Performance Research Of The Heat Interchanger For The Enclosed Eutectic Salt Concentric Jacketed Phase Change Materials For Cooling Storage

At present, our country's electricity growth is still unable to meet the rapid development of the national economy and people's living needs of rapidly growing electricity. Power shortage situation in the country have not been a fundamental change in. In this case, the peak and valley price policy implementation for the cooling storage air conditioning technology provides a broad development prospects. Therefore, research cooling storage of air conditioning technology has been an important way to save energy nowadays. However, the current study is the largest water storage and ice storage, for the study of eutectic salt storage still less. Its main advantage is its relatively high phase transition temperature, ice storage can be overcome weakness of low evaporation temperature, and can use the normal air-conditioning chillers. This article is on the eutectic salt storage and release characteristics of the cold.We concluded that the Na₂SO₄·10H₂O solution freezing point is increased, along with the Na₂SO₄·10H₂O mass fraction increased. The NH₄Cl has an decreased affect on Na₂SO₄·10H₂O solution freezing point, and this function for precisely control of the eutectic salt solution's freezing point, in order to meet the cooling system requirements, improve the chiller COP has an important significance. With the comprehensive comparison, the experimental use the Na₂SO₄·10H₂O, and in order to reach the more satisfactory performance results in all the aspects , we add some additives: Na₂SO₄ as storage material, 2.6% of borax as nucleating agent, 6.66% NaCl and 6.16% NH₄Cl eutectic salt in order to reduce the condensation point, the other is water. The crystallization temperature is 5 8℃。Design the concentric tube thermal storage unit , study its storage and release of cold properties, the result shows that the concentric tube unit has a good characteristics on cold storage and release. In view of this characteristics, it can be connected with the experiment. A experimental systems was set up, the effects of the cold storage and release characteristics have been studied. The results show that: The inlet temperature of refrigerant,when entering the ice storage tank, has an larger influence on the process of cool storage than the Flow amount o the cooling medium. It is found by analyzing the process of experiment about storage that the suitable outlet temperature of the cooling medium is 1℃while the flow amount of the cooling medium is 0.247 m³/h, and the suitable temperature of inlet is 10℃while the flow amount of the cooling medium is 0.235m³/h.