volume at different air volumes at the air-conditioning terminal in the building energy system operation evaluation method based on matching and sensitivity coupling in one embodiment of the present invention;

[0062] Figure 3 The matching degree classification standard and regional boundaries of the air conditioning system in the building energy system operation evaluation method based on matching and sensitivity coupling according to an embodiment of the present invention;

[0063] Figure 4 The sensitivity classification standard and regional boundaries of the air conditioning system in the building energy system operation evaluation method based on matching and sensitivity coupling according to an embodiment of the present invention;

[0064] Figure 5 The present invention provides an example of analysis and evaluation of the matching and sensitivity coupling of the operating conditions of an air-conditioning system in a building energy system operation evaluation method based on matching and sensitivity coupling according to an embodiment of the present invention. DETAILED DESCRIPTION

[0065] The following is a further detailed description of the building energy system operation evaluation method based on matching and sensitivity coupling provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description.

[0066] Embodiment 1

[0067] Combine the following Figure 1 to Figure 5 , a building energy system operation evaluation method based on matching and sensitivity coupling of the present invention is described in detail.

[0068] Building energy system operation assessment method based on matching and sensitivity coupling, such as Figure 1 As shown, the method mainly comprises the following steps:

[0069] Step S1: For the centralized air-conditioning system in the building to be analyzed, select the air-conditioning terminal to be analyzed and evaluated.

[0070] In step S1, the centralized air-conditioning system in the building mainly refers to the fan coil unit + fresh air system and the full air system, and the air-conditioning terminal mainly refers to the fan coil unit FCU and the air handling unit AHU in the air-conditioning system.

[0071] Step S2: Establish an air conditioning system operation matching evaluation model and a system mismatch coefficient function expression.

[0072] In step S2, the air conditioning system operation matching evaluation model includes the correlation between the air conditioning system operation parameters involved in the air conditioning system operation process based on the fire accumulation loss, heat transfer resistance, and the inlet and outlet temperatures of the cold and hot fluids at the air conditioning terminal. For the air conditioning system terminal, the two sides of the terminal heat exchange coil are water and air respectively. During the heat exchange process of the fluids on both sides of the coil, the fire accumulation loss can be expressed as: ;

[0073] Among them, △ J loss is the fire loss, in units of ; Q is the heat transfer of the heat exchanger, in kW; T h,in , T h,out is the inlet and outlet thermodynamic temperature of the heat fluid in the heat exchange coil, in K; T c,in , T c,out are the inlet and outlet thermodynamic temperatures of the cold fluid in the heat exchange coil, respectively, in K.

[0074] In step S2, the thermal resistance of the heat transfer process of the hot and cold fluids in the heat exchange coil can be expressed as:

[0075] ;

[0076] in, c h is the specific heat capacity of the heat fluid in the heat exchange coil, in J / ( ); is the mass flow rate of the heat fluid in the heat exchange coil, in kg / s; ε is the heat exchange efficiency of the air conditioner terminal coil.

[0077] In step S2, the heat exchange efficiency ε of the air conditioner terminal coil satisfies:

[0078] ;

[0079] In step S2, according to the heat transfer principle, the fluids on both sides of the heat exchange coil at the end of the air conditioning system satisfy the thermal balance equation:

[0080] ;

[0081] in, c c is the specific heat capacity of the cold fluid in the heat exchange coil, in J / ( ); is the mass flow rate of cold fluid in the heat exchange coil, in kg / s;

[0082] In step S2, according to the heat exchange efficiency formula and the heat balance formula, the following is obtained:

[0083] ;

[0084] In step S2, according to the heat transfer principle, when the heat transfer coefficient of the air conditioner terminal heat exchanger is known K Heat exchange area F When , the temperature of the cold and hot fluids satisfies the following formula:

[0085] ;

[0086] In step S2, the thermal resistance of the heat transfer process of the hot and cold fluids in the heat exchange coil can be expressed in the following form:

[0087] ;

[0088] in, R h It is the thermal resistance of the heat transfer process of the hot and cold fluids in the heat exchange coil, in K / W; P is the mismatch coefficient; K is the heat transfer coefficient, unit is W / ( ); F is the heat transfer area of ​​the heat exchange coil, in m 2 .

[0089] In step S2, the mismatch coefficient P The expression is:

[0090] ;

[0091] in, m The expression is:

[0092] ;

[0093] Step S3: define the air conditioning system operation matching index and construct a matching function expression.

[0094] In step S3, the air conditioning system operation matching degree is defined f The function expression is:

[0095] ;

[0096] Step S4: Establish a matching degree grading standard and define a matching degree evaluation grading area for the terminal operation of the air-conditioning system.

[0097] In step S4, the operation matching degree of the air conditioning system terminal corresponding to the air volume gear and the water inlet flow rate is calculated according to the heat exchange and the inlet and outlet water temperature of the air conditioning terminal under different air volume gears and different water inlet flow rates. The matching degree determined by the high-end air volume and the rated water volume (relative water volume is 1) is the first dividing line; the matching degree determined by the high-end air volume and the relative water volume of 1.5 is the second dividing line; the matching degree determined by the low-end air volume (50% of the high-end air volume) and the relative water volume of 1.5 is the third dividing line. Based on this, a matching degree grading standard is established, with the matching degree 1 and the first dividing line (matching degree 1). f is 0.89) constitutes the first area; the first dividing line and the second dividing line (matching degree f is 0.82) constitutes the second area; the second dividing line and the third dividing line (matching degree f The third dividing line and the matching degree 0 constitute the third area. The air conditioning system terminal operation matching evaluation grading area is: Excellent: Region I (0.89 < f ≤1), good: area II (0.82<φ≤0.89), general: area III (0.78< f ≤0.82), poor: Region IV (0< f ≤0.78).

[0098] Step S5: Establish an air conditioning system operation sensitivity analysis model.

[0099] In step S5, the air-conditioning system operation sensitivity analysis model includes the correlation between key operating parameters of the air-conditioning system established by the air-conditioning terminal heat exchange capacity, air-conditioning terminal water flow, air-conditioning terminal air volume, inlet and outlet temperatures of hot and cold fluids at the air-conditioning terminal involved in the operation of the air-conditioning system, and quantifies the law and degree of mutual change of parameters.

[0100] For the terminal of the air conditioning system, the two sides of the terminal heat exchange coil are water and air respectively. During the heat exchange process of the fluids on both sides of the coil, the heat exchange amount of the air conditioning terminal is expressed as a dimensionless relative heat exchange amount:

[0101] ;

[0102] in, is the dimensionless relative heat exchange at the air conditioning terminal; It is the rated heat exchange capacity of the air conditioner terminal, in kW.

[0103] In step S5, the water flow rate at the air conditioner terminal is expressed as dimensionless relative water volume:

[0104] ;

[0105] in, is the dimensionless relative water volume at the air conditioning terminal; The running water volume of the air conditioner terminal, in kg / s; It is the rated water volume at the air conditioner terminal, in kg / s.

[0106] In step S5, the air volume at the air conditioner terminal is expressed as dimensionless relative air volume:

[0107] ;

[0108] in, is the dimensionless relative air volume at the air conditioning terminal; The water volume of the air conditioner terminal, in m 3 / h; The rated air volume of the air conditioner terminal, in m 3 / h.

[0109] Step S6 defines the sensitivity index and constructs a sensitivity function expression.

[0110] In step S6, the air conditioning system operation sensitivity is defined x The function expression is:

[0111] ;

[0112] Step S7: Establish a sensitivity classification standard and define the air-conditioning system terminal operation sensitivity classification area.

[0113] In step S7, the heat exchange amount and inlet and outlet water temperature of the air conditioner terminal under different air volume levels and different inlet water flow conditions are used to calculate the operating sensitivity of the air conditioner terminal under the air volume level and inlet water flow conditions. The sensitivity determined by the high air volume (relative air volume is 1) and the rated water volume (relative water volume is 1) is used as the first dividing line; the sensitivity determined by the low air volume (relative air volume is 0.5) and the rated water volume (relative water volume is 1) is used as the second dividing line. Based on this, a sensitivity classification standard is established, with the sensitivity higher than the first dividing line (sensitivity xis 0.5) constitutes the first area (sensitive area); the first dividing line and the second dividing line (sensitivity x The sensitivity is lower than the second dividing line (sensitivity x is 0.2) constitutes the third area (non-sensitive area). The air conditioning system terminal operation sensitivity evaluation classification area is: Sensitive area: the first area ( x ≥0.5), transition zone: Region II (0.2< x <0.5)、Non-sensitive area: Region III ( x ≤0.2).

[0114] Step S8, obtain the operating parameters of the air conditioning terminal system, including the air conditioning terminal water side flow, air side flow, air conditioning terminal water side inlet and outlet water temperature, air conditioning terminal air side inlet and outlet air temperature. Calculate the system terminal heat exchange logarithmic mean temperature difference △ T m and the product of the heat transfer coefficient and the area KF . Calculate the operation matching and sensitivity of the air-conditioning system, and conduct a comprehensive evaluation of the operation performance of the air-conditioning system according to the matching and sensitivity classification standards.

[0115] In step S8, the logarithmic mean temperature difference of the heat exchange at the end of the air conditioning system Δ T m The expression is as follows:

[0116] ;

[0117] The product of the heat transfer coefficient and the area KF The calculation expression is as follows:

[0118] ;

[0119] Further, the air conditioning system operation matching degree is calculated according to the function expression of the matching degree φ in step S3, and the sensitivity in step S6 x The operating sensitivity of the air conditioning system is calculated by using the function expression of . And the operating performance of the air conditioning system is comprehensively evaluated according to the matching degree grading standard and the sensitivity grading standard described in step S4 and step S7.

[0120] The effects of the present invention are further described below in conjunction with specific embodiments.

[0121] Embodiment 2

[0122] refer to Figure 1, based on the matching and sensitivity coupling analysis, the operating performance of the building air conditioning system is evaluated. According to the steps S1 to S8, the matching and sensitivity coupling analysis and evaluation of the air conditioning terminal operating parameters can be performed. Table 1 shows the parameters of the water side and the wind side of a series of different models of fan coil units designed by a manufacturer under rated conditions and the matching degree of the system under rated conditions.

[0123] Table 1 Rated working condition matching degree of air conditioner terminal

[0124]

[0125] For the 03 model fan coil terminal in Table 1, the heat exchange curves under different air volumes and water volumes are as follows: Figure 2 As shown. Figure 2 According to step S8, the operation matching degree of each operating point can be calculated respectively. According to step S4, the air conditioning system terminal operation matching degree evaluation classification area is delineated as follows: Figure 3 The air conditioning system terminal operation matching evaluation grading area is: Excellent: Area I (0.89 < f ≤1), good: Region II (0.82< f ≤0.89), general: Region III (0.78< f ≤0.82), poor: Region IV (0< f ≤0.78).

[0126] for Figure 2 According to step S8, the operating sensitivity of each operating point can be calculated respectively. According to step S7, the air conditioning system terminal operating sensitivity evaluation classification area is delineated as follows: Figure 4 The air conditioning system terminal operation sensitivity evaluation classification areas are as follows: Sensitive area: Area I ( x ≥0.5), transition zone: Region II (0.2< x <0.5)、Non-sensitive area: Region III ( x ≤0.2).

[0127] Figure 5As an application example of the method steps according to the present invention, the matching degree corresponding to the operating point A or A' (high-end air volume / relative water volume 0.8) is 0.92, which belongs to the excellent matching performance area; the corresponding sensitivity is 0.61, which belongs to the sensitive area, indicating that the water volume at the air conditioner terminal changes by 10%, and the heat exchange at the air conditioner terminal changes by 6.1%. The matching degree corresponding to the operating point B or B' (mid-range air volume / relative water volume 0.9) is 0.88, which belongs to the good matching performance area; the corresponding sensitivity is 0.39, which belongs to the sensitive transition area, indicating that the water volume at the air conditioner terminal changes by 10%, and the heat exchange at the air conditioner terminal changes by 3.9%. The matching degree corresponding to C or C' (low-end air volume / relative water volume 1.3) is 0.8, which belongs to the general matching performance area; the corresponding sensitivity is 0.09, which belongs to the non-sensitive area, indicating that the water volume at the air conditioner terminal changes by 10%, and the heat exchange at the air conditioner terminal changes by 0.9%.

[0128] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only express several embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A building energy system operation evaluation method based on matching and sensitivity coupling, characterized in that: The steps include: Step S1: for the centralized air conditioning system in the building to be analyzed, select the air conditioning terminal to be analyzed and evaluated; Step S2, establishing an air conditioning system operation matching evaluation model and a system mismatch coefficient function expression, wherein the air conditioning system operation matching evaluation model includes the fire accumulation loss, heat transfer resistance, and the inlet and outlet temperatures of the cold and hot fluids at the air conditioning terminal involved in the operation of the air conditioning system, and establishing a correlation between the air conditioning system operation parameters. The fire accumulation loss calculation formula is: , where △ J loss is the fire loss, in units of ; Q is the heat transfer of the heat exchanger, in kW; T h,in is the thermodynamic temperature of the hot fluid inlet of the heat exchange coil, in K; T h,out is the thermodynamic temperature of the hot fluid outlet of the heat exchange coil, in K; T c,in is the thermodynamic temperature of the cold fluid inlet of the heat exchange coil, in K; T c,out is the thermodynamic temperature of the cold fluid outlet of the heat exchange coil, in K; The thermal resistance calculation formula of the heat transfer process of the hot and cold fluids in the heat exchange coil is: ； in, c h is the specific heat capacity of the heat fluid in the heat exchange coil, in J / ( ); is the mass flow rate of the thermal fluid in the heat exchange coil, in kg / s; ε is the heat transfer efficiency of the air conditioner terminal coil, dimensionless; The mismatch coefficient function Ψ The expression is: ， in, μ The expression is: ； Step S3: define the air conditioning system operation matching index and construct a matching function expression to define the air conditioning system operation matching index. φ The function expression is: ； Step S4: Establish matching degree grading standards and define matching degree evaluation grading areas for air-conditioning system terminal operation; Step S5: Establish an air conditioning system operation sensitivity analysis model, and the air conditioning terminal water flow is expressed as dimensionless relative water volume: ， in, is the dimensionless relative water volume at the air conditioning terminal; The running water volume of the air conditioner terminal, in kg / s; The rated water volume at the air conditioner terminal, in kg / s; Step S6: define the sensitivity index and construct a sensitivity function expression, and define the function expression of the air conditioning system operation sensitivity χ as: ； Step S7: Establish a sensitivity classification standard and define the terminal operation sensitivity classification area of ​​the air conditioning system; Step S8, obtain the operating parameters of the air conditioning terminal system, including the water side flow rate of the air conditioning terminal, the air side flow rate, the water side inlet and outlet water temperature of the air conditioning terminal, and the air side inlet and outlet air temperature of the air conditioning terminal, and calculate the logarithmic mean temperature difference of the heat exchange at the system terminal △ T m and the product of the heat transfer coefficient and the area KF ; Calculate the operation matching and sensitivity of the air conditioning system, and conduct a comprehensive evaluation of the operation performance of the air conditioning system according to the matching and sensitivity classification standards; Among them, the logarithmic mean temperature difference of the heat exchange at the end of the air conditioning system △ T m The expression is: ， The product of heat transfer coefficient and area KF The calculation expression is: 。 2. The method according to claim 1, characterized in that In step S1, the centralized air-conditioning system in the building includes a fan coil unit, a fresh air system, and a full air system, and the air-conditioning terminal includes a fan coil unit FCU and an air handling unit AHU in the air-conditioning system.

3. The method according to claim 1, characterized in that In step S2, the heat exchange efficiency of the air conditioner terminal coil ε satisfy: ； According to the heat transfer principle, the fluids on both sides of the heat exchange coil at the end of the air conditioning system satisfy the thermal balance equation: ， in, c c is the specific heat capacity of the cold fluid in the heat exchange coil, in J / ( ); is the mass flow rate of cold fluid in the heat exchange coil, in kg / s.

4. The method according to claim 3, characterized in that: In step S2, according to the heat exchange efficiency formula and the heat balance formula, the following is obtained: 。 5. The method according to claim 4, characterized in that In step S2, according to the heat transfer principle, when the heat transfer coefficient of the air conditioner terminal heat exchanger is known K Heat exchange area F When , the temperature of the cold and hot fluids satisfies the following formula: 。 6. The method according to claim 5, characterized in that In step S2, the thermal resistance of the heat transfer process of the hot and cold fluids in the heat exchange coil is expressed in the following form: ， in, R h is the thermal resistance of the heat transfer process of the hot and cold fluids in the heat exchange coil, K / W; Ψ is the mismatch coefficient; K is the heat transfer coefficient, W / ( ); F is the heat transfer area of ​​the heat exchange coil, in m 2 .

7. The method according to claim 1, characterized in that In the step S4, according to the heat exchange and inlet and outlet water temperatures of the air-conditioning terminal under different air volume gears and different inlet water flow conditions, the operation matching degree of the air-conditioning system terminal corresponding to the air volume gear and the inlet water flow condition is calculated, and the matching degree determined by the high-end air volume, rated water volume, and relative water volume of 1 is used as the first dividing line; the matching degree determined by the high-end air volume and relative water volume of 1.5 is used as the second dividing line; the matching degree determined by the low-end air volume, 50% of the high-end air volume, and the relative water volume of 1.5 is used as the third dividing line, and a matching degree grading standard is established accordingly, with a matching degree of 1 and the first dividing line, a matching degree of 1 and a matching degree of 2. φ is 0.89, constituting the first region; The first dividing line and the second dividing line, the matching degree φ It is 0.82, constituting the second region; The second dividing line and the third dividing line, the matching degree φ The third area is 0.78, which constitutes the third area; the third dividing line and the matching degree 0 constitute the fourth area; the terminal operation matching degree evaluation grading area of ​​the air conditioning system is: excellent: the first area is 0.89 < φ ≤1, good: Region II, i.e. 0.82< φ ≤0.89, general: Region III, i.e. 0.78< φ ≤0.82, difference: Region IV, i.e. 0< φ ≤0.

78.

8. The method according to claim 1, characterized in that In step S5, the air conditioning system operation sensitivity analysis model includes the correlation between the key operating parameters of the air conditioning system established by the air conditioning terminal heat exchange, air conditioning terminal water flow, air conditioning terminal air volume, and inlet and outlet temperatures of the cold and hot fluids at the air conditioning terminal involved in the operation of the air conditioning system, and quantifies the law and degree of mutual change of parameters. For the terminal of the air conditioning system, the two sides of the terminal heat exchange coil are water and air respectively. During the heat exchange process of the fluids on both sides of the coil, the air conditioning terminal heat exchange is expressed as a dimensionless relative heat exchange as follows: ， in, is the dimensionless relative heat exchange at the air conditioning terminal; The rated heat exchange of the air conditioner terminal, in kW; The water flow at the air conditioner terminal is expressed as dimensionless relative water volume: ， in, is the dimensionless relative water volume at the air conditioning terminal; The running water volume of the air conditioner terminal, in kg / s; The rated water volume at the air conditioner terminal, in kg / s; The air volume at the air conditioning terminal is expressed as dimensionless relative air volume: ， in, is the dimensionless relative air volume at the air conditioning terminal; The water volume of the air conditioner terminal, in m 3 / h; The rated air volume of the air conditioner terminal, in m 3 / h.

9. The method according to claim 1, characterized in that: In the step S7, according to the heat exchange amount and the inlet and outlet water temperature of the air-conditioning terminal under different air volume gears and different inlet water flow conditions, the operation sensitivity of the air-conditioning system terminal corresponding to the air volume gear and the inlet water flow condition is calculated; the sensitivity determined by the high-grade air volume relative air volume of 1 and the rated water volume relative water volume of 1 is used as the first dividing line; the sensitivity determined by the low-grade air volume relative air volume of 0.5 and the rated water volume relative water volume of 1 is used as the second dividing line, and the sensitivity grading standard is established accordingly, with the sensitivity higher than the first dividing line, and the sensitivity lower than the first dividing line. χ The sensitivity zone is 0.5, which is the first zone. The sensitivity zone is the first and second dividing lines. χ is 0.2, constituting the second area, i.e. the transition area; with the sensitivity lower than the second dividing line, the sensitivity χ 0.2 constitutes the third area, i.e., the non-sensitive area; the terminal operation sensitivity evaluation classification areas of the air-conditioning system are: sensitive area: the first area, χ ≥0.5, Transition zone: Region II 0.2< χ <0.5, Non-sensitive area: Area III χ ≤0.

2.

10. The method according to claim 9, characterized in that In step S7, according to the matching degree in step S3, φ The function expression of the air conditioning system operation matching degree is calculated according to the sensitivity in step S6. χ The operating sensitivity of the air-conditioning system is calculated by using a function expression; and the operating performance of the air-conditioning system is comprehensively evaluated according to the matching degree grading standard and the sensitivity grading standard described in step S4 and step S7.

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