Belmar Heat Pump Evaporators / Concentrators exploit the combined effect of vacuum and heat pump technology to obtain fluid distillation at low temperatures with an energy consumption of 160 kW/m3.

The boiling pressure in the chamber is set at 5-6 KPa (absolute), so that the boiling temperature of the water is around 35°C, much lower than that at atmospheric pressure.

This generates an excellent distillate quality, that can be reused back in the process or discharged to sewer without further treatment.

Heat Pump Evaporation Technology

The liquid to be concentrated is sucked into the evaporator chamber automatically under vacuum. The distillate circulation pump and ejector create a vacuum inside the evaporation chamber. The fluid compressor is operated to compress the refrigerant gas.  The compressed gas is then conveyed into the innovative immersed parallel plates heat exchanger. The heat generated is transferred to the process liquid, It releases almost all of the heat generated by the compression of the refrigerant gas, with the majority of the heat being released from the refrigerant gas circuit the remaining heat is lost through the fan air cooler. The refrigerant gas has released its heat to the liquid to be evaporated, and has lost the residual heat in the fan air-cooler. The gas is now directed into the condensate cooling chamber via expansion valve, where the refrigerant gas expands, and produces a cooling effect.

The water vapour generated in the evaporation chamber rises towards the cooling coil where the steam vapour condenses on contact with the cold surface of the cooling coil. From the bottom the condensation chamber the distillate is removed by the Venturi-tube (ejector) at and conveyed to the distillate storage. The recovered distillate overflows out of distillate storage to the external collection system for either reuse or discharge to drain. To maintain the desired concentration factor in the evaporator chamber it is necessary to purge liquid from the system. Concentrated liquid is released via time controlled valve and pump, there is no requirement to break the vacuum for this procedure. The evaporator can be run either on a continuous basis or as a batch process. The working cycle is fully automatic with critical safety interlocks.

Heat Pump Mono Effect Evaporator Operation

HP Double Effect version

The HP DE Double Effect series of vacuum evaporation and concentration systems are the evolution of the HP ME series and constitute the highest technological expression of heat pump energy efficiency.

The energy is supplied by a heat pump that uses a special refrigerant gas and utilizes the thermal energy of the evaporate produced in the first evaporative effect to heat the second evaporative effect free of charge.

This evolution allows electricity savings of 40% compared to the HP ME single effect series.

Also for this series, the construction in AISI 316L is foreseen, with the possible use of special materials for applications in corrosive environments to satisfy a wide range of applications.

Industry Applications

Machining Operations

Cutting oils, emulsions and washing effluents. Primarily a waste reduction technology to save on disposal costs.

Surface treatment

Phosphating, Chrome passivates. Concentration of rinses and spent baths. In combination with an ion exchange system process lines can literally run with zero  waste water to drain.


Recycling of rinse water, concentration of spent process solutions, recovery of precious metals.

Photo shops

Concentration of all aqueous wastes to save on disposal costs.

Chemical industries

Recycling of products through concentrating of rinse water produced from equipment cleaning.

IWE Heat Pump Vacuum Evaporator


Distillation throughput from 10 to 42 L/hour
Low temperature vacuum evaporator with heat pump, powered with electrical energy for semi-solid concentrates. Custom configured to obtain sludge, semi solid concentration and to concentrate fouling wastewater, saline water and high density waters. To be installed wherever an extremely strong concentration is required. Ideal to recycle valuable raw materials (metals and salts). Suitable for ZLD installation, food & beverage (electropolished version available on demand), chemical & pharmaceutical, cosmetic, plant extracts and flavourings, galvanizing, gold industry, mechanic industry, heat treatment (quenching and tempering), TREATMENT OF CONCENTRATE FROM EVAPORATORS/CONCENTRATOR. Detachable boiling vessel with large front and rear hatches with man access, external jacketed heat exchanger, large manways and sight glass with illuminator, built-in condensation section, full automatic operation with PLC and touch screen.

IWE HP DRY for salt production

IWE HP R with Scraper Screw


Material Options
  •  Standard construction in AISI 316 L stainless steel for less corrosive applications
  •  High Chloride Applications materials such as DUPLEX (SAF 2205), SUPER DUPLEX (SAF 2507)

Contact Belmar today to discuss your Waste Treatment & Recycling application!
We can provide laboratory testing, pilot plants
and full size industrial systems.