FI74345B - TAELJSTENSACCUMULATOR. - Google Patents

Description

74345

VU0LUKIVTV4RAAJA

The invention relates to a soapstone accumulator comprising a bulk pulp for heat recovery, storage and delivery, which pulp is formed by a plurality of groups of elements arranged in parallel and on top of each other, in which spaces are formed for thermal resistances and spaces are formed in the pulp for heat dissipating air flow.

The disadvantage of heat storage has been the large space requirements of the used water reservoirs, the large insulation area and the 10 large heat losses. A large water volume also results in a large expansion volume. The space cost required by the accumulator's investment, together with the costs of the pressure jacket, insulation and expansion system, have become an obstacle to the wider utilization of low-cost electricity at night. 15 Water resources have not been able to be used effectively with other migrating masses. The heat storage capacities of masonry and soapstone fireplaces have been idle for most of the time, and cheap night electricity has generally not been able to be utilized in them. It is previously known to manufacture 20 heat accumulators, in the elements of which vents are placed and air is circulated through the elements. DE-A-2021462 discloses a heat accumulator comprising elements made of a ceramic material. CII-pat secretion 466905 discloses an element of a heat accumulator which is specially shaped to improve airflow. The heat accumulators presented in these publications are made of expensive material and are specially designed, making the equipment expensive to obtain. In addition, it is difficult to replace broken elements. The problem in using soapstone as a heat storage material has been the transfer of heat into the pulp and the further transfer of heat to its intended use. Previously used soapstone structures have resulted in poor heat transfer and rupture of aggregate. Due to the structure and 35 heat transfer methods, the carbonate of the rock has decomposed, leaving it as carbon dioxide. In this case, the thermal conductivity is decisively reduced and the specific lamp per unit volume is reduced. Traditional soap stone uses have often resulted in the burning of the stone, and the stones have lost their ability to conduct heat and charge, as well as broken.

The object of the invention is to provide a soapstone reserve and by means of which the drawbacks associated with existing heat accumulators are eliminated. It is a further object of the invention to provide a soapstone reservoir which is simple in construction and inexpensive to manufacture. It is a further object of the invention to provide a soapstone accumulator which can be used as a accumulating heat source for several different purposes. The object of the invention is achieved by a soapstone bed which is characterized by what is stated in the pressure claims.

According to the invention, the element groups of the soapstone reservoir are formed of one size of soapstone elements arranged one on top of the other, so that a space for heat resistors is arranged in the middle of the soapstone elements and placed in the space centrally. In addition, a space is provided between the groups of elements arranged in parallel for the background of the air stream. As an easy-to-process raw material, soapstone is preferred. When arranged according to claim 1, it maintains its high specific calorific value (0.98 kJ / kgK). The functionality of the invention is based on a structure assembled from one-size-fits-all rock elements, in which inevitable temperature loads in heat storage do not cause chemical or permanent physical changes in the mineral structure. According to the invention, the soapstone accumulator preferably acts as a accumulating heat source in air heating when introducing heated air into a space, a member to be heated or a mantle of fire. In a fireplace constructed in this way, cheap night electricity is utilized by means of a flux accumulator and by means of the charging capacity of the surrounding fireplace structures. According to the invention, the multiple use of the fireplace increases and it forms a modern basic heat source for a detached house. In addition, storage night electric heating is ideal for industry or similar plants where electricity consumption is high during the day and where electrical capacity is not used at night.

The device according to the invention very well meets the technical and economic requirements for heating industrial and similar premises. The advantage provided by the invention for the production and distribution of electricity is significant as a equalizer of daily electricity consumption.

10

The invention will now be described in more detail with reference to the accompanying drawings, in which Fig. 1 shows the mineral structure of soapstone, and Fig. 2 shows the displacements when the temperature gradient 15 is perpendicular to the soapstone slabs. a stone element of a soapstone accumulator, Fig. 5 shows the structure of a soapstone accumulator 20 according to the invention seen obliquely from the front, Fig. 6 shows the use of a soapstone accumulator in fireplaces, and Fig. 7 shows a diagram of a circulating air heating device with a soapstone accumulator.

25

Figure 1 shows the mineral structure of soapstone, which is invariably inhomogeneous. The minerals talc Mg ^ Si ^ O ^ Q (OH2) 40 .. .50 vol.%, Magnesite MgCO ^ 40 ... 50 vol. Vol. And penninite Mg ^ Al ^ SigO ^ COIOg 5 ... 8 30 vol. and lens layers. The size and shape of the strata are random, but the strata are always parallel. In soapstone, the direction of the layers is called the lute direction. The modulus of elasticity, thermal conductivity and thermal conductivity of minerals are different.

4,74345

Figure 2 shows the displacements Δ1 caused by the thermal expansion of the inelastic soapstone when the heat flux Φ moves in the direction s, with the temperature difference t -t perpendicularly through the slats. In a real soapstone with strength, at the interfaces of the infinitely thin mineral layers, there are transitions which easily lead to slips between the layers.

In this case, a strong decrease in thermal conductivity and an increase in temperature t take place at the interface, which in turn leads to chemical and physical changes as well as breakage in the heat-receiving surface layers.

Fig. 3 shows the displacement of the heat flux Φ in the direction s, by the temperature difference t -tn along the soapstone mineral lust and. Here, too, slippage may occur at the interfaces of the mineral layers 15. Because heat is transferred along the slats, the slides do not affect the thermal conductivity in the direction s. In this case, no harmful temperature rise can occur.

Figure 4 shows a stone-20 element KE of a soapstone accumulator according to the invention, in which the disadvantages shown are minimized with respect to the temperatures and thermal stresses present in the accumulator. The proportions in this application are s = y, l = 4s.

Figure 5 shows the structure of a soapstone accumulator 25 assembled from stone elements. The accumulator is assembled from the elements KE shown in Fig. 4 so that the heat flow direction s is the same as the chip direction. There may be several groups of elements ER formed in parallel and on top of each other by the resistance space V and the surrounding stone elements KE. The accumulator is heated by electrical resistors set in resistor-30 spaces V. The heat is dissipated by the air flow through the convection space K between the resistance space V and the parallel element groups ER.

Figure 6 shows a fireplace in which a soapstone-35 accumulator is placed. The accumulator VV utilizes the heat storage capacity and the ability to act as a heat-distributing element in the room in the same fireplace. At the same time, the limb acts as a preheater, whereby the oven U is in a frying condition with a small amount of wood in a short time. The heat is transferred from the accumulator VV through the insulation jacket E with a power Φ ^, which provides the basic heat to the fireplace. The temperature control in the fireplace 5 takes place as heat transfer with the convection flow. The convection flow takes place on its own or mechanically. To promote self-powered convection, the accumulator VV is ascending in the flow direction. To control the fireplace and further the room temperature, the accumulator has a damper or fan-10 Iin P, which is controlled by a controller TC according to the fireplace temperature TE1 and room temperature TE2. The heat is transferred to the room by means of the air flow heated by the secondary convection space TK in the fireplace structure with power and natural radiation and convection from the fireplace mantle at power 15 Φςκ * The soapstone accumulator also heats the domestic hot water tank LV and provides the necessary heat.

Fig. 7 shows a schematic view of a circulating heating device occupying an industrial or similar space 20. The air to be heated comes from the room space to the distribution space JT, from which part of the flow is taken by means of a fan F to the soapstone accumulator VV, from where it is directed to the mixing space ST to heat the main circulation air. The main flow, or circulating air, heats 25 room spaces. The main flow flows from the distribution state JT through the damper SP to the mixing state ST. The damper acts as a balancing member for the flow and pressure ratios. Ventilation with heat recovery LTO is connected in parallel with the heating circuit of the soapstone accumulator VV. The air temperature in the room t.ule-30 van is controlled by converting the speed of the fan F by means of a voltage transformer UM controlled by the temperature automation TC, TE1, TE2.

Claims (2)

74345 PATENT CLAIMS / t w> t ^ A soapstone accumulator comprising a storage mass for heat recovery, storage and delivery, the mass being formed by a plurality of groups of elements (ER) arranged in parallel and on top of each other, in which spaces (V) for heat resistors are formed and spaces (V, K) are formed in the mass. ) for a heat dissipating air flow, characterized in that the groups of elements are formed in one size from soapstone elements (KE) arranged one on top of the other and next to each other so that a space (V) for heat resistors is arranged in the middle of the soapstone elements 10 and so that the soapstone elements the direction (s) is always parallel to the heat transfer and that a space (K) for air-15 flow is arranged between the groups of elements arranged in parallel. A soapstone accumulator according to claim 1, characterized in that it acts as a accumulating heat source in air heating when conducting heated air 20 to a space, a heated element or a fireplace mantle. t