SK9733Y1 - A method of increasing the heat-accumulation properties of outdoor ovens and thermally insulated doors - Google Patents

Abstract

The method of increasing the heat-accumulating properties of outdoor ovens is a system solution for increasing the heat-accumulating properties of outdoor wood-fired ovens made of fireclay, heated concrete or ceramic material. The basis of the solution is a self-supporting thermally insulated door equipped with heat-resistant bioboard, which is plated in the construction of a thermally insulating door and on which a wooden handle with teflon insulation and a thermometer are mounted. The thermally insulated door is an element that is installed in the oven after it has been heated to the required baking temperature, namely in the chimney chamber of the oven, immediately in front of the chimney opening in the oven, in a pre-made groove in the hot concrete element of the chimney chamber of the oven, thereby displacing the working chamber of the oven from the chimney chamber to seal the heat in the working chamber of the furnace. This system solution has an impact on the economic parameters of baking in an oven in ordinary households as well as in business catering establishments, since in order to achieve a higher heat-accumulation efficiency of the oven, it is not necessary to incur higher costs for the production of the oven, which will be reflected primarily in the purchase price of the oven and at the same time will be reduced the cost of wood consumption during baking as a result of maintaining the accumulated temperature in the working chamber of the oven for a period of min. 12 hours and due to the possibility of repeated baking for one heating in the oven.

Description

The field of technology

The technical solution relates to increasing the heat-accumulating properties of outdoor ovens for baking using wood, the building elements of which are fireclay, heated concrete or ceramic material.

Current state of the art

Outdoor wood-fired ovens for baking, which are made of fireclay, fired concrete or ceramic material, generally bake using a fire whose heat is stored in the fireclay or fired concrete structure of the oven. This accumulated heat is constantly recharged by the fire burning in the rear part of the oven, which is the working chamber of the oven, i.e. the space for heating and baking. The disadvantage is the constant worry about the fire and the large consumption of wood due to the constant leakage of accumulated heat. Baking itself requires more attention. Ovens with good insulation are already commonly available on the market, in which thermal energy is more efficiently accumulated with the help of fire, while for the purpose of even baking, i.e. creating homogeneous conditions for even baking, it is then generally necessary to remove coals after heat has accumulated in the oven. After removing the coals, the escape of the accumulated heat is partially prevented with the help of the outer door and the closing of the chimney flap, so it is possible to bake in the oven for a certain time even without fire using only the accumulated heat. However, the cumulative efficiency of these higher-quality ovens is generally insufficient to be able to repeatedly bake in the oven more than once for one heating, for the following reasons:

- heat leaks next to the chimney flap,

- heat leaks through the outer door, excess heat leaks in the area of the chimney chamber.

If the storage potential of the ovens currently available on the market were to be increased, the thickness of the heat-accumulating elements - fireclay, hot concrete, needed for the construction of the oven - would have to be increased in the first place. However, increasing the thickness of the heat-accumulating elements will require greater costs for optimal operation of the oven and the realization of baking, especially the purchase price of the oven. The consumption of wood and the time required to heat the oven to the required baking temperature will also increase automatically. However, increasing the thickness of the heat storage elements of the furnace still does not solve the shortcomings associated with heat leakage as described. The presented technical solution ensures higher efficiency of the heat-accumulating properties of the furnace without the need to increase the thickness of the heat-accumulating building elements during the construction of the furnace - fireclay, refractory concrete, and at the same time prevents the mentioned unnecessary heat leakage from the furnace, thus allowing to bake in the furnace repeatedly for one heating for several times hours.

The essence of the technical solution

The basis of the technical solution is the addition of another self-supporting thermally insulated door to the chimney chamber of the furnace, immediately in front of the chimney opening, into the pre-formed groove in the hot concrete building element of the chimney chamber. The door is always adjusted so that its shape rests on a pre-formed groove in the hot-air concrete element of the chimney chamber. After installation, the thermally insulated door will seal the groove with its load-bearing capacity, thereby also sealing the temperature. After their insertion, the working chamber of the furnace will be effectively displaced from the chimney chamber of the furnace, thus there will be no heat leakage past the chimney flap, no heat leakage through the outer door, and no excess heat leakage in the area of the chimney chamber, which will significantly increase the heat-accumulating properties of the furnace. The mentioned door is placed in the oven only after it has been heated to the desired temperature, which must be maintained, while it is also recommended to clean the oven from the remains of burnt wood in order to create homogeneous conditions for even baking, but cleaning the oven from the remains of burnt wood is not a condition. After installing the thermally insulated door, the oven continues to work only with accumulated heat, and due to the increase in the heat-accumulating properties of the oven by installing a thermally insulated door, it is possible to bake in the oven repeatedly without the need for additional heating for several hours. The advantage of the presented technical solution lies primarily in the fact that, as a result of its use, the costs of manufacturing a furnace with a higher heat storage efficiency will not increase, and may even decrease. Logically, there is also a reduction in the consumption of wood for baking, as unnecessary heat leakage will be prevented and it will be possible to bake in the oven more than once per heating, which will also reduce the negative effects of such baking on the environment and improve the health safety of food by eliminating partial smoking of food. In addition to the above, with a high-quality professional installation of the presented technical solution, it will be possible to bake in the oven with the help of steam, which is otherwise not possible.

Overview of images on drawings

Figure 1 shows a longitudinal section of the furnace.

Figure 2 shows a front view of the furnace.

Implementation examples

The presented technical solution was developed, tested and used on a regular outdoor oven for baking using wood, which is made of fireclay, heated concrete or ceramic material and whose individual basic parts usually consist of: concrete support plate 3, four heated concrete blocks 1, 5, 8, 11, refractory concrete floor slabs 17, concrete body 9, concrete decorative portal 14, heat-resistant insulation boards 6, heat-resistant insulation wool (body insulation) 7, industrial foil (i.e. foil foil - vapor barrier) 2, stainless steel chimney (chimney body or chimney opening) 13, the chimney chamber 18 and the front metal door 15 with a wooden handle 16. The insulation in the self-supporting thermally insulated door 19, the addition of which is the essence of the presented technical solution, is equipped with heat-resistant bioboard, which is plated in the construction of the thermally insulated door 19. Since the working temperature in the oven is assumed to be up to approx. 350 degrees Celsius (maximum temperature for baking), a wooden handle 12 with Teflon insulation is installed in the thermally insulated door 19. Thus, manipulation of the thermally insulated door 19 in full operation is also possible with bare hands. The thermally insulated door 19 is equipped with a thermometer 20 to 500 degrees Celsius for the purpose of correct temperature measurement in the working chamber 4. In the first step, the furnace must be heated to the required temperature. Approximately 5-6 kg of dry wood is usually sufficient to heat the oven to a temperature of 350 degrees Celsius, and the oven is heated in approximately 3.5 hours. Subsequently, after heating the oven and removing coals and ash (coals and ash are generally removed for the purpose of creating homogeneous conditions for uniform baking), a self-supporting thermally insulated door 19 with the specified properties is installed in a pre-formed groove 10 in the fired concrete element of the chimney chamber 18 of the oven. Once installed, the thermally insulated door 19 seals the groove 10 itself and at the same time seals the heat, which separates the working chamber 4, in which the baking process takes place, from the chimney chamber 18. By normal control of the baking process, the temperature reached can be maintained in the working chamber 4 of the oven suitable for baking for at least 12 hours, at an average outside temperature of about 10 °C. It is possible to bake several times for one heating without additional heating, as the accumulated heat does not escape excessively.

Industrial applicability

The presented technical solution has a fundamental impact on the economic parameters of baking in an oven in ordinary households, but also in business catering establishments. In order to achieve a higher heat storage efficiency of the oven by installing a thermally insulated door, it is not necessary to incur higher costs for the production of the oven, which is reflected primarily in the purchase price of the oven and at the same time due to maintaining the accumulated temperature in the working chamber of the oven for at least 12 hours and as a result of the possibility of repeated baking per heating will reduce the cost of wood consumption during baking. This solution can be used both in the production of ovens for households and for the catering industry.

List of relationship tags

fig. 1 1 aerated concrete block no. 1 aluminum foil - vapor barrier concrete support plate work chamber - space for heating and baking aerated concrete block no. 2 heat-resistant insulation of the floor heat-resistant insulation of the body refractory concrete block no. 3 concrete body groove in block no. 3 heated concrete block no. 4 wooden handles on the thermally insulated door, chimney body or chimney opening, concrete decorative portal, front metal door with vents, wooden handle of the front metal door, aerated concrete - slabs for the floor, chimney chamber, thermally insulated door

fig. 2 14 concrete decorative portal body chimney body or chimney opening thermally insulated door thermometer wooden handle on the thermally insulated door aerated concrete - slabs for the floor concrete support plate

Claims (2)

CLAIMS FOR PROTECTION 1. A method of increasing the heat-accumulating properties of outdoor ovens, characterized by the fact that after the oven has been heated to the required baking temperature, in the chimney chamber (18) of the oven, in front of the chimney opening 5 (13), they are inserted into the pre-made groove (10) in the hot concrete element of the chimney chamber ( 18) furnace self-supporting heat-insulated door (19), which displaces the working chamber (4) of the furnace from the chimney chamber (18) of the furnace to seal the heat in the working chamber (4) of the furnace. 2. Thermally insulated oven door for carrying out the method according to claim 1, characterized in that the insulation in the thermally insulated door (19) contains a heat-resistant bio-board, which is 10 plated in the construction of the thermally insulated door (19) and on the thermally insulated door (19) a wooden handle (12) with Teflon insulation and a thermometer (20) are fitted.