A multi-purpose rainwater energy pool

Abstract

This invention provides a multi-purpose rainwater and sewage energy pool, comprising: a water storage tank for collecting and storing rainwater and sewage, a sand-based breathable waterproof membrane, and gravel; the water storage tank is placed underground, and its inlet is connected to a rainwater inlet; the water storage tank is surrounded by the sand-based breathable waterproof membrane, and gravel is filled outside the membrane, creating a lateral airflow and energy channel between the water in the water storage tank and the surrounding soil. This invention addresses the limitations of utilizing natural energy for building heating in cold, water-scarce regions such as northern China, proposing a multi-purpose rainwater energy pool. This energy pool combines sponge city construction with natural energy development, collecting, purifying, and storing rainwater and sewage, allowing the stored water to exchange energy with the soil, indirectly utilizing soil thermal energy, and storing the thermal energy within the pool.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy-saving technology, more particularly to a multipurpose rainwater energy pool. BACKGROUND

[0002] Since the 21st century, there have been many researches on natural energy development and utilization at home and abroad, and many application achievements have been made, such as water source heat pump, ground source heat pump, air source heat pump technology and equipment, which can be used for building heating, air conditioning and hot water supply. Water source heat pump mainly uses the heat of underground water, surface water and sewage as energy supply. The heat capacity of water is large, and the heat exchange efficiency of water source heat pump system is high. However, the surface water and sewage heat source heat pump system is only suitable for areas with abundant surface water such as river basins. The water temperature and flow are greatly affected by climate change, and it is difficult to ensure the stable use of the system throughout the year. Although the underground water source heat pump system is less affected by climate change, problems such as groundwater pollution, land subsidence and abnormal ground temperature occur in the process of development and utilization. In areas such as Beijing in northern China, the development and utilization of groundwater resources are strictly prohibited, and water source heat pump technology cannot be used, which restricts the application of water source heat pump technology in northern China.

[0003] At the same time, sponge city construction is being carried out at home and abroad, and more and more urban rainwater collection, storage and application systems are being developed. The present application combines sponge city construction with natural energy development and proposes a multipurpose rainwater energy pool for integrated storage and utilization of rainwater resources and natural energy, providing an innovative model for water source heat supply and refrigeration in water-deficient areas such as Beijing. SUMMARY

[0004] The present application aims to provide a multipurpose rainwater and sewage energy pool with the functions of water purification, storage, energy storage and heat exchange. Combined with the construction of rainwater storage and regulation pools in towns, rainwater and sewage and other water resources can be collected, stored, purified and utilized on site, solving the problems of urban waterlogging and water environmental pollution. At the same time, the stored water can be used as a heat source to realize the integrated storage and utilization of rainwater and sewage resources and natural energy.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A multipurpose rainwater and sewage energy pool comprises a water storage pool for collecting and storing rainwater and sewage, a sand-based air-permeable waterproof membrane and gravel. The water storage pool is placed underground, and the water inlet of the water storage pool is connected with the rainwater collection outlet. The water storage pool is wrapped with a sand-based air-permeable waterproof membrane, and the gravel is filled outside the sand-based air-permeable waterproof membrane, forming a horizontal airflow and energy channel between the water in the water storage pool and the surrounding soil.

[0007] The bottom of the water storage pool is provided with an air-permeable and impermeable buried hole, and the air-permeable and impermeable buried hole is paved with air-permeable and impermeable sand. The gas in the pores of the air-permeable and impermeable sand increases the heat exchange between the soil and the water body through thermal convection.

[0008] The water storage pool bottom is uniformly and spacedly provided with the air-permeable and anti-seepage buried holes.

[0009] The height of the air-permeable and anti-seepage buried hole is consistent with the thickness of the water storage pool bottom or penetrates into the soil layer of the water storage pool bottom.

[0010] The water storage pool is internally provided with the honeycomb filter wall structure.

[0011] The honeycomb filter wall structure is composed of a plurality of honeycomb filter wall units spliced together, the honeycomb filter wall unit comprises a hexagonal outer wall, an inner wall and a partition plate, the partition plate is arranged between the hexagonal outer wall and the inner wall to connect the hexagonal outer wall and the inner wall, and the space between the hexagonal outer wall and the inner wall is divided into a plurality of cavities.

[0012] The water body forms microcirculation in the cavities surrounded by the inner wall and the cavities formed by the hexagonal outer wall, the inner wall and the partition plate.

[0013] The hexagonal outer wall, the inner wall and the partition plate are made of sand-based permeable sand.

[0014] The inner wall is a cylindrical body.

[0015] The partition plates are uniformly and spacedly arranged.

[0016] The honeycomb filter wall structure can be arranged in a full-paving or partial-paving mode according to the water quality of the water storage pool inlet and the water quality requirement.

[0017] The sand-based air-permeable and anti-seepage bricks are paved on the top of the water storage pool, the sand-based air-permeable and waterproof membrane is covered above the air-permeable and anti-seepage bricks, the soil is covered above the sand-based air-permeable and waterproof membrane, and the vertical air flow and heat channel of the water body in the water storage pool and the soil is constructed.

[0018] The sand-based air-permeable and anti-seepage well covers are arranged above the water inlet and the water outlet of the water storage pool, so as to facilitate the inspection of the operation state of the water storage pool.

[0019] In summer, the temperature of the rainwater or sewage collected by the water storage pool is higher than the temperature of the soil, the water body transmits heat to the soil, and the cold energy of the soil is stored in the pool; in winter, the temperature of the rainwater or sewage collected by the water storage pool is lower than the temperature of the soil, the soil transmits heat to the water body, and the heat energy of the soil is stored in the pool, so that the underground water storage pool is used as an energy pool.

[0020] Compared with the prior art, the technical features and beneficial effects of the present application are:

[0021] Technical features (principle):

[0022] The application discloses a rainwater resource and natural energy integrated storage and utilization technology. The soil below the frozen soil layer is in a thermal stable state all the year round, and can be used as a cooling source for summer refrigeration and a low-temperature heat source for winter heating. Based on the fact, the rainwater collecting system based on the sponge city construction is combined with the natural energy utilization, the water storage pool for collecting and storing rainwater is arranged below the frozen soil layer, heat exchange is conducted between the water storage pool and the soil, the underground water storage pool is changed into a heat exchange and energy storage pool, and the heat is stored in the water body in the water storage pool. In summer, the temperature of the water collected in the water storage pool is higher than the temperature of the soil, heat is transferred from the water body to the soil, the temperature of the water body is reduced, and the cold energy of the soil is stored in the water storage pool; in winter, the temperature of the rainwater or sewage collected in the water storage pool is lower than the temperature of the soil, heat is transferred from the soil to the water body, the temperature of the water body is increased, and the heat source of the soil is stored in the water storage pool.

[0023] Beneficial effects:

[0024] The application discloses a multipurpose rainwater energy pool, which combines the sponge city construction and the natural energy development, collects, purifies and stores rainwater and sewage, exchanges energy between the stored water body and the stratum soil, indirectly utilizes the soil heat energy, and stores the heat energy in the pool.

[0025] With the promotion of the sponge city construction, a large number of underground water storage pools are constructed in communities in Beijing, but the rainwater collected in the pools is only used for greening irrigation. The multipurpose rainwater energy pool of the application uses the rainwater and sewage collected, purified and stored in the underground water storage pool as the heat source of a water source heat pump, effectively stores the soil heat source in the pool under the restriction of prohibiting the development of underground water sources, and obtains a more stable heat source than surface water; compared with the soil source heat pump in the prior art which is constructed by embedding a pipe in a shallow layer of soil, the system is simpler in the early construction and the later maintenance, and can be applied to not only new buildings but also old buildings.

[0026] In addition, the multipurpose rainwater energy pool can also be used for fresh air heat exchange, air is directly introduced into the water body and directly exchanges heat with the water body. Pollutants in the air are dissolved or left in the water through the water adhesion force, and the purification purpose is also achieved. Alternatively, a fresh air pipeline is arranged in the rainwater energy pool, air in the pipeline indirectly exchanges heat with the water body, the fresh air is heated or refrigerated to 10-15 DEG C, the energy required for subsequent heat exchange is reduced, frosting of the heat exchanger is prevented, and the heat exchange efficiency of the heat exchanger is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic view of the multipurpose rainwater energy pool of the embodiment 1 of the application.

[0028] Figure 2 This is a schematic diagram of the multi-purpose rainwater energy pool in Embodiment 2 of the present invention;

[0029] Figure 3 This is a schematic diagram of the multi-purpose rainwater energy pool in Embodiment 2 of the present invention;

[0030] Figure 4 A schematic diagram of the honeycomb filter wall unit within the energy pool;

[0031] Figure 5 A schematic diagram of the honeycomb filter wall structure inside the energy pool;

[0032] Figure 6 The diagram shows a full-coverage honeycomb filter wall structure within the energy pool. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, a multi-purpose rainwater and sewage energy pool includes: a water storage tank 1 for collecting and storing rainwater and sewage, a sand-based breathable and waterproof membrane 2, and gravel 3; the water storage tank 1 is placed underground, and its inlet is connected to a rainwater inlet; the water storage tank 1 is wrapped with the sand-based breathable and waterproof membrane 2, and the membrane 2 is filled with gravel to create a lateral airflow and energy channel between the water body 4 inside the water storage tank 1 and the surrounding soil 5. The water storage tank 1 is surrounded by concrete or breathable and impermeable sand. The bottom of the water storage tank 1 is paved with concrete.

[0036] The construction method of the multipurpose rainwater and sewage energy pool is as follows: dig a deep pit underground, lay a water storage tank 1, wrap the water storage tank 1 with a sand-based breathable waterproof membrane 2, and fill the space between the sand-based breathable waterproof membrane 2 and the pit wall with gravel 3.

[0037] Example 2

[0038] like Figure 2 As shown, a multi-purpose rainwater and sewage energy pool includes: a water storage tank 1 for collecting and storing rainwater and sewage, a sand-based breathable and waterproof membrane 2, and gravel 3; the water storage tank 1 is placed underground, and its inlet is connected to a rainwater inlet; the water storage tank 1 is wrapped with the sand-based breathable and waterproof membrane 2, and the membrane 2 is filled with gravel to create a lateral airflow and energy channel between the water body 4 inside the water storage tank 1 and the surrounding soil 5. The water storage tank 1 is surrounded by concrete or breathable and impermeable sand. The bottom of the water storage tank 1 is paved with concrete.

[0039] The bottom of the water storage pool 1 is provided with a breathable anti-seepage buried hole, and breathable anti-seepage sand 6 is laid in the breathable anti-seepage buried hole. The gas in the pores of the breathable anti-seepage sand 6 increases the heat exchange between the soil and the water body through the effect of thermal convection. The height of the breathable anti-seepage buried hole is consistent with the thickness of the bottom of the water storage pool 1. The upper surface of the breathable anti-seepage sand 6 in the breathable anti-seepage buried hole is in contact with the water body 4 in the water storage pool 1, and the lower surface is in contact with the soil 5 at the bottom of the water storage pool 1.

[0040] The construction method of the multipurpose rainwater and sewage energy pool is as follows: a pit is dug underground, a water storage pool 1 is laid, then a sand-based breathable waterproof membrane 2 is wrapped around the water storage pool 1, and then gravel 3 is filled between the sand-based breathable waterproof membrane 2 and the pit wall. The breathable anti-seepage buried hole is reserved when laying the bottom of the water storage pool 1.

[0041] After the water storage pool 1 is laid, the breathable anti-seepage sand is filled in the breathable anti-seepage buried hole.

[0042] Example 3

[0043] As shown in Figure 3 , a multipurpose rainwater and sewage energy pool comprises: a water storage pool 1 for collecting and storing water bodies such as rainwater and sewage, a sand-based breathable waterproof membrane 2, and gravel 3. The water storage pool 1 is placed underground, and the water inlet of the water storage pool 1 is connected with the rainwater collection outlet. The water storage pool 1 is wrapped with a sand-based breathable waterproof membrane 2, and the outside of the sand-based breathable waterproof membrane 2 is filled with gravel, thereby constructing a horizontal airflow and energy channel between the water body 4 in the water storage pool 1 and the surrounding soil 5. The water storage pool 1 is laid with concrete or breathable anti-seepage sand around. The bottom of the water storage pool 1 is laid with concrete. The water storage pool is provided with a honeycomb filter wall structure 7. The top of the water storage pool 1 is laid with sand-based breathable anti-seepage bricks 8, the top of the sand-based breathable anti-seepage bricks 8 is covered with a sand-based breathable waterproof membrane 2, the sand-based breathable waterproof membrane 2 is covered with soil 9, and a vertical airflow and heat channel between the water body and the soil in the water storage pool is constructed.

[0044] A sand-based breathable anti-seepage well cover 10 is arranged above the water inlet and outlet of the water storage pool 1, which is convenient for checking the operation state of the water storage pool.

[0045] The bottom of the water storage pool 1 is provided with a breathable anti-seepage buried hole, and breathable anti-seepage sand 6 is laid in the breathable anti-seepage buried hole. The gas in the pores of the breathable anti-seepage sand 6 increases the heat exchange between the soil and the water body through the effect of thermal convection. The breathable anti-seepage buried hole penetrates into the soil 5 at the bottom of the water storage pool 1, the upper surface of the breathable anti-seepage sand 6 in the breathable anti-seepage buried hole is in contact with the water body 4 in the water storage pool 1, and the lower surface is in contact with the soil 5 at the bottom of the water storage pool 1. The height of the breathable anti-seepage buried hole can be determined according to the actual situation.

[0046] As shown in Figures 4-6As shown, the honeycomb filter wall structure 7 is composed of a plurality of honeycomb filter wall units, each of which comprises a hexagonal outer wall 71, an inner wall 72 and a partition plate 73 arranged between the hexagonal outer wall 71 and the inner wall 72 to connect the hexagonal outer wall 71 and the inner wall 72 and divide the space between the hexagonal outer wall 71 and the inner wall 72 into a plurality of cavities.

[0047] The water body 4 forms a microcirculation in the cavities surrounded by the inner wall 72 and the cavities formed by the hexagonal outer wall, the inner wall and the partition plate. The hexagonal outer wall, the inner wall and the partition plate are made of reinforced concrete or sand-based permeable sand. The inner wall 72 is a cylinder. The partition plates 73 are uniformly and regularly arranged.

[0048] As shown, Figure 6 The honeycomb filter wall structure 7 can be fully paved or partially paved according to the water quality of the water inlet of the water storage tank 1 and the water quality requirement.

[0049] If the water quality of the water inlet of the water storage tank 1 is good, a partial paving arrangement (not shown in the figure) can also be selected.

[0050] The construction method of the multipurpose rainwater and sewage energy pool is as follows: a pit is dug underground, the water storage tank 1 is paved, then the sand-based air-permeable waterproof membrane 2 is wrapped around the water storage tank 1, and then the gravel 3 is filled between the sand-based air-permeable waterproof membrane 2 and the pit wall. The air-permeable anti-seepage buried hole is reserved when paving the bottom of the water storage tank 1, and the air-permeable anti-seepage buried hole is arranged to penetrate into the soil 5 at the bottom of the water storage tank 1, as shown in Figure 3 .

[0051] After the water storage tank 1 is paved, the air-permeable anti-seepage sand is filled in the air-permeable anti-seepage buried hole.

[0052] Then the sand-based air-permeable anti-seepage brick 8 is paved on the top of the water storage tank 1, the sand-based air-permeable waterproof membrane 2 is covered on the top of the air-permeable anti-seepage brick 8, the soil 9 is covered on the top of the sand-based air-permeable waterproof membrane 2, and plants can be planted on the soil 9.

[0053] The energy pool of the present application can store water, purify water and provide heat or cooling for buildings as an energy pool.

[0054] For example, an office building with an area of 12000m 2 , the effective volume of the water body of the energy pool is 3000m 3 , the land area of the energy pool is 1500m 2 , and the surface area (excluding the top of the pool) is 4700m 2 , the absorption and release of heat by the water body can be calculated according to the following formula:

[0055] Q = cmΔT

[0056] In the formula, Q represents the absorption or release of heat by the water body, in kJ;

[0057] c - specific heat capacity of water, 4.2 kJ / (kg·℃);

[0058] m - water mass, unit kg;

[0059] ΔT - temperature difference before and after heat exchange of water, unit ℃.

[0060] Extract 10℃ energy from the water body of the energy pool

[0061] Q w = cmΔT = 4.2 × 3 × 10 6 × 10 = 1.26 × 10 8 (kJ) ≈ 35000 (kW·h).

[0062] According to the Beijing super low energy consumption building standard, its energy consumption index is 20-30 W / m 2 , and the total load is 360 kW according to 30 W / m 2 , and the total load is 360 kW according to 10h per day.

[0063] (1) In winter, the water storage tank heating time is:

[0064] T = 35000 ÷ 360 = 97.2 (h) ≈ 10 (days)

[0065] The heat conduction between the energy pool and the soil per unit time can be calculated according to the formula for calculating the heat conduction of the plate:

[0066]

[0067] In the formula, Q - heat flow from high temperature side to low temperature side, W;

[0068] λ - thermal conductivity of the plate, W / (m·K), thermal conductivity of concrete is 1.28 W / (m·K), and thermal conductivity of soil is 1.74 W / (m·K);

[0069] F - area of the plate, m 2 ;

[0070] δ - plate thickness, m.

[0071] According to the total area of the pool wall 3200 m 2 , the pool bottom is 1500 m 2Assuming a wall thickness of 0.2m, in winter, the soil conducts heat to the pool wall, which in turn transfers it to the water inside, reheating the cooled water from 5℃ to 15℃. The heat flow rate of the soil to the pool wall per unit time is Q1 = 204.8kW. Since the thermal conductivity of the permeable and seepage-proof buried boreholes is higher than that of concrete (including the permeable and seepage-proof sand and the contact area between the permeable and seepage-proof buried boreholes and the soil), the heat conduction to the pool bottom is approximately 1.3 times that of a normal pool bottom. The heat flow rate of the soil to the pool bottom per unit time is Q2 = 124.8kW. The total heat flow rate of the soil to the pool per unit time is Q... 总 =329.6kW.

[0072] The water in the energy pool is in a flowing state, and the calculation is performed according to the convective heat transfer formula:

[0073] Q 对流 =αF(T1-T2)

[0074] In the formula, α is the heat transfer coefficient between the wall and the fluid, in W / (m²). 2 (·K). The convective heat transfer coefficient for laminar water flow is 500–2500 W / (m²). 2 ·K), the convective heat transfer coefficient in turbulent water flow can reach 3500~10000W / (m²). 2 ·K), the water in the reservoir contains laminar and turbulent flow. The heat exchange of the water flow per unit time is much greater than the heat absorbed by the reservoir wall from the soil. Therefore, the heat from the soil can be transferred and stored in the water body in a timely manner.

[0075] When the water temperature rises from 5°C to 15°C, the water body needs to absorb heat Q from the soil. 吸 = 35000 kW·h, since heat transfer occurs in the energy pool 24 hours a day, the required time is:

[0076] T 吸 =35000 ÷ 329.6 = 106.2 (h) ≈ 4.42 (days) < 10 (days)

[0077] Understandably, the energy pool in this application can provide a stable heat source for office building heating.

[0078] (2) In summer, based on the heat absorbed by the soil within 1m around the energy pool, the heat absorbed by the soil from the pool wall per unit time is Q1′=83.5kW; assuming the heat conduction to the pool bottom by the heat-permeable anti-seepage column is 1.3 times that of the ordinary pool bottom, the heat absorbed by the soil from the pool bottom per unit time is Q2′=50.9kW. The total heat absorbed by the soil from the energy pool per unit time is Q. 总 =134.4kW.

[0079] The water in the energy pool cools from 30°C to 15°C, releasing heat Q. 放 =52500kW·h, the required time is:

[0080] T 放 = 52500 ÷ 134.4 = 390 (h) ≈ 16 (days) > 15 (days)

[0081] The energy pool of the present application can absorb most of the cooling energy from the soil to provide building refrigeration, in addition, auxiliary heating or refrigeration can be provided by air source heat pump, fresh air purification heat exchanger, etc. to ensure the stability and reliability of the system operation, and the air source heat pump can be used to store air energy in the energy pool.

[0082] It should be noted that various modifications can be made to the embodiments disclosed herein, and therefore, the embodiments disclosed in the specification should not be regarded as limiting the present application, but only as examples, and the purpose is to make the features of the present application obvious.

[0083] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A multipurpose stormwater and sewage energy pool characterized in that, The application relates to a water storage pool for collecting and storing rainwater and sewage water bodies, a sand-based air-permeable waterproof membrane and gravel; the water storage pool is arranged underground, a water inlet of the water storage pool is connected with a rainwater collection outlet, the sand-based air-permeable waterproof membrane is wrapped around the water storage pool, and the gravel is filled outside the sand-based air-permeable waterproof membrane, so as to construct a horizontal airflow and energy channel between the water body in the water storage pool and the surrounding soil; a honeycomb filter wall structure is arranged in the water storage pool, the honeycomb filter wall structure is composed of a plurality of honeycomb filter wall units, the honeycomb filter wall unit comprises a hexagonal outer wall, an inner wall and a partition plate, the partition plate is arranged between the hexagonal outer wall and the inner wall to connect the hexagonal outer wall and the inner wall, and the space between the hexagonal outer wall and the inner wall is divided into a plurality of cavities; the water body forms microcirculation in the cavities surrounded by the inner wall and the cavities formed by the hexagonal outer wall, the inner wall and the partition plate; The bottom of the water storage pool is provided with air-permeable and impermeable buried holes, and air-permeable and impermeable sand is arranged in the air-permeable and impermeable buried holes; the air in the pores of the air-permeable and impermeable sand increases the heat exchange between the soil and the water body through the action of thermal convection; In summer, the temperature of the rainwater or sewage water collected by the water storage pool is higher than the temperature of the soil, the water body transmits heat to the soil, and the cold energy of the soil is stored in the pool; in winter, the temperature of the rainwater or sewage water collected by the water storage pool is lower than the temperature of the soil, the soil transmits heat to the water body, and the heat of the soil is stored in the pool. The air-permeable and impermeable buried holes are uniformly and interval arranged at the bottom of the water storage pool.

2. The multipurpose stormwater and wastewater energy cell of claim 1, wherein, The height of the air-permeable and impermeable buried holes is consistent with the thickness of the bottom of the water storage pool or the air-permeable and impermeable buried holes penetrate into the soil layer at the bottom of the water storage pool.

3. The multipurpose stormwater and wastewater energy cell of claim 1, wherein, The honeycomb filter wall structure is arranged in a full-paving or partial-paving mode according to the water quality of the water inlet of the water storage pool and the water quality requirement of the water.

4. The multipurpose stormwater and wastewater energy cell of claim 1, wherein, The sand-based air-permeable waterproof bricks are arranged at the top of the water storage pool, the sand-based air-permeable waterproof membrane is arranged above the air-permeable waterproof bricks, and the soil is arranged above the sand-based air-permeable waterproof membrane, so as to construct a vertical airflow and heat channel between the water body in the water storage pool and the soil.

5. The multipurpose stormwater and wastewater energy cell of claim 1, wherein, Air-permeable and impermeable well covers are arranged above the water inlets and outlets of the water storage pool.

6. The multipurpose stormwater and wastewater energy cell of claim 1, wherein, ​

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