Heating systems – Ventilating – Enclosed radiator
Patent
1985-08-12
1987-08-25
Bennet, Henry A.
Heating systems
Ventilating
Enclosed radiator
98 61, 237 55, F23L 1702
Patent
active
046884734
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wing guard device for the purpose of sustaining a gentle flow of gas in a gas passageway between a building and the atmosphere surrounding the building. The expression gas passageway is used here to denote particularly, but not exclusively, a ventilation duct for ventilation air which flows through natural draught.
BACKGROUND ART
The ventilation in the majority of old houses occurs through so-called natural draught, also known as natural ventilation, chimney effect or ascending convection current, which means that outside air will find its way in via leaks and/or via various types of air inlet devices, for example so-called spring valves in the walls of the building, often near windows, by which the air is progressively heated and gradually rises through various ducts, for example special exhaust air ducts, usually brought together in a ventilation chimney which discharges above the roof of the house.
The aforementioned incoming air can with advantage be supplied by means of an air inlet device in accordance with Swedish patent specification No. 7803220-8, which ensures an even flow. An inlet devices of this kind can with advantage also be utilized in conjunction with the present invention, where an even flow is of importance.
One disadvantage of the previously disclosed arrangements has been their sensitivity to the effect of the wind, which manifests itself in the fact that the outside air is able, under certain wind conditions which are dependent, amongst other things, upon the wind velocity, the wind temperature and the wind direction, to produce a self-ejecting underpressure and/or to penetrate the ventilation outlets as an overpressure and interfere with the flow of the out-flowing ventilation air. The outside air is also capable, under certain wind conditions, of entering via the aforementioned air inlet devices and of counteracting a gentle inward flow in this way.
DISCLOSURE OF THE INVENTION
The objects of the invention is, therefore, to propose an arrangement of the kind described by way of introduction which will sustain both a gentle inward flow and a gentle outflow, and the sensitivity of which to the effect of the wind is considerably reduced. This object is achieved through the arrangement in accordance with the invention having been given the characteristic features indicated in claim 1.
Further developments of the invention may be appreciated from the sub claims.
The invention is based on observations to the effect that winds out in the open will avoid bushes. The wind will, as a general rule, find alternative routes rather than pass through bushes. If the bushes present an essentially cylindrical form to the direction of the air flow, the latter may change its plane in all directions, by so doing always meeting the same bushy, cylindrical outer form.
Movements of the air within the bushes are noticeably low. Because the wind is free to choose other routes, it will do precisely that. This is, of course, conditional upon the alternative routes being unobstructed and being in no way constricting (compressing, throttling or guiding), which is not normally the case around, for example, ventilation chimneys which project above the roof.
The external structure of the bushes is of critical importance for their function as described here. Generally speaking, therefore, the characteristics of the bushes will be achieved provided that their external structure can be maintained facing in a direction against the wind.
By providing in a gas passageway a wind guard consisting of a wind shielding with a large number of through apertures and with a large no. of elongated, narrow projections protruding into the apertures, a large number of gas passageways of irregular shape are formed thereby simulating the shape of natural bushes. The physical background to this is described below with reference to FIGS. 1 and 2.
DESCRIPTION OF THE FIGURES
The invention will be described in greater detail below with reference to the accompanying drawing, which s
REFERENCES:
patent: 4182487 (1980-01-01), Eriksson
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