# US 4,400,286 A · Heat storage materials suitable in particular for indoor air cooling

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,400,286 A
- Document ID: US4400286A
- Status: Granted
- Kind: A
- Application number: 06/225,417
- Filed: 1981-01-15
- Granted: 1983-08-23
- Earliest claimed: 1980-01-19
- Inventors: Peter Schaper; Oliver Laing
- Web page: https://patentgrep.com/patent/US4400286A

## CPC

- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The use of Na.sub.2 CrO.sub.4.10 H.sub.2 O as a heat storage medium is disclosed. Various amounts of Na.sub.2 SO.sub.4.10 H.sub.2 O may be included to provide a melting temperature between 19.degree. C. and 31.9.degree. C. A lower melting temperature can be obtained by adding CO(NH.sub.2).sub.2. Paper sludge or waste products from the processing of sugar cane or peat can be added to increase viscosity. Auxiliary liquids such as trichlorethylene and tetrachlorethylene or silicone oils can be added to maintain pumpability of the compositions.

## Claims

### Claim 1

Storage material for storing latent heat, characterized in that said material contains a mixture of Na.sub.2 CrO.sub.4, at least 10 Mol H.sub.2 O for every Mol Na.sub.2 CrO.sub.4, an amount of Na.sub.2 SO.sub.4.10H.sub.2 O sufficient to raise the melting temperature of the mixture to a desired level between 19.degree. C. and 31.9.degree. C., and 6.7-33.6% by weight of a paper sludge.