In order to evaporate and concentrate the thermo-sensitive materials with properties of high viscosity

easy scaling and strong corrosion

a jacketed MVR (Mechanical Vapor Recompression) heat pump evaporation concentration system was designed. Water was used as the test medium for a series of experimental studies. Such parameters as temperature difference

compression ratio

evaporation capacity

coefficient of heat transfer

COP (Coefficient of Performance)

SMER (Specific Moisture Extraction Rate)

adiabatic efficiency and volumetric efficiency were influenced by operational and structural parameters like evaporating pressure

frequency of compressor and heat transfer area. The performance of the system when the compressor was running at afrequency of 50 Hz was much better than that under other conditions at a lower frequency. The most appropriate range of evaporating pressure was from 65 kPa to 85 kPa when a single evaporating kettle was running

and it was unnecessary to supplement external steam. Two evaporating kettles could be simultaneously used for industrial evaporation concentration by supplementing only a small quantity of external steam. Energy saving of both cases mentioned above was significant.