Testing heat storage capability of some loose granular materials

✍ Scribed by A.K. Shrotriya; S.K. Jain; L.S. Verma; R. Singh; D.R. Chaudhary

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 364 KB
• Volume: 12
• Category: Article
• ISSN: 0890-4332
• DOI: 10.1016/0890-4332(92)90044-i

✦ Synopsis

The role of the heat storage coefficient of some loose granular materials in determining the amount of heat retained during the transient state has been investigated. An experimental study has been done in the laboratory for testing the heat storage capability of some loose granular materials such as marble powder, dune sand, ash, high refractory cement, wheat husk and sawdust. For this purpose a wooden box of sides 30.5 × 51 × 53 cm was fabricated. In the middle of this a rectangular plastic box (heat store) of sides 28 × 23 x 6.5 cm, surrounded by loose granular materials, was placed. The upper portion of the wooden box was covered by thermal insulation. Two containers, similar to the one placed in the materials, were lying above the wooden box at a height. Using a battery of electric light bulbs the temperature of water in these containers was raised to about 70°C. The water from one of the containers was transferred to the container lying in the material. A study of heat loss from this container (heat store) and from the other one which was lying in the open, was conducted at time intervals. In the heat store a thermocouple was also placed along the z-axis. It was found that the fall in temperature of the materials surrounding the heat store is determined by the heat storage coefficients of the surrounding materials, which were measured by the plane heat source method. It was observed that for the low-values of heat storage coefficient surrounding materials, the heat dissipation from the heat store was low, whereas for high valued heat storage coefficient material surrounding the store, heat loss increased.