CN86104758A

CN86104758A - The preparation of phase transition energy storage composite with controlled heat storage period

Info

Publication number: CN86104758A
Application number: CN198686104758A
Authority: CN
Inventors: 胡启柱
Original assignee: Huazhong Normal University
Current assignee: Huazhong Normal University
Priority date: 1986-07-14
Filing date: 1986-07-14
Publication date: 1988-01-27

Abstract

Phase transition energy storage composite with controlled heat storage period provided by the invention is a kind of novel phase change heat-storing material.Its preparation method is at sodium acetate trihydrate (NaCH ₃COO3H ₂O) add sodium carboxymethylcellulose (CMCNa) in and make the nucleation inhibitor, after the prepared system melted by heat, can at room temperature place the long period (140 days) and non-crystallizable, when needing, can add micro-NaCH ₂COO3H ₂O crystal grain makes its crystallization that the heat of transformation is provided.The raw material of this phase change heat storage system is inexpensive, be easy to get, and can use repeatedly, need not be incubated, and has a wide range of applications.

Description

The present invention is at sodium acetate trihydrate (NaCH ₃COO3H ₂O) add reagent for restraining nucleation in, prepare novel phase transition energy storage composite with controlled heat storage period.

Sodium acetate trihydrate (NaCH ₃COO3H ₂O), the bigger latent heat of fusion (264J/g, 328J/cm are arranged 58.40 ℃ of fusions ³).After in this hydrated salt, adding reagent for restraining nucleation, when this hydrated salt cools off after melted by heat, because reagent for restraining nucleation is to sodium acetate trihydrate (NaCH ₃COO3H ₂O) generation of nucleus has inhibitory action, and under the temperature that is lower than this hydrated salt fusing point, its supersaturated solution can long preservation and be non-crystallizable.In other words can be with the latent heat of phase change long term storage of the method with this hydrated salt, when needing heat supply, the crystallization and supply heat in supersaturated solution immediately of the crystal grain (playing the initiation crystallization) that in its supersaturated solution, adds a spot of sodium acetate trihydrate, this hydrated salt.

Generally speaking, with sodium acetate trihydrate (NaCH ₃COO3H ₂O) storing when hot, is to add nucleator, as sodium pyrophosphate decahydrate (Na ₄p ₂O ₇10H ₂O), preparation phase changing energy storage constituent.This phase changing energy storage system is the same with its ground phase change heat-storing material, when being cooled to below the fusing point, is about to the crystallization heat release, and therefore the limited time that stores heat can only short-term be store 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 colloidal substance.According to reports, Britain Altec Adeco company has developed with " xanthans " (Xanthan gum) as sodium acetate trihydrate (NaCH ₃COO 3H ₂O) reagent for restraining nucleation, but this " xanthans " costs an arm and a leg, the source shortage.

We have studied and have used sodium carboxymethylcellulose (CMCNa) or marine alga sodium (Sodiumalginate) as sodium acetate trihydrate (NaCH ₃COO3H ₂O) nucleation willow preparation, the result shows that the effect of sodium carboxymethylcellulose (CMCNa) is better.Sodium acetate trihydrate (the NaCH that contains a certain amount of sodium carboxymethylcellulose (CMCNa) ₃COO3H ₂O) fusing back cooling can make system be in liquid state (hypersaturated state) for a long time and non-crystallizable, thereby with the latent heat of phase change long term storage.A series of samples of preparation all can be placed 140 days (end when writing this paper to late June, still observing storage period) under 5-30 ℃ temperature after melting, still be in a liquid state.When needing heat supply, add minute quantity crystal sodium acetate trihydrate (NaCH ₃COO3H ₂O) or its constituent make initator, then should promptly have three water to contain sodium acetate (NaCH in the solution ₃COO3H ₂O) crystal is separated out, and heat is provided.

Embodiment, Jiang Sanshui contain sodium acetate (NaCH ₃COO3H ₂O) 37.2 grams, (CMCNa) constituent of 0.4 gram places plastic bottle, heats in 70-80 ℃ hot water, stirs a little after the fusing fully, adds water 1ml again.This system places the environment about 5 ℃ can be gel.Can under 5-15 ℃ of temperature, not need insulation to place and still be in a liquid state in 65 days, if add the sodium acetate trihydrate (NaCH of 20～20mg ₃COO3H ₂Sodium acetate trihydrate (NaCH takes place in O) crystal grain immediately ₃COO3H ₂O) crystallization, the temperature of system can rise to 56 ℃ by 15 ℃ (room temperatures).With the refuse in 70-80 ℃ of hot water of completely crued this constituent, place and still be in a liquid state in 60 days, and not crystallization.

This at sodium acetate trihydrate (NaCH₃COO·3H ₂O) add sodium carboxymethylcellulose (CMCNa) in but make the nucleation inhibitor and the phase transition energy storage composite with controlled heat storage period Reusability for preparing, and the storage heat is unattenuated, used thermal source can be solar thermal energy, waste heat, used heat, underground heat, the heat energy of the various ways such as electric heating. Can be long term storage and do not need heat-preserving equipment with the original only solid-liquid phase-changeable thermal change of short with the method. It has the storage heat density big than the long-term storage heat of sensible heat, does not need The obvious advantage of the unattenuated grade of heat is in use store in insulation.

Phase transition energy storage composite with controlled heat storage period provided by the invention has been widely used, and it is put in the container, can carry, and heat is provided at any time.Can be used for family heating, body-care (heat pad), sea rescue, open-air, underwater operation, and aspect such as weaponry.Prepare if any the people, use it for the infra-red homing rocket means increasing its disguise, or make the bomb detonator of durability, or the antifreezing agent of system vehicle, aircraft power plant, or as the heat-storing material of large-scale heat reservoir, store nuclear power station used heat etc.

Claims

1, the invention provides a class and store controllable phase transformation constituent of hot phase, it is characterized in that receiving (NaCH at three hydration acetate ₃COO3H ₂O) add sodium carboxymethylcellulose (CMCNa) in as reagent for restraining nucleation, be prepared into New-type phase change heat-storing material.

2, according to described this constituent that it is characterized in that of claim 1 by sodium acetate trihydrate (NaCM ₃COO3H ₂O), water (H ₂O) and sodium carboxymethylcellulose (CMCNa) formulated.

3, described according to claim 1 and 2, it is characterized in that said composition is by sodium acetate trihydrate (NaCH ₃COO3H ₂O) 100 parts (weight), water 3-4 part (weight), it is formulated to add sodium carboxymethylcellulose (CMCNa).

4, described according to claim 1 and 2, it is characterized in that this constituent can be at sodium acetate trihydrate (NaCH ₃COOH ₂O) add the sodium carboxymethylcellulose (CMCNaa) of the 0.5-2.0% of its amount in, it is formulated to add water again.

5, described according to claim 1 and 2, it is characterized in that this constituent can be by sodium acetate trihydrate (NaCH ₃COO3H ₂O) 100 parts (weight), sodium carboxymethylcellulose (CMCNa) 0.5-2 part (weight), water (H ₂O) 3-4 part is formulated.