Temperatures stored heat

The use of thermal insulation dates back to ancient times, when primitive man used animal skins for clothing and built structures for protection from the elements. Primitive insulation included fibrous materials such as animal fur or wool, feathers, straw, or woven goods. Bricks and stone, while not highl y efficient thermal insulation, provided protection from the elements, reduced the loss of heat from fires, and provided large masses that moderate temperature changes and store heat. 

By far the most common way of heat storage is as sensible heat. As Figure 100 shows, heat transferred to the storage medium leads to a temperature increase of the storage medium. The ratio of stored heat to temperature rise is the heat capacity of the storage medium. 

The stored heat as a function of temperature is determined using calorimeters. According to the calorimetric formula... 

Figure 155. Stored heat of a PCM in fixed temperature intervals...

This compound is stable indefinitely if stored at room temperature. Prolonged heating at temperatures of 80° or higher, however, will result in rapid decomposition involving possible hazards.2... 

Chlorite is known in two forms NaC102 and NaC102.3 HzO. The powder is completely stable, if stored in a dry place and at a normal temperature. When heated up to 150 to 200 °C, it decomposes mainly into chlorate and chloride and to a lesser extent into oxygen and chloride. Chlorite is more stable than hypochlorite, but less stable than chlorate. Its reaction with sulphur is spontaneous. It is, therefore, imperative to prevent chlorite from coming into contact with rubber which had been vulcanized with sulphur. 

Resin Preparation Approximately 1 kg of MY720 was heated briefly to 70°C and mixed with 27 parts Eporal per hundred parts (phr) MY720. The temperature was gradually increased to 150°C while stirring to facilitate mixing. The mixture was cooled to room temperature, stored at -20°C, and used as a master batch. 

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