A subway equipment room equipment heat generation measurement system and method

Abstract

The present invention discloses a system and method for measuring the heat generation of equipment in subway equipment rooms, relating to the technical field of subway equipment rooms, and solving the technical problems of lacking an accurate measurement method for the heat generation of equipment in subway equipment rooms and a sensor system specifically for measuring subway equipment. It includes an indirect method for measuring the heat generation of subway equipment system and a direct method for measuring the heat generation of subway equipment system connected to the same data recorder, and comprehensively uses the direct measurement method and the indirect measurement method to measure the heat generation data of subway equipment. By calculating, the measurement results of the heat generation of subway equipment by the direct measurement method are mutually corrected and verified with the measurement results of the heat generation of subway equipment by the indirect measurement method, improving the accuracy of the measurement results of the heat generation of subway equipment, reducing the installed capacity of the subway air-conditioning system, and reducing the operating energy consumption and carbon emissions of the subway air-conditioning system.

Description

Technical Field

[0001] The present invention relates to the technical field of subway equipment rooms, and more specifically, to a measuring system and method for the heat generation of equipment in subway equipment rooms. Background Art

[0002] As a powerful tool for urban rail transit, the subway has become the main means to solve the problem of urban traffic congestion; due to the huge investment and obvious public welfare characteristics of the subway, it has increased the local debt burden to a certain extent. The subway construction should strengthen the exploration and design and strive to improve the investment efficiency.

[0003] The equipment load of the subway equipment room accounts for a large proportion of the total air-conditioning load of the subway equipment room, and the air-conditioning load of the subway station equipment room is relatively complex. The corresponding equipment load of the equipment room is difficult to determine, and generally, the air-conditioning load is calculated according to the data provided by relevant professionals; due to the lack of an accurate measurement method for the heat generation of equipment in the subway equipment room and a dedicated measurement equipment system, there is currently no accurate and reliable basis and reference value for the heat generation of equipment in the subway equipment room during the design of the domestic subway air-conditioning system, making it difficult to accurately determine the air-conditioning load of the subway equipment, which brings difficulties to the design of the subway air-conditioning system.

[0004] During the design of the domestic subway air-conditioning system, the calculated value of the heat generation of equipment in the subway equipment room is generally too large, resulting in an oversized design value of the air-conditioning load of the subway equipment room, which not only increases the construction costs of the air-conditioning system and the civil engineering, but also increases the energy consumption of the subway air-conditioning system, not meeting the national requirements for energy conservation and emission reduction. Therefore, accurately measuring the heat generation of equipment in the subway equipment room is particularly important, which can provide a reliable reference and basis for the design calculation of the subway equipment load, reduce the installed capacity of the subway air-conditioning system, reduce the construction cost of the subway air-conditioning, reduce the operating energy consumption of the subway air-conditioning system, and reduce the carbon emissions of the subway air-conditioning system. Summary of the Invention

[0005] The purpose of the present invention is to provide a measuring system for the heat generation of subway equipment that comprehensively adopts direct measurement methods and indirect measurement methods, as well as a method for measuring the heat generation of equipment, in view of the actual situation of the lack of an accurate measurement method for the heat generation of equipment in subway equipment rooms and a dedicated sensor system for measuring subway equipment.

[0006] The present invention specifically adopts the following technical solutions to achieve the above object:

[0007] A heat generation measurement system for subway equipment rooms, including an indirect method for measuring the heat generation of subway equipment and a direct method for measuring the heat generation of subway equipment, both connected to the same data recorder; the indirect method for measuring the heat generation of subway equipment includes an adiabatic canvas air bag, two enthalpy sensors, two air volume sensors, and a fan; the direct method for measuring the heat generation of subway equipment includes six heat flux density sensors and six temperature sensors; all the above sensors are connected to the data recorder by wires, and the data recorder is used to record and save sensor data.

[0008] Specifically, in the indirect method for measuring the heat generation of subway equipment, the adiabatic canvas air bag wraps the subway equipment, and two air vents are provided at both ends, namely the air inlet and the air outlet; an enthalpy sensor and an air volume sensor are provided at the air inlet, and another enthalpy sensor and an air volume sensor are provided at the air outlet; the fan is provided outside the air inlet to provide power for the air to flow in the adiabatic canvas air bag.

[0009] Specifically, in the direct method for measuring the heat generation of subway equipment, six heat flux density sensors are respectively arranged on the six surfaces of the subway equipment, namely the top, bottom, left, right, front, and back; similarly, six temperature sensors are also respectively arranged on the six surfaces of the subway equipment, namely the top, bottom, left, right, front, and back.

[0010] A method for measuring the heat generation of subway equipment rooms, using the above heat generation measurement system for subway equipment rooms, and adopting the following steps to determine the heat generation of subway equipment:

[0011] Calculate the heat generation Q1 of the subway equipment according to the data obtained by the indirect method for measuring the heat generation of the subway equipment;

[0012] Calculate the heat generation Q2 of the subway equipment according to the data obtained by the direct method for measuring the heat generation of the subway equipment;

[0013] Judge according to the values of the heat generation Q1 of the subway equipment measured by the indirect method and the heat generation Q2 of the subway equipment measured by the direct method, and then determine the heat generation of the subway equipment.

[0014] Specifically, calculate the heat generation Q1 of the subway equipment according to the data obtained by the indirect method for measuring the heat generation of the subway equipment, and specifically use formula (1) to calculate and determine:

[0015] Q1 = m in h in -m out h out (1)

[0016] In the formula, m in is the mass flow rate at the air inlet of the air bag; m out is the mass flow rate at the air outlet of the air bag; h inis the air enthalpy value at the air inlet of the air bag; h out is the air enthalpy value at the air outlet of the air bag.

[0017] Specifically, the heat generation Q2 of the subway equipment is calculated based on the data obtained from the direct method of measuring the heat generation of the subway equipment. Specifically, the surface heat flux density data is used and calculated and determined by Equation (2):

[0018] Q2 = q 左 A 左 + q 右 A 右 + q 上 A 上 + q 下 A 下 + q 前 A 前 + q 后 A 后 (2)

[0019] In the formula, q 左 is the heat flux density on the left surface of the equipment; q 右 is the heat flux density on the right surface of the equipment; q 上 is the heat flux density on the upper surface of the equipment; q 下 is the heat flux density on the lower surface of the equipment; q 前 is the heat flux density on the front surface of the equipment; q 后 is the heat flux density on the rear surface of the equipment; A 左 is the area of the left surface of the equipment; A 右 is the area of the right surface of the equipment; A 上 is the area of the upper surface of the equipment; A 下 is the area of the lower surface of the equipment; A 前 is the area of the front surface of the equipment; A 后 is the area of the rear surface of the equipment;

[0020] If it is difficult to accurately measure the surface heat flux density, the surface temperature data is used and calculated and determined by Equation (3):

[0021]

[0022] In the formula, q(t r ) is the surface heat flux density of the equipment; l is the component of the heat flux density test in a specific direction; k is the thermal diffusivity; r is the total time step; Δt is the time interval; c p is the specific heat capacity of air; ρ is the air density.

[0023] Specifically, a judgment is made based on the values of the heat generation Q1 of the subway equipment measured by the indirect method and the heat generation Q2 of the subway equipment measured by the direct method:

[0024] If the deviation between the heat generation quantity Q1 of subway equipment measured by the indirect measurement method and the heat generation quantity Q2 of subway equipment measured by the direct measurement method is less than 10%, then the average value of Q1 and Q2 is used as the heat generation quantity of the subway equipment.

[0025] If the deviation between the heat generation quantity Q1 of subway equipment measured by the indirect measurement method and the heat generation quantity Q2 of subway equipment measured by the direct measurement method is greater than 10%, then the heat flux density of each surface of the subway equipment is calculated using Equation (3), and the measured value of the heat flux density on the subway surface is corrected using the calculation result of Equation (3); if the deviation between the calculated value of the heat flux density and the measured value is less than 10%, then the heat generation quantity Q2 of the subway equipment measured by the direct measurement method is used as the heat generation quantity of the subway equipment; if the error between the calculated value of the heat flux density and the measured value is greater than 10%, then the heat generation quantity Q1 of the subway equipment measured by the indirect measurement method is used as the heat generation quantity of the subway equipment.

[0026] The beneficial effects of the present invention are as follows:

[0027] The advantages of the present invention are that the heat generation quantity of subway equipment is measured by comprehensively adopting the direct measurement method and the indirect measurement method, and the measurement results of the direct measurement method and the indirect measurement method can be mutually verified, thereby improving the accuracy of measuring the heat generation quantity of subway equipment, reducing the design value of the air conditioning load of subway equipment, saving the installed capacity and construction cost of the subway air conditioning system, and reducing the energy consumption and carbon emissions of the subway air conditioning system. Description of the Drawings

[0028] Figure 1 is the system composition for measuring the heat generation quantity of subway equipment by the indirect measurement method;

[0029] Figure 2 is the system composition for measuring the heat generation quantity of subway equipment by the direct measurement method;

[0030] Reference Numerals: 1 - adiabatic canvas air bag, 2 - fan, 3 - inlet air enthalpy sensor, 4 - inlet air volume sensor, 5 - outlet air volume sensor, 6 - outlet air enthalpy sensor, 7 - data recorder, 8 - left surface temperature sensor, 9 - left surface heat flux sensor, 10 - upper surface temperature sensor, 11 - upper surface heat flux sensor, 12 - right surface temperature sensor, 13 - right surface heat flux sensor, 14 - lower surface temperature sensor, 15 - lower surface heat flux sensor, 16 - front surface temperature sensor, 17 - rear surface temperature sensor, 18 - front surface heat flux sensor, 19 - rear surface heat flux sensor. Detailed Embodiments

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] As Figure 1 and Figure 2 shown, this embodiment provides a measurement system for the heat generation of subway equipment rooms, including an indirect method system for measuring the heat generation of subway equipment and a direct method system for measuring the heat generation of subway equipment, both of which are connected to the same data recorder 7. The data recorder is used to record and store sensor data.

[0035] The indirect method system for measuring the heat generation of subway equipment includes an adiabatic canvas air bag 1, two enthalpy sensors, two air volume sensors, and a fan 2, where the sensors are connected to the data recorder 7.

[0036] As Figure 1 shown, the adiabatic canvas air bag 1 wraps the subway equipment therein. Each end of the adiabatic canvas air bag 1 is provided with an air outlet, one for air inlet and the other for air exhaust; the fan 2 is used to provide power for the air to flow in the air bag. The inlet air enthalpy sensor 3 is used to measure the air enthalpy value at the air inlet of the air bag, the inlet air volume sensor 4 is used to measure the air mass flow rate at the air outlet of the air bag, the outlet air enthalpy sensor 6 is used to measure the air enthalpy value at the air outlet of the air bag, and the outlet air volume sensor 5 is used to measure the air mass flow rate at the air outlet of the air bag. The data recorder 7 is used to record and store sensor data.

[0037] The direct method system for measuring the heat generation of subway equipment includes six heat flux density sensors and six temperature sensors. The six heat flux density sensors are respectively arranged on the upper, lower, left, right, front, and rear surfaces of the subway equipment. Similarly, the six temperature sensors are also respectively arranged on the upper, lower, left, right, front, and rear surfaces of the subway equipment. These sensors are all connected to the data recorder 7 in a wired manner.

[0038] As Figure 2As shown, the left surface temperature sensor 8 is used to measure the left surface temperature of subway equipment, and the left surface heat flux sensor 9 is used to measure the left surface heat flux density of subway equipment; the upper surface temperature sensor 10 is used to measure the upper surface temperature of subway equipment, and the upper surface heat flux sensor 11 is used to measure the upper surface heat flux density of subway equipment; the right surface temperature sensor 12 is used to measure the right surface temperature of subway equipment, and the right surface heat flux sensor 13 is used to measure the right surface heat flux density of subway equipment; the lower surface temperature sensor 14 is used to measure the lower surface temperature of subway equipment, and the lower surface heat flux sensor 15 is used to measure the lower surface heat flux density of subway equipment; the front surface temperature sensor 16 is used to measure the front surface temperature of subway equipment, and the front surface heat flux sensor 18 is used to measure the front surface heat flux density of subway equipment; the rear surface temperature sensor 17 is used to measure the rear surface temperature of subway equipment, and the rear surface heat flux sensor 19 is used to measure the rear surface heat flux density of subway equipment; the data measured by the above sensors are all recorded and saved by the data recorder 7.

[0039] Embodiment 2

[0040] Using a measurement system for the heat generation of subway equipment rooms in Embodiment 1, this embodiment provides a method for measuring the heat generation of subway equipment rooms. The following steps are used to determine the heat generation of subway equipment:

[0041] Step 1, calculate the heat generation Q1 of subway equipment according to the data obtained by measuring the heat generation of subway equipment by the indirect method.

[0042] Specifically, the heat generation Q1 of subway equipment is calculated using Equation (1), where Equation (1) is as follows:

[0043] Q1 = m in h in -m out h out (1)

[0044] In the formula, m in is the mass flow rate at the air inlet of the air bag; m out is the mass flow rate at the air outlet of the air bag; h in is the air enthalpy value at the air inlet of the air bag; h out is the air enthalpy value at the air outlet of the air bag.

[0045] Step 2, calculate the heat generation Q2 of subway equipment according to the data obtained by measuring the heat generation of subway equipment by the direct method.

[0046] Specifically, the heat generation Q2 of subway equipment is calculated using Equation (2), where Equation (2) is as follows:

[0047] Q2 = q 左 A 左 +q 右 A 右 +q上 A 上 +q 下 A 下 +q 前 A 前 +q 后 A 后 (2)

[0048] In the formula, q 左 is the heat flux density on the left surface of the device; q 右 is the heat flux density on the right surface of the device; q 上 is the heat flux density on the upper surface of the device; q 下 is the heat flux density on the lower surface of the device; q 前 is the heat flux density on the front surface of the device; q 后 is the heat flux density on the rear surface of the device; A 左 is the area of the left surface of the device; A 右 is the area of the right surface of the device; A 上 is the area of the upper surface of the device; A 下 is the area of the lower surface of the device; A 前 is the area of the front surface of the device; A 后 is the area of the rear surface of the device;

[0049] If it is difficult to accurately measure the heat flux density of a certain surface of the subway device, use Equation (3) to calculate the heat flux density of this surface; the formula (3) for calculating the surface heat flux density based on the surface temperature of the device is as follows:

[0050]

[0051] In the formula, q(t r ) is the heat flux density of the device surface; l is the component of the heat flux density test in a specific direction; k is the thermal diffusivity; r is the total time step; Δt is the time interval; c p is the specific heat capacity of air; ρ is the air density.

[0052] Step 3: Judge based on the values of the heat generation Q1 of the subway device measured by the indirect method and the heat generation Q2 of the subway device measured by the direct method, and then determine the heat generation of the subway device.

[0053] If the deviation between the heat generation Q1 of the subway device measured by the indirect measurement method and the heat generation Q2 of the subway device measured by the direct measurement method is less than 10%, then use the average value of Q1 and Q2 as the heat generation of the subway device;

[0054] If the deviation between the heat generation Q1 of the subway device measured by the indirect measurement method and the heat generation Q2 of the subway device measured by the direct measurement method is greater than 10%, then use Equation (3) to calculate the heat flux density of each surface of the subway device, and use the calculation result of Equation (3) to correct the measured value of the subway surface heat flux density.

[0055] If the deviation between the calculated value and the measured value of the heat flux density is less than 10%, the heat generation Q2 of the subway equipment measured by the direct measurement method is taken as the heat generation of the subway equipment. If the error between the calculated value and the measured value of the heat flux density is greater than 10%, the heat generation Q1 of the subway equipment measured by the indirect measurement method is taken as the heat generation of the subway equipment.

Claims

1. A measuring system for the heat generation of equipment in subway equipment rooms, characterized in that, It includes an indirect method for measuring the heat generation of subway equipment and a direct method for measuring the heat generation of subway equipment, both of which are connected to the same data recorder; the indirect method for measuring the heat generation of subway equipment includes an adiabatic canvas air bag, two enthalpy sensors, two air volume sensors, and a fan; the direct method for measuring the heat generation of subway equipment includes six heat flux density sensors and six temperature sensors; all the above sensors are connected to the data recorder by wires, and the data recorder is used to record and save the sensor data; The following steps are adopted to determine the heat generation of subway equipment: calculate the heat generation Q1 of subway equipment based on the data obtained by the indirect method for measuring the heat generation of subway equipment; Calculate the heat generation Q2 of subway equipment based on the data obtained by the direct method for measuring the heat generation of subway equipment; Make a judgment based on the values of the heat generation Q1 of subway equipment measured by the indirect method and the heat generation Q2 of subway equipment measured by the direct method, and then determine the heat generation of subway equipment; The calorific value Q1 of subway equipment is calculated according to the data obtained by the indirect method for measuring the calorific value of subway equipment, and is specifically determined by using Equation (1): Q1 = m in h in - m out h out (1) In the formula, m in is the mass flow rate at the air inlet of the air bag; m out is the mass flow rate at the air outlet of the air bag; h in is the air enthalpy value at the air inlet of the air bag; h out is the air enthalpy value at the air outlet of the air bag. Calculate the heat generation Q2 of subway equipment based on the data obtained from the direct measurement of the heat generation of subway equipment. Specifically, use the surface heat flux density data and calculate and determine it using Equation (2): Q2 = q 左 A 左 +q 右 A 右 +q 上 A 上 +q 下 A 下 +q 前 A 前 +q 后 A 后 In Equation (2), q 左 is the heat flux density of the left surface of the equipment; q 右 is the heat flux density of the right surface of the equipment; q 上 is the heat flux density of the upper surface of the equipment; q 下 is the heat flux density of the lower surface of the equipment; q 前 is the heat flux density of the front surface of the equipment; q 后 is the heat flux density of the rear surface of the equipment; A 左 is the area of the left surface of the equipment; A 右 is the area of the right surface of the equipment; A 上 is the area of the upper surface of the equipment; A 下 is the area of the lower surface of the equipment; A 前 is the area of the front surface of the equipment; A 后 is the area of the rear surface of the equipment.

2. The heat generation measurement system for subway equipment rooms according to claim 1, characterized in that In the system for measuring the heat generation of subway equipment by the indirect method, the adiabatic canvas air bag wraps the subway equipment therein, Two air vents are respectively arranged at both ends, which are the air inlet and the air outlet; an enthalpy sensor and an air volume sensor are arranged at the air inlet, and another enthalpy sensor and an air volume sensor are arranged at the air outlet; the fan is arranged outside the air inlet to provide power for the air to flow in the adiabatic canvas air bag.

3. The heat generation measurement system for subway equipment rooms according to claim 2, wherein, In the system for measuring the heat generation of subway equipment by the direct method, six heat flux density sensors are respectively arranged on the six surfaces of the subway equipment, namely the top, bottom, left, right, front, and back; similarly, six temperature sensors are also respectively arranged on the six surfaces of the subway equipment, namely the top, bottom, left, right, front, and back.

4. The heat generation measurement system for subway equipment rooms according to claim 3, wherein, Use the surface temperature data and calculate and determine the heat generation on the equipment surface by using Equation (3): Where q(t r ) is the surface heat flux density of the device; l is the heat flux density test component in a specific direction; k is the thermal diffusivity; r is the total time step; Δt is the time interval; c p is the specific heat capacity of air; ρ is the air density.

5. A subway equipment room equipment heat generation measurement system according to claim 4, characterized in that, Make a judgment based on the values of the heat generation Q1 of subway equipment measured by the indirect method and the heat generation Q2 of subway equipment measured by the direct method: if the deviation between the heat generation Q1 of subway equipment measured by the indirect measurement method and the heat generation Q2 of subway equipment measured by the direct measurement method is less than 10%, then use the average value of Q1 and Q2 as the heat generation of subway equipment.

6. The calorific value measurement system for subway equipment rooms according to claim 5, characterized in that, Make a judgment based on the values of the heat generation Q1 of subway equipment measured by the indirect method and the heat generation Q2 of subway equipment measured by the direct method: if the deviation between the heat generation Q1 of subway equipment measured by the indirect measurement method and the heat generation Q2 of subway equipment measured by the direct measurement method is greater than 10%, then calculate the heat flux density of each surface of the subway equipment by using Equation (3), and use the calculation result of Equation (3) to correct the measured value of the heat flux density on the subway surface; if the deviation between the calculated value of the heat flux density and the measured value is less than 10%, then use the heat generation Q2 of subway equipment measured by the direct measurement method as the heat generation of subway equipment; if the error between the calculated value of the heat flux density and the measured value is greater than 10%, then use the heat generation Q1 of subway equipment measured by the indirect measurement method as the heat generation of subway equipment.

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