Twenty years of making towers that stay on duty
A single works in Dezhou, Shandong — shell molding, steel fabrication, assembly and testing under one roof. That is why we can promise a delivery date and keep it.
A cooling tower factory, not a trading desk
ZHOUNENG started in 2003 as a small FRP workshop serving local HVAC contractors. Today the same site holds 26,000 m² of production space, four rotomolding lines, a steel fabrication shop and a test bay big enough to run a 500 m³/h tower under load before it ships.
We still sell direct. When you email us, an engineer reads it — not a sales assistant working from a catalogue PDF. That is the whole model, and it is why 40 % of our orders come from repeat buyers.
- Founded
- 2003
- Works area
- 26,000 m²
- Employees
- 180+
- Annual output
- 1,500 units
How the works grew
- 2003
The first workshop
Founded as an FRP parts supplier for local HVAC projects; first round tower shipped the same year.
- 2008
In-house molding
Installed the first rotomolding line — from this point every shell is made under our own roof.
- 2012
First export order
Two square crossflow towers shipped to a textile plant in Southeast Asia.
- 2016
CTI thermal testing
CTR series submitted to a CTI-accredited test facility; performance certified to STD-201.
- 2020
New plant
Moved into a 26,000 m² facility with a dedicated closed-circuit coil workshop.
- 2024
60 countries
Export installed base passes 60 countries across HVAC, power, chemical and food processing.
Six hold points, one test file
A cooling tower is a welded, molded, rotating machine that has to survive 20 years outdoors. We treat inspection as a production step, not a final gate — each hold point must be signed off before the next stage starts.
- Incoming resin, glass and steel certificates checked and filed by batch
- Shell wall thickness and gel-coat inspection after molding
- Hydrostatic test at 1.5× design pressure, 30-minute hold
- Fan dynamic balance and vibration check under load
- Dimensional inspection against the approved GA drawing
- Pre-shipment photo report with serial numbers
| Standard | Scope | Status |
|---|---|---|
| ISO 9001:2015 | Quality management system | Certified |
| CTI STD-201 | Thermal performance, CTR series | Certified |
| CE | Machinery directive, fan assemblies | Compliant |
| ASME Sec. VIII | Closed-circuit pressure coils | Optional |
| ISO 14001 | Environmental management | Certified |
Certificate numbers and expiry dates are available on request — we do not publish scanned copies on the website.
What we do in-house
Anything outsourced is something we cannot control. These four processes stay inside the fence.
FRP rotomolding
Shells up to 6.1 m diameter, 4 lines running two shifts.
Steel fabrication
Galvanized frames, basins and fan stacks, welded to WPS.
Assembly & run-in
Every unit assembled and run before packing.
Thermal selection
In-house selection software, signed by a thermal engineer.
Want to see the works?
We host customer inspections and third-party audits. Tell us your dates and we will arrange the factory visit and test witness.