The DTR series of double tube heat exchangers from HRS Heat Exchangers is designed to maximize direct (product-to-product) energy recovery from low viscosity materials such as wastewater, sewage, effluents and sludge.
The DTR exchangers are said to allow valuable heat to be recaptured before the effluent enters final treatment or is discharged to the environment.
The tube-in-tube design means that the series copes well with fluids that contain particles, the company says, without the worry of blockages impeding the flow of product or heating medium.
Special stainless steel corrugated tubes are used to increase heat transfer and reduce fouling, making the series more efficient than similar smooth tube heat exchanger designs.
The inner tube of the series is removable for inspection, cleaning and maintenance, meaning that both the tube and shell sides can be inspected and cleaned, while the corrugated tube technology is said to improve heat transfer, yet reduce potential fouling compared to standard smooth tube heat exchangers.
For large installations, multiple units can be interconnected and mounted in a frame, and a range of options, including thermal insulation and cladding in materials including stainless steel are available.