CN86104764A - Phase transition heat storage system of Na 2 S 2 O 35 H 2 O - Google Patents

Abstract

Controllable phase changing energy storage system of hot phase of storage provided by the invention is a kind of novel phase change heat-storing material.Its preparation method is at hypo (Na ₂S ₂O ₃5H ₂O) add sodium alginate (Sodium alginate) in and make the nucleation inhibitor, after the constituent melted by heat of preparing, can under 5-32 ℃ temperature, place 140 days (up to the time of handwritten copy specification, store hot phase observation and still proceeding).When needing heat, can add initator and make its crystallization heat release.The raw material valency of this storage body system produces and is easy to get, can Reusability and heat is unattenuated, and storing does not need heat-preserving equipment when hot, has been widely used.

Description

The present invention is at five hydration hypo (Na ₂S ₂O ₃5H ₂O) add reagent for restraining nucleation in, prepare novel phase transition energy storage composite with controlled heat storage period.

Na ₂S ₂O ₈5H ₂O is 48.16 ° of meltings, and melting heat is 196.61J/g(46.99cal/g) or 334J/cm ³(79.79cal/g).Cool off after being added with this hydrated salt melted by heat of reagent for restraining nucleation, because reagent for restraining nucleation is to Na ₂S ₂O ₃5H ₂The generation of O nucleus has inhibitory action, can become supersaturated solution under the temperature that is significantly less than this salt fusing point and non-crystallizable, thereby with the latent heat of fusion long term storage of this hydrated salt.When needing heat, initator be can add, this hydrated salt crystallization and release heat in supersaturated solution made.

Generally, storing when hot with hydrated salt, is to add nucleator to make the phase change heat storage system in this salt.When being cooled to the temperature that is lower than its fusing point slightly after this system fusing, just with the crystallization release heat.Therefore it is short that it stores the hot time, can only short-term storage heat.

Colloidal substance is as a class reagent for restraining nucleation, and its cardinal principle is to make this nucleus lose into nuclear activity at heterogeneous nucleating surface absorption colloid.We study with sodium alginate (Sodium Alginate) and make Na ₂S ₂O ₃5H ₂The reagent for restraining nucleation of O.The Na that contains a certain amount of sodium alginate ₂S ₂O ₃5H ₂Cooling after the O fusing obtains thick liquid or gel, can place 140 days (observed and recorded in by the end of June, 1986 is store hot phase test and proceeded) under 5-32 ℃ of temperature.When needing heat, add minute quantity Na ₂S ₂O ₃5H ₂The O crystal makes supersaturated solution crystallization heat release.

Embodiment is with Na ₂S ₂O ₃5H ₂O26.0 gram and sodium alginate 0.3 gram and Na ₂CO ₃0.1 gram (preventing that hypo from decomposing) places plastic bottle, heats in 60-70 ℃ of water-bath, makes Na ₂S ₂O ₃5H ₂O melts fully, stirs a little during heating.Add water 1ml then, be cooled to～5 ℃.Under 5-15 ℃ of temperature, place 60 days afterwards input～20mgNa ₂S ₂O ₃5H ₂O causes the crystallization heat release, and system temperature is raised to rapidly 46 ℃ by room temperature (15 ℃).Na with crystallization ₂S ₂O ₃5H ₂The O remelting, it still is liquid placing after 60 days.

Add sodium alginate in this hypo and make the nucleation inhibitor, but store controllable phase change heat storage constituent Reusability of hot phase, and heat is unattenuated, does not need heat-preserving equipment during storage. Used thermal source can be the heat energy of the forms such as solar energy, waste heat, used heat, underground heat, electric heating. Store for a long time ratio of specific heat with sensible heat, it has the storage heat density big, need not be incubated, and in use stores the obvious advantage of the unattenuated grade of heat.

This constituent is packed in the container, can carry, heat is provided at any time.It is of many uses, can be that life, medical treatment, open-air effect, underwater operation, soldier are on duty, sea rescue provides heat.The antifreezing agent that also can be used as vehicle, aircraft, the heat-storing material of heat reservoir is stored nuclear power station used heat etc.

Claims (5)

1, the invention provides a kind of controllable phase change heat storage system of hot phase of storage, it is characterized in that at hypo (Na ₂S ₂O ₃5H ₂O) add sodium alginate (Sodium alginate) in and make the nucleation inhibitor, make New-type phase change heat-storing material.

2, described by claim 1, it is characterized in that this system is by hypo (Na ₂S ₂O ₃5H ₂O), water (H ₂O), sodium carbonate (Na ₂CO ₃) and sodium alginate (sodium alginate) formulated.

3, described by claim 1 and 2, it is characterized in that this system can be by hypo (Na ₂S ₂O ₃5H ₂O) 100 parts of weights, heavy, the sodium carbonate (Na of water 1-4 part ₂CO ₃) 0.5 part of weight, it is formulated to add sodium alginate (sodium alginate).

4, according to claim 1 and 2, it is characterized in that can be at five hydration sodium sulphate (Na in this system ₂S ₂O ₃5H ₂O) add the 0.5-2.0%(weight of its amount in) sodium alginate (sodium alginate), add water again and sodium carbonate formulated.

5, described by claim 1 and 2, it is characterized in that this system can be by hypo (Na ₂S ₂O ₃5H ₂O) 100 parts of weights, sodium alginate (sodium alginate) 0.5-2.0 part is heavy, 0.5 part of weight of sodium carbonate, water 1-4 part reprovision system forms.