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Inorganic-salt efficient coolant for refrigerated products

A technology of frozen products and inorganic salts, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of phase separation, flammability and explosion, low latent heat of phase change, etc., to improve the stability of phase change cycle, cycle Good stability and high latent heat of phase change

Inactive Publication Date: 2017-04-19
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Inorganic phase change cold storage materials have high latent heat of phase change, but there are disadvantages such as large degree of supercooling, phase separation, and certain corrosion; organic phase change cold storage materials have no supercooling and phase separation phenomena, stable performance and non-corrosiveness. But the latent heat of phase change is low, flammable and explosive, and the cost is high

Method used

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  • Inorganic-salt efficient coolant for refrigerated products

Examples

Experimental program
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Effect test

Embodiment 1

[0015] A kind of inorganic salt phase change material comprises the composition of following weight percent:

[0016]

[0017] The preparation process of the cold storage agent of the present invention is simple and feasible, easy to operate, high in economic value, and good in stability. The phase transition temperature of the cold storage agent measured by DSC (differential scanning calorimetry) is -19.51°C, and the latent heat of phase transition is 273.4KJ / kg

[0018] The cooling curve of this embodiment is as figure 1 As stated, the degree of subcooling is 0.1°C, basically no degree of supercooling

Embodiment 2

[0020] A kind of inorganic salt phase change material comprises the composition of following weight percent:

[0021]

[0022] The preparation process of the cold storage agent of the present invention is simple and feasible, easy to operate, high in economic value, and good in stability. The phase transition temperature of the cold storage agent measured by DSC (differential scanning calorimetry) is -20.02°C, and the latent heat of phase transition is 278.0KJ / kg

[0023] The cooling curve of this embodiment is as figure 2 As stated, the degree of supercooling is 0.7°C, which is very small.

Embodiment 3

[0025] A kind of inorganic salt phase change material comprises the composition of following weight percent:

[0026]

[0027] The preparation process of the cold storage agent of the present invention is simple and feasible, easy to operate, high in economic value, and good in stability. The phase transition temperature of the cold storage agent measured by DSC (differential scanning calorimetry) is -21.78°C, and the latent heat of phase transition is 282.3KJ / kg

[0028] The cooling curve of this embodiment is as image 3 As stated, the degree of supercooling is 1.0°C, which is very small.

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Abstract

The invention discloses an inorganic-salt efficient coolant for refrigerated products. The inorganic-salt efficient coolant is prepared from the following raw materials by mass percent: 20% to 35% of main energy storage agent, 5% to 10% of nucleating agent and 1% to 5% of thickener. The main energy storage agent is an inorganic-salt mixture of ammonium bromide (NH4Br) and a cooling agent, i.e., ammonium chloride (NH4Cl). The nucleating agent is one of strontium chloride (SrCl2), magnesium sulfate (MgSO4), sodium metaphosphate (Na2P2O7.10H2O) and potassium sulfate (K2SO4). The thickener is xanthan gum, and the xanthan gum, serving as the thickener, has a remarkable effect on the phase separation of inorganic-salt phase-change cold storage materials. The inorganic-salt phase-change coolant provided by the invention has the advantages that the latent heat of phase change is about 280KJ / kg, the degree of supercooling is low, and the cycle stability is good. The phase change temperature of the coolant is -18 DEG C to -22 DEG C, thereby meeting the requirements of frozen foods and frozen drugs on temperature.

Description

technical field [0001] The invention relates to a high-efficiency inorganic salt cold storage agent for frozen products with a phase transition temperature of -18°C to -22°C, in particular to cold storage of frozen foods such as ice cream, quick-frozen dumplings / tangyuan, frozen pork, frozen seafood, and some frozen medicines. Chain transportation belongs to the technical field of cold storage agent. Background technique [0002] As a functional material in cold chain transportation, phase change cold storage materials are playing their role. Many countries have developed small packs of cold storage materials for the transportation of products in cold storage supply chains. However, the application of cryogens in food and medicine cryogenic freezing is relatively seldom. Therefore, the development of high-efficiency cold storage agents that meet the temperature requirements of frozen foods and pharmaceuticals, and the improvement of cold chain transportation of food and bio...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/066Y02E60/14
Inventor 卢立新戴君蔡莹
Owner JIANGNAN UNIV
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