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Yang J.,CAS Technical Institute of Physics and Chemistry | Yang J.,Beijing Key Laboratory of Thermal Science and Technology | Zhang C.,CAS Technical Institute of Physics and Chemistry | Zhang C.,Beijing Key Laboratory of Thermal Science and Technology | And 7 more authors.
Applied Thermal Engineering | Year: 2016

The mechanical vapor recompression (MVR) is a highly energy-efficient process, in which the compressor is the core unit. In order to improve the compressor efficiency the distilled water is atomized and injected into the compressor to cool down the overheated vapor during compression. The performances of the system with water injection compressor were tested and compared with a common compressor without water injection. Four groups of tests with different water spray rate were analyzed experimentally. The tests show that without water injection, the temperature difference increases sharply with frequency rising. It also shows that the values of compression ratio and evaporation capacity increase with the frequency increasing, and the values vary with the spray flow rate: the higher the flow rate, the larger the values. The values for the situations with water injection are closer to each other with the increas of the water spray rate while the situation without water injection is much lower. Specific moisture extraction rate, abbreviated as SMER is a parameter which reflects the removal water from the feed per kilowatt hour. With spray flow rate of 300 kg/h the SMER is 34 kg/kW h at frequency of 20 Hz while the value is 25 kg/kW h without water injection. © 2016 Elsevier Ltd. All rights reserved. Source

Liu J.,Xinjiang University | Liu J.,CAS Technical Institute of Physics and Chemistry | Liu J.,Beijing Key Laboratory of Thermal Science and Technology | Zhang C.,CAS Technical Institute of Physics and Chemistry | And 10 more authors.
Huagong Xuebao/CIESC Journal | Year: 2015

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. © All rights reserved. Source

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