By Hans Ludwig Von Cube

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7 VAPOUR JET HEAT PUMPS In the vapour jet heat pump, the kinetic energy of a vapour jet, produced by heat input, is utilised for compressing the refrigerant vapour. In principle, this is a compression process which is, however, operated without input of mechanical energy. 24. In the injection nozzle, the drive vapour at pressure px is expanded, and a vapour jet with a velocity several times the velocity of sound is produced. This carries forward the expansion vapour at pressure p0 and accelerates it.

In thermodynamic terms, the definition of a 'heat ratio' analogous to the absorption heat pump would be logical using the enthalpy Hmix of the vapour mixture and the enthalpy HdT of the drive vapour. Because the evaporation enthalpy is very high for water at about 2000 kJ/kg, the process is mostly carried out with water vapour. But, for process technical reasons, other media are also used. 1 THERMOELECTRIC HEAT PUMPS Principles If a direct voltage is applied to a junction of two different electrical conductors so that an electric current flows, the joint is cooled or heated, depending on the direction in which the current flows.

Of a thermal power station in order to obtain a value which can be compared with the heat ratio f of the absorption plant. Only when both processes are driven 40 Thermodynamic principles by the same form of energy is direct comparison possible. Cr = l/Tm or In this way, the Carnot heat ratio can easily be determined as the ratio of two lines in the log p, 1 jT graph. As these equations show, the heat ratio f h becomes more favourable with higher generator temperature Tgenand with lower condensing and absorption temperature Tm .

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