Electric resistance heating devices – Heating devices – Combined with nonelectric heating means
Patent
1997-07-10
1999-08-10
Walberg, Teresa
Electric resistance heating devices
Heating devices
Combined with nonelectric heating means
392310, F24C 100
Patent
active
059371390
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT application PCT/EP96/00800 filed Mar. 1, 1996 with a claim to the priority of German application 195 08 324.5 itself filed Mar. 9, 1995.
FIELD OF THE INVENTION
The invention relates to a portable hot-air blower for at least two of the three forms of energy--oil (also diesel and fuel oil), liquid-petroleum gas, and electricity--with a tubular or tunnel-shaped housing.
Portable heaters of the described type have hitherto only been set up for one of the three forms of energy. In them the motor for driving the blower moving the air is always electrically powered. Such portable hot-air blowers are used generally in construction, in farming, for thawing, tempering, and for frost protection of pipes and equipment as well as emergency heaters. The main requirements of such a portable hot-air blower are the greatest possible mobility, the smallest size, and the lightest weight as well as the possibility of use in many applications.
Heaters for more than one form of energy are known for stationary use. Thus there are stoves, hot-air furnaces, cooking vessels, heaters, heat exchangers, and hot water heaters with devices for the alternate or simultaneous use of different forms of energy.
German published application 3,236,242 describes for example a fan-less space heater for solid fuel which is provided for augmenting the heat output with electrical heating elements that can be used alone during transitional times for space heating.
A retrofit electrical heater for water heaters using solid or liquid fuel is further known from German utility model 7,419,316.
A stationary ventilator-assisted heating element is furthermore known from German utility model 9,319,704 which is formed of a hot-water and night-current storage element and/or heatable ceramic plates.
The above-described known devices do not meet the requirements with respective to safety, venting, environmental concerns, size, and weight of the known portable hot-air blowers.
Portable hot-air blowers with low weight and which can easily be carried or moved are only known to date for one of the three energy forms. With them the motor for moving the required amount of air is always electrically powered. Such portable hot-air blowers are used in many applications, in agriculture, to thaw, warm, and prevent from freezing pipes and equipment and as emergency heaters. The requirements for such a hot-air blower are the greatest possible portability, the smallest size, and the smallest weight as well as many applications of use. These hot-air blowers have a tubular or tunnel-shaped construction.
Since the hot-air blowers of the known type are only set up for one form of energy they are burdened with energy-specific disadvantages. Thus oil-fired devices are the most effective with respect to energy costs; but their use for devices without heat-exchangers and venting is limited to well vented spaces. As a result of the mixing of the exhaust gases with the room air the known hot-air blowers are in particular not suitable for heating spaces in which men, animals, or plants remain.
The hot-air blowers fired with liquid-petroleum gas on the other hand are more expensive with respect to energy and require--like oil heaters--good venting of the space being heated. They increase humidity and cannot be used below ground. Nonetheless, men, animals, and plants can be exposed for long periods in rooms heated with liquid-petroleum gas.
Electrically powered hot-air blowers have no requirements with respect to venting; they are best suited for long-term exposure of men, animals, and plants. Since with electrically powered hot-air blowers no flame must be ignited they also start at very low temperatures and under any atmospheric conditions. Alone of the three groups of hot-air blowers the electrically powered hot-air blowers can be used with great operational safety over the long term since electricity is always available to produce heat energy so that shutdowns--as necessary for the periodical
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"Gas/electric Dual Fuel Heater Durotherm" 1997.
Dubno Herbert
Van Quang
Walberg Teresa
Wilford Andrew
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