CN116678049A - Central air-conditioning energy-saving method using distributed high-efficiency low-resistance filter system - Google Patents

Abstract

The invention discloses a centralized air-conditioning energy-saving method using a distributed high-efficiency low-resistance filter system, which includes the following steps: S1. The fresh air filter and the return air filter are distributed in modules, and the fresh air filter mainly filters the particulate matter entering the indoor air outside the room , including PM0.3, PM2.5, PM10 and dust. The return air filter mainly filters microorganisms in the indoor circulation, including viruses, bacteria, fungi, etc.; there is no filter inside the centralized air conditioning system. The invention adopts a high-efficiency low-resistance filter, the initial resistance, the average reduction, and the energy consumption are simultaneously reduced; the distribution can independently upgrade the fresh air filter level and the return air outlet filter level at the same time, to meet the needs of the prevention and control of the new crown epidemic, and the resistance change will not change with the filter level Linear rise; distributed installation, reducing the horizontal size of the unit, so that the space occupied by the machine room is small; the fresh air filter or return air filter can be maintained and replaced in sections, and maintenance does not need to stop.

Description

Centralized air-conditioning energy-saving method using distributed high-efficiency low-resistance filter system

technical field

The invention relates to the technical field of distributed air purification and centralized air-conditioning energy saving, in particular to a method for energy-saving centralized air-conditioning using a distributed high-efficiency low-resistance filter system.

Background technique

Large-scale centralized air-conditioning systems are the main means of heat exchange in large spaces such as commercial buildings, transportation hubs, and museum venues. Building energy conservation needs to start with the air-conditioning system to solve the problem of high energy consumption in the air-conditioning system.

The interior of the large-scale centralized air conditioning system is mainly composed of the air mixing section, the coarse-effect filter section, the medium-effect filter section, the surface cooling heat exchange section, other special function sections, and the air supply fan. The high-efficiency filter section is the guarantee of indoor air quality, and it can also avoid the effect of reducing the heat exchange efficiency caused by the accumulation of dust on the surface cooling heat exchange surface. The role of the filter section is becoming more and more obvious, and it is also the main means and method to avoid indoor cross-infection. Traditional The internal organization of the embedded filtering scheme is shown in Figure 1.

However, according to the latest air filter national standard GB/T14295-2019 index data, coarse effect + medium effect, at a head-on wind speed of about 2.5m/s, the initial resistance is relatively large, and as the accumulation of dust and particles increases, the resistance gradually increases. This leads to a gradual increase in system energy consumption. A method with high filtration efficiency and low resistance is the most direct way to solve energy consumption.

In addition, the original internal organization of the central air-conditioning system also has the following problems:

1. The unit of the centralized air conditioning system is too long, and the machine room occupies a large area;

2. Shutdown for maintenance and replacement has a great impact and needs to be shut down for replacement;

3. Fresh air pollution and return air pollution are different, and the same filter section cannot be used to solve the problem of fresh air return;

4. The return air pipeline cannot be effectively protected;

5. The frequency of replacement and maintenance is high, and the maintenance time and economic cost are high.

Contents of the invention

The purpose of the present invention is to solve the shortcomings in the prior art, and propose a centralized air-conditioning energy-saving method using a distributed high-efficiency low-resistance filter system.

In order to achieve the above object, the present invention adopts the following technical solutions:

The energy-saving method for centralized air-conditioning using a distributed high-efficiency low-resistance filter system includes the following steps;

S1. The fresh air filter and the return air filter are distributed in modules. The fresh air filter mainly filters the particulate matter entering the indoor air from outside, including PM0.3, PM2.5, PM10 and dust, and the return air filter mainly filters the indoor circulation. microorganisms, including viruses, bacteria, fungi, etc.; there is no filter inside the central air-conditioning system;

The fresh air filter is set at the front end of the fresh air inlet of the central air-conditioning system, and a filter with a high dust holding capacity is used to meet the existing standards. A coarse-effect + medium-effect filter is set. The coarse-effect filter is made of high-efficiency and low-resistance materials. Under the m/s head-on wind speed, the initial resistance is controlled within 50 Pa and the counting efficiency (particles ≥ 2.0 μm) is ≥ 10%. The medium-efficiency filter adopts a bag filter, and the medium-effect filter adopts a bag depth of 480mm -650mm bag filter, using the long bag depth to increase the amount of filter material while increasing the dust holding capacity and reducing the initial resistance and the average resistance of the same use time.

Preferably, a self-cleaning function water spray nozzle can be added to the coarse-effect filter, and the installation direction of the water spray nozzle and the direction of airflow flow are arranged in parallel and parallel. The large particles of dust accumulated on the surface are cleaned, and the sewage is introduced into the drain.

Preferably, the medium-efficiency filter can use a V-shaped filter, and fully utilizing the V-shaped filter can increase the amount of filter material used and reduce structural resistance to ensure filtration efficiency while reducing initial resistance and average resistance to achieve high efficiency and low cost. resistance.

Preferably, the medium-efficiency filter can be a blade filter, which takes advantage of the great material density of the blade filter to ensure filtration efficiency while reducing initial resistance and average resistance to achieve high efficiency and low resistance.

Preferably, the return air filter is arranged at the return air outlet of the return air section of the centralized air conditioning system, and the return air filter can be made of high-efficiency and low-resistance materials to ensure filtration efficiency while reducing initial resistance and average resistance.

Preferably, the return air filter can adopt a V-shaped filter, and fully utilizing the V-shaped filter can increase the amount of filter material used and reduce the structural resistance to ensure the filtration efficiency while reducing the initial resistance and the average resistance, so as to achieve high efficiency and low resistance.

Preferably, the return air filter can be a blade filter, which takes advantage of the great material density of the blade filter to ensure the filtration efficiency while reducing the initial resistance and the average resistance, so as to achieve high efficiency and low resistance.

Preferably, the return air filter can achieve high efficiency and low resistance by increasing the ventilation cross-section and reducing the frontal wind speed. The size of the frontal cross-section is doubled, the ventilation wind speed is reduced to about 1.25m/s, and the resistance can be reduced to Corresponding to about 40% of the resistance at a head-on wind speed of 2.5m/s.

Preferably, while the return air filter satisfies the efficiency index, its initial resistance is ≤80Pa at a head-on wind speed of 1.25m/s.

The present invention has the following beneficial effects:

1. High-efficiency and low-resistance filter is adopted, the initial resistance and average decrease, and the energy consumption is simultaneously reduced.

2. Distributed can upgrade the fresh air filter level and return air outlet filter level separately. At the same time, the resistance change will not increase linearly with the filter level.

3. Distributed installation, reducing the horizontal size of the unit, so that the machine room occupies a small area.

4. The fresh air filter or return air filter can be maintained and replaced in sections, and the maintenance does not need to stop.

5. Fully avoid the pollution of the return air pipeline and the secondary pollution of the centralized air conditioning system.

6. According to the different use environments of fresh air and return air, select filters with different functions to increase the service life of the filter element, increase the replacement cycle of the filter, reduce the frequency of replacement, and save maintenance costs.

Description of drawings

Fig. 1 is a schematic structural diagram of the internal organization of a traditional embedded filtering solution;

Fig. 2 is a structural schematic diagram of a distributed high-efficiency low-resistance filter system in the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

Referring to Fig. 2, the centralized air-conditioning energy-saving method using a distributed high-efficiency low-resistance filter system includes the following steps;

S1. The fresh air filter and the return air filter are distributed in modules. The fresh air filter mainly filters the particulate matter entering the indoor air from outside, including PM0.3, PM2.5, PM10 and dust, and the return air filter mainly filters the indoor circulation. microorganisms, including viruses, bacteria, fungi, etc.; there is no filter inside the central air-conditioning system;

The fresh air filter is set at the front end of the fresh air inlet of the centralized air conditioning system, and a filter with a high dust holding capacity is used to meet the existing standards. A coarse-efficiency + medium-efficiency filter is set. The coarse-effect filter is made of high-efficiency and low-resistance materials. Under the wind speed, the initial resistance is controlled within 50Pa and the counting efficiency (particles ≥ 2.0μm) is ≥ 10%. Further, it meets the C3 of the national standard GB/T14295-2019, and the coarse efficiency configuration of the environment with higher requirements is C4, that is ( Particles ≥ 2.0 μm) counting efficiency ≥ 50%.

The medium effect filter adopts a bag filter, and the medium effect filter adopts a bag filter with a bag depth of 480mm-650mm. Using the long bag depth to increase the amount of filter material while increasing the dust holding capacity and reducing the initial resistance and reducing the same use Average resistance over time.

The coarse-effect filter can be equipped with a self-cleaning water spray nozzle. The setting direction of the water spray nozzle is parallel to the air flow direction. When the central air-conditioning system is not in use at night, it will automatically spray water to remove the large particles accumulated on the windward side of the coarse-effect filter. Dust is cleaned and sewage is introduced into the drain. This method can greatly reduce the frequency of maintenance of the filtration system and reduce the average resistance of the coarse effect.

The medium-efficiency filter can use a V-shaped filter. Making full use of the V-shaped filter can increase the amount of filter material used and reduce structural resistance to ensure filtration efficiency while reducing initial resistance and average resistance to achieve high efficiency and low resistance.

Medium-efficiency filters can use blade filters, taking advantage of the blade filter’s great material density to ensure filtration efficiency while reducing initial resistance and average resistance to achieve high efficiency and low resistance.

Further, the medium-efficiency filter meets the national standard GB/T14295-2019 (particles ≥ 0.5 μm) counting efficiency ≥ 40%, that is, meets the Z2 level, and the environment with higher requirements is configured as Z3, that is (particles ≥ 0.5 μm) counting Efficiency ≥ 60%, and under 2.5m/s head-on wind speed, initial resistance ≤ 80Pa.

The return air filter is set at the return air outlet of the return air section of the centralized air conditioning system, and the return air filter can be made of high-efficiency and low-resistance materials to ensure filtration efficiency while reducing initial resistance and average resistance.

The return air filter can use a V-shaped filter. Making full use of the V-shaped filter can increase the amount of filter material used and reduce the structural resistance to ensure the filtration efficiency while reducing the initial resistance and average resistance to achieve high efficiency and low resistance.

The blade filter can be used for the return air filter, which takes advantage of the great material density of the blade filter to ensure the filtration efficiency while reducing the initial resistance and average resistance to achieve high efficiency and low resistance.

The return air filter can achieve high efficiency and low resistance by increasing the ventilation section and reducing the frontal wind speed. The size of the frontal section is doubled, the ventilation wind speed is reduced to about 1.25m/s, and the resistance can be reduced to 2.5m/s. About 40% of the drag at head-on wind speed.

Furthermore, the return air filter meets the national standard GB/T14295-2019 (particles ≥ 0.5 μm) counting efficiency ≥ 40%, that is, it meets the Z2 level, and the efficiency configuration in the environment with higher requirements is Z3, that is (particles ≥ 0.5 μm) counting Efficiency ≥ 60%, and under 2.5m/s head-on wind speed, initial resistance ≤ 80Pa.

While the return air filter meets the efficiency index, its initial resistance is ≤80Pa under the head-on wind speed of 1.25m/s.

Compare the traditional traditional built-in filter with the distributed high-efficiency low-resistance filter proposed by the present invention below:

Calculate filter energy consumption (kWh/year) according to the formula in REC 4/21-2018:

Among them: qv——section wind speed, unit m ³ /s

△p——average resistance (average of initial resistance and final resistance), unit Pa

t——annual running time, generally 6000, unit h/a

η——conversion efficiency, η==0.5

Taking a 20,000m ³ /h central air-conditioning system as an example, the fresh air accounts for 30% (that is, 6000m ³ /h), and the return air accounts for 70% (that is, 14,000m ³ /h):

The comparison between the initial resistance and final resistance of the traditional built-in filter and the distributed high-efficiency low-resistance filter is as follows:

Benefits from using the REC 4/21-2018 plan:

According to the above analysis, the use of distributed high-efficiency low-resistance filtration can save 16950KW/year energy consumption, which is approximately equal to 0.85KW/(KW·m ³ /h).

The invention adopts a high-efficiency low-resistance filter, the initial resistance, the average reduction, and the energy consumption are simultaneously reduced; in addition, the distributed filter can independently upgrade the filter level of the fresh air and the filter level of the return air outlet, and the resistance change will not increase linearly with the filter level; at the same time, the distributed Installation, reducing the horizontal size of the unit, so that the space occupied by the machine room is small; and the fresh air filter or the return air filter can be maintained and replaced in sections, without shutting down for maintenance; fully avoiding the pollution of the return air pipeline and the secondary use of the central air conditioning system Pollution problems; in addition, according to the different use environments of fresh air and return air, filters with different functions can be selected to increase the service life of the filter element, increase the replacement cycle of the filter, reduce the frequency of replacement, and save maintenance costs.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solutions of the present invention and its Any equivalent replacement or change of the inventive concept shall fall within the protection scope of the present invention.

Claims (9)

1. The energy-saving method of the centralized air conditioner adopting the distributed high-efficiency low-resistance filtering system is characterized by comprising the following steps of;

s1, a fresh air filter and a return air filter are distributed in a split mode, wherein the fresh air filter mainly filters particulate matters in indoor air entering outdoors, wherein the particulate matters comprise PM0.3, PM2.5, PM10 and dust, and the return air filter mainly filters microorganisms in indoor circulation, such as viruses, bacteria and fungi; no filter is arranged in the centralized air conditioning system;

the fresh air filter is arranged at the front end of a fresh air inlet of a centralized air conditioning system, a filter with high dust holding capacity is adopted, the existing standard is met, a coarse effect filter and a medium effect filter are arranged, the coarse effect filter is made of high-efficiency low-resistance materials, the initial resistance is controlled within 50Pa and the counting efficiency (the particles are more than or equal to 2.0 mu m) is more than or equal to 10% at the windward speed of 2.5m/s, the medium effect filter is a bag filter with the bag depth of 480mm-650mm, the dust holding capacity is increased, the initial resistance is reduced, and the average resistance of the same service time is reduced while the consumption of the filter materials is increased by using a long bag.

2. The energy-saving method for the centralized air conditioner adopting the distributed high-efficiency low-resistance filtering system according to claim 1, wherein the coarse-effect filter can be added with a water spray nozzle with a self-cleaning function, the setting direction of the water spray nozzle and the flowing direction of the air flow are arranged in parallel, when the centralized air conditioner system is not used at night, water is automatically sprayed, large-particle dust accumulated on the windward side of the coarse-effect filter is cleaned, and sewage is led into a water outlet.

3. The energy-saving method for the centralized air conditioner adopting the distributed efficient low-resistance filtering system according to claim 1, wherein the medium-efficiency filter can adopt a V-shaped filter, and the high-efficiency low-resistance is realized by fully utilizing the functions of increasing the use amount of filtering materials and reducing structural resistance to ensure the filtering efficiency and simultaneously reducing initial resistance and average resistance.

4. The energy-saving method for the centralized air conditioner adopting the distributed high-efficiency low-resistance filtering system according to claim 1, wherein the medium-efficiency filter can adopt a blade filter, and the advantage of the maximum material density of the blade filter is utilized, so that the initial resistance and the average resistance are reduced while the filtering efficiency is ensured, and the high-efficiency low-resistance is realized.

5. The energy-saving method for the centralized air conditioner adopting the distributed efficient low-resistance filtering system according to claim 1, wherein the return air filter is arranged at a return air port of a return air section of the centralized air conditioner system, and the return air filter can adopt efficient low-resistance materials, so that the primary resistance and the average resistance are reduced while the filtering efficiency is ensured.

6. The energy-saving method for the centralized air conditioner adopting the distributed efficient low-resistance filtering system according to claim 1, wherein the return air filter can adopt a V-shaped filter, and the primary resistance and the average resistance are reduced while the filtering efficiency is ensured by fully utilizing the functions of increasing the use amount of filtering materials and reducing structural resistance of the V-shaped filter, so that the efficient low-resistance is realized.

7. The energy-saving method for the centralized air conditioner adopting the distributed efficient low-resistance filtering system according to claim 1, wherein the return air filter can adopt a blade filter, and the advantage of the maximum material density of the blade filter is utilized, so that the initial resistance and the average resistance are reduced while the filtering efficiency is ensured, and the efficient low-resistance is realized.

8. The energy-saving method for the centralized air conditioner adopting the distributed high-efficiency low-resistance filtering system according to claim 1, wherein the return air filter can achieve high efficiency and low resistance by increasing the ventilation cross section and reducing the head-on wind speed, the head-on cross section is increased by 1 time, the ventilation wind speed is reduced to about 1.25m/s, and the resistance can be reduced to about 40% of the resistance at the head-on wind speed corresponding to 2.5 m/s.

9. The energy-saving method for the centralized air conditioner adopting the distributed high-efficiency low-resistance filtering system according to claim 8, wherein the initial resistance of the return air filter is less than or equal to 80Pa at a head-on wind speed of 1.25m/s while the return air filter meets the efficiency index.