3-in-1 energy recovery device
The 3-in-1 Energy Recovery Device (ERD) optimized for sea water reverse osmosis applications. With iSave you get pressure exchanger, booster pump and motor integrated into one compact unit for high efficiency and short pay-back time.
The small footprint of iSave makes it a popular solution when the space is limited. When fitted with iSave, the Danfoss APP pumps produce more fresh water per square meter than any other system in the market.
iSave can be used in almost any SWRO application – land-based or marine, new or retrofit. The 3-in-1 design allows fast commissioning, continuous monitoring of performance and easy regulation to accommodate seasonal changes. Other isobaric devices have been known to cause over-spin and over-flushing that lead to poor process control and low efficiency. This is avoided with the active control possibilities offered by the iSave technology.
iSave captures hydraulic energy from the high pressure reject stream of the SWRO process and transfers the energy back into the system, drastically reducing the energy consumption regardless of flow rate and size of your SWRO system. Besides substantial energy savings, the iSave ERD also cuts capital expenditure by reducing high-pressure pump size, number of pipes and components thanks to its integrated design.
Superior energy recovery in SWRO
Danfoss iSave is a patented, high-efficiency Energy Recovery Device (ERD) that guarantees constant membrane feed in SWRO applications of any size – on land, at sea or on the move.
Features and benefits
Extensive application know-how
Competitive efficiency rates
Compact – pressure exchanger, pump and motor in one unit
Easy and service-friendly design
Simple and reliable with high uptime
Short pay-back time
Wherever simplicity and space matter, iSave's 3-in-1 design makes energy recovery as easy as it is efficient.
iSave's unique design puts three key components of isobaric energy recovery exactly where they belong: right next to each other. So now engineers can configure RO systems that are simpler, smaller and easier to operate – not least in tight places like containers.
When installed with compact APP high-pressure pumps, the Danfoss pump-and-ERD package produces more fresh water per square meter than any other system on the market.
The importance of energy efficiency in the desalination process
Juan Manuel Ortega, renowned desalination expert, tells about the importance of using highly efficient energy recovery devices and high-pressure pumps.
Suez chooses oil-free Danfoss APP pump to power Bahamian RO plant retrofit
For a resort in Bahamas APP pump and iSave ERD were selected to supply fresh water. Both components are well-known for long service intervals, high reliability and energy efficiency. They eliminate risk of oil contamination on the plant site, as they use the pumped medium for lubrication.
Creating a sustainable future with seawater
Over the past decade, the use of Sea Water Reverse Osmosis (SWRO) for desalination has taken off. With proven efficiency rates up to 92% and energy savings of up to 65% compared to traditional solutions, the opportunities of SWRO technologies deserve further exploration.
Danfoss at the heart of new ultra-efficient RO plant that uses nothing but solar power without battery backup
Mascara NT chose Danfoss pumps and ERDs to drive an RO plant whose only energy source is the sun. Specially developed for some of the world’s most arid and isolated regions, the new OSMOSUN system is designed to produce water so efficiently that it does not need energy storage. By eliminating costly battery packs, Mascara NT’s solar powered plant radically reduces total life cycle costs and enables clean water in locations completely off the grid.