DE1905070A1 - Storage heater with a material that stores heat and expands when heated - Google Patents

Description

Storage heater with a heat-storing, when heating up expanding fabric ============ The invention relates to a storage heater with a heat-storing material, which expands considerably when heated and which is in a closed container.

The heat-storing substance can be, for example, a Salt or another substance that liquefies when heated So the heat of fusion is used for heat storage. Especially with one of these The thermal expansion of the fabric is particularly great when it is heated.

In the case of a storage heater of the type described above, it is not very easy to control the thermal expansion of the heat-storing material. One could think about using an open container in which the fabric can expand unhindered. However, it is better to close the container close because the heat-storing substances either evaporate or attach decompose or absorb water from the atmosphere. About the thermal expansion absorb the forces of the heat-storing substance in the closed container, So far, one has resorted to containers with a large wall thickness. However, this method is expensive and therefore undesirable. However, you cannot just use a thinner container use, as this could burst when the heat-retaining material is heated up, so that a storage heater with such a container is a great source of danger would represent It is the object of the invention, the heat-storing Part of the storage heater specified above, i.e. the container with the heat-storing To make fabric so that the container have a relatively small wall thickness can without the risk of the container bursting when the heat-storing substance is conjured up.

This object is achieved according to the invention in that the interior of the relatively thin-walled, closed container when heated approximately Has atmospheric pressure and negative pressure in the cold state.

Such a container is relieved of forces when it is heated. In the state in which the heat-storing material is hot and possibly also is fluid, in welcXlem.

so it could be dangerous if the container cannot burst, because it is under almost the same pressure inside and outside. Only in the cold and non-hazardous state if the heat-storing substance reduces its volume has, the container must withstand the forces acting on it from the outside and which arise from the fact that the atmospheric pressure is now greater than the pressure in the interior of the container. This pressure acting from the outside can, however, come from a thin-walled containers can be collected much more easily than one that acts from the inside Pressure The invention thus achieves two advantages, namely on the one hand, that the container wall can be relatively thin-walled and, on the other hand, that the dangers that can occur if the container breaks are low.

As already mentioned above, the heat-storing stiffener can preferably be used a substance can be used that is liquid in the thickened state and in the cold state is solid, fit heat of fusion thus used for heat storage will. Such a substance is, for example, sodium hydroxide.

The closed container can expediently the usual cuboid shape of the storage heater be matched, so even cuboid shape have, wherein the edges and corners can be rounded.

Appropriately, in addition to the inventive concept, the following can be used Method used to fill the storage heater: The heat-storing Fabric is heated before filling, taking care that the cvtl. Water contained in the fabric escapes. This is because this is special in the container undesirable because it is when the heat-storing material is heated by the liquid State changes into the gaseous state, i.e. it is transformed into steam. It occurs an undesirable increase in volume of about 1: 500.

This can lead to very large pressure differences iii the interior of the closed Guide the container between the heated and the cold state. Furthermore - and this is at least as important - the salt NaOH is no longer aggressive when it is dehydrated.

After the heat-storing material has been heated up, it becomes hot filled into the container and this is closed without any prior notice Cooling of the heat-storing substance is allowed.

Claims (6)

P a a t e n t a n s p r ii c Storage heater with a heat-storing substance, which expands considerably when heated and which is in a closed container, in that the container is relatively thin-walled and its interior space in the heated state approximately atmospheric pressure and in the cold state Has negative pressure. 2. Storage heater according to claim 1, characterized in that there are g e k e n z e i c 11 11 e t that the substance is liquid when heated and solid when cold is. Spreader heater according to claim 1 or 2, characterized in that it is ek e n n z e I do not believe that the substance is a mixture of salts with a predominant proportion of sodium hydroxide. Storage heater according to at least one of Claims 1 to 3, characterized It is indicated that the container has a cuboid shape and preferably Has rounded edges and corners. 5. Expiry rule for filling the storage heater container at least one of the preceding claims, characterized in that it is e k c n ii z e i c h n e t that the substance is approximately the same as the temperature when the container is filled and closed having the heated state. 6. The method according to claim 5, characterized in that g ek e n n z e i c h -n e t that the substance is anhydrous, or at least at least, when the container is filled and closed is arid.