Spray cooling ventilation double-layer glass curtain wall test bed and test method thereof

Abstract

The invention discloses a spray cooling ventilating double-layer glass curtain wall test bed and a test method thereof, and relates to the technical field of energy-saving glass curtain wall test beds, and the spray cooling ventilating double-layer glass curtain wall test bed comprises a ventilating double-layer glass curtain wall, a spray cooling system and an electric control data acquisition system. Wherein the ventilation double-layer glass curtain wall is composed of a LOW-E glass curtain wall and a double-layer hollow glass curtain wall, a ventilation cavity exists between the LOW-E glass curtain wall and the double-layer hollow glass curtain wall, and air circulation can be controlled through a baffle; the spray cooling system comprises a water pump control device, a water pump and a spray head, and can spray water mist into the cavity to achieve the purpose of cooling; the electric control data acquisition system comprises a general control computer, a data acquisition instrument, a wind speed sensor, a temperature and humidity integrated instrument, an indoor scattered radiation meter, an indoor total radiation meter, a thermal resistor, an outdoor total radiation meter and an outdoor scattered radiation meter, and can measure temperature, humidity, wind speed and radiation intensity hourly; therefore, the heat exchange characteristic research experiment of the spray cooling ventilation double-layer glass curtain wall is realized.

Description

Technical Field

[0001] The present application relates to the technical field of energy-saving glass curtain wall test benches, and in particular to a spray cooling and ventilated double-layer glass curtain wall test bench and an experimental method thereof. Background Art

[0002] As global climate change and energy and environmental issues become increasingly prominent, building energy conservation has become a hot topic of concern to the international community. In building curtain wall systems, insulation, heat preservation and cooling are key technical challenges. Traditional air conditioning and refrigeration methods have problems such as high energy consumption and high environmental pressure, so it is imperative to seek a new energy-saving and cooling technology.

[0003] In recent years, double-layer glass curtain walls have been widely used and studied as a form of modern building exterior wall. Its double-layer structure can form an air interlayer, effectively increase the heat transfer resistance, and reduce the impact of the external environment on the interior of the building. Therefore, buildings with double-layer glass curtain walls can achieve good insulation and cooling effects in both cold and warm seasons, thereby significantly reducing heating and cooling energy consumption and achieving the goal of energy saving and emission reduction. Spray cooling technology uses the principle of water evaporation and heat absorption to significantly reduce the ambient temperature, and is an effective passive cooling technology. Spray cooling ventilated double-layer glass curtain wall is a building facade system that combines spray cooling technology and double-layer glass curtain wall, with unique energy-saving and cooling effects. The principle of spray cooling is to spray atomized droplets into the cavity and achieve the purpose of cooling through droplet evaporation.

[0004] At present, the spray cooling and ventilation double-layer glass curtain wall is rarely used in engineering due to its complex heat exchange characteristics and difficult experimental operation. At the same time, the optimal number of nozzles and pressure of the spray have not been confirmed. How to achieve precise control of the temperature and humidity inside the building, improve comfort and achieve energy saving effects is also an urgent issue to consider. Therefore, a spray cooling and ventilation double-layer glass curtain wall test bench is designed to provide a reference for its practical application and operation. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present application provides a spray cooling and ventilated double-layer glass curtain wall test bench and its experimental method, which uses a wind speed sensor, a temperature and humidity integrated instrument, a total radiation meter, a scattered radiation meter and a thermal resistor to record the temperature of the double-layer glass and the cavity, as well as the indoor and outdoor temperature, humidity and radiation hour by hour. At the same time, by controlling the flow rate and pressure of the spray, the spray control strategy can be obtained, the thermal performance of the glass curtain wall can be analyzed, and the spray cooling and ventilated double-layer glass curtain wall system can be improved.

[0006] To achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a spray cooling ventilated double-layer glass curtain wall test bench and an experimental method thereof. The test bench provided by the present invention comprises a ventilated double-layer glass curtain wall, a spray cooling system and an electric control data acquisition system; the ventilated double-layer glass curtain wall comprises a LOW-E glass curtain wall, a double-layer hollow glass curtain wall and a cavity, and the LOW-E glass curtain wall is fixed to the wall through a fixed steel frame; the spray cooling system comprises a water pump control device, a water pump and a nozzle, and the water pump and the nozzle are connected through a water pipe; the electric control data acquisition system comprises a master control computer and a data acquisition instrument, the master control computer is connected to a wind speed sensor, a temperature and humidity integrated instrument and a data acquisition instrument through a data transmission line, and the data acquisition instrument is connected to an indoor diffuse radiation meter, an indoor total radiation radiation meter, a thermal resistor, an outdoor total radiation radiation meter and an outdoor diffuse radiation meter through a data transmission line.

[0007] Preferably, the LOW-E glass curtain wall and the double-layer insulating glass curtain wall are 2.09 meters long and 2.38 meters high; the LOW-E glass curtain wall is 5 millimeters thick, and the double-layer insulating glass curtain wall is 20 millimeters thick.

[0008] Preferably, there are three nozzles, namely nozzle 1, nozzle 2, and nozzle 3. The nozzles are evenly distributed on the top of the cavity, 22.7 cm away from the double-layer hollow glass curtain wall, and the distance between each nozzle is 57.5 cm.

[0009] Preferably, the nozzle is composed of a nozzle body, a nozzle and a fixed striker, and the spray half angle of the nozzle is 30 degrees and the aperture is 0.15 mm.

[0010] Preferably, there are 45 thermal resistors, 25 of which are evenly distributed in the cavity, and the remaining 20 are respectively distributed in the center of both sides of the Low-E glass curtain wall and the double-layer insulating glass curtain wall; the vertical spacing of the thermal resistors is 40 cm, and the horizontal spacing is 28.75 cm.

[0011] Preferably, one end of the fixed steel frame is on the wall and the other end is on the Low-E glass curtain wall; there are four fixed steel frames distributed at the four corners of the Low-E glass curtain wall; the length of the fixed steel frame is 24 cm.

[0012] Preferably, the width of the cavity is 51 cm, and there are baffles at the top and bottom to control the upper and lower openings; when the baffles are opened, natural convection ventilation can be carried out.

[0013] Preferably, the data acquisition instrument can collect temperature data and indoor and outdoor radiation data of each thermal resistance measuring point hourly, and transmit them to the master control computer.

[0014] The present invention also provides a spray cooling ventilation double-layer glass curtain wall experimental method, comprising the following steps: S1. Before the experiment begins, place the wind speed sensor (1) at the same level as the glass curtain wall, hang the temperature and humidity integrated instrument (2) outdoors where it is not exposed to direct sunlight, set the data collection time interval for the thermal resistor temperature value and the indoor and outdoor radiation values ​​through the data acquisition instrument (13), and set the data collection time interval for the outdoor temperature, humidity and wind speed through the master control computer (14); S2, setting the spray time, spray pressure, spray flow rate and number of open nozzles through the water pump control device (12); S3. At the beginning of the experiment, the baffle (20) is opened, the upper and lower vents are opened, the water pump (11) is turned on through the water pump control device (12), water flows through the nozzle (5) to spray from top to bottom, and data is collected through the data acquisition instrument (13) and the master control computer (14); S4, after the spraying is finished, the water pump (11) and the baffle (20) are turned off, and the collected data are summarized, thereby completing the spray cooling and ventilated double-layer glass curtain wall heat transfer characteristic experiment.

[0015] The beneficial effects of the present invention are: (1) The present invention can effectively reduce indoor temperature through spray cooling technology and the thermal insulation performance of double-glazed glass, while utilizing natural convection ventilation to reduce energy consumption; (2) The present invention adopts an electronically controlled data acquisition system, which can collect indoor and outdoor temperature, humidity, wind speed, radiation and other data in real time, and analyze and process the data through the master control computer, which greatly saves experimental time; (3) The present invention can start and stop the experiment by setting the spray time, pressure, flow rate and adjusting the number of nozzles. The operation is convenient and the operation error is small. (4) The test bench provided by the present invention can effectively solve the problem of experimental measurement of heat transfer characteristics of spray-cooled and ventilated double-layer glass curtain walls, and promote the engineering application of spray-cooled and ventilated double-layer glass curtain walls. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a spray-cooled, ventilated double-glazed curtain wall test bench proposed for this application.

[0017] Figure 2 This is the nozzle and thermal resistor layout diagram proposed for this application.

[0018] Figure 3 Cross-section of the spray-cooled ventilated double-glazed curtain wall proposed for this application.

[0019] Figure 4 This is a schematic diagram of the nozzle structure of this application.

[0020] Figure 5 This is a temperature change diagram of the thermal resistor measuring point in the embodiment of the present application. In the figure: 1. Wind speed sensor; 2. Temperature and humidity integrated instrument; 3. Outdoor diffuse radiation meter; 4. Outdoor total radiation meter; 5. Nozzle; 6. Thermal resistor; 7. Low-E glass curtain wall; 8. Double-layer hollow glass curtain wall; 9. Indoor total radiation meter; 10. Indoor diffuse radiation meter; 11. High-pressure water pump; 12. Water pump control device; 13. Data acquisition instrument; 14. Master control computer; 15 Water pipe; 16. Fixed steel frame; 17. Data transmission line; 18. Wall; 19. Cavity; 20. Baffle; 51. Nozzle 1; 52. Nozzle 2; 53. Nozzle 3; 501. Nozzle body; 502. Nozzle; 503. Fixed impact pin. DETAILED DESCRIPTION

[0021] The present invention is further explained below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementations are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content. However, it should be clear that all inventions and creations using the concept of the present invention are protected. Example

[0022] like Figure 1-Figure 3A spray cooling ventilated double-layer glass curtain wall test bench is shown, comprising a ventilated double-layer glass curtain wall, a spray cooling system and an electric control data acquisition system; the ventilated double-layer glass curtain wall comprises a LOW-E glass curtain wall 7, a double-layer hollow glass curtain wall 8 and a cavity 19, the LOW-E glass curtain wall 7 is fixed to the wall 18 by a fixed steel frame 16, and the cavity 19 is located between the LOW-E glass curtain wall 7 and the double-layer hollow glass curtain wall 8, so as to realize natural convection ventilation; the spray cooling system comprises a water pump control device 12, a water pump 11 and a nozzle 5, the water pump 11 and the nozzle 5 are connected by a water pipe 15, and the pressure, flow rate and time interval of the spray can be set by the water pump control device 12; the electric control data acquisition system comprises a master control computer 14 and a data acquisition instrument 13, the master control computer 14 is connected to the wind speed sensor via a data transmission line 17 1. A temperature and humidity integrated instrument 2 and a data acquisition instrument 13. The data acquisition instrument 13 is connected to an indoor scattered radiation meter 10, an indoor total radiation meter 9, a thermal resistor 6, an outdoor total radiation meter 4 and an outdoor scattered radiation meter 3 through a data transmission line 17. The temperature and humidity integrated instrument 2 can collect outdoor temperature and humidity data in real time. The wind speed sensor 1 can collect outdoor wind speed and direction data. The data collected by the wind speed sensor 1 and the temperature and humidity integrated instrument 2 can be directly transmitted to the master control computer 14; the indoor total radiation meter 9 and the outdoor total radiation meter 4 respectively collect the total radiation indoors and outdoors, the indoor scattered radiation meter 10 and the outdoor scattered radiation meter 3 respectively collect the scattered radiation indoors and outdoors, that is, excluding direct radiation, and the thermal resistor 6 can collect the temperature of each measuring point; the data acquisition instrument 13 can collect temperature, radiation and other data and transmit them to the master control computer 14.

[0023] Specifically, it should be noted that the LOW-E glass curtain wall 7 and the double-layer hollow glass curtain wall 8 are 2.09 meters long and 2.38 meters high; the LOW-E glass curtain wall 7 is 5 mm thick, and the double-layer hollow glass curtain wall 8 is 20 mm thick, wherein the hollow part of the double-layer hollow glass curtain wall is filled with air; there are three nozzles 5, and the three nozzles are evenly distributed at the top of the cavity 19, a total of 22.7 centimeters away from the double-layer hollow glass curtain wall 8, and the distance between each nozzle is 57.5 centimeters. When the spray is turned on, the water mist will cover the entire cavity 19 through the three nozzles, and the water mist in the cavity 19 will condense into water droplets on the LOW-E glass curtain wall 7 and the double-layer hollow glass curtain wall 8, and flow out from the opening below.

[0024] As an implementation method in this embodiment, according to the attached Figure 3 and attached Figure 4As shown, the nozzle 5 is composed of a nozzle body 501, a nozzle 502 and a fixed striker 503. The spray half angle of the nozzle 5 is 30 degrees, wherein the nozzle body 501 is in a gradually shrinking shape. When the water flows through the channel of the nozzle body 501, the water flow is restricted by the small hole in the nozzle 502 and forms fine water columns under high pressure. These high-pressure water columns pass through the nozzle outlet and hit the fixed striker 503 to form droplets, which are sprayed out at a half angle of 30 degrees.

[0025] Specifically, it should be noted that there are 45 thermal resistors 6, 25 of which are evenly distributed in the cavity 19, and the remaining 20 are respectively distributed in the center of the two sides of the Low-E glass curtain wall 7 and the double-layer hollow glass curtain wall 8; the vertical spacing of the thermal resistors is 40 cm, and the horizontal spacing is 28.75 cm; the fixed steel frame 16 has one end on the wall 18 and the other end on the Low-E glass curtain wall 7; there are four fixed steel frames 16, which are distributed at the four corners of the Low-E glass curtain wall 7; the length of the fixed steel frame 16 is 24 cm; the width of the cavity 19 is 51 cm, and there are baffles 20 at the top and bottom to control the upper and lower openings; when the baffles 20 are opened, natural convection ventilation can be carried out; the data acquisition instrument 13 can collect the temperature data and indoor and outdoor radiation data of each thermal resistor 6 measuring point hourly, and transmit them to the master control computer 14.

[0026] Working principle and process: First, before the experiment begins, place the wind speed sensor 1 at the same level as the glass curtain wall to measure the outdoor wind speed. At the same time, hang the temperature and humidity integrated instrument 2 outdoors where it is not exposed to direct sunlight to measure the outdoor temperature and humidity. Set the data acquisition time interval of the thermal resistor temperature value and the indoor and outdoor radiation value through the data acquisition instrument 13, and set the data acquisition time interval of the outdoor temperature, humidity and wind speed through the master control computer 14 to facilitate data collection and recording, and then set the spray time, spray pressure, spray flow rate and the number of nozzles opened through the water pump control device 12 to control the spray amount and spray conditions; after the preparation work is completed, open the baffle 20 and open the upper and lower vents, and turn on the water pump 11 through the water pump control device 12 to allow the water flow to spray from top to bottom through the nozzle 5. During the spraying process, data is collected through the data acquisition instrument 13 and the master control computer 14, including parameters such as indoor and outdoor temperature and humidity, outdoor wind speed, measuring point temperature, and indoor and outdoor radiation, so as to analyze the heat exchange characteristics of the spray-cooled and ventilated double-layer glass curtain wall; after the spraying is completed, the water pump 11 and the baffle 20 are turned off, the collected data are summarized, and data analysis and evaluation are performed.

[0027] The present invention also provides the following specific experimental scheme: The thermal resistance temperature value (collected every 3 seconds), indoor and outdoor radiation values ​​(collected every 1 minute) are collected by the data acquisition instrument, and the outdoor temperature and humidity are collected separately by the temperature and humidity integrated instrument (collected every 1 minute). There are six options for setting the spray time, pressure and flow rate.

[0028] (1) Spray time 5 min, spray pressure 10 bar, spray flow rate 0.035 L / min, spray head 52 turned on.

[0029] (2) Spray time 5 min, spray pressure 20 bar, spray flow rate 0.057 L / min, spray head 52 turned on.

[0030] (3) Spraying time 5 min, spraying pressure 10 bar, spraying flow rate 0.038 L / min (nozzle 52), 0.037 L / min (nozzle 53), open nozzles 52 and 53.

[0031] (4) Spraying time 5 min, spraying pressure 20 bar, spraying flow rate 0.049 L / min (nozzle 52), 0.049 L / min (nozzle 53), turn on nozzles 52 and 53.

[0032] (5) Spraying time 5 min, spraying pressure 10 bar, spraying flow rate 0.030 L / min (nozzle 51), 0.030 L / min (nozzle 52), 0.031 L / min (nozzle 53), turn on nozzles 51, 52 and 53.

[0033] (6) Spraying time 5 min, spraying pressure 20 bar, spraying flow rate 0.044 L / min (nozzle 51), 0.044 L / min (nozzle 52), 0.044 L / min (nozzle 53), turn on nozzles 51, 52 and 53.

[0034] like Figure 5 As shown, it is a temperature variation diagram of the thermal resistance measuring point of the specific experimental scheme in this embodiment. Through the measuring point data, the heat exchange characteristics of the ventilated double-layer glass curtain wall under different spray control strategies can be clearly understood.

[0035] The above-described embodiments only express the preferred implementation modes of the present invention, and are only used to facilitate the description of the present invention, and are not intended to limit the present invention in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the present invention, equivalent embodiments made by partial changes or modifications using the technical contents disclosed in the present invention, without departing from the technical features of the present invention, still 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 spray cooling and ventilation double-layer glass curtain wall test bench, characterized by: Includes ventilated double-glazed curtain wall, spray cooling system and electronic control data acquisition system; The ventilated double-layer glass curtain wall comprises a LOW-E glass curtain wall (7), a double-layer hollow glass curtain wall (8) and a cavity (19); the LOW-E glass curtain wall (7) is fixed to the wall (18) via a fixed steel frame (16); The spray cooling system comprises a water pump control device (12), a water pump (11) and a spray head (5), wherein the water pump (11) and the spray head (5) are connected via a water pipe (15); The electronically controlled data acquisition system comprises a master control computer (14) and a data acquisition instrument (13); the master control computer (14) is connected to a wind speed sensor (1), a temperature and humidity integrated instrument (2) and a data acquisition instrument (13) via a data transmission line (17); the data acquisition instrument (13) is connected to an indoor diffuse pyranometer (10), an indoor total pyranometer (9), a thermal resistor (6), an outdoor total pyranometer (4) and an outdoor diffuse pyranometer (3) via a data transmission line (17).

2. A spray cooling and ventilation double-layer glass curtain wall test bench according to claim 1, characterized in that: The Low-E glass curtain wall (7) and the double-layer insulating glass curtain wall (8) are 2.09 meters long and 2.38 meters high; the Low-E glass curtain wall (7) is 5 millimeters thick, and the double-layer insulating glass curtain wall (8) is 20 millimeters thick.

3. A spray cooling and ventilation double-layer glass curtain wall test bench according to claim 1, characterized in that: There are three nozzles (5), namely nozzle 1 (51), nozzle 2 (52), and nozzle 3 (53). The nozzles are evenly distributed at the top of the cavity (19), 22.7 cm away from the double-layer hollow glass curtain wall (8), and the distance between the nozzles is 57.5 cm.

4. A spray cooling and ventilation double-layer glass curtain wall test bench according to claim 1, characterized in that: The nozzle (5) is composed of a nozzle body (501), a nozzle (502) and a fixed striker (503); the spray half angle of the nozzle (5) is 30 degrees and the aperture is 0.15 mm.

5. The spray cooling and ventilation double-layer glass curtain wall test bench according to claim 1 is characterized in that: There are 45 thermal resistors (6), 25 of which are evenly distributed in the cavity (19), and the remaining 20 are respectively distributed in the center of both sides of the Low-E glass curtain wall (7) and the double-layer insulating glass curtain wall (8); the vertical spacing of the thermal resistors is 40 cm, and the horizontal spacing is 28.75 cm.

6. A spray cooling and ventilation double-layer glass curtain wall test bench according to claim 1, characterized in that: The fixed steel frame (16) has one end on the wall (18) and the other end on the Low-E glass curtain wall (7); there are four fixed steel frames (16) distributed at the four corners of the Low-E glass curtain wall (7); the length of the fixed steel frame (16) is 24 centimeters.

7. The spray cooling and ventilation double-layer glass curtain wall test bench according to claim 1 is characterized in that: The width of the cavity (19) is 51 centimeters, and baffles (20) are provided at the upper and lower parts to control the opening and closing of the upper and lower openings; when the baffles (20) are opened, natural convection ventilation can be performed.

8. The spray cooling and ventilation double-layer glass curtain wall test bench according to claim 1 is characterized in that: The data acquisition device (13) can collect temperature data and indoor and outdoor radiation data of each thermal resistor (6) measurement point hourly, and transmit the data to the master control computer (14).

9. A spray cooling and ventilated double-layer glass curtain wall test method, based on a spray cooling and ventilated double-layer glass curtain wall test bench according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Before the experiment begins, place the wind speed sensor (1) at the same level as the glass curtain wall, hang the temperature and humidity integrated instrument (2) outdoors where it is not exposed to direct sunlight, set the data collection time interval for the thermal resistor temperature value and the indoor and outdoor radiation values ​​through the data acquisition instrument (13), and set the data collection time interval for the outdoor temperature, humidity and wind speed through the master control computer (14); S2, setting the spray time, spray pressure, spray flow rate and number of open nozzles through the water pump control device (12); S3. At the beginning of the experiment, the baffle (20) is opened, the upper and lower vents are opened, the water pump (11) is turned on through the water pump control device (12), water flows through the nozzle (5) to spray from top to bottom, and data is collected through the data acquisition instrument (13) and the master control computer (14); S4, after the spraying is finished, the water pump (11) and the baffle (20) are turned off, and the collected data are summarized, thereby completing the spray cooling and ventilated double-layer glass curtain wall heat transfer characteristic experiment.

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