The invention relates to an enthalpy exchanger for changing the enthalpy of a throughflow medium for the purpose of cooling process water coming from an industrial process by means of passing air, which enthalpy exchanger comprises: an air inlet; an enthalpy exchanger panel connecting thereto and configured to guide medium such that during operation this medium exchanges enthalpy with airflows let through by the or each air inlet; an air throughflow space connecting to the enthalpy exchanger panel; such that air can only flow into the air throughflow space via the air inlets and the enthalpy exchanger panels; a fan which connects to the air throughflow space and which draws in and blows out air via the air inlet, the enthalpy exchanger panel and the air throughflow space; and the ratio of the effective throughflow area of the fan and the total effective throughflow area of the relevant air inlets amounts to a maximum of about 0.3; added to the fan is a rotation-symmetrical airflow-guiding element which extend
