Water storage and drainage system of zero-carbon roof greening module

Abstract

The invention relates to a water storage and drainage system of a zero-carbon roof greening module. The method is suitable for the technical field of energy conservation and environmental protection. According to the technical scheme, the roof greening system comprises a roof greening module which is arranged on a building roof and can be used for storing water and planting plants; the roof drainage channel is arranged on the roof of the building; the installation position of the water storage tank is lower than the roof greening module and the roof drainage groove, and the water storage tank is communicated with the roof greening module through a water conveying pipe I provided with a control valve, communicated with the roof greening module through a water conveying pipe II provided with a water pump and communicated with the roof drainage groove through a water conveying pipe III provided with a filter screen assembly; the soil humidity detector is arranged in the roof greening module and used for collecting humidity data in the roof greening module; the control unit is in circuit connection with the soil humidity detector, the control valve and the water pump and can be used for controlling the control valve and the water pump to work based on the humidity data collected by the soil humidity detector.

Description

Technical Field

[0001] The invention relates to a water storage and drainage system of a zero-carbon roof greening module, which is applicable to the technical field of energy conservation and environmental protection. Background Art

[0002] With the acceleration of urbanization, the area of ​​urban green space is shrinking, and roof greening has become an effective way to make up for this deficiency. Roof greening not only beautifies the urban landscape, but also has significant ecological benefits, such as alleviating the urban heat island effect, improving air quality, promoting biodiversity, and rainwater management. However, the current storage and drainage system of roof greening modules has the following key problems:

[0003] 1. Management issues: The current water storage and drainage system mainly relies on absorbent cotton felt and water storage tanks, lacking precise water volume control mechanisms. In arid areas, frequent manual irrigation leads to waste of labor and water resources, and chemicals (such as chlorine) contained in irrigation water may have an adverse effect on plant growth.

[0004] 2. Drainage treatment issues: The existing drainage system only performs basic filtration and fails to effectively remove suspended matter, particles and organic matter. These impurities may cause blockage of the municipal drainage system, affect drainage efficiency, and even cause urban waterlogging.

[0005] 3. Later cost issues: The operation and maintenance costs of roof greening modules are high, especially in areas with uneven water distribution. Additional irrigation systems are required to cope with seasonal precipitation fluctuations, which further aggravates the cost burden. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in view of the above-mentioned problems, a water storage and drainage system for a zero-carbon roof greening module is provided.

[0007] The technical solution adopted by the present invention is: a water storage and drainage system of a zero-carbon roof greening module, characterized in that it includes:

[0008] Green roof modules, installed on the roof of a building, can be used to store water and grow plants;

[0009] Roof gutters are installed on the roof of a building;

[0010] A water storage tank, which is installed at a position lower than the roof greening module and the roof drainage trough. The water storage tank is connected to the roof greening module via a water delivery pipe I equipped with a control valve, connected to the roof greening module via a water delivery pipe II equipped with a water pump, and connected to the roof drainage trough via a water delivery pipe III equipped with a filter assembly;

[0011] A soil moisture detector is provided in the roof greening module and is used to collect moisture data in the roof greening module;

[0012] The control unit is connected to the soil moisture detector, the control valve and the water pump circuit, and can be used to control the operation of the control valve and the water pump based on the humidity data collected by the soil moisture detector.

[0013] The roof greening module includes at least one water storage planting trough module;

[0014] The water storage planting trough module comprises a module container, at least one water inlet and outlet is provided on the side wall of the module container, a water storage tank is provided at the bottom of the module container, a filter layer is provided above the water storage tank, and a lightweight planting base for planting plants is provided above the filter layer.

[0015] A water-absorbing cotton felt is also provided between the filter layer and the water storage tank.

[0016] A soil fixing grid is arranged above the lightweight planting base.

[0017] One or more of petunia, sedum, calendula, creeping cycad, zoysia grass, concave leaf sedum, golden leaf sedum and honeysuckle are planted on the light planting base.

[0018] The water storage tank is provided with an overflow port and a drain pipe, and both the overflow port and the drain pipe are connected to the municipal drainage network.

[0019] The water storage tank is connected to the household water pipeline.

[0020] A stainless steel filter screen and activated carbon filter cotton are arranged in the water storage tank.

[0021] Also includes:

[0022] The atmospheric condensation water collection device has a water outlet connected to the roof greening module via a water delivery pipe IV equipped with a control valve.

[0023] Also includes:

[0024] Photovoltaic power generation module is used to provide power for the water storage and drainage system.

[0025] The beneficial effect of the present invention is that the present invention ensures that the plants in the roof greening module obtain optimal moisture conditions through the cooperation of soil moisture detectors, control valves and water pumps, avoids excessive or insufficient irrigation, thereby saving water resources, reducing manpower input, and ensuring the healthy growth of plants.

[0026] In the present invention, rainwater on the roof enters the roof greening module and the roof drainage trough respectively. The roof greening module can filter the rainwater, and the rainwater collected by the roof drainage trough enters the water storage tank after passing through the filter mesh assembly, which can effectively intercept and remove suspended matter, particles and organic matter, prevent the municipal drainage system from being blocked, improve drainage efficiency, and avoid the risk of urban waterlogging.

[0027] The present invention provides clean electricity through photovoltaic power generation modules to meet the needs of all power-consuming devices in the system and achieve zero-carbon operation. The self-sufficiency of the storage and drainage system reduces the dependence on external water sources, especially in areas with uneven water distribution, and greatly reduces the additional cost of the irrigation system.

[0028] The present invention makes full use of rainwater and condensed water in the air, combines with photovoltaic power generation to achieve the recycling of water resources and energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a partial structural diagram of an embodiment.

[0030] Figure 2 It is a structural schematic diagram of the water storage planting tank module in the embodiment.

[0031] Figure 3 A system block diagram of an embodiment.

[0032] 1. Water storage planting tank module; 11. Module container; 12. Water storage tank; 13. Water-absorbing cotton felt; 14. Filter layer; 15. Lightweight planting base; 16. Soil-fixing grid;

[0033] 2. Soil moisture detector;

[0034] 3. Water storage tank; 31. Roof gutter;

[0035] 4. Photovoltaic power generation module; 41. Distribution box;

[0036] 5. Atmospheric condensation water collection device;

[0037] 6. Filter assembly;

[0038] 7. Control valve;

[0039] 8. Water pump;

[0040] 9. Household water pipes;

[0041] 10. Municipal drainage network. DETAILED DESCRIPTION

[0042] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0043] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0044] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0045] The present embodiment is a water storage and drainage system for a zero-carbon roof greening module, including: a roof greening module, a roof drainage trough, a water storage tank, a soil moisture detector, a control unit, an atmospheric condensation water collection device, and a photovoltaic power generation module.

[0046] In this example, the roof greening module is formed by splicing a number of water-storage planting trough modules laid on the roof of the building. The water-storage planting trough module has a module container, and at least one water inlet and outlet are opened on the side wall of the module container. The water-storage planting troughs are connected through the water inlet and outlet. A water storage tank is provided at the bottom of the module container, and water-absorbing cotton felt, a filter layer, a lightweight planting base and a soil-fixing grid are provided above the water storage tank in sequence. After rainwater enters the water-storage planting trough module from the soil-fixing grid, it passes through the lightweight planting base, the filter layer, and the water-absorbing cotton felt in sequence and then enters the water storage tank at the bottom. The water storage tank is connected to the outside through the water inlet and outlet on the side wall of the module container.

[0047] In this embodiment, ground cover plants are planted on the light planting base, such as one or more of Petunia, Sedum, Dianthus, Creeping Pennisetum, Zoysia, Sedum, Sedum, Honeysuckle. In this example, a specific ground cover plant combination can also be selected, such as Winter Jasmine + Big Leaf Philadelphus + Creeping Thyme or Dwarf Ophiopogon + Clover + Hosta, which not only beautifies the environment, but also has strong carbon fixation ability, pest and disease prevention ability, water storage ability, and the functions of promoting biodiversity and soil improvement, greatly enhancing the ecological contribution.

[0048] In this embodiment, the roof gutter is arranged on the roof of the building to collect rainwater on the roof and discharge it uniformly.

[0049] In this example, the installation position of the water tank is lower than the roof greening module and the roof drainage trough. The water tank is connected to the roof greening module through water pipes Ⅰ and Ⅱ. A control valve is installed on water pipe Ⅰ. The overflow water of the roof greening module is discharged to the water tank through water pipe Ⅰ. Water pipe Ⅱ is equipped with a water pump, which can pump the water in the water tank to the roof greening module.

[0050] In this embodiment, the water storage tank is connected to the roof gutter via the water delivery pipe III, and a filter assembly is provided on the water delivery pipe III. The rainwater collected in the roof gutter is filtered by the filter assembly and then enters the water storage tank.

[0051] In this example, the water storage tank is provided with an overflow port and a drain pipe, both of which are connected to the municipal drainage network, and the water storage tank is also connected to the household grey water pipeline.

[0052] In this example, in order to perform secondary filtration, a stainless steel filter mesh and activated carbon filter cotton are installed in the water tank, but other filter materials can certainly be used.

[0053] In this embodiment, the atmospheric condensation water collection device is installed at a position higher than the roof greening module. The water outlet of the atmospheric condensation water collection device is connected to the roof greening module through the water delivery pipe IV to supply water to the roof greening module. A control valve is installed on the water delivery pipe IV. In this example, the atmospheric condensation water collection device can be replaced by a dehumidifier, which absorbs excess moisture from the air and converts it into water droplets, which are then stored in a self-contained water tank, and can be used to replenish water for the roof greening module group when it is short of water.

[0054] In this embodiment, the control unit is connected to the soil moisture detector, the control valve and the water pump circuit, and can be used to control the operation of the control valve and the water pump based on the humidity data collected by the soil moisture detector.

[0055] In this embodiment, the photovoltaic power generation module supplies power to each power-consuming device in the water storage and drainage system, and the rated power generation power of the photovoltaic power generation module is greater than the total power of each power-consuming device. The photovoltaic power generation module uses the Huasheng HS-B144DS heterojunction photovoltaic module (HIT) with a distribution box.

[0056] When it rains, the roof greening module directs excess rainwater to the water storage tank through the water pipe I, and the roof gutter directs rainwater to the water storage tank through the water pipe III. The rainwater is filtered and intercepted by the filter assembly 6, and then filtered through two layers (the stainless steel filter and activated carbon filter cotton in the water storage tank) for storage. The water storage tank is equipped with an overflow port, and the water exceeding the storage capacity can be used as building grey water or discharged into the municipal drainage system.

[0057] The soil moisture required for plant growth is detected by a soil moisture detector embedded in the root system. When it is lower than 17% (the first threshold), the water pump is controlled to supply water to the plants. In areas with cold winters and hot summers, rainwater can be collected and recycled in the rainy season, and atmospheric condensation water collection devices can be used when there is insufficient precipitation in the dry season.

[0058] Therefore, in theory, when the water storage is greater than the drainage, the self-circulation of roof greening irrigation can be achieved. When it rains, the excess water is pressed into the water tank on the roof. When there is a lack of water, the water in the water tank is discharged into the roof greening module group under the control of the water potential gradient, and the water is automatically replenished through the capillary action of the soil, the water absorption of the plant roots, and the evaporation of the soil-plant. The drier the soil, the greater the water stress on the plants, and the stronger the capillary action of the soil near the roots of the plants. When using this system to replenish water, there is no need to increase the pressure, so the power consumption is very small, and there is no adverse effect such as increasing the head loss, and it will not cause soil compaction. It has broad application prospects.

[0059] In order to verify the feasibility of the roof greening module water storage and drainage system. Based on Example 1, an experimental verification was carried out on the roof of a factory workshop in Hangzhou, Zhejiang Province. The experimental address is Xiaoshan District, Hangzhou, Zhejiang Province; the total roof area is 1800 square meters, and the planned area of ​​the roof greening module is 900 square meters; the local climate is subtropical monsoon, with an average annual temperature of 18.2℃; the average annual precipitation is 1632.9mm, the air is humid, and the precipitation is unevenly distributed throughout the year.

[0060] The rooftop water storage and drainage system of the factory workshop uses photovoltaic power generation as the source of electricity supply. A factory workshop is located in Xiaoshan District, Hangzhou City, Zhejiang Province. The local annual radiation is 4796MJ / ㎡, which belongs to the third category of areas with sufficient radiation (data source: NASA), so it is feasible to build a photovoltaic power generation system.

[0061] Photovoltaic power generation converts solar energy into electrical energy to provide the required electricity for the water storage and drainage system, which can greatly reduce the dependence on the traditional power grid, reduce energy consumption and operating costs. The power generation device of this system uses Huasheng HS-B144DS heterojunction photovoltaic modules (HIT), with 7 installations installed on the roof of a factory workshop at a height angle of 20%, with an estimated annual power generation of 2900kWh.

[0062] The power-consuming equipment includes water pump 8, control valve 7, soil moisture detector 2 and water supply device. Among them, water pump 8 is DBY-25 water pump 8 of Wogong Pump Industry, and the estimated annual power consumption is 803kWh; the annual power consumption of the water supply device is 845kWh, and the data comes from Peng Wang's solar automatic tracking power generation air water device [9]. The remaining power-consuming equipment is weak current equipment and is ignored in this calculation.

[0063] After calculation, the photovoltaic power generation of 2900kWh is greater than the overall power consumption of the system of 1648kWh. The specific values ​​are shown in Table 1. Photovoltaic power generation can ensure the normal operation of the system.

[0064] Table 1

[0065]

[0066]

[0067] In order to evaluate the feasibility of water resource management for the green roof module of the processing workshop, the average water demand of the plants and the average amount of rainwater collected on the roof will be analyzed. If the collected rainwater exceeds the amount of water required for irrigation, it proves that the system can operate efficiently and sustainably.

[0068] The first step is to calculate the water requirements of the plants:

[0069] Evapotranspiration refers to the total amount of water released by evaporation from the soil or vegetation surface and by plant transpiration. There are different formulas for calculating evapotranspiration. The Penman-Monteith formula is clear and widely used to calculate evapotranspiration. It is suitable for large areas of land, vegetation coverage, and complete meteorological data. The specific formula is:

[0070]

[0071] Where: ET0 is the reference crop evapotranspiration (mm / d); Δ is the slope of the saturated water vapor pressure-temperature curve (kPa / ℃); R n is the net radiation of the crop surface (MJm-2d-1); G is the soil heat flux (MJm-2d-1); γ is the psychrometric constant (kPa / ℃); T is the daily average temperature (℃); u2 is the daily average wind speed at 2m (m / s); e s is the saturated water vapor pressure (kPa); e a is the actual water vapor pressure (kPa).

[0072] The plant planting site is selected as Xiaoshan District, Hangzhou City, Zhejiang Province. According to the open source information of China Meteorological Data Network, the summer noon temperature in Hangzhou, Zhejiang Province is higher than 31°C and the relative humidity is greater than 50%, which belongs to the hot and humid climate type. The ET0 value range is 0.20~0.30(25.4mm·d -1 ), for the convenience of calculation, the ET0 value in this paper is 0.25 (25.4 mm·d -1 ).

[0073] The calculation is carried out using the garden coefficient influencing factor, where the value of plant water requirement per unit area is affected by the garden coefficient and the reference crop evapotranspiration. The formula for plant water requirement per unit area is:

[0074] PWR=ET0·KL (2)

[0075] Where: PWR is the plant water requirement per unit area (mm); ET0 is the reference crop evapotranspiration; KL is the garden coefficient;

[0076] The calculation expression of garden coefficient is:

[0077] KL=K s ·K d ·K mc (3)

[0078] Where: KL is the garden coefficient; K s is the garden plant species factor; K d is the garden planting density factor; K mc It is the garden microclimate factor; the reference table of garden coefficient influencing factors is as follows Table 2:

[0079] Table 2

[0080]

[0081] In order to more intuitively compare the amount of irrigation water required for different plants in the roof greening module, a table is made for data comparison. The specific values ​​are shown in Table 3:

[0082] Table 3

[0083]

[0084]

[0085] According to Table 3, the water requirement per unit area of ​​different plants is 0.125~0.2 (25.4mm / d). The area of ​​the roof greening module of a factory workshop is 900㎡. After calculation, it can be known that if the irrigation water consumption of petunia, sedum, horsetail, and creeping grass is 2.86m3 / d, the irrigation water required for one week is 20.02m3; the irrigation water consumption of zoysia, concave leaf sedum, golden leaf sedum, and honeysuckle is 3.43m3 / d, and the irrigation water required for one week is 24.01m3; the irrigation water consumption of ryegrass, iris, ophiopogon, and clover is 4.572m3 / d, and the irrigation water required for one week is 32m3.

[0086] The calculation of rainwater collection capacity is as follows:

[0087] The formula for calculating the average annual amount of precipitation collected by the roof is:

[0088] V=A×P×R (4)

[0089] Where: V is the average annual rainfall collected by the roof (m 3 ); A represents the roof area (㎡); P is the average annual precipitation (m); R is the runoff coefficient.

[0090] It is known that the average annual precipitation in Xiaoshan District of Hangzhou is 1632.9 mm, the area of ​​roof greening is 900 m2, the runoff coefficient of the lawn is 0.15, and the runoff coefficient of the roof is 0.9. Then the average amount of rainwater collected by the roof of a factory workshop in a week is 29.67 m 3 .

[0091] The weekly condensation water collection calculation formula is:

[0092] V=A×P×d (5)

[0093] Where: V is the weekly water volume (m 3) ; P is the partial pressure of water vapor (kPa); A is the contact area of ​​the condensation device (㎡), and d is the number of days (7 days).

[0094] In winter, the precipitation in Xiaoshan District of Hangzhou is usually at the lowest level of the year. Taking December as an example, the average precipitation is about 21.2 mm. In addition, the average temperature is about 6.9 ° C and the relative humidity is 73% (data source 2020). In order to meet the water demand, it is necessary to introduce a supplementary device to collect water. By calculating the partial pressure of water vapor to be 5.837 kPa, and assuming that the contact area of ​​the condensation device is 10 ㎡, about 408.59 L of water can be collected per week in winter (about 0.408 m 3 ).

[0095] The feasibility of the zero-carbon drainage system is verified through two aspects. On the one hand, the power supply of the zero-carbon drainage system is ensured by photovoltaic power generation; on the other hand, the amount of rainwater collected on the roof can be calculated to meet the water needs of plants.

[0096] The calculation of photovoltaic power generation and system power consumption shows that the photovoltaic module generates 2900kWh of power, and the system consumes 1648kWh of power. The photovoltaic power generation is greater than the required power consumption. The photovoltaic module can provide sufficient power for the system to ensure the normal operation of components such as the water pump 8 and the control valve 7.

[0097] According to the calculation of roof rainwater collection and plant water demand, the amount of roof rainwater collection is 29.67m per week. 3 When the rooftop plants are Petunia, Sedum, Dianthus, Sedum, Zoysia, Sedum, Sedum, Honeysuckle, etc., the weekly water requirement of the plants is 24.01m 3 And below, the amount of rainwater collected on the roof can cover the water demand of plants; when the roof plants are ryegrass, iris, ophiopogon, clover, etc., the weekly water demand of plants is 32m 3 , the rainwater collected by the roof cannot completely cover the water demand of the plants, so supplementary irrigation of about 2.3m per week is required 3 .

[0098] Roof plants are recommended to be selected from plants with low water demand, such as petunia, sedum, calendula, sedum sedum, zoysia, sedum sedum, sedum sedum, honeysuckle, etc. Locally enriched facades can add a small number of plants with high water demand and strong ornamental value, such as irises. The amount of rainwater collected on the roof meets the water demand of most plants, and the system can supply water without manual intervention and can operate sustainably. Therefore, it can be selected according to the actual situation. The situation in each place is different, and it can be adjusted experimentally through the above method.

[0099] In summary, the conclusions are as follows:

[0100] 1) Design and verify the feasibility of this system. Simulation calculations show that the system can achieve zero-carbon operation without the need for municipal water, electricity support or artificial irrigation, thereby achieving zero-carbon emissions for roof greening.

[0101] 2) Rooftop photovoltaic power generation, automatic irrigation technology and rainwater collection irrigation technology have been widely studied. However, this system design combines these three for the first time. The system operation relies entirely on naturally collected solar radiation and rainwater collection. This experiment not only greatly saves the maintenance and operation costs of the roof greening module, but also reduces carbon emissions, which is conducive to the sustainable development of the roof greening module.

[0102] 3) In order to adapt to different climate conditions and site differences, the present invention focuses on the calculation and analysis of rainwater and plants in the storage and drainage system of zero-carbon roof greening. In the future, feasibility studies can be further expanded from large-scale practical applications and long-term performance. In addition, the intelligent monitoring and management technology for storage and drainage needs to be further optimized and popularized.

[0103] 4) As a means of green building, the roof greening module will be favored by more and more designers. The zero-carbon system reduces the operating costs of artificial irrigation, and the system energy supply saves maintenance funds for photovoltaics after construction. The combination of capital savings and simple technology of zero-carbon water storage and drainage system and roof greening module is conducive to its promotion and application.

[0104] This embodiment systematically analyzes the selection and configuration of suitable greening plants in Hangzhou, and proposes a series of suitable vegetation combination schemes. These schemes will comprehensively consider multiple ecological indicators such as vegetation carbon fixation capacity, pest and disease prevention capacity, and water storage capacity, and explore how to effectively improve the ecological environment quality of Hangzhou through scientific and reasonable greening, and better serve the sustainable development of the city. At the same time, through the verification and analysis of actual data, it provides reference and reference for other cities, thereby promoting urban greening and ecological construction across the country.

[0105] 1. Ground cover plants cover the ground to prevent soil erosion and are suitable for slope greening and flower bed ground covering. According to the climate zone where Hangzhou, China is located, common ground cover plants are ranked according to their carbon fixation capacity:

[0106] 1) Ivy (Hedera helix) Carbon fixation capacity: about 3-5tCO2 / ha / year Characteristics: evergreen plant, good ground coverage effect, strong adaptability.

[0107] 2) Ophiopogon japonicus Carbon fixation capacity: about 2.5-4tCO2 / ha / year Characteristics: well-developed root system, adaptable to various soil and light conditions.

[0108] 3) Hosta plantaginea Carbon fixation capacity: about 2-3tCO2 / ha / year Characteristics: strong shade tolerance, large leaves, and a certain effect on environmental purification.

[0109] 4) Juniperus procumbens Carbon fixation capacity: about 2-3tCO2 / ha / year Features: evergreen, drought-resistant, suitable for slope and side slope protection.

[0110] 5) Chrysogonum virginianum Carbon fixation capacity: about 1.5-2tCO2 / ha / year Features: long flowering period and good ground cover effect.

[0111] 6) Phlox subulata Carbon fixation capacity: about 1.5-2tCO2 / ha / year Features: High ornamental value, suitable for courtyards and flower bed edges.

[0112] 7) Jasminum nudiflorum Carbon fixation capacity: about 1-2tCO2 / ha / year Characteristics: early flowering, strong cold resistance, strong resistance to diseases and insect pests.

[0113] 8) Creeping thyme (Thymus serpyllum) Carbon fixation capacity: about 1-2tCO2 / ha / year Features: aromatic plant, strong adaptability, and good ground cover effect.

[0114] 9) Silvergrass (Ajuga reptans) Carbon fixation capacity: about 1-1.5tCO2 / ha / year Characteristics: purple leaves, strong cold resistance, and long flowering period.

[0115] 10) Liriope muscari Carbon fixation capacity: about 1-1.5tCO2 / ha / year Features: Large leaves, suitable for slope greening and park beautification.

[0116] 2. Ground cover plant combination:

[0117] Combination 1: Winter jasmine + big leaf vine + creeping thyme

[0118] Jasminum nudiflorum

[0119] Carbon fixation capacity: 1-2tCO2 / ha / year

[0120] Pest and disease resistance: 90% protection against pests and diseases: wilt, aphids, red spiders

[0121] Water storage capacity: 2,500-3,500m 3 / ha / year

[0122] Liriope muscari

[0123] Carbon fixation capacity: 1-1.5tCO2 / ha / year

[0124] Pest and disease resistance: 85% protection against pests and diseases: damping-off disease, scale insects, nematodes

[0125] Water storage capacity: 3,500-4,500m 3 / ha / year

[0126] Creeping Thyme (Thymus serpyllum)

[0127] Carbon fixation capacity: 1-2tCO2 / ha / year

[0128] Pest and disease resistance: 95% protection against pests and diseases: mildew, thrips, powdery mildew

[0129] Water storage capacity: 1,000-1,500m 3 / ha / year

[0130] Combination 2: Dwarf Ophiopogon japonicus + Clover + Hosta

[0131] Ophiopogon japonicus

[0132] Carbon fixation capacity: 2.5-4tCO2 / ha / year

[0133] Pest and disease resistance: 95% protection against pests and diseases: root rot, mealybugs, leafminers

[0134] Water storage capacity: 3,500-4,500m 3 / ha / year

[0135] Clover (Trifolium repens)

[0136] Carbon fixation capacity: 0.8-1tCO2 / ha / year

[0137] Pest and disease resistance: 80% protection against pests and diseases: rust, scale insects, aphids

[0138] Water storage capacity: 2,000-2,500m 3 / ha / year

[0139] Hosta plantaginea

[0140] Carbon fixation capacity: 2-3tCO2 / ha / year

[0141] Pest and disease resistance: 70% protection against pests and diseases: gray mold, leaf spot, snails

[0142] Water storage capacity: 3,000-4,000m 3 / ha / year

[0143] When designing the combination, the carbon fixation capacity, pest and disease prevention capacity, water storage capacity and visual effect of the plants are comprehensively considered. Among them, combination one is a plant combination that is both practical and ornamental, and is particularly suitable for improving the quality of the ecological environment and beautifying the landscape. It has low maintenance costs, high resistance to pests and diseases, and good ecological contributions. Combination two is a plant combination that is both practical and ornamental. It not only has efficient ecological functions, but also provides beautiful landscape effects. At the same time, it has low maintenance costs and a wide range of adaptability, making it suitable for green ecological projects in the Hangzhou area.

[0144] In summary, the above-mentioned combinations can not only maximize the advantages of each plant, but also maintain good growth conditions under the climatic conditions in the Hangzhou area.

Claims

1. A water storage and drainage system for a zero-carbon roof greening module, characterized in that: include: Green roof modules, installed on the roof of a building, can be used to store water and grow plants; Roof gutters are installed on the roof of a building; A water storage tank, which is installed at a position lower than the roof greening module and the roof drainage trough. The water storage tank is connected to the roof greening module via a water delivery pipe I equipped with a control valve, connected to the roof greening module via a water delivery pipe II equipped with a water pump, and connected to the roof drainage trough via a water delivery pipe III equipped with a filter assembly; A soil moisture detector is provided in the roof greening module and is used to collect moisture data in the roof greening module; The control unit is connected to the soil moisture detector, the control valve and the water pump circuit, and can be used to control the operation of the control valve and the water pump based on the humidity data collected by the soil moisture detector.

2. The water storage and drainage system of the zero-carbon roof greening module according to claim 1 is characterized by: The roof greening module includes at least one water storage planting trough module; The water storage planting trough module comprises a module container, at least one water inlet and outlet is provided on the side wall of the module container, a water storage tank is provided at the bottom of the module container, a filter layer is provided above the water storage tank, and a lightweight planting base for planting plants is provided above the filter layer.

3. The water storage and drainage system of the zero-carbon roof greening module according to claim 2 is characterized by: A water-absorbing cotton felt is also provided between the filter layer and the water storage tank.

4. The water storage and drainage system of the zero-carbon roof greening module according to claim 2 is characterized by: A soil fixing grid is arranged above the lightweight planting base.

5. The water storage and drainage system of the zero-carbon roof greening module according to claim 2 is characterized by: One or more of petunia, sedum, calendula, creeping cycad, zoysia grass, concave leaf sedum, golden leaf sedum and honeysuckle are planted on the light planting base.

6. The water storage and drainage system of the zero-carbon roof greening module according to claim 1 is characterized by: The water storage tank is provided with an overflow port and a drain pipe, and both the overflow port and the drain pipe are connected to the municipal drainage network.

7. The water storage and drainage system of the zero-carbon roof greening module according to claim 1 is characterized by: The water storage tank is connected to the household water pipeline.

8. The water storage and drainage system of the zero-carbon roof greening module according to claim 1 is characterized by: A stainless steel filter screen and activated carbon filter cotton are arranged in the water storage tank.

9. The water storage and drainage system of the zero-carbon roof greening module according to claim 1, characterized in that: Also includes: The atmospheric condensation water collection device has a water outlet connected to the roof greening module via a water delivery pipe IV equipped with a control valve.

10. The water storage and drainage system of the zero-carbon roof greening module according to claim 1, characterized in that: Also includes: Photovoltaic power generation module is used to provide power for the water storage and drainage system.

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