Steam condensing - liquid CO\(_2\) boiling heat transfer in a steam condenser for a new heat recovery system. (English) Zbl 1144.80341
Summary: In a new waste heat recovery system, waste heat is recovered from steam condensers through cooling by liquid CO\(_{2}\) instead of seawater, taking advantage of effective boiling heat transfer performance; the heat is subsequently used for local heat supply. The steam condensing - liquid CO\(_{2}\) boiling heat transfer performance in a steam condenser with a shell and a helical coil non-fin tube was studied both numerically and experimentally. A heat transfer numerical model was constructed from two models developed for steam condensation and for liquid CO\(_{2}\) boiling. Experiments were performed to verify the model at a steam pressure range of 3.2-5 kPa and a CO\(_{2}\) saturation pressure range of 5-6 MPa. Overall heat transfer coefficients obtained from the numerical model agree with the experimental data within \(\pm 5\)%. The numerical estimations show that the boiling local heat transfer coefficient reaches a maximum value of 26 kW/m\(^{2}\) K. This value is almost one order higher than that of a conventional water-cooled condenser.
MSC:
| 80A20 | Heat and mass transfer, heat flow (MSC2010) |
| 80-05 | Experimental work for problems pertaining to classical thermodynamics |
| 80A22 | Stefan problems, phase changes, etc. |
Keywords:
steam condenser; liquid CO\(_{2}\); boiling heat transfer; heat recovery system; waste heatReferences:
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