1, According to user's specific requirements and engineering practice conditions, design and assemble all kinds R744 cascade refrigerating unit 2, Using two refrigerant: R744 and R404A 3, The cold room temperature is -30 degree, its cooling capacity is 150kW 4, It uses electronic expansion valve for liquid cooling 5, It has maintain unit and glycol defrosting and uses plate heat exchanger. Woodiness packaging fumigation.