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Basics of Industrial Heat Pumps 3-39 Heat pump technology 3.2.3 Mechanical vapour recompression (MVR) Mechanical vapour recompression is the technique of increasing the pressure and thus also the temperature of waste gases, thereby allowing their heat to be re-used. The most common type of vapour compressed by MVR is steam, to which the figures below refer. There are several possible system configurations. The most common is a semi- open type in which the vapour is compressed directly (also referred to as a direct sys- tem). After compression, the vapour condenses in a heat exchanger where heat is deliv- ered to the heat sink. This type of MVR system is very common in evaporation applica- tions Compressor Condensation Recirculated product Fan Water vapor 97% Vaccum 200 mbar Evaporation Vacuum pump Storage tank Product 100% Concentrated Figure 3-5: Mechanical vapor recompression [Bédard, 2002] The other type of semi-open system lacks the condenser, but is equipped with an evapo- rator. This less usual configuration can be used to vaporize a process flow that is re- quired at a higher temperature, with the aid of mechanical work and a heat source of lower temperature. 3.2.4 Thermal vapour recompression (TVR) With the TVR type of system, heat pumping is achieved with the aid of an ejector and high pressure vapour. It is therefore often simply called an ejector. The principle is shown in the figure below. Unlike MVR system, a TVR heat pump is driven by heat, not mechanical energy. Thus, compared to an MVR system, it opens up new application areas, especially in situations where there is a large difference between fuel and elec- tricity prices. product 3% PreheatingPDF Image | Industrial Heat Pumps
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