The present invention relates to a V-shaped heat exchanger for condensing exhaust steam from a turbine. The V-shaped heat exchanger comprises primary, secondary and tertiary single-row condensing tubes placed in a V-shaped geometry. A steam supply manifold supplies the exhaust steam to lower ends of the primary tubes and steam that is not condensed in the primary tubes is collected at upper ends of the primary tubes and transported to the secondary tubes using top connecting manifolds. Steam that is not condensed in the secondary tubes is further transported to the tertiary tubes using a bottom connection manifold. The tertiary tubes are coupled at their ends with an evacuation manifold for evacuating non-condensable gases.