Apparatus for rapid heat transfer and efficient heat storage

Details Apparatus for rapid heat transfer and efficient heat storage Apparatus for rapid heat transfer and efficient heat storage

1980-06-09

1982-06-01

Davis, Albert W.

Heat exchange

Regenerator

Heat collector

16510411, 16510418, 237 56, 219325, 219365, F24D 1100, F28D 1700

Patent

active

043322905

ABSTRACT:
Heating of intermittent users, such as domestic appliances, may require a rapid transfer of heat during an operating period. But hot reservoirs based on transitions between liquid and crystalline phases are least effective during rapid discharge since the crystalline latent heat storing material forming on encapsulating heat transfer surfaces increases thermal impedence. Various means for shortening thermal paths through the crystalline material, such as penetrating conductors, undesirably decrease thermal energy density.
In order to provide both rapid heat transfer capability and a large thermal energy density, the invention uses prolonged idle periods between the operating periods for passive recharging within a hot reservoir of a first latent heat storing material by a second latent heat storing material which has a higher melting point so that the first latent heat storing material melts while the second crystallizes as the hot reservoir approaches a uniform equilibrium temperature. The first latent heat storing material is encapsulated in assemblies having short thermal paths for rapid heat transfer and has sufficient thermal capacity for one of the operating periods. The second latent heat storing material is encapsulated in assemblies having a large thermal energy density and has a thermal capacity which is sufficient to recharge the first for a plurality of the idle periods. Accordingly, the hot reservoir includes a first latent heat storing material assembly for rapid discharge and a second latent heat storing material for a large energy density and passive recharging of the first latent heat storing material.

REFERENCES:
patent: 3780356 (1973-12-01), Laing
patent: 4170261 (1979-10-01), Laing et al.
patent: 4219076 (1980-08-01), Robinson, Jr.

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