FR2477681A1 - Heat economiser for open fireplace - has integral hearth with reflective backplate to aid radiant heat output - Google Patents

Abstract

The economiser is a reflector in the form of an integral hearth (1) and fireback (2,3,4) manufactured from thick steel plate. The principle can be adapted for a fireplace with a fresh air inlet (7) with a regulator for the airflow (8). In houses with other main forms of heating such as electricity, it is desirable to close off the chimney when the fire is out. A damper (10) is installed for this purpose. The system may also be installed to serve as an indirect air heater, with the fresh air passing over the back of the radiant plate before discharging into the room.

Description

DESCRIPTION RADIANT. ANERGY SAVING FOR WOOD FIREPLACE
OPEN FIRE
The subject of the present invention is an energy-saving appliance for heating, which, without requiring any special installation, simply slipped into a liter of an open hearth wood fireplace, the draft of which is normal, makes it possible to considerably improve the usable thermal efficiency.

 The setting in mode is fast, the fire in liter does not differ from the aspect of an ordinary fire.

 The device is unbreakable, hard-wearing and maintenance-free.

 Whereas in an ordinary chimney we use only a very small part of the heat, that which is transmitted by direct radiation, our device collects the greatest part of the rays which formerly were not used and directs them into the room to heat.

Our device consists of a single treated steel plate, very thick, 8 to 10 mm, folded in several places and forming the sole (1), the hearth plate (2), the radiating plate (3) and the reflector. (4). See drawing 1, plate I / 2.

The dimensions and the folding angles 5 and 6 are variable, depending on the dimensions of the opening of the hearth and calculated so that the previously unused reflected rays can penetrate into the room to be heated.

 In an open wood fireplace, the highest temperatures are located under the brazier and in the vertical part closest to the fire.

 The fact that our device consists of a single thick steel plate and that there is no breakage, allows to distribute by conductivity this excess heat over a larger surface, which allows the radiant effect. More heat is captured on a plate placed obliquely on an open hearth and better recovery is obtained when the heat of the flames and gases licking this wall is reflected and usefully directed into the room to be heated, before being cooled by the excess air.

 The temperature of the radiating plate improves combustion and decreases the fumivosity.

 The radiated heat of short wavelength 8 to 4 is perceived by the occupants much faster than the ambient temperature of the room which gradually heats up, which makes it possible to appreciate this heating without requiring continuous operation.

 INDEPENDENT OF D'ABILLAGB DECORATIVE OF FIREPLACES.

Claims (4)

R E V E N D I C A T I O N S WITH OPEN FIRE. ATRE A RAYONNENENT, ENERGY SAVING FOR CHIMNEYS IN BOI5 Four models are provided and an air intake fan.  1 - For existing chimneys with normal draft Fig. 1, plate 1/2. Device simply slipped into liter without requiring installation, saves around 60% for equivalent heating. 2 - For an existing chimney but with an outside air intake Fig. 2, plate 1/2.  The air necessary for combustion opens out under the hearth 1, heats up slightly and ends up in a blower drawer 8, placed at the front, which allows air adjustment or closing If the fire is not used.  For the two previous devices Fig. 1 and Fig. 2 an incombustible heat insulating jacket 9 can be used on the rear side to obtain maximum performance. 3 - In houses with integrated electric heating where it is nevertheless desirable to be able to use a wood fire in a useful way, it is essential to be able to isolate the chimney, when the fire is not used, by a closing flap placed in the drain. The apparatus Fig. 3, board I / 2, includes the external air supply device adjustable by blower drawer, the heat-insulating jacket and the chimney closure flap 10 adjustable by a sector & ratchet 16, all assembled and adjusted by a solid frame which facilitates installation and connection to the flue. The closing flap 10 serves as an additional reflector when it is wide open.  4 - The profile of our other radiation, which allows to capture the maximum heat from an open wood fire, can also be equipped for mixed heating when the chimney is to be built. Fig. 4, plate 1/2. In this model, the heat insulating jacket is removed. The air supply device remains unchanged. The rear face is alore fitted to heat by convection the air taken from the room by grids 11 located on either side of the base of the chimney and restored after reheating by two heat vents of 250/150 mm , arranged on both sides of the hood and connected by flexible pipes 150 mm in diameter. The whole is assembled with a solid frame which ensures the fixing and adjustment of the chimney adjustment flap and allows quick connection to the flue.  In this model, the radiation is well reduced, the heat effect is slower, but given the temperatures obtained the efficiency is excellent. All these devices are independent of the decorative covering of the fireplaces.  In windy regions or in the event that mechanical ventilation lowers the room, the low height of individual houses may require the help of a small fan to restore positive pressure and allow the chimney draft and proper functioning ventilation of the kitchen. This small centrifugal fan 13 of low power is intended for its installation in the air intake.  Combined with a slight heating of air 15, it avoids cooling the air in the room after the combustion of the wood before closing the chimney and the air intake.