Heat Transfer System for Aggregates Drying

Our initial brief was simply to design & manufacture vertically orientated ‘custom’ coils with fans for an ORC cooling loop, to take the temperature of the water/glycol mix down from 50°C to 35°C.
On this basis, the engineering team produced a concept design which included 6 heat exchanger coils and fans.
An imperative for us however is ‘to understand’ the whole system into which our coils are to be incorporated.
Further probing with the customer during design review revealed the overall objective was to recover the heat from the cooling coils and duct it to a Trommel dryer to dry aggregate.

….but as this project was the customer’s first exposure to building such a system, it transpired that neither the ductwork design nor the associated pressure drop calculations had been carried out prior to the request for the cooling coil designs.
We were able to explain the beneficial significance of a whole system approach to the project.
The customer subsequently extended the brief from the initial requirement of cooling coils & fans to include the design & installation of the ductwork and re-specification of the fans to account for the pressure drop.
It was established that 6 runs of ductwork, each of different dimensions, and upgraded fans were required.

The customer welcomed, and was reassured by, the engineering team's style of engagement and 'whole system approach' to the project.
The end result included:
6 coils designed, delivered, and installed.
6 fans procured and installed.
6 ductwork runs designed, procured, and installed.
A Lifecycle Extension contract to ensure the on-going effective operation of the equipment.