Overview
A catalogue heat exchanger only covers a limited range of duties. When air flow, medium or installation space falls outside that range, the unit either has excess surface, excessive pressure drop or will not fit. Custom design works the other way round: define the duty first, then derive the geometry and surface area.
Custom design is not an open-ended process. The boundary conditions have to be defined clearly. The more complete the parameters, the smaller the selection error and the closer the quotation is to the final price, which avoids repeated changes later.
Features
- One-to-one design from air flow, gas flow, temperature, pressure, medium and envelope
- Thermal and pressure-drop calculation before quotation
- Any of six fin types and mixed tube / fin materials
- Connection positions, casing and support built to the host equipment
- Pressure-bearing fabrication and inspection available
- Prototype and series supply
Parameters needed for a custom design
| Category | Parameters |
|---|---|
| Air side (heating / cooling) | Air flow, inlet and outlet air temperature, allowable pressure drop, dust and moisture content |
| Gas side (flue gas / process gas) | Gas flow, inlet and outlet temperature, composition analysis, dust loading, dew point |
| Fluid side (water / steam / thermal oil) | Medium, inlet and outlet temperature, flow, working pressure, allowable pressure drop |
| Structure and installation | Available space, duct connection positions, connection method, support and maintenance access |
| Material and inspection | Corrosion, cleanliness requirement, specified material, inspection standard and acceptance requirement |
| Project conditions | Quantity, delivery requirement, transport size limit, site installation support |
If some parameters are not fixed, we can prepare an estimate first. The quotation will be marked as an estimate and the final price confirmed after the parameters are fixed.
Custom design process
| Step | Content |
|---|---|
| 1 Requirements | Confirm medium, temperature, flow and installation boundary, and define the mandatory constraints |
| 2 Thermal selection | Calculate surface area, velocity and pressure drop; select fin type, materials and structure |
| 3 Proposal and quotation | Submit the technical proposal and itemised quotation, ex-works and including tax; freight is listed separately |
| 4 Fabrication and inspection | Manufacture to drawing and inspect to the agreed standard, with customer or third-party witness |
| 5 Delivery and acceptance | Pack and ship, provide inspection documents and site support where required |
Quotations are valid for 15 days. Estimate ranges: equipment ±15–25%, purchased components ±20–30%.