Energy Recovery Device for small to medium SWRO applications

  • Overview
  • Product range
  • Documents
  • Software
  • Related products
  • Case stories

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.

iSave ERD for reverse osmosis - Brochure - Danfoss

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

iSave selection tool - Danfoss

iSave selection tool

Download the iSave selection tool for easy calculation and selection. Calculate amount and size of iSaves for your project.

Follow our blog

Follow our blog

Danfoss is dedicated to engineering energy efficient solutions. Our blog explores issues related to energy and cost efficiency in seawater reverse osmosis.

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.

Highly energy efficient high-pressure pumps

With efficiency rates up to 92%, the APP pump technology offers the highest efficiency in the industry.

Product range

Documents

Documents
Type Name Language Valid for Updated Download File type
Data sheet iSave 21 Plus and iSave 40 Data sheet Spanish, Castilian Multiple 25 May, 2018 2.9 MB .pdf
Data sheet iSave 21 Plus and iSave 40 Data sheet English Multiple 24 May, 2018 2.9 MB .pdf
Data sheet iSave 21 Plus and iSave 40 Data sheet German Multiple 25 May, 2018 3.4 MB .pdf
Data sheet iSave 50 -70 Data sheet English Multiple 14 Apr, 2021 2.3 MB .pdf
Data sheet iSave 50 -70 Data sheet Spanish, Castilian Multiple 14 Apr, 2021 2.4 MB .pdf
Brochure Superior energy recovery in SWRO Spanish, Castilian Multiple 18 May, 2018 1.2 MB .pdf
Brochure Superior energy recovery in SWRO English Multiple 01 Jan, 2015 1.6 MB .pdf

Software

iSave selection tool - Danfoss

iSave selection tool

Download the iSave selection tool for easy calculation and selection. Calculate amount and size of iSaves for your project.

Related products

Case stories

  • if (isSmallPicture) { SUEZ Water Technologies } else if (isBigColumns) { SUEZ Water Technologies } else { SUEZ Water Technologies }
    Containerized SWRO unit retrofitted to save energy and maintenance

    Compact and energy efficient pump from Danfoss replaces obsolete centrifugal pump. After 20,000 hours no maintenance has been needed and energy costs are reduced by 20%.

  • if (isSmallPicture) { resort in the Maldives } else if (isBigColumns) { resort in the Maldives } else { resort in the Maldives }
    Danfoss supplies energy-efficient SWRO to a resort in the Maldives

    Compact, reliable and energy efficient pumps and ERDs from Danfoss are chosen as key components for SWRO plant producing fresh water for a multi-island resort complex in the Maldives.

  • if (isSmallPicture) { RO plant for new luxury hotel designed and installed in record time } else if (isBigColumns) { RO plant for new luxury hotel designed and installed in record time } else { RO plant for new luxury hotel designed and installed in record time }
    RO plant for new luxury hotel designed and installed in record time

    In addition to a fast design and installation, the customer's needs for energy efficient solutions were met by using pumps and energy recovery devices from Danfoss.

  • if (isSmallPicture) { Reduced energy costs with Danfoss APP pumps and iSave ERDs - HPP case study } else if (isBigColumns) { Reduced energy costs with Danfoss APP pumps and iSave ERDs - HPP case study } else { Reduced energy costs with Danfoss APP pumps and iSave ERDs - HPP case study }
    Reduced energy costs with Danfoss APP pumps and iSave ERDs

    A reduction of 57% on the energy consumption was achieved by retrofitting with Danfoss pump and iSave ERD.

  • if (isSmallPicture) { } else if (isBigColumns) { } else { }
    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.

  • if (isSmallPicture) { Seawater } else if (isBigColumns) { Seawater } else { Seawater }
    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.