Heating systems – Ventilating
Reexamination Certificate
2000-02-02
2001-11-27
Joyce, Harold (Department: 3744)
Heating systems
Ventilating
C454S238000, C454S251000
Reexamination Certificate
active
06321997
ABSTRACT:
BACKGROUND
There are several disadvantages concerning use of a combustion furnace in houses and similar buildings. In order to supply air for combustion, cold air are drawn in from various leaks in the building. Draughts and unequal temperature allocation will thus arise, with high temperatures around the furnace and cold spots at areas where the cold air is drawn in.
From Norwegian patent publication 59825, blowing air around a furnace is known. Simultaneously, it is suggested to suck outdoor air into the room. This heat exchange offers poor control of the air currents, both concerning whereform and whereto. The furnace temperature is reduced as is the corresponding combustion efficiency.
In U.S. Pat. No. 2,610,565 the inner negative pressure in rooms with combustion furnaces, is reduced by sucking in filtered outdoor air. In this way the suction of uncontrolled and unfiltered air gets moderated. However this solution does not remove the disadvantages concerning the unequal temperature allocation in the building and the creation of condensation in cold and damp areas.
In addition to the combustion- and heating problems which hopefully will be improved, there is an unfortunate collection of gasses and evaporation in certain areas, in many houses or the similar with combustion furnaces. Gasses can originate from the foundation or may be secreted from cigarettes, products in the building or from pollution.
OBJECT
The main object of the invention is to create a method and a device of the said kind, which better utilizes the heat energy which is created in the combustion, and which offers a more uniform allocation of the temperature over the whole area which is to be heated. A special object is to draw in outdoor air, and supply it so that these conditions are optimal.
A further object is to raise the temperature at the coldest places in the area which are to be heated, where there may be poor insulation and/or draught, e.g. to avoid condensation of moisture.
Another object is to remove cold air and undesirable gasses from the building.
THE INVENTION
The method according to the invention is stated in patent claim 1, dependent claims states the advantageous details. Further patent claims 4-8 describe an embodiment of the device which is suited to carry out the method.
The invention relates in one respect to a method for utilizing the heat energy of a furnace, in a building such as a house, whereby the inside of the building is supplied with fresh outdoor air by a fan device, and this air is heat exchanged with the smoke tube of the furnace and released into the interior of the house.
According to the invention the interior of the building is supplied with enough outdoor air to establish an overpressure compared to the pressure outside the building.
The technical effect following use of combustion furnaces in buildings with an interior overpressure, made of preheated outdoor air, is that drifting of cold outdoor air through the ordinary leakage-points of the house, for example windows, door frames, and keyholes, are eliminated. The net positive effect of this is that the temperature of the air in the building generally becomes more uniform, and the danger of formation of moisture and rot damage at the ordinary leakage points is reduced.
Secondarily, there will always be an overpressure in the air supply to the furnace, compared to the pressure at the flue outlet, and in this way, the furnace is operated with increased oxygen supply, which in turn increases the combustion effect and utilization of the fire wood. It is also possible to reduce the spill of noxious gasses through the higher temperature in the smoke tube. Another positive effect of the invention is especially experienced when firing, since it gets a lot easier to set fire to, for example, fire wood in a wood-burning stove. One will therefore achieve a generally more uniform room temperature with lesser fuel consumption.
The term “overpressure” used herein, means that a differential pressure should be established which is sufficient to reverse the air current in leakage points and air exhaust lines, to a small outgoing current, which in turn will be sufficient to establish the technical effect which is sought by the invention. Therefore there are moderate claims to the effect of the fan.
The preheated fresh air is advantageously led straight to the area by the furnace. The preheating of the air can take place in an arbitrary familiar way, for example by using a mantel around the smoke tube. Such a technical solution requires a small building volume, and consequently low costs for installation and maintenance.
The outlet device can in its simplest form, be the natural leakage points in the house, for example a valve, but particularly in newer buildings it is preferred to use a dedicated outlet device, for example a dedicated overflow valve which is shaped for this object. It is preferred that the overflow valve is placed at normally cold places, for example at the floor level in lower places in the building.
In a basic, but preferred embodiment of the invention, the overflow valve is a self-regulating check valve, especially a membrane valve, which is arranged to close when the external pressure is higher than the pressure in the interior of the building, and to open at a pressure which is insignificant higher than the outdoor pressure.
In another embodiment, the overflow valve can be a distant regulated valve, connected to a regulator which coordinates intensity of the fan for supply of outdoor air, and opening of the outlet device via pressure values which are registered at pressure sensors for measuring the differential pressure between outdoor and the interior of the building. In houses with an extract fan for example in the kitchen, it could be appropriate to coordinate the intensity of the fan for fresh air and the intensity of the extract fan.
In windy areas where there are high winds much of the year, it could be appropriate to place more outlet devices at different wall sections in order to avoid stagnation pressure from outdoor wind which would otherwise restrain removal of excess air from the interior of the building.
It should also be mentioned that the method and device according to the invention can be used at warmer times of the year also, in order to establish sufficient air change in the building. By help of lower air outlets, the problems concerning accumulation of possible radongass and similar, are also avoided.
REFERENCES:
patent: 169300 (1875-10-01), Satterlee
patent: 2610565 (1952-09-01), Stuart
patent: 3611906 (1971-10-01), Lorenz
patent: 4022117 (1977-05-01), Mallian
patent: 4184538 (1980-01-01), Rauenhorst
patent: 4270513 (1981-06-01), Mitchelson
patent: 4280474 (1981-07-01), Ruegg, Sr.
patent: 4498624 (1985-02-01), Kogut
patent: 4538508 (1985-09-01), Ballard
patent: 5131887 (1992-07-01), Traudt
patent: 5191874 (1993-03-01), McWilliams
patent: 5984773 (1999-11-01), Gervais et al.
Boles Derek S.
Dennison, Scheiner Schultz & Wakeman
Joyce Harold
LandOfFree
Method for operating a stove in a building, and a device for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for operating a stove in a building, and a device for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for operating a stove in a building, and a device for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2609201