Non-flooding remote air cooled condensers

摘要

The invention relates to an outdoor air cooled condenser for use in a refrigeration system and a method of controlling the condensing temperature in the condenser. The condenser may be used for one or several closed refrigeration circuits connected thereto. A condenser coil assembly is provided in the condenser and has a condenser coil and a heat transfer surface, the coil being connected to the refrigeration circuit. A housing houses the condenser and has an inlet and an outlet for the passage of air through the housing about the heat transfer surface. The outlet is divided in a primary outlet and a plurality of secondary outlets. A motor-driven fan is provided with each of the outlets. The primary outlet is provided with a controllable damper while the secondary outlets are provided with gravity-operated dampers. A sensor is provided for each refrigeration circuit and is are connected to the condenser coil outlet to sense a predetermined refrigerant condition and feed a signal to a control circuit which analyzes the signal with respect to an ideal condition set point value for the refrigeration system. The control circuit controls the damper of the primary outlet and the operation of the fans to control the amount of air passing through the housing and the condenser coil heat transfer surface in response to changes in the refrigerant condition resulting from heat rejection load changes in the condenser coil or entering air temperature changes in the housing to substantially maintain the refrigeration system operating at the ideal condition set point value.