The Visualization Experiment In Supply Liquid Refrigerant For Evaporator By Gravity

Recycling neutral for the liquid cooling system to achieve ultra-times for the fluid to rely on imports of gas-liquid separator and the evaporator height difference. In the refrigeration system, the refrigerant in the evaporator in the mandatory fee Teng heat exchanger. Two-phase flow of refrigerant in the pipe at different flow pattern, affecting the refrigerant in the tube within the wetted perimeter of the evaporator heat transfer coefficient, thus affecting the performance of the refrigeration system.Direct expansion for the liquid cooling system with gravity for the liquid cooling system operating performance, the heat transfer performance of refrigerant flow state within the glass tube evaporator was contrast visualization.The experimental set up a set of gravity for the liquid cooling system with direct expansion for the liquid cooling system to switch test bed. Test of gravity for the liquid cooling system for the fluid height is 2350mm. The experimental visualization evaporator 16 glass tube at 0 ℃,-5 ℃,10℃,-15 ℃,-20 ℃ conditions, the direct expansion for the liquid cooling system and gravity for the fluid the refrigeration system is studied.It was found that the -20 ℃, the cooling capacity of the gravity for the liquid cooling system direct expansion for the liquid cooling system 41.7% higher gravity for the liquid cooling system cooling capacity expansion for the liquid cooling system at 0 ℃,6.3% higher. Gravity for the heat transfer coefficient of the liquid cooling system than direct expansion refrigeration system for the liquid. In the direct expansion refrigeration system for the liquid refrigerant in the evaporation tube of stratified flow, wavy stratified flow, annular flow, three flow patterns. Gravity for liquid cooling system, the refrigerant in the tube, four flow patterns of the bubble flo gas slug flow, gas bombs flow, stratified flow, wavy stratified flow.