JP2009270412A - Chemical road heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for melting snow on a road surface, wherein a heat-storage material containing sodium acetate as a main component changes ambient temperature of warm water so as to cause a state change, which is used for storing and dissipating heat of energy while low-temperature water is constantly circulated in a road-heating pipe. <P>SOLUTION: By using a heat-storage material 3 containing sodium acetate as a main component, an electric energy given by an electric heater 5 is amplified more than twice for storing the energy while warm water as an always-low-temperature water is circulated from a spare chamber 2 to a road-heating pipe 11, so as to warm a road surface for twenty-four hours and thus to melt snow. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  Using the surplus power at night, the electrical energy is stored and stored with warm water and heat storage materials. An energy-saving chemical road heating system that circulates the warm water in the daytime to the road heating pipe and melts the road surface.

Most conventional load heating systems are so-called kerosene boiler systems that directly consume fossil fuels. However, the recent rise in oil prices has hit the economic burden of residents and makes it difficult to use road heating continuously. Furthermore, CO ₂ emissions must be avoided as much as possible to prevent global warming. In general, road heating is a system that uses kerosene boilers as a heat source and uses the high calorific value of kerosene to melt snow on the road instantaneously in combination with a snowfall sensor. For this reason, much energy is consumed, and the amount of CO ₂ emission is considerable. Reduction of energy consumption and suppression of CO ₂ emissions are urgent issues for the global environment, and development of such systems is desired.

The advantage of the conventional kerosene boiler is that it can secure a high calorific value, can instantly feed high temperature to the road heating pipe, and facilitates snow melting on the road. However, the disadvantages are excessive energy consumption and a large amount of CO ₂ emission, which is extremely worrying from the viewpoint of preventing global warming. Therefore, in the present invention, hot water is continuously circulated for 24 hours in a low temperature range to attempt to melt snow.

  A heat storage tank consisting of a heat storage chamber and a spare chamber containing a heat storage material (a compound containing sodium acetate as a main component) in water is installed in the underfloor space. The heat storage material melts when the surrounding water temperature becomes 57 ° C. or higher, and solidifies when the temperature becomes 56 ° C. or lower. When it is solidified, it generates heat and releases heat around it. Utilizing this characteristic, the hot water temperature of the heat storage chamber is raised to 57 ° C. or more by using an electric heater using surplus power at night, and electric energy is stored in the form of hot water. Hot water is sent from the heat storage chamber to the road heating pipe through the spare chamber and melted. Since this water supply temperature is in a relatively low temperature range, it is basically a system that continuously supplies water for 24 hours to cope with snow melting.

According to the present invention, it is possible to expect the effect that water at a low temperature is always supplied to the road heating pipe, the road surface is always kept in the plus region, and snow does not accumulate on the road. From the viewpoint of energy consumption, it can output about twice as much energy as the input electric energy, it is extremely rich in energy saving, greatly reduces CO ₂ and contributes to the prevention of global warming.

  An embodiment according to the present invention in which two tanks and an electric heater are connected, and on the one hand, water can be sent to a load heating pipe by a circulation pump.

Overview of the present invention Hot water circulates from the heat storage chamber 1 by the circulation pump 4, and the hot water is heated by the electric heater 5. The heated hot water passes through the pipe 8 via the electric three-way valve 6 and is circulated to the heat storage chamber 1. Hereinafter, this cycle is repeated as the first circulation circuit. When the heat storage material 3 in the heat storage chamber 1 is warmed with warm water and the water temperature in the heat storage chamber 1 is raised to 57 ° C. or higher, the state changes to a liquid state. Here, the electric energy input by the electric heater 5 is stored by liquefying the heat storage material 3 in the heat storage chamber 1. The stored hot water is circulated to the load heating pipe 11 by the circulation pump 10 via the preliminary chamber 2 and warms the road surface. The hot water cooled by the load heating pipe 11 enters the heat storage chamber 1 via the electric three-way valve 12. Hereinafter, this cycle is repeated as the second circulation circuit. The chemical road heating system is constituted by circulation of hot water in the first circulation circuit and the second circulation circuit. The temperature sensor 15 and the temperature sensor 9 are devices capable of catching the temperature of the hot water in the heat storage chamber 1 and the spare chamber 2 and adjusting the room temperature of each.

Explanation of symbols

1. Thermal storage room 9. Temperature sensor Spare room 10. Circulation pump Heat storage material 11. Road heating pipe 4. Circulation pump 12. Electric three-way valve 5. Electric heater 13. Piping 6. Electric three-way valve 14． Piping 7. Piping 15. Temperature sensor 8. Piping

Claims (5)

  A tank separated into two tanks will be installed under the floor of a general house. The tank is divided into two tanks, a heat storage chamber in which a heat storage material is inserted and a spare chamber. Circulate water from the heat storage chamber with a circulation pump and connect it to an electric heater. It circulates in the circulation pipe from the electric heater and circulates in the heat storage chamber. An electric three-way valve is installed in the pipeline from the electric heater to the heat storage chamber, and is a device that can circulate to the spare chamber.   The heat storage material inserted into the heat storage chamber is contained in a container made of polypropylene. The heat storage material is a compound mainly composed of sodium acetate. When the surrounding hot water reaches 57 ° C or higher, it melts and changes to a liquid state. When the temperature of the surrounding hot water is lowered to 56 ° C. or lower, the heat storage material is solidified and changes to a solid state. When the state changes to this solid, the heat storage material generates heat. A device that connects the heat storage chamber and the electric heater so that the heat storage material of this heat storage chamber can change its state.   The tank's spare room installed in the underfloor space is connected to a circulation pump so that hot water can be circulated through a road heating pipe buried on the outdoor road surface. The hot water passing through the load heating pipe is a device that can circulate to the spare room or the heat storage room by an electric three-way valve.   The heat storage materials in the heat storage chamber are installed with shelves and partitions so as not to overlap each other. A device configured to allow the hot water in the heat storage chamber to circulate smoothly between the heat storage materials.   Temperature sensors are installed in the heat storage chamber and the spare room, respectively, and each system device can sense the room temperature water temperature and change the hot water circuit with an electric three-way valve.

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