JP7002083B2 - Rainwater circulation utilization system - Google Patents

Description

The present invention relates to a rainwater circulation utilization system that effectively utilizes rainwater for melting snow and the like.

Conventionally, as disclosed in Patent Document 1, a water tank capable of storing rainwater and a watering device provided around a roof or a house are connected by a pipe and a pump, and a heating device is installed in the middle of the pipe. The provided snow melting device has been proposed. Further, Patent Document 2 proposes a rainwater circulation roof cooling system that sprinkles rainwater or the remaining hot water of a bath on the roof as a cooling means in the summer.

Further, when water is sprinkled for snowmelt, it may freeze due to the temperature below the freezing point. Therefore, as disclosed in Patent Documents 3 and 4, antifreeze and an antifreeze agent are mixed with the snowmelt water to circulate the snowmelt water. A snowmelt system has also been proposed.

Japanese Unexamined Patent Publication No. 61-207754 Japanese Unexamined Patent Publication No. 2004-76541 Japanese Unexamined Patent Publication No. 2007-278504 Japanese Unexamined Patent Publication No. 2018-188915

However, in order to use water such as rainwater for snowmelt, the snowmelt water is exposed to the outside air and circulates, so it freezes easily when the temperature is below freezing, making it difficult to collect the snowmelt water. There is also a risk of explosion. Patent Document 1 provides a heating device for raising the temperature of the circulating snowmelt water, but there is a problem that energy cost for heating is high. Further, in the case of cooling the roof of Patent Document 2, there is a problem that the roof can be used only in the summer, the frequency of use is low, and the effect on the cost is low.

Further, as disclosed in Patent Documents 3 and 4, when antifreeze or an antifreeze agent is mixed with snowmelt water, if the snowmelt water is directly flowed to the surrounding land or drainage channel, the area around the road or the premises of the house Since environmental pollution occurs in the soil, the treatment of snowmelt water mixed with antifreeze becomes a problem. Common antifreeze agents include chlorides such as calcium chloride, sodium chloride and magnesium chloride, urea and the like. Of these, chlorides such as calcium chloride, sodium chloride and magnesium chloride are the most widely used. These chlorides are widely used as antifreeze agents because of their low freezing temperature, excellent solubility and immediate effect, low price, abundant supply, and easy storage, transportation and spraying. There is. However, chloride causes salt damage, and has problems such as metal corrosion, deterioration of concrete, and contamination of surrounding soil. Specifically, there are damages such as corrosion of the car body, deterioration and damage of structures around the road such as bridges, road signs, and tunnels, and withering of roadside trees.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide an economical rainwater circulation utilization system that effectively utilizes rainwater, is environmentally friendly, and is frequently used. do.

The present invention comprises a rainwater tank for storing recovered rainwater and an antifreeze agent containing at least salts of organic acids such as salts of sodium, potassium, magnesium, ammonium such as formic acid, acetic acid, propionic acid, succinic acid and the like. An antifreeze aqueous solution tank that stores the mixed rainwater aqueous solution, a switching valve that selectively sends out the rainwater in the rainwater tank and the aqueous solution in the antifreeze aqueous solution tank, and the rainwater or the rainwater selected by the switching valve. A pump that sends out an aqueous solution, a pipe that delivers and sprinkles the rainwater or the aqueous solution sent out by the pump to a predetermined location, a recovery means that collects the rainwater or the aqueous solution sprinkled from the pipe, and an outside temperature. The outside temperature sensor for detecting and a control device for controlling the switching valve and the pump by inputting the output of the outside temperature sensor are provided, and the control device has an outside temperature of 3 ° C. by a signal from the outside temperature sensor. When the temperature is higher than the predetermined temperature within ~ -3 ° C, the switching valve is switched so that the rainwater can be sent from the rainwater tank to the pump, and when the temperature is lower than the predetermined temperature, the switching valve is switched. This is a rainwater circulation utilization system in which the switching valve is switched so that the aqueous solution can be sent from the antifreeze aqueous solution tank to the pump, and the rainwater or the aqueous solution can be sprinkled through the piping.

The organic acid is preferably acetic acid, succinic acid, or propionic acid. The salt of the organic acid is preferably potassium acetate, disodium succinate, disodium succinate / hexahydrate, or sodium propionate.

Further, the antifreeze agent is a freezing point depression agent composed of at least one chloride selected from sodium chloride, calcium chloride and magnesium chloride and succinate or propionate with respect to 100 parts by mass of the chloride. It is preferable that the freezing point depressant is mixed in an amount of 5 to 20 parts by mass.

The control device makes it possible to deliver the aqueous solution of the antifreezing agent aqueous solution tank to the piping when the outside air temperature becomes lower than a predetermined temperature within 0 ° C. to -3 ° C., and the switching valve. To control. The pipe is connected to a roof sprinkler pipe provided on the roof of a house, a photovoltaic power generation panel is installed on the roof, and the roof sprinkler pipe is provided on the surface of the solar power generation panel so as to be able to sprinkle water. It is a thing.

A concentration sensor for detecting the concentration of the aqueous solution is provided in the antifreeze aqueous solution tank or the suction pipe which is a pipe connected to the antifreeze aqueous solution tank, and the antifreeze is adjacent to the antifreeze aqueous solution tank. An antifreeze replenishing device for charging the antifreeze agent into the antifreeze aqueous solution tank when a container containing the antifreeze is provided and the concentration of the aqueous solution in the antifreeze aqueous solution tank becomes a certain value or less. It is equipped with.

The rainwater tank and the antifreeze aqueous solution tank do not have an open opening, and store the rainwater or the aqueous solution in a light-shielded space, and recycle the rainwater and the aqueous solution.

The rainwater circulation utilization system of the present invention uses rainwater including melted snow for cooling snowmelt water and photovoltaic power generation panels, and is used for melting snow in roofs, premises, and other necessary areas, and improving power generation efficiency. In addition, the snowmelt water used for snowmelt is switched depending on the outside temperature to prevent freezing and effectively melt the snow. Further, the snowmelt water is a mixture of an antifreezing agent having a small environmental load, and has little effect even if it flows out to the external environment. Further, by using it for melting snow and cooling a solar panel, it is possible to improve the power generation efficiency by sunlight.

Furthermore, organic acid salts such as potassium acetate, disodium succinate and sodium propionate become weakly alkaline aqueous solutions, and the pH of the antifreeze aqueous solution to which this is added is easy to control, and it is possible to control the pH of pumps, valves, pipes, etc. It suppresses oxidation of equipment, enhances durability, and can be easily adjusted to within the pH range that meets water quality regulations when draining.

It is a schematic diagram of one Embodiment of the rainwater circulation utilization system of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which a rainwater circulation utilization system 10 is installed in a photovoltaic power generation panel 16 installed on the roof 14 of a house 12, snowmelt and cooling of the roof 14, and parking around the house 12. It is used for melting snow and sprinkling water on the site 20 such as the parking lot and the entrance leading to the entrance 18.

As shown in FIG. 1, the photovoltaic power generation panel 16 installed on the roof 14 of the house 12 is a rectangular plate-shaped body having a predetermined size, and is internally provided with a solar cell module including a solar cell, a circuit board, and the like. Has been done. A protective glass that protects the surface of the solar cell module is provided on the surface side of the solar cell module. The photovoltaic power generation panel 16 is installed on the south slope of the roof 14 of the house 12, and the units of the individual power generation panels are mounted side by side.

The site 20 of the house 12 is a mixture of a rainwater tank 22 for storing rainwater containing thawed water collected by a recovery means described later and an antifreeze agent containing at least an organic acid salt as described later. An antifreeze aqueous solution tank 24 for collecting and storing the aqueous solution is installed. Adjacent to the antifreezing agent aqueous solution tank 24, there is also provided an antifreezing agent tank 26 for a container containing a liquid which is a stock solution in which an antifreezing agent containing an organic acid salt or the like is dissolved. The rainwater tank 22, the antifreeze agent aqueous solution tank 24, and the antifreeze agent tank 26 are integrally provided with each other, or are independently provided in the vicinity thereof, and are installed on the ground or in the ground in the site 20. The rainwater tank 22, the antifreezing agent aqueous solution tank 24, and the antifreezing agent tank 26 are set in a shielded space without having an opening open to the outside air, and store rainwater or an aqueous solution of the antifreezing agent, which will be described later. Rainwater and aqueous solution are installed so that they can be circulated and used by each pipe.

Suction pipes 27 and 28 are inserted into the rainwater tank 22 and the antifreezing agent aqueous solution tank 24, respectively, and the suction pipes 27 and 28 are connected to the pumps 31 and 32, respectively. The pumps 31 and 32 are connected to the supply pipe 34 via switching valves 29 and 30 that selectively send out rainwater and an aqueous solution of an antifreeze agent by a control device 60 described later. The supply pipe 34 supplies rainwater and an aqueous solution to the inside and outside of the house 12, and is connected to the snowmelt pipe 33, the roof sprinkler pipe 36, and the like. The snowmelt pipe 33 sprinkles water on the entrance or parking lot in the site 20 to melt snow, and the roof sprinkler pipe 36 cools and extinguishes snow on the roof 14 and the photovoltaic power generation panel 16. Further, the pump 31 connected to the rainwater tank 22 is also connected to the indoor pipe 35 connected indoors and the standing faucet 37 of the site 20, and is used for flushing the flush toilet 38 and sprinkling rainwater in the site 20. ..

In addition, in order to collect the sprinkled rainwater and the like, the rain gutter 40 of the house 12 and the vertical gutter 41 to which the rain gutter 40 is connected are connected to the catchment basin 42 in the site 20, and the catchment basin 42 is connected to the catchment basin 42. It is connected to a recovery pipe 43 which is a means for recovering rainwater or an aqueous solution. The recovery pipe 43 is connected to another water collecting basin 45 in the site 20, and the water collecting basin 45 is also connected to a gutter 44 such as a U-shaped groove. The gutter 44 collects the rainwater that has fallen in the site 20 and the rainwater sprinkled from the snowmelt pipe 33 in the catchment basin 45. The water collecting basin 45 is connected to a recovery pipe 46 for selectively returning rainwater or the like that has flowed in and collected back to the rainwater tank 22 and the antifreezing agent aqueous solution tank 24. The rainwater used in the flush toilet 38 is connected to the sewer pipe and drained.

The recovery pipe 46 is connected to the switching valves 47 and 48 interlocking with the switching valves 29 and 30, and the switching valves 47 and 48 are connected to the return pipes 49 and 50 connected to the rainwater tank 22 and the antifreezing agent aqueous solution tank 24, respectively. Each is connected. As a result, the rainwater collected from the water collecting basin 45 by the recovery pipe 46 is selectively connected to the rainwater tank 22 and the antifreezing agent aqueous solution tank 24 by the switching valves 47 and 48 and returned. The collecting basins 42, 45, the recovery pipes 43, 46, the gutters 44, the switching valves 47, 48, and the return pipes 49, 50 constitute a means for recovering rainwater or an aqueous solution.

The rainwater tank 22 and the antifreezing agent aqueous solution tank 24 are each provided with a water level sensor (not shown) and drainage pipes 51 and 52 for preventing overflow. The drainage pipes 51 and 52 are connected to drainage ports (not shown) provided at the overflow water levels of the rainwater tank 22 and the antifreeze solution tank 24, and are connected to the drainage gutter 54 via the water collecting basin 53 and overflow. It is installed so that it can be drained when the water level is exceeded. Further, the rainwater tank 22 and the antifreezing agent aqueous solution tank 24 are connected to supplementary pipes 61 and 62 which are opened and closed by a water level sensor (not shown), respectively. A concentration sensor 56 for detecting the concentration of the antifreeze agent is provided in the antifreeze agent aqueous solution tank 24 or the suction tube 28 connected to the tank 24. The antifreeze agent aqueous solution tank 24 includes an antifreeze agent replenishment device (not shown) having an antifreeze agent replenishment pipe 57 for supplying the antifreeze agent from the antifreeze agent tank 26.

In addition, a snowfall sensor 58 and an outside air temperature sensor 59 are provided outside the house 12, and the outputs of the concentration sensor 56, the snowfall sensor 58, and the outside air temperature sensor 59 are input to the control device 60. The control device 60 switches the switching valves 29, 30, 47, 48 to open and close based on the signals from the sensors such as the snowfall sensor 58, the outside air temperature sensor 59, and the concentration sensor 56, and operates the pumps 31 and 32. Therefore, an aqueous solution in which an antifreeze agent is mixed with water such as rainwater is circulated and made available.

Next, a method of using the rainwater circulation utilization system 10 of this embodiment will be described. First, rainwater collects in the catchment basin 45 via the rain gutter 40, the downspout 41, the catchment basin 42, and the recovery pipe 43, and the rainwater and the sprinkled water that have fallen on the site 20 also flow into the gutter 44 to collect water. Gutter at Masu 45. The water that has flowed into the water collecting basin 45 is collected in the rainwater tank 22 via the recovery pipe 46 and the switching valve 47 except when it snows. The amount of rainwater stored in the rainwater tank 22 is, for example, 2 m ² to 3 m ² in the case of a general house, and the amount that can be used for about 30 days when used in a flush toilet 38 or the like with the minimum amount used in the event of a disaster. It is good to be.

The antifreezing agent aqueous solution contained in the antifreezing agent aqueous solution tank 24 is a mixture of rainwater and an antifreezing agent, and also includes an aqueous solution recovered via the recovery pipe 46 and the switching valve 48. The antifreeze agent is a freezing point depression agent. As the antifreeze agent used here, at least salts of organic acids, for example, salts of formic acid, acetic acid, propionic acid, succinic acid and the like, sodium, potassium, magnesium, ammonium and the like are used. Preferably, one containing any one of disodium succinate, disodium succinate / hexahydrate, and sodium propionate is used. Disodium succinate, disodium succinate / hexahydrate, and sodium propionate can be produced by fermentation from raw materials such as plants, and since they are plant-derived components, there are problems with toxicity and environmental load. It is safe because it does not contain any ingredients. In particular, disodium succinate and sodium propionate are highly safe compounds used as food additives, are safe and odorless without containing components that cause problems in toxicity and environmental load.

The freezing point of disodium succinate is -11.6 ° C, the freezing point of disodium succinate / hexahydrate is −5.9 ° C, and the freezing point of sodium propionate is −17 ° C. Since the antifreeze agent of this embodiment is solid at room temperature and is water-soluble, it can be handled as a solid or an aqueous solution.

Further, as the antifreeze agent, it is economical and preferable to use it in combination with one or more chlorides selected from chlorides such as sodium chloride, calcium chloride and magnesium chloride. When mixed with these chlorides, the mixing ratio should be 5 to 20 parts by mass of disodium succinate, disodium succinate / hexahydrate, or sodium propionate with respect to 100 parts by mass of the chloride. Is appropriate. As a method of mixing with chloride, for example, a solid chloride agent or an aqueous solution is once prepared, and then a predetermined amount of the freezing point depressant is added thereto to obtain an antifreeze agent.

Disodium succinate (pH 8.9) and sodium propionate (pH 7.7) are weakly alkaline aqueous solutions, but the antifreeze agent to which they are added makes it easy to control the pH and has a pH that complies with water quality regulations. It can be easily adjusted within the range. The sprayed antifreeze agent is recovered together with the melted ice and snow and reused, but since the surplus eventually flows into public water areas, the pH is preferably 9.0 or less due to the regulations of water quality regulations, and further. Is desirable in the weak alkaline region for the protection of equipment such as pipes and pumps.

Further, if it is sprayed on an inclined area such as a roof 14 or a photovoltaic power generation panel 16, it easily flows out, so it is preferable to fix it at the spraying place. Therefore, it is advisable to mix glycerin as a fixing agent. This is because glycerin is odorless, highly safe, and highly sticky. By mixing glycerin with the antifreeze agent of this embodiment, in addition to the above effects, high fixing property is obtained.

In addition, as an antifreeze agent, a liquid antifreeze agent in which glycerin and / or propylene glycol is blended in an aqueous solution based on potassium acetate and the active ingredients are potassium acetate and glycerin and / or propylene glycol can also be used. good. The content of the active ingredient in the liquid antifreeze is 40% by mass to 50% by mass, and the content of glycerin and / or propylene glycol in the active ingredient is 12% by mass to 70% by mass, preferably 21% by mass. % To 50% by mass or less, more preferably 21% by mass to 40% by mass. This is because when the content of the active ingredient in the liquid antifreeze agent is less than 40% by mass, the ability to prevent freezing is not sufficient. On the other hand, when the content of the active ingredient in the liquid antifreeze agent is 45% by mass or less, the liquid antifreeze agent is liquid and the viscosity can be lowered. Further, when the content of glycerin and / or propylene glycol in the active ingredient is 12% by mass or more, the mass reduction rate becomes larger than 50%, and the scaling suppressing effect becomes large. On the other hand, when the content of glycerin and / and propylene glycol in the active ingredient exceeds 70% by mass, the antifreezing effect of the sprayed surface becomes small. Therefore, by setting the content of glycerin and / or propylene glycol in the active ingredient within the above range, the effect of modifying the sprayed surface can be obtained. According to this liquid antifreeze agent, depending on the proportion of the material to be blended, it exerts an antifreeze effect even at a low temperature of about -40 ° C to -70 ° C, prevents freezing, and prevents slips, falls and other accidents on the frozen surface. It can be prevented and is less harmful to the environment.

Next, the operation of the rainwater circulation utilization system of this embodiment will be described. First, when it snows in winter, the control device 60 of the rainwater circulation utilization system 10 activates the pump 31 and activates the switching valve when the outside air temperature becomes, for example, 3 ° C. or less by the outside air temperature sensor 59 and the snowfall is detected by the snowfall sensor 58. 29 and 47 are opened, and the switching valves 30 and 48 are closed. If the outside air temperature is 0 ° C. or higher, there is no risk of rainwater freezing, so the suction pipe 27, pump 31, switching valves 29, 47, and return pipe 49 connected to the rainwater tank 22 are set to communicate with each other. As a result, when snowfall is detected by the snowfall sensor 58 when the outside temperature is between 3 ° C and 0 ° C, rainwater is sent from the rainwater tank 22 to the supply pipe 34 by the pump 31, and passes through the supply pipe 34 to the snowmelt pipe. Rainwater is supplied to 33, the roof sprinkler pipe 36, etc., and snow is removed from the site 20, the roof 14, and the solar power generation panel 16.

Rainwater used for snow removal and the like via the roof sprinkler pipe 36 collects from the roof 14 of the house 12 and the solar power generation panel 16 through the rain gutter 40 and the downspout 41 and collects in the catchment basin 42 in the site 20. It gathers from the pipe 43 to the water collecting basin 45. The rainwater sprinkled by the snowmelt pipe 33 of the site 20 collects in the catchment basin 45 through the gutter 44 and the like of the site 20. Then, the rainwater collected in the water collecting basin 45 flows into the recovery pipe 46, is collected in the rainwater tank 22 via the switching valve 47, and circulates as snowmelt water during snowfall.

The rainwater in the rainwater tank 22 is supplied to the indoor pipe 35, the standing faucet 37 of the site 20, etc. by the control device 60, externally operated or automatically by the pump 31, without going through the switching valve 29, regardless of the outside air temperature. Supplied as needed. Therefore, even when the snow is not erased, the control device 60 operates the pump 31 with the switching valve 29 closed, if necessary. Further, a water level sensor is provided in the rainwater tank 22, and when the water level exceeds a certain level, the rainwater in the rainwater tank 22 is drained to the drainage gutter 54 via the drainage pipe 51 and the water collecting basin 53. On the other hand, when there is a shortage, tap water, groundwater, etc. are supplied via the supplementary pipe 61.

When the temperature drops further and the outside temperature becomes less than 0 ° C, when snowfall is detected by the snowfall sensor 58, an aqueous solution of snow-melting water in which the antifreeze agent is dissolved in rainwater is used to prevent freezing. Supply. Therefore, the control device 60 operates the pump 32, opens the switching valves 30 and 48, closes the switching valves 29 and 47, and closes the suction pipe 28, the pump 32, and the switching valve 30 connected to the antifreezing agent aqueous solution tank 24. 48, switch so that the return pipe 50 communicates. Then, the antifreeze agent and the aqueous solution of rainwater sprinkled by the operation of the pump 32 are discharged from the roof 14 of the house 12 and the solar power generation panel 16 to the site 20 via the rain gutter 40 and the downspout 41 in the same manner as described above. It gathers in the catchment basin 42, and gathers in the catchment basin 45 from the recovery pipe 43. The aqueous solution sprinkled by the snowmelt pipe 33 of the site 20 also collects in the water collecting basin 45 through the gutter 44 and the like of the site 20. The aqueous solution collected in the water collecting basin 45 flows into the recovery pipe 46, is collected in the antifreezing agent aqueous solution tank 24 via the switching valve 48, and circulates as snowmelt water during snowfall.

When the outside air temperature is less than 0 ° C, the switching valve 29 is closed, but rainwater can be supplied by the pump 31 to the flush toilet 38 via the indoor pipe 35, the standing faucet 37 of the site 20, and the like. Keep it. Further, a water level sensor is provided in the antifreeze agent aqueous solution tank 24, and when the water level exceeds a certain level, the aqueous solution in the antifreeze agent aqueous solution tank 24 passes through the drainage pipe 52 and the water collecting basin 53, and the drainage side groove 54. Is drained to. The aqueous solution to be drained is a solution in which succinate or propionic acid salt, potassium acetate, propylene glycol and the like are dissolved as an antifreeze agent, and is harmless to the environment. Further, in the case of an aqueous solution obtained by mixing succinate or propionate with at least one chloride selected from sodium chloride, calcium chloride and magnesium chloride in the above ratio, the environmental load is small as described above. Since the pH is also within a predetermined range, there is no problem even if the water is drained into the drainage side groove 54. On the other hand, when there is a shortage, tap water, groundwater, or the like is supplied via the supplementary pipe 62.

Since the concentration of the antifreezing agent aqueous solution supplied from the antifreezing agent aqueous solution tank 24 becomes low when the snow melts and returns, the concentration of the aqueous solution in the antifreezing agent aqueous solution tank 24 gradually decreases. .. Therefore, when the concentration of the aqueous solution becomes a certain value or less, the control device 60 receives a signal from the concentration sensor 56 from the antifreeze agent tank 26 via the antifreeze agent replenishment pipe 57 by the antifreeze agent replenishment device (not shown). Supply antifreeze. Then, when the concentration of the aqueous solution in the antifreezing agent aqueous solution tank 24 reaches a certain concentration, the control device 60 stops the operation of the antifreezing agent replenishing device by the concentration sensor 56, and stops the supply of the antifreezing agent. By this operation, the concentration of the aqueous solution in the antifreeze agent aqueous solution tank 24 is kept within a certain range.

Next, when the operator wants to cool the photovoltaic power generation panel 16 or the roof 14 or sprinkle water on the site 20 to obtain coolness in summer or the like, the operator controls the control device 60 of the rainwater circulation utilization system 10. The switching valve 29 is operated from the outside, or when the outside air temperature reaches a constant temperature, for example, 25 ° C., the outside air temperature sensor 59 and the control device 60 allow the suction pipe 27 and the supply pipe 34 connected to the rainwater tank 22 to communicate with each other. , 47 is opened to operate the pump 31. As a result, rainwater is sent from the rainwater tank 22 to the supply pipe 34 by the pump 31, and the rainwater is supplied to the snowmelt pipe 33, the roof sprinkler pipe 36, etc. via the supply pipe 34, and the site 20, the roof 14, and the solar power generation are generated. The panel 16 is cooled, the site 20 is sprinkled with water, and the like. In the rainwater tank 22, during the rainy season, the roof 14 of the house 12 and the solar power generation panel 16 pass through the rain gutter 40, the downspout 41, the gutter 44, etc., and the return pipe 49 via the recovery pipes 43 and 46. Is stored in the rainwater tank 22.

The rainwater circulation utilization system 10 of this embodiment stores rainwater and snowmelt water in the rainwater tank 22 and recycles them, so that it can be used not only for melting snow but also for cooling the roof of the house 12 and the photovoltaic power generation panel 16 in the summer. can do. Further, rainwater can be used for washing the toilet 38 with water via the indoor pipe 35 and watering from the snowmelt pipe 33 and the standing faucet 37 of the site 20, which is frequently used throughout the year and is economically efficient. Further, in winter, an aqueous solution of rainwater using an antifreeze agent having no environmental load can perform a snowmelt operation as needed, can efficiently melt snow, and melts snow on the surface of the photovoltaic power generation panel 16. It can also be done, which contributes to the improvement of power generation efficiency in winter.

Since the antifreeze agent used has a small environmental load and is adjusted to be weakly alkaline, it is applied to pumps 31, 32, switching valves 29, 30, 47, 48, and other piping and equipment used in the system. The effect is extremely small, it is suitable for circulating use of the aqueous solution of the antifreeze agent, and drainage can be performed without any problem. Further, since the rainwater tank 22 and the antifreeze aqueous solution tank 24 do not have an open opening, rainwater and the aqueous solution are stored in a shielded space, and the rainwater and the aqueous solution can be circulated and used inside. No algae etc. are generated. Further, in the antifreeze agent aqueous solution tank 24, the antifreeze agent has an antibacterial action, and germs do not propagate.

In addition, in the event of a disaster, rainwater can also be used for flushing toilets, and it also functions as an emergency facility. In addition, by using the power of solar power generation, electric vehicles, and storage batteries, it is possible to guarantee the minimum use of flush toilets and other housing equipment and the securing of water even in the event of a disaster.

The use of the rainwater circulation utilization system of the present invention is not limited to the above embodiment, and is not limited to the above-described embodiment, but is limited to housing equipment, public facilities such as city halls, public halls and libraries, commercial facilities such as shopping centers, office buildings, and other airports. , It may be used for equipment such as railways, snow removal equipment such as parking lots, water supply equipment, etc. In particular, the rainwater circulation utilization system of the present invention can recover oil such as fuel that has flowed out at an airport or the like, and separate and discharge the collected upper oil in the rainwater tank 22 or the antifreezing agent aqueous solution tank 24. , Only the oil can be separated and recovered. Therefore, it is possible to use a device that also serves as an oil-water separation device, which enables efficient use of equipment and suppresses equipment cost.

By using it for these purposes, it is possible to make an environmentally friendly and economical rainwater utilization system, and it can also be used as a water supply facility such as a flush toilet together with a solar power generation panel and a storage battery even in the event of a disaster. In addition, the installation position of piping, the capacity and number of pumps, and the number of switching valves can be set as appropriate. The aqueous solution tank 24 may be switched so that it can be supplied to a plurality of pipes. Further, regardless of the snowfall sensor or the temperature sensor, the pump may be manually operated to sprinkle water, or a temperature sensor or the like may be provided on the solar panel to sprinkle water at a predetermined temperature. It does not matter how to detect or sprinkle snow. The type of antifreeze agent can be appropriately selected as long as it has a small environmental load.

10 Rainwater circulation utilization system 12 House 14 Roof 16 Solar power generation panel 18 Entrance 20 Site 22 Rainwater tank 24 Antifreeze agent aqueous tank 26 Antifreeze agent tank 27,28 Suction pipe 34 Supply pipe 29,30,47,48 Switching valve 31 , 32 Pump 33 Snow melting pipe 35 Indoor piping 36 Roof sprinkler pipe 37 Standing faucet 38 Washing toilet 40 Rain gutter 41 Vertical gutter 42, 45, 53 Water collecting basin 43, 46 Recovery pipe 44 Side groove 49, 50 Return pipe 51, 52 Drainage Piping for drainage 54 Drainage side groove 56 Concentration sensor 57 Antifreeze agent Replenishment piping 58 Snowfall sensor 59 Outside temperature sensor 60 Control device 61, 62 Replenishment piping

Claims (9)

A rainwater tank that stores the recovered rainwater, an antifreeze agent aqueous solution tank that stores an aqueous solution of rainwater mixed with an antifreeze agent containing at least an organic acid salt, and an aqueous solution of the rainwater in the rainwater tank and the antifreeze tank. A switching valve that selectively sends out the rainwater, a pump that sends out the rainwater or the aqueous solution selected by the switching valve, and a pipe that delivers and sprinkles the rainwater or the aqueous solution sent out by the pump to a predetermined place. A recovery means for recovering the rainwater or the aqueous solution sprinkled from the pipe, an outside temperature sensor for detecting the outside temperature, and a control device for controlling the switching valve and the pump by inputting the output of the outside temperature sensor. Prepare,
When the outside air temperature is higher than a predetermined temperature within 3 ° C. to -3 ° C. by the outside air temperature sensor, the control device pumps the rainwater from the rainwater tank. When the temperature is lower than the predetermined temperature, the switching valve is switched so that the aqueous solution can be sent from the antifreeze aqueous solution tank to the pump, and the rainwater or the aqueous solution can be sent through the pipe. A rainwater circulation utilization system characterized by making it possible to sprinkle water. The rainwater circulation utilization system according to claim 1, wherein the organic acid is acetic acid, succinic acid, or propionic acid. The rainwater circulation utilization system according to claim 2, wherein the salt of the organic acid is potassium acetate, disodium succinate, disodium succinate / hexahydrate, or sodium propionate. The antifreezing agent is a freezing point depression agent composed of at least one chloride selected from sodium chloride, calcium chloride and magnesium chloride and succinate, with respect to 100 parts by mass of the chloride. The rainwater circulation utilization system according to claim 1, which comprises a mixture of 5 to 20 parts by mass. The antifreezing agent is a freezing point depression agent composed of at least one chloride selected from sodium chloride, calcium chloride and magnesium chloride and propionate, with respect to 100 parts by mass of the chloride. The rainwater circulation utilization system according to claim 1, which comprises a mixture of 5 to 20 parts by mass. The control device makes it possible to deliver the aqueous solution of the antifreeze aqueous solution tank to the piping when the outside air temperature becomes lower than a predetermined temperature within 0 ° C. to -3 ° C., and the switching valve. The rainwater circulation utilization system according to any one of claims 1 to 5. The pipe is connected to a roof sprinkler pipe provided on the roof of a house, a photovoltaic power generation panel is installed on the roof, and the roof sprinkler pipe is provided on the surface of the solar power generation panel so as to be able to sprinkle water. The rainwater circulation utilization system according to any one of claims 1 to 6. The antifreeze agent aqueous solution tank is provided with a concentration sensor for detecting the concentration of the aqueous solution, and a container containing the antifreeze agent is provided adjacent to the antifreeze agent aqueous solution tank, and the antifreeze agent aqueous solution tank is provided. The rainwater circulation utilization system according to any one of claims 1 to 7, further comprising an antifreezing agent replenishing device for charging the antifreezing agent into the antifreezing agent aqueous solution tank when the concentration of the aqueous solution falls below a certain value. .. The rainwater tank and the antifreeze aqueous solution tank do not have an open opening, and the rainwater or the aqueous solution is stored in a shaded space, and the rainwater and the aqueous solution are circulated and used. One of the described rainwater circulation utilization systems.

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