JP2009002637A - Hybrid heat transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that as an example of a heat transfer facility, in many cases, an electric heating method and a hot water circulating method have been used for road heating hitherto and the reconstruction of a road heating facility is required when a heat source is changed, and thus, to provide a hybrid heat transfer device capable of freely selecting a heat source without reconstructing the road heating facility. <P>SOLUTION: A metallic pipe 2 is used for a heat transfer facility such as a road heating facility 1. Liquid 10a such as hot water and anti-freeze solutions or gas 10b such as hot air is made to pass through an inner space of the pipe 2 arranged so as to form a single line, and electrodes are connected to metallic pipe both ends 9 to make electricity flow and generate heat. This can fitly select a plurality of economical heat sources corresponding to a required heat quantity and control them. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hybrid heat transfer device capable of generating heat by flowing electricity to a metal pipe at the same time in addition to a method of transferring heat using liquid and gas used as a heat medium through a pipe.

Pipes are used for heat transfer and heat transfer using conventional liquids such as hot water and antifreeze and gases such as hot air. On the other hand, a method of transferring heat by an electric heating element is also used.
However, when a liquid or gas is used for the heat medium and when an electric heating element is used, the heat transfer facility must be a separate facility.

Thus, as what integrated separate heat transfer facilities with the heat source, in patent document 1, the tube which circulates a heating wire and a liquid is integrated, and the method of reducing use of energy is proposed.
JP 2006-337010 A

Recently, as a measure against global warming, it is desired to suppress the emission of greenhouse gases, and the use of natural energy and unused energy is demanded. For this purpose, there are a wide variety of heat media such as liquids, gases, and electric heating elements. However, if heat transfer facilities are not integrated, a wide variety of heat sources cannot be used efficiently and effectively.
If liquid, gas, and electric heating element can be used for heat transfer with a single pipe, a plurality of heat sources can be freely selected according to the required amount of heat. As a result, it is possible to reduce greenhouse gases and control to minimize the amount of fossil fuel used.

  In Patent Document 1 in which both the electric heating method and the hot water circulation method can be used, it is difficult for the covering material of the heating wire to reduce the heat transfer effect and to make the heat conduction uniform depending on the position of the tube and the heating wire. In addition, by integrating the circulating fluid tube and the heating wire and covering with a protective seal, the cross-sectional area of the one-line cable becomes large and the workability is difficult.

  The present invention uses metal pipes in the heat transfer facility. A gas such as warm water / antifreeze liquid or warm air is passed through the inner space of the metal pipe to play a role of heat transfer and heat transfer. At the same time, electrodes are attached to both ends of the metal pipe to cause electricity to flow and heat the metal pipe.

  There are differences in heat resistance, strength, weight, corrosion, etc. in the material of metal pipes, and there are also differences in price. Examples of metal pipes include aluminum alloy, nichrome, stainless steel, nickel, etc., but any material may be used as long as heat is generated by applying electricity and suits the purpose of use.

  In order to prevent corrosion of the metal pipe and electric shock caused by flowing electricity, the inner and outer surfaces of the metal pipe can be covered with polyethylene. Even if the metal pipe is covered with polyethylene, the thickness of the pipe is increased by several mm, and there is almost no difference from the construction of the conventional hot water circulation pipe.

  By using the metal pipe in the heat transfer facility as described above, it is possible to select both heat transfer due to heat generated by the heating wire simultaneously with movement and heat transfer of the liquid and gaseous heat medium. As a result, a plurality of heat sources can be freely selected according to the required heat quantity, and energy can be used efficiently.

  If the selection of heat sources is expanded in this way, natural energy (geothermal, solar heat, wind power), unused energy (building ventilation exhaust heat, drainage heat), heat sources such as fuel cells that are expected to spread in the future, main heat source or auxiliary heat source It becomes easy to use as. In the future, it will be possible to select a heat source for the hybrid in combination with electricity, gas, and kerosene that have been used in the past, and to carry out optimal control to produce an efficient, environmentally friendly and economical heat transfer device.

  When geothermal is used as a heat source, the geothermal temperature can be used as an indoor cooling heat source in summer because the annual temperature difference is smaller than the outside air temperature. Also, in winter, it is used as an auxiliary heat source for indoor heating, so that it can be optimally controlled along with electricity, gas, and kerosene to achieve energy savings. Moreover, as a heat collecting method for geothermal heat, the heat collecting tube installation cost is extremely low by inserting the heat collecting tube in a spiral shape into a foundation placing pile.

  As other heat sources, a combination with natural energy (solar heat, wind power), unused energy (building ventilation exhaust heat, waste heat), or future development energy (fuel cell) is preferable.

  Hereinafter, the load heating which shows embodiment of this invention is demonstrated using FIGS. 1-3.

  As shown in FIG. 3, the pipe 2 used in the load heating facility 1 is coated with polyethylene 4 on the inner surface and outer surface of the metal pipe 3 to provide corrosion resistance and electric shock prevention measures, and is piped in a single stroke. The joint 6 between the metal pipe 2 and the heat collecting pipe 5 is an insulating type.

  Piping shall be a pipe arrangement that has been proven in the hot water circulation system, the pipe diameter is 13 mm, the pipe arrangement interval is 150 mm, and the pipe embedding depth is 60 mm. (See Figs. 1 and 2)

  As a residual heat source for road heating, the antifreeze liquid 10a, which is constantly heat-exchanged by geothermal heat, is circulated. The heat collection tube (13 mm polyethylene 5) is inserted into a foundation placing pile of the building in a spiral shape, and the antifreeze liquid 10a is circulated by the circulation pump 11a. When the gas 10b such as exhaust gas is circulated, the blower 11b is used.

  Electricity is supplied from the switchboard 7 to the electric wire 8 and joined to both end portions 9 of the metal portion 3 of the metal pipe 2.

  The antifreeze that has been heat-exchanged by geothermal heat is circulated at all times, but when the snowmelt road surface temperature is -2 ° C or lower and during snowfall, the heat source is controlled so as to generate heat to promote snowmelt.

  In this embodiment, the electric power required to raise the temperature of the metal pipe by 1 ° C. is 28.2 watts (W) per square meter.

  It is a top view which shows the snow melting system which is embodiment which concerns on this invention.   It is the sectional view on the AA line of FIG.   It is sectional drawing which coat | covered the inner surface and the outer surface to the metal pipe which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Road heating facility which shows embodiment 2 Pipe which coat | covered inner surface and outer surface to metal pipe 3 Pipe main material (metal)
4 Pipe covering material (polyethylene)
5 Polyethylene pipe (heat collection pipe)
6 Electrical Insulation Joint 7 Switchboard 8 Electric Wire 9 Joint between Metal Pipe and Electric Wire 10a Antifreeze 10b Hot Air 11a Circulation Pump 11b Blower Fan 12 Snow Melting Road Pavement (Asphalt and Concrete)
13 Roadbed material (gravel or crushed stone)

Claims (1)

  A metal pipe is meandered in a single stroke, and liquid such as hot water or antifreeze is circulated by a pump as a heat medium in the interior of the metal pipe. Alternatively, when the heat medium is a gas such as warm air, it is circulated using a blower. At the same time, an electrode is bonded to both ends of the metal pipe, and a heat transfer device capable of generating heat by flowing electricity.

Images