一、核心作用
注塑机运行时，液压系统和模具产生的热量若不及时散除，会导致设备精度下降、产品缺陷。冷却塔通过热交换为液压系统提供20-35℃冷却水，维持设备稳定；同时配合Water Chiller组预降温，降低机组负载与能耗。
二、选型关键参数
（一）热负荷与冷却水量
单台设备热负荷按Power估算（每千瓦每小时产热约860千卡，结合0.7-0.8的热效率），多台设备汇总后预留10%-15%余量。冷却水量可通过公式计算（水量=总热负荷÷设计温差，设计温差取5-8℃），或按Water Chiller组冷凝水Flow Rate的120%-125%匹配。
（二）Temperature与结构类型
按进水Temperature分为标准型（37℃进、32℃出）、中温型（43℃进、33℃出）、高温型（>60℃进、35℃出）；按水质要求选择开式塔（成本低、易污染）或闭式塔（防污染、维护少、成本高20%-30%）。
（三）环境适配
湿热地区需增加15%-20%冷却能力；空间有限选逆流式，屋顶安装选横流式；敏感区域选Noise<60dB的低Noise塔；腐蚀环境用玻璃钢塔体与PVC/PP填料。
三、选型流程
1. 工况调研：统计设备参数、水温现状，测量安装空间与通风条件；
2. 参数计算：确定冷却水量与塔型；
3. 系统匹配：Water PumpFlow Rate匹配塔处理量，开式塔配加药与过滤装置；
4. 供应商比选：对比方案参数、核心部件与行业案例；
5. 运行验证：实测出水Temperature与能耗，必要时优化。
四、误区规避
避免凭设备吨位选型，应以实际工况为准；强调整体系统协同，避免单一设备选型；权衡全周期成本，综合评估初始投资与长期维护费用。
五、案例参考
浙江某车间8台200吨注塑机，总Power296kW，选33m³/h逆流式玻璃钢开塔，配自动加药装置，实际出水32℃，能耗降20%，设备停机归零。
Written by: Zhongliang Yiji Technical Department · 15 Years of Cooling Tower Selection Experience | Last Updated：2026-10-17
FAQ
How to choose between a closed-circuit and an open cooling tower?
For working conditions that demand clean water (such as vacuum furnaces, high-frequency furnaces, and injection machine hydraulic oil cooling), a closed-circuit tower is preferred: the cooled medium circulates inside the coil without direct contact with air, so it resists scaling, algae and particle contamination, with stable heat transfer and low maintenance. For ordinary recirculating water scenarios with tight water budgets or cost sensitivity, an open tower costs less upfront but requires supporting water treatment.
What are the footprint and connections of a 100 t closed-circuit cooling tower?
Taking a standard 100 m3/h closed-circuit tower as an example: overall dimensions are approximately 3500 x 1500 x 2800 mm with a footprint of about 5.25 m2; inlet and outlet piping is typically DN100, with a 5-10 C temperature drop under standard conditions. Refer to the product specification table for details; non-standard dimensions can be customised on site.
How do I size the pump and head for a cooling tower?
Pump flow is selected according to the rated circulating water volume of the cooling tower; head must account for pipeline friction losses, local resistance, equipment elevation difference and the necessary margin. Pressure-bearing equipment such as injection machines also requires reserve for the working pressure. It is recommended to hand the operating data (flow, temperature difference, installation height, pipe diameter and length) to technical staff for calculation, to avoid an undersized pump or excessive head that wastes energy.
What water treatment does a closed-circuit cooling tower need?
The outer circulating water of a closed-circuit tower still contacts air, so softened make-up water, periodic corrosion and scale inhibitor dosing, and control of the concentration ratio are recommended. The inner circulating medium should be softened water, antifreeze or pure water according to process requirements; outdoor installation in winter requires freeze protection (electric tracing or draining).
