Zum wirkungsgrad von MHD-prozessen mit einspritz-kondensation

Thermodynamic cycles with multistage injection condensation, which have been suggested for the supply of fast flowing liquid to liquid metal MHD-generators, are subjected to a critical calculation. A mathematical treatment of the multistage process is developed, by which any path for the process can be calculated with steady functions. This gives the possibility of varying the type of process path as well as the start and end point of the process by aid of a computer in order to find the maximum possible efficiency. This maximum, η = 5·35 per cent, obtained from a whole of 36 different paths, is only slightly better than the efficiency of the single injection condenser. Assuming a conversion efficiency of the MHD-generator of 70 per cent, the over-all efficiency results to only about 3–5 per cent. The use of recuperative heat exchangers could be advantageous and should be theoretically treated in the future.