Refrigeration system with heat exchanger employing eutectic

Claim 1

An extended cooling period, vapor-compression cooling system incorporating a condenser for dissipating heat energy to an outside area; a compressor operative on a refrigerant fluid; an evaporator for absorbing heat energy from an interior area to be cooled, including a forced air circulation means; and a refrigerant fluid adapted to be circulated within said system wherein: said evaporator consists of refrigerant fluid containing tubing adapted and disposed with respect air circulation produced by said forced air circulation means to absorb heat energy from said interior area to be cooled, said tubing has a plurality of sections with each section having at least two tubing portions, with each tubing portion disposed in spaced relation with respect other portions; wherein at least one sealed container is intrinsically disposed in direct contact with each of said tubing portions along its length and disposed, with respect air circulation produced by said forced air circulation means, to absorb heat energy from said interior area to be cooled; wherein each of said sealed containers contains an eutectic material having a fusion temperature characteristic greater than the normal operating temperature of said refrigerant fluid when circulating in said evaporator and less than the ambient temperature to be maintained in said interior area and a heat of fusion characteristic above 40 BTU, said eutectic material is a composition material selected from the group of composition materials consisting of: sodium chloride - sodium sulphate decahydrate, having a chemical symbol NaCl.Na2SO4.10H2O; sodium chloride - ammonium chloride - sodium sulphate hydrate, having a chemical symbol NaCl.NH4Cl.2Na2SO4.20H2O; sodium manganate decahydrate, having a chemical symbol Na2MnO4.10H2O; sodium chromate decahydrate, having a chemical symbol Na2CRO4.10H2O; and nickel oleate, having a chemical symbol Ni(C18H33O2)2.