Large-space plant temperature and humidity adjusting system and method

Abstract

The invention relates to a temperature and humidity adjusting system, in particular to a large-space plant temperature and humidity adjusting system and method, and solves the problem that when an existing air conditioning system is used in a large-space plant and operates in an extreme environment, more energy needs to be consumed to maintain the needed output temperature, and consequently energy consumption is greatly increased. The system comprises an air return pipeline, a fresh air pipeline, a plenum chamber and an air conditioning unit, a plurality of air conditioning units are arranged, and the static pressure box is connected with the air conditioning units; one end of the air return pipeline is connected to the static pressure box, and the other end of the air return pipeline is located in the plant; one end of the fresh air pipeline is connected to the static pressure box, and the other end of the fresh air pipeline is located outside the plant; adjusting valves are arranged in the air return pipeline and the fresh air pipeline respectively, a temperature and humidity sensor is arranged in the fresh air pipeline, the temperature and humidity sensor is located on the outer side of the corresponding adjusting valve and outside the plant, flow meters are arranged in the air return pipeline and the fresh air pipeline, and the flow meters are located between the adjusting valves and the static pressure box.

Description

Technical Field

[0001] The present invention relates to a temperature and humidity regulation system, and particularly to a temperature and humidity regulation system and method for a large-space factory building. Background Art

[0002] At present, many large-space factory buildings for storing chemicals, foods, medicines, etc. need to maintain a stable temperature and humidity environment to ensure the quality and safety of the stored items. Since the goods stored in these factory buildings are easily damaged or invalidated due to temperature and humidity fluctuations in the factory building, in order to ensure the quality and safety of the stored items, an air-conditioning system is required to provide a constant temperature and humidity environment. The air-conditioning system can control factors such as indoor temperature, humidity, and air circulation, and can also be adjusted according to different requirements to maintain a stable indoor environment. Therefore, large-space factory buildings generally install an air-conditioning system for temperature and humidity control. However, due to the complexity of large-space factory buildings, the operation of their air-conditioning systems consumes a huge amount of energy, and the intake air of the air-conditioning system is all carried out outside the factory building. When the air-conditioning system operates in extreme ambient temperatures, it may cause the output temperature of the air-conditioning to fail or not reach the expected effect. This is because the working principle and design of the air-conditioning system are usually based on adapting to a certain range of ambient temperatures. When the ambient temperature exceeds this range, the performance of the system may be limited. At this time, the air-conditioning system needs to consume more energy to maintain the required output temperature, which will lead to a significant increase in energy consumption. Summary of the Invention

[0003] The object of the present invention is to solve the technical problem that when the existing air-conditioning system is used in a large-space factory building and operates in an extreme environment, it needs to consume more energy to maintain the required output temperature, resulting in a significant increase in energy consumption, and to provide a temperature and humidity regulation system and method for a large-space factory building.

[0004] In order to solve the above-mentioned deficiencies of the existing technology, the present invention provides the following technical solutions:

[0005] A temperature and humidity regulation system for a large-space factory building, characterized in that: it includes a return air duct, a fresh air duct, a static pressure box, and an air-conditioning unit;

[0006] A plurality of the air-conditioning units are provided, and the static pressure box is connected to each air-conditioning unit;

[0007] At least one return air duct is provided, one end of the return air duct is connected to the static pressure box, and the other end is located inside the factory building;

[0008] At least one fresh air duct is provided, one end of the fresh air duct is connected to the static pressure box, and the other end is located outside the factory building;

[0009] A regulating valve is respectively arranged in the return air duct and the fresh air duct to regulate the air volume; a temperature and humidity sensor is arranged in the fresh air duct, and the temperature and humidity sensor is located on the side of the corresponding regulating valve and outside the factory building; a flow meter is respectively arranged in the return air duct and the fresh air duct, and the flow meter is located between the regulating valve and the static pressure box.

[0010] Further, a temperature and humidity sensor is arranged in the return air duct, and the temperature and humidity sensor is located outside the corresponding regulating valve for detecting the temperature and humidity of the return air.

[0011] Further, the number of the return air ducts is M; the number of the fresh air ducts is N, and the number of the air handling units is S; M + N air inlets and one air outlet are arranged on the static pressure box, a mixing air duct is connected to the air outlet, and the mixing air duct is respectively connected to the air inlets of each air handling unit through S connecting pipes; the number of the air inlets is equal to the sum of the numbers of the return air ducts and the fresh air ducts, wherein M air inlets are connected to the return air ducts and N air inlets are connected to the fresh air ducts.

[0012] Further, an air velocity transmitter and a temperature and humidity sensor are arranged in the connecting pipe; an air velocity transmitter is also arranged in the return air duct, and the air velocity transmitter in the return air duct is located between the regulating valve and the air inlet for measuring the return air velocity entering the static pressure box.

[0013] Further, the static pressure box, the return air duct, the fresh air duct and the air handling unit are all installed on the top of the factory building.

[0014] Further, the regulating valve is a multi-stage opening regulating valve; an insect-proof net is arranged at one end of the return air duct not connected to the air inlet, and filter nets are arranged on both the return air inlet and the fresh air inlet; a heat preservation layer is coated on the outer wall of the return air duct.

[0015] The present invention also provides a temperature and humidity regulation method for a large-space factory building, adopting the above temperature and humidity regulation system for a large-space factory building, and the special feature lies in that it includes the following control modes:

[0016] Control mode A: When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is -10°C < T ≤ 5°C, the regulating valves in the return air duct and the fresh air duct are respectively adjusted according to the readings of the flow meters in the return air duct and the fresh air duct, so that the return air volume input from the return air duct accounts for 45 - 50% of the total air volume input into the static pressure box, the fresh air input into the static pressure box from the fresh air duct is mixed with the return air input from the return air duct in the static pressure box, the fresh air is preheated by the heat of the return air, and then output to each air handling unit;

[0017] Control Mode B: When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is greater than 40%, according to the readings of the flow meters in the return air duct and the fresh air duct, the regulating valves in the return air duct and the fresh air duct are adjusted respectively, so that the return air volume input from the return air duct accounts for 45 - 50% of the total air volume in the static pressure box. The fresh air input into the static pressure box from the fresh air duct is mixed with the return air input from the return air duct in the static pressure box, and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioning unit;

[0018] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is less than or equal to 40%, according to the readings of the flow meters in the return air duct and the fresh air duct, the regulating valves in the return air duct and the fresh air duct are adjusted respectively, so that the return air volume input from the return air duct accounts for 35 - 40% of the total air volume in the static pressure box. The fresh air input into the static pressure box from the fresh air duct is mixed with the return air input from the return air duct in the static pressure box, and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioning unit;

[0019] Control Mode C: When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is greater than 40%, according to the readings of the flow meters in the return air duct and the fresh air duct, the regulating valves in the return air duct and the fresh air duct are adjusted respectively, so that the return air volume input from the return air duct accounts for 45 - 50% of the total air volume in the static pressure box. The fresh air input into the static pressure box from the fresh air duct is mixed with the return air input from the return air duct in the static pressure box, and the cold of the return air is used to precool the fresh air, and then it is output to each air conditioning unit;

[0020] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is less than or equal to 40%, according to the readings of the flow meters in the return air duct and the fresh air duct, the regulating valves in the return air duct and the fresh air duct are adjusted respectively, so that the return air volume input from the return air duct accounts for 35 - 40% of the total air volume in the static pressure box. The fresh air input into the static pressure box from the fresh air duct is mixed with the return air input from the return air duct in the static pressure box, and the cold of the return air is used to precool the fresh air, and then it is output to each air conditioning unit;

[0021] Control Mode D: When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 10°C < T ≤ 35°C, only the fresh air input into the static pressure box from the fresh air duct is output to each air conditioning unit.

[0022] Furthermore, when the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is -10°C < T ≤ 5°C, the return air volume input from the return air duct accounts for 50% of the total air volume input into the static pressure box;

[0023] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is greater than 40%, the return air volume input from the return air duct accounts for 50% of the total air volume in the input static pressure box;

[0024] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct accounts for 40% of the total air volume in the input static pressure box;

[0025] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is greater than 40%, the return air volume input from the return air duct accounts for 50% of the total air volume in the input static pressure box;

[0026] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct accounts for 40% of the total air volume in the input static pressure box.

[0027] Furthermore, the control method D can also adopt the following method:

[0028] Control method D1: When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is greater than 40%, according to the flowmeter readings in the return air duct and the fresh air duct, adjust the regulating valves in the return air duct and the fresh air duct respectively, so that the return air volume input from the return air duct accounts for 25 - 30% of the total air volume in the static pressure box. Mix the fresh air input from the fresh air duct into the static pressure box with the return air input from the return air duct, preheat the fresh air using the heat of the return air, and then output it to each air conditioning unit;

[0029] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is less than or equal to 40%, according to the flowmeter readings in the return air duct and the fresh air duct, adjust the regulating valves in the return air duct and the fresh air duct respectively, so that the return air volume input from the return air duct accounts for 15 - 20% of the total air volume in the static pressure box. Mix the fresh air input from the fresh air duct into the static pressure box with the return air input from the return air duct, preheat the fresh air using the heat of the return air, and then output it to each air conditioning unit;

[0030] Control method D2: When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is greater than 40%, according to the flowmeter readings in the return air duct and the fresh air duct, adjust the regulating valves in the return air duct and the fresh air duct respectively, so that the return air volume input from the return air duct accounts for 25 - 30% of the total air volume in the static pressure box. Mix the fresh air input from the fresh air duct into the static pressure box with the return air input from the return air duct, precool the fresh air using the cold of the return air, and then output it to each air conditioning unit;

[0031] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the workshop is 25°C < T ≤ 35°C and the humidity is less than or equal to 40%, according to the readings of the flow meters in the return air duct and the fresh air duct, the regulating valves in the return air duct and the fresh air duct are adjusted respectively, so that the return air volume input from the return air duct accounts for 15 - 20% of the total air volume in the static pressure box. The fresh air input into the static pressure box from the fresh air duct is mixed with the return air input from the return air duct in the static pressure box, and the cold quantity of the return air is used to pre-cool the fresh air, and then it is output to each air conditioning unit.

[0032] Further, when the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the workshop is 10°C < T ≤ 25°C and the humidity is greater than 40%, the return air volume input from the return air duct accounts for 30% of the total air volume in the static pressure box;

[0033] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the workshop is 10°C < T ≤ 25°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct accounts for 20% of the total air volume in the static pressure box;

[0034] When the temperature and humidity sensor in the fresh air duct detects that the ambient temperature outside the workshop is 25°C < T ≤ 35°C and the humidity is greater than 40%, the return air volume input from the return air duct accounts for 30% of the total air volume in the static pressure box;

[0035] When the temperature and humidity sensor (6) in the fresh air duct detects that the ambient temperature outside the workshop is 25°C < T ≤ 35°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct accounts for 20% of the total air volume in the static pressure box.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] (1) A temperature and humidity regulation system for a large-space workshop provided by the present invention includes a return air duct, a fresh air duct, a static pressure box and an air conditioning unit. The temperature and humidity outside the workshop are detected by the temperature and humidity sensor in the fresh air duct, and then the ratio of the return air to the fresh air is controlled by the regulating valve and the return air volume and the fresh air volume are measured by the flow meter, so that the air conditioning unit can work in the best state. In this way, the original air intake mode of the air conditioning unit that simply absorbs fresh air from the outside is changed to the mode of return air + fresh air. The return air duct can recycle the air in the workshop, and then recycle the heat or cold quantity to reduce the dependence of the air conditioning unit on the outside air of the workshop. The fresh air in the static pressure box is preheated or pre-cooled by the recycled heat or cold quantity, reducing the energy consumption of the air conditioning unit.

[0038] (2) The large-space factory building temperature and humidity regulation method provided by the present invention adjusts the proportion of the return air volume at different temperatures and different humidities, and uses the heat or cold of the return air to preheat or precool the fresh air, so as to balance the inlet air temperature of the air conditioning unit, ensure the normal operation of the air conditioning unit, and reduce the excess energy consumption. Description of the Drawings

[0039] Figure 1 It is the schematic diagram of the embodiment of the large-space factory building temperature and humidity regulation system of the present invention;

[0040] Figure 2 It is the layout schematic diagram of the embodiment of the large-space factory building temperature and humidity regulation system of the present invention.

[0041] The description of the reference numerals is as follows:

[0042] 1 - return air duct, 2 - fresh air duct, 3 - static pressure box, 4 - air conditioning unit, 5 - regulating valve, 6 - temperature and humidity sensor, 7 - wind speed transmitter, 8 - flow meter, 9 - connecting pipe, 10 - mixing air duct, 11 - insect-proof net. Detailed Embodiment

[0043] The present invention will be further described below with reference to the drawings and exemplary embodiments.

[0044] Refer to Figure 1 - Figure 2 , a large-space factory building temperature and humidity regulation system of the present invention includes S air conditioning units 4, M return air ducts 1, N fresh air ducts 2 and a static pressure box 3. In this embodiment, there are three air conditioning units 4, two return air ducts 1, and two fresh air ducts 2.

[0045] All three air conditioning units 4 are installed on the top of the factory building. A static pressure box 3 is also provided on the top of the factory building. The static pressure box 3 is mainly used for mixing the return air and the fresh air to ensure that the temperature of the mixed gas entering each air conditioning unit 4 is uniform and each air conditioning unit is in the best working state. Therefore, an air inlet and an air outlet are opened on the static pressure box 3, and the air outlet is used to connect with the air conditioning unit 4. However, there are three air conditioning units 4. If three air outlets are opened on the static pressure box 3 to connect with the air conditioning units 4 respectively, it will cause too many holes on the whole static pressure box 3 and affect the overall strength of the static pressure box 3. Therefore, only one air outlet is opened, and a mixing air duct 10 is connected to the air outlet. Connecting pipes 9 are respectively arranged on the air inlets of the three air conditioning units 4, and each connecting pipe 9 is respectively connected to the mixing air duct 10. In this way, not only the structural strength of the static pressure box 3 is ensured, but also the mixed gas in the static pressure box 3 can continue to mix when passing through the mixing air duct 10, making the temperature of the mixed gas more uniform.

[0046] The air inlet on the static pressure box 3 is provided with four openings, two of which are used to connect with the return air duct 1 installed on the top of the factory building, and the other two are used to connect with the fresh air duct 2 installed on the top of the factory building. The return air duct 1 is used to collect the air in the factory building, so the end that is not connected to the static pressure box 3 is located inside the factory building. In this way, the air conditioner unit 4, the static pressure box 3, the return air duct 1 and the fresh air duct 2 are all installed on the top of the factory building, making use of the vertical height of the factory building and not occupying the storage area of the factory building. The return air duct 1 can also be used as the power for the air circulation and convection in the factory building to ensure air flow. A heat preservation layer is coated on the outer wall of the return air duct 1 to insulate the return air in the return air duct 1 and reduce heat loss. The fresh air duct 2 is used to supply fresh air from the outside to the air conditioner unit 4, so the end that is not connected to the static pressure box 3 is located outside the factory building. In order to adjust the ratio of the return air to the fresh air in the static pressure box 3 so that the air conditioner unit 4 can work in the best state, a regulating valve 5 is set in each of the return air duct 1 and the fresh air duct 2. The regulating valve 5 adopts a multi-stage opening regulating valve, which can more accurately control the mixing ratio.

[0047] In order to detect the temperature and humidity outside the factory building, a temperature and humidity sensor 6 is set in the fresh air duct 2, and the temperature and humidity sensor 6 is set outside the regulating valve 5 and outside the factory building. This avoids the influence of the regulating valve 5 on the temperature and humidity sensor 6 and makes the measurement result more accurate. A temperature and humidity sensor 6 is also set in the return air duct 1. Similar to the fresh air duct 2, in order to eliminate the influence of the regulating valve 5 on the temperature and humidity sensor 6, the temperature and humidity sensor in the return air duct 1 is also correspondingly set outside the regulating valve 5.

[0048] A wind speed transmitter 7 is also set in the return air duct 1. The wind speed transmitter 7 is located between the regulating valve 5 and the air inlet, and can measure the wind speed of the return air entering the static pressure box 3. A wind speed transmitter 7 is also set in the connecting pipe 9 to measure the wind speed of the mixed gas entering the air conditioner unit 4. And temperature and humidity sensors 6 are also set in the three connecting pipes 9 to further detect the temperature and humidity of the mixed gas entering the air conditioner unit 4.

[0049] In order to prevent flying insects in the factory building from entering the return air duct 1 and then damaging the regulating valve 5, an insect-proof net 11 is set at the end of the return air duct 1 that is not connected to the air inlet, and filter meshes are set on the air inlets of the static pressure box 3 to filter dust and sand, etc., to ensure that the mixed air entering each air conditioner unit 4 does not carry dust and sand, so that the air conditioner unit 4 will not be damaged.

[0050] When the inlet air temperature of the commonly used air conditioner in the market is above 4°C, the overall working state is relatively good, and the air conditioner basically has no alarm situation. Through the data analysis of the air conditioner situation, the working condition of the air conditioner in summer is basically stable. However, in extreme high temperature conditions (>35°C) and when the external environmental humidity is relatively high, when the indoor temperature exceeds 25°C, due to the large temperature difference between the outdoor environmental temperature and the air conditioning refrigeration temperature, and the humidity is also relatively high at this time, it is easy to cause the evaporator of the air conditioner to frost, and the system refrigeration efficiency will drop sharply. Similarly, in winter, when the environmental temperature remains low (-10 to 10°C) for a long time and the humidity is relatively high, it is also easy to cause the evaporator to frost, the compressor to work overload, and the heating temperature to not reach the set value. There may be flammable and toxic rocket propellant media, chemical products, etc. stored in the large-space workshop. Therefore, the concentration of propellant media or chemical products in the indoor air cannot be too high to ensure the indoor air quality and maintain a safe environment. And the maximum return air volume cannot exceed 50% of the total air volume in the static pressure box 3 for the following two reasons. Reason 1: Pressure difference: There will be a pressure difference between the outdoor air and the indoor air in the workshop. If the return air volume is too large, a lower static pressure will be formed in the workshop, and the outdoor air may enter the workshop through open doors and windows, cracks or other ventilation openings. If the temperature and humidity difference between the outdoor air and the indoor air is too large at this time, it will cause the temperature and humidity environment in the workshop to be damaged. Reason 2: It will cause a mixing effect. Too large a return air volume may cause violent turbulence of the air in the workshop, and it will also damage the temperature and humidity environment in the workshop.

[0051] Therefore, the present invention also provides a method for adjusting the temperature and humidity in a large-space workshop, including the following control methods:

[0052] Control method A: When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the outdoor environmental temperature of the workshop is -10°C < T ≤ 5°C, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input from the return air duct 1 accounts for 45-50% of the total air volume input into the static pressure box 3. The fresh air input into the static pressure box 3 from the fresh air duct 2 is mixed with the return air input from the return air duct 1 in the static pressure box 3, and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioner unit 4;

[0053] Control method B: When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the outdoor environmental temperature of the workshop is 5°C < T ≤ 10°C and the humidity is greater than 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input from the return air duct 1 accounts for 45-50% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 from the fresh air duct 2 is mixed with the return air input from the return air duct 1 in the static pressure box 3, and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioner unit 4;

[0054] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is less than or equal to 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input from the return air duct 1 accounts for 35 - 40% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 from the fresh air duct 2 is mixed with the return air input from the return air duct 1 in the static pressure box 3, and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioning unit 4;

[0055] Control mode C: When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is greater than 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input from the return air duct 1 accounts for 45 - 50% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 from the fresh air duct 2 is mixed with the return air input from the return air duct 1 in the static pressure box 3, and the cold of the return air is used to precool the fresh air, and then it is output to each air conditioning unit 4;

[0056] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is less than or equal to 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input from the return air duct 1 accounts for 35 - 40% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 from the fresh air duct 2 is mixed with the return air input from the return air duct 1 in the static pressure box 3, and the cold of the return air is used to precool the fresh air, and then it is output to each air conditioning unit 4;

[0057] Control mode D: When the temperature and humidity sensor 6 in the fresh air duct 4 detects that the ambient temperature outside the factory building is 10°C < T ≤ 35°C, only the fresh air input into the static pressure box 3 from the fresh air duct 2 is output to each air conditioning unit 4.

[0058] Specifically, in this embodiment, when the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is -10°C < T ≤ 5°C, the return air volume input from the return air duct 1 accounts for 50% of the total air volume input into the static pressure box 3;

[0059] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is greater than 40%, the return air volume input from the return air duct 1 accounts for 50% of the total air volume input into the static pressure box 3;

[0060] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct 1 accounts for 40% of the total air volume input into the static pressure box 3;

[0061] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the workshop is greater than 35°C and the humidity is greater than 40%, the return air volume input by the return air duct 1 accounts for 50% of the total air volume in the input static pressure box 3;

[0062] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the workshop is greater than 35°C and the humidity is less than or equal to 40%, the return air volume input by the return air duct 1 accounts for 40% of the total air volume in the input static pressure box 3.

[0063] Since the ambient temperature outside the workshop is 10°C < T ≤ 35°C, the temperature is suitable, and all the fresh air can be used as the intake air of the air conditioner unit 4. However, considering the influence of humidity on the indoor environment of the workshop, the control method D of the present invention can also adopt the following method:

[0064] Control method D1: When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the workshop is 10°C < T ≤ 25°C and the humidity is greater than 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input by the return air duct 1 accounts for 25 - 30% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 by the fresh air duct 2 and the return air input by the return air duct 1 are mixed in the static pressure box 3, and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioner unit 4;

[0065] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the workshop is 10°C < T ≤ 25°C and the humidity is less than or equal to 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input by the return air duct 1 accounts for 15 - 20% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 by the fresh air duct 2 and the return air input by the return air duct 1 are mixed in the static pressure box 3, and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioner unit 4;

[0066] Control method D2: When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the workshop is 25°C < T ≤ 35°C and the humidity is greater than 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input by the return air duct 1 accounts for 25 - 30% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 by the fresh air duct 2 and the return air input by the return air duct 1 are mixed in the static pressure box 3, and the cold of the return air is used to precool the fresh air, and then it is output to each air conditioner unit 4;

[0067] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is less than or equal to 40%, according to the readings of the flow meters 8 in the return air duct 1 and the fresh air duct 2, the regulating valves 5 in the return air duct 1 and the fresh air duct 2 are respectively adjusted so that the return air volume input from the return air duct 1 accounts for 15 - 20% of the total air volume in the static pressure box 3. The fresh air input into the static pressure box 3 from the fresh air duct 2 is mixed with the return air input from the return air duct 1 in the static pressure box 3, and the cold quantity of the return air is used to precool the fresh air, and then it is output to each air conditioning unit 4.

[0068] Specifically, in this embodiment, when the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is greater than 40%, the return air volume input from the return air duct 1 accounts for 30% of the total air volume in the static pressure box 3;

[0069] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct 1 accounts for 20% of the total air volume in the static pressure box 3;

[0070] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is greater than 40%, the return air volume input from the return air duct 1 accounts for 30% of the total air volume in the static pressure box 3;

[0071] When the temperature and humidity sensor 6 in the fresh air duct 2 detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct 1 accounts for 20% of the total air volume in the static pressure box 3.

[0072] The control principle of the present invention is as follows:

[0073] In control mode A, at this time, the ambient temperature outside the factory building is -10°C < T ≤ 5°C. It is difficult for the evaporator of the air conditioning unit 4 to absorb heat energy from the air outside the factory building. At this temperature, the influence of the external environment temperature on the air conditioning unit 4 is greater than that of the humidity. Therefore, the regulating valves 5 in the two fresh air ducts 2 and the two return air ducts 1 are adjusted so that the return air volume in the two return air ducts 1 accounts for 45 - 50% of the total air volume in the static pressure box 3. Since the return air is recycled from inside the factory building, its temperature is higher than that of the fresh air. In this way, the heat of the return air can be used to preheat the fresh air to the greatest extent, reduce the heat exchange loss of the fresh air, improve the heating efficiency of the entire air conditioning unit 4, and save energy consumption.

[0074] In control mode B, when the ambient temperature outside the plant is 5°C < T ≤ 10°C and the humidity is greater than 40%, the humidity is relatively high at this time and the temperature is not high either, which easily causes the evaporator of the air conditioner unit 4 to frost. Therefore, the return air volume in the two return air ducts 1 is adjusted so that the return air volume accounts for 45 - 50% of the total air volume in the static pressure box 3. This can limit the fresh air intake to the greatest extent and avoid the influence of the external humidity of the plant on the internal humidity of the plant. When the humidity is less than or equal to 40%, the influence of the external environment humidity on the humidity inside the plant is relatively small. At this time, the proportion of the return air volume is regulated so that it accounts for 35 - 40% of the total air volume in the static pressure box 3. In this way, the heat of the return air can provide heat for the evaporator of the air conditioner unit 4, and the remaining heat can provide preheating for the condenser of the air conditioner unit 4, maximizing the heating efficiency.

[0075] In control mode C, at this time, the external temperature has reached above 35°C and the environmental humidity is greater than 40%, which belongs to an extremely high temperature and high humidity environment. Therefore, the return air volume in the two return air ducts 1 is adjusted to 45 - 50% of the total air volume in the static pressure box 3, limiting the fresh air intake to the greatest extent. When the environmental humidity is less than or equal to 40%, considering the problems of the storage medium concentration and air quality inside the plant, the return air volume is adjusted to 35 - 40% of the total air volume. Because the temperature difference between the fresh air temperature and the refrigeration temperature of the air conditioner unit 4 is very large at this time, the cold air of the return air can be used to pre-cool the fresh air to the greatest extent.

[0076] In control mode D1, when the temperature outside the plant is 10°C < T ≤ 25°C and the humidity is greater than 40%, the return air volume in the two return air ducts 1 is adjusted so that it accounts for 25 - 30% of the total air volume in the static pressure box 3. Because the fresh air temperature in the external environment is appropriate at this time, but the humidity is relatively high, the return air volume is adjusted to 25 - 30% of the total air volume, thereby limiting the fresh air volume and preventing the external environment humidity from affecting the humidity environment inside the plant. When the external environment humidity is less than or equal to 40%, the return air volume is regulated to account for 15 - 20% of the total air volume. At this time, the fresh air temperature in the external environment meets the working temperature of the air conditioner unit 4, so the fresh air will be introduced to the greatest extent.

[0077] In control mode D2, when the external environmental temperature is 25°C < T ≤ 35°C and the environmental humidity is greater than 40%, the return air volume in the two return air ducts 1 is adjusted to 25 - 30% of the total air intake volume in the static pressure box 3, restricting the fresh air intake volume to prevent the influence of external humidity on the humidity in the workshop. When the external environmental humidity is less than or equal to 40%, considering the concentration of storage media and air quality problems in the workshop, the return air volume is adjusted to 15 - 20% of the total air intake volume. At this time, the air conditioning unit 4 is in a refrigeration state, and the cold air of the return air can be fully used to pre-cool the fresh air, reducing the gradient between the temperature of the fresh air entering from the outside and the refrigeration temperature, alleviating the frosting problem. At the same time, because the fresh air is pre-cooled, the operating power consumption of the variable frequency compressor in the air conditioning unit 4 is also reduced, reducing energy consumption and improving the refrigeration efficiency.

[0078] The above-described embodiments are only descriptions of the specific implementation manners of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A temperature and humidity control system for a large-space workshop, characterized in that: It includes a return air duct (1), a fresh air duct (2), a static pressure box (3), and an air conditioning unit (4); There are multiple air conditioning units (4) provided, and the static pressure box (3) is connected to each air conditioning unit (4); There is at least one return air duct (1). One end of the return air duct (1) is connected to the static pressure box (3), and the other end is located inside the factory building; There is at least one fresh air duct (2). One end of the fresh air duct (2) is connected to the static pressure box (3), and the other end is located outside the factory building; Regulating valves (5) are respectively arranged in the return air duct (1) and the fresh air duct (2) for regulating the air volume. A temperature and humidity sensor (6) is arranged in the fresh air duct (2). The temperature and humidity sensor (6) is located outside the corresponding regulating valve (5) and outside the factory building. Flow meters (8) are respectively arranged in the return air duct (1) and the fresh air duct (2). The flow meters (8) are located between the regulating valve (5) and the static pressure box (3).

2. The large-space factory building temperature and humidity regulation system according to claim 1, wherein: A temperature and humidity sensor (6) is arranged in the return air duct (1). The temperature and humidity sensor (6) is located outside the corresponding regulating valve (5) for detecting the return air temperature and humidity.

3. The large-space factory building temperature and humidity regulation system according to claim 2, characterized in that: The number of the return air ducts (1) is M. The number of the fresh air ducts (2) is N, and the number of the air conditioning units (4) is S. The static pressure box (3) is provided with M + N air inlets and one air outlet. A mixing air duct (10) is connected to the air outlet. The mixing air duct (10) is respectively connected to the air inlets of each air conditioning unit (4) through S connecting pipes (9). The number of the air inlets is equal to the sum of the numbers of the return air ducts (1) and the fresh air ducts (2). Among them, M air inlets are connected to the return air ducts (1), and N air inlets are connected to the fresh air ducts (2).

4. The large-space factory building temperature and humidity regulation system according to claim 3, characterized in that: A wind speed transmitter (7) and a temperature and humidity sensor (6) are arranged in the connecting pipe (9). A wind speed transmitter (7) is also arranged in the return air duct (1). The wind speed transmitter (7) in the return air duct (1) is located between the regulating valve (5) and the air inlet for measuring the return air speed entering the static pressure box (3).

5. The large-space factory building temperature and humidity regulation system according to any one of claims 1-4, characterized in that: The static pressure box (3), the return air duct (1), the fresh air duct (2), and the air conditioning unit (4) are all installed on the top of the factory building.

6. The large-space factory building temperature and humidity regulation system according to claim 5, characterized in that: The regulating valve (5) is a multi - gear opening regulating valve. An insect - proof net (11) is arranged at the end of the return air duct (1) that is not connected to the air inlet. Filter nets are arranged on all the air inlets. The outer wall of the return air duct (1) is coated with a heat - insulating layer.

7. A method for adjusting the temperature and humidity in a large-space workshop, which uses the large-space workshop temperature and humidity adjustment system as described in any one of claims 1-6, characterized in that, It includes the following control methods: Control method A: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is - 10℃ < T ≤ 5℃, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the regulating valves (5) in the return air duct (1) and the fresh air duct (2) are respectively adjusted so that the return air volume input from the return air duct (1) accounts for 45 - 50% of the total air volume input into the static pressure box (3). The fresh air input into the static pressure box (3) from the fresh air duct (2) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the heat of the return air is used to pre - heat the fresh air, and then it is output to each air conditioning unit (4); Control Mode B: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is greater than 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the regulating valves (5) in the return air duct (1) and the fresh air duct (2) are adjusted respectively, so that the return air volume input from the return air duct (1) accounts for 45 - 50% of the total air volume in the static pressure box (3). The fresh air input into the static pressure box (3) from the fresh air duct (2) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioning unit (4); When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is less than or equal to 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the regulating valves (5) in the return air duct (1) and the fresh air duct (2) are adjusted respectively, so that the return air volume input from the return air duct (1) accounts for 35 - 40% of the total air volume in the static pressure box (3). The fresh air input into the static pressure box (3) from the fresh air duct (2) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioning unit (4); Control Mode C: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is greater than 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the regulating valves (5) in the return air duct (1) and the fresh air duct (2) are adjusted respectively, so that the return air volume input from the return air duct (1) accounts for 45 - 50% of the total air volume in the static pressure box (3). The fresh air input into the static pressure box (3) from the fresh air duct (2) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the cold of the return air is used to precool the fresh air, and then it is output to each air conditioning unit (4); When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is less than or equal to 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the regulating valves (5) in the return air duct (1) and the fresh air duct (2) are adjusted respectively, so that the return air volume input from the return air duct (1) accounts for 35 - 40% of the total air volume in the static pressure box (3). The fresh air input into the static pressure box (3) from the fresh air duct (2) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the cold of the return air is used to precool the fresh air, and then it is output to each air conditioning unit (4); Control Mode D: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 10°C < T ≤ 35°C, only the fresh air input into the static pressure box (3) from the fresh air duct (2) is output to each air conditioning unit (4).

8. The method for regulating the temperature and humidity in a large - space factory building according to claim 7, characterized in that: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is -10°C < T ≤ 5°C, the return air volume input from the return air duct (1) accounts for 50% of the total air volume in the input static pressure box (3); When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is greater than 40%, the return air volume input from the return air duct (1) accounts for 50% of the total air volume in the input static pressure box (3); When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 5°C < T ≤ 10°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct (1) accounts for 40% of the total air volume in the input static pressure box (3); When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is greater than 40%, the return air volume input from the return air duct (1) accounts for 50% of the total air volume in the input static pressure box (3); When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is greater than 35°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct (1) accounts for 40% of the total air volume in the input static pressure box (3).

9. The method for adjusting the temperature and humidity in a large-space workshop according to claim 7, characterized in that, The control method D can also adopt the following method: Control method D1: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is greater than 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the regulating valves (5) in the return air duct (1) and the fresh air duct (2) are respectively adjusted so that the return air volume input from the return air duct (1) accounts for 25 - 30% of the total air volume in the static pressure box (3). The fresh air input from the fresh air duct (2) into the static pressure box (3) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioner unit (4); When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is less than or equal to 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the regulating valves (5) in the return air duct (1) and the fresh air duct (2) are respectively adjusted so that the return air volume input from the return air duct (1) accounts for 15 - 20% of the total air volume in the static pressure box (3). The fresh air input from the fresh air duct (2) into the static pressure box (3) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the heat of the return air is used to preheat the fresh air, and then it is output to each air conditioner unit (4); Control mode D2: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is greater than 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the control valves (5) in the return air duct (1) and the fresh air duct (2) are adjusted respectively, so that the return air volume input from the return air duct (1) accounts for 25 - 30% of the total air volume in the static pressure box (3). The fresh air input into the static pressure box (3) from the fresh air duct (2) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the fresh air is precooled by the cooling capacity of the return air, and then output to each air conditioning unit (4). When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is less than or equal to 40%, according to the readings of the flow meters (8) in the return air duct (1) and the fresh air duct (2), the control valves (5) in the return air duct (1) and the fresh air duct (2) are adjusted respectively, so that the return air volume input from the return air duct (1) accounts for 15 - 20% of the total air volume in the static pressure box (3). The fresh air input into the static pressure box (3) from the fresh air duct (2) is mixed with the return air input from the return air duct (1) in the static pressure box (3), and the fresh air is precooled by the cooling capacity of the return air, and then output to each air conditioning unit (4).

10. The large-space factory building temperature and humidity adjustment method according to claim 9, characterized in that: When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is greater than 40%, the return air volume input from the return air duct (1) accounts for 30% of the total air volume in the static pressure box (3). When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 10°C < T ≤ 25°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct (1) accounts for 20% of the total air volume in the static pressure box (3). When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is greater than 40%, the return air volume input from the return air duct (1) accounts for 30% of the total air volume in the static pressure box (3). When the temperature and humidity sensor (6) in the fresh air duct (2) detects that the ambient temperature outside the factory building is 25°C < T ≤ 35°C and the humidity is less than or equal to 40%, the return air volume input from the return air duct (1) accounts for 20% of the total air volume in the static pressure box (3).

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