In the current new energy vehicle battery test equipment, the use of more batteries to test the chiller evaporation temperature has a certain impact on the equipment, then what is the specific impact?
When the battery test chiller
heat load increases, other conditions remain unchanged, the evaporation temperature will rise, the low pressure will also increase, and the superheat of the suction will increase. In this case, the battery test chiller can only open a large expansion valve to increase the circulation of the refrigerant, and can not close the expansion valve due to the increase of the low pressure, reducing the low pressure. Battery test chillers do this to make the suction superheat more, the exhaust temperature rise, and the operating conditions worse. When adjusting the battery test chiller expansion valve, the amount of adjustment should not be too large. After the adjustment, it must be operated for a certain period of time to reflect whether the heat load and the cooling capacity are balanced.
The battery tests the influence of the change of the energy of the chiller compressor on the evaporation temperature. When the energy of the refrigeration compressor is increased, the suction amount of the compressor increases accordingly. Under other conditions, the high pressure rises. As the low pressure is reduced, the evaporation temperature will also decrease. Battery test chiller In order to continue to maintain the evaporation temperature required by the production process, a large expansion valve is required to raise the low pressure to a specified range.
Battery test The heat transfer area of the chiller mainly refers to the evaporation area of the evaporator. The change of the heat transfer area mainly refers to the change of the evaporation area. In a complete refrigeration unit, the evaporation area is usually fixed, but in actual operation, the evaporation area is constantly changing due to insufficient liquid supply or oil accumulation in the evaporator. The influence of the increase and decrease of the evaporation area on the evaporation temperature and the increase and decrease of the heat load on the evaporation temperature are basically similar. As the evaporation area increases, the evaporation temperature increases, and as the evaporation area decreases, the evaporation temperature decreases. In order to maintain the required temperature, the energy and expansion valves should be adjusted and the evaporator should be drained to maintain a relative balance between heat transfer area and cooling capacity.
When the battery test chiller refrigerant flow rate is constant, the lower the evaporation temperature, the greater the temperature difference with the heat load (hot air), the larger the cooling capacity, in other words, the lower the evaporation pressure, the larger the cooling capacity, and the same quality The same refrigerant evaporates at different temperatures, and its latent heat of vaporization is also different. The lower the evaporation temperature, the greater the latent heat of evaporation and the stronger the heat absorption capacity.
Battery test chiller evaporation temperature and the operation of many components are closely related, users need to pay attention to when running the new energy vehicle battery test system.