Figure 1: A traditional assembled pump station (left) requires separate procurement and on-site installation of 5–7 independent devices. The AWA-Y integrated unit (right) completes hydraulic locking and joint commissioning before delivery, so it can operate after piping is connected on site.
Problem Definition: Three Recurring Engineering Problems in Cooling Systems for Small Factories
For small and medium-sized factories with heat rejection requirements in the range of 50–300 kW, such as a single medium-frequency furnace, a small injection molding unit, or a laser cutting machine, traditional cooling water systems usually use an "assembled" approach: separately purchasing a closed-circuit tower, circulating pump, water softener, chemical dosing device, expansion tank, and pressure gauge, then having an installation team assemble them on site. In real projects, this approach creates three recurring engineering problems.
Flow Decay Caused by Mismatch Between Circulating Pump and System Resistance
The head and flow of the circulating pump must be precisely matched with the inner-circuit resistance of the closed-circuit tower, the resistance of the plate heat exchanger, and the piping resistance. During on-site assembly, the equipment is often supplied by different vendors, and hydraulic parameters are frequently not calculated at system level. As a result, actual flow can deviate from the design value by 20–40%, heat exchange efficiency decreases, and equipment outlet water temperature exceeds the limit.
Multi-Node Leakage Risk from On-Site Piping Assembly
On-site assembled piping usually contains 20–40 pipe interfaces, and each interface is a potential leakage point. In a closed circuit, leakage not only increases makeup water volume, but also introduces air, accelerating cavitation and corrosion in the system.
Uncontrolled Commissioning Time Caused by Multi-Supplier Coordination
Commissioning an assembled system requires simultaneous coordination among the closed-circuit tower manufacturer, pump supplier, and water softener supplier. Commissioning typically takes 3–7 days, during which production equipment cannot operate normally.
Physical Principle: The Importance of Hydraulic Matching
The inner circuit of a closed-circuit cooling system is a sealed hydraulic loop. The operating point of the circulating pump, the intersection between the head-flow curve and the system resistance curve, determines actual operating flow.
Taking the AWA-30 inner circuit as an example:
- Plate heat exchanger resistance: about 3 m at a flow of 35 L/min
- Closed-circuit tower internal coil resistance: about 5 m
- Piping resistance, including elbows and valves: about 4 m
- Total system resistance: about 12 m
COOLTEK Solution: Integrated Design of AWA-Y
The AWA-Y integrated unit integrates the following equipment on the same base frame and completes hydraulic calculation, piping connection, and joint commissioning before delivery:
| Integrated Equipment | Specification (AWA-Y30 Example) | Function |
|---|---|---|
| AWA closed-circuit tower body | Heat rejection capacity 100 kW; inner-circuit flow 40 m³/h | Spray heat rejection in the outer circuit |
| Inner-circuit circulating pump | Head 15 m; flow 40 L/min; variable-frequency drive | Drives inner-circuit circulation and precisely matches system resistance |
| Water softener | Outlet hardness <50 mg/L; automatic regeneration cycle | Softens inner-circuit makeup water |
| Chemical dosing device | Metering pump; dosage 0–200 mg/L adjustable | Maintains stable inner-circuit water quality |
| Expansion tank | Volume 12 L; pre-charge pressure 0.3 MPa | Absorbs thermal expansion in the inner circuit; maintains stable system pressure |
| Control panel | Temperature, pressure, and flow display; high-temperature alarm | Monitors operating status |
Standards Verification: Applicable Scenarios and Selection Parameters
| Applicable Scenario | Heat Rejection Range | Recommended Model | Inner-Circuit Flow |
|---|---|---|---|
| Single medium-frequency furnace, 250–500 kW | 30–80 kW | AWA-Y15 / AWA-Y30 | 20–40 L/min |
| Laser cutting machine, 1–3 kW fiber laser | 5–15 kW | AWA-Y05 | 8–15 L/min |
| Injection molding machine, 100–300 tons | 20–60 kW | AWA-Y15 / AWA-Y30 | 15–35 L/min |
| Small pharmaceutical clean area, 2–5 devices | 50–150 kW | AWA-Y30 / AWA-Y60 | 35–70 L/min |
Extended Questions
- Does the control panel of AWA-Y support networking with a factory SCADA system or PLC? Which communication protocols are supported?
- If a factory has multiple devices requiring cooling, should it choose one large AWA-Y unit or multiple smaller AWA-Y units? What are the advantages and disadvantages of each approach?
- The water softener in AWA-Y consumes salt during regeneration. What is the approximate annual salt consumption?
