JPS6393975A - Thawing method - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to roofs of houses, warehouses, shops, etc., gates, parking lots,
This invention relates to a simple snow melting method for melting and removing accumulated snow in workplaces, gardens, etc.

(Prior art and its problems) Conventionally, various methods have been adopted for snow melting in areas with heavy snowfall, such as the use of groundwater and snow melting using electric heat. However, when these methods are used to remove snow from the roofs or near the entrances and exits of homes, shops, etc., many problems arise.

In other words, when using groundwater, it costs a lot of money to dig wells to pump it up.Nowadays, groundwater is used to remove snow from roads in various places, which causes depletion of the groundwater vein and damage to the ground. This causes problems such as subsidence, which is restricting the use of groundwater.Furthermore, there is the problem that corrugated iron roofs and rain gutters are corroded by the toxic substances contained in the water.

On the other hand, the method of melting snow using electric heat requires a large amount of equipment, and due to the high cost of electricity, maintenance costs are also high, making it difficult to spread to the general public.

(Means for Solving the Problems) The present invention solves the above problems by reusing water obtained by melting snow, and efficiently removes snow at low cost using a simple device. This method aims to provide a snow melting method that can melt snow by storing hot water from a boiler in a hot water storage tank and mixing this hot water with cold water from a pool.
The idea is to prepare lukewarm water at 5°C and sprinkle it on snow to melt the snow, and collect the water into a pool for reuse.

To explain this, the present inventors have repeatedly studied various methods for efficient snow melting, and have found that (1) the conditions for snow melting by watering are water that has a large temperature difference from the snow, which is generally considered to be effective in the past; In other words, it is more effective to use water with a small temperature difference from the snowfall, that is, water with a relatively low temperature of 2°C or more, for wrecking, rather than using water with a relatively high temperature of around 15°C, such as groundwater. We found that the same tendency was observed for compacted snow and frozen snow, and (2) compared to groundwater, water obtained by melting snow contains almost no harmful substances. (3) If the water from this melting snow is reused, large amounts of trees can be freely grown without causing the harm caused by pumping up groundwater. (4) If the temperature of the wood used for snow melting is low, the cost of fuel required for it is also low, and so on. be.

Next, details of the present invention will be explained based on embodiments shown in the drawings. Figure 1 shows an outline of the snow melting method according to the present invention. In the figure, 1 is a boiler, 2 is a hot water storage tank for storing hot water heated by the boiler, and 3 is a snow melting tank for storing water. It is a swimming pool. Here, it is desirable to use a general-purpose water heater as the boiler l, and the pool 3 can be either a pond or an aquarium.
The water is heated to 0°C and sent to the hot water storage tank 2, where it is stored. At this time, the cold water heating operation may be performed intermittently by automatically detecting the liquid level according to the hot water consumption state in the hot water storage tank 2, thereby saving fuel for the boiler 1. The cold water in the pool 3 is mixed with the hot water in the hot water tank 2 in the mixer 5.
There, the water is mixed at a temperature of 3 to 15 degrees Celsius, preferably 5 to 8 degrees Celsius, depending on the snowfall condition and outside temperature at that time, and then pumped through a pump 6 to the rooftops 7 of housing dispute shops, parking lots, and entrances. Water is sent to the concrete surfaces 8 such as, and the snow that has fallen on these places is collected by an appropriate number of water sprinklers 9 and water pipes 10 installed on each of the concrete surfaces 8.

Water is sprinkled on the surface. When the snow melts, trees are sprinkled with water,
The water is collected in the pool 3 via the gutter 11 and the vertical gutter 12, or a groove (not shown), and is provided for reuse.

Note that the mixer 5 marked with L has the structure shown in FIG. There is no fear that the amount of hot water supplied will fluctuate even if there is a fluctuation in the pumping pressure, and the temperature of the mixed supply water can always be kept constant by adjusting the opening degree of the valve 16 of the hot water supply pipe 13. .

On the other hand, conventional watering methods for snow melting include a method using a watering pipe with a large number of small holes drilled in rows in the axial direction, and a method using a sprinkler. In this method, when watering on a roof with a large slope, the flow of wood from the small holes becomes linear due to surface tension.
The snow on the roof forms a tunnel and flows away, or the linear running water becomes a blind spot where new snow can be seen. Also, with the latter method using sprinklers, the sprinkler area is circular. In either case, it was not effective in removing snow on the roof because the water was not sprayed evenly.

FIG. 3 shows an example of the countermeasure, and the water sprinkler 9 according to this example has an umbrella-shaped cap 19 provided above the open end of a branch pipe 18 installed perpendicularly to the water supply pipe 17. ,
Water traveling through the branch pipe 18 bounces off the inner wall surface of the cap 19 and is uniformly sprayed diagonally downward over the entire circumference of the cap 19 without creating a blind spot. If the water sprinklers 9 are arranged at equal intervals along the water supply pipe 17 so that the sprinkled areas cover the entire roof, snow accumulation can be completely removed without causing water spots.

In addition, if a solenoid valve is provided at a suitable location on the rising water supply pipe 15 for watering, water can be completely drained by opening and closing the solenoid valve.
It is possible to prevent damage to the pipe body due to freezing of water inside the pipe when not in use. On the other hand, as shown in Fig. 4, in the horizontal water supply pipe 20, by drilling a small hole 21 with a diameter of about 2 m in the appropriate place on the bottom, water can be completely drained when not in use, and trees can accumulate. Prevent ice from forming and interfering with watering.

In addition, the receiver may be blocked by snow accumulation in the gutter 11, or the water that has accumulated at the bottom may freeze and flow when water is supplied, causing the gutter 11 to flow.
In order to prevent the flow of water from blocking the outlet of the tank 2, the hot water heated by the boiler 1 can be directly supplied, or the hot water in the hot water storage tank 2 can be supplied using the pump 22 (see Fig. 1). It is desirable to supply it into the gutter to melt snow or ice.

(Test example) Next, specific embodiments of the present invention will be explained using test examples.

Concrete is poured in front of the gate, in front of the entrance and in front of the veranda, with a gentle slope, and the snow melt from the gutter 11 is sprinkled from the sprinkler pipe 10 installed by the tree, and the flowing water flows through the groove. The pipes are arranged so that all the water naturally gathers in the pool 3, and three water supply pipes 17 are arranged on the roof, and each water supply pipe 17 is equipped with a water sprinkler 9 of 1,200 water as shown in Fig. 3. The piping was done in the same way as shown in Figure 1, except that 8 pieces were installed for each height, for a total of 24 pieces.

Water temperature 1 to 2 stored in water collection pond 3 with volume % 5,000 mon
Output 28,000kcal using pump 4 with cold water at ℃
Compoi 260 type water heater (manufactured by Noritz, product name)
1 and heated it to 60°C, and poured the water into a hot water storage tank 2 with a capacity of 501, filling it up in 4 minutes.

First, this warm water was sent into the gutter 11 using the pump 22 to melt the ice in the gutter. After that, 5°C lukewarm water prepared by mixing the hot water in the hot water storage tank 2 and the cold water in the water collection pond 3 is sent to the roof 7 at a flow rate of 45 cycles/min using the pump 6, and is poured onto the snow. Water was sprinkled from sprinkler 9. The snow melts from the trees and the sprinkled water passes through the gutter 11 and vertical gutter 12.
The water was introduced into a water sprinkler pipe 10, sprinkled on the snow on the concrete surface 8 to remove snow, and collected into the water collection pond 3 through a ditch. roof top 7
All of the snow on concrete surface 8 melted, and even during subsequent snowfall, no snow was observed at the watering locations.

When supplying water under the above conditions, the time required to use up all the hot water in the hot water storage tank is 26 minutes, and the combustion time of the water heater required to continue supplying water to the roof for one hour is approximately 8 minutes. The combustion time required to continue watering for 24 hours is 3.4 hours, and the amount of kerosene consumed is 3.6! ; due to LIH - about 121 per day. In the end, in 1981,
The total cost of kerosene used each time it snowed from February to March of the following year was approximately 50,000 yen, which was extremely economical.

(Effect of the invention) According to the method of the present invention, the following effects are achieved.

1, 11! Snow melting is a method of melting snow by reusing water without using sewage, so there is no need to dig wells to use groundwater, and there is no risk of corrosion of tin roofs.

2. Snow melting uses low-temperature water to melt snow, so maintenance costs such as fuel costs are low and it is economical.

3. The device is simple, the equipment cost is low, and the operation is easy.

[Brief explanation of the drawing]

The drawings are all related to embodiments of the present invention, and the drawings include the first embodiment.
The figure is an explanatory view showing the outline of an apparatus for carrying out the method of the present invention, and FIGS. 2 to 4 are enlarged explanatory views of the main parts of the apparatus, respectively. 1 unit・φ boiler z meeting・3 hot water storage tanks・war・pool

Claims (1)

[Claims] The hot water from the boiler is stored in a hot water storage tank, and this hot water is mixed with cold water from the pool to create lukewarm water of 3 to 15 degrees Celsius. This is sprinkled on snow to melt the snow, and the melted snow is poured into the pool. A snow melting method characterized by collection and reuse.