A method for correcting the power consumption of the HVAC system in the overall performance test of the unit

Abstract

The present invention discloses a method for correcting the power consumption of a heating, ventilation, and air conditioning (HVAC) system during the overall performance test of a unit, which includes the steps of: A. Before the test, list the power design values of the HVAC equipment in the whole plant according to regions and commonality; B. Confirm the number of equipment, the designed operating number, and the commonality coefficient of the HVAC equipment in each region; C. Obtain the power consumption design value of the HVAC in the whole plant; D. During the test, the operating personnel and witnesses check the HVAC in the whole plant and count the actual operating number of the equipment in each region; E. Obtain the theoretical actual value of the power consumption of the HVAC in the whole plant; F. Obtain the total correction amount of the power consumption of the HVAC during the test; G. The total correction amount of the power consumption calculated according to steps A to J can reflect the power consumption value of the system under the design conditions. Using the correction method provided by the present invention, the power consumption of the measured HVAC equipment can be corrected to the design conditions, which is helpful for comparing the overall performance test results of thermal power units with the design guarantee values.

Description

Technical Field

[0001] The invention belongs to the field of thermal performance test of thermal power units, and in particular relates to a method for correcting the power consumption of a heating and ventilation system in an overall performance test of a unit. Background Art

[0002] In the overall performance test of thermal power units, many auxiliary equipment and devices are complex in structure and mostly consist of a large number of low-power devices. Therefore, it is impossible to fully count and measure their power consumption in actual engineering projects. As a major auxiliary equipment of thermal power units, the HVAC equipment of thermal power units (self-use HVAC of unit-type units, common HVAC of multiple units, and HVAC of buildings such as public facilities and office facilities in the whole plant) is very complex and mostly low-power equipment. In addition, since the HVAC equipment is spread throughout the plant, its equipment wiring is also very complicated. Therefore, it is impossible to effectively and directly measure its actual power consumption in actual engineering projects.

[0003] The main factors affecting the actual power consumption of the unit's HVAC equipment include:

[0004] (1) During the test, HVAC equipment in some areas did not operate according to its designed operating quantity;

[0005] (2) During the test period, the HVAC equipment in some areas had not been debugged;

[0006] (3) When the ambient temperature changes, some HVAC equipment that should be in operation may be turned off or in standby mode;

[0007] (4) Factors affecting the actual power consumption of HVAC equipment by the temperature difference between the ambient temperature and the equipment set temperature;

[0008] (5) Different operators have different operating habits.

[0009] Among the equipment in thermal power plants, the power consumption of auxiliary equipment is an extremely important guarantee indicator in the performance assessment test of thermal power units, and has a direct impact on the overall performance test results of thermal power units. It is not only an important component of the unit's power supply coal consumption, but also an important indicator reflecting the power consumption of the unit's auxiliary equipment.

[0010] In summary, a correction method for the power consumption of HVAC equipment in the calculation of plant power consumption rate is needed to make the power consumption of HVAC equipment in the overall performance test of thermal power units closer to the actual power consumption, thereby making the overall performance test results of thermal power units more accurate. Summary of the invention

[0011] The object of the present invention is to provide a method for correcting the power consumption of the HVAC system in the overall performance test of the unit. In the overall performance test of a thermal power unit, the measured power consumption of the HVAC equipment can be corrected to the corresponding design conditions by using the method provided by the present invention.

[0012] To achieve the above object, the present invention adopts the following technical solutions:

[0013] A method for correcting the power consumption of the HVAC system in the overall performance test of the unit, comprising the following steps:

[0014] A. Before the overall performance test of the unit, list the rated power values of the HVAC equipment in the whole plant according to the regional division through the design data and the building installation drawings, and distinguish them according to the commonality such as self-use of a single unit, common use of two or more units, and common use of the whole plant, and then proceed to step B;

[0015] B. Since the HVAC system usually has redundant design and there are a certain number of standby equipment, before the overall performance test of the unit, confirm the total number of equipment and the designed operating number of the HVAC equipment in different regions; confirm the commonality coefficient of the HVAC equipment in different regions, and then proceed to step C;

[0016] C. Before the overall performance test of the unit, obtain the designed ambient temperature T design during the operation of the unit through the unit design data, and then proceed to step D;

[0017] D. During the overall performance test of the unit, record the ambient temperature T1, and then proceed to step E;

[0018] E. During the overall performance test of the unit, have the specialized operating personnel and the witnesses of all parties to the test check the HVAC equipment in the whole plant, count the actual operating number of the HVAC equipment in each region of the whole plant, and the set temperature T2 of each HVAC equipment, and record them in the HVAC equipment list in the above steps; the witnesses of all parties to the test should confirm that the statistical results are valid, and then proceed to step F;

[0019] F. Through the correction coefficient curve of the equipment power consumption with respect to the temperature difference between the ambient temperature and the set temperature provided by the HVAC equipment manufacturer, obtain the temperature correction coefficient of each equipment for the temperature difference between the designed ambient temperature T design and the set temperature T2, and then proceed to step G;

[0020] G. Calculate the rated power consumption value of the HVAC equipment in the whole plant, and then proceed to step H;

[0021] H. Through the correction coefficient curve of the equipment power consumption with respect to the temperature difference between the ambient temperature and the set temperature provided by the HVAC equipment manufacturer, obtain the correction coefficient of each equipment for the temperature difference between the test ambient temperature T1 and the set temperature T2, and then proceed to step I;

[0022] I. Calculate the theoretical actual value of the electricity consumption of the HVAC equipment in the whole plant and proceed to step J;

[0023] J. Calculate the total correction amount of the electricity consumption of the HVAC equipment in the overall performance test of the unit set and proceed to step K;

[0024] K. Conduct the overall performance test of the unit set according to steps A to J. The total correction amount of the electricity consumption of the HVAC equipment calculated in the overall performance test of the unit set can reflect the power consumption value of the system under the design conditions.

[0025] A further improvement of the present invention lies in that in step A, different common coefficients are considered for the self - used equipment of a single unit, the common equipment of two or more units, and the common equipment of the whole plant to correct their electricity consumption values, so as to reflect the actual electricity consumption of the HVAC system to the greatest extent.

[0026] A further improvement of the present invention lies in that in step B, it is fully considered that there is a certain redundant design in the design stage of the system. By counting the total number of equipment and the designed operation number of the HVAC equipment in different areas, the actual operation situation of the equipment can be more comprehensively reflected, and the actual electricity consumption of the HVAC system can be reflected to the greatest extent.

[0027] A further improvement of the present invention lies in that in steps C and D, the designed ambient temperature and the actual ambient temperature are compared, and the actual ambient temperature during the test is corrected to the designed ambient temperature to ensure that the electricity consumption values of the HVAC system equipment are compared under the same designed ambient conditions.

[0028] A further improvement of the present invention lies in that in step E, on - site inspections are carried out by personnel to ensure the actual operation status of the HVAC equipment, and the factor that the electricity consumption of the air conditioner is different at different set temperatures is considered, so as to reflect the actual electricity consumption of the HVAC system to the greatest extent.

[0029] A further improvement of the present invention lies in that in step G, the designed electricity consumption value of the HVAC equipment in the whole plant is calculated according to formula (1):

[0030] P HVAC_design =(∑P 1_i ×N 1_i ×μ 1_i )×γ1+(∑P 2_i ×N 2_i ×μ 2_i )×γ2+…+(∑P n_i ×N n_i ×μ n_i )×γ n (1)

[0031] Wherein, P HVAC_design is the designed electricity consumption value of the HVAC equipment in the whole plant, with the unit of kW; P1_i is the designed power consumption value of the HVAC equipment in each area for self-use of this unit, P 2_i is the designed power consumption value of the HVAC equipment in each area shared by two units, and so on, P n_i is the designed power consumption value of the HVAC equipment in each area shared by n units in the whole plant, with the unit of kW; N 1_i is the designed operation quantity of the HVAC equipment in each area for self-use of this unit, N 2_i is the designed operation quantity of the HVAC equipment in each area shared by two units, and so on, N n_i is the designed operation quantity of the HVAC equipment in each area shared by n units in the whole plant, with the unit of piece; γ1 is the common coefficient of the HVAC equipment in each area for self-use of this unit, γ2 is the common coefficient of the HVAC equipment in each area shared by two units, γ n is the common coefficient of the HVAC equipment in each area shared by n units in the whole plant, which is a dimensionless quantity; μ 1_i is the temperature correction coefficient of the HVAC equipment in each area for self-use of this unit under the design conditions, μ 2_i is the temperature correction coefficient of the HVAC equipment in each area shared by two units under the design conditions, μ n_i is the temperature correction coefficient of the HVAC equipment in each area shared by n units in the whole plant under the design conditions, which is a dimensionless quantity.

[0032] A further improvement of the present invention lies in that, in step I, the theoretical actual value of the power consumption of the HVAC equipment in the whole plant is calculated according to formula (2):

[0033]

[0034] wherein, P HVAC_test is the theoretical actual value of the power consumption of the HVAC equipment in the whole plant, with the unit of kW; is the actual operation quantity of the HVAC equipment in each area for self-use of this unit, is the actual operation quantity of the HVAC equipment in each area shared by two units, is the actual operation quantity of the HVAC equipment in each area shared by n units in the whole plant, with the unit of piece; η 1_i is the temperature correction coefficient of the HVAC equipment in each area for self-use of this unit under the test conditions, η 2_i is the temperature correction coefficient of the HVAC equipment in each area shared by two units under the design conditions, η n_i is the temperature correction coefficient of the HVAC equipment in each area shared by n units in the whole plant under the design conditions, which is a dimensionless quantity.

[0035] A further improvement of the present invention lies in that, in step J, the total correction amount of the power consumption of the HVAC equipment in the overall performance test of the unit is calculated according to formula (3):

[0036] ΔP correction = P HVAC_design - P HVAC_test (3)

[0037] Wherein, ΔP correction is the power consumption correction amount of the HVAC equipment in the overall performance test of the unit, in kW.

[0038] The present invention has at least the following beneficial technical effects:

[0039] In the overall performance test of a thermal power unit, the factors affecting the power consumption of the HVAC equipment can be corrected to the design conditions by using the correction method provided by the present method, so that the obtained power consumption value of the HVAC equipment can reflect the power consumption under the design conditions, which helps to compare the overall performance test results of the thermal power unit with the design guarantee value. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic flow chart of the present invention.

[0041] Figure 2 is a correction curve graph of the ambient temperature and the set temperature difference on the power consumption of the HVAC equipment in the numerical example of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0043] As shown in the Figure 1 flow chart shown, a correction method for the power consumption of the HVAC system in the overall performance test of the unit provided by the present invention includes the following steps:

[0044] A. Before the overall performance test of the unit, list the power design values of the HVAC equipment in the whole plant according to the regional division through the design data and the building installation drawings, and distinguish them according to the commonality such as self-use of a single unit, common use of two or more units, and common use of the whole plant. Proceed to step B;

[0045] B. Since the HVAC system usually has a redundant design and there are a certain number of standby devices, before the overall performance test of the unit, confirm the total number of HVAC devices and the designed operating number in different areas; confirm the common use factor of HVAC devices in different areas. For example, the common use factor of the HVAC devices in each area for the self - use of this unit is taken as 1, and the common use factor of the HVAC devices in each area shared by two units is taken as The common use factor of the HVAC devices in each area shared by n units is taken as Proceed to step C;

[0046] C. Before the overall performance test of the unit, obtain the designed ambient temperature T during the operation of the unit from the unit design data design Proceed to step D;

[0047] D. During the overall performance test of the unit, record the ambient temperature T1. Proceed to step E;

[0048] E. During the overall performance test of the unit, have the dedicated operating personnel and the witnesses from all parties involved in the test check the HVAC devices in the whole plant, count the actual operating number of the HVAC devices in each area of the whole plant, and the set temperature T2 of each HVAC device, and record them in the HVAC device list in the above steps. The witnesses from all parties involved in the test should confirm that the statistical results are valid. Proceed to step F;

[0049] F. Through the correction coefficient curve of the power consumption of the device with respect to the temperature difference between the ambient temperature and the set temperature provided by the HVAC device manufacturer, obtain the temperature correction coefficient for each device with respect to the temperature difference between the designed ambient temperature T design and the set temperature T2. Proceed to step G;

[0050] G. The designed power consumption value of the HVAC devices in the whole plant is calculated according to formula (1):

[0051]

[0052] where P HVAC_design is the designed power consumption value of the HVAC devices in the whole plant, with the unit of kW; P 1_i is the designed power consumption value of the HVAC devices in each area for the self - use of this unit, P 2_i is the designed power consumption value of the HVAC devices in each area shared by two units, and so on, P n_i is the designed power consumption value of the HVAC devices in each area shared by the whole plant (n units), with the unit of kW; N 1_i is the designed operating number of the HVAC devices in each area for the self - use of this unit, N 2_i is the designed operating number of the HVAC devices in each area shared by two units, and so on, N n_iThe designed operation quantity of HVAC equipment in each area shared by the whole plant (n machines), unit: piece; γ1 is the sharing coefficient of HVAC equipment in each area for its own use, γ2 is the sharing coefficient of HVAC equipment in each area shared by two machines, γ n is the sharing coefficient of HVAC equipment in each area shared by the whole plant (n machines), dimensionless; μ 1_i is the temperature correction coefficient of HVAC equipment in each area for its own use under design conditions, μ 2_i is the temperature correction coefficient of HVAC equipment in each area shared by two machines under design conditions, μ n_i is the temperature correction coefficient of HVAC equipment in each area shared by the whole plant (n machines) under design conditions, dimensionless. Proceed to step H;

[0053] H. Obtain the temperature correction coefficient of each equipment for the temperature difference between the test ambient temperature T1 and the set temperature T2 through the correction coefficient curve of the equipment power consumption with respect to the temperature difference between the ambient temperature and the set temperature provided by the HVAC equipment manufacturer. Proceed to step I;

[0054] I. The theoretical actual value of the power consumption of the whole plant's HVAC equipment is calculated according to formula (2):

[0055]

[0056] where, P HVAC_test is the theoretical actual value of the power consumption of the whole plant's HVAC equipment, unit: kW; is the actual operation quantity of HVAC equipment in each area for its own use, is the actual operation quantity of HVAC equipment in each area shared by two machines, is the actual operation quantity of HVAC equipment in each area shared by the whole plant (n machines), unit: piece; η 1_i is the temperature correction coefficient of HVAC equipment in each area for its own use under test conditions, η 2_i is the temperature correction coefficient of HVAC equipment in each area shared by two machines under design conditions, η n_i is the temperature correction coefficient of HVAC equipment in each area shared by the whole plant (n machines) under design conditions, dimensionless. Proceed to step J;

[0057] J. The total correction amount of the power consumption of HVAC equipment in the overall performance test of the unit is calculated according to formula (3):

[0058] ΔP correction =P HVAC_design -P HVAC_test (3)

[0059] where, ΔP correctionIt is the power consumption correction amount of the HVAC equipment in the overall performance test of the unit, in kW. Proceed to step K;

[0060] K. Conduct the overall performance test of the unit according to steps A to J, and calculate the total power consumption correction amount ΔP of the HVAC equipment in the overall performance test of the unit correction It can reflect the power consumption value of the system under the design conditions.

[0061] The following is an example of the power consumption correction calculation of the HVAC equipment in a thermal power project:

[0062] Table 1 Example of the power consumption correction calculation of the HVAC equipment in a thermal power project

[0063]

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070]

[0071] As can be seen from Table 1, in this example, the total power consumption correction amount of the HVAC equipment is 255.748 kW, and the measured total auxiliary power consumption value of the unit is 56950.7 kW. In the later performance test calculation, add 255.748 kW to the total plant power consumption. After calculating the overall performance test, the total auxiliary power consumption value after correcting the power consumption of the HVAC equipment is 56950.7 kW.

[0072] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A method for correcting the power consumption of the HVAC system in the overall performance test of the unit, characterized in that, It includes the following steps: A. Before the overall performance test of the unit, list the designed power values of the HVAC equipment in the whole plant according to the regional division through design materials and construction and installation drawings, and distinguish them according to the commonality such as self-use of a single unit, common use of two or more units, and common use of the whole plant, and then enter step B; B. Since the HVAC system usually has redundant design and there are a certain number of standby equipment, before the overall performance test of the unit, confirm the total number of equipment and the designed operating number of the HVAC equipment in different regions; confirm the commonality coefficient of the HVAC equipment in different regions, and then enter step C; C. Before the overall performance test of the unit, obtain the designed ambient temperature T during the operation of the unit from the unit design data design , and proceed to step D; D. During the overall performance test of the unit, record the ambient temperature T1, and then enter step E; E. During the overall performance test of the unit, have the dedicated operating personnel and witnesses from all parties involved in the test check the HVAC equipment in the whole plant, count the actual operating number of the HVAC equipment in each region of the whole plant, and the set temperature T2 of each HVAC equipment, and record them in the HVAC equipment list in the above steps; the witnesses from all parties involved in the test should confirm that the statistical results are valid, and then enter step F; F. Obtain the design ambient temperature T through the correction factor curve of the equipment power consumption with respect to the temperature difference between the ambient temperature provided by the HVAC equipment manufacturer and the set temperature design for the temperature correction factor of each piece of equipment with respect to the temperature difference between the design ambient temperature T and the set temperature T2, and proceed to step G; G. Calculate the designed power consumption value of the HVAC equipment in the whole plant, and then enter step H; H. Through the correction coefficient curve of the power consumption of the equipment with the temperature difference between the ambient temperature and the set temperature provided by the HVAC equipment manufacturer, obtain the correction coefficient of the temperature difference between the test ambient temperature T1 and the set temperature T2 for each equipment, and then enter step I; I. Calculate the theoretical actual value of the power consumption of the HVAC equipment in the whole plant, and then enter step J; J. Calculate the total correction amount of the power consumption of the HVAC equipment in the overall performance test of the unit, and then enter step K; K. Conduct the overall performance test of the unit according to steps A to J, and the total correction amount of the power consumption of the HVAC equipment calculated in the overall performance test of the unit can reflect the power consumption value of the system under the design conditions.

2. A method for correcting the power consumption of a heating, ventilation, and air conditioning (HVAC) system in an overall performance test of a unit, characterized in that, In step A, different commonality coefficients are considered for the self-use equipment of a single unit, the common-use equipment of two or more units, and the common-use equipment of the whole plant to correct their power consumption values, so as to reflect the actual power consumption of the HVAC system to the greatest extent.

3. A method for correcting the power consumption of the HVAC system in the overall performance test of the unit, characterized in that, In step B, fully consider that there is a certain redundant design in the design stage of the system. By counting the total number of equipment and the designed operating number of the HVAC equipment in different regions, more comprehensively reflect the actual operating conditions of the equipment and the actual power consumption of the HVAC system to the greatest extent.

4. A method for correcting the power consumption of the HVAC system in the overall performance test of the unit, characterized in that, In steps C and D, compare the designed ambient temperature with the actual ambient temperature, and correct the actual ambient temperature during the test to the designed ambient temperature to ensure that the power consumption values of the HVAC system equipment are compared under the same designed ambient temperature conditions.

5. A method for correcting the power consumption of a HVAC system in the overall performance test of a unit, characterized in that, In step E, conduct on-site inspections through personnel to ensure the actual operating status of the HVAC equipment, and consider the factor that the power consumption of the air conditioner is different at different set temperatures, so as to reflect the actual power consumption of the HVAC system to the greatest extent.

6. A method for correcting the power consumption of the HVAC system in the overall performance test of the unit, characterized in that, In step G, the designed power consumption value of the HVAC equipment in the whole plant is calculated according to formula (1): P HVAC_design = (∑P 1_i × N 1_i × μ 1_i ) × γ1 + (∑P 2_i × N 2_i × μ 2_i ) × γ2 + … + (∑P n_i × N n_i × μ n_i ) × γ n (1) Among them, P HVAC_design is the designed power consumption value of the HVAC equipment for the whole plant, with the unit of kW; P 1_i is the designed power consumption value of the HVAC equipment for each area for self-use of this machine, P 2_i is the designed power consumption value of the HVAC equipment for each area shared by two machines, and so on, P n_i is the designed power consumption value of the HVAC equipment for each area shared by n machines in the whole plant, with the unit of kW; N 1_i is the designed operation quantity of the HVAC equipment for each area for self-use of this machine, N 2_i is the designed operation quantity of the HVAC equipment for each area shared by two machines, and so on, N n_i is the designed operation quantity of the HVAC equipment for each area shared by n machines in the whole plant, with the unit of piece; γ1 is the common coefficient of the HVAC equipment for each area for self-use of this machine, γ2 is the common coefficient of the HVAC equipment for each area shared by two machines, γ n is the common coefficient of the HVAC equipment for each area shared by n machines in the whole plant, which is a dimensionless quantity; μ 1_i is the temperature correction coefficient of the HVAC equipment for each area for self-use of this machine under the design conditions, μ 2_i is the temperature correction coefficient of the HVAC equipment for each area shared by two machines under the design conditions, μ n_i is the temperature correction coefficient of the HVAC equipment for each area shared by n machines in the whole plant under the design conditions, which is a dimensionless quantity.

7. A method for correcting the electricity consumption of a heating, ventilation, and air conditioning (HVAC) system in an overall unit performance test according to claim 6, characterized in that, In step I, the theoretical actual value of the power consumption of the HVAC equipment in the whole plant is calculated according to formula (2): Among them, P HVAC_test is the theoretical actual value of the power consumption of the HVAC equipment for the whole plant, with the unit of kW; is the actual operating quantity of the HVAC equipment in each area for self-use of this machine, is the actual operating quantity of the HVAC equipment in each area shared by two machines, is the actual operating quantity of the HVAC equipment in each area shared by n machines for the whole plant, with the unit of piece; η 1_i is the temperature correction coefficient of the HVAC equipment in each area for self-use of this machine under test conditions, η 2_i is the temperature correction coefficient of the HVAC equipment in each area shared by two machines under design conditions, η n_i is the temperature correction coefficient of the HVAC equipment in each area shared by n machines for the whole plant under design conditions, which is a dimensionless quantity.

8. A method for correcting the power consumption of a heating, ventilation, and air conditioning (HVAC) system in an overall unit performance test according to claim 7, characterized in that In step J, the total correction amount of the power consumption of the HVAC equipment in the overall performance test of the unit is calculated according to formula (3): ΔP correction = P HVAC_design - P HVAC_test (3) Among them, ΔP correction is the correction amount of the power consumption of the HVAC equipment in the overall performance test of the unit, in kW.

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