Abstract
In this paper 2 models are developed; the first one is for the horizontal falling film desalination process and the second one is for a modified combined thermal vapour compression and horizontal falling desalination process. The present models assume a constant heat transfer area in all effects rather than constant temperature drop between the effects. The computed results show that the rate of decrease of the specific heat transfer area of the horizontal falling film process is higher than that of the combined thermal vapour compression and the horizontal falling film process. The combined thermal vapour compression and the horizontal falling film presented in this paper gives values for the thermal performance ratio higher than the values obtained in the previous conventional combined thermal vapour compression and horizontal falling film desalination process.