- Fully electric evaporators
- Our models with the lowest evaporation temperature, around 35 ºC
- Ideal for the recovery of raw materials and by-products
MODELS AND MAIN TECHNICAL FEATURES
We offer a wide range of heat pump evaporators and crystallizers.
Thanks to their low vacuum temperature, heat pump evaporators are designed for the evaporation of heat-sensitive and/or corrosive products, reducing the risk of thermal degradation of the product and deterioration of construction materials.
All our vacuum evaporators are manufactured with a high degree of customization to adapt to the needs and objectives of each client.
We manufacture four different models.
Technology: Heat pump (Freon R-513A)
Capacity (l/day): 250 to 18000
Power consumption per 1 m³ of distillate produced: 170 kWh/m³
Vacuum: ≈ 60 mbar
Evaporation temperature: ≈ 35°C
Technology: Heat Pump (Freon R-513A) / Forced Circulation (FC)
Capacity (l/day): 6720 to 52800
Electrical consumption per 1 m³ of distillate produced: 110 kWh/m³
Vacuum (1st/2nd Effect): ≈ 125/70 mbar
Evaporation temperature (1st/2nd Effect): ≈ 50/40 °C
Technology: Heat pump (Freon R-513A)
Capacity (l/day): 250 to 1000
Electrical consumption per 1 m³ of distillate produced: 270 kWh/m³
Vacuum: ≈ 60 mbar
Evaporation temperature: ≈ 35°C
Technology: Heat pump (Freon R-513A)
Capacity (l/day): 250 to 3500
Power consumption per 1 m³ of distillate produced: 220 kWh/m³
Vacuum: ≈ 60 mbar
Evaporation temperature: ≈ 35°C
WHICH HEAT PUMP EVAPORATOR BEST SUITS YOUR NEEDS?
This table will help you identify the most suitable model based on the composition of the wastewater, its tendency to form scale, the treatment capacity, and the required final concentrate.
| MODEL | CAPACITY | CONSUMPTION | APPLICATION | ADVANTAGES |
|---|---|---|---|---|
| ENVIDEST LT VS | 250–18.000 L/day | 170 kWh/m³ of distillate | Aqueous wastewater with a low pollutant load requiring concentration and water recovery in a compact system | Single-effect evaporation with an immersed coil heat exchanger. Combines a compact design with an operating temperature of approximately 35 °C. |
| ENVIDEST LT FC-2 | 6.720–52.800 L/day | 110 kWh/m³ of distillate | Larger wastewater volumes where energy efficiency and greater tolerance to scaling are prioritized | The double-effect configuration reuses heat between stages to reduce electricity consumption. Forced circulation accommodates somewhat more scaling-prone streams than designs with an immersed heat exchanger. Nominal operating temperatures: approximately 50/40 °C. |
| DESALT LT VR | 250–3.500 L/day | 220 kWh/m³ of distillate | Scaling-prone effluents requiring a high degree of concentration and salt crystallization | The internal motorized scraper helps control deposits on the heat-transfer surfaces during concentration and crystal formation. Operates at approximately 35 °C. |
| DESALT LT DRY | 250–1.000 L/day | 270 kWh/m³ of distillate | Smaller volumes where the objective is to obtain a solid or semi-solid residue | Designed to produce solid or semi-solid concentrates. An optional internal screw homogenizes the product and facilitates discharge. Operates at approximately 35 °C. |
Reference values published for operation with clean water under standard conditions. The actual flow rate, operating temperature, and energy consumption depend on the composition of the wastewater and the required final concentration.
Energy data should be assessed together with the treatment objective, as these models produce different types of concentrate.
MAIN OPERATIONAL ADVANTAGES
- They operate under vacuum at very low temperatures. This helps reduce the formation of scaling and fouling, thereby lowering the risk of corrosion.
- They are the ideal evaporators when the aim is to recover valuable products that are highly sensitive to high temperatures. Heat pump wastewater evaporators operate at exceptionally low temperatures, around 35 ºC, thereby protecting products that degrade rapidly as soon as the temperature rises.
- High energy efficiency (low kWh per m³ treated). They reuse the latent heat of condensation to evaporate new liquid. They primarily consume electricity to power the compressor.
- They operate entirely on electricity. They do not require boilers, steam lines, or thermal oil circuits. Simplified plant infrastructure, reduced maintenance of auxiliary equipment, and easier integration into existing facilities.
MAIN COMPONENTS OF EACH MODEL
The following video shows an Envidest LT VS heat pump vacuum evaporator. The video highlights all the main components and benefits of low-temperature heat pump evaporators.
OPERATION OF OUR HEAT PUMP EVAPORATORS
Vacuum generation and low-temperature boiling
The process begins by creating the necessary vacuum conditions inside the evaporation chamber.
By reducing the operating pressure, the boiling point of the effluent drops to approximately 35 °C. This generates water vapor without causing the thermal degradation of sensitive compounds.
Heat pump heating cycle
The heat required for evaporation is supplied by a closed-loop refrigeration cycle. The refrigerant gas is compressed, increasing its pressure and temperature.
The gas passes through a heat exchanger to transfer heat and maintain evaporation. The refrigerant then expands through an expansion valve, reducing its temperature and pressure.
Steam generation and continuous feeding
As heat is transferred to the effluent, the liquid begins to boil under vacuum, continuously generating water vapor.
The incoming effluent is preheated and fed into the evaporator to maintain constant operation.
Steam condensation and energy recovery
The vapor produced during evaporation is directed to a second heat exchanger. The refrigerant absorbs heat from the vapor, which condenses into distilled water.
The recovered distillate is extracted from the system, and the refrigerant, now heated, returns to the compressor to restart the cycle.
HEAT PUMP EVAPORATOR CONFIGURATIONS
We design and manufacture a wide range of heat pump evaporator and crystallizer models that can be designed in different configurations to adapt to the properties of the feed flow and the operating conditions of each process.
All our heat pump vacuum evaporators operate using electrical energy. Each model is designed to achieve different levels of concentration and dryness, treat streams with varying degrees of corrosiveness, and offer a wide range of solutions for varying wastewater volumes and compositions.
