The technology has been developed to work with a single tube or multi tubes inside one heat exchanger shell. Using a single drive motor multiple scraper, rods are rotated for use in a large scraped surface area.
Michael Adkins, marketing manager, HRS, told FoodProductionDaily the HRS-Rotex is a rotary scraped surface heat exchanger that brings new patent pending technology to the market and it focuses on viscous, difficult products in food processing.
“Traditional rotary scraped surface heat exchangers work on the principle of a tube in tube design and are limited in capacity,” he said.
“HRS has come up with a way to make the technology with a multi tube design. This means the capacity per module is increased, reducing capital investment.”
Adkins said HRS has sold a number of the machines to a large food producer in Spain which has taken a few of them on in various applications.
“They have been really pleased with the performance and space saving concept and we have a trial unit in Spain where we can trial customer’s products. We have had some good interest based on ‘word of mouth’,” he added.
“The patent is currently going through now and is being dealt with by the HRS Technical Centre in Southern Spain. As with most new products the launch was rather protracted. The idea was to launch at the turn of the year. However now is the time we are exposing the unit to a wider market.”
Challenging heat transfer apps
The HRS-Rotex series of heat exchangers has been developed for more challenging heat transfer applications. Each inner tube contains a scraper bar which rotates at high speed and is fitted with a helical screw, which enhances product flow and minimizes pressure drop.
The continuous scraping action allows mixing of viscous products whilst eliminating fouling on the inner tube wall, ensuring the heat transfer area is clean at all times.
Adkins said benefits compared to existing technology include a sealing system which enables the removal of individual tubes and increased turbulence.
Marcos Alarcon, chief designer at HRS Heat Exchanger said the HRS-Rotex complements its other scraped surface technology – the HRS Unicus.
HRS Unicus evaporates fouling liquids and large duty heat exchange applications with difficult fluids. But, for smaller duties involving high viscosities and fouling problems, the HRS-Rotex provides a better result towards efficient heat exchange.
HRS products and systems have been used in HVAC, food, chemical, pharmaceutical, water supply, energy recovery, waste to energy and environmental protection.
Its range of heat exchangers and associated products include corrugated tube shell and tube, scraped surface and plate heat exchangers, together with a hygienic piston pump and packages such as pasteurisers, CIP and food processing systems.
HRS also manufactures a patented self-cleaning scraped surface evaporator system for solids concentration.
The firm has offices in Spain, US, Peru, Malaysia and India as well as manufacturing and assembly plants in the UK, India, and Spain.