Electric Vehicle Battery Test System

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The defrosting of the evaporator of the electric vehicle battery test can also cause the evaporating temperature of the electric vehicle battery to be too low, because the evaporator coil frosting makes the heat transfer coefficient smaller, the thermal resistance increases, the heat transfer effect is reduced, and the refrigerant evaporates. The amount is reduced, and when the compressor energy is constant, the evaporation pressure of the system is lowered, and the corresponding evaporation temperature is lowered, so the defrosting is timely.

Electric vehicle battery test evaporation temperature is too low may be that the oil in the evaporator will form an oil film on the wall of the evaporation coil, which will also reduce the heat transfer coefficient, increase the thermal resistance, reduce the heat transfer effect, the refrigerant The evaporation amount is reduced, the evaporation pressure of the system is lowered, and the corresponding evaporation temperature is lowered. Therefore, it is necessary to discharge the oil in time, and the hot ammonia is used to bring out the lubricating oil in the evaporator. The electric vehicle battery test expansion valve is too small to open, the system supply amount is small, and the evaporation pressure is reduced when the compressor energy is constant, which causes the evaporation temperature to decrease, so the expansion valve opening degree should be increased.