Heat storage medium of moistened Na.sub.2 HPO.sub.4.12H.sub.2 0

Details Heat storage medium of moistened Na.sub.2 HPO.sub.4.12H.sub.2 0 Heat storage medium of moistened Na.sub.2 HPO.sub.4.12H.sub.2 0

1978-11-28

1981-02-24

Pitlick, Harris A.

Compositions

Frost-preventing, ice-thawing, thermostatic, thermophoric,...

126400, C09K 506, F24J 304

Patent

active

042526612

ABSTRACT:
Na.sub.2 HPO.sub.4.12H.sub.2 O is prevented from deteriorating as a heat storage medium after repeated cycles of heat storage and heat withdrawal resulting from precipitation of dehydrated forms of the salt by mixing thoroughly into the dodecahydrate material a small water content up to 5% of the mixture by weight, after which the material is heated above the melting point of the dodecahydrate and then cooled in a gas-tight container. Between 0.1 and 2% by weight of urea, and most preferably about 0.7% by weight thereof, may also be incorporated into the mixture, as by first dissolving the urea into the water to be added, in order to reduce the thermal expansion coefficient of the heat storage medium. Unlike disodium hydrogen phosphate dodecahydrate with stoichiometric hydration, the heat storage medium with the above-mentioned additions fully retains its phase reversibility after many heat cycles and makes available the highly suitable temperature of phase change and large magnitude of latent heat of the material for practical solar heating, heat pump, and air-conditioning systems.

REFERENCES:
patent: 2333862 (1943-11-01), Hill et al.
patent: 2677243 (1954-05-01), Telkes
patent: 2677367 (1954-05-01), Telkes
patent: 2706716 (1955-04-01), Howe et al.
patent: 3951127 (1976-04-01), Watson et al.
patent: 4117882 (1978-10-01), Shurcliff

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