A heat transfer system includes first (62) and second (64) electrocaloric module with aligned first and second sides. First and second prime movers (80,82) are arranged to direct a working fluid in opposite directions along flow paths through the electrocaloric modules. A rotary fluid control device (92,98) including a plurality of openings (94,96,100,102) is disposed around the electrocaloric modules, and is configured to rotate between positions relative to the modules. In a first position, the first module is in operative fluid communication through the openings with the first prime mover, and the second module is in operative fluid communication through the openings with the second prime mover. In a second position, the first module is in operative fluid communication through the openings with the second prime mover, and the second module is in operative fluid communication through the openings with the first prime mover.