Analytical solution and experimental measurements for temperature distribution prediction of three-phase direct-contact condenser

• We measure and model the temperatures distribution of 3-phase DCC (Direct contact condensers).
• Vapour pentane and water as dispersed and continuous phase are used.
• Heat transfer coefficient and bubbles relative velocity are derived implicitly.
• Temperature of continuous phase is increased with increasing distance.
• Flow rate ratio is dominated and Initial vapour temperature is slightly affected.

An experimental and analytical investigation for the temperature distribution prediction of a three-phase bubble-type direct-contact condenser conducted, using a short Perspex column with 4 cm internal diameter and 70 cm height as a direct contact condenser. Vapour pentane and water were exploited as dispersed phase and continuous phase respectively. The effect of mass flow rate ratio (43.69%, 22.97%, 12.23%, 8.61% and 6.46%) and initial dispersed phase temperature (37.6 °C, 38.4 °C and 41.7 °C) on the direct contact condenser output were studied. Linear temperature distributions along direct contact condensers were found experimentally, except at mass flow rate ratio 43.69% and with less magnitude at 22.97%, for different initial vapour temperatures, while theoretically this behaviour is purely linear. The results showed that the mass flow rate ratio and the hold up have a dominant effect on the direct contact condenser output. On the other hand, the initial vapour temperature had a slight effect on the direct contact condenser output temperature which indicates that the latent heat is controlled in the exchange process. The analytical model is based on the one-dimensional mass and energy equations. New expressions for average heat transfer coefficient and two-phase bubbles relative velocity are derived implicitly. Furthermore, the model correlated very well against experimental data obtained.